Apparatus for forming expanded panels
First Claim
Patent Images
1. In a device for expanding the cross section of a blank of thermoformable material which includes a machine having first and second opposed press platens;
- means for controlling the spacing of the press platens, first and second molding plates; and
means attaching the mold plates to the press plates, the improvement comprising the means attaching the press platens comprising;
(a) a plurality of elongated studs distributed over the area of the molding plates the length of said studs being such as to satisfy the equation;
D=C-√
C2 -X2 where D equals one-half the maximum deviation permissable in panel thickness, C the length of the bolts and X the amount of thermal expansion in one half of the mold based on the mold material used and the temperature differential to be employed;
(b) means for attaching one end of each of said studs to a press platen; and
(c) means for attaching the other end of said studs to a mold plate.
1 Assignment
0 Petitions
Accused Products
Abstract
In order to make large panels of expanded thermoformable material in a process in which a blank of the material is placed between two heated mold plates, the blank adhered to the plates by hot tack adhesion; the plates separated and the expanded material cooled, while maintaining commercial tolerances, the mold plates are supported on elongated mounting studs.
39 Citations
10 Claims
-
1. In a device for expanding the cross section of a blank of thermoformable material which includes a machine having first and second opposed press platens;
- means for controlling the spacing of the press platens, first and second molding plates; and
means attaching the mold plates to the press plates, the improvement comprising the means attaching the press platens comprising;(a) a plurality of elongated studs distributed over the area of the molding plates the length of said studs being such as to satisfy the equation;
D=C-√
C2 -X2 where D equals one-half the maximum deviation permissable in panel thickness, C the length of the bolts and X the amount of thermal expansion in one half of the mold based on the mold material used and the temperature differential to be employed;(b) means for attaching one end of each of said studs to a press platen; and (c) means for attaching the other end of said studs to a mold plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- means for controlling the spacing of the press platens, first and second molding plates; and
-
10. In a device which includes a machine having first and second flat planar members;
- means for controlling the spacing of the planar members, and means attaching the planar members to a support structure, the improvement comprising the means attaching the planar members comprising;
(a) a plurality of elongated studs distributed over the area of the planar members the length of said studs being such as to satisfy the equation;
D=C-√
C2 -X2 where D equals the maximum deviation permissable in bending of the member C the length of the bolts and X the amount of thermal expansion in the planar members based on the material of which they are made and the temperature differential to be employed;(b) means for attaching one end of each of said studs to the support structure; and (c) means for attaching the other end of said studs to a planar member.
- means for controlling the spacing of the planar members, and means attaching the planar members to a support structure, the improvement comprising the means attaching the planar members comprising;
Specification