JPH03258496A - Pressurization treatment - Google Patents

Abstract

PURPOSE:To prevent penetration of a pressurizing medium into a package so that a safe and sure pressurization treatment can be executed by forming a crosslinkable resin layer on the outermost layer of the package and a sealing layer consisting of a crosslinkable resin on the end face of the package. CONSTITUTION:The work which is packed and hermetically sealed into the package 1 constituted of laminated films 2 having the crosslinkable resin layer 5 on at least the outermost layer is subjected to the pressurization treatment under >=500kgf/cm<2> via the package 1 having flexibility in the pressurizing medium. The penetration of the pressurizing medium into the package 1 is prevented by the crosslinkable resin even if the pressurizing medium is an oil medium at this time. Since the sealing layer 6 consisting of the crosslinkable resin 5 is formed on the end face of the package 1 as well, the penetration of the pressurizing medium into the package 1 is further effectively prevented and the safe and sure pressurization treatment is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pressure treatment method, and particularly to a pressure treatment method in which a package is hermetically filled with a pressure treatment object.

[Conventional technology]

Conventionally, various pressure treatments have been performed in metallurgy, such as in the molding of metal powders, in the formation of ceramics, emulsions, and polymer alloys.

As a pressurizing method, a common method is to place the object to be pressurized in a predetermined pressurizing member and apply pressure using a hydraulic press or a mechanical press.

However, in recent years, a method has been developed in which a pressurized object is placed in a liquid pressurizing medium and high pressure is applied via the pressurizing medium.

[Problem to be solved by the invention]

However, depending on the object to be pressurized, it is not preferable to put it directly into the pressurizing medium, and there is a problem that the pressurizing process cannot be performed unless it is packed in a flexible package. Furthermore, when considering the maintenance, durability, etc. of the pressurizing device, an oil-based medium is preferable to an aqueous medium as a pressurizing medium. There was also the problem that it got mixed into the material to be pressurized.

The present invention was devised in view of the above-mentioned circumstances, and it is possible to safely perform pressure treatment even when an oil-based medium is used while the packaged object is hermetically filled with the material to be pressurized. The purpose of the present invention is to provide a pressure treatment method.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has provided that a package hermetically filled with a pressurized material is 5-50% packed in a pressurizing device via a pressurizing medium.
In a pressure treatment method in which a material to be pressure treated is treated by applying pressure at a pressure of 00 kgl/af or more, the package is a flexible laminated film having a crosslinkable resin layer formed on at least the outermost layer. At the same time, a large stopper layer made of a crosslinkable resin is formed on the end face of the package.

[Effect]

The pressurized material is filled and sealed in a package made of a laminated film having at least a crosslinkable resin layer on the outermost layer.
500 k through flexible packaging in pressurized medium
It is pressurized at a pressure of gl/cI1 or more, and at this time, even if the pressurizing medium is an oil-based medium, the above-mentioned crosslinkable resin layer prevents the pressurizing medium from penetrating into the package, and the end surface of the package Since a sealing layer made of a cross-linked resin is also formed on the package, penetration of the pressurizing medium into the package is more effectively prevented, and safe and reliable pressurization can be performed.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a package used in the present invention. In FIG. 1, a package 1 is made by heat-sealing a pair of flexible laminated films 2 facing each other and surrounding the film. FIG. 2 is a partial sectional view of the heat-sealed portion 3 of the package 1 shown in FIG. In FIG. 2, the laminated film 2 consists of a base material 4 and a crosslinkable resin layer 5, and one set of the laminated films 2 has the base materials 4 facing each other to form a heat-sealed portion 3 at the peripheral edge. A sealing layer 6 is formed on the end face of the package 1, that is, on the end face of the heat-sealed portion 3 of the package 1.

As the base material 4, a single layer base material or a laminated base material of a plastic film, a laminated base material of a plastic film and a metal foil, etc. can be used. For example, a heat-resistant film such as polyethylene terephthalate (PET) or polyimide may be used as the single-layer base material of the plastic film.

The cross-linkable resin layer 5 is for preventing the oil-based medium from penetrating into the inside of the package 1 when an oil-based medium is used as the pressurizing medium, and is for improving adhesion to the base material 4 and cross-linking. It can be selected as appropriate based on workability such as reaction time, oil resistance, etc. As the crosslinkable resin layer 5, for example, a crosslinking reaction product of polyvinyl butyral resin and polyisocyanate can be used. In this case, the molar equivalent ratio of polyvinyl butyral resin and polyisocyanate is 1:1 to 1.
．． About 3 is preferable. After applying a mixed dispersion of polyvinyl butyral resin and polyisocyanate to the surface of the base material 4, a crosslinking reaction is caused under predetermined conditions to form the crosslinkable resin layer 5. The thickness of such a crosslinkable resin layer 5 is usually about 0.1 to 3 μm.

