JP2004338771A - Composite roll sheet for bag-making - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a composite packaging bag which needs to be structured of an opaque sheet and a transparent sheet such as a packaging bag with a window by butt-welding ends with each other. <P>SOLUTION: A composite roll sheet is used as a material sheet of a butt seam pressing bag maker, a horizontal pillow packaging machine or the like. Breadthwise ends of an opaque roll sheet 12 and a transparent roll sheet 16 are overlaid and stuck to each other between a receiving roller 44 and a hot pressing roller 45. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
【Technical field】
The present invention relates to a novel composite sheet for bag-making, and more particularly to a composite sheet for bag-making suitable for producing a bag with a window or as a raw material sheet in a so-called horizontal pillow packaging machine.
[0002]
Here, a case where the present invention is applied to a packaging bag with a window forming a window portion with a transparent sheet will be mainly described as an example, but the present invention is not limited to this.
[0003]
[Background Art]
Recently, a packaging bag with a window is preferred as a packaging bag because the inside of a product can be visually recognized without breaking the packaging.
[0004]
When a packaging bag with a window is to be manufactured, the packaging bag is manufactured as follows using, for example, a Gassho press bag making machine (see FIG. 1).
[0005]
First, the opaque roll sheet (material A) 12 is unwound (extended), molded into a cylindrical section by a molding block (not shown) arranged in the molding section 14, and a transparent roll sheet is interposed between the cylinders. The (B material) 16 is unwound (FIG. 1A). Subsequently, the raw material A and the raw material B are heat-welded (heat-sealed) using a pair of vertical welding press heaters 18 arranged in parallel (FIG. 1B). Thereafter, the bottom position of the packaging bag is heat-welded (bonded) using one or a plurality of (two in the illustrated example) horizontal welding press heaters 20, cooled by a horizontal cooling press 22, and then cut (cut). Machine) 24 to produce a packaging bag W with a window having one end opened. In the illustrated example, 26 is a take-up roll. Each of the roll sheets 12 and 16 is provided with a material or a welding treatment layer which can be welded (welded) to each other on one side or both sides.
[0006]
However, in the case of the above configuration, it is necessary to separately install an automatic packaging device in the next step, or to manually pack bags (products) to be packaged and weld them with a welding machine to close the bags.
[0007]
In addition, since a vertical welding press heater superimposes and attaches a planar state in a tubular state, it is difficult to directly contact the hot press from both sides of the superposed portion. That is, since heating can be performed only from the outer side, wrinkles are easily generated. Further, when the non-transparent sheet was thick (generally, the non-transparent sheet was thicker than the transparent sheet), the tendency became more remarkable. Further, it has not been common practice to bond the transparent sheet so that the transparent sheet is on the outside.
For this reason, it has been difficult to use an easy peel film as the transparent sheet to make a universal design that is easy for old people and children to use (the bag is easy to break). Here, “universal design” means a design that is easier for more people to use.
[0008]
On the other hand, a horizontal pillow wrapping machine as shown in FIG. 2 is capable of automatic wrapping during the process of making wrapping bags, and is often used for packing bread and the like. The bag making and packaging are performed as follows.
[0009]
The material sheet S unwound from one roll sheet 30 is bent upward on both sides by the shaping block 32, and the article to be packaged (product) G is passed under the material sheet (FIG. 2). (A)). Thereafter, longitudinal bonding (seal) is performed with the roller heaters 28, 28 also serving as guide rolls, with the ends in the width direction abutting each other (FIG. 2B). Subsequently, cutting and closing of the front and rear bags are performed using the press-type welding heater 34 also serving as a cutter, thereby completing the bag making and packaging.
[0010]
However, with this horizontal pillow packaging machine, it was difficult to make a packaging bag with a window. That is, it is not possible to bond (seal) in a state of being superposed on a flat surface as in the case of a Gassho press.
