Injection molding machine and injection molding method
Pending Publication Date: 2022-01-20
SODICK CO LTD
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Benefits of technology
[0027]According to an embodiment of the disclosure, by arranging the porous plate on the flow path from the inside of the plastication cylinder to the injection chamber, the melted resin passes through the plurality of pores to reciprocally move, and thereby the melted resin is dispersed and stirred, and kneading property can be further improved.
[0028]According to the disclosure, in the plasticization metering step, the injection plunger repeatedly moves forward and backward, and furthermore, the plastication screw alternately rotates in the normal rotation direction and the reverse rotation direction. Thereby, the melted resin reciprocally moves between the injection chamber and the plastication cylinder, and the plasticization melting of the melted resin is promoted. By using the configuration described above, the plastic resin and the compounding agent can be uniformly mixed without drastically changing the structure of the existing screw preplasticating injection device, and the molding can be easily performed even if the hard-to-mold resin having high melt temperature and high melt viscosity is used.
Problems solved by technology
However, due to high melt temperature and high melt viscosity of the high filling compounding resin composition, plasticization is extremely difficult for high filling compounding resin composition which contains a large number of filling materials such as a thermoplastic resin, a reinforcing fiber, or the like of liquid-crystal polymer type, polyphenylene sulfide type, or the like being the type of the super engineering plastic.
Furthermore, the resin composition is difficult to be uniformly molded by normal extrusion molding or injection molding.
In addition, when a compounding agent such as the coloring agent or the like is introduced as a masterbatch pellet into an injection molding machine together with a desirable thermoplastic resin to manufacture a predetermined molded product, if kneading with the thermoplastic resin is insufficient, problems are caused such as non-uniform plasticization, color unevenness of the molded product, and the like.
Thus, various efforts are taken in order to improve a problem that injection molding of a hard-to-mold resin is difficult or a problem that dispersive mixing of the compounding agent to thermoplastic resin is insufficient.
Method used
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[0075]The injection molding machine 100 in the second embodiment of the disclosure is equipped with the porous plate 70 on the flow path of the melted resin in order to improve kneading property, and other configurations of the injection molding machine 100 are the same as those of the injection molding machine 1 of the first embodiment. Thus, elements having the same function and configuration are marked with the signs the same as those of the first embodiment, and descriptions thereof are omitted.
[0076]The porous plate 70 of the disclosure is a disk-shaped plate arranged on the flow path of the melted resin, and a number of pores 71a having predetermined diameters penetrating in a thickness direction are arranged in a center section 71. The porous plate 70 is arranged in a way of standing relative to a direction of the flow path of the melted resin to allow the melted resin to pass through the inside of the pores 71a. In the embodiment, the porous plate 70 is arranged between the inj
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Provided are an injection molding machine and an injection molding method. An injection molding machine includes: a plasticizing unit which rotates a screw to plasticize a molding material inside a plastication cylinder, and an injection unit. The injection unit has: a plunger reciprocally moving inside an injection chamber, and an injection driving device reciprocally moving the plunger. By driving the injection driving device to move the plunger backward and forward inside the injection chamber, and driving a rotary driving device to alternately rotate the screw in a normal rotation direction and a reverse rotation direction, the molding material is controlled to reciprocate between the plastication cylinder and the injection chamber.
Description
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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