JP2601590B2 - Method and apparatus for manufacturing ribbed film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a plastic film with ribs capable of efficiently manufacturing a plastic film with ribs having improved rigidity.

[0002]

2. Description of the Related Art Plastic films are rich in flexibility and are used for various purposes by utilizing their excellent properties. By the way, the plastic film may not satisfy the required performance depending on the use because the flexibility is too good. For example, conventionally, a self-supporting bag made of a plastic film that can stand alone without falling down when the contents are put in is known, but the rigidity is insufficient toward an upper portion, so that stability and shape retention are improved. There was a drawback that it could not be said to be excellent. In order to compensate for the lack of rigidity of the plastic film, it is conceivable to provide a rib on the plastic film. However, it is difficult to efficiently provide a rib on a thin plastic film, and it has not been developed until now.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the conventional plastic film, and it is easy to manufacture a plastic film having ribs that can increase the rigidity of the plastic film. It is an object of the present invention to provide a method of manufacturing a plastic film with ribs and a device therefor.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, pressed a pressing die having a linear projection at the tip against a plastic film.
When the thickness of the pressed plastic film portion is reduced to form a linear groove, a raised portion of the plastic film can be formed at the upper end of the groove, and the raised portion is fixed by fixing the raised portion. Have been found, and the present invention has been completed.

That is, according to the present invention, there is provided a stamping die having a linear projection at a tip end, the height of the linear projection being a height which does not hinder the formation of a raised portion formed at an upper end portion of a film groove. Is pressed against the plastic film layer with a low melting point of a multilayer plastic film in which plastic films with different melting points are laminated, and heated to a temperature higher than the melting point of the plastic film with a lower melting point and lower than the melting point of the plastic film with a higher melting point. By pressing the linear protrusions of the pressing die, the thickness of the plastic film layer having a low melting point is reduced to form a linear groove, and a raised portion is formed at the upper end of the groove. A rib is provided on a plastic film by fixing a protruding portion. It is to provide a method. Also,
The present invention provides a stamping means having a stamping die having a linear projection at a tip thereof, and a height of the linear projection is a height which does not disturb the formation of a raised portion formed at an upper end portion of a film groove. A feeding means for feeding a plastic film to the pressing means, and a means for fixing a raised portion formed by pressing the linear projections, to provide an apparatus for manufacturing a plastic film with ribs. It is.

Hereinafter, the present invention will be described in detail. In the method for producing a plastic film with ribs of the present invention,
It is necessary to press a stamping die having a linear projection at the tip against a plastic film. The plastic film used in the present invention is not particularly limited, and various plastic films can be used. As the material of the plastic film, various plastics can be used, for example, polyolefins such as polyethylene and polypropylene, chlorine-containing polyolefins such as polyvinyl chloride, aromatic vinyl polymers such as polystyrene, polyesters such as polyurethane and polyethylene terephthalate. , Polyamides such as nylon, polycarbonate, polyarylate, polyether, ethylene-vinyl acetate copolymer, copolymers with monomers copolymerizable with ethylene such as ethylene-acrylic acid copolymer,
Examples thereof include ionomers, and these substances may be used alone or in combination of two or more. Further, the plastic film may be a single layer or a multilayer structure having two or more layers.

As the multi-layer plastic film having two or more layers, a multi-layer plastic film in which various plastic films such as the above-mentioned plastic films are laminated can be used, but a multi-layer plastic film in which plastic films having different melting points are laminated is used. preferable. In the case of a multilayer plastic film with three or more layers, if a plastic film with a low melting point is laminated on both outer layers than the intermediate layer, pressing linear projections from both sides simultaneously and forming grooves at the same time Can be. Multi-layer plastic films with different melting points have different melting points.When a linear projection is pressed against a low-melting point plastic film at a temperature near the melting point of a low-melting point plastic film, the high-melting point plastic film does not melt. Grooves can be formed only in the plastic film layer having a low melting point. It is preferable to use a multilayer plastic film having a difference in the melting point because it is difficult to cut the plastic film by pressing the linear projections too much. The difference in melting point is not particularly limited, but preferably has a difference of 10 ° C or more, particularly preferably has a difference of 20 ° C or more, and more preferably 30 ° C or more.
Those having the above differences are most preferable.

