JP2000079646A - Method for punching resin sheet and band-like resin sheet product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently form an opening in a thin film with a simple unit by feeding a resin sheet from a feeder, introducing the sheet to a punching unit having a male die and a female die made of high speed steels, punching the sheet to form the opening in the sheet, and winding it. SOLUTION: A mark sensor 50 having a photodetector is provided at an upstream of a punching unit 30. A controller sends a resin sheet feed signal or a feed stop signal to a feeder 20 and sends a resin sheet wind signal or wind stop signal to a winder 40 according to a sense signal from the sensor 50. A resin sheet 1 is conveyed at a suitable timing according to the signals, and the unit 30 continuously punches the sheet in a punching step. Here, a punching die having a male die and a female die made of high speed steels is provided in the unit 30. The sheet 1 formed with an opening by punching is wound by a winder 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip-shaped resin sheet product having a predetermined opening on the surface and a method for punching a resin sheet for continuously forming the opening.

[0002]

2. Description of the Related Art Resin sheets have been used for various purposes. Such a resin sheet is also useful, for example, as a packaging material for foods and other household items.

[0003] A resin sheet as a packaging material has a shape capable of accommodating contents, for example, is formed into a three-dimensional container-like package by combining it with another plastic product or a metal processed product, or is a bag-like product alone. It is molded into a package and used.

[0004] The resin sheet used for the packaging material may be provided with, for example, perforations, cuts, or openings as necessary.

[0005] The perforations or cuts can be formed, for example, by pressing a pressing blade against a strip-shaped resin sheet that moves intermittently. When the perforations or cuts are provided on the resin sheet, the resin sheet can be easily opened by stress such as peeling.

The opening can be formed by, for example, stacking a plurality of resin sheets to form a thickness suitable for punching, and then pressing a pressing blade to punch. According to such a method, it is possible to open a plurality of resin sheets by a single punching. For example, after forming a package, a hole or the like for hooking on a hook of a product display shelf can be formed. Conversely, a sheet having a desired shape can be cut out by punching.

[0007] However, when the conventional punching method is used to punch a thin film such as a resin sheet one by one or one strip-shaped sheet continuously, misalignment and poor opening are likely to occur. It has been difficult to perform efficient and accurate punching.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a method of punching a resin sheet capable of efficiently forming an opening in a thin film such as a resin sheet with a simple device, and a method of punching the resin sheet. It is an object to provide a resin sheet product in which a plurality of openings are formed by a punching method.

[0009]

According to the present invention, first, a feeding step of feeding a resin sheet from a feeding section, and introducing the resin sheet into a punching section having a male mold and a female mold made of high-speed steel, By punching using the male mold and the female mold, a punching step of forming an opening in the resin sheet, and a winding step of winding the resin sheet having the opening formed by a winding section are provided. To provide a method for punching a resin sheet.

[0010] Secondly, the present invention provides a strip-shaped resin sheet product having a plurality of openings punched by a male die and a female die made of high-speed steel.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The method for punching a resin sheet according to the present invention comprises the steps of: feeding out a resin sheet from a feeding portion; and punching out the resin sheet using a male mold and a female mold made of high-speed steel. A punching step for forming an opening and a winding step for winding the resin sheet are provided.

A strip-shaped resin sheet product of the present invention is a resin sheet having openings formed by the above-described punching method, and has a plurality of openings punched by a male die and a female die made of high-speed steel. .

FIG. 1 is a view for explaining the configuration of a resin sheet punching apparatus used in the method of the present invention.

This device is, for example, 80 rolled on a roll.
A feeding section 20 for feeding the strip sheet 1 having a thickness of μm, a male die and a female die made of high-speed steel (not shown) are provided, a punching section 30 for punching the strip sheet 1, and a strip sheet having an opening formed by punching. And a take-up unit 40 for taking up the first unit.

A position detecting mark (not shown) can be provided on the surface of the belt-like sheet 1. The position detection mark has, for example, a predetermined shape at both ends in the width direction of the belt-shaped sheet,
A plurality can be provided at predetermined intervals.

