JP2002120193A - Lamination layer removing method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet lamination layer removing technology capable of stably cutting and eliminating a film from a sheet lamination for a long time. SOLUTION: At least one layer of a sheet lamination comprising plural layers including a thermoplastic resin layer is cut and removed using a cutting tool in the lamination layer removing method. The sheet lamination is cut under a cold condition.

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 removing layers of a laminate, and more particularly, to a method for removing a foamed sheet or a non-foamed sheet of a thermoplastic resin such as polystyrene, polyethylene or polypropylene. ,
For example, from a sheet-like laminate in which different material layers such as a film having a printed pattern, a colored film, or a film made of a thermoplastic resin different from the base layer are laminated, the different material layers are efficiently cut and removed, and the remaining substrate is removed. The present invention relates to a method and an apparatus for removing a layer of a laminate, which makes the layer recyclable.

[0002]

2. Description of the Related Art Recently, awareness of environmental problems has increased, and interest in effective use of resources has been increasing. A sheet-like laminate obtained by laminating a layer (hereinafter sometimes referred to as a film) made of a different material such as a film on the surface of a base layer such as a plastic sheet (including a plate-like one) is no exception. In order to recycle the base layer from such a sheet-like laminate, a metal brush, a grindstone, a cutting tool, a cutting tool such as a file is brought into rotational contact with the different material layer side while conveying the sheet-like laminate, A technique for cutting and removing a different material layer is known (for example, JP-A-62-35809).

The inventors of the present invention have conducted a cutting test of a film based on the above-mentioned well-known technical idea, and have found the following. That is,
If cutting is continued for a long time, the cutting tool becomes hot due to friction between the laminate and the cutting tool, and the surface of the laminate melts under the influence of the heat, and the film that should have been cut melts and is laminated. Sticking to the body surface made it difficult to remove the target film.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and enables stable cutting and removal for a long time when cutting and removing a film from the above-mentioned sheet-like laminate. An object of the present invention is to provide a method and an apparatus for removing a layer of a sheet-like laminate.

[0005]

Means for Solving the Problems In view of the above-mentioned problems of the prior art, the present inventors have conducted intensive studies and as a result, have found that the surface of the sheet-like laminate is cooled in advance and then cut with a cutting tool.
Cutting with a cutting tool while cooling the surface of the sheet-like laminate, or cutting with a cutting tool while cooling the surface of the sheet-like laminate and cooling the surface of the sheet-like laminate in advance for a long time The inventors have found that stable cutting is possible, and have completed the present invention.

That is, according to the present invention, in order to solve the above-mentioned problems, at least one layer of a sheet-like laminate comprising a plurality of layers including a thermoplastic resin layer is cut and removed using a cutting tool. In the method of removing a layer of a body, there is provided a method of removing a layer of a laminate, wherein the sheet-like laminate is cut under cooling conditions. Further, according to the present invention, there is provided a method for removing a layer of a laminate, wherein the cutting tool is made of a porous body having air permeability. Further, according to the present invention, in the above-mentioned method, in the above-mentioned method, a laminate having a large number of air-permeable holes extending from the inside of the cutting tool toward the surface of the cutting tool is formed. A method for removing the layer is provided. Further, according to the present invention, in the above method, it is preferable to cut and remove at least one layer of the sheet-like laminate while ejecting a cooling fluid from inside the cutting tool toward the surface of the cutting tool. A method for removing a layer of a featured laminate is provided. Further, according to the present invention, in the above-mentioned method, at least one layer of the sheet-like laminate is cut and removed while forming an air flow from the surface of the cutting tool toward the inside of the cutting tool. A method for removing a layer of a featured laminate is provided. Further, according to the present invention, in the above method, at least one layer of the sheet-like laminate is cut after or while spraying a cooling medium on the surface of the sheet-like laminate to be cut, There is provided a method for removing a layer of a laminate, characterized by removing. Further, according to the present invention, a conveying means for conveying a sheet-like laminate composed of a plurality of layers including a thermoplastic resin layer, and at least one of the sheet-like laminates installed at an appropriate position on a conveying path by the conveying means. It has a cutting tool for cutting and removing one layer, and a cooling means for cooling the sheet-like laminate, and is characterized in that the sheet-like laminate is cut under cooling conditions. An apparatus for removing layers of a laminate is provided. Further, according to the present invention, in the above apparatus, the cutting tool is:
An apparatus for removing a layer of a laminate, comprising a porous body having air permeability, is provided. Furthermore, according to the present invention, in the above apparatus, the cutting tool is characterized in that a number of air-permeable holes are formed from the inside of the cutting tool toward the surface of the cutting tool. There is provided an apparatus for removing layers of a laminate.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The present invention relates to a method for removing a layer of a laminate, in which at least one layer of a sheet laminate including a plurality of layers including a thermoplastic resin layer is cut and removed using a cutting tool. The laminate is cut under cooling conditions.

