JP2002362661A - Material and method for packaging hot melt adhesive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material of a hot melt adhesive with high workability during the service, and free from any influence on the heating stability, and the adhesivity and viscosity without any blocking during the storage, and a packaging method of obtaining the packaging material with excellent productivity. SOLUTION: The packaging material 1 is formed of a material which is not melted at the melting point, and the inner surface thereof has releasability. Solid materials 3b and 3b' of the hot melt adhesive are packaged by the packaging material 1 so as to be covered by a thermoplastic film 2 which is melted at the melting point of the hot melt adhesive at least in a part of the entire surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot melt pressure sensitive adhesive package and a packaging method.

[0002]

2. Description of the Related Art Conventionally, a hot-melt pressure-sensitive adhesive, particularly a pressure-sensitive hot-melt pressure-sensitive adhesive, is filled in a molten state into a packaging material such as a packaging film or a container whose inner surface has been release-molded, cooled, solidified, and packed. Was like that.

[0003] However, in this packaging method, when the hot melt adhesive is taken out of the packaging material, there is a problem that the hot melt adhesive adheres to the hand due to the tackiness and is difficult to remove from the packaging material. . In the case of a hot-melt adhesive having strong adhesiveness, there was also a danger that the skin of the hand would come off.

[0004] In order to prevent the above-mentioned problems from occurring, there has been proposed a method in which a packaging material is melted and used together with a hot melt adhesive.

[0005] For example, a pillow packaging method has been proposed in which a hot melt adhesive and a non-adhesive film are co-extruded. However, according to this method, since the end of the pillow is open and the adhesive remains there, there is a problem that the pillow packaged product is blocked during storage and becomes difficult to remove from a cardboard or the like. The non-adhesive film as a packaging material is a foreign substance to the hot-melt adhesive and is hardly compatible with the hot-melt adhesive. There is also a problem that the adhesiveness of the agent is adversely affected. In general, since the softening point of the non-adhesive film is higher than the softening point of the hot melt adhesive, during use, when the hot melt adhesive is remelted, it is difficult to uniformly melt and mix the two, and the heat stability is deteriorated. There was also a possibility that problems such as nozzle clogging and poor adhesion due to reduced adhesiveness and tackiness would occur. If agitation or the like is performed to uniformly melt, there arises a problem that the production efficiency is reduced.

[0006] Japanese Patent No. 254327 discloses a method for preventing the end face blocking in the pillow packaging method.
Japanese Patent Publication No. 3 (1994) proposes a method of wrapping a solidified block of a hot melt adhesive with a plastic wrapping sheet such as a thermoplastic film. In this method, a hot-melt pressure-sensitive adhesive is solidified in a mold, a solidified material of the hot-melt pressure-sensitive adhesive is obtained in advance, and the solidified material is removed from the mold and wound around a plastic packaging sheet. In this method, since the plastic packaging sheet is wound around the solidified hot-melt adhesive obtained in advance, it is impossible to prevent air from entering between the solidified substance and the packaging sheet. When re-melting the solidified hot-melt adhesive, the presence of the air layer makes it difficult for the hot-melt adhesive to melt uniformly, and also causes a coating error such as splash due to the entrapped air. Sometimes. Plastic packaging sheets have poor compatibility with hot melt adhesives.
It is difficult to uniformly melt at the time of the re-melting, and problems such as nozzle clogging due to deterioration in heating stability and poor adhesion due to a decrease in adhesiveness and tackiness occur. Furthermore, there is also a problem that the plasticizer and the like contained in the hot melt adhesive bleeds over time on the outer surface of the plastic packaging sheet, and the hot melt adhesive packages are blocked during storage.

