A splicing tape (200) comprises a splicing portion (1,2) and an attachment portion (42,48), said attachment portion (42, 48) being provided for releasably and self-supportively attaching said splicing tape (200) substantially across the width of a roll of sheet material. A first adhesive layer (2) is provided on a backing (1) extending from one longitudinal edge of the backing (1) across the tape to a first position towards the center of the backing (1), said first adhesive layer (2) being provided for attaching the leading edge of the roll to the splicing tape (200). A second adhesive layer (2) is provided on the backing (1) beginning at or beyond, but not overlapping the first position and extending towards the second longitudinal edge of the backing (1). The second adhesive layer is for attachment to a further sheet material. The attachment portion (42,48) includes a third adhesive layer adapted to release the leading edge and splicing portion (1,2) from the underlying sheet material leaving a non-tacky outer surface of the underlying sheet material. The splice can be completed by attaching a further sheet material to the splicing portion (1,2). The third adhesive layer may be provided by a weakly adhering or stretch release adhesive layer. The invention may be adapted to produce overlap, in particular staggered overlap splices.
According to the invention, methods of making permanent or flying splices are provided.
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21. A splicing tape for splicing the leading edge of a roll of sheet material to a further sheet material, each winding of said sheet material on said roll having an outer surface facing radially outwards away from said roll, comprising:
a splicing portion and a pre-formed attachment portion, said splicing portion comprising: an elongate backing member; an adhesive layer on said backing member, a first part layer of said adhesive layer being provided for attachment of the leading edge of the roll of sheet material substantially across the width of said roll to said backing member and a second part layer of said adhesive layer being for attachment to said further sheet material; wherein said pre-formed attachment portion is connected to and distributed along said splicing portion for releasable and self-supportive attachment of said splicing tape to the outer surface of the underlying winding of said roll of sheet material substantially across the width of said roll, characterized by said attachment portion being adapted for releasing at least said splicing portion from said underlying winding of said roll while leaving the outer surface of said underlying winding in a non-tacky condition and said attachment portion includes a stretch releasable adhesive layer.
1. A splicing tape for splicing the leading edge of a roll of sheet material to a further sheet material, each winding of said sheet material on said roll having an outer surface facing radially outwards away from said roll; comprising:
a splicing portion and a pre-formed attachment portion, said splicing portion including: an elongate backing member having two faces and two longitudinal edges; a first adhesive layer on a first face of said backing member for attachment of the leading edge of the roll substantially across the width of said roll to said backing member, said first adhesive layer extending across the width of said backing member from substantially the first longitudinal edge of said backing member to a first portion towards the centre thereof; and a second adhesive layer on a said first face of said backing member for attachment of said backing member to said further sheet material, said second adhesive layer beginning at or beyond, but not overlapping with said first position and extending across the width of said backing member to a second position towards the second longitudinal edge of said backing member; wherein said pre-formed attachment portion is connected to and distributed along said splicing portion for releasable and self-supportive attachment of said splicing tape to the outer surface of the underlying winding of said roll substantially across the width of said roll, characterized by said pre-formed attachment portion including a third adhesive layer on a second face of said backing member for releasing at least said splicing portion from said underlying winding of said roll while leaving the outer surface of said underlying winding in a non-tacky condition.
10. A splice on the leading edge of a roll of sheet material for attachment to a further sheet material, each winding of said sheet material on said roll having an outer surface facing radially outwards away from said roll, comprising:
a splicing portion and a preformed attachment portion, said splicing portion comprising: an elongate backing member having two faces and two longitudinal edges; a first adhesive layer on a first face of said backing member attaching the leading edge of the roll of sheet material substantially across the width of said roll to said backing member, said first adhesive layer extending across the width of said backing member from substantially the first longitudinal edge of said backing member to a first position towards the centre thereof; and a second adhesive layer on a said first face of said backing member for attachment to said further sheet material, said second adhesive layer beginning at or beyond, but not overlapping with said first position and extending across the width of said backing member to a second position towards the second longitudinal edge of said backing member; wherein said pre-formed attachment portion is connected to and distributed along said splicing portion and releasably and self-supportively attaching said splice to the outer surface of said underlying winding of said roll of sheet material substantially across the width of said roll, characterized by said pre-formed attachment portion including a third adhesive layer on a second face of said backing member for releasing at least said splicing portion from said underlying winding of said first roll while leaving the outer surface of said underlying winding in a non-tacky condition.