[0008] The sheet-like laminate to be used in the present invention is basically composed of a base layer made of a thermoplastic resin layer and a different material layer (film) made of a material different from the thermoplastic resin laminated on the surface thereof. Consists of The thermoplastic resin layer may be a single layer or two or more layers. Further, the film may have one layer or two or more layers.

The thermoplastic resin layer constituting the base layer may be a foamed sheet of polystyrene, polyethylene, polypropylene or the like or a non-foamed sheet. In the present invention, the sheet also includes a plate-like sheet. The thickness of the base layer may be an appropriate thickness, but is usually 0.2 mm.
It is about 2 cm.

The heterogeneous material layer may be of various types as long as it is made of a material different from the thermoplastic resin constituting the base layer, and may be a film having a printed pattern, a colored film, or a thermoplastic resin different from the base layer. And the like. The thickness of the dissimilar material layer may be an appropriate thickness, but is usually about 10 μm to 2 mm. Examples of the material of the film include polystyrene, polyethylene, polypropylene, polyethylene terephthalate, and polycarbonate.

In the present invention, the sheet laminate is cut under cooling conditions. That is, cutting the surface of the sheet-shaped laminate in advance with a cutting tool, or cutting with a cutting tool while cooling the surface of the sheet-shaped laminate, or pre-cooling the surface of the sheet-shaped laminate The surface of the sheet laminate is cut with a cutting tool while cooling. By doing so, the rise in temperature on the cutting side of the sheet-like laminate is suppressed, whereby melting of the surface of the sheet-like laminate during cutting is suppressed,
Melt adhesion of cutting chips to the surface of the sheet-like laminate is effectively prevented. In addition, when this method is adopted, it is possible to further increase the cutting line speed, and it is possible to obtain the effect of increasing the removal processing efficiency.

In the present invention, various types of cutting tools, such as a rotatable metal brush, a grindstone, a blade, a file, etc., can be used. From the viewpoint of the removal treatment efficiency, a grinding whetstone and a metal brush are particularly preferable. preferable. These shapes and dimensions may be appropriately set according to the structure and dimensions of the sheet-like laminate to be cut.

In the present invention, a cutting tool made of a porous material having a hollow portion and having air permeability can be used as the cutting tool. As a cutting tool in this case, a grinding wheel or the like is preferable. In this case, it is preferable to use a porous body having an open-cell structure. Further, as the material thereof, a sintered metal, a ceramic or the like can be used. When the cutting tool having such a configuration is used to cut the different material layers of the sheet-like laminate while jetting a cooling fluid from the inside of the cutting tool (porous body) toward the surface of the cutting tool (porous body), By the flow of the cooling fluid, a cooling effect is exerted on the cutting tool and the sheet-like laminate, and an effect of efficiently preventing the temperature rise thereof is exhibited. Here, as the cooling fluid, various fluids may be used as long as they provide a proper cooling effect to the cutting tool and the sheet-like laminate during cutting and do not adversely affect the base layer. For example, air, water, nitrogen gas, carbon dioxide gas, or the like can be used. In addition, by the flow of the cooling fluid, cutting chips can be quickly blown off from the cutting tool surface,
Since cutting chips do not accumulate on the cutting tool surface, cutting leakage can be efficiently prevented.

Further, in the present invention, by using the cutting tool having the above-described structure, while forming an air flow from the surface of the cutting tool (porous body) toward the inside of the cutting tool (porous body), the sheet-like laminate is formed. Different material layers may be cut. By doing so, the cooling effect is exerted on the cutting tool and the sheet-like laminate by the flow of air, and there is an effect of efficiently preventing the temperature rise thereof. In addition, by controlling the porosity of the cutting tool, a part or most of the cutting chips can be suctioned and conveyed to a predetermined location through the inside of the cutting tool, and the effect of facilitating the collection of the cutting chips is also achieved.

In the present invention, a cutting tool having a large number of air-permeable holes extending from the inside to the surface of the cutting tool can be used. In this case, any shape, size, number, and intended purpose of the holes can be set as long as the intended purpose can be achieved. Even with such a configuration, it is possible to obtain the same excellent operational effects as when using a cutting tool made of a porous body having air permeability.

Further, in the present invention, after or while spraying a cooling medium onto the surface of the sheet-like laminate to be cut, the different material layers of the sheet-like laminate can be cut and removed. . In this case, as the cooling medium, various ones can be used as long as they provide an appropriate cooling effect to the sheet-like laminate and do not adversely affect the base layer. , Water, nitrogen gas, carbon dioxide gas and the like can be used. In this way, the temperature rise on the cutting side of the sheet-like laminate is extremely efficiently suppressed, thereby suppressing the melting of the surface of the sheet-like laminate at the time of cutting, thereby preventing the fusion of cutting chips to the surface of the sheet-like laminate. Can be prevented. In addition, when this method is adopted, it is possible to further increase the cutting line speed, and it is possible to obtain the effect of increasing the removal processing efficiency. Further, this method can be used in combination with the method described above. In that case, while the melt adhesion of the cut material to the sheet-like laminate surface can be more effectively prevented,
The removal processing efficiency can be further enhanced.

