JPH0788068B2 - Method for manufacturing easy-open packaging bag - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing an easily openable packaging bag, which efficiently produces an easily openable packaging bag that can be easily opened.

(Prior art and problem to be solved) Bending a film having a heat-adhesive resin layer on at least one surface so that the heat-adhesive resin layer is on the inside,
It is widely known to heat-bond a peripheral portion to produce a packaging bag.

The packaging bag obtained in this manner is used for various packaging after filling the contents and then thermally adhering and sealing the opening.

However, in order to take out the contents from the packaging bag, it is necessary to tear and cut from the peripheral portion, but the peripheral portion has a drawback that it is extremely difficult to cut and open because it is heat-bonded.

Therefore, various means have been conventionally used to facilitate the opening. For example, a technique is used in which a cut is made in the peripheral portion of the packaging bag, a cutting line is provided in advance from the cut, or a thickness tolerance is given to the surface of the bag. There is also a method in which the end surface of the film is entirely scratched (see, for example, Japanese Patent Publication No. 61-39228).

However, these methods require a step of cutting a part of the film or a part of the peripheral portion of the packaging bag with a knife, a laser or the like in the state of the film before the packaging bag is created or after the packaging bag is created. However, at the time of this cutting, an error is likely to occur in the position of the cut, and if this position deviation occurs, there is a hole in the packaging bag at the cut due to the cut, or the bag is broken during transportation from the part where the cut is made, Alternatively, there are drawbacks such as no break and no easy-opening effect.

The present inventor, as an easily openable packaging bag without such a defect, first deteriorates by heating and pressing a part of the peripheral portion of the packaging bag made of a synthetic resin film obtained by thermally bonding the peripheral portion. As a result, a tear-resistant packaging bag was proposed in which the tear strength is lowered and the tearing strength can be easily opened from that portion (Practical application 1-
See 144941).

The present inventor, about the manufacturing method of this easy-open packaging bag,
The drawbacks of various studies to manufacture more efficiently, the present invention has been completed, and an object of the present invention is to efficiently manufacture an easily openable packaging bag that can be easily opened. Is provided.

(Means for Solving the Problems) The gist of the present invention is to melt a heat-adhesive resin layer by ultrasonic waves or heat in the longitudinal direction of a wide film having a heat-adhesive resin layer on at least one surface, and at the same time to seal a blade. The mold is pressed to form the shape of the seal blade mold, then a film wider than the treated part is cut in the longitudinal direction, and the cut film is bent so that the heat-adhesive resin layer is on the inside. A method for producing an easily openable packaging bag, which comprises heat-bonding the peripheral portion to form a packaging bag.

That is, in the present invention, by using an extruder or the like, at the stage of producing a packaging bag manufacturing film having a predetermined width from a wide film extruded, the sealing blade die is pushed to a predetermined width position of the wide film. The shape of the seal blade die is applied and applied, and the seal blade die is cut in the longitudinal direction from this location. The cut film is used as a packaging bag manufacturing film, bent so that the heat-adhesive resin layer is on the inside, and the peripheral portion is heat-bonded to form a packaging bag. As a result, the packaging bag is deteriorated by heating, and as a result, the obtained packaging bag is easily opened.

The present invention will be described in detail.

The synthetic resin film used in the present invention, at least one surface is a film having a heat-adhesive resin layer such as polyethylene, polypropylene, polyvinyl chloride,
This film may be a non-stretched film or may be stretched, and its thickness is 30 μ to 150 μm.
What is used as a normal wrapping bag film may be used.

The film having a heat-adhesive resin layer on at least one surface obtained by the film manufacturing method is usually a packaging bag film because of its wide width, and thus a slit portion is provided in the longitudinal direction according to a predetermined width of the packaging bag. I have to disconnect.

In the present invention, when a wide film is cut (slit) into a predetermined width of the packaging bag, the cut portion is subjected to a shaping process in the shape of a seal blade, so that it can be easily cut. The process of imprinting into the shape of the seal blade means pressing the seal blade mold against the heat-sensitive film so that the heat-adhesive resin layer having heat-melting property is heated and pressed by the treatment ( It is shaped into the shape of a (blade). As a result, this portion deteriorates due to heat.

