Gasket Formed From Various Materials And Methods Of Making Same
A gasket is provided for creating a seal between two surfaces. The gasket may include a pervious base sheet and a permeating material applied to or incorporated into the base sheet. The gasket is formed by various methods disclosed herein. The gasket may include a base sheet, a primary sealing material covering and/or impregnated the base sheet, and a secondary sealing material covering the primary sealing material. The secondary material may be applied in a predetermined pattern of raised and lowered sections or may be applied as a bead of sealing material. The secondary material may be applied through a variety of techniques including jetting and dispensing using robots such that beads with custom engineered and changing configurations along their lengths are possible. These custom engineered sealing beads provide optimum sealability over the entire area of a joint to be sealed.
1 . A method of making a gasket having a base sheet with a patterned polymeric surface bead comprising the steps of progressively dispensing a bead of polymeric material onto the surface of the gasket in a predetermined pattern.
2 . The method of claim 1 and further comprising varying the speed at which the surface bead is progressively dispensed to produce a bead that varies in characteristics along the bead.
3 . The method of claim 1 and further comprising varying the rate at which the surface bead is progressively dispensed to produce a bead that varies in characteristics along the bead.
4 . A method of making a gasket with a patterned polymeric coating comprising controllably dispensing polymeric material onto the surface of the gasket in a predetermined pattern.
5 . The method of claim 4 and wherein the step of controllably dispensing comprises varying the rate at which polymeric material is dispensed onto the surface to produce a coating that varies in characteristics.
6 . The method of claim 5 and wherein the coating is a bead.
7 . A gasket for sealing two abutting flange surfaces comprising:
a base sheet formed of mesh screen impregnated with a first polymeric material;
at least one bead of a second polymeric material on a surface of the base sheet;
the at least one bead of a second polymeric material varying in dimension along its length to provide sealing properties that are different in different regions of the flange surfaces.
8 . The gasket of claim 7 and wherein the bead varies in height.
9 . The gasket of claim 7 and wherein the bead varies in width.
10 . A method of forming a bead of sealing material on a surface of a gasket comprising progressively depositing sealing material on the surface of the gasket with a process selected from the group consisting of jetting and dispensing.
11 . The method of claim 10 and further comprising varying the dimensions of the bead as it is progressively deposited on the surface of the gasket.