Apparatus for molding beads expandable and formable under heat and pressure

Abstract

Abstract Apparatus for molding material expandable and formable under heat and pressure comprising a first mold member which is hollow and open at one end and of uniform internal cross section along an axis perpendicular to the open end, a second mold member comprising a central element and end elements connected with the central element and spaced apart longitudinally of the central element, the external cross section of the end elements conforming to the uniform internal cross section of the first mold member so that when the second mold member is inserted into the first mold member through the open end of the first mold member a mold cavity is formed within the first mold member with the spaced apart end elements of the second mold member defining the ends of the mold cavity, means for introducing material expandable and formable under heat and pressure into the thus formed mold cavity, means for admitting to the mold cavity a medium for subjecting said material to heat and pressure to form in the mold cavity a product having the shape of the mold cavity and means for withdrawing the second mold member with said product from the first mold member through the open end thereof. The central element may be hollow and have transverse holes therein and means may be provided for introducing into the mold cavity through the central element and through the transverse holes therein the medium for subjecting the material in the mold cavity to heat and pressure. The central element may be formed so as to divide the mold cavity into a plurality of isolated portions extending longitudinally of the mold cavity between the end elements with means for introducing the material expandable and formable under heat and pressure into each of the isolated portions of the mold cavity to produce in each such portion a product having the shape thereof.

Inventors

• 👤 John A Noel

Bibliographic Details