2. Key points of mold design for two color mold:

A. The two materials of the two-color plastic part must have good mutual fusion. Hard plastic and soft plastic have a structure that can be well combined. The hard plastic is partially made into rough lines or the connection buckles that facilitate the attachment of the soft plastic material, etc. In order to make the two plastics materials stick more tightly, the stickiness between the materials and the roughness of the mold surface should be considered.

B. As far as possible, the soft plastic material can be fed from the front cavity, so that the soft plastic material of the cavity and core molds can be connected together. The connection part should be able to ensure the effective flow of the soft plastic material. Do not make the connection part too thick to save soft TPE material.

C. The mold design should ensure that the injection molding can have a high quality. Because of any defective products, it is more difficult to separate and recycle the two plastics materials.

D. When designing the mold, first distinguish which two-color injection machine the customer uses. Master first-hand information on injection molding machines. Two-color injection molding machines in Japan, China and Taiwanarea all have two sets of parallel injection systems. Most of the two-color molds in Europe are based on ARBURG injection molding machines. One injection system is horizontal and the other is vertical. This set of molds introduces Asian two-color molds.

 E. When designing the mold, it is necessary to inject the hard plastic material (here in this part is ABS) in the first injection, and soft plastic material is generally placed in the second injection. Because the soft plastic material is easily deformed. The mold is designed so that the second soft plastic material can cover the first hard plastic material entry point as much as possible. In order to facilitate the precise mold closing after the turntable is rotated, the first nozzle material should be taken out in time, most of which are taken out by Robot jig or manually. The nozzle of the three-plate mold should preferably be designed to automatically release the mold. Special attention should be paid to whether the release action of the soft plastic material nozzle is reliable.

F. The two mold bases of Asian two-color are exactly the same. When ordering mold bases, you need to pay attention to the machining accuracy, which is convenient for exchange and clamping. G. The shapes of the two cavities are different, and one product is molded respectively. Then the two shapes of the core are exactly the same. Since the core has a soft plastic material position, when the soft plastic material is injected, the ejector plate retreats, leaving a space for the soft plastic material to enter the plastic. When injection molding ABS, the long guide post is used to bounce the thimble plate through the seesaw.

H. After the cavity and core molds of the mold are rotated 180º from the center, they must be matched. During the design, the mold rotation action must be checked.

I. When designing the CAVITY for the second injection, in order to prevent the CAVITY from inserting (or scratching) the material position of the product that has been molded for the first time, a part of the void can be designed. However, the strength of each sealing position must be carefully considered, that is, in the injection molding, is there a possibility that the plastic will be deformed under a large injection pressure, which may lead to the possibility of a sharp edge in the second injection molding?

J. During injection molding, the product size of the first injection molding can be slightly larger, so that it can be pressed more tightly with another CAVITY during the second molding to achieve the effect of sealing.

K. Note that during the second injection, will the flow of the plastic impel the first molded product to deform its plastic position? If this is possible, there must be a way to improve it.

L. Before the A and B plates are closed, pay attention to whether the cavity Slider or Lifter will reset and crush the product? In this way, we must find a way to make the A and B plates to close the mold first, and then the SLIDER or LIFET of the cavity can be reset.

M. The water transport arrangement of the two CAVITY and CORE should be as sufficient as possible, and should be balanced and the same. All the water-carrying joints come out from the side and connect to the water-carrying seat in the middle of the code formwork.

N. Pay attention to the positioning of the cavity and core molds; the inclination drop of all insertion and breaking surfaces should be as large as possible, and should be more than 0.1mm

Note: Our factory Dongguan Cents Industrial Co.,Ltd is very professional in making all kinds of plastic injection molds. We provide detailed design constructure and not ignore any small thing. This is why so many customers like to work with our factory. Till now, we make around 100sets molds for customers from Europe, USA, Japan, Iran, Brazil...

  Our factory has been certified by ISO association adn NAQ16949 for Auto parts
  

Cents is a factory with 20 years of experience in mold making and injection molding. Currently, the company and its factory covers an area of 13,000 square meters and has around 200 workers. Among them, 26 are design engineers and structural engineers. We have a complete mold production workshop, injection workshop, dust-free injection workshop, inspection room, warehouse, and assembly workshop. We have advanced EDM and WEDM mold production equipment imported from Japan. We have 46 injection molding machines, 19 of which are Japanese Sodick brand, in order to produce high-precision plastic products. Our products are widely used in the new energy automobile industry, medical industry, mechanical and machinery industry, home appliance industry and beauty industry. Among them, we are very professional and have rich experience in the production of negative pressure cups, tapping thread products and transparent acrylic products.
In 2019, we started to carry out the IMD/IML process and established an IMD/IML product production workshop, specifically for some customers who have very high requirements for product appearance and process.
Our factory has always adopted ISO 9001 as its operating principle. In terms of auto parts products, we have been certified by the 16949 organization and issued a 16949 certificate.
Our company only focuses on ODM/OEM design and production. Therefore, to provide customers with the best quality design, production and service is our company's core value requirements;

  ***More than 40 sets injection machines;
  ***More than 20 engineers and 200 workers;
  ***One-stop service in making mold and molding;
  ***Anti-dust workshop for IMD/IML molded parts;
  ***Assembly line available for some finished parts;
  ***Most advanced equipment for EDM & WEDM, Sodick brand injection machine