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Preforms with concave bottom and variable thickness

A technology of preforms and recesses, which is applied in the field of preforms to manufacture containers, which can solve the problems of unstable mechanical strength of the bottom of the container and reduction of safety distance, etc.

Active Publication Date: 2020-08-11
SIDEL PARTICIPATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the case of containers, this memory effect can produce undesirable deformations on the bottom of the container, which thus becomes unstable and its mechanical strength is reduced, while the safety distance is reduced (i.e. the center of the bottom and the distance measured axially between the placement planes of the

Method used

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  • Preforms with concave bottom and variable thickness
  • Preforms with concave bottom and variable thickness
  • Preforms with concave bottom and variable thickness

Examples

Experimental program
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Embodiment Construction

[0065] figure 1 , 2 and 3 each show a preform 1 made of plastic material such as PET (polyethylene terephthalate), a container 2 (such as Figure 8 shown) is formed from the preform by blow molding or stretch blow molding. Firstly, each preform 1 has a main body 3 extending symmetrically about a central axis X in rotation. According to an advantageous embodiment suitable for most applications, the body 3 is cylindrical.

[0066] The body 3 of the preform 1 is used to form a container 2 (partially shown in Figure 8 ) of the main body 4 and shoulders (not shown).

[0067] Next, each preform 1 has an open neck 5 extending from the upper end of the body following the body 3 . The neck 5 has its final shape, which it retains throughout the molding process and lifetime of the container 2 .

[0068] Advantageously, the neck 5 is separated from the body 3 by a radially protruding flange 6, during the various operations of conveying, heating of the preform 1, or shaping of the c...

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PUM

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Abstract

The invention relates to a preform (1) for a container made of plastic material, comprising: a body (3) that is rotationally symmetrical about a central axis (X), an open neck extending from the upper end of the body The part starts to continue the main body (3) and extends, and a bottom part (7), which closes the main body (3) from the lower end part (8) of the main body, the bottom part (7) is rotationally symmetrical about the central axis (X) and has a central recess (9). ) and a raised flange (10) around this recess (9), the bottom (7) having a thickness E measured from the outer surface (17), the thickness of the bottom with the The three parts are a central part [0; S 1 ], a middle part [S 1 ;S 2 ] and a peripheral section [S 2 ;L].

Description

technical field [0001] The invention relates to the manufacture of containers from preforms of thermoplastic material, especially polyethylene terephthalate (PET). [0002] More precisely, the invention relates to a preform for forming a container by blow molding or stretch blow molding in a mold having a cavity for the container. Background technique [0003] The container generally has a side wall, generally symmetrical in revolution, extending along a central axis, a neck and a bottom, the neck extending in succession from the side wall, from which the container is intended to be filled and emptied , the bottom extending transversely from the lower end of the main body, the container is adapted to be placed on a flat surface by the bottom. [0004] The preform generally has a body having a substantially cylindrical shape (for forming the side wall of the container), an open neck starting from the upper end of the body, and a bottom The main body is extended, separated b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B11/14
CPCB29C49/06B29B11/14B29C2949/26B29C2949/24B29C2949/28B29C2949/22B29C2949/0725B29C2949/078B29C2949/0818B29C2949/0827B29C2949/0846B29C49/071B29C2949/0715
Inventor C·布内尔
Owner SIDEL PARTICIPATIONS SAS