Plastic container having pearl-like appearance and process for producing the same

A technology for plastic containers and manufacturing methods, applied in the directions of containers, rigid containers, flexible coverings, etc., can solve the problems of inability to use, low productivity, and increased manufacturing costs, and achieves increased gloss, improved strength, and imparted surface smoothness. Effect

Active Publication Date: 2008-07-16
TOYO SEIKAN KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, this method requires molding the body, bottom, and mouth separately, resulting in low productivity and increased manufacturing costs, making it impractical from an industrial point of view.

Method used

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  • Plastic container having pearl-like appearance and process for producing the same
  • Plastic container having pearl-like appearance and process for producing the same
  • Plastic container having pearl-like appearance and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] A non-foamed preform for a 500 ml bottle having a body wall thickness of 3 mm was produced by injection molding using homopoly PET (polyethylene terephthalate) having an intrinsic viscosity (IV) of 0.84 dL / g.

[0114] The preform was placed in a pressure-resistant container at 40° C., maintained at a pressure of 15 MPa for 1 hour, and impregnated with carbon dioxide gas. Then, the pressure was reduced to atmospheric pressure, and the preform was taken out from the pressure vessel, and kept under atmospheric pressure for 5 minutes. Further, spray hot water at 90° C. for 10 seconds on the outside of the preform to make it foam, and obtain a unit density of 8.5×10 7 unit / cm 3 , a foamed layer with a thickness of 180 μm, and a foamed preform having a skin layer with a thickness of 70 μm on its outer surface.

[0115] At this time, the cell density was calculated from the cross-sectional photograph using the following formula.

[0116] N f =(n / A) 3 / 2

[0117] N f : un...

Embodiment 2

[0129] The foamed preform produced by the same method as in Example 1 was blow-molded into a bottle shape with a draw ratio equivalent to 3 times in length and 3 times in width, and the average wall thickness of the container in the side wall was 0.32 mm, The foamed PET bottle has an average surface roughness Ra of 0.3 μm, a skin layer thickness of 10 μm, an average long diameter of bubbles in the foam layer of 42 μm, an average aspect ratio of 11.6, and excellent appearance and pearl-like luster.

Embodiment 3

[0131] Using a copolymerized PET with an intrinsic viscosity (IV) of 0.90 dL / g containing 5 mol% of isophthalic acid, an average wall thickness of 0.58 mm and a cell density of 4×10 6 unit / cm 3 A foamed sheet with almost spherical cells. At this time, by properly controlling the temperature of the T-die, the surface of the sheet can be smoothed. The foamed sheet obtained as described above is stretched vertically 2 × horizontally 2 times with a biaxial stretching machine, it is heat-sealed, and when it is made into a bag-shaped container, the average wall thickness of the container is 0.16 mm, and the average surface roughness Ra was 4.3 μm, the average major diameter of the cells in the foam layer was 101 μm, the average aspect ratio of the cells was 8.4, and the bag had a smooth surface and good appearance and pearly luster.

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Abstract

This invention provides a plastic container characterized in that an expanded layer comprising expanded cells having a flat shape with an average major axis of not more than 400 [mu]m and an average aspect ratio (L / t) of not less than 6 as viewed in cross section of the container wall along the maximum stretch direction, which are oriented in the stretch direction and are distributed so as to be superimposed on top of each other in the thickness-wise direction, is formed within the container wall. In this container, expanded cells having a flat shape are distributed so as to orient in a given direction and, thus, has light shielding properties and has a pearl-like appearance, that is, has a very high commercial value. Further, since any colorant is not contained, the suitability for recycling is also excellent.

Description

technical field [0001] The invention relates to a plastic container with foaming units distributed in the wall, a pearl-like appearance imparted by the foaming units and a method for its manufacture. Background technique [0002] Conventionally, it is known that a plastic container obtained by molding a resin composition in which a scaly inorganic pigment (such as talc) is dispersed has a pearly (pearl-like) appearance. That is, the flaky pigments scatter and reflect light inside the container wall. The above-mentioned plastic container having a pearl-like appearance has a high commercial value. [0003] On the other hand, in recent years, the recycling of resources has been strongly demanded, and the above-mentioned polyester containers have also begun to collect used containers and use them for various purposes as recycled resins. The above-mentioned plastic containers having a pearly appearance are not suitable for recycling. The reason is that in order to impart a pea...

Claims

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Application Information

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IPC IPC(8): B65D1/00B29B11/14B29C49/02B29C51/02B65D1/40B65D65/02
CPCB29B2911/1402B29B2911/14026B29B2911/14033B29B2911/1404B29B2911/14053B29B2911/14066B29B2911/1408B29B2911/14093B29B2911/14106B29B2911/14113B29B2911/14133B29B2911/1414B29B2911/1416B29B2911/14166B29B2911/14213B29C2949/3016B29C2949/302B29C2949/3024B29C2949/28B29C2949/26B29C2949/24B29C2949/22B29C2949/3008B29C2949/3026B29C2949/3012B29C2949/3041B29C2949/3034B29C2949/3042B29C2949/3056B29C2949/3032
Inventor 市川健太郎小矶宣久
Owner TOYO SEIKAN KAISHA LTD
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