JPH07119004B2 - Method of perforating through holes in synthetic resin film in composite film of Japanese paper and synthetic resin - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite film obtained by laminating a Japanese paper and a synthetic resin film, and irradiating the composite film with laser beams divided into multiple luminous fluxes and equal outputs, and perforating the synthetic resin film. The present invention relates to a method of punching through holes in a synthetic resin film in a composite film.

[0002]

2. Description of the Related Art Conventionally, lime is often used as a desiccant, especially in a desiccant bag, and this lime is granular quick lime before absorbing moisture, as disclosed in JP-A-63-23936 and JP-A-62-1936. Even a bag made of a resin film with fine holes such as Japanese Patent No. 148246 does not leak. However, since this quicklime becomes fine powder of slaked lime after absorbing moisture, when stored in the bag made of a resin film having fine pores, the slaked lime of fine powder may leak from the fine through holes. For this reason, a composite film is used for this kind of bag, which is made by adhering a synthetic resin having air permeability to a Japanese paper or the like, which has air permeability but does not allow fine powder of slaked lime to pass through, to have a ventilation hole.

A method of forming a through hole in a synthetic resin film in a composite film obtained by laminating a breathable Japanese paper and a synthetic resin having no breathability is disclosed in Japanese Patent Publication No. 54-35534 of the present applicant. Gazette and Japanese Patent Publication Sho 5
9-45512 and the like.

Among these, in Japanese Patent Publication No. 54-35534, heat is applied to a convex roll to bring the convex portions of the roll into contact with the synthetic resin film of the composite film, and the heat of these convex portions penetrates the synthetic resin film. It had a hole.

Further, in Japanese Patent Publication No. 59-45512, a brush roll having needle-like protrusions radially implanted is rotated on a synthetic resin film of a composite film to scrape away the synthetic resin that has been softened by heating, Through holes were formed in the film.

[0006]

[Problems to be Solved by the Invention] Japanese Patent Publication No.
In the case of the convex roll as disclosed in Japanese Patent No. 4 etc., for example, when a heated convex roll is brought into contact with a film having a width of 1 m, the central part of the roll has a high temperature in the width direction and the both ends have a low temperature unevenness. Occurs.

In addition, if the speed of the film flow is not constant with respect to the rotation of the heating roll, the temperature at which the film is wound becomes uneven, and in any case, the through holes may be unevenly formed.

In the case of the needle-like projections implanted in the radial direction of Japanese Patent Publication No. 59-45512, a synthetic resin or the like laminated on a breathable film such as paper or non-woven fabric between the receiving roll and the brush roll is used. Pass the composite film with the impermeable film. Then, the protrusions of the brush roll are brought into contact with this composite film to scrape away the synthetic resin and the like. However, when assembling the brush roll, it is necessary to implant these protrusions one by one in the groove between the ring-shaped holder and the ring-shaped presser plate. The difficult work of projecting from the board was necessary.

Further, in both publications, when the number of holes is changed,
Since rolls have to be manufactured according to the number of holes and replaced each time as needed, there is a problem that the cost is high and the work is complicated.

The present invention is a composite of Japanese paper and synthetic resin, in which the formation of the through holes is uniform, the operation is simple, the cost is not particularly high to change the number of holes, and the work is not complicated. An object of the present invention is to provide a method for punching through holes in a synthetic resin film in a film.

[0011]

In order to achieve this object, the present invention divides a laser beam into multiple beams and equal outputs by an optical carrier such as an optical fiber or an optical cable. Then, the number of divided luminous fluxes can be adjusted, and the distance between the composite film in which the Japanese paper and the synthetic resin film are bonded together and the tip of the light transporting means can be adjusted, and the composite film is irradiated with a laser beam to synthesize the composite film. Perforate a resin film.

[0011]

Operation: The laser beam 1 is divided into multiple light beams and equal output by the light conveying means 2 such as an optical fiber and an optical cable, and the number of these divided light rays 3 is adjustable, and the distance between the tip of the light conveying means 2 is adjustable and the washi paper is used. And the composite film 4 of synthetic resin film is irradiated.

Therefore, since each light beam 3 is divided into multiple light beams and equal output, the energy of the laser beam 1 passing through the optical carrier means 2 such as an optical fiber and an optical cable becomes uniform, and the through holes 5 are formed without unevenness.

Further, since the composite film 4 is irradiated with the distance to the tip of the light carrying means 2 being adjustable, the focal position of the laser beam 1 is variable in the front and back directions of the irradiation surface, and the focus is on the synthetic resin film of the composite film. Can be matched. By doing so, only the synthetic resin film can be melted, and it becomes possible to perforate only the synthetic resin film.