Next, an apparatus for removing layers of a laminate according to the present invention will be described. This removal apparatus processes the same sheet-like laminate as described in the above method. And
At least conveying means for conveying the sheet-like laminate, cutting tools for cutting and removing the different material layers of the sheet-like laminate, and cooling means for cooling the sheet-like laminate, The laminate is cut under cooling conditions.

As the conveying means, various known means capable of conveying the sheet-like laminate to a predetermined processing position,
For example, a transport belt, a transport roller, or the like can be used. Further, as the cutting tool, the same tool as described above can be used. Further, for example, the following can be used as the cooling means. (1) Injecting means capable of injecting the cooling medium as described above (for example, an injection nozzle, a sprayer, a fan, or the like connected to a container or the like containing the cooling medium). This is provided separately from the cutting tool, at a position where the surface to be cut of the sheet-like laminate is pre-cooled or cooled at the same time as cutting. (2) A cutting tool made of a porous body having air permeability and capable of spraying a cooling fluid from inside the cutting tool toward the surface of the cutting tool. (3) A cutting tool having a large number of air-permeable holes formed therein and capable of spraying a cooling fluid from inside the cutting tool toward the surface of the cutting tool. (4) a cutting tool made of a porous body having air permeability, connected to an air suction means (for example, a vacuum pump or the like),
A device that can form an air flow from the surface of the cutting tool toward the inside of the cutting tool. (5) A cutting tool having a large number of air-permeable holes formed therein, connected to air suction means (for example, a vacuum pump, etc.), and adapted to flow air from the surface of the cutting tool toward the inside of the cutting tool. What can be formed. (6) The cutting tool is a wire brush, and a large number of tubes are mixed in the brush. With this tube, a cooling fluid can be sprayed from the inside of the cutting tool toward the surface of the cutting tool, or cutting can be performed. A device that can form an air flow from the surface of the tool toward the inside of the cutting tool.

[0019]

Next, the present invention will be described in more detail with reference to examples, but it is needless to say that the present invention is not limited to these examples, and various modifications and changes can be made.

FIG. 1 is a diagram schematically showing an apparatus for removing layers of a laminate according to one embodiment of the present invention. In the figure, reference numeral 11 denotes a sheet-like laminate, in which a film 13 made of a material different from this is laminated on a base layer 12 made of a thermoplastic resin. Reference numerals 14 and 15 denote feed rollers for transporting the sheet-like laminate 11 to a predetermined cutting position.
8 is a press roller, and 19 is a cutting tool. The cutting tool 19 has a thick cylindrical shape as a whole, and a central portion thereof serves as a rotation shaft, and is connected to a rotation drive mechanism (not shown).
It is preferable that the length in the generatrix direction of the cutting tool 19 is set slightly longer than the width direction of the sheet-like laminate 11. Also,
Cooling nozzles 20 and 21 for ejecting a cooling fluid are installed near the front and rear of the cutting position by the cutting tool 19.

In the above configuration, the feed rollers 14, 1
According to 5, the sheet laminate 11 to be processed is conveyed for cutting. When the portion of the sheet-like laminate 11 to be cut reaches a predetermined position, the cutting tool 19 makes rotational contact and cuts and removes the film 13. At this time, the cooling nozzles 20, 2
A cooling fluid is jetted from 1 to cool the cutting tool 19 and the cut portion of the sheet-like laminate 11 and its surroundings. Therefore, a rise in the temperature of the cutting portion of the sheet-like laminate 11 is suppressed, whereby the melting of the surface of the sheet-like laminate during cutting is suppressed, and the fusion of cutting chips to the surface of the sheet-like laminate is effectively prevented. Will be done. The cutting tool 19 is rotated in the same direction as the holding rollers 16 to 18 (in FIG.
Preferably.

FIG. 2 is a view schematically showing an apparatus for removing layers of a laminate according to another embodiment of the present invention. In FIG. 2, the same elements as those in FIG. 1 are denoted by the same reference numerals. 22 in the figure
Is a cooling nozzle, and 23 is a cutting tool. The entire cutting tool 23 has a thick cylindrical shape, and a central portion thereof is a hollow portion 24. This hollow portion is connected to a cooling fluid supply unit (not shown). In the cutting tool 23, a large number of through holes 25 are formed from the hollow portion 24 toward the cutting tool surface. At the time of cutting, a cooling fluid is ejected to the sheet-like laminate 11 through the through holes 25. Also, the cutting tool 23
Is attached to a rotating shaft (not shown), and the rotating shaft is connected to a rotation driving mechanism (not shown). Cutting tool 2
3 is preferably set to be slightly longer than the width direction of the sheet-like laminate 11.