As the treatment for heating the film, means such as a heating roll, a heating plate, ultrasonic waves, and high frequency can be applied.

This heat treatment, the material of the film used, varies depending on the thickness is usually 100 to 200 ° C., as the pressurized condition by the seal blade at this time, it is ^{0.5kg / cm 2 ~3kg / cm 2} .
In particular, heating and pressurizing with ultrasonic waves can further enhance the effect. The ultrasonic treatment conditions are 100 to 150 KW, 20 KHz, and 0.2 to 2 seconds.

Next, the obtained film having a predetermined width is bent so that the inner side is a heat-adhesive resin layer, and the peripheral portion thereof is heat-bonded to form a packaging bag.

The present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing the manufacturing method of the present invention. The wide sheet 1 obtained by extrusion molding or the like is provided with a deterioration treatment portion 3 slit portion 2 by performing a molding process in the shape of a seal blade in the longitudinal direction so as to have a predetermined width, and cut from this portion (slit). )
To do. Next, the film 4 cut at the cutting portion (the slit portion 2 in the deterioration treatment portion 3) is bent so that the inside is a heat-adhesive resin layer, and the peripheral portion 5 is heat-bonded to form a packaging bag 6.

Next, the present invention will be described more specifically with reference to Examples.

The tear strength shown in the examples is the tear strength at the slit portion, and the measuring method is to measure the tear strength at an angle of ∠90 ° with a tension shopper.

Example 1 50μ as a thermal adhesive layer on one side of 15μ nylon film
The laminated film made by laminating the polyethylene film is heated by an ultrasonic sewing machine with a maximum output of 150 W and a frequency of 20 kHz, and is passed between a pair of rollers having a serrated blade shape by a gear motor at a speed of 10 meters per minute. The shape was shaped.

Subsequently, the wide film was cut in the longitudinal direction at the part where the patterning was performed, and the resulting cut film having a predetermined width was bent so that the heat-adhesive resin layer was on the inside, and the peripheral portion was heat-bonded. It was a packaging bag. The tear strength of the obtained packaging bag was 90 ± 15 g, indicating easy opening.

For comparison, a packaging bag was prepared in the same manner as above without any treatment of the laminated film, and the tear strength thereof was measured and found to be 1000 g or more.

Examples 2 to 4 Molding was carried out in a blade shape by the same method as in Example 1, and the obtained laminated film was made into a packaging bag by the same method as in Example 1. The tear strength of the packaging bag was measured.
The results are shown in Table 1. For comparison, the values obtained by measuring the tear strength of the packaging bag obtained from the laminated film without any treatment are also shown.

In the table, the thickness of polyester is 12μ, the thickness of nylon is 15μ, and the thickness of vinylon is 15μ, and PE represents polyethylene.

As described above, the portion where the wide film is shaped is cut in the longitudinal direction, the obtained cutting film having a predetermined width is bent so that the heat-adhesive resin layer is on the inner side, and the peripheral portion is heat-bonded. The formed packaging bag exhibited easy opening.

(Effects of the Invention) As described above, in the present invention, when a packaging bag manufacturing film having a predetermined width is obtained, the heat-adhesive resin layer is melted by ultrasonic waves or heat to form a seal blade shape. Since it has been subjected to a patterning process, it can be easily slit into the width of a specified packaging bag, and since the packaging bag is manufactured using this, the packaging bag can be obtained more easily and easily than the conventional case. Since the peripheral edge of the obtained packaging bag is subjected to a molding process in the shape of a seal blade, it can be easily opened.

[Brief description of drawings]

 FIG. 1 is a schematic view of a manufacturing method according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Wide sheet, 2 ... Slit part 3 ... Degradation processing part, 4 ... Film of predetermined width 5 ... Peripheral part, 6 ... Packaging bag

Claims (1)

[Claims] Claim: What is claimed is: 1. A method of forming a sealing blade mold by melting a thermal bonding resin layer by ultrasonic waves or heat in a longitudinal direction of a wide film having a thermal bonding resin layer on at least one surface and at the same time pressing a sealing blade mold. Is shaped, then a film wider than the treated part is cut in the longitudinal direction, the cut film is bent so that the heat-adhesive resin layer is on the inside, and the periphery is heat-bonded to form a packaging bag. The method for producing an easy-open packaging bag, comprising: