Disclosed are a pouch for containing a material therein, a laminate film for the pouch, and a method for producing the pouch. The laminate film comprises a first plastic layer and at least one second plastic layer on which said first plastic layer is laminated. The first plastic layer is partially subjected to surface roughening treatment prior to the lamination, and surface irregularities are filled with a plastic material of the second plastic layer. In a pouch having substantially rectangular shape, at least one folded portion is provided at a side edge of the pouch. The surface roughened portion is positioned at and around the folded portion and at an external surface of the pouch. In one embodiment, the folded edge is provided at one side of the pouch and a heat sealed portion is provided at the other side edge thereof. In another embodiment, folded portions are provided at both side edges of the pouch and a heat-sealed portion is provided at a rear central portion thereof.
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1. A laminate film for pouch comprising:
an external plastic layer; and, at least one internal plastic layer on which said external plastic layer is laminated; said external plastic layer being formed with a surface roughened portion at a non-heat-sealed position corresponding to a folded portion of a resultant crossing a fold line of the pouch.
10. A pouch comprising: a laminated film defining a rectangular pouch body; said laminated film comprising an external plastic layer and an internal plastic layer, said laminated film being formed with at least one folded portion containing a fold line, and a heat-sealed portion connecting free ends of said laminated film, a non-heat-sealed area of said folded portion being formed with a surface roughened portion which crosses said fold line and is formed at the external side of said pouch.
24. A method for producing a pouch comprising the steps of:
preparing a rectangular first plastic film web and at least one rectangular second plastic film web; roughening partial surface portions of a one surface of said first plastic film web, said partial portions corresponding to folded portions crossing a non-heat-sealed portion of said web corresponding to at least one fold line of said pouch; laminating together said first and second plastic film webs to provide a composite film; cutting said composite film into rectangular segments; folding said rectangular segment, segments along said fold line; and heat-sealing free ends of said rectangular segment segments.
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a pouch body formed of a laminate sheet including at least two layers of material, the laminate sheet comprising: a first layer formed of a plastic material and being provided with a tear facilitating surface roughened portion comprising surface irregularities; a second layer laminated to the first plastic layer; and filling material at least partially filling the surface irregularities; wherein the tear facilitating surface roughened portion forms a guide line extending across a non-heat-sealed portion of the pouch body for tearing
the pouch body along the guide line. 32. The pouch as claimed in claim 31, wherein said first layer is an exterior layer of said pouch. 33. The pouch as claimed in claim 31, wherein the filling material comprises a resin. 34. The pouch as claimed in claim 31, wherein the second layer is formed of a plastic material and wherein the filling material is the same as the plastic material of the second layer. 35. The pouch as claimed in claim 34, wherein the filling material is material flowed from the second layer into the surface irregularities during lamination of the first and second layers. 36. The pouch as claimed in claim 31, wherein said surface irregularities comprise a plurality of scores or scratches. 37. A pouch comprising: a pouch body formed of a laminate sheet including at least two layers of material, the laminate sheet comprising: a first layer formed of a plastic material and being provided with a tear facilitating surface roughened portion comprising surface irregularities; a second layer laminated to the first plastic layer; and filling material at least partially filling the surface irregularities; wherein said surface roughened portion has a continuous meandered arrangement extending across a non-heat-sealed portion of the pouch body and providing a resultant surface roughened portion of relatively large width. 38. A pouch comprising: a pouch body formed of a laminate sheet including at least two layers of material, the laminate sheet comprising: a first layer formed of a plastic material and being provided with a tear facilitating surface roughened portion comprising surface irregularities; a second layer laminated to the first plastic layer; and filling material at least partially filling the surface irregularities; wherein said surface roughened portion is formed of a plurality of circular rough surface portions arranged in a plurality of rows directed parallel to each other and obliquely to an edge of the pouch and extending across a non-heat-sealed portion of the pouch body. 39. A sheet product comprising at least one plastic sheet having a tear facilitating surface roughened portion, said surface roughened portion comprising a group of densely formed and randomly oriented surface irregularities, said group being in the form of a continuous meandered arrangement providing a resultant surface roughened portion of relatively large width. 40. The sheet product claimed in claim 39, wherein said sheet product is a sealed pouch. 41. A sheet producing comprising at least one plastic sheet having a tear facilitating surface roughened portion, said surface roughened portion being formed of a plurality of circular rough surface portions, each containing densely formed and randomly oriented surface irregularities, arranged in a plurality of rows directed parallel to each other and obliquely to an edge of the product. 42. A sheet product as claimed in claim 41, wherein said sheet product is a sealed pouch. |
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The present invention relates to a sack or pouch for packing a material therein and to a laminate film for the sack, and more particularly, to the sack and the laminate film which is easily tearable yet having sufficient fracture strength and sealability.
The present invention also relates to a method for producing such sack or pouch and for producing the laminate film therefor.
A composite film is generally available as a material of a sack or pouch. The composite film includes a polyethylene film laminated on an ordinary cellophane sheet or paper. When the pouch or the sack formed of the laminated film is required to be opened, a heat-sealed portion of the pouch can be manually torn, i.e., a user can prsentan external side of a resultant pouch shown, for example, in FIG. 5(a), and at a folded portion 5 thereof. This roughened surface 10 serves to easily tear the pouch open.
Prior to the extrusion-lamination of the polypropylene film 7 onto the polyethylene film 8, the polypropylene film 7 is subjected to surface roughening treatment, so that scored or scratch portions 9 are formed on the film 7 as shown in FIG. 3. These bores or holes or dimples at the scored portions are filled with polyethylene material during subsequent lamination process. Therefore, the outer surface of the polypropylene film 7 becomes is are filled with polyethylene material of the polyethylene film 53. In the surface roughening step, instead of the emplyment employment of the sand-paper, a laser beam is used to provide a plurality of perforations or to provide linear recesses. Alternatively, corona discharge, plasma discharge and untrasonic ultrasonic wave are also available for forming the surface irregularities.
The surface roughening is carried out so as to provide the surface roughened zones having a predetermined width by a given intervals corresponding to the size and shape of the pouch.
Thus prepared laminated film 6a is subjected to cutting or slitting, and thereafter, each of the cut segments is folded and heat-sealed. In this case, there are surface roughened zone at the folded portion, i.e., at least one of the side edges of the pouch. If desired, additional surface roughened zone is provided whose position corresponds to the rear central folded portion of the pouch. Of course, this additional surface roughened zone is provided prior to the lamination step.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent for those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention.
Moteki, Yoshiji, Yamazaki, Shokichi, Oshima, Shigeyuki
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