JP2001219944A - Easily openable pouch and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for an easily openable pouch, which enables the pouch to be linearly torn off in its lateral direction and which causes no increase of manufacturing cost. SOLUTION: In the manufacturing method for the easily openable pouch 1, circumferential edges of a composite film having two or more layers whose innermost layer consists of a sealant layer are thermally adhered to each other. A linear cut 22 to be formed at least in the outermost layer film is provided in the vicinity of a head of or a bottom of the thermal adhesion parts at the side edges of the composite film, and an I-notch 20 is provided in the thermal adhesion part 12 positioned at one end of or at each of both ends of the cut 22. The notch 20 and the cut 22 are provided by one scanning with one laser in such a manner that a scanning speed is made constant, and a scanning output is made larger at a predetermined part of the I-notch 20 while it is made smaller at a predetermined part of the cut 22, or that the scanning output is made constant, and the scanning speed is made slower at the predetermined part of the notch while it is made faster at the predetermined part of the cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easily openable pouch which is opened by tearing and a method of manufacturing the same, and more particularly to an easily openable pouch which is provided with a notch and a cut for tearing by a laser.

[0002]

2. Description of the Related Art Conventionally, as a container for storing liquids and solids such as foods, pharmaceuticals, and toiletries, a composite or laminated packaging material having a polymer film as a base and a sealant layer as an innermost layer has been used. A three- or four-side sealed laminated packaging bag is known, and its opening (opening) is provided with a V-notch or an I-notch in the side seal portion near the head or bottom, and the bag starts from the notch. The one that opens by tearing the non-adhesive portion in the lateral direction is used in many fields.

However, in the bag provided with only the notch as described above, when the notch is torn in the lateral direction at the time of opening, the notch is not torn linearly in the lateral direction, and the bag is torn in an unintended direction, for example, obliquely. In particular, when the contents are liquid or powder, there is a problem that the contents spill or scatter. As a method for solving such a problem, for example, there is a method in which a slit is formed only on the outermost layer of the laminated packaging material with a laser or a cutter blade on an extension of the V notch.

[0004] However, the above-mentioned slits are formed, for example, when preparing a laminated packaging material, that is, by providing a cutter blade at a position immediately before a nip roller for laminating a base film and a sealant film. The V notch is formed by sealing the laminated packaging material in which the slits are formed as described above to form a bag (before filling the contents) with, for example, a rotary cutter.
It is formed simultaneously with punching and cutting. That is, since the notch slit and the V notch are formed in completely different steps, the V notch and the notch slit often do not coincide on the extension of the V notch, and therefore, when the opening is opened, the slit is linearly torn in a predetermined lateral direction. However, there is a problem that the contents are spilled or scattered due to being torn diagonally.

To solve the above-mentioned problem that the V notch and the slit do not coincide with each other, for example, Japanese Unexamined Utility Model Publication No. Sho 61-662137 discloses a method in which a sealing portion of a three-layer film is formed by sealing the outer edge of the film. , Leaving a non-adhesive film outer edge on the outside, forming a V notch in that portion, and forming a number of slits on an extension of the V notch of the front side film,
There is a sealed bag that can be torn in the direction of forming the slit.

[0006] However, the problem that the opening in the sealed bag is torn in an unintended direction, for example, diagonally, is solved, but the front side (outermost layer) of the multilayer film is solved.
However, a complicated operation or the like for forming a large number of slits in the film is required, and as a result, there is a problem that the manufacturing cost of the sealed bag increases.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to form a film having a heat-adhesive surface on the film. In a pouch in which the contents storage portion is formed by overlapping and thermally bonding the peripheral edge thereof, the pouch can be reliably torn in the intended direction from the thermal bonded portion of the peripheral edge, and the manufacturing cost does not increase easily. An object of the present invention is to provide an openable pouch and a method for manufacturing the same.

