JP3391661B2 - Laminates and bags - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat-resistant laminate and a bag using the same.

[0002]

2. Description of the Related Art Conventionally, metal foils are often used as sheets or in containers, bags, etc., but few have relatively high heat resistance. The reason is that in the case of metal foil, the specific surface area per unit weight is large compared to general bulk materials, and it is easy to oxidize,
This is because it has the property of burning. In addition, since its thermal conductivity is large, it has poor heat insulation performance, and when a part of it contacts a substance with a high temperature, the entire temperature rises rapidly and heat is transmitted to the surrounding substances, which is also a safety aspect. There are many problems.

For example, in a pharmaceutical manufacturing site, when manufacturing a glass ampoule container containing a liquid medicine, 1300 to 15
Massive chips at around 00 ° C are generated. This chip is obtained by fusing and removing an unnecessary portion after the medicine-filled seal, but conventionally, the on-site treatment was put in a metal can such as a drum can or a metal container. These take up space and are bulky and have problems such as being inconvenient to carry, and the temperature of the can or container itself rises,
There were problems such as the risk of fire and burns. Moreover, when the thickness of the metal plate used for the can or container is thin, or when the metal foil is formed into a bag shape, there is a problem that inconvenience such as perforation due to melting occurs.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a laminate which is flexible, has excellent heat resistance, is not bulky, and is free from fear of perforation or fire, and a bag formed by the laminate.

[0005]

[Means for Solving the Problems] To solve the above problems,
In the invention, the outer surface metal foil having a thickness of 4 μm or more in order,
A laminate was constituted by an intermediate resin layer having a thickness of 5 to 40 μm, an inner metal foil having a thickness of 9 μm or more, and a self-extinguishing resin layer having a thickness of ² to 10 g / m ² .

Further, a bag such as a flat bag, a square bag, or a self-supporting bag is formed from the laminated body.

[0007]

The laminated material of the present invention is instantly 1300 to 15
It can withstand the contact of hot materials at 00 ° C. As its action, first, the self-extinguishing resin layer on the heating side, i.e., the inner surface, does not burn and lowers the temperature of the high-temperature substance, has a heat insulating effect, and alleviates the thermal influence on the adjacent metal foil as much as possible, thereby melting. Prevents perforation due to etc. Adjacent metal foils diffuse heat and contribute to the strength of the laminate. Due to this heat diffusion, the metal foil further reduces the thermal influence on the next intermediate resin layer, and prevents the intermediate resin layer from melting. The intermediate resin layer contributes to the strength of the laminate and has a heat insulating effect to prevent heat conduction to the outer metal foil on the side opposite to the heating side as much as possible. Due to this effect, the temperature on the side opposite to the heating side decreases,
Prevent the risk of burns and fire spread. The outer metal foil on the side opposite to the heating side plays the role of dissipating heat into the atmosphere and has the effect of softening the heat storage of the laminate. With the above configuration,
It is possible to obtain a laminate suitable as a packaging base material for heat-resistant packaging that accommodates a disposable high-temperature flexible inorganic material and a metal material.

If the outer metal foil on the side opposite to the heating side is omitted, the heat radiation is insufficient and the heat resistance is poor. This metal foil has sufficient heat resistance if it has a thickness of at least 4 μm or more. In addition, the presence of the intermediate resin layer makes it possible to secure heat insulation, and without this resin layer, it cannot be expected to secure heat resistance. Furthermore, the inner metal foil on the heating side is 9μ
It is possible to secure heat resistance by designing it to m or more.
If it is less than μm, the heat capacity is small and there is a problem in heat resistance.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the heat resistant laminate 10 is
The metal foils 12 and 13 are laminated on both surfaces of the intermediate resin layer 11, and the self-extinguishing resin layer 14 is provided on the outer surface of the metal foil 13 on the inner surface. During bag making, the self-extinguishing resin layer 14 becomes the inner surface.

The self-extinguishing (non-combustible) resin is classified into a thermosetting type and a thermoplastic type, and as the thermosetting type resin, a brominated epoxy resin (for example, DER542 manufactured by Dow Chemical Co.) is mentioned. To be On the other hand, as the thermoplastic resin, vinyl chloride / vinyl acetate / maleic acid terpolymer resin (for example, Kancoat SJ1299 manufactured by Kansai Paint Co., Ltd.), chlorinated polypropylene resin (for example,
Mitsui Petrochemical Industry Co., Ltd., Unistol 200), polyvinylidene chloride (for example, Asahi Kasei Co., Ltd., Saran Latex L502) and the like can be mentioned. Among these,
Vinyl chloride / vinyl acetate / maleic acid terpolymer resin is preferred. If a thermoplastic resin is used,
Bags can be easily made by heat sealing.

