JP3243847B2 - Packaging bag with fitting and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag with a fitting and a method for industrially advantageously producing the packaging bag with a fitting, and the obtained packaging bag with a fitting. Is a drug,
Foods, clothing, and other various articles can be freely taken in and out, and can be widely used in the field of resealable packaging bags.

[0002]

2. Description of the Related Art A typical manufacturing method of a packaging bag with fittings currently used is roughly divided into a fitting portion of a male nail and a female nail and a bag body at the same time by a T-die method or an inflation method. A method of forming it into a bag with a fitting, and preforming only the fitting portion, and bonding the fitting to a desired film base material in another step to form a bag with a fitting. It can be divided into two ways.

[0003] The former method is very convenient because a bag material with a fitting can be manufactured at one time, but the type of base material of the bag is greatly restricted from the standpoint of industrial production. For example, it is difficult to manufacture a packaging bag with a fitting provided with a special function such as a gas barrier property by this method. In addition, since there is a difference in the degree of shrinkage between the bag body portion and the fitting portion, the bag portion shrinks and wrinkles around the fitting portion, thereby deteriorating the appearance.
Therefore, it is extremely difficult to print on such a surface.

In the case of the latter method, since a film substrate having a good appearance can be used, there is no restriction in printing or the like. However, the work is complicated and the cost is high.
Moreover, generally manufactured fittings are limited to those made of polyolefins such as polyethylene and polypropylene. Unless special treatment is performed, adhesion to different materials is poor, and the intended purpose is not achieved. I haven't.

Therefore, a method (Japanese Patent Publication No. 50-11827) and an apparatus (Japanese Patent Publication No. Sho 49-11827) for automatically and continuously joining a fitting portion to a previously prepared film substrate while extruding the fitting portion. No. 48033). In the essence of this prior art, it is difficult to satisfactorily adhere the fitting portion to the film base, so that the temperature of the film base must be raised to near its softening temperature. for that reason,
The installation of heating rolls and special heating chambers has been proposed,
Depending on the type of the film substrate, various problems occur at high temperatures, so that the adjustment of humidity is also required. In addition, complicated conditions must be set for cooling, and there are many problems.

[0006]

SUMMARY OF THE INVENTION The present invention overcomes the above-mentioned drawbacks of the prior art, provides excellent adhesion between various film or sheet base materials and a fitting, and provides a fitting with good appearance and printability. The packaging bag, and the packaging bag with the fitting device can be satisfactorily joined to various film or sheet base materials while extruding the fitting portion without using special equipment and complicated processes. It is an object of the present invention to provide an industrially advantageous method of manufacturing a packaging bag with a fitting which can be used.

[0007]

Means for Solving the Problems The present inventors have conducted various studies to achieve the above object, and as a result, by using a specific resin for the fitting portion, the resin can be easily adhered to various base materials. The present inventors have found that a packaging bag with a fitting can be formed, and have reached the present invention.

That is, the present invention relates to a packaging bag with a fitting provided with a pair of fittings comprising a male claw and a female claw fitted to each other in the vicinity of the opening of the bag body. When
0.005 mol% of alpha, fitment, characterized in that it is formed from a terpolymer of anhydride and 10 mol% or less of an unsaturated carboxylic acid ester of β- unsaturated dicarboxylic acids The present invention relates to an attached packaging bag.

Further, the present invention is a film or sheet substrate, of ethylene and 0.005 mol% alpha, beta-unsaturated anhydrides of a saturated dicarboxylic acid and 10 mol% or less of an unsaturated carboxylic acid ester With a fitting tool characterized in that the bottom surface of the male claw portion and the bottom surface of the female claw portion formed by melt molding of the terpolymer are adhered in a molten state to obtain a raw bag, and the raw bag is formed. The present invention relates to a method for manufacturing a packaging bag.

The resin used to make the fitting of the present invention is a terpolymer of ethylene, an anhydride of α, β-unsaturated dicarboxylic acid and an unsaturated carboxylic acid ester. As the anhydride of the α, β-unsaturated dicarboxylic acid as the second comonomer component used for producing the terpolymer, an anhydride of the α, β-unsaturated dicarboxylic acid shown below is preferably used. Can be The α, β-unsaturated dicarboxylic acid has at most 20 carbon atoms, particularly preferably 4 to 16 carbon atoms. In particular, maleic acid, itaconic acid, citraconic acid and 3,6-endomethylene-1,2,3,
Anhydrides of α, β-unsaturated dicarboxylic acids such as 6-tetrahydro-cis-phthalic acid are preferred.

The unsaturated carboxylic acid ester as the third comonomer component includes alkyl (meth) acrylate and alkoxy (meth) acrylate. Of these, alkyl (meth) acrylates generally have 4 to 30 carbon atoms, and especially 4 to 30 carbon atoms.
Twenty are preferred. Representative examples thereof include methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and methyl methacrylate. Furthermore, alkoxyalkyl (meth)
Acrylates usually have at most 20 carbon atoms. Further, an alkyl group having 1 to 8 (preferably 1 to 4) carbon atoms is preferable. Further, an alkoxy group having 1 to 8 (preferably 1 to 4) carbon atoms is desirable. Suitable alkoxyalkyl (meth) acrylates include methoxymethyl (meth) acrylate, methoxyethyl (meth) acrylate, 2-methoxyethyl acrylate, ethoxyethyl acrylate, and butoxyethyl acrylate.