[0008]

Means for Solving the Problems In order to achieve the above object in the present invention, first, in the invention of claim 1, a film having a heat-adhesive surface is superposed on the heat-adhesive surface, A pouch formed by thermally bonding the peripheral edge to form a content storage portion, so that the film does not penetrate the film, and a cut by laser processing is formed on the pouch surface so as to extend from the peripheral heat bonded portion to the content storage portion. Provided,
An easy-opening pouch, characterized in that a notch formed by laser processing is provided at at least one end of the cut at a heat-bonded portion which penetrates the film continuously with the cut.

According to the second aspect of the present invention, a pouch is formed by laminating a film having a heat-adhesive surface on top of each other with the heat-adhesive surfaces and heat-adhering the periphery thereof. A cut that does not penetrate the film is provided on the surface of the pouch so as to extend from the peripheral thermal bonding portion to the content storage portion, and the thermal bonding portion located at at least one end of the cut is connected to the cut. A method for manufacturing an easy-opening pouch having a notch penetrating through the film, wherein the notch and the notch are provided by one scanning with one laser. is there.

According to a third aspect of the present invention, in one scanning by the laser, the scanning speed is made constant, and the output is made large in a portion to be notched and small in a portion to be cut. And a method for producing an easy-opening pouch.

Further, in the invention of claim 4, the scanning output is made constant in one scanning by the laser, and the scanning speed is made slower in the notch-scheduled portion and made faster in the cut-scheduled portion. And a method for producing an easy-opening pouch.

According to the first, second, third or fourth aspect of the present invention, the notch and the notch are formed by one scanning with one laser only by adjusting the speed and output, so that the formation is not complicated. Therefore, the manufacturing cost is not bulky, and since the notch obtained and the notch are surely linearly matched, a method of manufacturing an easy-opening pouch that can be surely torn in the intended direction when the tear is started from the notch is provided. Can be provided.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in the plan view of FIG. 1, the easy-opening pouch of the present invention has, for example, a four-sided seal in which the inner surface of the periphery of a square composite film (10) having two or more innermost layers of a sealant layer is thermally bonded. A pouch (1) of the type wherein a horizontal linear cut (22) is provided in the outermost film by laser processing near the head of the thermal bonding portion (12) on the side edge thereof, and the cut (22) Is an easy-opening pouch provided with an I notch (20) at one end by laser processing. In addition, the method for manufacturing an easily openable pouch according to the present invention uses the I notch (20) and the linear cut (22).
Is provided by one scanning with a laser.

The I-notch (22) may be provided at both ends of a linear cut (22) provided from the thermal bonding portion (12) on the side edge to the content storage portion (30). Further, the I notch (20) and the linear cut (22) may be provided near the bottom of the thermal bonding portion (12) on the side edge, and may be provided near both the head and the bottom. .

The surface on which the straight cuts (22) are made may be only one surface of the four-side seal type pouch, but as shown in FIG. 3 as a BB sectional view of FIG.
The incision (22) by the laser is formed on the front side (1a) of the four-side seal type pouch (1) and the incision (2)
It may be provided on the back side surface (1b) in register with 2). By providing the front and rear sides (1a, 1b) in this manner, a straight opening can be more easily formed.

The shape of the easy-opening pouch according to the method of manufacturing the easy-opening pouch of the present invention is such that the easy-opening pouch (1) shown in FIG. The pouch (not shown) of the three-way seal type in which the composite film (10) is bent may be used.

Further, as another shape of the easy opening pouch of the present invention, as shown in the plan view of FIG. 2, for example, a protruding non-adhesive portion ( There is a liquid refill container (2) provided with 17) and serving as a liquid outlet. In the case of this liquid refill container (2),
An easily openable pouch in which a linear cut (22) is provided horizontally in the outermost layer film of the head thermal bonding portion (16) and an I notch (20) is provided at one end of the cut (22). Good. The liquid refill container (2) of FIG. 2 uses a bottom member (18) made of a two-fold film at the bottom.
It is a so-called standing pouch shape.

