Laminated formed body and method of manufacturing the formed body

Abstract

A laminated and molded body obtained by coextruding and molding at least two kinds of resin materials is preferable as a blow-molding aimed preform, a direct-blow molded bottle, a tube, or a blow molded tube, and has at least one layer constituted of a colored layer having a thickness continuously or intermittently varied in a direction parallel to the extruding direction of the at least one layer and / or in another direction intersecting the extruding direction, thereby enhancing the gradation effect.

Description

technical field [0001] The present invention relates to a laminated product such as a blow molding preform obtained by co-extruding these materials using various synthetic resins as a material, a direct blow molded bottle, etc., and a method for producing the laminated product. There is a change in the color tone, seeking to further improve the appearance. Background technique [0002] In terms of synthetic resin containers for cosmetics, molded products molded by injection molding or blow molding of synthetic resins are widely used from the viewpoint of being suitable for mass production and reducing production costs. Most of the molded products have a single color tone or little change in color tone, which is not enough from the viewpoint of the appearance of the container. [0003] Therefore, in recent years, for example, as described in JP-A-2000-117820, regarding the aspect of imparting color to containers, a so-called method with a color shading effect, which increase...

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Problems solved by technology

[0005] However, in the above-mentioned prior art, since the wall thickness difference is provided on the parison, the blow molded product also has the same wall thickness distribution as the parison, and it is difficult to control the wall thickness during blow molding. Thick and particularly thin parts will affect the strength of the container due to the decrease in rigidity. At the same time, the shelf life of the contents will be shortened due to the easy intrusion of external gas (oxygen, etc.), making it difficult to stably produce high-quality molding. Moreover, when it is desired to maintain rigidity as a whole, the wall thickness of the darker part will exceed the required rigidity, and unnecessary wall thickness will lead to problems such as increased cost, which requires further improvement

[0006] This shows that above-mentioned existing molded product and manufacturing method thereof obviously still have inconvenience and defect in structure, method and use, and urgently need to be further improved

In order to solve the problems existing in molded products and their manufacturing methods, relevant manufacturers have tried their best to find solutions, but no suitable design has been developed for a long time, and there is no suitable structure for general products to solve the above problems , this is obviously a problem that the relevant industry is eager to solve

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