JP7444594B2 - How to make paper bags using laminated paper - Google Patents

Description

The present invention relates to laminated paper and a paper bag using laminated paper, and more specifically, to a laminated paper configured such that a laminate layer can be easily peeled off from a base paper, and a paper bag using laminated paper. and how to make it.

An example of a paper bag handed to a consumer when purchasing a product at a department store or the like is a paper bag made of laminated paper. Paper bags made of laminated paper are in high demand because laminated paper is durable and protects paper bags from water and stains caused by rain and wind.

Japanese Patent Application Publication No. 5-154966

Nowadays, environmental pollution caused by plastic waste has become a serious problem, and in order to reduce the amount of plastic waste, consumers of laminated paper are trying to remove the laminate layer from the base paper of used laminated paper. It is preferable that the base paper (laminate base material) and the synthetic resin or biodegradable resin (laminate layer) can be separated and collected for reuse.

However, even if consumers of laminated paper try to peel only the laminate layer from used laminated paper, it is difficult to peel the laminate layer cleanly from the base paper, and if they try to forcefully pull the laminate layer, the base paper will The wood will break.

An embodiment of the present invention is a laminated paper in which a synthetic resin or a biodegradable resin is laminated on one surface of a base paper, and the paper can be removed from the base paper with the force of the fingers without tearing the base paper. To provide laminated paper which is laminated with synthetic resin or biodegradable resin to such an extent that it can be peeled off.

In a further embodiment, the synthetic resin or biodegradable resin is laminated with a predetermined varnish or medium coated on one surface.

A further embodiment is characterized in that the amount of varnish or medium applied at a predetermined location on one surface is greater than the amount applied at other locations on one surface.

The present invention also provides a paper bag using laminated paper, in which the laminated paper is folded so that the above-mentioned one surface of the laminated paper becomes the outer surface of the paper bag.

In one embodiment of the present invention, in a method for making a paper bag using laminated paper, a synthetic resin or a biodegradable resin is applied to one surface of the base paper that has not been subjected to corona discharge treatment as a pretreatment for lamination. A step of extrusion laminating, in which the synthetic resin or biodegradable resin is laminated to such an extent that it can be peeled off from the base paper with the force of fingers without damaging the base paper. and folding a laminated base paper so that the laminated surface becomes the outer surface of the paper bag.

In another embodiment, in a method for making a paper bag using laminated paper, a predetermined varnish or medium is applied to one surface of the base paper that has not been subjected to corona discharge treatment as a pretreatment for lamination. step, and a step of extruding and laminating a synthetic resin or biodegradable resin on the above-mentioned surface coated with a predetermined varnish or medium, and peeling it off from the base paper with the force of fingers without damaging the base paper. a step of extrusion lamination, in which a synthetic resin or a biodegradable resin is laminated to the extent that the paper bag can be laminated, and the laminated base paper is folded so that the laminated surface becomes the outer surface of the paper bag. A method for making a paper bag using laminated paper is presented, including the steps of:

In a further embodiment, the step of applying includes applying a greater amount of varnish or medium at a given location on the surface than at other locations on the surface. including.

In a further embodiment, the predetermined varnish or medium is a paraffinic varnish or medium.

FIG. 1 is a perspective view showing a laminated paper according to an embodiment of the present invention. The perspective view which shows the laminated paper in other Examples. FIG. 1 is a diagram showing an example of a printing device for applying varnish or medium. FIG. 1 is a developed view of a paper bag in an embodiment of the present invention. A flowchart showing the process of manufacturing a paper bag. FIG. 3 is a diagram illustrating how a laminate layer is peeled off from the surface of a paper bag. FIG. 3 is a diagram illustrating how a laminate layer is peeled off from the surface of a paper bag. A diagram showing how the pattern of a paper bag changes when the laminate layer is peeled off.

The laminated paper of the present invention, a paper bag using the laminated paper, and a method for making the same will be explained with reference to the attached drawings.

