Foaming parts with the hottest perfect surface 0

2022-10-12
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Foamed parts with perfect surface

generally, structural foamed parts are favored by people because of their bubble free, low warpage and lighter weight than injection molded parts. However, most structural foaming components have typical characteristics such as rough and unsmooth surface and stripe defects. Whether chemical foaming or physical foaming is used, these defects are difficult to avoid. Therefore, structural foaming parts are mainly used in applications that require good mechanical properties, low dimensional accuracy and low tension. Such applications generally have low requirements for surface quality

now, with the introduction of a new structural foaming process, it is possible to produce structural foaming parts with high surface quality. This process can bring a smoother surface for components, even better than those with dense internal injection parts. Of course, its production cycle is slightly longer than the traditional structural foaming process. The main features of the process include: the need to use foaming agent in the injection melt; It is necessary to conduct induction heating on the mold regularly; A double circuit mold warming machine is needed to heat and cool the mold circularly

Figure 1 kimw bottle opener is a structural foaming part with a high gloss surface

in fakuma 2008 exhibition, Wittmann Battenfeld first demonstrated the process of injecting bottle opener with this technology. Therefore, there must be corresponding mechanical property indicators to characterize that this foaming part with black ABS has a high surface gloss, and there is neither any bubble nor obvious parting line. In order to prove the technical advantages of this process, only the front side of the component is heated and cooled circularly in production. Because its back is not heated, it shows typical characteristics similar to the surface of foam parts with traditional structure

an important advantage of this new process is that by injecting the melt into the hot cavity, not only the surface shape completely consistent with the contour of the cavity is obtained, but also the surface density is very high. This makes the parts more beautiful and has higher mechanical strength. The perfect and uniform core foaming structure prevents the generation of bubbles and warpage

Figure 2 section of kimw bottle opener made of black ABS

the servo valves adopted in fakuma are imported servo valves, and the oil pump adopts internal gear pump imported from Italy. This set of equipment shown in 2008 is the result of the successful cooperation between kunststoffinstitute L ü denscheid and Wittmann group. Kunststoffinstitute L ü can exhaust the air in the main cylinder. Denscheid has developed the electric induction mold heating technology, which has entered the commercial application stage at present. Through the use of this bottle opener mold, this technology is used in the production of structural foaming parts for the first time. In this process, Wittmann uses innovative mold temperature control technology. By using two different circulating water temperatures, the effect of rapid heating and efficient cooling can be achieved

Figure 3 rear view of kimw bottle opener: typical surface of foaming parts with traditional structure

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