Processing method of straws and manufacturing method of straw fiber plate

Abstract

The invention discloses a processing method of straws, which comprises the steps of: (1) cutting off straws which are harvested just now into segments of 5-15 mm in length, then removing iron by a magnetic drum, and then crushing the segments into straw blocks of 5-10 in length, width and height; (2) performing microwave radiation on the straw blocks; and (3) immerging the straw blocks in water, adding hydrofluoric acid, mixing until pH is 5-6 and washing with water until the pH is 6.5-7, and then centrifuging and separating. The invention has the beneficial effects as follows: by processing the straws with microwaves, partial or all the silicon cells and suberisation cells are damaged so that the hydrofluoric acid in the acidifying step immerges into the cells to dissolve SiO2, thereby reducing content of the SiO2 in the straw fiber, improving bonding performance of the straw fiber and further improving intensity of a straw fiber plate. The straw fiber plate in the invention has dense texture; and after a saw cutting process, the straw fiber plate compared with the normal shaving board has an even, bright and clean surface and has an internal bonding intensity of 0.56-0.65 MPa, a static bending strength of 30-60 MPa, an elastic modulus of 3000-4000 MPa and a screw holding capability of the plate surface of 1600-1750 N.

Description

technical field

[0001] The invention relates to a straw processing method and a straw fiber board manufacturing method. Background technique

[0002] The use of crop straw to produce wood-based panels probably originated in the 1920s. At that time, the United States established the world's first bagasse fiberboard factory. After the end of the 1940s, wood-based panel factories using economic crop stalks such as bagasse, hemp stalks, and cotton stalks as raw materials have developed to varying degrees in some countries, but most of them have not, except for a few bagasse board factories and hemp chip board factories. survived for a long time. In recent years, due to the shortage of resources brought about by the increasing demand for wood and wood-based panel resources, especially more and more countries and regions have banned or restricted the burning of crop straws in order to protect the environment, which has aroused people's interest in using crop straws to manufactur...

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