Injection molding method
A technology of injection molding and heating cylinder, applied in the direction of coating, etc., can solve the problem that water cannot be removed, there is no clear record of heating cylinder temperature control, plasticizing time, molded products cannot be completely resolved, silver streaks of molded products, discoloration and foreign matter adhesion, etc. problems, to reduce adverse effects
Active Publication Date: 2009-05-13
JAPAN STEEL WORKS LTD
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Problems solved by technology
However, at these vacuum levels, there is a problem that components such as gas and moisture generated from the molding material cannot be sufficiently removed from the heating cylinder.
And, as a result, molded products cannot completely solve the problems of silver streaks, discoloration of molded products, and foreign matter adhesion to molds mentioned above.
In addition, in Patent Document 1 to Patent Document 4, the molding conditions such as temperature control of the heating cylinder, plasticizing time, and back pressure are not clearly described, and the above-mentioned molding conditions cannot be set to optimal values except for the degree of vacuum. Efficient removal of exhaust gases such as gases cannot be performed
Method used
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[0041] The injection molding method of this embodiment and the injection molding apparatus used for this method are demonstrated with reference to FIG.1, FIG.2. FIG. 1 is a cross-sectional view of an injection molding apparatus when a screw rotates forward in a plasticizing step. 2 is a cross-sectional view showing the state of the heating cylinder and the screw when the screw is reversed in the plasticizing step.
[0042] The injection device 1 includes a heating cylinder 3 to which a nozzle 2 having a nozzle hole 2 a is fixed at a front end and a casing 8 is fixed to a rear end. The heating cylinder 3 is a cylindrical member with a predetermined thickness to withstand the pressure of the molten resin 28, and is divided into a front area H3 adjacent to the screw head area H2 and a middle area in addition to the nozzle area H1 and the screw head area H2. H4, each area of the rear area H5 closest to the housing 8. In addition, heaters 32 and thermocouples 33 are respectivel...
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The objective of the invention is to provide an injection forming method which can fully remove exhaust gas such as gas and moisture from forming materials in a heating drum when the forming materials are injected to a mold cavity as a fusion state in a vacuum heating drum. In the injection forming method that enables the forming materials (27) to form a fusion state and be injected to the mold (6) cavity (6a) in vacuum heating drum, a shaft part (5b) of a screw (5) is sealed, the vacuum degree in a forming material supplying path can be reduced below 6.33kPa by a vacuum pump (41) in the sealed heating drum, and the forming materials are supplied as a hunger state mode in the heating drum and the content produced from the fused forming materials is attracted.
Description
technical field [0001] The present invention relates to an injection molding method in which a molding material is brought into a molten state in a heating cylinder in a vacuum state and injected into a cavity of a mold. Background technique [0002] In an injection molding method in which a molding material is melted in a heating cylinder and injected into a cavity of a mold, components such as gas and moisture are generated in the heating cylinder as the molding material melts. In addition, as a result of these components being injected into the cavity of the mold together with the molten material, silver streaks occur on the surface of the molded product, discoloration of the molded product occurs, and foreign matter formed of gas components adheres to the cavity surface of the mold. . As techniques for solving the above-mentioned problems, the injection molding methods described in Patent Document 1 to Patent Document 4 are known in which a molding material is brought i...
Claims
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Inventor 阿南一也
Owner JAPAN STEEL WORKS LTD