Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1974-04-01
1976-01-20
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
156228, 156245, 156292, 264236, 264250, 264327, 425519, B29H 702
Patent
active
039339670
ABSTRACT:
Seamless hollow molding rubber articles are produced by concurrently molding two article halves with mateable edges which extend toward each other. Portions of the mold plates and core are maintained continuously at the full vulcanizing heat until the halves of the articles have been vulcanized to about 60 percent of the optimum vulcanization of the material, except for thin strata defining the mateable edges. By cooling at the portions which form these strata, these portions are maintained at a lesser temperature to cause the reaction in these strata to progress slightly beyond the scorching or blowing stage to dimensional and volumetric stability. At this stage, the mateable faces of the edges are substantially free from the usual "skin" effect which effect would render them non-fusible. The mold is then opened, the core is removed, and the mold is reclosed. The article halves are resilient, but firm enough to force the strata of the mateable edges into firm pressure bonding and fusing contact without distortion of the remainder of the halves. Due to the limited amount of material in the strata, only a small total amount of heat is required to carry the vulcanization reaction of the strata to the same stage as that of the halves. Consequently, the heat of the mold and of the remainder of the halves is sufficient to fuse and vulcanize the mateable edge strata quickly and fully. The resultant bond of the edges and adjacent strata is homogeneous with the remainder of the halves.
REFERENCES:
patent: 1134433 (1915-04-01), Aylsworth et al.
patent: 1365462 (1921-01-01), Crawford
patent: 1575388 (1926-03-01), Roberts
patent: 1813797 (1931-07-01), Foley
patent: 2363508 (1944-11-01), Doster et al.
Leonard John Harrow
Silbaugh Jan H.
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