JPH01279062A - Fastener and packaging bag with fastener - Google Patents

Abstract

PURPOSE:To obtain a better welding property to various types of laminated base films and make the deployment into special packaging fields possible, by manufacturing a bag main body on which a pair of mutually engaging fasteners, of which at least welded part is made of ionomer resin, have been welded. CONSTITUTION:For fasteners, the whole of fasteners 1, which are composed of a male type fastener 2 and a female type fastener 3, may be formed with ionomer resin, or the male type fastener 2 and the female type fastener may be composed of welded parts 2A, 3B to a bag main body 4 and remaining parts 2B, 3B which include the fastener bodies respectively, and the welded parts 2A, 3A to the bag main body 4 alone may be formed with ionomer resin, and the remaining parts 2B, 3B may be formed with other resin. As an ionomer resin, e.g., a random copolymer between alpha-olefin, such as ethylene, etc. and alpha,beta-unsaturated carboxylic acid or its derivative can be counted. For other resin, low density polyethylene, ethylene-vinyl acetate copolymer, etc. can be counted. A packaging bag with fastener can be obtained by welding the fasteners 1 to the base film 3 of the bag main body 4 by means of heating, high frequency, etc. and then sealing the end part 6.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an articulating device and a packaging bag with an articulating device, which is required to be moisture-proof and oxygen-proof for foods, medicines, etc., and which cannot be resealed after opening. It can be used for packaging in necessary fields.

[Conventional technology]

BACKGROUND ART Bags (zipper bags) that can be opened and closed by providing male and female strip-shaped fittings (fittings) in the opening part of the bag are used in many fields such as food, medicine, and miscellaneous goods. Various methods have been proposed for manufacturing this bag with an interlocking tool.

For example, there is a method in which a cylindrical film equipped with a pair of male and female articulators is integrally extruded using an extrusion die. By heat welding or adhesive to the base film forming the
There are methods of adhesion, etc.

However, the former method has limitations in the types of resins that can be used, and is difficult to apply to multilayer film substrates.
Due to the inability to accommodate a variety of sizes and the difficulty of printing, it is limited to application to general-purpose products that are used in large quantities. For this reason, the latter method has advantages such as being able to respond to diversification by combining the tape with the articulating device and the base film.
It is especially used for packaging in the luxury goods field. However, the materials used for these articulating tapes are only low-density polyethylene (LDPE), polypropylene (PP), polyvinyl chloride (PVC), etc.; Although it is applicable, it cannot be used particularly for metal foil-based mounting bodies, which have been increasingly used recently, and there are significant restrictions on the combinations of material selection, and the disadvantage is that it cannot necessarily be applied to all base films. There is.

In the case of polypropylene, the welding temperature becomes high, causing deformation of the articulating tool and poor appearance of the welded part.
Another drawback is that the bite strength varies depending on the location.

For this reason, for the purpose of improving weldability, some methods use a mixed resin of crystalline propylene copolymer and low-density polyethylene (Japanese Patent Publication No. 59-49249), and others use a multilayer articulating tool (Japanese Patent Publication No. 51-43054). ) etc. are mentioned.

[Problem to be solved by the invention]

In the above-mentioned improved articulating device, since the welding temperature can be lowered, it is possible to prevent deformation of the articulating device and improve the appearance of the welded part to some extent, but in combination with the base film, It is not always possible to freely select the material, and there is no fundamental solution.

An object of the present invention is to provide an articulating device that has excellent weldability to various laminate base films and can be applied to special packaging fields, and a packaging bag in which the articulating tool is welded to the base film. be.

(Means for Solving the Problems) As a result of intensive studies to achieve the above object, the present inventors have found that by selecting a specific resin for the welding part of the articulating device, it can be applied to many laminate films, etc. Easy to weld,
Furthermore, the inventors have discovered that the articulating tool can be stably extruded, exhibiting favorable occlusal strength, and solving the above-mentioned problems, and based on this knowledge, has completed the present invention.

That is, the articulation tool of the present invention is characterized in that the welded part to the main body is made of at least an ionomer resin.

