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PET container for foods and drinks containing recycled resin and having DLC coating film formed on surface thereof

a technology of recycled resin and pet containers, which is applied in the field of plastic containers, can solve the problems of high required cost of low molecular conversion process resin, high cost of low molecular conversion process, and high risk of contamination, and achieve sufficient fundamental container properties, and sufficient contaminant elution barrier properties.

Inactive Publication Date: 2005-12-01
HAMA KENICHI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The DLC film coated PET containers achieve sufficient contaminant elution barrier properties, maintaining container strength and moldability, and allowing for the reuse of recycled PET containers in food and beverage applications without excessive cost, while minimizing the impact of colored impurities and ensuring gas barrier properties.

Problems solved by technology

Namely, in general after a food container package is consumed / used for the original purpose, due to contact with a foreign substance and foreign substance mixing and the like in the use for another purpose, unexpected misuse, or discarding / recycling process, a risk of contamination is expected due to the unknown substance.
However, with regard to the system of {circle over (1)}, it is built at the same time recycled products flow to market, and with regard to {circle over (2)}, it is difficult to find fundamental users of recycled products as restrictions are made to use.
With regard to {circle over (3)}, the required cost for the process of low molecular conversion of resin is high, and becomes disadvantageous by a cost comparison with new resin.

Method used

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  • PET container for foods and drinks containing recycled resin and having DLC coating film formed on surface thereof

Examples

Experimental program
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Effect test

example embodiments

Example Embodiment 1

[0048] A description will be given for the results of testing the effectiveness of contaminant elution inhibition of PET containers for foods and beverages containing recycled resin.

[0049] Because used PET in the city is found in various contaminated states, model contaminants were mixed with unused PET flakes to form PET flakes contaminated with model contaminants, and pseudo used PET pellets were created, and then these pseudo used PET pellets and unused PET pellets were used to form a container which was then evaluated.

[0050] In general, the contaminants of plastic can be thought to form the following four types of substances: {circle over (1)} substances which are volatile and polar; {circle over (2)} substances which are volatile and nonpolar; {circle over (3)} substances which are nonvolatile and nonpolar; and {circle over (4)} substances which are nonvolatile and polar. In this test, {circle over (1)} toluene (C6H5 CH3, hydrocarbon, volatile, nonpolar),...

example embodiment 2

[0067] Next, with reference to the case of II of Table 4, a description will be given for the relationship between the oxygen permeability of the DLC containers and the amount of elution of the contaminants.

[0068] First, using the high concentration pellets after solid phase polymerization, a contaminated PET container (Experiment Number 1, no DLC film coating) having a 500 ml volume was created, and by changing the above-described vapor deposition conditions for the inner wall surface of the contaminated PET to form a DLC film on the inner wall surfaces of contaminated PET containers, a plurality of DLC containers (Experiment Numbers 2˜9) having different oxygen permeabilities were created.

[0069] As shown in Table 5, the oxygen permeability of the contaminated PET (Experiment Number 1) in a state where a DLC film was not formed was 0.033 ml / day / container. Further, the oxygen permeabilities of the DLC containers (Experiment Numbers 2˜9) created by changing the vapor deposition con...

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Abstract

A PET container for foods and drinks having a DLC coating film formed on the inner surface thereof, characterized in that the PET container for foods and drinks is produced by the use of a molding material comprising a mixture of a recycled resin which is originated from a used PET container for foods and drinks and has not subjected to a treatment for adjusting its intrinsic viscosity with a fresh PET resin. The above PET container for foods and drinks can provide satisfactory barrier properties against a pollutant substance being present in a resin.

Description

[0001] This application is a divisional application of Ser. No. 10 / 149,336, filed Jun. 6, 2002.TECHNICAL FIELD [0002] The present invention is related to a plastic container adapted for use as a food container or the like, and in particular to a plastic container containing recycled PET resin which makes it possible for the resin of a used PET (polyethylene terephthalate) container for foods and beverages to be recycled and used again as a plastic container for foods and beverages, and a manufacturing method thereof PRIOR ART TECHNOLOGY [0003] Japanese Laid-Open Patent Publication No. HEI 8-53117 discloses a vapor deposition apparatus which uses CVD (Chemical Vapor Deposition, chemical vapor growing method), in particular, a plasma CVD method to vapor deposit a DLC (Diamond Like Carbon) film on the inner surface of a plastic container in order to improve the gas barrier properties and the like of containers such as containers for carbonated beverages and high fruit juice beverages a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65D1/02C08J11/06
CPCB65D1/0207Y10T428/1352C08J2367/02C08J11/06Y02W30/62
Inventor HAMA, KENICHIKAGE, TSUYOSHI
Owner HAMA KENICHI
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