JP2003094532A - Manufacturing method for easy-to-unseal packaging sack, and easy-to-unseal packaging sack manufactured by the manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of simply manufacturing an easy-to-unseal packaging sack which enables easy formation of a pouring hole having excellent pouring properties shown by opening with fingers and which is prevented from being broken in a packaging process or in a stage of distribution and also is excellent in sanitation. SOLUTION: The easy-to-unseal packaging sack is manufactured by a method wherein a processed part for easiness to unseal is formed at the pouring hole of the packaging sack constituted of a plastic film, by using an optical reflection type printable laser marker.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an easy-open packaging bag having a spout that heat-seals a plastic film and can be easily opened by fingers.
And an easily openable packaging bag manufactured by the manufacturing method.

[0002]

2. Description of the Related Art Since various plastic films which have high tear strength and puncture strength and which are not easily torn by external force have been developed, heat-sealed packaging bags of plastic film are used for various foods, beverages, daily necessities, detergents, pharmaceuticals. It has come to be widely used as a packaging bag for storing the like. In addition, various refill packaging bags have been proposed in which a spout is formed in such a packaging bag to store seasonings for refill, retort food, cosmetics, detergents and the like. In this type of packaging bag, the tear strength of the material is high, so it is difficult to open it by hand.In order to facilitate the opening, the packaging bag is machined with a grindstone, a blade, etc., laser processed, heat processed, or discharged. Various techniques have been proposed for forming easily-opened processed parts such as notches, perforations and thin-walled weakened parts by processing.

However, in a packaging bag in which a notch is formed in the portion to be opened of the packaging bag, chips may be mixed into the packaging bag during the notching process, and the packaging bag is broken from the notch portion during the packaging process and distribution stage. There is also a drawback that the user cuts his hand at the notch. Further, when the easy-open processing part is formed by machining with a grindstone, a blade, etc., there is a problem that shavings and chips are generated and hygiene is applied,
When the perforated easy-opening process is performed, there is a drawback in that the sealing property of the packaging bag is lost and the protective property of the contents accommodated in the packaging bag is significantly reduced. In addition to these machining methods, even when the easy-open processing part is formed by a method such as heat processing or electric discharge processing, strict process control is required at the time of processing, resulting in reduced productivity or There is a problem in the unsealing property such that the unsealing cannot be carried out at a predetermined position, the shape of the spout formed after the unsealing is not stable, and the pouring property of the contents is deteriorated. In the formation of the easy-open processing part by laser processing, the difference in energy absorption characteristics due to the material can be used by using carbon dioxide laser, and stable processing can be obtained relatively easily, but the possible processing pattern is uniaxial. (Linear)
There is a drawback in that the facility load for simultaneously processing a plurality of pieces is large. Further, since processing including intersection and rectangular processing cannot be performed at one time (at one time), there is a problem that the optimum easy-opening processing is limited or productivity is reduced.

[0004]

Therefore, the present invention solves the above-mentioned problems of the prior art, and it is possible to easily form a spout having good spoutability by opening with a finger, and a packaging process. It is an object of the present invention to provide a method for easily manufacturing an easy-open packaging bag that is excellent in hygiene while preventing bag breakage at the distribution stage.

[0005]

The present invention adopts the following constitution in order to solve the above problems. 1. A method for producing an easy-open packaging bag, which comprises forming an easy-open processing portion at a spout using a printable optical reflection type laser marker on a packaging bag having a spout formed of a plastic film. 2. 2. The method for producing an easy-open packaging bag according to 1, wherein the optical reflection type laser marker is a carbon dioxide laser marker. 3. 3. The method for producing an easy-open packaging bag according to 1 or 2, wherein the easy-open processed portion is constituted by parallel linear or broken grooves. 4. The easy-open processing portion is configured by at least one linear or broken groove and at least one linear or broken groove that intersects with the linear or broken groove. 3. The method for producing an easily openable packaging bag according to 1 or 2. 5. The spout has a spherical portion at the tip of the columnar portion, and the easy-opening processed portion is formed closer to the columnar portion than to the boundary between the columnar portion and the spherical portion. A method for manufacturing an easy-open packaging bag. 6. 6. The method for producing an easily-openable packaging bag according to any one of 1 to 5, wherein a tab is formed at the tip of the spout, and the tab is subjected to a non-slip process. An easily openable packaging bag manufactured by any of the manufacturing methods described in 7.1 to 6.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The plastic film constituting the packaging bag according to the present invention is a single-layer film made of a thermoplastic resin having a heat-sealing property, and a thermoplastic resin film having a heat-sealing property is used as an inner layer of the bag. It is possible to use a laminated film having a layer structure of two or more layers in which other films are laminated. Examples of the thermoplastic resin film having heat sealability include polypropylene, propylene-ethylene copolymer, crystalline polybutene-1, crystalline poly-4-methylpentene-1, low-, medium- or high-density polyethylene, and direct polyethylene. Chain low density polyethylene, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ion-crosslinked olefin copolymer (ionomer), etc. Polyolefins; aromatic vinyl copolymers such as polystyrene and styrene-butadiene copolymer; halogenated vinyl polymers such as polyvinyl chloride and vinylidene chloride resin; acrylonitrile-styrene copolymer, acrylonitrile-styrene-butadiene copolymer Nitrile polymers such as coalescing; nylon 6, nylon Plane 66, such as polyamides para or meta-xylylene adipamide, polyethylene terephthalate, polyesters polytetramethylene terephthalate; various polycarbonates; may be mentioned thermoplastic resins such as polyacetal such as polyoxymethylene or the like.

