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US 6,146,498 AGranted
Wound product cores and processes for making them
AssigneeKimberly-Clark Worldwide, Inc.
InventorsJay C. Hsu, James J. Tanner
Life of this patent
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Abstract
The present invention provides a core for receiving a wound product wherein the core is made of a waste sludge produced in a papermaking process. The process for making the core includes the steps of mixing the sludge with a binder material, which may be either a wet strength or a dry strength agent, and then compressing the mixture into a core through a process such as extrusion or molding. Optionally, the sludge may be dried prior to mixing with the binder material.
Claims17
A process for producing a core in the shape of a cylindrical tube, said process comprising the following steps:
- a) providing a sludge from a papermaking process;
- b) forming a mixture by mixing said sludge with a binder material;
- c) providing said mixture to a core-forming device that allows the volume of material entering the device to be reduced as the core is formed;
- and
- d) compressing said mixture into a core by applying a gradually increasing pressure to said mixture so as to gradually decrease the volume of said mixture and to allow excess moisture from said mixture to be evaporated.
2 more elements
Dependencies are inferred from the claim text.