Ejection shaping mould set

Abstract

The present invention discloses one kind of jetting formation mold assembly including one male mold and one female mold for producing rectangular plastic part. The male mold has one rectangular male mold cavity and one bent flow channel including one first section and one second section separately near to and parallel to two adjacent lateral sides. The female mold to be fitted with the male cavity has one female mold cavity and several heat running channels for plastic to be poured through and injected into the male mold cavity and the female mold cavity in producing the rectangular plastic part.

Description

technical field [0001] The invention relates to an injection molding die set, in particular to a cooling water circuit design of the injection molding die set. Background technique [0002] First, please refer to FIG. 1 , the backlight module of a general flat panel display mostly includes a rectangular plastic frame P for fixing a light guide plate or other optical components, wherein the plastic frame can be manufactured by injection molding. Then please refer to FIG. 2 , the injection molding die set used to manufacture the plastic frame P mainly includes a male mold 10, a female mold 20, and an injection nozzle 30, wherein plastics can pass through the multiple injection nozzles 30 inside the female mold 20. The hot runner 40 is injected into the forming area 50 to make the aforementioned plastic frame P; as shown in FIG. composition. [0003] Please refer to Fig. 3A and Fig. 3B together. The aforementioned male die cavity 51 is located on the parting surface 101 of th...

AI Technical Summary

Problems solved by technology

However, most of the cooling circulating fluid in these parallel channels 11 can only cool the local position of the male mold cavity 51, which not only easily causes uneven cooling area, but also fails to achieve a good heat exchange effect, and its disadvantages are It takes a long cooling time after injection molding, and the formed product is prone to warping and deformation

[0004] Please also refer to Fig. 4A and Fig. 4B, the aforementioned female mold cavity 52 is located on the parting surface 201 of the female mold 20, and usually only an S-shaped runner 21 is provided inside the traditional female mold 20, and its position corresponds to The aforementioned female mold cavity 52; however, the S-shaped runner 21 not only has the disadvantage of too long a flow path, but also cannot form an effective thermal barrier between the hot runners on the left and right sides 521 of the female mold cavity 52

Since the temperature of the mold surface rises easily due to heat conduction and heat radiation between the different hot runners inside the master mold 20, thereby affecting the quality of the forming, how to design a better cooling water circuit to effectively cool down and prevent the internal temperature of the mold Imbalance becomes an important issue

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