JPH09103996A - Method and device for punching sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device which allow waste sheets to be removed easily and can achieve a stable punching operation in providing small holes in a flexible thermoplastic-resin foam sheet or a laminated sheet comprising a foam sheet at least one side of which is laminated with a thermoplastic- resin film. SOLUTION: A pin 12 having a flat part at its end and heated at its hole- shaping upper part above the melting temperature of a material sheet is used in such a way that the pin 12 is pressed against the material sheet S placed on an elastic plate 22 for passing a pin of rubber or the like through it, to punch small holes through the material sheet S, after which the pin 12 is further pushed in and passed through the elastic plate 22 and the waste sheets punched are removed. Above the pin 12, the inner surfaces of the small holes are heated to the melting temperature of the material sheet or higher, and the waste sheets punched by the pin 12 are sucked by vacuum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching method and punching apparatus for a sheet such as a thermoplastic resin foam sheet.

[0002]

2. Description of the Related Art Conventionally, as a method for making holes in a sheet, there is a method by punching using a punch (for example, Japanese Patent Laid-Open No. 49-891), and a hole is made by using a hot needle. There are methods disclosed in JP-A-4-210399 and JP-A-6-238597.

[0003]

However, the former punching method among these methods has been a problem because the punching waste of the sheet may not be sufficiently removed. In addition, it is difficult to manufacture a tool to be a punching blade in order to make a small hole, especially a small diameter hole having a diameter of 2 mm or less. Further, in the latter method of using a hot needle, since there is no means for positively removing the resin in the processed hole portion, there is a problem that the resin easily adheres to the heated needle that is entirely heated in a molten state. However, it took a great deal of time to remove the resin once attached from the heating needle.

In particular, for a thermoplastic resin foamed sheet whose material sheet is flexible or a laminated sheet in which a thermoplastic resin film is laminated on at least one side of this foamed sheet, small holes of 0.1 to 2 mm, especially When the small hole of 1.5 mm or less is provided, the above-mentioned problems are easily exposed,
The present invention has been proposed for the purpose of providing a method and an apparatus capable of easily removing a sheet waste and realizing stable drilling.

[0005]

In the conventional technique described above, as a method for punching a sheet according to the present invention, which is capable of solving the unsolved problem, as described in claim 1, thermoplastic resin foaming is provided. When forming a small hole in a sheet made of a sheet in which a thermoplastic resin film is laminated on at least one side of a sheet or a foamed sheet, a flat portion is formed at the tip end, and the upper portion for hole shaping is made of a material. Using a pin heated above the melting temperature of the sheet, press the pin against the material sheet placed on the elastic plate for pin penetration such as rubber, punch out small holes in the material sheet, and then penetrate The pin is pushed in, the elastic plate is penetrated to remove the punched sheet waste, and the inside of the small hole is heated above the pin to the melting temperature of the material sheet. It is set to.

According to the above-described method of punching a sheet, even a flexible material sheet made of a thermoplastic resin foamed sheet or a sheet in which a thermoplastic resin film is laminated on at least one side of the foamed sheet is used for punching. , The material sheet is placed on the elastic plate for penetrating the pin such as rubber, and it is pressed by the unheated part of the pin that has a unique tip shape with a flat part at the tip, so cold working It is easy to form small holes by making holes, and the upper part of the pin for hole shaping is heated above the melting temperature of the material sheet, and then the small hole is made by pushing down the pin. Since the inner surface is heated, the holes can be shaped and the small hole shape can be stabilized.

As a punching device for a sheet according to the present invention, as described in claim 2, a material made of a thermoplastic resin foamed sheet or a sheet in which a thermoplastic resin film is laminated on at least one surface of the foamed sheet. A processing device for forming a small hole by penetrating a pin through a sheet, the upper part of the device having a pin for heating and transferring the upper part for hole shaping from a heating means, and a device such as rubber. The elastic plate for penetrating the pin is arranged on the upper surface side, and the lower side of the device has a plate base having a hole at a position corresponding to the pin below the elastic plate. A flat portion is formed, and a vacuum suction means for sheet scraps punched by a pin is connected to the lower side of the plate base.

