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US 10,330,094 B2Granted
Sealing diaphragm and methods of manufacturing said diaphragm
AssigneeBlue-White Industries, Ltd.
InventorsRobert E. Gledhill, III, John T. Nguyen, Steve L. Smith
Life of this patent
Estimating the term…
Abstract
Described is a method for manufacturing a diaphragm assembly through the use of injection molding. The method can avoid the use of PTFE as a chemically resistant coating. Further, the method can increase overall adherence of a polymer diaphragm to an insert through the use of an interference surface on at least the surface of a head of the insert.
Claims27
A method for manufacturing a diaphragm assembly comprising:
- forming an insert having a head and a body, wherein the head is located at one end of the body;
- forming at least one interference surface on the insert;
- disposing the insert within a cavity configured for injection molding, wherein at least the head is completely disposed within the cavity;
- and
- injection molding a polymer onto the insert, wherein the polymer is configured to adhere to the head and the at least one interference surface of the insert;
- wherein the polymer is a PVDF polymer comprising 0.5% by weight natural PVDF and 99.5% by weight of a PVDF polymer having a density of 1.77 grams per cubic centimeter, a water absorption of 0.030%, a tensile yield strength of 6.50 MPa, an elongation at break of greater than 50%, an elongation at yield of 20%, a tensile modulus of 0.0800 GPa, a melting point of 101° C., a deflection temperature at 1.8 MPa of 46.0°, an oxygen index of 40%, and a melt viscosity in a range between 12.0 and 20.0 kilopoise when said melt viscosity is tested at 232° C. according to American Standard Test Method D3835.
3 more elements
A two part diaphragm assembly comprising:
- an insert having a head and a body, wherein the head is located at one end of the body;
- at least one interference surface formed on the insert;
- and
- an injection-molded polymer diaphragm configured to at least partially surround the head of the insert and interfere with the at least one interference surface, wherein the polymer is a PVDF polymer comprising 0.5% by weight natural PVDF and 99.5% by weight of a PVDF polymer having a density of 1.77 grams per cubic centimeter, a water absorption of 0.030%, a tensile yield strength of 6.50 MPa, an elongation at break of greater than 50%, an elongation at yield of 20%, a tensile modulus of 0.0800 GPa, a melting point of 101° C., a deflection temperature at 1.8 MPa of 46.0°, an oxygen index of 40%, and a melt viscosity in a range between 12.0 and 20.0 kilopoise when said melt viscosity is tested at 232° C. according to American Standard Test Method D3835.
1 more element
A positive displacement pump comprising:
- an input channel;
- an output channel;
- and
- a diaphragm assembly located between the input and output channel and configured to translate liquid from the input channel to the output channel, the assembly comprising:
- an insert having a head and a body, wherein the head is located at one end of the body;
- at least one interference surface formed on the insert;
- and
- an injection-molded polymer diaphragm configured to at least partially surround the head of the insert and interfere with the at least one interference surface, wherein the polymer is a PVDF polymer comprising 0.5% by weight natural PVDF and 99.5% by weight of a PVDF polymer having a density of 1.77 grams per cubic centimeter, a water absorption of 0.030%, a tensile yield strength of 6.50 MPa, an elongation at break of greater than 50%, an elongation at yield of 20%, a tensile modulus of 0.0800 GPa, a melting point of 101° C., a deflection temperature at 1.8 MPa of 46.0°, an oxygen index of 40%, and a melt viscosity in a range between 12.0 and 20.0 kilopoise when said melt viscosity is tested at 232° C. according to American Standard Test Method D3835.
5 more elements
Dependencies are inferred from the claim text.