On the other hand, Japanese Patent No. 2690400
In the packaging method disclosed in the above publication, a hot-melt adhesive melted at a temperature higher than the melting point of the thermoplastic film is injected into a mold lined with a thermoplastic film, and solidified. I try to wrap it. Therefore, in this method, the problem of air mixing is solved, but it is necessary to forcibly cool the mold in order to prevent melting and deterioration of the thermoplastic film at the time of injecting the hot melt pressure-sensitive adhesive. ineffective. Also in this method, the plasticizer contained in the hot melt adhesive bleeds over time on the outer surface of the thermoplastic film, and the hot melt adhesive packaged product blocks during storage, and paper dust and dust in the cardboard case are stored. However, there is a problem that such as adheres to the hot melt adhesive package.
In this method, the hot melt adhesive is filled into the thermoplastic film at a high temperature, so that the plasticizer and the like are more likely to bleed on the outer surface of the thermoplastic film. If the thickness of the thermoplastic film is increased or the compatibility is reduced in order to suppress bleeding of the plasticizer, etc., the thermoplastic film and the hot melt adhesive will be uniformly mixed without sufficient stirring during remelting. However, similar to the above-described methods, problems such as nozzle clogging due to deterioration in heating stability and poor adhesion due to deterioration in adhesiveness and tackiness occur. On the other hand, if the pressure-sensitive adhesive is cold-flowing, the pressure-sensitive adhesive flows out unless a process such as heat sealing the end of the thermoplastic film is performed, and in this case, blocking occurs.

[0008] In summary, the above-mentioned various packaging methods of melting a packaging material together with a hot-melt pressure-sensitive adhesive all have poor workability during use, occurrence of blocking during storage, adhesion of the packaging material to hot-melt pressure-sensitive adhesive. With the problem of deterioration in heating stability and decrease in adhesiveness and tackiness during re-melting resulting from low compatibility with the agent, after all, the conventional method described above, that is, the packaging material does not melt, It was no better than just packing.

[0009]

The problem to be solved by the present invention is to improve the above-mentioned conventional method, in which the solidified hot-melt adhesive is removed from the packaging material by hand without danger. A hot melt adhesive package that can be easily taken out, does not block during storage, and has no effect on heating stability and adhesiveness / adhesiveness during use. An object of the present invention is to provide a method for packaging a hot melt adhesive to be produced.

[0010]

The present inventor has conducted various studies to solve the above-mentioned problems, and as a result, as a hot-melt adhesive packaging material, a material which does not melt at the melting temperature of the hot-melt adhesive is used. Use a packaging sheet that has a releasable inner surface and the solidified hot-melt pressure-sensitive adhesive obtained by filling and solidifying the packaging material is used to melt the hot-melt pressure-sensitive adhesive on at least a part of its entire surface. The idea was to wrap in the wrapping sheet through a thermoplastic film that melts at temperature. And if it is wrapped in a strong packaging sheet instead of a thermoplastic film, blocking during storage will not occur, and the packaging material will not be melted, so there is little effect on heating stability and adhesion / adhesion. In addition, a serious problem in the conventional method, that is, when the hot melt adhesive is removed from the packaging material by hand, that the hot melt adhesive adheres to the hand and is difficult to remove from the packaging material, The present invention was completed by confirming that danger such as peeling of the skin could be prevented by the worker's hand coming into contact with the solidified hot melt adhesive through the thermoplastic film.

That is, in the package of the hot-melt pressure-sensitive adhesive according to the present invention, the solidified product of the hot-melt pressure-sensitive adhesive obtained in the packaging material by filling and solidifying the packaging material has at least a part of its entire surface. The hot-melt pressure-sensitive adhesive is covered with a thermoplastic film that melts at the melting temperature, is made of a material that does not melt at the melting temperature, and has an inner surface wrapped in a packaging sheet having releasability.

The method for packaging a hot-melt adhesive according to the present invention is a method of wrapping a hot-melt adhesive in a packaging material, wherein the packaging material is made of a material that does not melt at the melting temperature of the hot-melt adhesive. While using a packaging material having a releasable inner surface, a thermoplastic film that melts at the melting temperature of the hot melt adhesive is superimposed on the inner surface of the packaging material, and is placed in a recess of the packaging material. The method is characterized in that a melt of the hot melt adhesive is filled, the melt is cooled and solidified in a depression, and the solidified hot melt adhesive is wrapped in the packaging material.

[0013]

FIG. 1 (c) shows an example of a package of the hot melt adhesive according to the present invention, and FIG. 2 (d).
Shows another example. In these packages 4, 4 ', a thermoplastic film 2 in which solidified products 3b, 3b' of a hot-melt adhesive obtained by filling and solidifying a packaging material are melted on the entire surface at the melting temperature of the hot-melt adhesive. And the inner surface thereof is packaged with a sheet-like packaging material 1 having a mold releasability and having a material that does not melt at the melting temperature.