In the above configuration, the feed rollers 14, 1
According to 5, the sheet laminate 11 to be processed is conveyed for cutting. Before the portion of the sheet-like laminate 11 to be cut reaches the predetermined position, a cooling medium is blown by the cooling nozzle 22 to cool the portion. When the part reaches the cutting position, the cutting tool 23 comes into rotational contact with the film 13.
Cut and removed. At this time, a cooling fluid is ejected from the through-hole 25, and thereby the cutting part of the cutting tool 23 and the sheet-like laminated body 11, and the front and rear thereof are cooled. Therefore,
Combined with the cooling by the cooling nozzle 22, the rise in the temperature of the cutting portion of the sheet-like laminate 11 is suppressed, whereby the melting of the surface of the sheet-like laminate during cutting is suppressed, and the surface of the sheet-like laminate of cutting chips is removed. The melt adhesion to the metal is effectively prevented.

In the embodiment shown in FIG. 2, the cooling fluid is jetted from the through-hole 25. However, the hollow portion 24 inside the cutting tool 23 is connected to a vacuum pump to cut the cutting tool from the surface of the cutting tool. The film 13 of the sheet-like laminate 11 may be cut while forming an air flow toward the hollow portion 24. By doing so, the cooling effect is exerted on the cutting tool 23 and the sheet-like laminated body 11 by the flow of air, and the effect of efficiently preventing the temperature rise thereof is exhibited. In addition, cutting tool 2
By controlling the porosity of the plurality of through holes 25, a part or a large part of the cutting chips can be suctioned and conveyed to a predetermined place through the inside of the cutting tool, and the collection of the cutting chips becomes easy.

[0025]

As described above in detail, according to the present invention, since the above-described configuration is employed, a long-time stable cutting and removing can be performed when cutting and removing a film from a sheet-like laminate. Accordingly, it is possible to provide a method and an apparatus for removing a layer of a sheet-like laminate.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a configuration of an apparatus for removing a layer of a sheet-like laminate according to an embodiment of the present invention.

FIG. 2 is a diagram schematically showing a configuration of an apparatus for removing layers of a sheet-like laminate according to another embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 11 sheet laminate 12 base layer 13 film (different material layer) 14, 15
Feed roller 16-18 Pressing roller 19 Cutting tool 20, 21 Cooling nozzle 22 Cooling nozzle 23 Cutting tool 24 Hollow part 25 Through hole

Continued on the front page F term (reference) 3C021 EA02 3C027 TT03 TT12 4F301 AA12 AA15 AA25 AA26 AD02 BC58 BF03 BF25 BF31 BF32 BF40

Claims (9)

[Claims] 1. A method for removing a layer of a laminate comprising cutting and removing at least one layer of a sheet laminate comprising a plurality of layers including a thermoplastic resin layer using a cutting tool, comprising: A method for removing a layer of a laminated body, comprising cutting under a cooling condition. 2. The method according to claim 1, wherein the cutting tool is made of a porous material having air permeability. 3. The laminate according to claim 1, wherein a number of air-permeable holes extending from the inside of the cutting tool toward the surface of the cutting tool are formed as the cutting tool. How to remove layers. 4. The cutting tool according to claim 2, wherein at least one layer of the sheet-like laminate is cut and removed while jetting a cooling fluid from inside the cutting tool toward the surface of the cutting tool.
Or the method of removing a layer of the laminate according to 3. 5. The method according to claim 2, wherein at least one layer of the sheet-like laminate is cut and removed while forming an air flow from the surface of the cutting tool toward the inside of the cutting tool.
Or the method of removing a layer of the laminate according to 3. 6. After or while spraying a cooling medium on the surface of the sheet-like laminate to be cut.
The method for removing layers of a laminate according to any one of claims 1 to 5, wherein at least one layer of the sheet-like laminate is cut and removed. 7. A conveying means for conveying a sheet-like laminate comprising a plurality of layers including a thermoplastic resin layer, and at least one layer of the sheet-like laminate provided at an appropriate position on a conveying path by the conveying means. A cutting tool for cutting and removing; and a cooling means for cooling the sheet-like laminate, wherein the sheet-like laminate is cut under cooling conditions. Layer removal equipment. 8. The apparatus according to claim 7, wherein the cutting tool is made of a porous body having air permeability. 9. The cutting tool according to claim 7, wherein the cutting tool has a large number of air-permeable holes extending from the inside of the cutting tool toward the surface of the cutting tool. A device for removing layers of a laminate.