Method for molding rubber product
AssigneeToyoda Gosei Co., Ltd.
InventorsGunpei Katsumura, Tomoaki Okita
Life of this patent
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Abstract
A method of molding a rubber product from a rubber compound by a molding apparatus having a kneading region. A full amount of carbon black (CB) and a full amount of process oil, together with other auxiliary materials except vulcanizing chemicals, are compounded with raw rubber to thereby knead and prepare a granular master batch (granular MB) . The rubber product is extrusion-molded and vulcanized after vulcanizing chemicals (a vulcanizing agent and a vulcanization accelerator) are quantitatively supplied into the kneading region of the molding apparatus through a material supply port while the vulcanizing chemicals are mixed with the granular MB.
Claims7
A method of molding a rubber product from a rubber compound consisting essentially of:
- compounding a substantially full amount of carbon black (CB) and a substantially full amount of process oil with raw rubber to prepare a precursory compound;
- kneading said precursory compound to prepare at least one granular master batch (granular MB);
- transporting said one granular MB in an extrusion molding apparatus having a mixer, a kneading region and an extrusion region;
- mixing and dispersing vulcanizing chemicals into said one granular MB to prepare a rubber compound in said mixer of said extrusion molding apparatus;
- kneading said rubber compound by supplying said rubber compound into said kneading region of said extrusion molding apparatus;
- and
- extruding said kneaded rubber compound in said extrusion region of said extrusion molding apparatus to thereby mold said rubber product.
Dependencies are inferred from the claim text.