In the package of the hot-melt pressure-sensitive adhesive according to the present invention, the thermoplastic film 2 is formed on the entire surface of the hot-melt pressure-sensitive adhesive solidified material 3b, 3b 'as shown above.
3b ', when unpacking, but not part of, covering the hot melt adhesive solidified material 3b'
What is necessary is just to cover the surface which contacts b, 3b '. However, as shown in these figures, if the thermoplastic film 2 has the same shape and the same size as the sheet-like packaging material 1, for example, the two can be integrated by a laminating method or the like. It is not necessary to say that the thermoplastic film 2 is superimposed on the sheet-like packaging material 1 and the thermoplastic film 2 does not peel off from the sheet-like packaging material 1, so that the workability is extremely good.

In the present invention, the shape and structure of the packaging material are not limited to the sheet shape as described later.

The method for packaging a hot-melt pressure-sensitive adhesive according to the present invention is a method of wrapping the hot-melt pressure-sensitive adhesive in a packaging material to obtain the above-mentioned package with high productivity.

In the following, first, a hot-melt pressure-sensitive adhesive packaged by the method of the present invention will be described, and then a packaging material used for packaging the same and a thermoplastic film to be superimposed on the packaging material will be described. A packaging method using these will be described. (Hot Melt Adhesive) It can be said that the present invention can be applied to packaging of virtually any kind of hot melt adhesive, but a hot melt adhesive used for sanitary materials such as disposable diapers and napkins having high adhesiveness and blocking property. Especially effective for packaging.

Examples of the hot-melt pressure-sensitive adhesive to which the present invention is applied include, as base polymers, styrene-butadiene-styrene block copolymers, styrene-isoprene # styrene block copolymers, and styrene-based copolymers such as hydrogenated products thereof. Block copolymer (SBC), EV
A, ethylene-unsaturated carboxylic acid copolymers such as EEA, polyolefins such as APP and APAO, polyisobutylene, polybutene, polyurethane, polyester,
A hot melt adhesive containing a resin such as polyamide or polyacryl as an adhesive component can be used.

In most cases, a tackifying resin is blended in the hot melt pressure-sensitive adhesive in order to improve adhesiveness and to impart tackiness. Examples of the tackifying resin include (a) natural and modified resins, (b) polyterpene resins, (c) phenol-modified hydrocarbon resins, (d) cumarone-indene resins, (e) aliphatic and aromatic petroleum hydrocarbon resins, (F) phthalate ester and (g)
Examples include hydrogenated hydrocarbons, hydrogenated rosins and hydrogenated rosin esters.

Other additives other than the above include plasticizers such as oil, liquid paraffin, liquid polybutene and polyisobutylene, paraffin wax, microcrystalline wax, stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, coloring agents Agents, fillers and the like. (Wrapping Material) The wrapping material used in the present invention is a wrapping material made of a material that does not melt at the melting temperature of the hot-melt pressure-sensitive adhesive, and whose inner surface has releasability.

The inner surface of the packaging material has releasability, so that the solidified hot melt can be easily peeled off from the packaging material, and the workability during use is good.

Since the packaging material used is not compatible with the hot melt adhesive or has a large thickness, bleeding of the plasticizer contained in the hot melt adhesive does not occur. Thereby, blocking of the package can be prevented.

Examples of the packaging material include not only a flat body such as a sheet (including a film), but also a shape such as a container (having an opening). However, when carrying out the packaging method of the present invention, it is convenient and preferable to use a sheet-like packaging material.

The material of the packaging material is not particularly limited, and examples thereof include polyesters such as PET and BET, and resins such as polyamide, polypropylene, PES, and Teflon (registered trademark). As a material of the packaging material, a resin having a melting point higher than the melting temperature of the hot melt adhesive is preferable.

As described above, at least the surface (inner surface) of the packaging material which is in contact with the hot melt adhesive has a releasability. The material itself may have a releasing property, but it may have a releasing property by performing a releasing treatment.
The release treatment is usually performed by applying a release agent such as a silicone-based release agent or a Teflon-based release agent by a method such as spraying, dipping, or baking.

The thickness of the packaging material is not particularly limited. (Thermoplastic Film) In the present invention, the thermoplastic film is a protective material for preventing a worker's hand from directly touching the solidified hot melt adhesive.

