Method for deriving bulk viscosity of molding material
a molding material and bulk technology, applied in the field of deriving bulk viscosity of molding materials, can solve the problems of large number of trial molding operations, long setting time, and difficulty in forming products of consistent quality, and achieve the effect of bulk viscosity
Inactive Publication Date: 2021-07-15
CORETECH SYST CO LTD
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Benefits of technology
The present patent provides a method for deriving the bulk viscosity of a molding material by measuring the pressure, volume, and temperature of the material under different cooling rates and mechanical pressures. The method involves deriving a plurality of parameters in relation to the pressure and cooling rate, and then using these parameters to calculate the specific volume and rate of volume change of the material. The resulting bulk viscosity can be used to control the molding process and improve the quality of the molded material. The method is particularly useful for measuring the viscosity of molding materials during cooling rates that vary from slow to fast.
Problems solved by technology
Therefore, it is difficult to form products of a consistent quality.
In general, the setting of molding conditions of the injection molding machine requires a large number of trial molding operations and a long setting time because the setting work greatly depends on the know-how and experience of an operator of the injection molding machine, and various physical values affect one another as well.
Method used
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[0040]The following description of the disclosure accompanies drawings, which are incorporated in and constitute a part of this specification, and illustrate embodiments of the disclosure, but the disclosure is not limited to the embodiments. In addition, the following embodiments can be properly integrated to complete another embodiment.
[0041]References to “one embodiment,”“an embodiment,”“exemplary embodiment,”“other embodiments,”“another embodiment.” etc. indicate that the embodiment(s) of the disclosure so described may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes the particular feature, structure, or characteristic. Further, repeated use of the phrase “in the embodiment” does not necessarily refer to the same embodiment, although it may.
[0042]The present disclosure is directed to a method for deriving a bulk viscosity of a molding material. In order to make the present disclosure completely comprehensible, detailed st...
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Abstract
The present disclosure provides a method for deriving a bulk viscosity of a molding material. The method includes a step of deriving a plurality of parameters in relation to pressures, specific volumes and temperatures (PVT) of the molding material under a plurality of cooling rates and a plurality of mechanical pressures; deriving an equilibrium pressure based on the plurality of parameters obtained from a first slowest cooling rate among the plurality of cooling rates; deriving a rate of volume change of the molding material; and obtaining the bulk viscosity of the molding material based on the rate of volume change.
Description
PRIORITY CLAIM AND CROSS-REFERENCE[0001]This application claims the benefit of provisional application Ser. 62 / 960,201 filed on Jan. 13, 2020 and the benefit of Provisional Patent Application No. 62 / 960,206, filed on Jan. 13, 2020, the disclosure of which are hereby incorporated by reference in its entirety.TECHNICAL FIELD[0002]The present disclosure relates to a method for deriving a bulk viscosity of molding material, and more particularly, to a method for deriving the bulk viscosity of molding material under different cooling rates and different mechanical pressures.DISCUSSION OF THE BACKGROUND[0003]Injection molding is a technology commonly used for high-volume manufacturing of parts made of synthetic resin, most commonly made of thermoplastic polymers. During a repetitive injection molding process, a plastic resin, most often in the form of small beads or pellets, is introduced to an injection molding machine that melts the resin beads under heat, pressure, and shear. The resul...
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IPC IPC(8): B29C45/76G01N11/00G01N25/16
CPCB29C45/7693B29C45/7646B29C45/766G01N11/00G01N25/16B29C2945/76434B29C2945/76006B29C2945/76107B29C2945/7604B29C2945/76287B29C2945/76053B29C45/0046B29C45/77G06F30/28G06F2113/22B29C2945/76859
Inventor CHANG, YUAN-JUNGCHANG, RONG-YEUWANG, CHEN-CHIEHHSU, CHIA-HSIANG
Owner CORETECH SYST CO LTD