Injection molds with advanced technology are more likely to appear in higher value-added applications, and automotive interior and exterior are one of them. Many advanced technologies, such as sequential valve hot runner control technology, internal split profile technology, and low pressure injection molding technology, have been developed and applied in automotive injection molds.
The sequential valve hot runner control technology (SVG technology) is a new type of controlled hot runner technology. It is processed in sequence by the cylinder control to solve the problem of appearance defects of the traditional multi-point synchronous feed products. It can effectively avoid the defects such as weld lines and cavitation in the interior and exterior parts of the car, reduce the flow length, reduce the molding pressure, and play a huge role in the interior and exterior parts of the car with strict appearance requirements.
The so-called low-pressure double-layer injection mold is a part that is traditionally vacuum-adsorbed by manual coating and male mold, and is directly injection molded in the mold. The main principle is: the plastic injection pressure is lower on the cloth. When the mold is opened, the cloth should be hung on the front mold hanging needle, then the mold is closed, the injection is made, and finally the piece is taken. The products produced by this technology have a special soft fabric on the surface, which is greatly improved in decoration, hand feeling and aesthetics. Therefore, low-pressure injection mold technology is widely used in medium and high-end cars, and is generally applied to parts such as automobile ABC columns.
In automotive injection molds, for automotive bumper products, advanced internal parting technology is often used in mold design. The advantage is that the parting clip line is hidden on the non-appearing surface of the bumper, and the appearance of the clip line is not seen after assembly on the car, and the appearance of the product is not affected. However, this technology is more complicated and structurally difficult than the external type bumper, and the technical risk is also high. The mold cost and mold price will be higher than the external type bumper, but because of the beautiful appearance, it is in the middle and high-end cars is widely used.