Method and apparatus for forming seal portion of tubular body of synthetic resin
AssigneeYoshino Kogyosho Co., Ltd.
InventorMamoru Fujita
Life of this patent
Estimating the term…
Abstract
An apparatus and method for forming a seal portion of a tubular body of synthetic resin is provided in which the seal portion has increased density and reduced foaming. The apparatus includes a pair of clamps that clamp an end portion of a tubular body of resin flat. A heater heats and fuses a projecting end portion projecting from the clamps. A bending member bends side projecting portions of the body formed during heating so that they are inwardly projecting. A press member presses the projecting end portion to form a seal portion.
Claims8
A method for forming a seal portion of a tubular body of synthetic resin, which comprises the process of:
- clamping an end portion of a tubular body of synthetic resin flat by a pair of clamps to form a clamped, flattened end portion of a predetermined width and an original volume and a projecting end portion projecting out of said clamps;
- heating and fusing said projecting end portion, said heating and fusing forming side projecting portions of said projecting end portion projecting outward from opposing sides of said projecting end portion beyond said width of said clamped, flattened end portion;
- bending said side projecting portions inwardly substantially perpendicular to said clamped, flattened end portion;
- and
- pressing said projecting end portion including said side projecting portions into a desired shape to form a seal portion, while reducing a cubic volume of said projecting end portion to 0.65-0.80 times the original volume.
A method for forming a seal portion of a tubular body of synthetic resin, which comprises the process of:
- clamping an end portion of a tubular body of synthetic resin flat by a pair of clamps to form a clamped, flattened end portion of a predetermined width and a projecting end portion projecting out of said clamps;
- heating and fusing said projecting end portion, said heating and fusing forming side projecting portions of said projecting end portion projecting outward from opposing sides of said projecting end portion beyond said width of said clamped, flattened end portion;
- bending said side projecting portions inwardly substantially perpendicular to said clamped, flattened end portion;
- and
- pressing said projecting end portion including said side projecting portions into a desired shape to form a seal portion, while reducing and restricting decomposition and foaming of the synthetic resin.
An apparatus for forming a seal portion of a tubular body of synthetic resin which comprises:
- a pair of clamps, which clamp an end portion of a tubular body of synthetic resin flat to form a clamped, flattened end portion having a width and a projecting end portion projecting axially from said clamps;
- a heater, which heats and fuses said projecting end portion to form a fused projecting end portion having side projecting portions extending outside of said clamped end portion width;
- a bend means for bending said side projecting portions toward a center of said bend means to form inwardly bent side projecting portions;
- and
- a press mold means for pressing said projecting end portion including said inwardly bent side projecting portions to form a seal portion.
Dependencies are inferred from the claim text.