As shown in the figure, a mark detector 50 having a photodetector such as a photoelectric tube or a photodiode is provided upstream of, for example, a punching unit.
A resin sheet unwinding signal or a resin sheet unwinding stop signal can be sent to 0, and a resin sheet unwinding signal or a resin sheet unwinding stop signal can be sent to the winding unit 40. By these signals, the resin sheet 1 is conveyed in a timely manner, and the punching process is continuously performed in synchronization with the timing. That is, in the punching section 30, when the resin sheet 1 moves by a predetermined length according to the interval between the position detection marks, the resin sheet 1 temporarily stops, and the punching is performed at this stop. When the punching is completed, the resin sheet moves again by a predetermined length. By repeating this, punching can be performed continuously at a predetermined position of the resin sheet.

The punching section 30 is provided with a male mold and a female mold made of high-speed steel.

FIGS. 2 and 3 are views for explaining an example of a punching die having a male die and a female die used in the present invention. FIG. 2 is a top view of the punching die used, and FIG. 3 is a sectional view taken along line XX of FIG.

The punching die 12 shown in FIGS. 2 and 3 is provided with a sheet passing groove 17 provided in the horizontal direction and a through hole 22 which is provided perpendicularly to the sheet passing groove 17 and communicates through the sheet passing groove 17. And Furthermore, the punching die 12
Male body 1 having through hole 14 in the upper surface of sheet passage groove 17 and fixed to punching die 12 using fixing screw 13
6, and a male die 31 comprising male teeth 15 which are accommodated in the through hole 14 and are slightly smaller than the through hole 14 and large enough to pass through the through hole 14 are provided. The surface of the through hole 1 having the same size as the through hole 14
9 is provided, and a female die body 18 fixed to the punching die 12 by using a fixing screw 23 is provided.

As the high-speed steel, the male teeth 15 preferably have a Rockwell hardness C scale of 50 to 65, and the female main body 18 has a slightly lower hardness than the male teeth 15, preferably, Rockwell hardness C scale 45
~ 62 are preferably used.

In the apparatus shown in FIG.
The punching die 12 shown in FIGS. 2 and 3 is arranged at a position where an opening is formed in the vicinity of the center in the width direction. This high-speed steel has excellent machinability, and by performing punching using a male mold and a female mold made of this high-speed steel, even if it is a thin film such as the resin sheet 1, misalignment or misalignment can be prevented. An opening can be formed near the center in the width direction of the belt-shaped sheet 1 without causing an opening defect. In addition, a part of the sheet that has become unnecessary after punching is
9 can be easily removed from below.

As the belt-shaped sheet, besides various single-layer resin sheets, a laminated sheet obtained by laminating arbitrary layers selected from a plurality of types of resin layers and metal thin films can be used.
Heat seal layer made of low density polyethylene as an example,
Laminated sheets having an aluminum layer, a printed layer and a surface protective layer are exemplified. Alternatively, the laminated sheet may be further provided with an impact-resistant layer such as a nylon layer.

The thickness of the belt-like sheet is preferably 10 to 150 μm, more preferably 30 to 100 μm.
It is.

By using the method of the present invention, an arbitrary position of such a relatively thin sheet can be easily punched without generating a displacement or a defective opening.

FIG. 4 shows a state of the rolled sheet thus die-cut. As shown in the figure, a plurality of openings 6 having the same size are formed at predetermined intervals in the belt-shaped sheet 1. As shown in the figure, a plurality of position detecting marks 11 having a predetermined shape can be provided at predetermined intervals at both ends in the width direction of the sheet.

An adhesive layer is provided so as to cover the opening on the surface of the strip-shaped sheet 1 punched out as described above.
An adhesive sheet having a size larger than the opening can be attached. At this time, the adhesive layer used can be continuously adhered to and peeled off from at least the belt-shaped sheet, and has an adhesive strength enough to give a sufficient hermeticity at the time of adhesion.

Next, at predetermined intervals, the resin sheet is cut into, for example, a rectangle such that the opening is located substantially at the center, and a back seal is applied to a pair of both ends of each obtained resin sheet. By performing end sealing, it is processed into a bag shape, and a package is obtained.

After introducing the contents into the obtained package,
The contents can be accommodated by performing an end seal on the other open end.

FIG. 5 is a diagram for explaining an example of the structure of the package of the present invention.

As shown in the figure, the package 10 is bag-shaped, and is not shown on the laminated sheet 1 having a heat sealing layer, an aluminum layer, a printing layer and a surface protection layer made of, for example, low-density polyethylene as a resin sheet. It is formed by applying a back seal and an end seal 2, and for example, an oval opening 6 is provided near the center on the opposite surface to the back seal. The adhesive sheet 4 is provided so as to cover the opening 6. Adhesive sheet 4 is at least laminated sheet 1
On the other hand, the bonding strength is adjusted so that continuous bonding and peeling are possible. The user can peel off the adhesive sheet 4 to appropriately take out the contents from the opening 6 and then adhere the adhesive sheet 4 to the resin sheet 1 again to close the package 10.

