2k plastic injection mold and 2 shots over mold in China . This project is made for our Canada customer
EMS companies in Quebec, low volume but high quality control production with MOQ 1000 pieces per order. The material is PC+TPU. the first injection material is PC with white color. the second injection material is TPU material with black color . Bonding testing performance.
Project details as below :
2 shots over moulding
Core surface finish:
Cavity surface finish:
No of Cavities:
Type of gating:
Lead time for T1:
Mold base steel:
Total Mold Price Totally:
1） 2 shots over mold and plastic molding
2) Hard deformation control
3) No flash are allowed for the outside surface and holes
4) PC bonding with TPU with bonding result testing
Asia Billion Advantages for this project:
1） 20% lower price with your current suppliers
2) excellent customer service and payment terms
3) 1000 pcs MOQ is acceptable for mass production.
Asia Billion 2 shots over mould Process showing:
Asia Billion 2 shots over mold Engineering and Project Capacity:
Mold Workshop Overview:
Packing and Logistics:
The basic principles of 2 shots injection over mold design ( part one)
(1) Hard plastic is done at first, and soft rubber is done second;
(2) 1 time for transparency and 2 times for non-transparency;
(3) The plastic with high molding temperature is made first, and the molding temperature is low second
The above is the basic principle of making a 2 shots over mold, otherwise the mold will be failed; in addition, when do the over mold, try to use the flat surface to seal, instead of any shut-off surface, even if it is recommended that the customer modify the product, it must be use the flatness surface for over molding sealing . if not , the part will have big flash and will fail for the over molding;
1. The guide bush guide bushing must be symmetrical up and down, left and right symmetrical.
2. The back mold should be rotated 180 degrees, and the front mold does not move.
3 The product spacing must be based on the spacing of the injection molding machine's gun nozzle. The nozzle spacing of some foreign two-color injection molding machines is adjustable, some are not adjustable, and the domestic is not adjustable.
4. Two separate ejector systems, two top sticks. The two products of the rear die are the same, the thimbles are the same, and the rotation relationship is not made into a translational relationship.
5. The ejector plate can only be reset with a spring. It is not possible to force the reset by the screw because the rear die is to be rotated.
6. The side lock must be on the four sides of the center of the mold, and the front and rear molds are symmetrical. Otherwise, when the rear mold is rotated 180, it will not be aligned with the front mold.
7. If the distance between the glue points and the distance between the nozzles of the injection molding machine are different, the top stick holes should be made into a waist type because the spacing of the top pins of the injection molding machine is not adjustable. Note that most of the injection nozzles of domestic two-color injection molding machines are not adjustable.
8. Pay attention to the direction of the parallel nozzle of the injection molding machine provided by the customer. It is the x-axis or the y-axis to determine the layout of the product.
9. The direction of water in and out of the water must be on the side of the heaven and earth, and the inflow and out of each circulating water must be on the same surface. The water should not be in the sky, and the water should be on the ground side. Because the back mold should be rotated 180 degrees, pay attention to the mold. The size should not exceed the height of the water tank of the injection molding machine, otherwise the water cannot be transported.
10. The first injection of the product should be placed on the non-operating side, because the first injection of the product should be rotated 180 degrees for the second injection, just to the operating side, easy to take the product.
11. The pattern position of the exit die should be on the operating side and the non-operating side, not on the heaven and earth side, because their products should be fully automatic.
12. Note on the parting surface: the parting surface of the rear mold parting surface should be the back part after the combination of the two products; the front part parting surface should be taken from a single product, and the combined product is not available. Parting surface.
13. The tolerance of the front and rear flanges is minus 0.05mm, the tolerance of the two flanges is plus or minus 0.02mm, the gap between the top and the top of the top stick is 0.1mm, and the center tolerance of the guide bushes of the front and rear die guide sleeves is positive or negative. 0.01, the tolerance of the four sides and the depth of the mold frame. Otherwise, when the rear mold rotates 180 degrees, the front end is generated due to the inconsistency of the height. The frame depth tolerance is minus 0.02 mm.
14. If the mold base has been processed in the mold factory, the factory should process the nozzle and the top hole, and take the number of the center of the guide hole of the four guide pillars as the reference. Otherwise, the deviation is too much and the card is easy to be used. Die die. When ordering the mold embryo, it is necessary to indicate that it is a two-color mold base. The four guide pillar guide sleeves and the frame are symmetrical, and the rear mold can be matched with the front mold after being rotated by 180 degrees.
15. If it is the two-color rotation of the rear mold, it is much simpler. The two front cores are the same. After the hard rubber is injected, rotate 180 degrees (note that the product can not be dropped when the product is turned, the gate can be automatically separated). After the other side, the soft rubber is injected. The injection of the hard rubber does not need to be placed on the thimble. It only needs to be placed on the soft rubber core. In addition, the shrinkage should be noted. If the soft rubber is completely entangled with hard rubber, only the hard rubber should be placed. Shrinkage, if the contours are connected, the hard rubber softener should be shrunk.
Asia Billion are the expert for the 2 shots over mold and plastic molding project, we have more than 40 sets 2 shots over mould which are made each year. let us know freely if you have any new over mold or 2 shot mould and molding project.