Archive image from page 53 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 hydraulic press. After 3 minutes, the male die was raised while the application of vacuum continued. When the temperature of the formed acrylic plastic decreased to 160°F after about 12 minutes, the acrylic plastic was removed from the female mold and cooled on a workbench. Although the supplier of acrylic plastic plate recommended heating the acrylic plastic to 340°F and the dies to 170°F prior to forming, so
Archive image from page 53 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 hydraulic press. After 3 minutes, the male die was raised while the application of vacuum continued. When the temperature of the formed acrylic plastic decreased to 160°F after about 12 minutes, the acrylic plastic was removed from the female mold and cooled on a workbench. Although the supplier of acrylic plastic plate recommended heating the acrylic plastic to 340°F and the dies to 170°F prior to forming, some exploratory experiments were conducted to verify those settings. Experi- mentation indicated that although the magnitude of residual stresses in acrylic plastic after forming is inversely proportional to the temperature of the molds and of the acrylic plastic, the number and sizes of surface blisters and pits is directly proportional to the magnitude of those two temperatures. By varying the temperature of the acrylic plastic and of the dies, it was found that if the acrylic plastic was preheated to 310 to 320°F and subsequently placed into 160°F dies, the number and severity of surface blisters was not noticeable, while at the same time the residual stresses were not too excessive. Lowering the temperature of acrylic plastic to 260°F eliminated all surface bubbles and blisters, but introduced stresses of unacceptable magnitude. Figure 24. Hydraulic press with matched male and female die assembly for pressing spherical sectors for model capsules. 50
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Photo credit: © Actep Burstov / Alamy / Afripics
License: Licensed
Model Released: No
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