|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||428/188 ; 264/572 ; 264/574 ; 428/36|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 30 인용 특허 : 3|
A process is disclosed for the production of molded tubular structural web articles of thermoplastic material comprising the steps: passing molten plastic material into a tubular mold cavity to fill a substantial portion of said cavity; injecting a low viscosity pressurizing fluid into said material in said mold cavity; coordinating the fluid flow rate, pressure, temperature and plastic material volume so that the pressurizing fluid divides into at least two streams on entering said material without causing the low viscosity pressurizing fluid to break t...
In a structural web article of thermoplastic material having a substantially continuous enveloping skin around the exterior of said article, at least one generally continuous, hollow center therein, at least one integral skin-connecting web positioned in said hollow center and at least one entry passage from the exterior to the hollow center(s) of said article through said enveloping skin, the improvement which comprises an article having at least two tubular channels each having hollow center(s) passing therethrough, said center(s) each originating at s...