Composite diaphragm for diaphragm pumps having two different sho

Details Composite diaphragm for diaphragm pumps having two different sho Composite diaphragm for diaphragm pumps having two different sho

1996-08-23

1998-01-13

Denion, Thomas E.

Expansible chamber devices

Collapsible chamber wall portion

Wall portion formed of flexible material

92103R, 92 96, 92261, F01B 1900

Patent

active

057067155

ABSTRACT:
A pump diaphragm that is composed of two different shore-hardness materials of the same base polymer. The diaphragm includes a strong layer that will withstand hydraulic pressures and one or more soft layers that can be shaped into desirable sealing configurations. The diaphragm is constructed by first injecting a first thermoplastic material, with a relatively lower percentage of rubber filler, into a mold cavity and allowing the first material to cure. The hardened first material is then placed into a second mold cavity. A second thermoplastic material which contains the same base polymer but a relatively higher percentage of rubber filler is then injected into the second cavity. The first and second material utilize the same base polymer and thus will have the same melt temperature, as well as a strong propensity to bond to each other when molten. The second material is introduced to the cavity at a temperature that melts the interface of the first material. As the second material and the interface hardness, the two layers have become chemically welded together. The second cavity gives shape to the sealing areas of the diaphragm.

REFERENCES:
patent: 4020828 (1977-05-01), Steed
patent: 4489127 (1984-12-01), Gutek et al.
patent: 4640272 (1987-02-01), Monett
patent: 4885121 (1989-12-01), Patel
patent: 5167905 (1992-12-01), Mentz et al.
patent: 5353689 (1994-10-01), Bolt et al.
patent: 5466146 (1995-11-01), Fritz et al.

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