19. A method of preparing a splice between the leading edge of a roll of sheet material and a further sheet material using a splicing tape, each winding of said sheet material on said roll having an outer surface facing radially outwards away from said roll, said splicing tape comprising:
a splicing portion and a pre-formed attachment portion, said splicing portion comprising: an elongate backing member having two faces and two longitudinal edges, a first adhesive layer on a first face of said backing member, said first adhesive layer being provided for attaching the leading edge of said roll of sheet material substantially across the width of said roll to said splicing tape and extending across the width of said backing member from substantially the first longitudinal edge of the backing member to a first position towards the centre thereof; and a second adhesive layer on a said first face of said backing member and being covered by at least one release foil, said second adhesive layer being provided for attachment to said further sheet material, said second adhesive layer beginning at or beyond, but not overlapping said first position and extending across the width of said backing member to a second position towards the second longitudinal edge of said backing member; wherein said pre-formed attachment portion is connected to and distributed along said splicing portion for self-supportively and releasably attaching said splicing tape to the outer surface of the underlying winding of said roll of sheet material substantially across the width of said roll, said attachment portion including a third adhesive layer on a second face of said backing member for releasing at least said splicing portion from the underlying winding of said roll while leaving the outer surface of the underlying winding in a non-tacky condition, said method comprising the steps of: attaching said splicing tape to the outer surface of said underlying winding using said third adhesive layer on said backing member substantially across the width of said roll; attaching said leading edge to said first adhesive layer, and separating said attachment portion from said splicing portion attached to said leading edge while leaving the outer surface of said underlying winding in a non-tacky condition.
20. A method of making a splice between the leading edge of a roll of sheet material and a further sheet material using a splicing tape, each winding of said sheet material on said roll having an outer surface facing radially outwards away from said roll, said splicing tape comprising:
a splicing portion and a pre-formed attachment portion, said splicing portion comprising: an elongate backing member having two faces and two longitudinal edges; a first adhesive layer on a first face of said backing member, said first adhesive layer being provided for attachment of the leading edges of the roll of sheet material substantially across the width of said roll to said splicing tape and extending across the width of said backing member from substantially the first longitudinal edge of the backing member to a first position towards the centre thereof; and a second adhesive layer on a said first face of said backing member and being covered by at lease least one release foil, said second adhesive layer being provided for attachment of said backing member to the further sheet material, said second adhesive layer beginning at or beyond, but not overlapping with said first position and extending across the width of said backing member to a second position towards the second longitudinal edge of said backing member; wherein said pre-formed attachment portion is connected to and distributed along said splicing portion for self-supportively and releasably attaching said splicing tape to the outer surface of the underlying winding of said roll of sheet material substantially across the width of said roll; said attachment portion including a third adhesive layer on a second face of said backing member for releasing at least said splicing portion from said underlying winding of said roll while leaving the outer surface of the underlying winding in a non-tacky condition, said method comprising the steps of: attaching said spliced tape to the outer surface of said underlying winding using said third adhesive layer on said backing substantially across the width of said roll, attaching said leading edge to said first adhesive layer, exposing said second adhesive layer, attaching the further sheet material to the exposed second adhesive layer, and releasing said leading edge and said splicing portion attached thereto from said underlying winding while leaving the outer surface of said underlying winding non-tacky.
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The present invention relates to permanent or flying splices between sheet materials of the butt, overlap and in particular staggered overlap kind, a splicing tape for use in producing such splices and methods of using the splicing tape in producing butt, and overlap, particularly staggered overlap splices.