[0011]
DISCLOSURE OF THE INVENTION
In view of the above, the present invention provides a composite roll sheet (raw fabric) for forming a composite packaging bag which needs to be composed of different types of sheets such as a packaging bag with a window and which can be formed by butt-welding the ends. The purpose is to provide.
[0012]
The present invention solves the above problems by the following configurations.
[0013]
The bag-making roll sheet of the present invention is formed by bonding different types of roll sheets (winding sheets) such that their widthwise ends are superposed on each other.
[0014]
By using this composite roll sheet for bag making as a raw material (raw material roll sheet), a packaging bag made of a sheet of a different material such as a packaging bag with a window can be horizontally pillowed without using a gasoline press bag making machine. The machine can make bags. Therefore, when making a packaging bag with a window, there is a problem as in the case of making a bag using a gasoline press bag making machine, that is, bag filling and welding by hand, or another automatic packaging machine is provided. Eliminates the need.
[0015]
In addition, since different kinds of sheets such as a non-transparent sheet and a transparent sheet can be bonded in advance while directly pressing on both sides (upper and lower surfaces) of the superposed surface, a clean and reliable bonding (welding) is performed. It can be expected that the quality of packaging bags will be improved.
[0016]
When the composite roll sheet for bag making having the above configuration is applied to a packaging bag with a window, a configuration in which one of the different types of roll sheets is a transparent roll sheet, desirably, is non-transparent at both ends in the width direction of the transparent sheet. The sheet is formed by polymer welding.
[0017]
The apparatus for manufacturing the composite roll sheet for bag making having the above configuration has, for example, the following configuration.
[0018]
An apparatus for manufacturing a composite roll sheet for bag making, comprising a plurality of unwinding shafts arranged so that two or more roll sheets can be unwound by being superposed at an end in a width direction. A process section, a laminating process section provided with a laminating means (welding means) for laminating (fusing) the rolled sheets which are superposed and unwound (extended) at the widthwise ends at the widthwise ends. And a winding step provided with a winding shaft for winding the composite sheet after welding.
[0019]
The welding means in the apparatus for manufacturing a composite roll sheet for bag making is usually a heat welding apparatus or an ultrasonic welding apparatus.
[0020]
Then, the composite roll sheet for bag making of each of the above configurations is attached to an unwinding shaft of a bag making device and used for bag making.
[0021]
As the bag making machine, a horizontal pillow packing machine is desirable, but it is of course possible to make a bag using a gasoline press bag making machine. When used in a gasoline press bag making machine, the dimensional deviation of the bonded portion (welded portion) is previously determined as in the case where different types of sheets are welded by a vertical press in a bag making machine such as a gasoline press machine as before. There is no risk of wrinkles.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described in detail.
[0023]
Here, a case will be described in which a packaging bag W2 with a transparent window as shown in FIG. 3 formed by a pair of non-transparent sheets (non-transparent film) 12 and one transparent sheet (transparent film) 16 is formed. . Even if it is not provided with a transparent window, the present invention can be applied to a packaging bag having an opaque air-permeable window or a parallel multicolor transparent portion.
[0024]
Further, the form of the packaging bag is not limited to this, and transparent sheet / non-transparent sheet = 1 sheet / one sheet, one sheet / a plurality of sheets, plural sheets / one sheet, plural sheets / a plural sheets, or the like.
[0025]
As the transparent sheet, the following can be suitably used.
[0026]
(1) Biaxially stretched PP film capable of heat sealing on both sides: 20 to 60 μm
(2) Unstretched PP film capable of heat sealing on both sides: 20 to 60 μm
(3) Easy peel film (PP, nylon, made of PET): 25 to 60 μm
Further, as the non-transparent sheet, the following can be suitably used.
[0027]
(1) Heat seal paper mixed with PP resin: 20 to 50 g / m ² (with air permeability)
(2) Heat seal paper made of two layers of PP resin and pulp: 20 to 50 g / m ² (with air permeability)
(3) Paper (20-50 g / m ² ) / PP (10-30 μm) laminate (with oil resistance)
(4) Paper (20 to 50 g / m ² ) / PE (8 to 30 μm) / PP (13 to 50 g / m ² ) non-woven fabric laminate (oil absorbing, small amount of water absorbing)
The composite sheet for bag-making according to the present embodiment is manufactured as described below using the above-mentioned sheet material (roll sheet).