As shown in FIG. 3 as a sectional view taken along the line BB of FIG. 1, the shape of the cuts (22) is, for example, the outermost base film (10a) and the innermost sealant layer (10b). In the case of the composite film (10) comprising, the depth of the cut (22) may be such that it penetrates the base film (10a) on the surface of the composite film (10), and does not penetrate the innermost sealant layer (10b). I have to do it. Therefore, as the composite film (10), the base film (10a) and the innermost sealant layer (10)
A multilayer film including a barrier layer or the like is more preferable because the cut (22) can be easily controlled.

Examples of the easily openable pouch (1) of the present invention include, in addition to the composite film (10), a heat-adhesive film alone, or a heat-sealable film having a heat-seal lacquer applied to the surface of the film. Any material having a heat-adhesive surface can be used.

In the present invention, the I notch (2
0) and the notch (22) are provided in the horizontal direction with respect to the outer shape of the pouch as in the above-described case, and are also provided in such positions and directions as to cut off the upper corner portion of the pouch and the deformed seal portion sealed in a nozzle shape. You can also
For example, the embodiment shown in FIG. 4 is provided with an I notch (20) and a notch (22) so that the upper corner of the square pouch can be cut off diagonally. As described above, the notch and the cut of the present invention may be provided at a position where the content can be taken out if the pouch is opened along the cut from the thermal bonding portion to the content storage portion and the pouch is opened along the cut.

The cut (22) according to the present invention.
Is usually linear, but may have a curved or bent portion as needed as long as the tearability is not significantly impaired.

Examples of the laser used for producing the easy-opening pouch of the present invention include, among lasers used for laser processing, a continuous or pulsed carbon dioxide gas laser, a YAG laser, an excimer laser and the like. Can be

Among the above lasers, a carbon dioxide laser having a wavelength of 10.63 μm (infrared ray), in which the base film as the outermost layer as a packaging material is absorbed by a transparent polyethylene terephthalate, stretched nylon film, polycarbonate film or the like, is preferred. Can be used. That is, the light of the carbon dioxide laser is condensed by a condensing lens and is irradiated on the film surface, thereby generating heat on the irradiated portion of the film,
The film surface is removed by melting, decomposition, incineration, etc., and the cut is made according to the degree of the removal (22).
Alternatively, an I notch (20) can be formed.

Hereinafter, a method for producing an easily openable pouch of the present invention using the above-described carbon dioxide laser will be specifically described.

For example, as shown in the side sectional view of FIG. 3, a biaxially stretched nylon film having a thickness of 20 μm is used as a base film (10a), and a low density polyethylene film having a thickness of 60 μm is used as a sealant layer (10b). The sealant layer (10) of the composite film (10) obtained by laminating the film via an adhesive for dry lamination
b) Taking the case of a pouch sealed with comrades as an example, FIG.
As shown in the plan view of the I notch (20) scheduled portion of the head near the heat-bonded portion of the side edge of the pouch (12), at the output 150 W, spot based 120μ in repeated 10KH _Z
m of carbon dioxide laser light. At this time, an I notch (20) is formed at a scanning speed of the carbon dioxide laser beam of about 25 m / min. Subsequently, when scanning is performed at a scan speed of about four times that of the cut (22), that is, about 100 m / min, only the outermost base film (10b) on the pouch surface is removed as shown in FIG. 22) is formed. Further, as shown in FIG. 3, for example, the formation of the I notch (not shown) in the case where the cut (22) is made also from the back surface of the pouch is performed by setting the scanning speed on the front and back surfaces to about 50 m / min, which is twice that of this. It would be good.

According to the present invention, as described above, the scanning output is made constant in one scanning by the laser, and the scanning speed is made slower in the notched portion and faster in the notched portion, so that the notch and the notch are aligned. Thus, both can be surely linearly matched.