Next, the thermoplastic film has no tackiness or low tackiness at a level that does not cause a problem in workability, and has high compatibility with the hot melt pressure-sensitive adhesive. A film that can be mixed with the melt adhesive,
Either a single-layer film or a multilayer film may be used. For this reason, the solidified hot melt can be uniformly remelted, and there is no influence on the heating stability, adhesiveness, and tackiness.

The resin constituting the thermoplastic film includes, for example, ethylene-based polymers such as ethylene / vinyl acetate, and ethylene-unsaturated such as ethylene-acrylate, ethylene-methacrylate, ethylene-methyl acrylate, ethylene-methyl methacrylate. Carboxylic acid copolymers, high or low density polyethylene, polyethylene mixtures, and chemically modified polyethylene, ethylene and mono- or di-unsaturated monomers having 1-6 carbons, polyamides; polybutadiene rubbers, Polyesters such as polyethylene terephthalate and polybutylene terephthalate; thermoplastic polycarbonates, atactic poly-α-olefins, atactic polypropylene, polyisobutylene, styrene-butadiene-styrene block copolymers and the like. Styrene - isoprene - styrene block copolymer, styrenic block copolymers such as hydrogenated product thereof (SBC); polyurethanes; polymethylpentene and the like. In addition, hot melts using them as base polymers can also be mentioned.

The thermoplastic film is formed of a polyethylene-unsaturated carboxylic acid copolymer such as EVA or EEA, a styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene block copolymer, or a hydrogenated product thereof. Styrene block copolymer (SBC)
It is preferable that the film contains at least one resin selected from the group consisting of:

The thermoplastic film may contain, if necessary, an antioxidant, an antiblocking agent, a processing aid, an antistatic agent, a stabilizer, an ultraviolet absorber, a light stabilizer, in order to improve the stability of the film. Other optional components such as a plasticizer, a tackifying resin, a reinforcing resin, a colorant, a fragrance, a filler, and the like can be included.

The thickness of the thermoplastic film is preferably 5
To 100 μm, more preferably 10 to 60 μm
It is. If the thickness of the thermoplastic film is less than 5 μm, it is not possible to reduce the tackiness of the surface of the hot melt pressure-sensitive adhesive, resulting in reduced workability during use. On the other hand, when the thickness of the thermoplastic film is more than 100 μm, the ratio of the thermoplastic film to the hot melt adhesive increases, and when used, it becomes difficult to be compatible in the tank, and the heating stability, adhesiveness, and tackiness are reduced. descend.

The melting point or softening point of the thermoplastic film is not particularly limited, but the melting point of the hot-melt pressure-sensitive adhesive should be lower than the melting temperature of the hot-melt pressure-sensitive adhesive. Can be dissolved in
preferable. (Packaging Method of Hot Melt Adhesive) Hereinafter, the packaging method of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an example of the packaging method of the present invention in chronological order. As the packaging material 1, a release film having an inner surface having a release property is used. The sheet-like packaging material 1 is pushed into the depression 51 of the molding die 5 to form the depression 11 of the packaging material 1. As shown in the figure, a thermoplastic film 2 is overlaid on the inner surface of the sheet-like packaging material 1.

Next, the melt 3a of the hot melt adhesive is filled in the recess 11 of the packaging material 1 (FIG. 1 (b)).

Since the mold 5 receives the melt 3a of the hot-melt pressure-sensitive adhesive as described above, it must have high heat resistance so that the shape does not change due to softening or the like due to the heat. Yes, if the heat resistance is high, the material is not particularly limited. For example, acrylonitrile / butadiene /
Hard plastics such as styrene polymers and polypropylene, and metallic materials can be used.

Thereafter, the melt 3 a of the hot melt adhesive filled in the recess 11 of the packaging material 1 is cooled and solidified in the mold 5. At this time, the mold 5 may be forcibly cooled, but it is desirable to solidify the mold by natural cooling in order to reduce energy costs.

The melting temperature (filling temperature) of the hot melt pressure-sensitive adhesive is preferably higher than the melting point of the thermoplastic film 2. Thereby, the surface layer surface of the thermoplastic film 2 is partially melted, and the compatibility with the hot melt adhesive is increased.

The solidified product 3b of the hot-melt pressure-sensitive adhesive is extracted together with the sheet-like packaging material 1 from the molding die 5, and then the edges of the sheet-like packaging material 1 are brought together to form the adhesive of the hot-melt pressure-sensitive adhesive at the time of work. It is covered with the wrapping material 1 to the extent that there is no problem due to the nature (FIG. 1 (c)).