Further, when the number of through holes 5 is changed, it can be easily dealt with by adjusting the number of light beams 3, that is, the number of light carrying means 2.

[0015]

The attached drawings showing an example of an embodiment relating to a through-hole punching method for punching through-holes in a synthetic resin film in a composite film of breathable Japanese paper and non-breathable synthetic resin of the present invention It will be described in detail based on.

FIG. 1 shows a schematic side view of an apparatus used for carrying out the present invention, FIG. 2 shows a schematic perspective view as seen from the same oblique upper side, and FIG. 3 shows a desiccant and a deoxidizer produced by the film of the present invention. It shows a bag for agents and the like.

Reference numeral 1 is a laser beam, which is a beam from a known solid, gas, semiconductor laser or other oscillator.

Reference numeral 2 denotes an optical carrier such as an optical fiber or an optical cable, which transmits multiple beams of light and multiple beams of equal power to the oscillator of the laser beam 1 through an optical branching device (not shown).

Reference numeral 4 is a composite film (laminated paper) obtained by laminating a synthetic resin film such as polyethylene or polypropylene on the surface of Japanese paper. The composite film 4 has a size of, for example, 1 m (width) × 1000 m (length), is unwound from the pay-out roll 7, and is wound to the take-up roll 8 by about 7 mm.
It is wound at a speed of 0 m / min.

Reference numeral 5 is a hole penetrating the synthetic resin film of the composite film 4 and is used as a ventilation hole. This hole 5 divides the laser beam 1 into multiple beams and equal outputs by an optical branching device, and irradiates the composite film 4 in the intermediate portion of the feeding and winding rolls 7 and 8 with each other. Therefore, the synthetic resin film irradiated with the laser beam 1 Is melted by the heat generated. Since the through hole 5 is provided only in the synthetic resin film portion irradiated with the laser beam 1, and the Japanese paper of the composite film 4 has air permeability, this hole 5 can be used as an air hole. However, since this hole 5 is closed with Japanese paper, it does not leak fine powder such as slaked lime.

Further, since the irradiated laser beam 1 is divided into a multi-beam and an equal output, a large number of holes can be formed at one time, and the through-holes 5 to be formed have a constant size and no unevenness.

Further, since the distance between the tip of the light transporting means 2 and the composite film 4 is adjusted so that the laser beam 1 can be emitted.
It is possible to match the focal position of the above with the synthetic resin film in the composite film 4, and the through hole 5 can be formed only in the synthetic resin film.

Further, since the number of each light flux 3 is adjustable, the number of the ventilation holes 5 can be easily changed by increasing or decreasing the number of the light carrying means 2 such as an optical fiber and an optical cable.

Reference numeral 6 is a bag made of the composite film 4 having the through holes 5 and made of a desiccant, an oxygen scavenger, etc., which has appropriate breathability and exhibits good drying and oxygen scavenging effects. is there.

[0025]

The composite film 4 is transferred from the pay-out roll 7 to the take-up roll 8 according to the number of oscillations of the laser beam 1 to about 7
The film can be wound at a speed of 0 m / min, and this type of film can be mass-produced and can be provided at low cost. .

Further, the tip of the light carrying means 2 and the composite film 4
By making the distance to and adjustable, composite film 4
The through hole 5 can be formed only in the synthetic resin film, and the hole can be easily formed without requiring a special device for forming a hole in the synthetic resin film.

Further, by partially blocking the separated luminous flux 3, the number of the vent holes 5 can be freely changed, the operation is simple, and the cost is particularly high when the number of holes is changed. And work is not complicated.

[Brief description of drawings]

FIG. 1 is a schematic side view of an apparatus used to practice the present invention.

FIG. 2 is a schematic perspective view seen from above in the same direction.

FIG. 3 is a perspective view of a bag made of the film of the present invention, such as a desiccant and an oxygen absorber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laser beam 2 Light transport means 3 Luminous flux 4 Composite film 5 Through hole 6 Bag of desiccant, oxygen scavenger, etc. 7 Feeding roll 8 Winding roll

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B32B 31/14 7148-4F // B29K 105: 04 B29L 7:00 9:00

Claims (1)

[Claims] 1. A laser beam is divided into multiple luminous fluxes and equal outputs by an optical carrier such as an optical fiber and an optical cable, and the number of these divided luminous fluxes is adjustable, and a composite film and a light in which a Japanese paper and a synthetic resin film are bonded together. A through hole to a synthetic resin film in a composite film of Japanese paper and synthetic resin, characterized in that the composite film is irradiated with a laser beam so that the distance to the front end of the conveying means can be adjusted, and the synthetic resin film of the composite film is perforated. Perforation method.