| 摘要 |
<p>Disclosed are a blow molding method and machine for forming from a continous tube of substantially unoriented normally highly crystalline thermoplastic material at its orientation temperature a chain of hollow, shaped article bodies in which the material is biaxially oriented. The machine comprises a tube and chain transporter, a tube brake, and at least one stationary blow mold. The transporter functions to pull the tube from a first point to a second point, and to push beyond the second point that portion of the chain formed between the two points. The tube brake functions to brake the travel of the tube past the first point during at least part of the time it is being pulled, whereby the part of the tube between said points is longitudinally stretched. The stationary blow mold has at least two mold pieces that close on the stretched part of the tube, and open after formation of the hollow body in the cavity defined by the closed mold pieces. The mold also comprises means for inflating the portion of the stretched part of the tube within the mold cavity, whereby one of said bodies is formed therein, and the material thereof becomes biaxially oriented.</p> |
