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    • 2. 发明授权
    • Process for compression-forming of thermoplastic objects
    • US10105881B2
    • 2018-10-23
    • US14391657
    • 2013-04-25
    • C.G.M. S.P.A.
    • Corrado Saverio Parmigiani
    • B29C43/00B29C43/52B29C43/10B29C43/36B29K23/00B29K25/00B29K27/06B29K55/02B29K59/00B29K67/00B29K69/00B29K77/00B29K105/00
    • The process includes a die comprising a bottom die (10) and a male part (20) able to close the cavity in such a way as to define a closed forming chamber (F). The bottom die (10) has an upper mouth that delimits the cavity (15), having an open upper surface substantially open in an upwards direction and a lateral surface internal of the cavity of the bottom die and forming an angle with the upper surface. The male part (20) has a central portion (21) able to close the surface of the cavity (15) and a peripheral edge able to adhere to the upper surface of the upper mouth, such as to realize a closing of the forming chamber only by means of contact along the upper surface, the peripheral edge lacking a vertical surface able to slide snugly contactingly with the lateral surface of the upper mouth (11). The process comprises: inserting a batch of non-spongy/foam thermoplastic material having a greater density than 0.9 Kg/dm3, in the solid state and in small pieces, into the cavity of the female component, supplying heat to the parts of the die, up to producing at least a partial melting of the batch located in the cavity of the die, nearing the two parts of the die to one another, by action of a thrust able to deform the batch in the at least partially molten state, the movement leading to a reduction of a distance between the upper mouth and the peripheral edge up to reciprocal contact thereof.