Production method and manufacturing technology for corn stalk moulded board

A technology of corn stalks and production methods, which is applied in the field of molded board production, can solve the problems of large density deviation, high wet expansion rate, and large energy consumption, and achieve the effects of reducing density deviation, solving high expansion rate, and reducing procedures

CN101898382AInactive Publication Date: 2010-12-01宋庆华
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-12-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a production method and manufacturing technology (attached drawings) for a moulded board from corn stalk serving as raw materials, and mainly solves the problems of energy consumption, three wastes, density, internal bond strength, expansion ratio and formaldehyde release in the prior art. The method is mainly characterized by comprising the following steps of: crushing the raw materials twice to achieve the grain diameter of 1 to 15 mm and the moisture content of 15 percent or below, and determining the apparent density of the raw materials to between 0.09 and 0.13 g / cm<3> after three kinds of size grading; determining the finished product density to between 0.4 and 0.55 g / cm<3> by contrasting the density of wood; solving the compression ratio of 2.5 to 4.5 by using the ratio of two densities; stirring 70 to 80 mass percent of raw materials and 20 to 30 mass percent of adhesive for 10 to 15 minutes, putting into a mould, and performing hot press molding at the temperature of between 135 and 170 DEG C for 25 to 40s / mm under the pressure of between 2.0 and 3.5 MPa. The method has the advantages that: by modifying parameters of a material preparing stage, and transforming crushing, stirring and hot-pressing equipment in the operation process and modifying the hot-pressing technological parameters, the method reduces the density deviation, improves the internal bond strength, reduces the expansion ratio and free formaldehyde release amount and makes physical and mechanical indexes of the finished products exceed the standard of the like products.
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Description

Technical field:

[0001] The invention relates to a method and a manufacturing process for producing molded boards with corn stalks as raw materials. Background technique:

[0002] At present, wood-based panel enterprises mostly produce particleboard, medium and high-density board (fiberboard), and the raw materials of the board are "three leftovers in the forest area, secondary small fuelwood, forest thinning, and bamboo" ① Among them, the production method of particleboard is: chipping the log and breaking it into small pieces of two sizes, thick and thin, respectively sizing glue, admixture, stirring, and selecting the amount of surface fine material and core layer coarse material according to the thickness of the board. ② . Pavement slabs are pre-pressed, hot-pressed, solidified and cooled to form ③ The production method of medium and high-density board (fiberboard) is: soak the log and chip it, and use the hot grinding method to make fibrous materials of different size...

Examples

Embodiment

[0011] Embodiment: making 1300*1300*10mm board

[0012] 1. Parameters of the material preparation section: (1) The moisture content of the raw material is below 20%, the particle size of the rough material is 10-25mm, the particle size of the secondary crushed material is 8-10mm, the content is 20%, the medium material is 5-8mm, the content is 40%, the fine Material 1-5mm, content 40%, apparent density 0.125g / cm 3 . (2) Reference wood apparent density 0.40-0.80g / cm 3 , to obtain the density of the formed board to take 0.50g / cm 3 . (3) Determine the compression ratio: density of finished board ÷ apparent density of raw material = 0.5÷0.125 = 4, determine the thickness of the slab for mold laying, the amount of each board is 8.5kg, and the amount of glue mixed is 20-30%.

[0013] 2. Determine the process parameters during pressing, (1) The pyrolysis temperature of corn stalks is 110-200°C, the curing temperature of the modified urea-formaldehyde resin adhesive is 105-125°C, ...

Embodiment 2

[0014] Embodiment 2, making 130*130*25mm board

[0015] 1. Determine the material preparation parameters: (1) The moisture content of raw materials is 20%, the particle size of coarse grinding is 10-25mm, the particle size of secondary grinding coarse material is 10-15mm20%, the particle size of medium material is 5-10mm30%, and the particle size of fine material is 1- 5mm%, the calculated apparent density of raw materials is 0.115g / cm 3 . (2) Select the density of the forming board to be 0.4g / cm 3 . (3) Calculation of compression ratio=formed plate density÷raw material apparent density=0.40÷0.115=3.4 is taken as 3, and the thickness of the plate is determined. The material used for each plate is 14.5kg, and the amount of adhesive is 30%.

[0016] 2. Determining process parameters: (1) Same as Example 1, pyrolysis temperature 110-200°C, curing temperature of modified urea-formaldehyde resin adhesive 105°C-125°C, pressure 1.2-2.0MPa, time 5-12min. (2) Determine the thermal ...