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There is no essential difference between automotive interior and exterior injection molds and other injection molds, but they also have many characteristics of their own. Since the added value of automotive injection molds is generally high, many advanced technologies (such as sequential valve hot runner control technology, internal parting surface technology, low-pressure injection molding technology, etc.) are preferentially developed and applied in automotive injection molds.
1. Sequence valve hot runner control technology (SVG technology)
Sequence valve hot runner control technology (SVG technology) is a new type of step-controlled hot runner technology, which solves the problem of appearance defects in traditional multi-point synchronous glue feeding products through the control of oil cylinders to feed glue in sequence. It can effectively avoid defects such as welding marks and air pockets in the interior and exterior of the automobile, reduce the flow length and reduce the molding pressure, and play a great role in the interior and exterior of the automobile with strict appearance requirements.
2. Low pressure double layer injection mold technology
The so-called low-pressure double-layer injection mold, also referred to as low-pressure injection mold, is a new type of injection mold technology. The main principle of the low-pressure injection mold is: the plastic with low injection pressure flows on the cloth. When the mold is opened, the cloth should be hung on the front mold hanging needle, and then the mold is closed, injected, and finally taken out. The products produced by this technology have a layer of special soft fabric on the surface, which greatly improves the decoration, feel and aesthetics. Therefore, low-pressure injection mold technology is widely used in medium and high-end automobiles, generally used in automobile map bag skeleton, automobile ABC column and other parts.