Particularly preferred materials include, for example, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, ethylenically unsaturated. An olefin resin such as an olefin resin graft-modified with a carboxylic acid or an anhydride thereof, an ionomer resin, a polyamide or copolyamide resin having a relatively low melting point or low softening point, a polyester or copolyester resin, or the like is used.

When a laminated film is used as the plastic film forming the packaging bag, the thermoplastic resin film having the above heat sealing property is used as the inner layer of the bag,
A laminated film in which other films are laminated via an adhesive layer as needed is used. As the material for forming the adhesive layer, an adhesive property selected from polyethyleneimine resin, alkyl titanate resin, polyester-isocyanate resin, urethane resin, epoxy resin, polyether resin, olefin resin having polar groups introduced, etc. Use resin.

The film laminated with the heat-sealable resin is not particularly limited, and any of those usually used for packaging bags can be used. As a material suitable for such a film, any of the materials used as the above heat-sealing resin can be used, and a material which is the same as or different from the resin used as the inner layer is appropriately selected. Further, other films such as metal foil of aluminum or the like, paper, cellophane, or the like, or a laminate of these materials and one or more of the above plastic films can be used. In particular, in the case of contents requiring gas barrier properties, a polyvinylidene chloride resin, a saponified EVA resin, a resin layer such as nylon or a cyclic olefin copolymer, a resin layer having a metal oxide vapor deposition film such as aluminum or silicon oxide. It is preferable to use a laminated film containing a metal foil such as aluminum or aluminum. A film made of a foam of various synthetic resins can be used in order to impart heat insulating properties and rigidity to the film constituting the packaging bag, and various synthetic resins such as titanium oxide, calcium carbonate, carbon and other additives can be used. It is also possible to use a film filled with.

The layer structure of the laminated film suitable for forming the packaging bag of the present invention includes biaxially stretched polyethylene terephthalate (PET: outer layer) / unstretched linear low density polyethylene (LLDPE) and biaxially stretched nylon. (Outer layer) / LLDPE (Inner layer), Biaxially stretched PET (Outer layer) / Aluminum foil (Intermediate layer)
/ LLDPE (inner layer), biaxially oriented nylon (outer layer) / aluminum foil (intermediate layer) / LLDPE (inner layer), biaxially oriented PET (outer layer) / biaxially oriented nylon (intermediate layer) / LLDPE (inner layer), 2
Examples include axially stretched PET (outer layer) / aluminum foil (intermediate layer) / biaxially stretched nylon (intermediate layer) / LLDPE (inner layer). For applications that require high temperature treatment such as pressure heat treatment, biaxially oriented PET (outer layer) / aluminum foil (intermediate layer) / unstretched polypropylene (PP: inner layer), biaxially oriented PET.
(Outer layer) / Biaxially stretched nylon (middle layer) / Aluminum foil (middle layer) / Unstretched PP (inner layer), Biaxially stretched PET (outer layer) /
Unstretched PP (inner layer), biaxially stretched nylon (outer layer) / unstretched
PP (inner layer), biaxially stretched nylon (outer layer) / aluminum foil (middle layer) / unstretched PP (inner layer), inorganic oxide deposition Biaxially stretched PET (outer layer) / unstretched PP (inner layer), inorganic oxide deposition Two
A laminated film using unstretched PP as the inner layer, such as axially stretched nylon (outer layer) / unstretched PP (inner layer), can be used. An adhesive layer selected from the above adhesive resins is provided between the layers of these laminated films.

Whether the plastic film has a single layer or a layered structure may be selected depending on the properties of the contents to be filled in the packaging bag. The plastic film can be produced by a usual method such as a casting method, a T-die method, a calender method or an inflation method. The laminated film can be produced by a usual method such as dry lamination of a film formed in advance, coating on a base film, melt coextrusion, or the like.