[0028]
FIG. 4 is a conceptual diagram of an apparatus for manufacturing a composite sheet for bag making.
[0029]
Basically, it has an unwinding section (unwinding step section) 36, a bonding section (welding / welding section) 38, and a winding step section 40.
[0030]
The unwinding process section 36 includes a plurality of unwinding rolls arranged so that the pair of opaque roll sheets 12 and 12 and one transparent roll sheet 16 can be unwound (unwound) by being overlapped at the widthwise ends. The shaft (extending shaft) 42A, 42A, 42B is provided. Naturally, the number of unwinding shafts may be four or more in accordance with the number of roll sheets.
[0031]
The bonding portion 38 is formed of a heat welding device (heat sealing device) 43 that welds rolled sheets that have been fed out by overlapping at the widthwise ends at the widthwise ends. The heat welding device 43 is formed by a receiving roll 44 and a hot-press roll 45, and the hot-press roll 45 includes a pair of hot-press sections 46. Instead of external heating means such as heat welding, internal heating means such as ultrasonic welding, high-frequency welding, microwave welding, and microwave welding can be used.
[0032]
Although not shown, at least the winding shaft is connected to an output shaft of the prime mover via a transmission means and is drivable.
[0033]
And the composite roll sheet of this embodiment using this apparatus is manufactured as follows.
[0034]
First, each raw material roll sheet 12, 12, 16 is mounted on each of the unwinding shafts 42A, 42A, 42B via a bobbin (not shown) detachable from the unwinding shaft. The roll sheet 12, 12, 16 is passed through and passed through a bobbin (not shown) which is detachable from the winding shaft 46, and the leading ends of the roll sheets 12, 12, 16 are wound and fixed to perform a preparation operation. At the time of this preparation work, the hot-press roll 45 is located slightly above the time of the hot-press work, and each of the sheet rolls 12, 12, 16 can pass in a superposed state between the hot-press roll 45 and the receiving roll 44. Have enough clearance.
[0035]
Subsequently, the receiving roll 44 and the hot-press roll 45 in the heat welding device 43 are heated to a temperature at which heat welding is possible (for example, when both are PP films, about 200 to 150 ° C.), and the prime mover is started and wound. The take-up shaft 46 is rotated in the take-up direction.
[0036]
Then, as shown in FIG. 4 (A), the widthwise ends are subjected to polymerization welding (welding) W (laminated) while the non-transparent sheet 12 is positioned on the outer surface and the transparent sheet 16 is positioned on the inner surface. The layer roll sheet 17 is manufactured. At this time, the winding speed is 20 to 50 m / min when the PP sheet is used. Further, the overlap width of the bonding (welding) is set to about 5 to 15 mm.
[0037]
Normally, the laminating operation is continued until the raw material roll sheets 12 and 16 disappear, and the production of one roll of the multilayer roll sheet 17 is completed. The multilayer roll sheet 17 is usually kept until it is removed from the winding shaft 46 and bag-formed. In addition, before the raw material roll sheets 12 and 16 run out, it is also possible to stop the above-mentioned laminating operation and manufacture a multi-roll composite roll sheet.
[0038]
The composite roll sheet manufactured as described above is mounted on a roll sheet and an unwinding shaft of a bag making machine (horizontal pillow packing machine or gas press press bag making machine), and bag making is performed in a conventional manner. .
[0039]
For example, when applied to a horizontal pillow packaging machine, as shown in FIG. 4 (B), after the product G is passed under the composite roll sheet, the product G is surrounded as shown in FIG. 4 (C). By performing the heat sealing, a packaging bag with a window having a transparent sheet, which has been difficult in the past, can be manufactured while packaging the product G.
