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Roll plasticizing shaping method of large plastic product and its special mould

A technology of plastic products and rotational molding, applied in the direction of coating, etc., can solve the problems of molten material flow, affecting the strength of products, etc., to achieve the effect of good quality, overcoming adverse effects, and high strength

Inactive Publication Date: 2004-12-22
ZHEJIANG JIANGNENG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the inner cavity of the mold adopts a smooth surface, it is easy to cause the flow of the molten material during the molding process, which greatly affects the uniformity of the wall thickness and directly affects the strength of the product. Therefore, the existing ordinary rotational molding equipment and molds with smooth inner walls cannot produce this kind of mold. Complicated and qualified products with large slopes must use special molds

Method used

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  • Roll plasticizing shaping method of large plastic product and its special mould
  • Roll plasticizing shaping method of large plastic product and its special mould
  • Roll plasticizing shaping method of large plastic product and its special mould

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Embodiment Construction

[0020] The rotomolding method of large-scale plastic products provided by the present invention is divided into two types (1) special equipment is selected, that is, the mold rotation and swing range are 360 ​​degrees (that is, two-way rotation of 360 degrees), and electricity or oil is used as a heat source in an oven. Heating; (2) Use ordinary equipment, that is, the mold is rotated 360 degrees, and the swing range is less than 300 degrees, and the mold is heated with gas. The molding of ordinary equipment is decomposed into the following steps in sequence: (take three feedings as an example)

[0021] (1) Feeding into the mold for the first time: the feeding amount is 40%-50% of the total feeding amount;

[0022] (2) The first plasticization: the mold speed is 20-40 rpm, the swing range is 0-180 degrees, and the external heating temperature is 110-160 degrees Celsius;

[0023] (3) feeding into the mold for the second time: the feeding amount is 20%-30% of the total feeding ...

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Abstract

A rolling moulding method for preparing large plastic product features that the rotating and swinging 360 deg. apparatus and the special mould with flow-damping structure (semispherical bosses, spherical bosses or step bosses) are used. Its product features high thickness, uniformity and strength.

Description

technical field [0001] The invention relates to the manufacture of plastic products, in particular to a rotational molding method of large plastic products and a special mold thereof. Background technique [0002] Rotational molding is a commonly used method for forming plastic products, especially for large-scale products that do not require high precision, and are often formed by this method. For products with thick molded products and slopes (greater than 20 degrees), there are two ways to use (1) use special equipment to make the mold rotate and swing at 360 degrees (both two-way 360 degrees) equipment ( figure 1 )(2) Use ordinary rotational molding equipment, that is, the mold rotates 360 degrees, and the swing range is less than 300 degrees. If the inner cavity of the mold adopts a smooth surface, it is easy to cause the flow of the molten material during the molding process, which greatly affects the uniformity of the wall thickness and directly affects the strength ...

Claims

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Application Information

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IPC IPC(8): B29C41/06
Inventor 房华江
Owner ZHEJIANG JIANGNENG ENVIRONMENTAL PROTECTION TECH
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