Also, in the present invention, the notch and the cut are formed in a straight line by making the scanning speed constant in one scan by the laser, and making the output large in the notch planned portion and small in the cut planned portion. Therefore, both can be surely linearly matched.

[0028]

As described above, the present invention has the following effects. That is, a film having a heat-adhesive surface, a pouch forming a content storage portion by laminating the heat-adhesive surfaces together and heat-adhering the periphery thereof, and from the peripheral heat-adhesion portion. A notch that does not penetrate the film is provided on the pouch surface so as to straddle the content storage portion, and a notch that penetrates the film continuously to the notch is provided in the thermal bonding portion located at at least one end of the notch. In the production of the openable pouch, the notch and the notch can be formed in one scan by one laser, so that the notch and the notch can be surely formed in a straight line. An easily openable pouch that is torn linearly in the lateral direction to easily and reliably open an opening and a method of manufacturing the same can be provided.

In one scanning by the laser, the scanning speed is made constant, and the output is made large in the portion to be notched and reduced in the portion to be cut, or the scanning output is made constant and the speed is made to be the notch. So late
The notch and the notch can be formed in a straight line by adjusting the conveying speed of the packaging material or pouch to be irradiated and the output of the laser so that the notch will be made faster so that production is complicated. And a production method of an easy-opening pouch without production cost.

Accordingly, the present invention relates to an easily openable pouch which is opened by tearing in a packaging bag based on a polymer film which contains, in particular, liquids, powders and the like, such as foods, medicines and toiletries, and a method for producing the same. It has excellent practical effects.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a form of an embodiment of an easy-opening pouch according to the manufacturing method of the easy-opening pouch of the present invention in a plane.

FIG. 2 is an explanatory view showing a form of another embodiment of the easy-opening pouch according to the manufacturing method of the easy-opening pouch of the present invention in a plane.

FIG. 3 is a cross-sectional view taken along the line BB of FIG. 1, showing an embodiment of an easy-opening pouch of the present invention.

FIG. 4 is a partial plan view for explaining another embodiment of the easy-opening pouch of the present invention.

[Explanation of symbols]

 1. Four-side seal type easily openable pouch 1a Front surface of pouch 1b Back surface of pouch 2 Refill container for liquid 10 Composite film 10a Base film 10b Sealant layer 12熱 Thermal bond at the side edge 14 熱 Thermal bond at the bottom 16 熱 Thermal bond at the head 17 非 Non-adhesive part 18 ‥‥ Bottom member 20 ‥‥ I notch 22 ‥‥ Cut 30 ‥‥ Contents Storage section

Claims (4)

[Claims] 1. A pouch comprising a film having a heat-adhesive surface, wherein the heat-adhesive surfaces are overlapped with each other, and the peripheral edge thereof is thermally bonded to form a content storage portion. Provide a cut by laser processing on the pouch surface so as not to penetrate the film, so as to extend from the bonded portion to the content storage portion, and to the thermal bonded portion located at at least one end of the cut, the film is continuously connected to the cut. An easy-opening pouch having a notch formed by laser processing that penetrates the pouch. 2. A pouch in which a film having a heat-adhesive surface is superposed on the heat-adhesive surfaces and the peripheral edge thereof is thermally bonded to form a content storage portion. A cut that does not penetrate the film is provided on the pouch surface so as to extend from the adhesive portion to the content storage portion, and a notch that penetrates the film in a continuous manner with the cut is formed in the thermal bonding portion located at at least one end of the cut. A method for manufacturing an easily openable pouch provided, wherein the notch and the notch are provided by one scanning with one laser. 3. A method for manufacturing an easy-opening pouch according to claim 2, wherein the scanning speed is made constant in one scanning by the laser, and the output is made large in the portion to be cut and small in the portion to be cut. . 4. A method for manufacturing an easy-opening pouch according to claim 2, wherein the scanning output is made constant in one scanning by the laser, and the scanning speed is made slower in a portion to be notched and faster in a portion to be cut. .