A. Two color mold: two kinds of plastic raw materials are injected into the same injection molding machine in two times, but the products are only produced once. Usually this kind of molding process is also called double material injection molding. It is usually completed by a set of molds, and special two-color injection molding machine is required. Weixun two-color mold B. rubber covered mold (secondary molding): two kinds of plastic raw materials are not sure to be injected on the same injection molding machine, which are divided into two times of molding; the products are taken out of one set of mold, and then put into another set of mold for the second injection molding. Therefore, usually this kind of molding process is usually completed by two sets of molds, without the need for special two-color injection molding machine. Overview of two-color mold and rubber covered mold: in the design of rubber covered mold, attention should be paid to the positioning of hard rubber parts. It is necessary to achieve * sealing and have anti slope holes on the rubber parts, so as to prevent rubber deformation. At present, the two-color mold is increasingly popular in the market. In this process, it is better to make the appearance of the product more beautiful, easy to change color and not spray, but the cost is high and the technical requirements are high
1. The two forms of cavity are different. Farewell forms a product. The two forms of core are exactly the same. 2. After the front and back dies of the die rotate 180 o in the center, they must be consistent. Make sure to do this test when designing. 3. Pay attention to the position of the top pinhole with a minimum interval of 210mm. For large moulds, the number of holes in the ejector pin shall be increased appropriately. Moreover, since the ejector attached to the injection molding machine itself can not be long, we must design a long ejector in our mold, and the ejector will grow 150 mm out of the mold base plate for control. Two locating rings must be designed on the back mold bottom plate. 4. The total thickness of front formwork panel plus a plate shall not be less than 170mm. Please carefully check other reference data of this type of injection molding machine, such as the maximum mold thickness, the minimum mold thickness, the spacing of the top stick hole, etc. 5. It is better to design the nozzle of the three plate mold as the automatic demoulding behavior. Special attention should be paid to the demoulding behavior of the soft rubber nozzle. 6. The depth of sprue at the front side shall not exceed 65mm. The distance between the top of sprue on the upper side (large water port) and the center of mold embryo shall not be less than 150 mm. 7. In the design of the second injection molding of the cavity, in order to prevent the insertion (or rubbing) of the cavity from damaging the product glue position which is still well formed for the first time, it is advisable to design a part of the cavity avoidance. However, we must carefully study the strength of each sealing position, i.e. in injection molding, is there any possibility of plastic deformation under large injection pressure, resulting in the possibility of batch front in the second injection molding? 8. During injection molding, the product size of the first injection molding may be slightly larger, so that it can be pressed more tightly with another cavity during the second molding to achieve the sealing effect. 9. Pay attention to whether the flow of plastic in the second injection will impulse the products still forming for the first time and make their glue position deformed? If this is possible, we must think of ways to improve. 10. Before closing the A and B plates, pay attention to whether the front mold slider or lifter will reset first and crush the product? In this way, we must find a way to close the die on board a and B first, and then the slider or life of the front die can be reset. 11. although the water transportation deployment of the two CAVITY and CORE is sufficient, they are balanced and the same. In 12.99% of cases, the hard part of the product is injected first, and then the soft part of the product is injected. Because soft rubber is easy to deform.
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