Products without Undercuts

Products without undercuts. The relatively easy open-close molds are used. 

The modification of the transmission of a mask allows for the production of three-dimensional structures in glass samples without undercuts. Some... 

The best photostructuring technology for the fabrication of complicated and complex structures is the modified mask method. This process enables the production of three dimensional geometrical structures (without undercut) in single processing step. Unfortunately the masks are very expensive. The produced devices are suitable for many microtechnology applications. 

The product designer should understand that there are many different methods used to free seemingly trapped undercuts so that the product can be ejected. The following two examples illustrate what is involved to mold sudi shapes, and that such solutions are possible but more expensive than designs without such features. 

Production blow molds are always made from several parts. Figure 1.150 illustrates a typical blow mold for a packaging product. Movable mold sections can also be used to relieve deep undercuts or to compress specific areas of the product (i.e., to create articles without weld lines). Figure 1.151 shows a blow mold for a fuel tank, with various side cores to compress some areas and to release undercuts in the product for ejection. Materials used for extrusion blow molds ... 

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