In the terpolymer, the copolymerization ratio of the anhydride of the α, β-unsaturated dicarboxylic acid is generally 0.1.
005 to 3 mol%, particularly 0.05 to 2.5 mol%
Is preferred. If the copolymerization ratio of the anhydride of α, β-unsaturated dicarboxylic acid is less than 0.005 mol%, the polarity becomes insufficient,
Sufficient adhesiveness cannot be obtained. On the other hand, if it exceeds 3 mol%, the production of the terpolymer will be unreasonable, and not only will stable production be difficult, but also the absorption of moisture in the air by the anhydride of the α, β-unsaturated dicarboxylic acid will occur. It is not preferable because foaming or the like occurs during molding.

The copolymerization ratio of the unsaturated carboxylic acid ester, which is the third comonomer component, is usually at most 10 mol%, particularly preferably 0.5 to 5 mol%. When the copolymerization ratio of the unsaturated carboxylic acid ester exceeds 10 mol%, not only the molecular weight and crystallinity of the terpolymer decrease, but also the molding of the fitting portion becomes difficult, and also the fitting strength becomes low. It is not preferable because it decreases. The terpolymer has good extrusion moldability and can easily produce a fitting.

The above-mentioned terpolymer can be used as it is in the fitting portion comprising the male claw portion and the female claw portion according to the present invention, but it is better to use a lubricant together with the terpolymer. This is preferable because the fit between the female and the female nail becomes better. Examples of the lubricant that can be used in the present invention include liquid paraffin, natural paraffin, micro wax, synthetic wax, hydrocarbons such as low molecular weight polyethylene, fatty acids such as stearic acid, stearamide, palmitic amide, methylene bisstearyl amide, Fatty acid amides such as oleic acid amides, lower alcohol esters of fatty acids, esters such as polyhydric alcohol esters of fatty acids, aliphatic alcohols,
Examples thereof include alcohols such as polyhydric alcohols and metal soaps such as calcium stearate. These lubricants can be used alone or in combination of two or more.

The amount of the lubricant used is as follows.
0.01 to 2 parts by weight per 0 parts by weight is preferred. A particularly preferred amount is from 0.03 to 1.5 parts by weight. When the amount of the lubricant used is less than 0.01 part by weight, the effect of improving the fitting property in the case where the male and female claws formed by melting and solidifying immediately after cooling and solidifying is small. On the other hand, when the lubricant is used in an amount of more than 2 parts by weight, the molded fitting becomes white,
It is not preferable because the adhesiveness of the packaging bag to the base material is reduced.

The terpolymer used in the present invention contains, in addition to the above-mentioned lubricant, generally used heat stabilizers, antioxidants, ultraviolet absorbers, antiblocking agents, antistatic agents,
Of course, various additives such as an anti-fogging agent, a flame retardant, and a coloring agent can be blended. Further, depending on the purpose, other resins such as polyethylene, polypropylene, polyvinyl chloride and the like can be partially used in combination.

The shapes of the male claw and the female claw, which are the constituent elements of the fitting portion obtained by molding the terpolymer, are not particularly limited as long as they can perform their functions. 1 and 2 are sectional views of FIG. 1 and 2, the lengths a and a 'of the bottom surface (or bottom plate) of the nail are 2 to 30 mm, preferably 3 to 20 mm, in a state of being adhered to the base material. The thicknesses b and b 'of the bottom surface are 0.04 to 3.0 mm when bonded to the substrate, preferably 0.04 to 3.0 mm.
8 to 2.0 mm. the length of a and a 'is less than 2 mm,
Alternatively, when the thicknesses b and b 'are less than 0.04, the adhesion to the film or sheet substrate is insufficient.
On the other hand, if a and a 'are more than 30 mm, the film substrate will shrink and wrinkle, or the adhesive surface will become messed up, thus impairing the appearance. When the thickness of b and b ′ exceeds 3.0 mm, not only shrinkage and wrinkles are generated on the film base material, but also side sealing at the time of bag making becomes difficult, and productivity is reduced, which is preferable. Absent.