Examples of the plastic film having a low melting point include polyolefin films such as polyethylene and polypropylene, and examples of the plastic film having a high melting point include engineering plastic films such as stretched nylon 6-6 and stretched polyethylene terephthalate. Can be In order to provide a barrier property to the plastic film, an aluminum foil, a saponified copolymer of ethylene and vinyl acetate (EVAL), a plastic film using vinylidene chloride, etc. may be used for the intermediate layer. it can. Also, a flexible laminated film in which a film of a material other than plastic such as aluminum or paper is laminated on a plastic film can be used. The thickness of the plastic film of the present invention is not particularly limited, but usually 10 μm to 1000 μm is used,
It is preferably from 30 μm to 500 μm, and particularly preferably from 30 μm to 300 μm.

The pressing die used in the present invention has a linear projection at the tip. By pressing the linear projection against the plastic film, the thickness of the plastic film pressed against the projection can be reduced to form a linear groove, and the linear projection rises at the upper end of the groove. A part can be formed. The height of the linear projection is required to be able to form at least a linear groove and not to hinder the formation of a raised portion at the upper end of the groove, and is usually 0.3 mm or more, preferably 0.3 mm or more. 5
３3 mm. The width of the linear projection is a width capable of forming a linear groove, and is usually 0.5 to 5 mm, preferably 0.5 to 3 mm, and particularly preferably 1 to 2 mm. The cross-sectional shape of the linear projection in the width direction is usually the same in width from the tip end of the projection toward the base of the projection so that the linear projection can be easily pulled out from the formed linear groove. Or wider towards the base.

The cross-sectional shape in the width direction of the tip of the linear projection is as follows:
Various shapes such as a curved shape such as a circle and a circular arc, a straight line shape, and a combination thereof can be adopted. Further, the linear projection may have a single linear shape, a single curved shape, or a combination of two or more of them. The arrangement of the linear projections can be variously arranged. For example, one in which two or more linear projections are arranged close to each other in parallel, one in which the linear projections arranged close to each other are arranged at an interval, and one in which two or more linear projections are arranged The ones that are arranged in parallel with an increased interval, those that are arranged in a substantially rhombic shape by intersecting their linear projections,
Various arrangements such as an arrangement in which these shapes are combined are exemplified.

The method of pressing the linear projections against the plastic film as described above can be performed by various methods such as cold compression, ultrasonic irradiation at the time of pressing, and heating and pressing, but heating and pressing are preferable. When the plastic film is heated when pressed against the linear protrusion, it is preferable that the plastic film is heated to a temperature equal to or higher than the melting point of the plastic film when pressed against the plastic film. In particular, when the plastic film is a multilayer plastic film composed of a high-melting-point plastic film layer and a low-melting-point plastic film layer, when the linear projections are pressed against the low-melting-point plastic film layer, the plastic film with the low-melting point is pressed. It is preferable to heat the plastic film to a temperature higher than the melting point and lower than the melting point of the plastic film having a high melting point. The time for pressing the pressing die may be a time necessary for forming the protruding portion, and may be appropriately selected and determined. From the viewpoint of manufacturing efficiency, it is preferable that the pressing time is as short as possible. This time is usually 0.
It is for 3 to 3 seconds, preferably for 0.5 to 2 seconds.
By pressing the linear projection, a linear groove is formed, and a raised portion is formed on at least one side, usually both sides, of the upper end of the groove. Note that the linear projection does not need to be pushed in so far as the plastic film is cut, and it is necessary that the plastic film is always connected to the bottom of the groove, and the thickness of the bottom may be appropriately selected.

In the present invention, the raised portion formed as described above is fixed. The raised portion can be fixed by various methods such as cooling, forced cooling such as cooling-type pressing or cooling by a refrigerant, pressing of a type having a rib-shaped concave portion, or a combination thereof. However, forced cooling is preferable because the production efficiency of the plastic film with ribs is good. The time for forced cooling may be appropriately selected according to the type of the plastic film and the pressing condition of the pressing die. By fixing the raised portion, a rib can be formed on the plastic film.

The height and width of the rib to be formed may be appropriately selected and determined according to the required rigidity. The height of the rib is usually 100 to 500 μm, preferably 150 to 500 μm.
It is 300 μm. Here, the height of the rib means a height from the surface of the plastic film having the groove to the top of the raised portion. The width of the rib is usually 500
5,000 μm, preferably 500-3000 μm
m. In the present invention, the arrangement of the ribs is determined by the arrangement of the linear projections pressed against the plastic film, but it is preferable that the ribs are arranged in parallel at a specific interval. In this case, the distance between each rib is
It is not particularly limited and may be appropriately selected and determined according to the required rigidity and the formed rib shape.

