Method for preventing end face of wood from severely cracking

Abstract

A method for preventing the end face of wood from severely cracking comprises the following steps that (1) the end face of solid wood is machined into a plane, and the plane is perpendicular to the grain direction of the solid wood; 2) a plurality of uniformly distributed conical steel nails in the direction vertical to the plane are nailed; and (3) the conical steel nails are taken down, and evenly-distributed nail holes are formed in the plane of the end of the solid wood. Six blade grooves are formed in the side face of each steel nail, nail bottoms are welded to a nail plate, a handle is welded to the other face of the nail plate, concentric circles are formed in the radial direction of the nail plate every 15 mm, the circle centers of the nail bottoms of the steel nails are located on the circumferential lines of the concentric circles, and the connecting line of the circle centers of any two conical steel nail bottoms on the adjacent concentric circles and the circle center of the nail plate are arranged in a staggered manner. By means of the method, large-size cracks possibly occurring on the end face of the wood can be decomposed into evenly-distributed tiny cracks, the wood is saved, and the outturn percentage of the wood is increased.

Description

technical field [0001] The present invention relates to a method for preventing severe cracking of wood end faces. Background technique [0002] When the wood dries and shrinks, it will produce dry shrinkage stress, which is combined with the tree growth stress to form a tensile stress perpendicular to the longitudinal direction (axial direction) of the wood. When the tensile stress is greater than the tensile strength of the wood transverse grain, the wood tissue will crack. When the relative humidity of the storage or transportation environment and the moisture content of the wood change, the cracking phenomenon is particularly serious, and the cracking depth (along the longitudinal direction of the wood) can reach more than 50cm, and the utilization rate and yield rate of the wood are significantly reduced. Current anti-cracking methods and measures include two types, one is to use chemical coatings (paraffin, paint, etc.) to brush on the end face of the wood, to close th...

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Problems solved by technology

[0003] There are defects in the two anti-cracking methods: paint brushing method: (1) The agent will soak into the end surface of the wood to a certain depth, causing pollution to the wood. During post-processing, the pollution Part of the wood needs to be sawed off, resulting in waste, (2) the volatilization of the chemical enters the air, polluting the environment, (3) when the temperature is lower than 0 ° C, construction cannot be carried out, (4) when the wood is dried in the drying kiln, the paraffin wax melts and drops Falling, paint denaturation, anti-cracking effect decreased

Nail stripping method: (1) It can only be implemented when cracks appear on the end surface of the wood, and it has no preventive function. (2) It has a certain inhibitory effect on the end of the wood when it is just cracked. As the cracks gradually develop, it loses its protective function. (3) ) during use, the nails need to be fixed on the end face of the wood and cannot be removed, which will increase the production cost

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