In this application and merely for clarity purposes, the leading end and edge of sheet material on a roll is considered to be the last quadrant of sheet material exposed on the outside of the roll, i.e. the section 32 of sheet material shown in
Two common types of splice are known for webs of sheet materials. Firstly, there is a permanent splice for joining the leading edge of one roll or part roll to the trailing edge of a further roll or part roll. The permanent splice should provide a flexible strong connection between the two webs and should maintain substantially all of the properties of the sheet material, for example if the sheet material is paper which can be printed or coated, the permanent splice is preferably, thin, flexible, printable, coatable and should also have the same repulpable properties as paper. Conventional splicing tapes and splices do not generally meet all of these requirements. Further, when joining part rolls the second roll is normally wound back onto the first roll in order to produce a complete roll and the permanent splice is then located somewhere in the middle of the new larger roll. This splice is subject to high pressures caused by the winding tension and it is important that no adhesive materials are present either on or near the splice or bleed out of the splice during storage which could adhere layers of sheet material together or damage or obstruct printing machinery.
A typical permanent butt splice is shown in FIG. 1A. Such a splice can be manufactured using a splice tape as shown in FIG. 13 and described in WO 90/08032.
A permanent overlap splice is also known as is shown in FIG. 1B and is known in a modified form from WO 93/12025. Here the leading and trailing edges 3 and 4 of the first and second rolls are joined together by a double sided tape of the kind shown in FIG. 14. With reference to
This type of splice has a disadvantage that there is a considerable step at the change from the sheet material 3 or 4 and the splice itself when compared with the butt splice shown in FIG. 1A. This step can disrupt the printing process. Further, there is the possibility of the adhesive bleeding out of the splice or bleeding through the paper if placed under pressure. Additionally, the webs of sheet material may move relative to each other when tension in the web puts the splice in shear. If movement occurs during multiple pass printing the alignment in successive printing stages is disturbed resulting in inferior quality. Any relative movement is likely to release adhesive with the serious consequences mentioned above. To prevent this movement an additional adhesive tape 6' is sometimes applied along the edge of the splice as shown in FIG. 1B. This improves the strength of the splice but increases its thickness still further.
Since a paper manufacturer is often held liable by the printer for damage caused by the splice it is desirable to provide a reliable splicing method and splice which does not affect the printing process. In particular a sheet surface with exposed aggressively tacky adhesive is considered not to be machine printable.
In order to reduce the step at the splice, a staggered overlap splice as shown in
Splicing can also become necessary when insufficient sheet material is left on one drum. Webs from two drums must be attached together.
Flying splices are usually temporary splices made at machine running speeds between rolls when it is undesirable to stop the machine, e.g. during coating or printing. The surface speed of the roll can be 1000 or even 2000 meters per second. Conventional way of making a flying splice can be understood from
The final splice appears as in FIG. 2B. The leading edge 3 of the new roll is attached to the trailing edge 4 of the old roll by means of the double sided tape 1, 2A, 2B and the excess of the trailing edge left after cutting is indicated by 8.
It is possible to make a flying butt splice with a butt splicing tape of the kind shown in FIG. 13. The final splice is shown in
Although the low step profile of the butt splice would be preferred for both permanent and the flying splices, several disadvantages with the application of the tape have resulted in this tape not being widely used for either permanent or flying splices. Firstly, a tape of the kind shown in
In DE-A-4033900, a modified flying butt splicing tape is proposed. This splice tape, therefore, leaves an exposed surface of adhesive on the underlying winding of the first roll at a distance of approximately one circumference of this roll from the actual splice. This exposed adhesive layer is capable of picking up sheet remnants or attaching itself to other objects or parts of the machinery which can disrupt smooth operation, in particular machine printing. Further, some of the materials used to make the splice could be environmentally improved. A further disadvantage is that after positioning on the roll the splicing tape is not repositionable.
