SHORT FIBER REINFORCEMENT OF EXTRUDED RUBBER PROFILES

In the extrusion of fiber reinforced rubber compounds to produce various industrial profiles, such as the tire bead filler, care must be taken to avoid inherent structural defects produced by the die flow. Surface roughness and edge tearing result from the action of shear and extensional forces on the weak fracture planes within the short fiber composite. Lowering the fiber level and stiffening the matrix (in particular, by reducing oil and increasing carbon black concentrations) improve the coherency of the extrudate by relieving stress concentrations and increasing the green strength of the stock. Die design and processing conditions also play a role in determining the magnitude of the disruptive stresses. The high stiffness required in a tire bead filler can best be provided by short fiber reinforcement. A simple extrusion of a 10 wt. % fiber composite stock through a contoured profile die, following the design criteria set forth in this paper for axial fiber alignment should suffice for production of a tire bead filler strip. Other applications may require some degree of area expansions within the die to produce a higher transverse fiber orientation and stiffness. In all cases, the good processing attributes of the treated short cellulose fiber will promote cost-effective reinforcement.

• Corporate Authors:

  Bill Commuications, Incorporated

  633 Third Avenue
  New York, NY  United States  10017
• Authors:
  • Goettler, L A
  • Sezna, J
  • DiMauro, P J
• Publication Date: 1982-10

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 33-42
• Serial:
  • Rubber World
  • Volume: 187
  • Issue Number: 1
  • Publisher: Bill Commuications, Incorporated

Subject/Index Terms

• TRT Terms: Cellulose; Extrusion; Fibers; Fillers (Materials); Machine tools; Material reinforcement; Rubber; Tires
• Uncontrolled Terms: Profiles
• Old TRIS Terms: Dies
• Subject Areas: Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00371126
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: HS-033 913
• Files: HSL, USDOT
• Created Date: Mar 31 1983 12:00AM