Reinforced support sheet and method for making same
AssigneeElring Dichtungswerke GmbH
InventorsHorst Sommer, Hansgeorg Gronle
Life of this patent
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Abstract
A reinforced support sheet or plate, especially for making flat gaskets or heat dampening plates is made of a sheet or plate-like support material which is covered with a vulcanizable soft material layer which contains a fiber-like and, if need be, powder-like binder material. The support material is smooth and the soft layer material is composed predominantly of a powder-like, asbestos-free mineral base material. A method for making such a sheet or plate is also disclosed.
Claims6
A method of making a reinforced support sheet for use in forming gaskets and heat resistant plates, the support sheet being of the type including a sheet-like, smooth support material and a layer of vulcanizable soft material covering each of the sides of said sheet-like support material, comprising the steps of:
- preparing a composition of an elastomeric soft material comprised by weight of at least 80% of an asbestos-free, mineral base material, up to 14% of an asbestos-free fiber material, and about 6% of an elastomeric binder material;
- feeding said sheet-like support material successively between two separate pairs of calender rollers, the two rollers of each pair of which are driven at different circumferential speeds;
- applying a layer of said soft elastomeric material as a flowable bulk material successively onto both sides of said support material by means of said calender rollers, said soft elastomeric material being applied onto one side of said support material immediately before it enters the nip between one pair of calender rollers and said soft elastomeric material being applied to the other side of said support material immediately before it enters the nip between the other pair of calender rollers;
- and
- drying and vulcanizing said layers of soft elastomeric material in an oven.
Dependencies are inferred from the claim text.