Nowadays, the styles of consumer products are ever-changing, and they must be beautiful in appearance and exquisite in design, and they must quickly meet market demand. Designers generally use different materials in different parts of the consumer product for different purposes to meet the needs of specific environments, to extend product life, increase aesthetics and practicality. This practical design requirement will undoubtedly lead to complicated production technology, and the double material injection molding process is born in response to this trend. The general two-material product can be manufactured by a single-color injection molding machine. Basically, one injection molding machine can be used, but the post-processing process is quite time-consuming and complicated, directly affecting the quality of the product, and the total production cost is not economical. In addition to the corresponding changes in the injection molding machine, the mold design process is the soul of the whole technology. The mold is rotated and displaced to achieve the effect of simultaneous injection of different materials.

    The mold design is roughly divided into two categories: the first type has two mold cavities, and the semi-molded module is transferred 180 degrees into the other mold cavity by the rotation mode, and the advantage is that the first and second processes can be simultaneously performed; One type is a single cavity, and the semi-finished product is rotated 180 degrees with the mold. The design is relatively simple, but the production efficiency is correspondingly reduced. Since the mold or semi-finished product needs to be rotated, the mold design and the requirements of the injection molding machine are more precise. In addition, due to the high variability of double-material injection molding, it is necessary to achieve smooth production and meet the expected ideals. All mold design must be considered in parallel with product design, and the specifications of the popular double-material injection molding machine are not uniform, resulting in mold design. More questions to consider; plus less versatility, moldmakers must pay more attention. Double material products are generally made of hard plastics such as ABS and PC, and TPE soft plastics. They are suitable for making tableware, tool handles, case, telephone casing and buttons. This makes the production company must pay attention to three points in technology: the fusion of the two types of materials, the complexity of the product and the adjustment of the injection molding machine. For example, due to cost or application, there may be no good adhesion between the materials used, and double material injection usually requires more debugging work in this area. More two-color injection molding problem Elite injection molding will continue to pay attention.

    The two-shot molding mainly produces two-shot products by two moldings of two-shot molding machine and two sets of molds in two steps.

    Compared with the traditional injection molding, the two-shot co-injection molding process has the following advantages:

   █ core material can use low viscosity materials to reduce the injection pressure.

   █ From the perspective of environmental protection, the core material can use recycled secondary materials.

   █According to different use characteristics, such as thick material finished skin material using soft material, core material using hard material or core material can use foam plastic to reduce weight.

   █ can use lower quality core materials to reduce costs.

   █ The skin material or core material can be expensive and has special surface properties such as electromagnetic wave interference resistance and high electrical conductivity to increase product performance.

   █ Proper cortex and core material can reduce the residual stress of the molded product, increase the mechanical strength or the surface properties of the product.

   █ produces products such as marbled roads.

    From the characteristics and application of multi-color injection molding and double-material co-injection molding, it can be seen that there is a tendency to gradually replace the traditional injection molding process in the future. Innovative injection molding technology not only improves the precision of the injection molding process, provides highly difficult process technology, but also opens up the scope of the injection molding process. Innovative injection equipment and processes are sufficient to meet the increasingly diverse, high-quality, high value-added product needs

http://www.junshengmold.com/industry-news.html