Semipermeable membrane for pressing apparatus
AssigneeVoith Sulzer Papiertechnik GmbH
InventorDavid A. Beck
Life of this patent
Estimating the term…
Abstract
A unitary membrane for use in a pressing apparatus includes a semipermeable portion structured and adapted to have a permeability which permits a predetermined fluid flow therethrough, which is positioned between a pair of longitudinal edge portions, wherein the unitary membrane includes a polymeric fabric. The unitary membrane has a thickness less than about 0.1 inches. A plurality of holes are formed through the polymeric fabric at the semipermeable portion. The semipermeable portion has a permeability greater than zero and less than about five CFM per square foot as measured by TAPPI test method TIP 0404-20.
Claims12
A unitary membrane adapted for enhancing de-watering of a continuous fiber web in a pressing apparatus, comprising:
- a pair of longitudinal edge portions;
- and
- a semipermeable portion positioned between said pair of longitudinal edge portions, wherein said unitary membrane comprises a polymeric fabric, said unitary membrane having a thickness less than about 0.1 inches and having a plurality of holes formed through said polymeric fabric at said semipermeable portion, said semipermeable portion having a permeability greater than zero and less than about five CFM per square foot as measured by TAPPI test method TIP 0404-20.
A unitary membrane for use in a pressing apparatus comprising:
- a pair of longitudinal edge portions, said pair of longitudinal edge portions being tapered such that a cross-section of said unitary membrane has a trapezoidal shape;
- and
- a semipermeable portion positioned between said pair of longitudinal edge portions, wherein said unitary membrane comprises a polymeric fabric, said unitary membrane having a thickness less than about 0.1 inches and having a plurality of holes formed through said polymeric fabric at said semipermeable portion, said semipermeable portion having a permeability greater than zero and less than about five CFM per square foot as measured by TAPPI test method TIP 0404-20.
A unitary membrane for use in a pressing apparatus comprising:
- a pair of longitudinal edge portions, said pair of longitudinal edge portions being impermeable;
- and
- a semipermeable portion positioned between said pair of longitudinal edge portions, wherein said unitary membrane comprises a polymeric fabric, said unitary membrane having a thickness less than about 0.1 inches and having a plurality of holes formed through said polymeric fabric at said semipermeable portion, said semipermeable portion having a permeability greater than zero and less than about five CFM per square foot as measured by TAPPI test method TIP 0404-20.
A unitary membrane for use in a pressing apparatus, comprising:
- a pair of longitudinal edge portions;
- and
- a semipermeable portion positioned between said pair of longitudinal edge portions, wherein said unitary membrane comprises a polymeric fabric, said polymeric fabric forming a flow resistance layer near a surface of said unitary membrane, said unitary membrane having a thickness less than about 0.1 inches and having a plurality of holes formed through said polymeric fabric at said semipermeable portion, said semipermeable portion having a permeability greater than zero and less than about five CFM per square foot as measured by TAPPI test method TIP 0404-20.
A unitary membrane for use in a pressing apparatus, comprising:
- a pair of longitudinal edge portions;
- a semipermeable portion positioned between said pair of longitudinal edge portions, wherein said unitary membrane comprises a polymeric fabric, said unitary membrane having a thickness less than about 0.1 inches and having a plurality of holes formed through said polymeric fabric at said semipermeable portion, said semipermeable portion having a permeability greater than zero and less than about five CFM per square foot as measured by TAPPI test method TIP 0404-20;
- and
- a membrane surface which is abrasion resistant.
Dependencies are inferred from the claim text.