Production method of medium-density fiberboard using waste and old wood

Abstract

The invention relates to a method for producing medium density fibre boards by utilizing waste wood. The method comprises: waste materials are smashed, processed by steam stewing for softening in a stewing tank, then sent to the millstone cavity of a thermofiner for processing by defibrator process to be fibre-shaped wood pulp, the fibre-shaped wood pulp is in a discharge pulp pipe and sent to a tube-typed drier for carrying out airflow drying process by applying glue by a rubber pipe and relying on steam pressure, and then is sent into a pressing machine for hot press molding after being paved by a paver. The method is characterized in that: the waste materials are wood sections containing steel nails and waste furniture boards, the smashing process comprises: a rolling press is adopted for squeezing, kneading and cutting the waste materials, then the waste materials are impacted by a hammer-typed crusher, thus facilitating the wood materials to be crushed into debris and the impurities in the wood materials to be loose and the steel nails to be separated; the crushed materials are screened by a vibration screen for wiping off small sand, stones and dust impurities; iron type metal grains are wiped off in a magnetic separator, suspending and sorting relying on airflow are carried out in a sorter for wiping off the impurities such as sandstones and non-iron metals. By adopting the production method, the waste furniture and the wood sections containing steel nails can be utilized by removing impurity.

Description

technical field [0001] The invention belongs to the technical field of medium-density fiberboard manufacturing, and in particular relates to a production method of using waste wood to prepare medium-density fiberboard. Background technique [0002] At present, the raw materials for manufacturing medium density fiberboard are mainly branch wood, scraps produced by various wood boards in the furniture production process, etc. These waste materials are cut and crushed and then made into medium density fiberboard through related production processes. For example, the invention patent of "a production method for regenerated medium-density fiberboard" (patent number: 200310111863.8) was applied and disclosed by the patent brancher in the early stage. Glue mixing, paving, pre-pressing, hot-pressing, sawing, sanding, and finished products. The raw materials for production are MDF scraps. The Chinese invention patent once also disclosed a technical scheme called "Method for Preparin...

AI Technical Summary

Problems solved by technology

Due to the very limited leftover materials produced by various wood boards in the production process of branch wood and furniture, the production scale is limited. At present, a large number of wood segments containing iron nails and waste furniture boards are not effective because they contain more impurities such as metals and sand. The method to remove impurities has not been rationally utilized, resulting in a lot of waste of raw materials

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