None of the above mentioned conventional splicing tapes provide a low profile tape with the facility to releasably attach the tape to the underlying winding while leaving the undelying winding non-tacky when the splice is complete.
The present invention provides a splicing tape for splicing the leading edge of a roll of sheet material to a further sheet material, each winding of said sheet material on said roll having an outer surface facing radially outwards away from said roll; comprising:
a splicing portion and a pre-formed attachment portion, said splicing portion including:
an elongate backing member having two faces and two longitudinal edges;
a first adhesive layer on said backing member for attachment of the leading edge of the roll substantially across the width of said roll to said backing member, said first adhesive layer extending across the width of said backing member from substantially the first longitudinal edge of said backing member to a first position towards the centre thereof; and
a second adhesive layer on a first face of said backing member for attachment of said backing member to said further sheet material, said second adhesive layer beginning at or beyond, but not overlapping with said first position and extending across the width of said backing member to a second position towards the second longitudinal edge of said backing member;
wherein said pre-formed attachment portion is connected to and distributed along said splicing portion for releasable and self-supportive attachment of said splicing tape to the outer surface of the underlying winding of said roll substantially across the width of said roll, said attachment portion including a third adhesive layer on said backing member for releasing at least said splicing portion from said underlying winding of said roll while leaving the outer surface of said underlying winding in a non-tacky condition.
Further the invention provides a splice on the leading edge of a roll of sheet material for attachment to a further sheet material, each winding of said sheet material on said roll having an outer surface facing radially outwards from said roll, comprising:
a splicing portion and a pre-formed attachment portion, said splicing portion comprising:
an elongate backing member having two faces and two longitudinal edges;
a first adhesive layer on said backing member attaching the leading edge of the roll of sheet material substantially across the width of said roll to said backing member, said first adhesive layer extending across the width of said backing member from substantially the first longitudinal edge of said backing member to a first position towards the centre thereof; and
a second adhesive layer on a first face of said backing member for attachment to said further sheet material, said second adhesive layer beginning at or beyond, but not overlapping with said first position and extending across the width of said backing member to a second position towards the second longitudinal edge of said backing member;
wherein said pre-formed attachment portion is connected to and distributed along said splicing portion and releasably and self-supportively attaching said splicing tape to the outer surface of said underlying winding of said roll of sheet material substantially across the width of said roll, said attachment portion including a third adhesive layer on said backing member for releasing at least said splicing portion from said underlying winding of said first roll while leaving the outer surface of said underlying winding in a non-tacky condition.
In addition the invention provides a method for preparing a splice between the leading edge of a roll of sheet material and a further sheet material using a splicing tape, each winding of said sheet material on said roll having an outer surface facing radially outwards away from said roll, said splicing tape comprising:
a splicing portion and a pre-formed attachment portion, said splicing portion comprising:
an elongate backing member having two faces and two longitudinal edges,
a first adhesive layer on said backing member, said first adhesive layer being provided for attaching the leading edge of said roll of sheet material substantially across the width of said roll to said splicing tape and extending across the width of said backing member from substantially the first longitudinal edge of the backing member to a first position towards the centre thereof; and
and a second adhesive layer on a first face of said backing member and being covered by a least one release foil, said second adhesive layer being provided for attachment to said further sheet material, said second adhesive layer beginning at or beyond, but no overlapping said first position and extending across the width of said backing member to a second position towards the second longitudinal edge of said backing member;
wherein said pre-formed attachment portion is connected to and distributed along said splicing portion for self-supportively and releasably attaching said splicing tape to the outer surface of the underlying winding of said roll of sheet material substantially across the width of said roll, said attachment portion including a third adhesive layer on said backing member for releasing at least said splicing portion from the underlying winding of said roll while leaving the outer surface of the underlying winding in a non-tacky condition, said method comprising the steps of:
attaching said splicing tape to the outer surface of said underlying winding using said third adhesive layer on said backing member substantially across the width of said roll;
attaching said leading edge to said first adhesive layer, and
separating said attachment portion from said splicing portion attached to said leading edge while leaving the outer surface of said underlying winding in a non-tacky condition.