The present invention is characterized in that a packaging bag having a spout formed of a plastic film is provided with an easily opened portion at the spout by using a printable optical reflection type laser marker. The optical reflection type laser marker operates the focus of the laser by changing the optical axis (angle) of the mirror, and a complicated pattern or pattern can be processed by a simple operation. The type of laser is not particularly limited, but it is preferable to use a carbon dioxide gas laser because it allows selective processing depending on the type of plastic film.

The method for manufacturing the easy-open packaging bag of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan view showing an example of an easily openable packaging bag (standing pouch) manufactured according to the present invention, and FIG. 2 is a partially enlarged view of the packaging bag shown in FIG. 1 near a spout. In addition, FIG. 3 is a schematic diagram showing a pattern of the easy-open processing part formed in the spout. In this packaging bag 1, a bottom folding portion 2 provided at the bottom of the bag is sandwiched between two plastic films forming the front surface and the back surface of the bag, and a peripheral edge portion 3 is heat-sealed. At the end of the upper side of the packaging bag 1, a spout 4 having a tab 6 and an unsealed portion 8 are provided. The unsealed portion 8 is sealed by heat sealing after filling the contents in the packaging bag 1.

Inside the bag of the spout portion 4, an opening assisting mechanism 9 having a spherical tip portion 11 and a columnar portion 12 continuous to the spherical tip portion 11 is provided so that the spout is easily formed when the bag is opened. Bending prevention mechanism 10 that prevents bending at the exit
Are formed by embossing or the like. The unsealing assist mechanism 9 is a swelling portion that swells the laminated film itself forming the packaging bag to the outside of the packaging bag by embossing or the like, and its shape cuts the capsule vertically in half. As in the above-mentioned shape, the tip has a spherical portion 11 obtained by cutting a sphere into quarters, and a columnar portion 12 continuous with the spherical portion 11. In addition, the spout 4 is provided with an easily openable processing portion 5 by a printable optical reflection type laser marker.
Is formed. The easy-open processing portion 5 is formed by 2 to 15 parallel linear grooves as shown in FIG. 3 (A), or one continuous straight line as shown in FIG. 3 (B). It is preferable that the groove is formed by at least one linear groove that intersects the linear groove, or a pattern in which these are combined as shown in FIGS. 3C to 3E. . When the easy-open processing portion 5 is configured by laser processing into one straight groove or one broken groove, the opening property is not always sufficient, and the directionality at the time of opening is also Becomes unstable. On the other hand, when the easy-opening process portion 5 is configured in the above pattern, the opening property and the directional stability at the time of opening are improved, and the bag can be easily opened to a predetermined shape by opening it with a finger. It is possible to form a spout. The pattern forming the easy-open processing part 5 is not limited to that shown in FIG. 3, and it goes without saying that various modifications can be made. In the present invention, in order to form the easy-opening processed portion 5 by using the small-sized and easy-to-operate printable optical reflection type laser marker, the easy-opening processed portion having a complicated pattern as shown in FIG. 3 is provided. It can be manufactured without lowering production efficiency.

The position where the easy-opening process portion 5 is formed is located slightly beyond the columnar portion 12 from the boundary between the spherical portion 11 at the tip of the opening assisting mechanism 9 provided in the bag and the columnar portion 12 continuous thereto. When formed, the spout formed at the time of opening is not crushed and the cross-sectional area and columnar shape required for pouring can be maintained, which is preferable. Further, by providing the bending prevention mechanism 10 adjacent to the opening assisting mechanism 9, it is possible to prevent the vicinity of the pouring opening from bending at the time of pouring the content, and to prevent the pouring property from being lowered. Packaging bag 1
A tab 6 is preferably provided at the tip of the spout 4 to facilitate opening, and the tab 6 is preferably provided with an anti-slip process 7 by embossing, knurling, or the like.

The shape of the packaging bag of the present invention can be arbitrarily selected, and for example, a flat bag having a three-sided seal or a four-sided seal, a standing pouch, a gusset bag, a pillow bag, or the like can be used. Also, as the contents to be stored in the packaging bag,
It is not limited to liquid, and examples thereof include free-flowing powdery or granular seasonings, retort foods, cosmetics and detergents.

