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JP-7857187-B2 - Manufacturing method for pneumatic tires

JP7857187B2JP 7857187 B2JP7857187 B2JP 7857187B2JP-7857187-B2

Inventors

  • 泉原 優史

Assignees

  • ＴＯＹＯ ＴＩＲＥ株式会社

Dates

Publication Date
20260512
Application Date
20220819

Claims (4)

  1. The process involves winding the long rubber material extruded from the extruder onto a winding cylinder, The process of pulling out the long rubber member from the winding cylinder and cutting it to cut out the rubber member for the tire tread, A step of wrapping the cut-out tread rubber material around a drum to form a ring-shaped tread, In a method for manufacturing a pneumatic tire, A method for manufacturing a pneumatic tire, characterized in that the winding cylinder has a cylindrical body which is the portion around which the long rubber member is wound, and the diameter of the body is greater than or equal to the diameter of the drum.
  2. The method for manufacturing a pneumatic tire according to claim 1, wherein the length of the long rubber member wound onto the winding cylinder is the length of 10 to 16 of the tread rubber members.
  3. A method for manufacturing a pneumatic tire according to claim 1 or 2, wherein the long rubber member is cut using an ultrasonic cutter.
  4. A method for manufacturing a pneumatic tire according to claim 1 or 2, wherein when cutting the long rubber member, the angle between the bottom surface of the long rubber member and the cut surface is 25 ± 4°.

Description

This invention relates to a method for manufacturing pneumatic tires. The tread of a pneumatic tire is formed by molding a rubber tread component into a ring shape. During the manufacturing of the rubber tread component, a long rubber component is first extruded from an extruder. This long rubber component has a width and thickness similar to that of the pneumatic tire tread and is long in the extrusion direction. The extruded long rubber component is wound onto a winding cylinder called a reel or bobbin (see, for example, Patent Document 1). The winding cylinder has a small diameter. A length of rubber component equivalent to several dozen tread components is wound onto this winding cylinder. The long rubber material, wound onto a winding cylinder, is transported to a molding area with a drum. There, the long rubber material is pulled from the winding cylinder and cut, producing tread rubber pieces the length of one tire. These cut tread rubber pieces are then wound onto the drum and molded into a ring shape. Japanese Patent Publication No. 2018-34936 A perspective view of a long rubber component, seen from diagonally above.(a) is a perspective view of the tread rubber component seen from diagonally above. (b) is a side view of the tread rubber component. (c) is a magnified view of the vicinity of the cross-section of (b).A perspective view of the ring-shaped tread, seen from the side at an angle.A side view of the winding area for long rubber components.A view of the winding cylinder from the direction of arrow A in Figure 4.A side view of the ring-shaped tread manufacturing equipment in the molding area.Block diagram of a ring-shaped tread manufacturing machine.A diagram showing the winding process of a long rubber material.A side view of the ring-shaped tread manufacturing machine. A diagram showing the cutting of a long rubber component.A top-down view of a part of the cutting device. The image shows the cutting of a long rubber component.A side view of a part of the cutting device. The image shows the cutting of a long rubber component.A side view of the ring-shaped tread manufacturing machine. A diagram showing the heating of the rubber material for the tread.A side view of a ring-shaped tread manufacturing machine. The diagram shows the process of winding the tread rubber material onto the drum. The embodiments will be described based on the drawings. Note that the embodiments described below are merely examples, and any modifications made within the scope of the present invention without departing from its spirit are included within the scope of the present invention. This embodiment relates to a method of cutting a long rubber member 1 (see Figure 1) at multiple points along its longitudinal direction to obtain multiple tread rubber members 2 (see Figure 2), and then forming a ring-shaped tread 3 (see Figure 3) from each of the tread rubber members 2. Here, the long rubber member 1 is a rubber member that is long in one direction. This "one direction" is the longitudinal direction of the long rubber member 1. The long rubber member 1 has a width and thickness similar to the tread of the final pneumatic tire (hereinafter simply referred to as "tire"). Furthermore, the tread rubber member 2 is a rubber member that forms the tread of one tire. The longitudinal direction of the tread rubber member 2 coincides with the longitudinal direction of the long rubber member 1. The length of the tread rubber member 2 in the longitudinal direction is approximately equal to the length of the tread in the tire circumference direction in the final completed tire. Since the tread rubber member 2 is cut from the long rubber member 1, it has the same width and thickness as the long rubber member 1. The bottom surface 2a of the tread rubber member 2 is the surface that was originally the bottom surface 1a of the long rubber member 1 (see Figure 11). The front and rear ends of the tread rubber member 2 are the cut surfaces 2b when the long rubber member 1 was cut. These cut surfaces 2b are inclined with respect to the bottom surface 2a. The "width" and "thickness" of the long rubber member 1 and the tread rubber member 2 refer to the lengths measured in a cross-section perpendicular to the longitudinal direction of the long rubber member 1 and the tread rubber member 2. The "width" is the length in the lateral direction of the bottom surfaces 1a and 2a. The "thickness" is the length in the direction perpendicular to the bottom surfaces 1a and 2a. Furthermore, the "lateral direction" refers to the direction perpendicular to the longitudinal direction when viewed from above. Figures 1 and 2 show the "longitudinal direction" and "lateral direction." Furthermore, the ring-shaped tread 3 is a rubber member formed by joining the front and rear ends of the tread rubber member 2 to create a ring shape. The bottom surface 2a of the tread rubber member 2 becomes the inner surface of the ring-shaped tread 3. The "front end" is th