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Method and mold for manufacturing biodegradable molded articles

a biodegradable and mold technology, applied in the field of expanded molded article manufacturing, can solve the problem of easy peeling, and achieve the effect of reducing labor for applying slip agents

Inactive Publication Date: 2008-06-12
NISSEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0040]The present invention takes the problems above into account, and hence the object is to provide a method and a mold to manufacture a biodegradable molded article having enough strength even with complicated shape, enough water resistance, a very excellent biodegradability, and an excellent surface smoothness, with ease and excellent accuracy of dimension.

Problems solved by technology

Moreover, according to the method above, the coating film is pressure-bonded to a surface of the biodegradable expanded molded article by heating and molding in the mold, so it is possible to obtain the biodegradable molded article of which the coating film is substantially adhered to the surface and cannot be easily peeled off from the surface.

Method used

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  • Method and mold for manufacturing biodegradable molded articles
  • Method and mold for manufacturing biodegradable molded articles
  • Method and mold for manufacturing biodegradable molded articles

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0117]An embodiment of the present invention is described below in accordance with FIGS. 1 to 18. By the way, the present invention is not limited to this embodiment.

[0118]First, a biodegradable molded article manufactured by a method of the present invention is described.

[0119]The biodegradable molded article manufacture by a method of the present invention contains a biodegradable expanded molded article of a specific shape obtained by molding a molding material through steam expansion, and a coating film attached to a surface thereof, said coating film being mainly made of a biodegradable plastic and having at least hydrophobicity.

[0120]In the above biodegradable molded article, it is preferable that a ratio of volume of air phase included in the biodegradable expanded molded article is more than 30 volume % of total volume of the biodegradable molded article. This increases a surface area of the biodegradable expanded molded article and helps to bring in microorganisms biodegrad...

embodiment 2

[0353]An embodiment of the present invention is described below based on FIG. 20 to FIG. 24. The present invention is not limited to this embodiment. For convenience of explanation, the members having the same function as each member shown in the above embodiment 1 have the same code with no explanation.

[0354]First, a biodegradable molded article manufactured by a method of this embodiment has a structure that a coating film is formed directly on a surface of an expanded molded article, as the biodegradable molded article manufactured by the method of Embodiment 1.

[0355]The method of this embodiment is a method to manufacture a biodegradable molded article of a deep drawing shape, or a method suitable to manufacture a biodegradable molded article of a deep drawing shape.

[0356]The biodegradable molded article of a deep drawing shape is, for example, the bowl-shaped container 10a shown in FIG. 2 explained in Embodiment 1, an almost similar bowl-shaped container such as the bowl-shaped...

example 1

[0407]For all of the combinations (16 combinations in total) of 8 molding materials (1) to (8) shown in Table 1 as the molding material 14 and two coating films F3 and F5 shown in Table 2 as the coating film 12, a round plate-shaped container 10b was manufactured by the method of Embodiment 1 explained with FIGS. 6(a) and 6(b).

[0408]Using the metal mold 20b having the exhaust holes 31b and 32b shown in FIGS. 6 (a) and 6 (b) and with the cavity 25b in uniform thickness of 2.5 mm (corresponding to thickness of the round plate-shaped container 10b), the molding material 14 is placed between a pair of coating films 12 in the metal mold 20b. Then, the metal mold is clamped by fitting the convex mold part 21b in the concave mold part 22b, the main body 11b is obtained by heating and molding the molding material 14 and the coating film 12 in the metal mold 20b and steam-expanding the molding material 14, and at the same time, the coating film 12 is softened and pressure-bonded to the surfa...

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Abstract

Using a metal mold (20a) consisting of a convex mold part (21a) and a concave mold part (22a), a molding material (14) is placed between a pair of coating films (12), and after claming, the molding material (14) and the coating film (12) are heated and molded to make a biodegradable expanded molded article, and at the same time, the coating film (12) is softened and pressure-bonded to a surface of the biodegradable expanded molded article. An exhaust hole (31a) and (32a) are provided on the convex mold part (21a) and the concave mold part (22a), respectively. At the time of heating and molding, gaseous matter existing between the coating film (12) and a surface of the metal mold (20a) is discharged out of the metal mold (20a) through the exhaust holes (31a) and (32a). Accordingly, it is possible to provide a method and a mold to manufacture a biodegradable expanded molded article easily and with excellent accuracy of dimension, having enough strength, enough water resistance, very excellent biodegradability and excellent surface smoothness even if the biodegradable molded article has a complicated shape.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for manufacturing an expanded molded article mainly made of starch and having biodegradability (biodegradable molded article), particularly to a method for manufacturing a biodegradable molded article that can be desirably used as a disposable expanded molded article that is disposed after the use such as a food container, a molding buffer material, GES and a wrapping tray, and to a mold used therefor. In addition, the present invention relates to a method for desirably manufacturing a biodegradable molded article with a deep drawing shape including a bowl-shaped or a cup-shaped biodegradable molded article using a substantially flat coating film.BACKGROUND ART[0002]As a disposal method for a molded article, a biodegradability disposal technique using microbe has been developed and in the spotlight. Especially, in the biodegradability disposal method above, a method to utilize natural high polymers such as starch and pro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B29C33/10B29C33/04C08J9/12B29C39/10B29C43/18B29C43/20B29C44/00B29C44/14B29C44/56B29K1/00B29K105/04C08J9/36C08L101/16
CPCB29C33/10B29C43/003B29C43/184B29C43/206B29C43/36B29L2031/712B29C44/3426B29C44/569B29K2105/04B29K2995/0059B29C44/14B29C39/10B29C44/00C08J9/12C08J9/36
Inventor OZASA, AKIOHASHIMOTO, AKIHISASHINOHARA, RUMITANAKA, SHINJISHINGU, TAKESHI
Owner NISSEI CO LTD
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