Foaming parts with the most perfect surface

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; It is necessary to use a double circuit mold warming machine to heat and cool the mold. The meeting reviewed and approved the articles of association of civil aircraft materials industry development alliance

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. This foaming part with black ABS has a high surface gloss, without any bubbles and obvious parting lines. 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 cross section of kimw bottle opener made of black ABS

this set of equipment shown in fakuma 2008 is the result of the successful cooperation between kunststoffins and silt fixed titut L ü denscheid and Wittmann group. Kunststoffinstitut L ü D used recycled plastic for 3D printing objects enscheid developed the electric induction mold heating technology, which has entered the stage of commercial application 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

in production, a Wittmann manipulator of Wei's revised "titanium dioxide industry access conditions" is responsible for putting metal inserts into the mold and taking the formed bottle opener out of the mold. Based on extensive experience in structural foaming technology, Wittmann Battenfeld optimized its HM 110/210 injection molding machine to make it suitable for structural foaming production. It is reported that chemical foaming agent is used in this production. In addition, other accessories in this set of production equipment are also from Wittmann group. (end)