английский => русский Техника Техника (в целом) Формование

[01] A helmet shell was molded using a matched metal die mold, designed to mold medium-sized ACH helmet shaped parts at 7.87 mm (0.310 in) wall thickness. Layers of Spectra Shield® II SR-3124 materials were cut from a 1.6 meter (63 in) wide rolls. A *****pin-wheel pattern***** was utilized. Each pin-wheel pattern was designed in such a manner that it completely covered the male mold. A total of 28 layers of pin-wheel were pre-formed in a bottomless bucket, and, at the same time, mold heating was started. Once the mold reached a temperature of 125±5ºC (257±9ºF) a coat of mold release was applied on the male and female parts of the mold. The pre-formed layers of Spectra Shield® II SR-3124 were then transferred to the mold. Care was taken that there were no folds or creases generated on the pre-form during transferring to the mold. A 190 Ton gauge pressure was applied for 20 minutes. After 20 minutes, the cooling cycle was started. During cooling cycle molding pressure was not removed. Once the mold cooled to about 35C (77ºF), the mold was opened and molded shell was removed.

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