MOLDING METHOD OF CRYSTALLINE PLASTICS

Abstract

A molding method of crystalline plastics includes: providing a raw material; executing a thermoforming step; executing a cooling crystallization step; and executing a cooling and demolding step to form a crystalline plastic product, and a staged cooling technology is used to achieve the effect of simultaneously performing the cooling crystallization step and the cooling and demolding step in a mold. The molding method does not require an expensive cooling system, nor require an additional crystallizer, and the method can improve the process yield, lower the required equipment and labor costs and expenses, and reduce the total process time significantly.

Claims

1. A molding method of crystalline plastics, comprising: providing a raw material; performing a thermoforming step that heats the raw material to a molding temperature and forms a product in a mold; performing a cooling crystallization step that cools the same mold to a crystallization temperature after molding to crystallize and shape the product still has not been crystallized yet; and performing a cooling and demolding step that further cools the same mold to room temperature after the cooling crystallization of the product, so as to facilitate demolding after molding.

2. The molding method of crystalline plastics as claimed in claim 1, wherein the raw material is a PET preform with the molding temperature of 290° C.˜315° C. and the crystallization temperature of 120° C.˜220° C., and the crystallization temperature is maintained for 1˜10 minutes.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0018] FIG. 1 is a flow chart of a conventional molding process of crystalline plastics; and

[0019] FIG. 2 is a flow chart of a molding method of crystalline plastics of the present disclosure.

DESCRIPTION OF THE EMBODIMENTS

[0020] In the description and drawings of this disclosure of a molding method of crystalline plastics in accordance with an exemplary example, the terms “front and rear”, “left and right”, “top and bottom”, “upper part and lower part”, and “horizontal and vertical” are provided for reference and used to describe and illustrate the present disclosure only, but not intended for limiting the scope of the present disclosure or limiting any position, space or direction of the components. It is noteworthy that the dimensions specified in the drawings and specification can be changed according to the design requirement of the exemplary examples of the present disclosure without departing from the scope of the claims of this disclosure.

[0021] With reference to FIG. 2 for a method of crystalline plastics in accordance with the present disclosure molding, the method comprises: providing a raw material; executing a thermoforming step; executing a cooling crystallization step; executing a cooling and demolding step to form a crystalline plastic product.

[0022] The detailed specification of the present disclosure is in accordance with FIG. 2. The molding method of PET bottles is the main embodiment. The molding method of PET bottles comprises:

[0023] providing a raw material such as a perform being molded beforehand;

[0024] performing a thermoforming step that heats the preform to a molding temperature (such as 290° C.˜315° C.) and uses a bottle blowing technology to expand the preform inside the same mold into a bottle body of a predetermined size;

[0025] performing a cooling crystallization step that cools the same mold to a crystallization temperature (such as 120° C.˜220° C.) by a temperature controller installed in the mold after the preform is blown and molded into a bottle body and maintains the crystallization temperature for 1˜10 minutes, so as to crystallize and shape the bottle body that has not been crystallized yet; and

[0026] performing a cooling and demolding step that further cools the same mold to room temperature (such as 20° C.˜30° C.) after the cooling crystallization of the bottle body, so as to facilitate demolding the molded bottle body to produce a complete bottle body.

[0027] From the description above, the molding method of crystalline plastics of the present disclosure uses a staged cooling technology to achieve the effects of cooling crystallization and cooling and demolding. The molding method does not require any expensive cooling system or additional crystallizer to lower the equipment cost, and the method can simplify the manufacturing process to save labor and process time, while improving the process yield, performance, efficiency and product quality, saving spaces, improving the raw material, finished goods and capital turnover rates, and increasing profitability and competitiveness significantly. This method surely provides economic benefits for industrial applications.

[0028] In summation of the description above, the present disclosure is an innovative invention, not just solving the problems of the prior art only, but also making significant improvements, and the invention is novel, inventive, and in compliance with patent application requirements, and thus is duly filed for patent application.