Blog Information

• Posted By : mold shine
• Posted On : Jul 08, 2021
• Views : 174
• Category : Technology
• Description : Bi-Color Mould is a mold in which two plastic materials are molded twice on the same injection molding machine.

Overview

• 　　Bi-Color Mould is a mold in which two plastic materials are molded twice on the same injection molding machine. Bi-Color Mould usually consists of two sets of molds. The back mold must be rotated 180 degrees, while the front mold does not move, but the product is ejected only once. Generally, this kind of molding process is also called two-color injection molding, which requires a dedicated two-color injection molding machine.

  　　The selection of Bi-Color Mould material is a very important link in the entire Bi-Color Mould processing process, but the design of the two-color mold is also very important, which plays a decisive role in ensuring the normal production of two-color injection molding. The bucket mold reduces failure and quality. Problems, and extend the service life of the mold. Compared with ordinary single-color molds, what are the more complicated details in the design of Bi-Color Mould?

  　　1. The water delivery arrangement of the two cavities and the core is as sufficient as possible and balanced.

  　　2. The guide post and guide sleeve of the mold base must be symmetrical up and down, and the front and back molds must be symmetrical.

  　　3. After the front mold of the mold rotates 180o from the center, it must be matched with the back mold. This is something that must be paid attention to when designing.

  　　4. The product spacing must be based on the nozzle spacing of the injection molding machine. The nozzle spacing of foreign two-color injection molding machines is adjustable, some are not, and the domestic ones are not.

  　　5. Two independent ejector systems and two ejector rods. The two products of the back mold are the same, and the thimble is also the same. It is a rotation relationship and cannot be made into a translation relationship.

  　　6. In 99% of the cases, inject the hard rubber part of the injection product first, and then inject the soft rubber part of the injection product. Because soft glue is easy to deform.

  　　7. The side locks must be on the four sides of the mold center, and the front and rear molds are symmetrical. Otherwise, when the back mold rotates 180 degrees, it will not align with the front mold, which is not good.

  　　8. If the distance between the injection point and the nozzle of the injection molding machine is different, the ejector pinhole should be waist-shaped, because the ejector pin spacing of the injection molding machine is not adjustable. Note: Most of the injection nozzles of domestic two-component injection molding machines are not adjustable.

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