Further the invention provides a method for making a splice between the leading edge of a roll of sheet material and a further sheet material using a splicing tape, each winding of said sheet material on said roll having an outer surface facing radially outwards away from said roll, said splicing tape comprising:
a splicing portion and a pre-formed attachment portion, said splicing portion comprising:
an elongate backing member having two faces and two longitudinal edges;
a first adhesive layer on said backing member, said first adhesive layer being provided for attachment of the leading edge of the roll of sheet material substantially across the width of said roll to said splicing tape and extending across the width of said backing member from substantially the first longitudinal edge of the backing member to a first position towards the centre thereof, and
a second adhesive layer on a first face of said backing member and being covered by at least one release foil, said second adhesive layer being provided for attachment of said backing member to the further sheet material, said second adhesive layer beginning at or beyond, but not overlapping said first position and extending across the width of said backing member to a second position towards the second longitudinal edge of said backing member;
wherein said pre-formed attachment portion is connected to and distributed along said splicing portion for self-supportively and releasably attaching said splicing tape to the outer surface of the underlying winding of said roll of sheet material substantially across the width of said roll; said attachment portion including a third adhesive layer on said backing member for releasing at least said splicing portion from said underlying winding of said roll while leaving the outer surface of the underlying winding in a non-tacky condition, said method comprising the steps of:
attaching said splice tape to the outer surface of said underlying winding using said third adhesive layer on said backing substantially across the width of said roll,
attaching said leading edge to said first adhesive layer,
exposing said second adhesive layer,
attaching the further sheet material to the exposed second adhesive layer, and
releasing said leading edge and said splicing portion attached thereto from said underlying winding while leaving the outer surface of said underlying winding non-tacky.
The invention provides yet a further splicing tape for splicing the leading edge of a roll of sheet material to a further sheet material, each winding of said sheet material on said roll having an outer surface facing radially outwards away from said roll, comprising:
a splicing portion and a pre-formed attachment portion, said splicing portion comprising:
an elongate backing member;
an adhesive layer on said backing member, a first part layer of said adhesive layer being provided for attachment of the leading edge of the roll of sheet material substantially across the width of said roll to said backing member and a second part layer of said adhesive layer being for attachment to said further sheet material;
wherein said preformed attachment portion is connected to and distributed along said splicing portion for releasable and self-supportive attachment of said splicing tape to the outer surface of the underlying winding of said roll of sheet material substantially across the width of said roll, said attachment portion being adapted for releasing at least said splicing portion from said underlying winding of said roll while leaving the outer surface of said underlying winding in a non-tacky condition and said attachment portion includes a stretch releasable adhesive layer.
The present invention may provide the advantage of a splicing tape for a low step profile splice which can pass through subsequent coating and printing machinery smoothly.
Further the splicing tape in accordance with the invention may be applied quickly and accurately.
In addition the splicing tape may have improved environmental compatibility.
The invention may also provide ways of overcoming the blocking phenomenon with weakly adhering adhesive layers.
Additional embodiments of the invention are given in the dependent claims.
Further advantages and embodiments of the invention are described in the following with reference to the drawings.
In the following description of the preferred embodiments of the present invention the same reference signs are used for similar components of the splicing tape throughout the figures.
It should be noted that the thickness of adhesive layers, foils and backing tapes have been exaggerated in the figures for clarity purposes. In the present application the surface of a winding facing radially outwards from the roll is referred to as the outer surface of that winding.