[0008] According to the above-described punching apparatus, as the apparatus used for carrying out the above-described punching method, the punching of the small holes in the material sheet and the stabilization of the shape of the small holes after the punching are performed. In addition, it is possible to surely remove and collect the sheet waste generated by punching from the pores of the plate base by the vacuum suction means.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing the outline of a punching apparatus, and the apparatus upper and lower parts 1 and 2.
Of these, it is a press type device that can be pressed when one approaches the other. On the upper part 1 side of the apparatus, a heater 10 serving as a heating means and a plurality of pins 12 are provided to hang down from the heater 10 via a heat insulating portion 11. This pin 12 has a shape having a flat portion 12a at the tip thereof, and an upper portion 12b of the pin 12 has a zone of a required length for hole shaping as shown in FIG. The material sheet S is heated to the melting temperature or higher. The tip of the pin 12 may have an edge shape (FIG. 3- (1)) or a slightly chamfered shape (FIG. 3- (2)).

Next, on the lower part 2 side of the apparatus, there is provided a plate base 2 having pores 21 capable of accommodating the sheet waste S'after perforation.
0, and an elastic plate 22 for piercing a pin such as rubber laid on the plate base 20 by utilizing a vacuum suction force described later. Further, the pores 21 of the plate base 20
A vacuum suction means for sucking, removing and collecting the falling sheet waste S ′ is connected to the lower side, and is shown as a connecting portion 23. Besides fixing the position of the elastic plate 22 by this suction force, other fixing means can be adopted.
The above-mentioned elastic plate 22 for penetrating the pin can be penetrated downward when the pin 12 is pressed by utilizing elasticity of rubber or the like. When the pin 12 is withdrawn after the hole is opened, the pin 12 is as close as possible to the original state. It is necessary to be able to return to the state. However, although not shown, the elastic plate 22 may be supplementarily formed with a guide groove for the pin 12 or a very small pinhole. Further, by displacing the elastic plate 22 little by little, the pins 12 are pressed against different positions, so that the service life of the elastic plate 22 can be extended.

The elastic plate 22 need only be replaced against vacuum suction from below, which is convenient. The state of drilling using the above-mentioned drilling device is (1)-
It is shown in (4) and will be explained sequentially. First, the material sheet S is placed on the elastic plate 22 for pin penetration, and the pin 12 on the upper part 1 side is lowered to press the flat portion of the tip end of the pin 12 against the material sheet S (Fig. 2- (1)).

Then, the pin 12 is further lowered, and the pin 12
Is inserted together with the material sheet S into the elastic plate 22 for pin penetration, a hole is made in the material sheet S, and the sheet waste S'is pushed downward, and the pores 21 of the plate base 20 are inserted.
The sheet waste S'is dropped to the bottom (Fig. 2- (2)). Further, when the pin 12 is lowered, the sheet waste S ′ becomes the pores 21.
The portion of the pin 12 having a temperature higher than the melting temperature of the material sheet S of the upper portion 12b for hole shaping heats the inner surface of the small hole h formed in the material sheet S, Immediately after the formation of the holes, the inner surface of the small holes h can be shaped by heating to stabilize the shape (Fig. 2- (3)).

The sheet scrap S'falling through the pores 21
Is sucked and recovered to the outside from the connecting portion 23 of the vacuum suction means connected to the lower portion 2 side (FIG. 2- (4)).
Then, the upper part 1 side rises and the pin 12 passes through the elastic plate 22 for pin penetration and the small hole h of the material sheet S,
It will return to the original position. Examples of the material sheet S used in the practice of the present invention include known foamed sheets such as foamed polyethylene sheets, foamed polystyrene sheets, and foamed polyethylene terephthalate, which are thermoplastic resin foamed sheets, and a thermoplastic resin film on at least one surface thereof. The laminated sheet that is laminated is the target sheet.