Thus, the package A of the hot melt adhesive can be obtained.

FIG. 2 shows an example in which two recesses of the packaging material are formed. That is, a molding die 5 'having two locations (dents) 11 for filling the melt 3a' of the hot melt adhesive is used (FIG. 2 (a)). A thermoplastic film 2 is overlaid on the inner surface of the packaging material 1. The melts 3a 'of the hot melt adhesive are filled into the two depressions 11, 11 from the nozzle 4 (FIG. 2 (b)), and these melts 3a', 3
a ′ is cooled and solidified (FIG. 2C). Then, the top surfaces of the two obtained solidified hot melt adhesives 3b ', 3b' are aligned, and the ends of the packaging material 1 are brought together to obtain a package A '((d in FIG. 2). )).

According to such a two-packing method, a hot melt pressure-sensitive adhesive package can be obtained more easily and workability is further improved.

In the above example, a release film is used as a packaging material, but the same can be applied to a case where a thick release sheet is used.

When a container having releasability is used as a packaging material, if the container is filled with a hot melt adhesive and has a high heat resistance which does not change its shape due to softening or the like, it is not always necessary. It is not necessary to use the molds 5, 5 '.

The package of the hot-melt pressure-sensitive adhesive thus obtained is packaged by blocking even if pressure and temperature increase because the hot-melt solidified product is packaged in a durable packaging material. Objects can be stored, used, etc. without sticking to each other, sticking to other things, or getting dirty. (How to use the hot melt pressure sensitive adhesive package) The method of using the hot melt pressure sensitive adhesive package is not particularly limited, but usually, the packaging material is peeled off, and the thermoplastic film is melted while being adhered to the solidified hot melt. It is put into a pot and heated and melted for use.

At this time, since the thermoplastic film for reducing the tackiness of the hot melt pressure-sensitive adhesive to a level having no problem in use is superimposed on the release packaging material, the solidified hot-melt pressure-sensitive adhesive can be easily taken out. Since the adhesiveness at the time of use is at a level that does not interfere, the workability at the time of use is enhanced.

Since there is no air layer between the thermoplastic film and the solidified hot-melt adhesive, the solidified hot-melt adhesive is uniformly melted, and air is not entrapped. It does not cause coating abnormalities.

Even without stirring, the thermoplastic film can be uniformly melt-mixed with the solidified hot-melt pressure-sensitive adhesive, and there is no decrease in heat stability, adhesiveness and tackiness.

[0048]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. (Example 1) PET film (25 μm
Thickness) is used as a packaging material, and a thermoplastic film (EVA, thickness:
(50 μm). This thermoplastic film can be uniformly melt-mixed with the hot melt adhesive.

The double structure sheet was spread over the mold shown in FIG. 1 so that the thermoplastic film became the filling surface (upper surface).

A hot-melt pressure-sensitive adhesive manufactured by melt-mixing with a melter (Nittite HT- manufactured by Nitta Gelatin Co., Ltd.)
470) at a melting temperature of 150 ° C. from a filling machine into a molding die.

After cooling and solidifying, the edges of the PET film are brought together to cover the upper surface of the solidified hot melt,
It was taken out of the mold to obtain a hot melt adhesive package.

The package was packed in a cardboard case with the release film (PET film) attached.

The following tests were performed on the obtained packages. Table 1 shows the results. (Test method) 1) Melt viscosity The melt viscosity was measured according to the melt viscosity test method for hot melt adhesives described in JIS K6862-1984.

2) Softening point The softening point was measured according to the method for testing the softening point of a hot melt adhesive described in JIS K6863-1994.

3) Storage Property The packages were stored in a constant temperature bath at 40 ° C. for one month, taken out of the cardboard case, and examined for blocking of each package. The evaluation criteria are as follows. Evaluation criteria: ：: easily peeled.

Δ: The package was blocked and hardly peeled off.

C: No peeling.

4) Release Film Release Property The package of the hot melt adhesive is stored in a constant temperature bath at 40 ° C. for one month, taken out of the cardboard case, and easily peeled when the release film is peeled off from the hot melt adhesive. Was tested. The evaluation criteria are as follows. Evaluation criteria: ：: easily peeled.

