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Method and apparatus for dispensing viscous materials

  • US 4,030,640 A
  • Filed: 11/10/1975
  • Issued: 06/21/1977
  • Est. Priority Date: 11/10/1975
  • Status: Expired due to Term
First Claim
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1. In a high viscosity material dispenser having a discharge port in material flow communication with a deformable tube coupled to receive material from a reservoir from where the high viscosity material is obtained for dispensing with a normally open pinch valve operatively located between the discharge port and the reservoir to deform the tube for the discharge of material, the improvement comprisingfirst means for simultaneously pressurizing the material in the reservoir and closing the pinch valve to deform the tube against pressurized material and reduce the volume of the tube for the dispensation of a desired amount of high viscosity material contained in the segment of the tube located between the pinch valve and the discharge port, and second means for simultaneously reducing pressurization of the material in the reservoir and opening the pinch valve to enable the tube to increase its volume for a suck-back of the material at the discharge port and a crisp cut-off from dispensed material.

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