In the present invention, when a plastic film is placed on a flat mold and a linear projection is pressed against the plastic film, the film surface without ribs is flattened and ribs are attached to other surfaces. It is preferable because it can be used. In the present invention, it is preferable that a long plastic film is used as the plastic film, and that the long plastic film is continuously or intermittently fed into the rib forming apparatus to continuously manufacture the plastic film with ribs. The feeding of the plastic film can be performed by various methods, for example, by winding the winding roll continuously or intermittently. Although the rib can be provided on the plastic film as described above, in the present invention, the rib may be provided on only one side of the plastic film, or may be provided on both sides of the plastic film.

Next, an apparatus for manufacturing a plastic film with ribs for implementing the method of the present invention will be described. An apparatus for manufacturing a plastic film with ribs according to the present invention comprises a pressing means having a pressing die having a linear projection at a tip, a feeding means for feeding a plastic film to the pressing die means, and pressing the linear projection. A device for manufacturing a plastic film with ribs, characterized by comprising means for fixing a raised portion formed as described above.
Since these devices have the same functions as those described in the method of manufacturing a plastic film with ribs of the present invention, other devices than those described above will be described.

The pressing means having a pressing die having a linear projection at the tip can be driven by various driving methods. These driving methods include, for example, a method in which a pressing die is moved up and down to press against a plastic film, and a method in which a linear protrusion is provided on the surface of a roll, and the roll is rotated and pressed against the plastic film. There is a method to apply. Also,
The means for fixing the raised portion can be driven by various driving methods. These driving methods include:
For example, there are a method in which the cooling die is moved up and down to press against the plastic film, a method in which the cooling die is separated from the plastic film, and a method in which the cooling roll is rotated and pressed against the plastic film. The pressing means for pressing the linear projections may be provided with a means for fixing the raised portion, or a separate means for fixing the raised portion may be provided. If the press-type means for pressing the linear projection and the means for fixing the raised portion are provided separately, the movement of the plastic film between them
The method can be performed by various methods, for example, a method of interposing a plastic film with a clamp and intermittently moving the plastic film. Further, the device of the present invention can be provided with a winding means for the manufactured plastic film with ribs. The winding means can wind the plastic film continuously or intermittently.

[0017]

In the apparatus of the present invention, the plastic film is fed into the stamping means by a mechanism for feeding the plastic film into the stamping means, and the stamping tool having a linear projection at the tip is pressed against the fed plastic film. The thickness of the plastic film portion against which the linear projection is pressed can be reduced to form a linear groove, and a raised portion can be formed at the upper end of the groove. Furthermore, the rib can be provided on the plastic film by fixing the raised portion by the raised portion fixing means. In the apparatus of the present invention, a long plastic film is used as the plastic film, and the plastic film with ribs can be continuously manufactured by continuously or intermittently supplying the plastic film.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings of embodiments. The present invention is not limited by these examples. In FIG. 1, a long multilayer plastic film 2 (constitution: a two-layer film in which a 140 μm polyethylene film and a 15 μm stretched nylon 6-6 film are laminated, a thickness: 160 μm, and a width:
550mm) is a multi-layer plastic film raw roll 1
Is fed into the stamping die 4 via the dancer roll 3 and the stamping portion is a multilayer plastic film 2.
Is placed on a pedestal 18 (flat mold) made of a flat metal with the stretched nylon 6-6 film face down. One linear projection with a width of 600 μm and a length of 250 mm
The pressing dies 4 arranged in parallel at intervals of cm are lowered by a pressing driving device 5 which can move the pressing dies 4 up and down, and are pressed against the polyethylene film layer of the multilayer plastic film 2. The linear projections provided at the tip of the press die 4 are heated to 180 ° C., and the plastic film is linearly shaped until the depth of the groove becomes 130 μm and the thickness of the bottom of the groove becomes 30 μm. The protrusion was pressed and held for 1 second.

Next, the holding member 8 is lowered by the holding member driving device 9 which can move the holding member 8 up and down, and the multilayer plastic film 2 is pressed intermittently. Thereafter, the pressing die 4 was pulled up by the pressing die driving device 5 and separated from the plastic film. When the pressing die 4 is lifted, the multilayer plastic film 2 is pressed by the holding tool 8 and the cooling die 6 so that the multilayer plastic film 2 is not pulled up together with the pressing die 4. Thereby, the groove width 6
A linear groove having a thickness of 00 μm and a depth of 130 μm was formed, and linear protrusions having a height of 80 μm were formed at both ends of the upper end of the groove. Next, the holding member 8 and the cooling die 6 are pulled up, the multilayer plastic film 2 is driven by the clamps 10 and 13 by the clamp driving devices 11 and 14, and clamped by the clamps 10, 12, 13 and 15, respectively. The pitch is moved by one pitch in the horizontal direction along the clamp shaft 16 by the pitch feeder and sent to the next cooling device. After moving the multilayer plastic film 2 by one pitch, each clamp returns to the original position again.