Splicing tape 100 is temporarily attached to the last paper winding still on the drum with an attachment portion provided by the layer of adhesive 41. In this way, the smooth, non-sticky side of the splicing tape 100 facing the drum is prevented from moving whilst the splice is being made, and does not have to be held in place by a large number of operators. Release foil 11 is then removed, as a result of which a part of the sticky side of splicing tape 100 is exposed onto which web end 32 is fixed in such a way that the edge of this end is close to the edge of release foil 10. If part of the web 32 extends over the release foil 10, it can be torn off straight, as is usual in the paper industry, at the transition between foil 11 and release foil 10. After this, splicing tape 100 can no longer move with respect to the web end 32, because it is fixed to end 32. Release foil 10 can now also be removed entirely, which means that the remaining part of adhesive layer 41 comes away from the underlying winding as well as the splicing tape 100. It is preferable that, when release foil 10 is removed, adhesive 41 leaves no substantial quantities of adhesive on the underlying paper winding, i.e. it leaves a non-tacky surface, since this adhesive may otherwise disrupt the way the paper is subsequently printed.
After removal of release foil 10, the further end of the other web can be fixed on the exposed part of the adhesive layer 2 of splicing tape 100. Any part of the further end extending over web part 32 can again be torn off to the correct length in order to form a neat splice. For the sake of clarity, this end is not shown in FIG. 4. Covering adhesive tape 6 can now simply be applied over the splice thus formed as shown in
An additional advantage of the method according to the invention is that, after removing the second release foil 10, the paper reel can be rotated in order, if necessary, to simplify application of the further end of sheet material.
The backing 1 is typically similar in strength and flexibility to the sheet materials to be joined and may be plastic or paper or any similar sheet material. When paper sheets are to be joined it is preferable if the backing material 1 as well as all other materials which remain in the completed splice are repulpable and/or water soluble and/or water dispersible. The thickness of the backing is typically in the range 50-100 micro meters and the width is typically 50-100 millimeters. The surface of the backing 1 should preferably be coatable and/or printable. Suitable materials for joining paper rolls would be super calendered (glassine) or semi-bleached Kraft paper. On one side of the backing 1 an aggressive pressure sensitive adhesive (PSA) layer is applied which may be continuous across the width of the tape as shown in
The above description of the first embodiment demonstrates certain aspects of the present invention. Firstly, a portion of the splicing tape 100, namely a part 10" of the release foil 10 and the adhesive layer 41, is connected to and distributed along the splicing portion 1, 2. This attachment portion 10", 41 is used to temporarily attach the splicing tape 100 to the roll of sheet material. This attachment portion of the splicing tape 100 is sufficient that the splicing tape is self-supporting on the roll, i.e. when applied in a straight line it is capable of supporting its own weight without sagging or pulling.
Secondly, the attachment portion of the splicing tape 100 may be separated from the splicing portion 1, 2 by removing the release foil 10 from the PSA layer 2. This separation of the attachment portion of splicing tape 100 from the splicing portion 1, 2 may be carried out by different means (foil 10, PSA 2) than means for detachment of the attachment portion from the underlying sheet material. Separation of the attachment portion from the splicing tape 100 is sufficient to release the splicing portion 1, 2 from its temporary attachment to the sheet material.
Thirdly, the attachment portion of the splicing tape may be detached from the underlying winding while leaving the outer surface of this winding non-tacky. Detachment of the attachment portion from the underlying sheet material is also sufficient, independent of separation of the attachment portion from the splicing tape 100, to release the splicing tape 100 from its temporary attachment to the sheet material.
Thus, in accordance with the present invention the splicing tape 100 may be temporarily attached to the roll of sheet material and subsequently released therefrom without leaving exposed adhesive material on the outer surface of the underlying winding of sheet material, i.e. leaving a non-tacky outer surface which can be machine coated and/or printed.
The adhesive layer 41, shown in
It is necessary to provide a release foil 10 with appropriate extensive properties. A reusable stretch release tape is described in EP-0563057. Extension of the tape detackifies the adhesive coating and the tape returns to its original length on release and the adhesive regains its adhesive properties. Such a tape can be reapplied to the remaining splice tape 1, 2, 11 which can be repositioned as above.
A non-re-usable stretch release tape is described in EP-0563272. After extension of the tape the adhesive is detackified but the tape remains extended and must be discarded.
