Molding technology for controlling wall thickness distribution of hollow-blow-molded product through temperature of machine head

A technology of temperature control and molding process, applied in the field of hollow blow molding, it can solve problems such as uneven wall thickness distribution, and achieve the effect of good smoothness and gloss, and uniform wall thickness distribution

Inactive Publication Date: 2016-01-27
天津市科润特包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The uneven distribution of the wall thickness of the parts has become a bottleneck restricting the development of extrusion blow molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The molding process of controlling the wall thickness distribution of hollow blow molding products by the temperature of the machine head, the process conditions are as follows:

[0020] Die temperature is 170°C;

[0021] Barrel temperature 1 to 5 are 165°C, 170°C, 170°C, 175°C, 180°C respectively;

[0022] The mold temperature is 40-80°C;

[0023] The inflation pressure is 0.6~0.8MPa;

[0024] The blowing time is 20s; the cooling time is 40s; the pick-up time is 10s; the molding cycle is 80s;

[0025] The extruder is single-screw type, the extruder head is piston type, and the extrusion rate is 100-180cm3 / s.

[0026] The molding process of controlling the wall thickness distribution of the hollow blow molded product by the temperature of the machine head in this embodiment includes the following steps:

[0027] First, the opened blow mold is moved to the bottom of the extruder head, and the parison is extruded in the two-part blow mold. After reaching the required ...

Embodiment 2

[0029] The molding process of controlling the wall thickness distribution of hollow blow molding products by the temperature of the machine head, the process conditions are as follows:

[0030] Die temperature is 180°C;

[0031] Barrel temperature 1 to 5 are 165°C, 170°C, 170°C, 175°C, 180°C respectively;

[0032] The mold temperature is 40-80°C;

[0033] The inflation pressure is 0.6~0.8MPa;

[0034] The blowing time is 20s; the cooling time is 40s; the pick-up time is 10s; the molding cycle is 80s;

[0035] The extruder is single-screw type, the extruder head is piston type, and the extrusion rate is 100-180cm3 / s.

[0036] The specific steps of the molding process of controlling the wall thickness distribution of the hollow blow molded product in this embodiment are as in Embodiment 1.

Embodiment 3

[0038] The molding process of controlling the wall thickness distribution of hollow blow molding products by the temperature of the machine head, the process conditions are as follows:

[0039] Die temperature is 190°C;

[0040] Barrel temperature 1 to 5 are 165°C, 170°C, 170°C, 175°C, 180°C respectively;

[0041] The mold temperature is 40-80°C;

[0042] The inflation pressure is 0.6~0.8MPa;

[0043] The blowing time is 20s; the cooling time is 40s; the pick-up time is 10s; the molding cycle is 80s;

[0044] The extruder is single-screw type, the extruder head is piston type, and the extrusion rate is 100-180cm3 / s.

[0045] The specific steps of the molding process of controlling the wall thickness distribution of the hollow blow molded product in this embodiment are as in Embodiment 1.

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PUM

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Abstract

The invention relates to a molding technology for controlling wall thickness distribution of a hollow-blow-molded product through the temperature of a machine head, and belongs to the technical field of hollow blow molding. The technological conditions are characterized in that the temperature of an opening mold ranges from 170 DEG C to 200 DEG C; the temperature of a first section of a barrel is 165 DEG C, the temperature of a second section of the barrel is 170 DEG C, the temperature of a third section of the barrel is 170 DEG C, the temperature of a fourth section of the barrel is 175 DEG C, and the temperature of a fifth section of the barrel is 180 DEG C; the temperature of a mold ranges from 40 DEG C to 80 DEG C; the blowing-up pressure ranges from 0.6 MPa to 0.8 MPa; the blowing time is 20 s; the cooling time is 40s; the piece taking time is 10 s; the molding cycle is 80 s; and an extruding machine is in a single-screw type, an extruding machine head is in a piston type, and the extrusion rate ranges from 100 cm<3> / s to 180 cm<3> / s. By means of the molding technology, the wall thickness distribution of the manufactured piece can be even, quality can be good, the surface can be smooth, and glossiness can be good.

Description

technical field [0001] The invention relates to the technical field of hollow blow molding, in particular to a molding process for controlling the wall thickness distribution of hollow blow molded products by the temperature of the head. Background technique [0002] At present, hollow blow molding is the third largest plastic molding method after extrusion molding and injection molding, and it is the fastest growing plastic molding method. Compared with other molding methods, blow molding equipment has low cost, strong adaptability, and can form products with high performance and complex shapes. [0003] Part wall thickness distribution is the main index to evaluate the quality of blow molded parts. If the wall thickness is too thick, the production cost will be increased, and the production efficiency will be reduced due to the prolongation of the cooling time; if the wall thickness is too thin, the part will be blown during blow molding or its mechanical properties will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C49/04B29C49/78
Inventor 王守芳
Owner 天津市科润特包装有限公司
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