[0040]
In FIG. 4, the relationship between the transparent roll sheet (B sheet) 16 and the non-transparent roll sheet (A sheet) 18 may be reversed. That is, the transparent roll sheet 16 may come to the lower side in FIGS. 4A and 4B and the inner side in FIG. 4C.
[0041]
In addition, when the present invention is applied to a gasoline press machine, it is not necessary to superimpose and weld two places by a vertical welding press heater as in the prior art, and it is possible to form a packaging bag with a beautifully finished window. That is, there is no need to perform planar superposition by a vertical welding press heater.
[0042]
That is, the end portions are butt-welded to each other regardless of whether the machine is a bag press machine or a horizontal pillow wrapping machine, so that reliable and beautiful welding (bonding) W can be performed.
[0043]
If an easy peeling material is used as the transparent sheet and the transparent sheet is formed on the outer surface (see FIG. 4C), the universal design can be realized.
[0044]
In the above description, the bag making machine is a gasoline press machine or a horizontal pillow wrapping machine. However, other bag making machines can also be used to weld both ends of the roll sheet (raw material) in the width direction. The composite roll sheet of the present invention can be applied to any bag making machine as long as the composite roll sheet is provided with a bonding means).
[0045]
Furthermore, in the above description, the bag is formed after forming once on the composite roll sheet, but it is also possible to directly form the bag without passing through the composite roll sheet. That is, it is also possible to form a roll sheet (winding sheet) of different types by laminating the widthwise ends of the composite sheet together by laminating and welding the widthwise ends of the composite sheet to each other. It is.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic explanatory view of a gasoline press bag making machine and a bag making explanatory view by the bag making machine.
FIG. 2 is a schematic explanatory view of a horizontal pillow packaging machine and an explanatory view of bag making by the packaging machine (bag making machine).
FIG. 3 is a conceptual diagram illustrating a method for producing a composite roll sheet of the present invention.
FIG. 4 is a process explanatory view in the case of making a bag using the composite roll sheet of the present invention.
[Explanation of symbols]
12 Non-transparent roll sheet (A sheet)
14 Transparent roll sheet (B material)
36 Unwinding process unit 38 Bonding process unit 40 Winding process unit 43 Heat welding device (heat sealing device)
44 Receiving roll 45 Hot-press roll

Claims (9)

A composite roll sheet for bag making, characterized in that different types of roll sheets (winding sheets) are formed by overlapping and bonding the widthwise ends thereof. The composite roll sheet for bag making according to claim 1, wherein one of the different types of roll sheets is a transparent roll sheet. 3. The composite roll sheet for bag making according to claim 2, wherein a non-transparent sheet is superposed and attached to both ends in the width direction of the transparent sheet. 4. An apparatus for producing a composite roll sheet for bag making according to claim 1, 2 or 3, wherein a plurality of roll sheets are arranged such that two or more roll sheets are overlapped at an end in a width direction and can be unwound. Unwinding process section with a feeding shaft, a laminating process section having laminating means for laminating rolled sheets that have been rolled up at the widthwise ends and laminating at the widthwise ends, and And a winding section having a winding shaft for winding the composite sheet after the laminating step. The apparatus for manufacturing a composite roll sheet for bag making according to claim 4, wherein the bonding means is a heat welding apparatus or an ultrasonic welding apparatus. The composite roll sheet for bag-making according to claim 1, 2 or 3 is attached to an unwinding shaft of a raw material roll-sheet for bag-making, and the widthwise ends are butt-welded to produce a bag. Bag making method. The bag making method according to claim 6, wherein the bag making roll is a roll in a horizontal pillow packaging machine. The bag making method according to claim 6, wherein the bag making roll is a gas roll press machine. It is characterized in that different roll sheets (roll-up sheets) are formed by laminating the widthwise ends of the composite sheet together by laminating them, and then butt-welding the widthwise ends of the composite sheet. Bag making method.

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