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Two-color molding and design requirements outlined

Two-color molding and design requirements outlined
Color mode: two on the same plastic material injection molding machine, molding twice, but the product only once a die mold. In general this is also called double injection molding process, usually done by a set of molds, and the need for specialized color injection molding machine.

Overmold: Two plastic materials are not necessarily on the same injection molding machine, a two molding; the product is removed from the mold after a mold, then put another set of mold for a second injection molding. Therefore, the general molding process which is usually done by the two sets of molds, without the need for a special two-color injection molding machine.

Two-color mode has been popular on the market, and because this process can make more beautiful appearance of the product, easy to change color and you can not spray, certainly will be the market trend. But it is still in its infancy in the affluent for two-color injection molding machine also has only "ENGEL 150T", "ENGEL 120T" and several models. Faced with pressure from market competition, we must face engaged! Now the problem is currently based on two-color mode in the design and production experience, I sum up the experience, summed up in the post, I hope to follow in the future design work. Deficiencies of the Department, according to the "new model design considerations."
1. Cavity two shapes are different, each forming one kind of product. The two shapes Core exactly the same.
2, before the mold, after the mold in the center of rotation of 180º, must match. This action must be done to check the design.
3, note the position of the top stick hole, minimum distance 210mm. Large mold shall be appropriate to increase the number of top clubs holes. Moreover, since the injection molding machine itself, the top stick that comes with not long enough, so we need to design the mold top stick longer, grow top mold base plate stick around 150mm. It must be designed two locating ring mold base plate on the rear.
4, the total thickness of the front panel analog A board plus not less than 170mm. Please look carefully at this type of injection molding machines other reference data, for example, the maximum capacity of the mold thickness, the minimum thickness tolerance mode, the top rod hole distance. (Refer TDG51036)
5, three-plate mold outlet preferably designed to automatically release action. With particular attention to the release of soft nozzle action is reliable.
6, the depth of the front side SPRUE not exceed 65mm. Upper side (big outlet) top SPRUE distance from the center of the mold base to not less than 150mm.
7, in the design of the second injection CAVITY, in order to avoid CAVITY plug (or rub) injury has been forming a good product first plastic bits, you can avoid the empty part of the design. However, the intensity must be carefully considered every bit of sealant, namely: in injection molding, if there will be at high injection pressure, plastic deformation, resulting in a second injection may be approved front possible?
8, injection molding, injection molding products for the first time can be slightly larger size to make it in the second molding presses with another CAVITY tighter in order to achieve the role of sealant.
9, pay attention to in the second injection, the plastic flow of whether the first impulse has been forming a good product to plastic bit deformed? If there is a possibility, we must find ways to improve.
10, in front of A, B plate clamping, pay attention to whether or front mold Slider Lifter will be reset and the crushed product? So, we must find ways to make the A, B board first mold, die SLIDER before or after LIFET be reset. (Refer TDG51284, TDG51285, TDG51287)
11, two CORE CAVITY and layout of carrying water as fully as possible, and balanced, the same.
12.99% of the cases are injection molded hard plastic part of the product first, and then injection molded soft part of the product. Because the soft deformation.
13, in order to make the two plastic "stick" to get closer, to consider the roughness of the "sticky" and the material between the mold surface. Color injection molding has a special TPU; while the smooth surface of the mold, they "stick" more tightly.
14, note the positioning of the front and rear module; all inserted through, by breaking the surface of the slope of the gap as large as possible, to be 0.1mm or more.

Color mode design requirements
Color mode: two on the same plastic material injection molding machine, molding twice, but the product only once a die mold. In general this is also called double injection molding process, usually done by a set of molds, and the need for specialized color injection molding machine.

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