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Annealing

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3.2  Shrinkage

(3) Annealing

Whether or not annealing is necessary to stabilize the dimensions of a part depends on the conditions under which it is to be used. Estimates based on after-shrinkage data(Fig. 3-15 and 3-16) will be helpful.

A high operation temperature requires a fairly high annealing temperature. For example, with very slight after-shrinkage, you may find that annealing at 175°C for 3 hours or at 190°C for one hour is necessary as seen in Figs. 3-21 and 3-22.

Figure 3-21Figure 3-22

 

   >>> [ Flowability ] [ Mold Shrinkage ] [ After-shrinkage ] [ Annealing ] [ Dimensional changes ]
Contents Introduction Molding
Conditions		 Moldability Molded Product
Quality		 Mold
Design		 Safety Countermeasures