TH75360A - How to make pneumatic tires - Google Patents

Abstract

The DC60 pneumatic tire manufacturing process involves raw rubber production and vulcanization. The raw rubber consists of the toroidal main body and the tread ring. The tread ring comprises tread reinforcement strips and raw tread rubber arranged radially on the outside of the reinforcement strips. Tread ring making involves using a forming drum with a pair of side cylindrical surfaces and a central cylindrical surface in between to define the depth and width of the deformation zone. The tread reinforcement strips are wrapped onto the central cylindrical surface so that the edges of the strips are positioned at the edges of the deformation zone. The tread rubber is then formed by wrapping at least one strip of rubber onto the wrapping surfaces, which are formed by the aforementioned side cylindrical surfaces and the outer circumferential surfaces of the reinforcement strips within the width of the deformation zone. At the edges, the depth of the deformation is relatively equal to the thickness of the tread reinforcement strips. The raw rubber tread is arranged on the outer radial side of the tread reinforcing band. The ring making process involves using a forming drum equipped with a pair of side cylindrical surfaces and a central cylindrical surface in between to define the depth and width of the deformation zone. The reinforcing band is wrapped around the central cylindrical surface so that its edge is positioned at the border of the deformation zone. The rubber tread is then formed by wrapping at least one rubber strip onto the forming wrapping surfaces, which are positioned by the aforementioned side cylindrical surfaces and the outer circumferential surfaces of the reinforcing band within the width of the deformation zone. At this border, the depth of the deformation is roughly equal to the thickness of the reinforcing band.

Claims (6)

1. The manufacturing process of pneumatic tires consists of: Raw rubber production. The raw rubber consists of a toroidal main body and a tread ring arranged on the face of the toroidal main body. The toroidal main body consists of a thin carcass and raw rubber components, and the tread ring consists of a reinforcing band and raw tread rubber arranged radially on the outside of the reinforcing band. The vulcanization of the raw rubber involves: Tread ring making, which uses a forming drum arranged with a pair of lateral cylindrical surfaces and a central cylindrical surface in between to define the depth and width of the deformation zone; wrapping the reinforcing band on the central cylindrical surface so that the edges of the reinforcing band are positioned at the edge of the deformation zone; and tread shaping by wrapping at least one rubber strip on the wrapping surface, which is formed by the aforementioned lateral cylindrical surfaces and the outer circumferential surface of the reinforcing band within the width of the deformation zone. At the edge, the depth of the deformation is approximately equal to the thickness of the reinforcing band. 2. Method for manufacturing pneumatic tires according to claim 1, where the depth of deformation is between 80 and 120% of the thickness T of the strapping sheet. 3. Methods of manufacturing pneumatic tires under claim 1 or 2 where the width of the deformation is 0.5 to 2.0 mm greater than the width of the tread reinforcement band. 4. Method of manufacturing pneumatic tires under claim 1, in which the tread reinforcement belt consists of reinforcement layers made of cords arranged at an angle from 5 to 45 degrees relative to the equator of the tire. 5. The method of manufacture of pneumatic tires under claim 1, in which the tread reinforcement belt consists of a canvas strip made of cords wound in a spiral. 6. Method of manufacture of pneumatic tires under Reputation 1, where the tread reinforcement belt includes a reinforcement layer consisting of two transverse canvas layers with cords arranged at an angle of 5 to 45 degrees relative to the equator of the tire, and a canvas strip consisting of at least one layer of canvas with spirally wound cords arranged on the reinforcement layer.