The sealing layer 6 is made of a cross-linked resin, and, like the cross-linked resin layer 5, is used to prevent oil-based media from penetrating into the inside of the package 1 from the end surface of the heat-sealed portion 3 of the package 1. . The crosslinkable resin used as this sealing layer 6 is
It may be the same as the crosslinkable resin layer 5 described above. Then, the sealing layer 6 is formed on the end surface of the heat-sealed portion 3 of the package 1 after the pressurized material is sealed and filled. The thickness of such a sealing layer 6 is usually about 0.1 to 3 μm.

Pressurized materials to which the present invention can be applied include various metal powders, carbon, metal oxides, silicate compounds (silica,
(feldspar, clay), polyolefin resins, polyurethane resins, polyamide resins, polyimide resins, fluorinated resins, etc. In addition to powder, the shape may be a composite of single fibers.

In the present invention, various known high-pressure devices such as a device using a reciprocating pump can be used. Also,
The pressurizing medium can be selected depending on the type of contents, the method of using the package, etc., and in the present invention, it can be appropriately selected from not only water but also various oil-based media such as silicone oil.

In addition, the pressurization conditions in the present invention are 500 kg 110f
Above, preferably 1000 to 10000 kgl/L:
It is d. In the present invention, heat treatment may be used in combination with the pressure treatment, and in this case, the temperature of the pressure medium is 40 ° C.
The temperature is preferably about 200°C.

Further, the pressurization time is preferably about 3 seconds to 60 minutes, and the pressure may be applied continuously or intermittently within this time. When pressurizing intermittently, the time for one pressurization is preferably about 3 seconds to 30 minutes, the time for one depressurization is preferably about 2 seconds to 10 minutes, and the pressure at the time of decompression is 500 kg
It is preferable to set it to below 1/cffl. By applying pressure intermittently in this manner, even higher pressure treatment effects can be obtained.

Experimental Example First, polyisocyanate was added to a toluene solution containing 5% polyvinyl butyral resin so that the molar equivalent ratio to the polyvinyl butyral resin was 2, and a dispersion treatment was performed to prepare a mixed dispersion. Spread this mixed dispersion to a thickness of 2
It was coated on one side of a 5 μm PET film and dried to form a laminated film. The amount of mixed dispersion applied is 1 based on the solid content.
．． After the dispersion was adjusted to 0 g/d, it was left at 50° C. for one week to complete the crosslinking reaction of the mixed dispersion to form a crosslinkable resin layer (thickness: 1 μm). Next, one set of the above laminated films is heat-sealed on three sides with the PET film surfaces facing each other to form the package shown in Figure 1 (however, it is not completely sealed yet). ).

After filling this package with ultra-high molecular weight polyethylene (molecular weight 1 million to 5 million) as a pressurized material, the unsealed part was heat-sealed to completely seal it, and the above mixed dispersion was applied to the heat-sealed end surface. (Amount applied is 1.0 in terms of solid content)
g/i). After coating, the package was left at 50° C. for one week to complete the crosslinking reaction of the mixed dispersion and form a sealing layer (thickness: 1 μm).

Such a package was placed in silicone oil at 120°C for 50 minutes.
00kgl/a+! , a pressure treatment was performed for 10 minutes.

In addition, as a comparative example, a package in which the above-mentioned sealing layer was not formed, a package in which the above-mentioned crosslinkable resin layer and the above-mentioned sealing layer were not formed were created and the same pressure treatment was performed. .

After the pressure treatment, the condition of the package was observed, and it was found that the silicone oil did not penetrate into the package, and the package did not break. On the other hand, in the pressure treatment using two types of packages in Comparative Examples, penetration of silicone oil into the interior of the packages was observed in both cases.

〔Effect of the invention〕

As detailed above, according to the present invention, even if the pressurizing medium is an oil-based medium, the crosslinkable resin layer formed on the outermost layer of the package and the crosslinkable resin formed on the end surface of the package The sealing layer prevents the pressurized medium from permeating into the package, and has the effect of enabling safe and reliable pressurization treatment.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a package used in the present invention, and FIG. 2 is a partial sectional view of a heat-sealed portion of the package shown in FIG. DESCRIPTION OF SYMBOLS 1... Packaging body, 2... Laminated film, 3... Heat seal part, 4... Base material, 5... Crosslinkable resin layer, 6... Sealing layer.

Claims (1)

[Scope of Claims] 1. The pressurized material is compressed by pressurizing the packaged material hermetically filled with the material to be pressurized in a pressurizing device at a pressure of 500 kgf/cm^2 or more via a pressurizing medium. In the pressure treatment method, the package is composed of a flexible laminated film having a crosslinkable resin layer formed on at least the outermost layer, and a sealing layer made of a crosslinkable resin is provided on the end surface of the package. A pressure treatment method characterized in that: is formed. 2. The pressurized treatment method according to claim 1, wherein the pressurized medium is an oil-based medium.