초록 ▼

An extruded hollow plastic board is described which has a pair of flat and parallel sheets spaced apart and interconnected by longitudinally extending ribs. The ribs and sheets are connected with rounded joint areas, which significantly improve the mechanical properties and solve undercut and die li

An extruded hollow plastic board is described which has a pair of flat and parallel sheets spaced apart and interconnected by longitudinally extending ribs. The ribs and sheets are connected with rounded joint areas, which significantly improve the mechanical properties and solve undercut and die line problems existing with prior art hollow plastic boards. This invention also provides a method for the manufacture of the hollow board of thermoplastic resin thereof.

대표청구항 ▼

A hollow plastic board of thermoplastic material, which consists essentially of: a first planar sheet and a second planar sheet disposed in substantially parallel spaced relation to one another and with a single row of a plurality of laterally spaced coextruding ribs extending between the first and

A hollow plastic board of thermoplastic material, which consists essentially of: a first planar sheet and a second planar sheet disposed in substantially parallel spaced relation to one another and with a single row of a plurality of laterally spaced coextruding ribs extending between the first and second planar sheets and having connecting points where each rib connects to said first planar sheet and to said second planar sheet, and forming in combination with the sheets, a single row of a plurality of elongated lateral passageways through the sheeting, and having a rounded joint area at each of said connecting points of said planar sheets and said rib, said rounded joint area at each of said connecting points significantly improving the mechanical properties of said hollow plastic board, and eliminating undercut and die line problems during production, said elongated lateral passageways have a predetermined height h and a predetermined width w, and said rounded joint areas having a predetermined radius R which is defined by the following formula: 0.01 (w+h)≤2R≤0.15 (w+h).