Δ: The release film was difficult to peel.

×: Did not easily peel off.

5) Compatibility The package was put into a melting tank of a hot-melt pressure-sensitive adhesive applicator and melted at a melting temperature of 130 ° C., and the hot-melt pressure-sensitive adhesive melt was discharged from a nozzle. At this time, it was examined whether there was a clogged filter, a clogged nozzle, or an abnormal discharge. The evaluation criteria are as follows. Evaluation criteria: ：: No abnormality.

X: Abnormality was observed.

6) Adhesive Strength A hot melt adhesive was applied to a PET film, and the thickness was 50 μm.
m, and the adhesive strength at 23 ° C. was measured with PICMA-TACK TESTER (manufactured by Toyo Seiki).

7) Peel strength A hot-melt pressure-sensitive adhesive was applied to the PET film, and the thickness was 50 μm.
m, and stuck it on a stainless steel plate.
After standing at 3 ° C. overnight, 180 ° at 23 ° C. in a tensile tester.
The peel strength is measured. The crosshead speed at the time of measurement was set to 300 mm / min.

8) Adhesion to Hand During Work Under a test environment of 35 ° C., the hot melt solidified product wrapped with the thermoplastic film was taken out of the PET film, and the degree of adhesion to the hand after grasping by hand was evaluated. did. The evaluation criteria are as follows. Evaluation criteria: A: Does not adhere to hands.

B: Slightly adheres to hands.

C: Slightly adheres to hands, but does not hinder work.

D: Difficult to adhere to hands, slightly hindering work.

E: It adheres to the hand and cannot be easily peeled off. (Example 2) The type of hot melt adhesive to be packaged was changed to Nittaite HT-454 manufactured by Nitta Gelatin Co., Ltd., and the mold was changed to that shown in FIG.
It was the same as in Example 1. The same test as in Example 1 was performed on the obtained package. Table 1 shows the results. (Example 3) The procedure was the same as in Example 1 except that the type of hot melt adhesive to be packaged was changed to Nittite HT-480 manufactured by Nitta Gelatin Co., Ltd. The same test as in Example 1 was performed on the obtained package. Table 1 shows the results. (Example 4) The thickness of the thermoplastic film was reduced by half (25 μm).
m) was the same as in Example 1. The same test as in Example 1 was performed on the obtained package. Table 1 shows the results. (Example 5) 25 parts by weight (hereinafter, abbreviated as "parts") of SBS (Taphrene A manufactured by Asahi Kasei Kogyo Co., Ltd.), 35 parts of liquid paraffin (Kidor Co., Ltd.), styrene resin (Hercules Krystalex Co., Ltd.) 1120) 1
0 parts, hydrogenated petroleum resin (Arakawa Chemical Industries, Ltd., Alcon M-13)
5) Melt and mix 20 parts and 10 parts of wax (Polywax 2000, manufactured by Toyo Petrolite Co., Ltd.)
A thermoplastic film (50 μm thick) that can be uniformly melt-mixed with the hot melt adhesive was produced.

The procedure was the same as in Example 1 except that the above-mentioned thermoplastic film was used and the mold was changed to that shown in FIG. The same test as in Example 1 was performed on the obtained package. Table 1 shows the results. (Example 6) In addition to changing the type of hot melt adhesive to be packaged to Nittaite HT-480 manufactured by Nitta Gelatin Co., the thickness of the thermoplastic film was set to 100 µm, and the mold was changed to that shown in Fig. 2. Was the same as in Example 1. The same test as in Example 1 was performed on the obtained package. Table 1 shows the results. (Example 7) A paper-forming mold of the type shown in FIG. 1 having an inner surface released was prepared, and a thermoplastic film (EVA, thickness: (50 μm). Hot melt adhesive manufactured by melt-mixing with a melter (Nitta Gelatin Co., Ltd.)
Nitite HT-470) was charged into a mold at a melting temperature of 150 ° C. from a filling machine. After cooling and solidification, the top surface of the hot melt solidified product was covered with a portion of the packaging material not yet covered with the hot melt solidified product, to obtain a package of the hot melt adhesive. The package was packed in a cardboard case with the paper mold.

