Understanding the Principles of Two-Color Injection Molding
2025,12,09
The principles of two-color injection molding are as follows:
1. The front mold has two different shapes, each molding one type of product, while the rear mold has two identical shapes.
2. The sprue of the three-plate mold is designed for automatic demolding, making the process more convenient. Special attention should be paid to the reliability of the demolding action of the soft-plastic sprue.
3. The front and rear molds rotate 180 degrees around their center, ensuring they align perfectly. This check must be performed during operation, as it requires precise platen positioning. The total thickness of the front platen plus the A-plate should not be less than 170 mm. This should be carefully checked against the injection molding machine model and other reference data.
4. When designing the second injection molding master mold, a clearance element can be designed to prevent the secondary mold from scratching the glue area of the first molded product. However, the strength of each sealant must be carefully considered, i.e., whether the plastic will deform under high injection pressure during injection, which could lead to flash during the second injection molding process.
5. During injection molding, the size of the first molded product can be slightly larger, as it can be tightly pressed against the other male mold in the second molding to achieve a sealing function. Pay attention to whether the plastic flow during the second injection impacts the first molded product, and whether the plastic deforms. If possible, we must find ways to improve this.
6. Before the A and B plates are closed, pay attention to whether the front mold slider or tilting top will reset first and crush the product. Therefore, we must find a way to make the A and B plates clamp first, followed by the front mold slider or tilting top resetting. The water delivery arrangement of both front and rear molds should be as sufficient as possible, and the balance should be the same.
HUIWEN Professional Injection Plastic Parts,like Household appliances plastic parts, Automotive Plastic parts, agricultural tools plastic parts, medical equipment plastic parts, toys plastic parts, food bottles, boxes, buckets and so on.