For forming the fitting portion, a mold having a cross section as shown in FIGS. 1 and 2 is used, and a temperature of 100 to 300.degree. C., preferably 130 to 270.degree. Melt molding. When the molding temperature is lower than 100 ° C., not only molding becomes difficult, but also adhesion to a substrate such as a film is reduced. On the other hand, when the temperature exceeds 300 ° C.,
The terpolymer is deteriorated, which is not preferable. In the present invention, when the male and female claws extruded from the mold are in a molten state, the bottom surfaces thereof are brought into contact with the film or sheet base. It is desirable that the time from when the male and female nails exit the mold until they come into contact with the film or sheet substrate be within one second. In order to stabilize the shape of the nail as soon as possible after the contact pressure is applied to complete the bonding, it is particularly preferable to perform forced cooling such as water cooling or air cooling on the nail part. The base material to which the fitting portion is adhered is folded in half, the male claw portion and the female claw portion are fitted to each other, and the end portion is cut to a predetermined width using heat or the like, and the bag for packing with a chuck is provided. It can be.

The base material of the packaging bag that can be used in the present invention includes polyethylene, polypropylene, polyvinyl chloride,
Examples include various synthetic resin films or sheets such as polyester and polyamide, metal sheets or foils such as aluminum, iron, and copper, and paper, cloth, nonwoven fabric, and synthetic paper. These substrates can be used alone, but they can also be used in the form of a composite film or a composite sheet after being multi-layered.

[0020]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

Embodiment 1 A stainless steel rotating roll is installed at a position almost in proximity to the male and female claws attached to the outlet of the extruder. A 50 μm-thick laminated film made of nylon / polyethylene is applied to the roll, and the winding is advanced while being pulled. On the polyethylene side surface of this laminated film, an ethylene content of 96.8 mol%, a maleic anhydride content of 0.9 mol%, a methyl methacrylate content of 2.3 mol%, and an MFR of 8.1 g / 10 Of the ethylene-maleic anhydride-methyl methacrylate terpolymer was extruded through a mold into male and female claws as shown in FIGS. 1 and 2 and pressed. The resin temperature immediately after the extrusion was 210 ° C. The bonded male nail portion and female nail portion were cooled by spraying cooling water from a nozzle.

Not only the appearance of the base material of the obtained packaging bag with the fitting but also the adhesiveness between the base material and the nail portion were extremely good. Further, the fitting property between the male nail part and the female nail part was good.
When the width (a and a ') and the thickness (b and b') of the bottom surface of the chuck portion shown in FIGS. 1 and 2 were measured from the adhered substrate, they were about 7 mm and about 0.3 mm, respectively. Was.

Example 2 To 100 parts by weight of the terpolymer used in Example 1, 0.2 g of stearic acid monoglyceride was used as a lubricant.
Fitted in the same manner as in Example 1 except that 5 parts by weight were blended and that a 10 μm thick degreased aluminum foil was used instead of the nylon / polyethylene laminated film used in Example 1. The parts were glued. The appearance of the obtained packaging bag with the fitting was excellent, and the nail portion and the aluminum foil were extremely strongly adhered. Further, the fitting property between the male claw portion and the female claw portion was extremely good.

Comparative Examples 1-2 In place of the terpolymer used in Example 1, the MFR was 6
A laminated film made of nylon / polyethylene having a thickness of 50 μm (Comparative Example 1) and an aluminum foil having a thickness of 10 μm (Comparative Example 2) were prepared in the same manner as in Example 1 except that a low-density polyethylene of g / 10 minutes was used. ) Was examined for adhesion. Although there was no problem in moldability, good adhesion was not obtained on any of the substrates.

[0025]

As described above, the packaging bag with the fitting according to the present invention has a good appearance of the bag body base material, and has excellent adhesion between the bag body base material and the fitting portion composed of male nails and female nails. In addition, the male claw portion and the female claw portion have excellent fitting properties. In addition, according to the manufacturing method of the packaging bag with the fitting device of the present invention, without using special equipment and complicated steps, while extruding the fitting portion, for various films or sheet substrates. An industrially advantageous packaging bag with a fitting can be manufactured that can be joined.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a male claw of a fitting according to the present invention.

FIG. 2 is a sectional view showing an example of a female nail of the fitting of the present invention.

[Explanation of symbols]

 a, a 'Length of bottom (or bottom plate) of nail b, b' Thickness of bottom (or bottom plate) of nail

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-77841 (JP, A) JP-A-1-255534 (JP, A) JP-A-59-49249 (JP, A) JP-A-3- 176365 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 33/25 B31B 1/90 321 A44B 19/10-19/16

Claims (2)

(57) [Claims] 1. A bag body fitting tool with packaging bag provided if instrument fitted consisting male claw and Mesutsume pair of fitting the mutually near the opening of the fitting member is ethylene and 0.005 ~ 3 mol
% Of anhydride of α, β-unsaturated dicarboxylic acid and 10 %
A packaging bag with a fitting, characterized by being formed from a terpolymer with an unsaturated carboxylic acid ester of not more than 10% by weight. 2. A film or sheet substrate comprising ethylene
When 0.005 mole% of alpha, and anhydrides and male claw portion formed by melting a terpolymer of 10 mole% or less of an unsaturated carboxylic acid ester of β- unsaturated dicarboxylic acids Mesutsume A method for manufacturing a packaging bag with a fitting, characterized in that a bottom surface of the portion is adhered in a molten state to obtain a raw bag, and the raw bag is made.