In the cooling device, the cooling die 6 is lowered by a cooling type driving device 7 which can move the cooling die 6 up and down, and is brought close to the multilayer plastic film 2. The cooling mold 6 blows air of 25 ° C. onto the surface of the multilayer plastic film 2 for 1.5 seconds. Thereafter, the cooling mold 6 is pulled up and the ribbed multilayer plastic film 2 is wound around a winding roll 20. After the air is started to be blown by the cooling die 6, the pressing die 4 is lowered and pressed against the multilayer plastic film 2. Then, the operation is repeated sequentially according to the above procedure, and a plastic film with ribs can be manufactured continuously. The tension of the fed plastic film 2 can be adjusted by a dancer roll. As a result, a rib could be provided on the plastic film by providing a groove only in the polyethylene film layer.

In FIG. 2, parallel ribs are formed on one side of the multilayer plastic film 2. FIG. 3 shows another embodiment of the rib formed on the multilayer plastic film 2. The rib has a diamond shape. FIG. 4 shows a linear projection 22 at the tip of the die 4,
23 is pressed against the multilayer plastic film 2 and the groove 2 is pressed.
FIG. 5 is an enlarged cross-sectional view showing a state in which a raised portion 5 and a raised portion 24 are formed. FIG. 5 shows the linear projections 22 and 2 of FIG.
Groove 25 and raised portion 24 when interval of 3 is shortened
FIG. 3 is an enlarged cross-sectional view showing a state in which a pattern is formed. At this time, the width of the linear projections 22 and 23 is 500 μm,
The interval is 2 mm. Therefore, three raised portions 24 are provided.

[0022]

According to the present invention, a rib can be easily and efficiently provided on a plastic film.

[0023]

[Brief description of the drawings]

FIG. 1 is a schematic view showing an apparatus for producing a plastic film with ribs according to the present invention.

[0024]

FIG. 2 is a plan view showing a plastic film with ribs manufactured according to the present invention.

[0025]

FIG. 3 is a plan view showing a plastic film with ribs manufactured according to the present invention.

[0026]

FIG. 4 is a cross-sectional view showing a state in which a pressing die having linear projections according to one embodiment of the present invention is pressed against a plastic film.

[0027]

FIG. 5 is an enlarged cross-sectional view showing a state when a pressing die having linear projections according to one embodiment of the present invention is pressed against a plastic film.

[0028]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multi-layer plastic film raw roll 2 Multi-layer plastic film 3 Dancer roll 4 Press type 5 Push type drive 6 Cooling type 7 Cooling type drive 8 Pressing tool 9 Press driving device 10 Clamp 11 Clamp driving device 12 Clamp 13 Clamp 14 Clamp Driving device 15 Clamp 16 Clamp shaft 17 Clamp pitch feeder 18 Cradle 19 Dancer roll 20 Take-up roll 21 Rib 22 Linear projection 23 Linear projection 24 Embossed portion 25 Groove

Claims (3)

(57) [Claims] 1. A pressing die having a linear projection at the tip and having a height such that the height of the linear projection does not hinder the formation of a bulge formed at the upper end of the film groove is adjusted to a melting point. When a plastic film having a difference is pressed against a plastic film layer having a low melting point of a laminated multilayer plastic film, the plastic film is heated to a temperature higher than the melting point of the plastic film having a lower melting point and lower than the melting point of the plastic film having a higher melting point. By pressing the linear protrusions of the press type, the thickness of the plastic film layer with a low melting point is reduced to form a linear groove, and a raised portion is formed at the upper end of the groove, and the raised portion is fixed. The method for producing a plastic film with ribs, wherein the ribs are provided on the plastic film. 2. The method for producing a plastic film with ribs according to claim 1, wherein the fixing of the raised portion is performed by cooling. 3. A stamping die having a linear projection at a tip thereof and having a height such that the height of the linear projection does not hinder the formation of a raised portion formed at the upper end of the film groove. Means for feeding a plastic film to the stamping means, and means for fixing a raised portion formed by pressing the linear projection.