FIG. 6 is a sectional view showing another example of a punching die usable in the present invention. This punching die 32 is shown in FIG.
3 shows a more preferable example of the punching die shown in FIG. 3, in which the male body 16 and the female body 18 are replaced with the punching body 21 fixed with fixing screws 13 and 23, respectively, and a male body and a female die are provided. It has the same structure as the punching die shown in FIG. 3 except that the punching die main body 60 in which the main body and the punching die main body are integrally formed using high-speed steel is used.

The male and female molds used in the present invention have special specifications for punching thin resin sheets, preferably 10 to 150 μm thick. The male and female molds are formed using high speed steel and the difference in size between the male male teeth and the female through-holes is usually negligible. Therefore, if the alignment between the male mold and the female mold is incorrect, it is difficult to perform good punching. On the other hand, in the blanking die shown in FIG. 6, since the male body, the female body and the blanking body are integrally formed, the male body and the female body are connected as shown in FIG. Compared with the punching die fixed to the punching die body later, the deviation between the through holes 14 and 19 is less likely to occur. For this reason, by using a punching die having a configuration as shown in FIG. 6, it is possible to perform more precise punching for a longer period of time.

[0033]

As described above, according to the present invention,
An opening can be efficiently formed at an arbitrary position of a thin film such as a resin sheet with a simple device.

Further, according to the present invention, a strip-shaped resin sheet having a plurality of openings having a predetermined size at predetermined intervals can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of an apparatus for manufacturing a resin sheet according to the present invention.

FIG. 2 is a top view illustrating an example of a punching die used in the present invention.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a schematic view showing an example of a belt-shaped resin sheet according to the present invention.

FIG. 5 is a view for explaining an example of a package according to the present invention.

FIG. 6 is a sectional view showing another example of the punching die used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Resin sheet 2 ... End seal 4 ... Adhesive sheet 6 ... Opening 10 ... Packing body 12 ... Punching die 14, 19 ... Through hole 15 ... Male tooth 16 ... Male type body 17 ... Seat passing part 18 ... Female type body 20 ... Feeding parts 21, 31 ... Die body 30 ... Punching part 40 ... Winding part 50 ... Mark detector

Claims (8)

[Claims] 1. A feeding step of feeding a resin sheet from a feeding section, introducing the resin sheet into a punching section having a male mold and a female mold made of high-speed steel, and punching using the male mold and the female mold. A punching step of forming an opening in the resin sheet, and a winding step of winding the resin sheet having the opening formed by a winding section. 2. The resin sheet has a position detection mark of a predetermined pattern on the surface thereof, and the feeding-out step and the winding step are performed with a timing according to the pattern of the position detection mark. 2. The punching method according to claim 1, wherein the punching step is performed continuously in synchronization with the timing. 3. The male die is made of high-speed steel, and has a bar-shaped male tooth having a cross-sectional shape corresponding to the opening, and a first through hole having a shape capable of accommodating and penetrating the male tooth. A male body having a second through-hole having a hole shape similar to the first through-hole, and the first and second resin sheets are provided with respect to the male body. A female body arranged at predetermined intervals to form a sheet passing portion for guiding the second through hole, so that the male teeth pass through the first and second through holes. The punching method according to claim 1, comprising: 4. The punching method according to claim 3, wherein the male body and the female body are integrally formed of high-speed steel. 5. A strip-shaped resin sheet product having a plurality of openings punched by a male die and a female die made of high-speed steel. 6. The male die is made of high-speed steel, and has a bar-shaped male tooth having a cross-sectional shape corresponding to the opening, and a first through hole having a shape capable of accommodating and penetrating the male tooth. A male body having a second through-hole having a hole shape similar to the first through-hole, and the first and second resin sheets are provided with respect to the male body. A female body arranged at predetermined intervals to form a sheet passing portion for guiding the second through hole, so that the male teeth pass through the first and second through holes. The strip-shaped resin sheet product according to claim 5, comprising: 7. The strip-shaped resin sheet product according to claim 6, wherein the male body and the female body are integrally formed of high-speed steel. 8. The strip-shaped resin sheet product according to claim 7, further comprising a predetermined pattern of position detection marks on its surface.