Stentering frame

Figure 9-18. Dimensa mercerizing machine cloth run diagram. 1. impregnating zone 2. cooling and reaction zone 3. stenter frame 4. stabilizing zone 5. washing and neutralising zone.

Pin holes Holes along the selvedge caused by pins holding fabric while it processes through stenter frame. It is major, if pin holes extend into body of fabric far enough to be visible in the finished product. 

Biaxially oriented PET and PEN films are exclusively produced by a stenter process where commonly the amorphous cast film is drawn in the machine direction (MD) by passing it over heated rollers and then fed into a stenter frame to achieve a draw in the transverse direction (TD) (see Films, Manufacture Films, Orientation). A schematic of the process is shown in Figure 1. 

The molds not only include the connections and the periphery, but also the electrodes and milling programs. These must be present in order to be able to perform a quick repair in case of damage. It should be specified to the mold supplier how the electrodes are set up, so that a precise position in the mold can be found. Each plastic molded part may include grippers, auxiliary devices such as foil feeding, stentering frames, sprue grippers, vacuum suckers, hot runner nozzles, and gas and water injectors. 

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