[0017]

EXAMPLES Next, the present invention will be further described with reference to examples, but these specific examples do not limit the present invention. (Example 1) As a body material, a biaxially stretched nylon film having a thickness of 15 µm and a linear low-density polyethylene film having a thickness of 130 µm were dry-laminated from the outside through a urethane adhesive to prepare a laminated film. With respect to this laminated film, the tip spherical portion 11 and the columnar portion 12 continuous with the tip spherical portion 11 are provided at a position which becomes the spout portion 4 when it becomes a packaging bag.
The opening assisting mechanism 9 consisting of was formed by the overhanging forming of the laminated film. Next, using a separately prepared bottom material composed of a laminated film of a biaxially stretched nylon film having a thickness of 15 μm from the outside and a linear low-density polyethylene film having a thickness of 130 μm, which is laminated in the same manner as the body material , Height 180 mm, width 130 mm, bottom material folding width 3
A 6 mm self-supporting packaging bag was made. This is an optical carbon dioxide laser marker that can be printed so as to cross the opening assisting mechanism 9 of the self-supporting packaging bag and slightly on the almost boundary line between the spherical portion 11 and the columnar portion 12 from the columnar portion 12. , LP-3 manufactured by Sunkus Co., Ltd.
By forming the easy-opening process part 5 by 6 linear grooves as shown in (A), the easy-open packaging bag 1 as shown in FIG. 1 was produced.

(Embodiment 2) The easy-open processing part 5 is shown in FIG.
An easy-open packaging bag 1 was produced in the same manner as in Example 1 except that it was constituted by a plurality of linear grooves intersecting with one linear groove as shown in (B).

(Embodiment 3) A tab 6 is formed at the tip of the spout 4 of the unsealable packaging bag 1 desired to be manufactured in Embodiment 1 in order to make opening easier, and a laminated film of this tab 6 is formed. By embossing, uneven slip resistance 7
Was applied.

(Reference Example) An easy-open processing part 5 having the same pattern as that of the first embodiment is formed on the spherical portion 11 so as to cross the opening assisting mechanism 9 of the self-supporting packaging bag manufactured in the first embodiment. And the columnar portion 12 on which the easy-open processing part 5 having the same pattern as that of the example 1 was formed.

After filling the contents of the self-supporting packaging bag obtained in each of the above examples with heat sealing and then opening the easy-opening portion 5 with fingers, the packaging bags of Examples 1 to 3 were easily hand-fed. It was possible to open the container, and it was possible to form a spout having a stable shape and good spoutability. On the other hand, in the packaging bag in which the easy opening processing portion 5 is formed on the spherical portion 11 of the opening assisting mechanism of the reference example, the shape of the spout formed after opening is not stable, and the spout diameter becomes small. However, there was a problem that the pourability of the contents became poor. Further, the packaging bag in which the easy-opening process portion 5 is formed on the columnar portion 12 of the opening assisting mechanism of the reference example has a problem that the tip of the opening has no rigidity and tends to be clogged and the pouring property of the contents deteriorates. It was

[0022]

According to the present invention, it is possible to easily form a spout having good spoutability by opening it with fingers, prevent bag breakage during the packaging process and distribution stage, and keep it hygiene. It becomes possible to easily manufacture an easy-open packaging bag having excellent properties.

[Brief description of drawings]

FIG. 1 is a view showing an example of an easy-open packaging bag of the present invention.

FIG. 2 is a partially enlarged view of the easy-open packaging bag of FIG.

FIG. 3 is a schematic diagram showing a pattern of an easy-open processing part formed at a spout of a packaging bag.

[Explanation of symbols]

1 Easy-open packaging bag 2 Bottom fold 3 peripheral part 4 spout 5 Easy opening processing section 6 tabs 7 Anti-slip processing 8 Unsealed part 9 Opening assist mechanism 10 Bending prevention mechanism 11 Ball 12 Column

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koichi Ishizaka             1-8 East Shimotaniya-cho, Tsurumi-ku, Yokohama-shi, Kanagawa             Yoseikan Co., Ltd. Engineering Division Tsurumi Branch Room F term (reference) 3E064 BA21 EA13 EA30 HP02 HP04                       HS05                 3E075 BA47 BA68 BB02 CA01 DB22                       GA02

Claims (7)

[Claims] 1. An easy-open packaging, characterized in that a packaging bag having a spout made of a plastic film is provided with an easy-open processing part at the spout by using a printable optical reflection type laser marker. Bag manufacturing method. 2. The method for producing an easy-open packaging bag according to claim 1, wherein the optical reflection type laser marker is a carbon dioxide laser marker. 3. The method for producing an easy-open packaging bag according to claim 1, wherein the easy-open processing portion is formed by parallel linear or broken grooves. 4. The easy-open processing portion is constituted by at least one straight or broken groove and at least one straight or broken groove intersecting with the straight or broken groove. The method for producing an easily-openable packaging bag according to claim 1 or 2, wherein 5. The injection outlet has a spherical portion at the tip of the columnar portion, and the easy-open processing portion is formed closer to the columnar portion than to the boundary between the columnar portion and the spherical portion. Four
The method for producing the easy-open packaging bag according to any one of 1. 6. The method for producing an easily-openable packaging bag according to claim 1, wherein a tab is formed at the tip of the spout, and the tab is subjected to a non-slip process. 7. An easy-open packaging bag manufactured by the manufacturing method according to any one of claims 1 to 6.