Furthermore, the packaging bag with an interlocking device of the present invention is characterized in that a pair of interlocking interlocking devices, the welded portions of which are welded to the main body are at least made of ionomer resin, are welded to the main body to form a bag. shall be.

The ionomer resin used in the present invention is not particularly limited, but examples thereof include random copolymers, block copolymers, and Examples include graft copolymers with metal ions added thereto. The copolymerization ratio is α-olefin, 99.9~
Examples include 80°0 mol% and 0.1 to 20.0 mol% of α,β-unsaturated carboxylic acids or derivatives thereof.

Among these, an ethylene-based ionomer resin prepared by adding a metal ion having a valence of 1 to 3 to a copolymer of ethylene and an unsaturated carboxylic acid (methacrylic acid) is preferably used. Examples of metals having a valence of 1 to 3 include Na'' and K''.

Examples include Zn~, AI"", etc. Examples of unsaturated carboxylic acids or derivatives thereof include acrylic acid, methacrylic acid,
Unsaturated mono- or dicarboxylic acids such as maleic acid and fumaric acid, or amides thereof.

Examples include esters, metal salts, and acid anhydrides, and these may be used alone or in a mixed system of two or more. Examples of these ionomer resins include Surlyn (trade name) manufactured by DuPont, Hymilan (trade name) manufactured by DuPont Mitsui Polychemicals, and the like.

The melt index (Ml) of the material used in the present invention is:
0.5-20g/10 min, preferably 1-10g/10
minute, with a density of 0.935 to 0.97 g/cm', and preferred metal ions are Na'' and Z~.

The articulating tool of the present invention may be one in which the entire articulating tool 1 consisting of a male articulating tool 2 and a female articulating tool 3 is made of ionomer resin as shown in FIG. ), the male articulator 2 and the female articulator 3 are formed in 211 at the welded parts 2A and 3A to the fitting body 4 and the remaining parts 2B and 3B, which are other parts including the articulating material. However, only the welded parts 2A and 3A to the mounting body 4 may be formed of ionomer resin, and the remaining parts 2B and 3B may be formed of other resin. Other resins include low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, low-crystalline ethylene-α-olefin copolymer, and
Examples include those to which an elastomer or the like is added.

By multilayering the ionomer resin and other resins in this manner, the occlusal strength, unsealability, etc. of the occlusal tool 1 can be adjusted to appropriate values.

In the articulating device of the present invention, the ionomer resin or other resin is optionally modified with an unsaturated carboxylic acid or a derivative thereof, or a mixture of this modified polyolefin and an unmodified polyolefin. You can also add The polyolefin to be modified is not particularly limited, and examples thereof include propylene polymers, ethylene polymers, and the like.

Here, the unsaturated carboxylic acid is acrylic acid.

Examples include methacrylic acid, maleic acid, fumaric acid, itaconic acid, dicrotonic acid, citraconic acid, sorbic acid, mesaconic acid, and angelic acid. Further, its derivatives include acid anhydrides, esters, amides, imides, metal salts, etc., such as maleic anhydride.

Itaconic anhydride, citraconic anhydride, methyl acrylate, methyl methacrylate, ethyl acrylate, butyl acrylate dimaleic acid monoethyl ester, acrylamide, maleic acid monoamide 1 maleimide, N-butyl maleimide 2, sodium acrylate, methacrylic acid Examples include sodium.

The method for modifying polyolefins with these unsaturated carboxylic acids or derivatives thereof is not particularly limited, and various known methods can be used. For example, in the zero reaction that proceeds by adding a radical initiator to polyolefin and maleic anhydride in the presence or absence of a solvent and heating, other vinyl monomers such as styrene or liquid rubber, thermoplastic It is also possible to coexist rubbers such as rubber.

The content of unsaturated carboxylic acid or its derivative in the modified polyolefin thus obtained is usually 0.0
0.01 to 15% by weight, preferably 0.005 to 10% by weight
is within the range of

In addition, the blending amount of this modified polyolefin is 0°OI to 2
The amount should be approximately 0% by weight.

The method for manufacturing the articulating tool made of the ionomer resin of the present invention is not particularly limited, and usually involves extrusion molding by a single extrusion method, coextrusion method, etc. using an extrusion die that is close to the cross-sectional shape of the articulating tool. It can be manufactured by cooling and shaping in water.

