• How to fix flow mark on automotive Dashboard

    More and more  large size of  plastic injection molding parts are used in automotive industry. For consideration of cost, the application of spray free injection parts is more and more extensive. However, this also requires higher cosmetic quality of injection molding parts. On some large parts such as bumpers, dashboards, door panels and long interior plastic accessories, it is very common to see an appearance defect characterized by a streak or stripes perpendicular to the plastic flow direction, which looks like a pattern on the skin of a tiger. We call this “Tiger Flow Line”, for more information on the flow line, please                                                              Tiger flow line   Below is an example to demonstrate how HSMold solve this kind of issues. Product name Dashboard Material PP Color black Mold Tem….

    Injection molding process October 23, 2019
  • How to fix Tiger flow line on the automotive plastic part

    The amount of plastic used in automobile has become an important symbol to measure the level of automobile design and manufacturing technology. At present, more than 10% of the domestic automotive parts are made from plastic including exterior trims such as bumper, skirts and fenders, and exterior trims such as instrument panels, panels and pillars, also engine peripheral parts such as GOP, covers and inlet manifolds. Most of the plastic automotive parts are injection molded because the process has unbeatable advantages such as short molding lead time, high production efficiency and low manufacturing cost is low. However, the coin always have two sides. There are also some plastic defects such as Tiger Line that we could not overlook What is Tiger Flow Line then? Tiger lines are streaks, or wave lines –  look like patterns on tiger skin, with stripes about perpendicular to the direction of melt flow,which is a kind of flow mark.  It usually shows up on automotive…

    Injection molding process October 19, 2019
  • How to fix flow mark on cosmetic medical plastics?

    In the process of plastic injection molding, it is common to see flow mark on plastic parts. Flow marks are lined patterns, often wavy, or discoloration on a part surface. For cosmetic medical plastics, the look is usually very critical and flow mark is a defect that must be eliminated. Cause of flow mark Flow mark defect could be traced to one of three sources,  the resin or dditives used, the injection molding process, or the mold itself. Resin Resin manufacturers supply specific formulations in a range of standard flow rates. Thin-walled products may require an easy flow material while thick-walled products can use a material that has a stiffer consistency. It is better to use the stiffest flow possible because it improves physical properties of the molded part. However, the stiff material will require higher injection pressures, which may blow the mold open and cause flash at the parting…

    Injection molding process September 12, 2019
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