FIG. 1 shows a laminated paper 1 according to a first embodiment of the present invention. As shown in FIG. 1(a), one surface of the base paper 2 of the laminated paper 1 is coated with synthetic resin or biodegradable resin such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET). It is laminated. Polyethylene is a mixture of molecules with a molecular weight of about 10 ² to 10 ⁶ , and polyethylene with a wide molecular weight distribution is often used in lamination. Materials used as the base paper include high-quality paper, kraft paper, pure white roll paper, glassine paper, parchment paper, manila ball, and white ball.

Furthermore, a feature of the laminating process in the present invention is that corona discharge treatment, which is usually performed as a pretreatment for laminating process, is not performed. By not performing the corona discharge treatment, the finished laminated paper becomes one in which the laminate layer 4 can be cleanly peeled off from the base paper 2 (without tearing the base paper 2). FIG. 1(b) shows a portion of the laminate layer 6 that has been partially peeled off from the base paper 2.

FIG. 2(a) shows a laminated paper 10 according to a second embodiment of the present invention. The laminated paper 10 of the second form is laminated with a predetermined varnish or medium (overcoat agent) 14 coated on one surface of the base paper 12. By applying varnish or medium 14 before laminating, when peeling the laminate layer 16 from the finished laminated paper 10, it is possible to cleanly (break the base paper 12) with a certain amount of force. The laminate layer 16 can now be peeled off without causing any damage. An example of the predetermined varnish or medium 14 in the present application is preferably a paraffin-based varnish or medium.

In one embodiment, the laminated paper 10 of the present invention has a thickened portion 18 (shaded portion) where the amount of a predetermined varnish or medium to be coated is partially increased. The part of the laminate layer overlaid on this thickened part 18 is a place that is easy to pick up with the user's fingers, so the user starts peeling off the laminate layer 16 using this thickened part 18 as the starting point of the peeling operation. I can do it. FIG. 2(b) shows a portion of the laminate layer 20 that has been partially peeled off from the thickened portion 18.

FIG. 3A shows how a predetermined varnish or medium 14, 14' is applied using a relief printing device 30 that performs flexo printing or the like. As shown on the right side of FIG. 3(a), when the liquid agent roller 32 is immersed in the liquid agent tray 31, a predetermined varnish or medium 14, 14' is accommodated in the plurality of grooves formed in the liquid agent roller 32. be done. After the excess varnish or medium 14, 14' is scraped off by the doctor blade 33, the varnish or medium 14, 14' placed on the printing area 36, 36' of the relief plate 34 is transferred to the rotating impression cylinder 38. The image is transferred to the base paper 12 by the action of . In this way, the varnish or medium 14, 14' applied to the entire base paper 12 can be applied so as to be scattered on the base paper 12 as a plurality of fine dots.

In one embodiment, as shown in FIG. 3(a), a large amount of varnish or medium 14' is accommodated in a particular groove that is particularly deep among a plurality of grooves formed in the liquid agent roller 32. Ru. The amount of varnish or medium 14' placed on a particular image area 36' corresponding to that particular groove is greater than the amount of varnish or medium 14 placed on other image areas 36. When this varnish or medium 14' is transferred to the base paper 12, it becomes thicker than the varnish or medium 14 transferred from other image areas 36, and becomes thicker than the thickened area 18 (see FIG. 2) consisting of the varnish or medium 14'. ) is formed. The portion of the laminate layer 20 overlaid on the thickened portion 18 is the portion that the user pinches with his or her fingers when starting to peel the laminate layer 16 from the base paper of the finished laminated paper.

The dashed-dotted line on the left side of FIG. 3(a) shows the state immediately before the image areas 36, 36' of the letterpress 34 carrying the varnish or medium 14, 14' pass under the impression cylinder 38. . As shown, the amount of varnish or medium 14' on the image area 36' is greater than the amount of varnish or medium 14 on the image area 36.

In another embodiment of the present invention, the grooves of the liquid roller 32 have the same depth, and the varnish or medium is applied to each predetermined location one color at a time using two-color printing. A thick raised portion 18 (see FIG. 2) can be formed.