The obtained package was subjected to the same test as in Example 1. Table 1 shows the results. Example 8 A thermoplastic film was superimposed on a PET film by lamination. Otherwise, the procedure was the same as in Example 1. The same test as in Example 1 was performed on the obtained package. Table 1 shows the results. (Comparative Example 1) The same operation as in Example 1 was performed except that the superposition of the thermoplastic films was omitted. The same test as in Example 1 was performed on the obtained package. Table 2 shows the results. (Comparative Example 2) In Example 1, the type of hot melt adhesive to be packaged was changed to Nittaite HT- manufactured by Nitta Gelatin Co., Ltd.
480. The same PET film and thermoplastic film as in Example 1 were used, but the PET film was directly filled with the melt of the hot melt adhesive without superimposing the thermoplastic films, and the melt was cooled and solidified. The solidified product was peeled off from the PET film, repackaged with a thermoplastic film, and then packed in a cardboard case. Otherwise, the procedure was the same as in Example 1. The same test as in Example 1 was performed on the obtained package. Table 2 shows the results. Comparative Example 3 The thickness of the thermoplastic film was changed from 50 μm in Comparative Example 2 to 200 μm. Otherwise, the procedure was the same as in Comparative Example 2. About the obtained package,
The same test as in Example 1 was performed. Table 2 shows the results.

[0072]

[Table 1]

[0073]

[Table 2]

[0074]

According to the hot melt pressure-sensitive adhesive package and the packaging method of the present invention, the solidified hot-melt pressure-sensitive adhesive can be easily removed from the packaging material without danger.
Therefore, the workability during use is high, and the package of the hot melt adhesive does not block during storage, and
When remelted, it is uniformly melted, and there is no effect on the heating stability and adhesiveness / tackiness during use. And the packaging method of the hot melt adhesive concerning the present invention can manufacture the above-mentioned package with good productivity.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a packaging method according to the present invention in chronological order.

FIG. 2 is a diagram illustrating another example of the packaging method according to the present invention in time series.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet-shaped packaging material 2 Thermoplastic film 3a Hot melt adhesive melt 3b 'Solidified hot melt adhesive 4 Hot melt adhesive package 4' Hot melt adhesive package 5 Mold 5 'Mold

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E067 AA04 AA11 AB96 BA18A BB14A BB25A CA30 EA01 EA29 EB23 EE48 EE59 FA04 FC01 GD08 3E068 AA24 AB08 AC09 BB20 CC26 CD01 CE01 CE03 DD27 DD40 DE10 EE31

Claims (7)

[Claims] 1. A thermoplastic material obtained by solidifying a hot-melt pressure-sensitive adhesive obtained by filling and solidifying a packaging material into a packaging material, wherein at least a part of the entire surface is melted at the melting temperature of the hot-melt pressure-sensitive adhesive. A package of a hot-melt pressure-sensitive adhesive, which is covered with a film, is made of a material that does not melt at its melting temperature, and whose inner surface is packaged with a packaging material having releasability. 2. A method for wrapping a hot-melt adhesive in a packaging material, wherein the packaging material is made of a material that does not melt at the melting temperature of the hot-melt adhesive and has an inner surface that has releasability. Along with superimposing a thermoplastic film that melts at the melting temperature of the hot melt adhesive on the inner surface of the packaging material, filling a melt of the hot melt adhesive in a recess of the packaging material, A method for packaging a hot melt adhesive, comprising cooling and solidifying a molten material in the depression, and wrapping the solidified material of the hot melt adhesive with the packaging sheet. 3. The hot wrap according to claim 2, wherein the packaging material has two depressions, and the packaging material is wrapped so that the upper surfaces of two solidified products obtained in these depressions are aligned. Melt adhesive packaging method. 4. The method for packaging a hot melt pressure-sensitive adhesive according to claim 2, wherein the thermoplastic film is a multilayer film. 5. The method for packaging a hot melt adhesive according to claim 2, wherein said thermoplastic film is laminated on an inner surface of said packaging material. 6. The thermoplastic film comprises at least one resin selected from the group consisting of polyolefin, ethylene-unsaturated carboxylic acid copolymer, styrene block copolymer (SBC), polyamide, polyacryl, polyurethane and polyester. The hot melt pressure-sensitive adhesive packaging method according to any one of claims 2 to 5, which is a film as a material. 7. The method for packaging a hot melt adhesive according to claim 2, wherein the melting point of the thermoplastic film is lower than the melting temperature of the hot melt adhesive.