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Barrier-film forming apparatus, barrier-film forming method, and barrier-film coated container

a technology of barrier film and forming method, which is applied in the direction of packaging foodstuffs, transportation and packaging, packaged goods types, etc., can solve the problems of difficult to realize such a similar shape, inability to obtain the barrier property for practical use, and the non-uniformity of formed films is greatly increased. achieve the effect of high barrier property

Inactive Publication Date: 2015-04-23
MITSUBISHI HEAVY IND MACHINERY SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a solution to the problem of non-uniform voltage distribution when applying an electrical charge to containers for the formation of high-quality gas barrier thin films. The invention uses a dielectric member between the external electrode and the container to achieve a uniform voltage distribution and to form a high barrier property on the inner face of the container. This results in a more cost-effective and efficient production process, as well as improved product quality.

Problems solved by technology

However, when the apparatus has a configuration in which the container is inserted longitudinally, it is difficult to realize such a similar shape.
In such cases, nonuniformity of the formed film is greatly increased, and therefore the barrier property for practical use cannot be obtained.

Method used

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  • Barrier-film forming apparatus, barrier-film forming method, and barrier-film coated container
  • Barrier-film forming apparatus, barrier-film forming method, and barrier-film coated container
  • Barrier-film forming apparatus, barrier-film forming method, and barrier-film coated container

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first embodiment

[0104]A barrier-film forming apparatus according to a first embodiment of the present invention will be explained with reference to the accompanying drawings.

[0105]FIG. 1 is a conceptual diagram of the barrier-film forming apparatus according to the present embodiment. The same members as those in the barrier-film forming apparatus according to the conventional technique explained with reference to FIG. 38 are denoted by like reference numerals and redundant explanations thereof will be omitted.

[0106]As shown in FIG. 1, a barrier-film forming apparatus 10 according to the present embodiment forms a barrier film on an inner face of a processing target, which is the plastic container (hereinafter, also “container”) 12 having at least one concave or convex portion 12a. The barrier-film forming apparatus 10 includes a dielectric member 50 that has a cavity sized to enclose at least a major portion of the container 12, the external electrode 13 that covers an outer circumference of the d...

second embodiment

[0229]FIG. 16 is a schematic diagram of a barrier-film forming apparatus according to another embodiment of the present invention.

[0230]As shown in FIG. 16, the shape of the container 12 is changed to have a circular cross section, and the clearance 51 is at least 3 millimeters.

[0231]According to the present embodiment, even when the clearance 51 between the dielectric member 50 and the container 12 is increased, a uniform and satisfactory film (having the BIF fifteen times higher or a higher BIF) can be formed on the inner face of the container.

third embodiment

[0232]FIG. 17 is a schematic diagram of a barrier-film forming apparatus according to still another embodiment of the present invention.

[0233]As shown in FIG. 17, the shape of the container 12 is changed to have a circular cross section, and the clearance 51 is at least 1 millimeter.

[0234]A dielectric member 62 of a convex shape corresponding to a concave portion 12b at the bottom of the container is further provided.

[0235]According to the present embodiment, uniform film formation can be achieved also at the concave portion 12b at the bottom of the container, as well as the concave portion 12a at the body of the container.

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Abstract

A barrier-film forming apparatus that forms a barrier film on an inner face of a container having a concave or convex portion as a processing target, including: a dielectric member having a cavity sized to enclose the container, an external electrode covering an outer circumference of the dielectric member, an exhaust unit installed on an end face of the external electrode on a side where a mouth of the container is located, with an insulating member interposed therebetween, and depressurizing inside of the container through an exhaust pipe, an internal electrode inserted from a side of the exhaust pipe and also serving as a gas blowout unit that blows out medium gas for generating a barrier film into the container, and an electric-field applying unit that applies an electric field for generating exhaust between the external electrode and a ground electrode.

Description

BACKGROUND OF THE INVENTION[0001]I. Technical Field[0002]The present invention relates to a barrier-film forming apparatus, a barrier-film forming method, and a barrier-film coated container for uniformly forming a barrier film that provides a gas barrier property to a resin container, for example.[0003]II. Description of the Related Art[0004]Recently, an approach has been adopted to coat an inner face of a polyethylene terephthalate (PET) bottle, which is one type of plastic containers, with a film having a high barrier property, for example a carbon film such as diamond-like carbon (DLC) or a silica film, to prevent transmission of external oxygen or transmission of internal carbon dioxide (for example, from carbonated beverage). Various film depositing apparatuses for that purpose are proposed (Japanese Patent Application Laid-open No. H8-53116, Japanese Patent No. 2788412 (Japanese Patent Application Laid-open No. H8-53117), WO2003 / 101847, Japanese Patent No. 3643813 (Japanese P...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C16/503B65D25/14
CPCB65D25/14C23C16/503B65D23/02C23C16/045C23C16/509H01J37/32348H01J37/32623C23C16/50
Inventor ASAHARA, YUJIYAMAKOSHI, HIDEODANNO, MINORUGOTO, SEIJISHIRAKURA, AKIRANAKAYA, MASAKIHIROYA, KIYOSHI
Owner MITSUBISHI HEAVY IND MACHINERY SYST LTD
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