Further, the shape of the articulator is not limited to male and female articulators, but can be any known shape as long as it has the function of opening and closing.

Next, as an example of a packaging bag with an articulating device of the present invention, as shown in FIGS. 2 and 3, the articulating device 1 of the present invention is applied to a base film 5 forming a bag body 4 using heat and high frequency.

It can be obtained by sealing the end portion 6 after welding using known means such as ultrasonic waves. At this time, as the base film 5, for example, a metal foil 7 such as an aluminum foil is used.
It may be a multilayer material in which two layers are laminated.

Here, the base film 5 is not particularly limited, such as a single layer film, a multilayer film, a laminate film, etc. The multilayer film laminate film may include an ethylene-vinyl alcohol copolymer having gas barrier properties, a polychloride film, etc. Composite films of metals such as vinylidene, polyacrylonitrile, polyamide, aluminum, and other films are used. Furthermore, it can also be a multilayer material made of other materials such as paper, nonwoven fabric, etc.

These multilayer films and multilayer materials may be multilayers of three or more types of various materials in consideration of the goods to be packaged.

In this case, the layer forming the inner surface of the main body 4 to which the articulation tool 1 is welded may be made of low density polyethylene, ethylene-vinyl acetate copolymer, ionomer resin, etc., and ionomer resin is particularly preferred. In other words, ionomer resin has excellent low-temperature sealing properties, hot sealing properties, oil resistance, and pinhole resistance, as well as excellent adhesion to aluminum in particular.
It is suitable as a packaging bag having an aluminum layer.

The packaging bag using the interlocking tool of the present invention can be welded at low temperatures and has a high welding force (the welding work can be performed efficiently and stably).

[Example] The articulation tool 1 shown in FIG. 1(A) was made of ionomer resin (M
r: 5g/10min, density: 0.94g/cm'.

Himilan AM-6001. It was obtained by extrusion molding using DuPont Mitsui Polychemical (Mitsui DuPont Polychemicals) and cooling with water.

In addition, after the obtained articulating device tape was thermally welded to a base film 5 forming a mounting body 4 made of a multilayer material having a composition of aluminum/ionomer resin (20 μm/20 μm), as shown in FIGS. 2 and 3. A packaging bag with an interlocking tool was obtained. This product could be easily welded and had a very strong welding force, and the articulator had excellent opening and resealing properties and had a good appearance.

(Effect of the invention〕 The articulating tool of the present invention has extrusion moldability and shape stability.

It has moderate and stable occlusal strength, and exhibits high weldability to the base film that forms the housing body, especially to the base film whose inner layer is an ionomer resin that has excellent sealant suitability.

In addition, the occlusal colophon packaging bag using this occlusal device can be completely welded to ionomer resin, which was difficult to weld with conventional polyethylene or ethylene-vinyl acetate copolymer occlusal devices, and has an aluminum layer. It not only makes it possible to provide packaging bags with gas barrier properties, but also exhibits good weldability to low-density polyethylene and the like.

Therefore, it is suitable for various moisture-proof packaging, oxygen-absorbing packaging, desiccation-resistant packaging, food, pharmaceuticals, adhesive medicines (poultices), and other resealing applications, and its practical value is extremely high. It is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the articulating device of the present invention, FIG. 2 is a plan view showing an embodiment of the packaging bag with the articulating device of the present invention, and FIG. It is an enlarged view of the cross section taken along the line ■-■. 1... Articulating tool, 2... Male articulating tool, 2A... Welded part, 2B... Remaining part, 3... Female articulating tool, 3A...
Welded portion, 3B... Remainder, 4... Mounting body, 5... Base film, 6... End, 7... Metal foil. Applicant Idemitsu Petrochemical Co., Ltd.

Claims (2)

[Claims] (1) An articulating device in which the part welded to the bag body is made of at least an ionomer resin. (2) A packaging bag with an interlocking device, which is formed by welding a pair of interlocking interlocking devices, the welded portions of which are welded to the main body at least to the main body and which are made of ionomer resin and which interlock with each other, to the main body to form a bag.