FIG. 3(b) shows how a predetermined varnish or medium 14, 14' is applied using the intaglio printing device 40. As shown on the right side of FIG. 3(b), the intaglio plate 44 is immersed in the liquid dish 42 of the varnish or medium 14, 14', placing the varnish or medium 14, 14' on the image area 48, 48'. Then, the excess varnish or medium 14, 14' is scraped off by the doctor blade 46, and the varnish or medium 14, 14' remaining in the image areas 48, 48' is removed from the base paper by the action of the rotating impression cylinder 50. It is transferred to 12. In the embodiment shown in FIG. 3(b), the image portion 48' is formed deeper than the image portion 48. In the embodiment shown in FIG. As a result, the varnish or medium 14' transferred from the image area 48' becomes thicker than the varnish or medium 14 transferred from the other image areas 48, and the thickened portion consisting of the varnish or medium 14' 18 (see FIG. 2) is formed. The portion of the laminate layer 20 overlaid on the thickened portion 18 is the portion that the user pinches with his or her fingers when starting to peel the laminate layer 16 from the base paper of the finished laminated paper.

The dashed-dotted line on the left side of FIG. 3(b) shows the state immediately before the image areas 48, 48' of the intaglio 44 containing the varnish or medium 14, 14' pass under the impression cylinder 50. ing. As shown in the figure, the amount of varnish or medium 14' accommodated in the image portion 48' formed deeper than the image portion 48 is greater than the amount of varnish or medium 14 accommodated in the image portion 48. There are also many.

FIG. 4 is a developed view of a paper bag 60 formed from laminated papers 1 and 10. When one side 62, one side 64, gusset part 66, and bottom part 68 of the paper bag 60 in this developed view are folded, and the glue margin 70 is superimposed on the one side 64, the paper bag 60 It becomes the shape. Furthermore, a handle 72 for carrying (see FIG. 8) may be attached as necessary.

In one embodiment, when the paper bag 60 is made from the laminated papers 1 and 10, the laminate layer 16 may not be applied only to the portion of the finished paper bag 60 that should become the glue margin 70. In other embodiments, the laminate layer 16 may not be applied to a portion that is folded over the bottom portion 68 of the finished paper bag 60 and is not exposed to the outside of the finished paper bag 60.

FIG. 5 is a flowchart showing the process of making a paper bag. FIG. 5(a) shows the process of making a paper bag using the laminated paper 1 of the first form shown in FIG. FIG. 5(b) shows the process of making a paper bag using the second form of laminated paper 10 shown in FIG. The conditions for extrusion laminating the synthetic resin or biodegradable resin in Figures 5(a) and (b) are as follows: ambient temperature of 200°C to 400°C, processing speed of 100 m/min, 3 kg/cm ² to 5 kg/cm The values for the laminating device are set so that the nip pressure (pressure roll pressure) is cm ² and the air gap is 120 mm to 150 mm. However, these values may differ depending on the type of laminating apparatus used .

FIG. 6(a) shows a paper bag 60 made from the laminated paper 10 of the present invention. In order to peel off the laminate layer 16 from the base paper 12 of the paper bag 60, the paper bag 60 is first dismantled by opening the bottom surface 68, as shown in FIG. 6(b). To peel off the laminate layer 16 from the paper bag 60, slowly peel the laminate layer 16 by pinching the laminate layer overlaid on the thickened portion 18 of the second form of laminated paper 10 (see FIG. 2) with your fingers. and pull it to peel it off from the base paper 12. Thereby, the user of the paper bag 60 can separate the paper bag 60 into the base paper (laminate base material) and the synthetic resin or biodegradable resin (laminate layer) and collect them. In the embodiment shown in FIG. 6(c), the starting point of the peeling operation is located at the upper right end of one side 64 of the paper bag 60.

On the other hand, as shown in FIG. 7, the starting points of the peeling operation may be arranged at multiple locations. FIG. 7(a) is a perspective view of a paper bag 60 made from laminated paper 10, and FIG. 7(b) shows how the laminate layer 16 is peeled off from the paper bag 60. To peel off the laminate layer 16 from the paper bag 60, pinch the laminate layer overlaid on the thickened portion 18 of the second form of laminated paper 10 (see FIG. 2) with your fingers, and slowly peel off the laminate layer 16. and pull it to separate it from the base paper of the paper bag 60. In one embodiment, the laminate layer 16 attached to each of the one side 62, the one side 64, and the gossamer part 66 of the paper bag 60 is peeled off, and the plurality of laminate layers 16 applied to the bottom part 68 are peeled off. In some cases. In this way, when the laminate layer 16 is applied only to the outer surface of the paper bag 60, the user can remove the laminate layer 16 from the base paper 12 without opening the bottom surface 68 of the paper bag 60. can be peeled off. Thereby, the user of the paper bag 60 can separate the paper bag 60 into the base paper (laminate base material) and the synthetic resin or biodegradable resin (laminate layer) and collect them for reuse.