Release foils 10 and 11 are similar to those for the adhesive tape according to
The further adhesive tape 40, 41 is removably attached in an overlapping fashion to the release foil 10 as shown in FIG. 5B. The adhesive layer 41, is preferably a stretch releasable adhesive layer 41. The backing 40 may be any suitable stretchable backing material and is not necessarily repulpable or water soluble as this layer is subsequently removed from the splice. It is, however, preferable if all materials used in the splicing tapes in accordance with the invention are recyclable, and/or repulpable. The backing layer 40 is typically 15-50 mm wide.
The adhesive tape 40, 41 may be applied continuously on the length of the main splice tape 1, 2, 10, 11 or discrete lengths of the adhesive tape 40, 41 may be pre-applied intermittently, i.e. distributed along the main splice tape 1, 2, 10, 11. The spacing for the intermittent adhesive areas should be sufficient to maintain the splicing tape 100 in a self-supporting manner when applied to the roll.
The application of the splicing tape as shown in
When the splice is to be made to the trailing edge of a second roll the release foil 10 and the adhesive tape 40, 41 are removed separately so as to expose the remaining part layer of PSA 2. The trailing edge of the second roll is then aligned with the first roll 30 and attached to the splicing tape by pressing the trailing edge against the exposed PSA layer 2. Any excess sheet material of the trailing edge can be removed by folding against the adhesive join and tearing or cutting as described above with respect to the leading edge of the first roll. The junction between the leading and trailing edges in the centre of the splice may then covered by a further narrower adhesive tape 6 as has been described with respect to FIG. 1A.
With the modification of the first embodiment in accordance with
As an alternative to the first embodiment of the invention described above, the double sided stretch release tape may be applied intermittently along the length of the backing 1. The stretch release tape 46, 46' is applied so that the stretch direction of the tape is perpendicular to the longitudinal direction of the splicing tape. Extending beyond the backing 1, non-adhesive gripping portions (not shown) are provided on the ends of the lengths of stretch release tape to enable gripping the stretch release tape.
One advantage of using stretch release adhesive layers is that they do not show the blocking phenomenon known with weakly adhering and repositionable adhesive layers.
The repositionable adhesive layer 42 may be made from any known repositionable adhesive. For the purposes of this invention a repositionable adhesive has a property of adhering to and being removable from the surface of a substrate without transfer of substantial quantities of adhesive material to the substrate surface. This is achieved by making the adhesion of the adhesive layer 42 to the release foil 10 (if necessary by priming the surface of the release foil 10) considerably greater than the adhesion of the adhesive layer 42 to a sheet substrate. Further, after removal it is preferable if the adhesive layer retains substantially its adhesive properties so that it may be reapplied to the same substrate surface. A repositionable adhesive may have a peel strength lower than for a conventional aggressively tacky PSA. In particular, it is preferable if the removal of the repositionable adhesive layer from the paper substrate does not damage the surface fibres of the paper. After detachment printing properties of the paper surface should not deteriorate. Suitable adhesives are those applied to Correction & Cover-up Tape 658 or Scotch Masking Tape 1104 or the repositionable memo pads known as "Post-It" all manufactured by Minnesota Mining and Manufacturing Company, Minn., USA. Further, in accordance with the invention the repositionable adhesive layer is preferably repulpable.
The splicing tape 200 in accordance with the second embodiment is applied in the following way. The release foil 48 is removed from the splicing tape, the leading edge of the first roll of sheet material is lifted and the splicing tape is applied across the width of the roll or in a pattern similar to the one shown in FIG. 3A. The splicing tape is secured to the underlying winding of the roll of sheet material by the repositionable adhesive layer(s) 42. The release foil 11 is then removed exposing the PSA layer 2. The leading edge of the first roll of sheet material is then carefully laid back and is attached to the splicing tape 200 by pressing it against the PSA layer 2. Any excess of the leading edge is torn off against the edge of the PSA layer 2. In this condition the leading edge of the roll of sheet material is secured to the underlying winding of the roll by means of the repositionable adhesive 42 and there are no exposed areas of adhesive so that the roll may be stored in this condition until required.
