Method of making wet-pressed fiberboard of high resistance to bending
Patent 4032394 Issued on June 28, 1977. Estimated Expiration Date: 
June 28, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 28, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1687140 1780623 1821209 3243340 3391233 3493463 3665065 Biaxially oriented nonwoven fabrics and method of making same Patent #: 3969561 InventorApplicationNo. 05/579243 filed on 05/20/1975US Classes:162/164.1, Synthetic resin162/165, Phenol-aldehyde162/185, Part added to furnish or pulp162/215, Counter or transverse of mold movement162/225, Boards or sheets162/336Flow box, slice, and/or approach flowExaminersPrimary: Bashore, S. LeonAssistant: Fisher, Richard V. Attorney, Agent or FirmForeign Application Priority Data1974-05-20 SWAbstractWet pressed fiber board material of high resistance to bending is produced by preparing a layer of fiber from a water suspension of the fiber, said layer being de-watered and pressed to form a coherent flat sheet, wherein raw material is distributed over the surface of said layer in varying quantities and/or qualities in a manner such that the pressed board obtains strip-like surface portions which extend in at least one direction of the horizontal plane of the sheet, said strip-like surface portions having varying density and/or strength properties, whereby the finished board has a higher resistance to bending than a homogeneous sheet having substantially the same average density.Field of SearchNon-uniform internal structureWith cutting and/or slitting With heating and/or cooling Directing slurry into association with mold Counter or transverse of mold movement Plural stage deposition Boards or sheets Articles Surface treatment Phenol-aldehyde Non-uniform, irregular or configured web or sheet Layers of different properties Organic additive Fiber Flow box, slice, and/or approach flow With vanes or pulp stream dividing means | |
