Wood cement board and a manufacturing method thereof

• US 5,945,044 A
• Filed: 07/25/1997
• Issued: 08/31/1999
• Est. Priority Date: 05/29/1995
• Status: Expired due to Fees

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Nekota, Takeshi, Kawai, Hidenori
• Primary Examiner(s): DAVIS, JENNA L
• Application Number:
  US08/903,253
• Time in Patent Office: 767 Days
• Field of Search: 156/39, 106/731, 264/37, 264/240, 264/319, 264/299, 264/328.2, 264/37.29
• US Class Current: 264/37.29
• CPC Class Codes: C04B 18/28 Mineralising; Compositions therefor
• CPC Class Codes: C04B 40/006 involving the elimination of excess water from the mixture
• CPC Class Codes: Y02W 30/91 Use of waste materials as fillers for mortars or concrete

Abstract

A wood cement board substantially consisting of reinforcing wood material and a cement wherein said reinforcing wood material is treated by a method comprising attaching an aqueous solution of a mineral acid and adding and mixing an alkaline metal silicate in said reinforcing wood material to prevent the inhibition of hardening of cement by sugar contained said reinforcing wood material is provided in the present invention. According to the present invention, a wood cement board having a high strength is constantly manufactured by using reinforcing wood material made from wood having a big amount of sugar as an inhibiter of hardening of cement such that reinforcing wood material regenerated from wood scrap can be used in wood cement board without any problem.

Claims

1. A manufacturing method of a wood cement board comprising the steps of:

preparing a raw material mixture containing principally a reinforcing wood material and a cement wherein said raw material mixture has a water content in the range between 35 to 45% by weight by adding water, scattering said mixture on a mold panel to form a mat, and pressing and incubating said mat with said mold panel to harden said mat wherein said reinforcing wood material is treated by a method consisting of;

treating said reinforcing wood material with an aqueous solution of a mineral acid selected from a group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, and nitric acid and then treating said reinforcing wood material with an alkaline metal silicate to form a silicate gel film on the surface of said reinforcing wood material prior to the preparation of said raw material mixture.

2. A manufacturing method of a wood cement board in accordance with claim 1 wherein said reinforcing wood material is regenerated from wood scrap.