The coating amount of the self-extinguishing resin is ² to 10 g / m ^{2 and} preferably 3 to 7 g / m ² in the dry state of the resin. If it is less than 2 g / m ² , the heat insulating effect is insufficient and there is a risk that holes may be formed in the adjacent metal foils 13. Even if it exceeds 10 g / m ² , the performance is not so much improved, and only the cost is increased. The layer 14 can also be formed by laminating films.

The metal foil 13 on the heating surface side, that is, adjacent to the self-extinguishing resin layer 14, must have a thickness of 9 μm or more.
It is preferably 15 to 50 μm. If the thickness is less than 9 μm, the strength is low, the thermal diffusivity is low, and the temperature locally rises, which causes melting and causes perforation. The upper limit is not particularly limited, but if it exceeds 50 μm, it causes an increase in cost and a decrease in flexibility. As the metal foil, aluminum foil, copper foil, steel foil, titanium foil, tin foil, stainless steel foil and the like can be used, but aluminum foil is preferable in terms of cost.

The intermediate resin layer 11 located between the metal foils 12 and 13 is preferably a film having a thickness of 5 to 40 μm. The thickness is more preferably 10 to 25 μm. If it is less than 5 μm, the heat insulating performance and the strength of the laminated material are insufficient, which causes the perforation and lowers the heat insulating performance. If the insulation performance is insufficient,
A large amount of heat is transferred to the metal foil on the opposite side to the heating side, causing burns. The upper limit is not particularly limited, but if it exceeds 40 μm, it causes cost increase and inferior flexibility. Examples of the resin film include a polyester film (for example, Toyobo Co., Ltd., ester film E5100), an unstretched polypropylene film (for example, Toyobo Co., Ltd., Pyrene film CT: P1120), a nylon film (for example, Toray Synthetic Film Co., Ltd., Rayfan 1401) or the like can be used.

The outer metal foil 12 on the side opposite to the heating side is necessary for heat dissipation and is not particularly limited in thickness as long as it has a thickness of 4 μm or more, but it is practically 4 to 4 in terms of cost.
It is 20 μm. The material is not particularly limited, and aluminum foil, copper foil, steel foil, titanium foil, tin foil, stainless steel foil and the like can be used, but aluminum foil is preferable in terms of cost. If it is less than 4 μm, there are disadvantages such as an increase in pinholes in the metal foil and a low strength in handling. further,
This outer metal foil 12 may be provided with an overcoat layer of about 1 μm. The main purpose of this overcoat layer is to protect the metal foil, and it has an effect of preventing stains and scratches. The resin used for the overcoat layer includes acrylic resin, epoxy resin, nitrocellulose resin and the like.

The method of laminating the metal foils 12 and 13 and the resin layers 11 and 14 can be selected in various ways. For example, a method such as adhesion with an adhesive, extrusion coating or coating can be adopted. When using an adhesive, it is preferable to use a two-component curing type urethane-based dry laminating adhesive.

An example of a bag formed by using the laminate 10 is shown in FIGS. FIG. 2 shows a flat bag 20,
An elongated sheet made of the laminated body 10 is folded in two, the fold line is the bottom 21, and the heat-sealed portions 22, 22 having a predetermined width are formed in the overlapping portions of both side edges. Alternatively, as shown in FIG. 3, two short sheets of the laminated body 10 are used.
Sealing parts 21a, 22, 2 on the bottom and both side edges
2 may be formed. The former is a so-called two-sided seal and the latter is a three-sided flat bag.

As shown in FIG. 4, a square bag 20a having end walls 23, 23, side walls 24, 24 and a bottom wall 25 may be used. Alternatively, the self-standing bag 20b as shown in FIG. 5 can be used. These bags can be formed without using a heat seal adhesive by selecting a thermoplastic resin for the self-extinguishing resin layer 14 on the inner surface of the laminate 10.

Examples and comparative examples will be given below.

[0020]

[Examples 1 to 5] An aluminum foil having a thickness shown in the table of Fig. 6 was used as an inner surface, that is, a heating-side metal foil, and a vinyl chloride-vinyl acetate-maleic acid terpolymer resin ( Resin A. Kansai Paint Co., Ltd., SJ1299) was applied at 6 g / m ² and after drying, 4 g of a two-component curing type urethane resin was applied to the other surface of this aluminum foil.
After applying m ² (dry) and drying, dry lamination of a polyester film having the thickness shown in the table of FIG.
Further, the same amount of urethane resin as described above was applied to the outer surface of this polyester film, and the aluminum foil shown in FIG. 6 was laminated to form a heat resistant laminate, which was then placed in a furnace at 60 ° C.
It was left for 8 hours for aging.