Immediately before formation of a flying splice in accordance with the second embodiment, the release foil 10 is removed exposing the large area of PSA 2 and the marker tape 26 is applied as was described with respect to the conventional procedure in accordance with FIG. 3A. The roll is then brought up to machine speed and the trailing edge of the second roll is pressed against the exposed PSA layer at the appropriate moment. Because the adhesion of the repositionable adhesive 42 to the underlying winding of the sheet roll is adapted to be lower than the strength of the sheet material and also of the adhesion of the splicing tape to the trailing edge of the second roll, the repositionable adhesive layer 42 lifts off from the underlying winding of the new roll leaving no adhesive residue. The repositionable adhesive layer 42 is designed in such a way that its adhesion to the sheet material is considerably lower than the aggressive PSA layer 2 and its adhesion to the backing 1 is considerably greater than its adhesion to the sheet material of the roll. As a specific aspect of the present invention it is preferable if all materials left in the splice are repulpable including the repositionable adhesive layer 42.
The butt splicing tape 200 in accordance with the second embodiment may have both release foils 10 and 11 of the same width (not shown) when the splicing tape 200 is used to make a permanent butt splice.
In accordance with the second embodiment the attachment portion of the splicing tape 200 is provided by the adhesive layer 42. The means for detaching the attachment portion 42 is provided by the adhesive layer 42 being weakly adhering, preferably repositionable. Detachment of the splice between the interface of the adhesive layer 42 and the underlying winding leaves a non-tacky outer surface. Further the splicing tape in accordance with the second embodiment includes an elongate backing member I and a first adhesive layer (left hand part of layer 2 in
One problem with weakly adhering and repositionable adhesives can be their tendency to adhere more strongly with time depending on pressure, time and temperature. This phenomenon is known as "blocking".
A further modification of the second embodiment of the present invention is shown in
As an alternative, when in particular a flying butt splice is completed with the embodiment described with reference to
The ends of the sheet material are butt spliced on the splicing tape 200 without removing the single-side tape 40, 47. When the sheet material separates from the roll the splice detaches itself from the underlying winding along the interface of the weakly adhering adhesive layer 42 and the backing 40. The backing 40 forms part of the non-tacky outer surface of the underlying winding. The single sided high tack adhesive tape 40, 47, 48 may be applied as a separate tape to the roll of sheet material or may be pre-applied to the splicing tape as described above.
If greater security is required when fixing and working with the splicing tapes in accordance with the first and second embodiments as shown in
Slitting or perforation of the backing 1 is not necessary with the modification including the stretch releasable adhesive layer 46, 46' shown in
When the splicing tape 300 as shown in
With the fourth embodiment of the present invention described with respect to
The splicing tape as shown in
A modification of the fifth embodiment of the present invention is shown in
Prior to completion of the splice the double-sided stretch release tape 46, 46' (if present) is removed.
When it is required to complete the splice the release foil 11 is removed thus exposing the PSA layer 2B. The connection to the trailing edge of the second roll is carried out in accordance with the previous embodiments depending on whether the splicing tape is used to form a permanent splice or a flying splice. In the latter case it is preferable to make the width of the PSA layer 2B considerably wider than the PSA layer 2A as has been described with respect to the seventh embodiment and the repositionable adhesive layer 42 is preferred. Further the repositionable adhesive layer 42 is preferably repulpable.
In a further modification of the sixth embodiment the repositionable adhesive layer 42 of
Alternatively, if the leading edge has already been fixed a knife may be introduced between the backing 1 and the sheet material of the roll below the PSA layer 2B and the splice can be broken out along the weakness or perforation 44. Otherwise when the tape is used as a permanent or flying splice the splice lifts from the underlying winding and tears along the weakness or perforation 44.
With respect to the embodiments described with respect to
In the embodiments shown in
Weirauch, Hans Julius, Holderbusch, Max
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