Further, as the elastic plate 20 for penetrating the pins, since it is necessary to avoid deformation due to the heater and the pins, in the case of rubber, heat resistant rubber is suitable, and in addition to silicone rubber, fluorine rubber and the like are suitable. However, resins having the same effects as these may be used. Further, the temperature of the heater is 120 ° C. to 180 ° C., but an example is a foamed polyethylene sheet (trade name: Literon manufactured by Sekisui Plastics Co., Ltd.) having a thickness of 0.5 mm to 5 mm formed by double-sided lamination. The following implementation conditions can be illustrated.

Heater temperature: 120 ° C. to 150 ° C. Pin dimension: Diameter 1.2 mm, length 35 mm Pin upper length: 10 cm Pin upper temperature: 110 ° C. Elastic sheet: Silicon rubber 5 mm thick, hardness 50 Plate base Pore: Diameter 5 mm Vacuum degree: 500 mmHg The sheet perforated as described above is used as a delivery sheet for packing vegetables (lettuce, cabbage, etc.), flowers, etc. in cardboard and transporting them. ,
Depending on the type of vegetables and flowers, determine appropriately how many holes to form as ventilation holes and deliver them without losing freshness in consideration of water retention and dry state It is useful for doing.

[0016]

According to the method for punching a sheet of the present invention described above, a flexible material sheet made of a thermoplastic resin foamed sheet or a sheet in which a thermoplastic resin film is laminated on at least one side of the foamed sheet is also used. , A material sheet is placed on an elastic plate for penetrating a pin such as rubber, and is pressed while pressing an unheated tip end with a pin having a unique tip shape having a flat portion at the tip end, Since punching is performed, it is easy to form small holes, and it is not long enough to remove the punched sheet scraps by inserting pins, and the pin tops for hole shaping are heated above the melting temperature of the material sheet. Since the inner surface of the small hole is heated after being perforated, the hole shape can be adjusted and the small hole shape can be stabilized.

According to the hole punching device for a sheet of the present invention, as a device used for carrying out the above-described hole punching method, a small hole punching process for a material sheet,
It is suitable for stabilizing the shape of small holes after removing and scraping the sheet scraps, and sucking and scraping the sheet scraps due to the punching from the pores of the plate base by the vacuum suction means to ensure the recovery. It is possible to realize efficient drilling even if there are a large number of holes without the trouble of mixing the product sheet and adhering to the pins for cleaning.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an apparatus.

2 (1) to (4) are cross-sectional views showing a process of drilling.

FIG. 3 (1) and (2) are front views of the pin.

[Explanation of symbols]

 1 Upper part of device 2 Lower part of device 10 Heater 12 pin 12a Flat part of tip of pin 12b Pin upper part 20 Plate base 21 Pore 22 Elastic plate for pin penetration 23 Connection part of vacuum suction means S Material sheet S ′ Sheet waste h Small holes formed in the sheet

Claims (2)

[Claims] 1. When forming a small hole in a material sheet made of a thermoplastic resin foamed sheet or a sheet in which a thermoplastic resin film is laminated on at least one side of a foamed sheet, it has a flat portion at the tip end, In addition, use a pin whose upper part for hole shaping is heated above the melting temperature of the material sheet, press the pin against the material sheet placed on the elastic plate for pin penetration such as rubber, and press the pin into the material sheet. After punching through the hole, push the pin further, penetrate the elastic plate to remove the punched sheet waste,
A method for punching a sheet, which comprises heating the inner surface of a small hole above the melting temperature of the material sheet above the pin. 2. A processing device for forming a small hole by penetrating a pin into a raw material sheet made of a thermoplastic resin foamed sheet or a sheet in which a thermoplastic resin film is laminated on at least one side of a foamed sheet, An upper part of the device, in which an upper part for heating and transferring heat from the heating means is arranged, an elastic plate for penetrating a pin such as rubber is arranged on the upper side, and below the elastic plate. It consists of the lower side of the device having a pin and a plate base having pores at positions corresponding to the pin, and the pin has a flat portion at the tip, and further, a vacuum for sheet waste punched by the pin. A punching device for a sheet, characterized in that suction means is connected below the plate base.