Alternatively, if the user of the paper bag 60 drops the paper bag 60 on the ground and becomes seriously soiled, it is preferable to peel off the laminate layer 16 along with the soil. This allows the user to use a paper bag from which dirt has been cleanly removed.

In one embodiment, the base paper 12 and the laminate layer 16 are provided with different patterns so that the paper bag 60 can be rearranged. For example, in the embodiment shown in FIG. 8(a), a star-shaped pattern is drawn on the laminate layer 16, and when this laminate layer 16 is peeled off from the base paper 12, the pattern shown in FIG. 8(b) is drawn. A base paper 12 with a heart-shaped pattern drawn thereon appears. In this case, the user can peel off the laminate layer 16 to select a heart-shaped pattern according to his/her preference.

1... Laminated paper 2... Base paper 4... Laminate layer 6... Part of the laminate layer 10... Laminated paper 12... Base paper 14... Varnish or medium 14'... Varnish or medium 16... Laminate layer 18... Thick raised portion 20 …Some laminate layers (starting point)
30...Letterpress printing device 31...Liquid pan 32...Liquid roller 33...Doctor blade 34...Letterpress 36...Printing section 36'...Printing section 38...Impression cylinder 40...Intaglio printing device 42...Liquid pan 44...Intaglio 46...Doctor Blade 48...printing part 48'...printing part 50...impression cylinder 60...(laminated) paper bag 62...one side 64...one side 66...goss part 68...bottom part 70...glue section 72...handle

Claims (3)

In the method of making paper bags using laminated paper,
A step of applying a predetermined varnish or medium to one surface of the base paper that has not been subjected to corona discharge treatment as a pretreatment for lamination using a letterpress plate and a liquid roller of a letterpress printing device , Some of the plurality of grooves formed in the liquid roller are formed such that the amount of varnish or medium applied at a predetermined location is greater than the amount applied at other locations on the one surface. The groove is formed deeper than the other grooves, and when the liquid roller is immersed in the liquid tray containing the predetermined varnish or medium, after the predetermined varnish or medium is accommodated in the plurality of grooves. , a coating step configured to be placed on the printing area of the letterpress ;
A step of extruding and laminating a synthetic resin or biodegradable resin on the above-mentioned surface coated with a predetermined varnish or medium, and peeling it off from the base paper with the force of the fingers without damaging the base paper. an extrusion lamination step in which the synthetic resin or biodegradable resin is laminated to the extent possible;
folding the laminated base paper so that the one laminated surface becomes the outer surface of the paper bag;
including,
How to make paper bags using laminated paper. In the method of making paper bags using laminated paper,
A step of applying a predetermined varnish or medium to one surface of the base paper that has not been subjected to corona discharge treatment as a pretreatment for lamination using an intaglio plate of an intaglio printing device , A specific one of the plurality of image areas formed on the intaglio plate is applied so that the amount of the predetermined varnish or medium applied at that location is greater than the amount of application at other locations on the one surface. The image area is formed deeper than the other image areas, and when the intaglio plate is immersed in the liquid dish containing the predetermined varnish or medium, the predetermined varnish or medium spreads over the plurality of image areas. a coating step configured to be placed on the
A step of extruding and laminating a synthetic resin or biodegradable resin on the above-mentioned surface coated with a predetermined varnish or medium, and peeling it off from the base paper with the force of the fingers without damaging the base paper. an extrusion lamination step in which the synthetic resin or biodegradable resin is laminated to the extent possible;
folding the laminated base paper so that the one laminated surface becomes the outer surface of the paper bag;
including,
How to make paper bags using laminated paper. 3. The method for making a paper bag using laminated paper according to claim 1 or 2 , wherein the predetermined varnish or medium is a paraffin-based varnish or medium.

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