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.
Claims8
A method of molding a rubber product from a rubber compound by a molding apparatus having a kneading region, comprising steps 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 kind of granular master batch (granular MB);
- mixing and dispersing vulcanizing chemicals into said one kind of granular MB to prepare a rubber compound;
- and
- kneading said rubber compound by supplying said rubber compound into said kneading region of said molding apparatus to thereby mold said rubber product.
A rubber compound comprising:
- at least one kind of granular master batch (granular MB) prepared by kneading a precursory compound obtained by compounding a substantially full amount of CB and a substantially full amount of process oil with raw rubber;
- and
- vulcanizing chemicals mixed and dispersed into said at least one kind of granular MB.
A method of molding a rubber product by a molding apparatus having a kneading region, comprising steps 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 kind of granular master batch (granular MB);
- and
- molding said rubber product after supplying said at least one kind of granular MB and vulcanizing chemicals directly into said kneading region of said molding apparatus and kneading and dispersing them in said kneading region.
Dependencies are inferred from the claim text.