[0021]

[Example 6] Examples 1 to 6 except that a chlorinated polypropylene resin (resin B, Unistall 200 manufactured by Mitsui Petrochemical Industry Co., Ltd.) was applied as a self-extinguishing resin at 6 g / m ² .
A heat resistant laminate was formed in the same manner as in No. 5.

[0022]

Examples 7 to 8 Heat-resistant laminates were obtained in the same manner as in Examples 1 to 5 except that copper foil and iron foil having the thickness shown in FIG. 6 were used for the metal foils on the inner and outer surfaces, respectively.

[0023]

Comparative Example 1 As shown in FIG. 7, a laminate was prepared in which a self-extinguishing A resin was applied only to an aluminum foil having a thickness of 40 μm.

[0024]

[Comparative Example 2] The same laminate as in Example 1 was prepared except that the metal foil on the outer surface was omitted.

[0025]

[Comparative Examples 3, 4, 5] Instead of the self-extinguishing resin, the resins shown in FIG. 7 were used. The thickness is 25 μm,
It was 20 μm and 20 μm. Others were the same as in Example 1.

[0026]

Comparative Example 6 A laminate was prepared in which a thin (4 μm) aluminum foil was used on the inner surface, that is, the heating side, and the intermediate resin layer was slightly thickened.

Using the laminates of the above-mentioned Examples and Comparative Examples, the self-extinguishing resin layer or the inner surface resin layer was placed on the inner side.
A 0 mm × 720 mm flat bag (three-sided seal) was formed.
This flat bag has a diameter of 5 which is discharged from the ampoule filling and sealing machine.
The molten glass chips having a size of 10 mm and a height of 10 mm were continuously stored. The results are shown in FIGS. 6 and 7. In the column of evaluation, ○ indicates that the self-extinguishing resin in the portion in contact with the glass chip was discolored, but there was no damage such as perforation of the bag at all, and there was no problem in use, Δ indicates that the inner surface resin layer spreads, and The adjacent aluminum foils were melted, and x indicates that the laminate was perforated and unsuitable for use.

In addition to the bag, the laminated body of the present invention includes a container, an inside of a heat insulating plate, a portable ashtray, a sheet for soldering work, a metal ceramic, glass, etc. Its uses are diverse.

[0029]

According to the present invention, as described above, the self-extinguishing resin layer is provided on the inner surface of the heat-resistant material with the synthetic resin layer sandwiched between the metal foils in the middle. Adjacent metal foil diffuses its heat to mitigate the heat effect on the intermediate synthetic resin layer, and the metal foil on the outer surface radiates heat effectively to prevent fire or burns due to hand contact. So the temperature can be lowered.

The intermediate resin layer, together with the metal foil, holds the laminate at a sufficient strength to obtain a flexible bag having excellent heat resistance.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a laminated body of the present invention.

FIG. 2 is a perspective view showing an example of a flat bag formed by the above laminated body.

FIG. 3 is a perspective view showing another example of the flat bag.

FIG. 4 is a perspective view showing an example of a square bag.

FIG. 5 is a perspective view showing an example of a self-standing bag.

FIG. 6 is a chart showing evaluation results of examples.

FIG. 7 is a chart showing the evaluation results of comparative examples.

[Explanation of symbols]

10 stacks 11 Intermediate resin layer 12, 13 Metal foil 14 Self-extinguishing resin layer 20 flat bags 20a square bag 20b freestanding bag 21 bottom 21a, 22 Seal part 23 Edge wall 24 Side wall 25 bottom wall

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-56438 (JP, A) JP-A-3-69623 (JP, A) JP-A-4-87949 (JP, A) JP-A-3- 223597 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B32B 15/08 B65D 30/02

Claims (2)

(57) [Claims] 1. A laminate comprising an outer metal foil having a thickness of 4 μm or more, an intermediate resin layer having a thickness of 5 to 40 μm, an inner metal foil having a thickness of 9 μm or more, and a self-extinguishing resin layer of ² to 10 g / m ² in order. . ^2. A laminate comprising an outer metal foil having a thickness of 4 μm or more, an intermediate resin layer having a thickness of 5 to 40 μm, an inner metal foil having a thickness of 9 μm or more, and a self-extinguishing resin layer of ² to 10 g / m ² in order. Bag formed by.