Preparation process of low-odor fiberboard

Abstract

The invention belongs to the technical field of artificial boards, and relates to a preparation process of a low-odor fiberboard, which comprises the procedures of wood storage, wood peeling, chipping, screening, water washing, pre-cooking, cooking, hot grinding, sizing, fiber drying, paving, pre-pressing, hot pressing, cooling, sanding, curing and the like, the adhesive is common urea-formaldehyde resin, the application amount of the adhesive is conventional, the adhesive is firstly pumped into the middle storage tank before use, the deodorant is added into the middle storage tank according to the proportion, and the deodorant is used after being stirred for 30-60 min; the deodorant is arginine modified chitosan quaternary ammonium salt, and the addition amount is 5-15 kg / m < 3 >; in the curing process, a deodorant aqueous solution is sprayed on the surface of the sanded fiberboard, and then the fiberboard is stacked for 1-3 months. By using the deodorant and a matched production process, the low-odor fiberboard is produced, and the odor problem of the fiberboard is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial boards, relates to the preparation of fiberboards, and particularly relates to a preparation process of low-odor fiberboards. Background Art

[0002] China is a major producer and consumer of man-made panels in the world. Fiberboard is one of the three major types of man-made panels in China. Due to its good physical and mechanical properties and processing performance, it is widely used in building decoration, furniture, flooring, doors and windows, and packaging materials. However, the odor problem of wooden furniture made of fiberboard and other man-made panels has become one of the main complaints of consumers.

[0003] Based on the above situation, the present invention discloses a preparation process of a low-odor fiberboard. According to the test of LY / T3236-2020 "Odor Grading and Evaluation Method of Artificial Boards and Their Products", the odor level is ≤ level 2, which is a low-odor fiberboard. The board can be used for interior decoration to solve the odor problem of fiberboard, thereby reducing complaints caused by the odor problem of wooden furniture. Summary of the invention

[0004] In order to improve the technical problem of strong odor of fiberboard, the present invention discloses a preparation process of low-odor fiberboard.

[0005] Technical Solution

[0006] A preparation process of low-odor fiberboard, including: wood storage → wood peeling → chipping → screening → water washing → pre-cooking → cooking → hot grinding → gluing → fiber drying → laying → pre-pressing → hot pressing → cooling → sanding → curing and other processes, wherein:

[0007] In the wood storage process, the wood is poplar or eucalyptus, the storage time is 1 to 3 months, preferably 2 months, and the storage condition is a season with a temperature of 25°C or above, preferably 25 to 35°C during the day and no rain most of the time;

[0008] In the sizing process, the adhesive is ordinary urea-formaldehyde resin, and the conventional application amount is first injected into the intermediate storage tank before use, and the deodorant is added to the intermediate storage tank according to the proportion, and stirred for 30 to 60 minutes before use; the deodorant is arginine-modified chitosan quaternary ammonium salt, and the addition amount is 5 to 15 kg / m 3 Preferably 10kg / m 3 , provided by the Research Institute of Wood Industry, Chinese Academy of Forestry;

[0009] In the hot pressing process, the continuous press adopts five-stage temperature and pressure zone control, the temperature of the five zones is 2-5°C lower than that of the conventional urea-formaldehyde resin board, preferably 3°C, and the press speed is reduced by 5-10% and preferably 8% compared with the conventional urea-formaldehyde resin board process;

[0010] In the curing process, the sanded fiberboard surface is sprayed with the deodorant aqueous solution and then stacked for 1 to 3 months, with a spraying amount of 10 to 200 g / m 2 , preferably 100g / m 2 .

[0011] According to a preferred disclosed example of the present invention, in the gluing process, the intermediate tank continues to stir, and the stirring speed is maintained at 100 to 500 r / min until the adhesive is used up.

[0012] According to a preferred embodiment of the present invention, in the health-preserving process, the concentration of the flavoring agent aqueous solution is 1-20wt.% of arginine-modified chitosan quaternary ammonium salt aqueous solution, preferably 10wt.%.

[0013] The low-odor fiberboard prepared by the present invention uses poplar or eucalyptus as wood raw material, uses urea-formaldehyde resin as adhesive, and adopts a specific production process. The fiberboard produced is a low-odor fiberboard. According to LY / T3236-2020 "Odor Classification and Evaluation Method of Artificial Boards and Their Products", the odor level is ≤ level 2.

[0014] In order to solve the odor problem of ordinary fiberboard, the present invention adopts a single tree species of poplar or eucalyptus as the wood raw material. The single tree species solves the problem of complex and changeable VOCs components of wood, so that the type of odor can be stably controlled; the wood storage condition is above 25 degrees during the day and most of the time it is not raining season, which is beneficial to the release of odor substances in the wood itself on the one hand, and on the other hand, storage in a high temperature and dry environment is beneficial to the evaporation of wood moisture, thereby reducing the moisture content of the wood, which can reduce the fiber drying temperature, thereby reducing the volatilization of the deodorant caused by high temperature; in the gluing process, the deodorant is added to the adhesive, and the deodorant is evenly applied to the fiber along with the adhesive. This application method will wrap the deodorant in the adhesive to form a microcapsule structure, which greatly reduces the deodorant in the drying process. volatilization increases the reaction rate of the deodorant and the odor compounds; the hot pressing temperature is 2-5°C lower than that of ordinary urea-formaldehyde resin boards, and the pressing machine speed is reduced by 5-10% compared with ordinary urea-formaldehyde resin board processes. The technical means of lowering the temperature and increasing the hot pressing time are adopted. Under high temperature conditions, the hot pressing time is extended, which is conducive to the release of odor compounds and at the same time increases the reaction rate of the odor compounds and the deodorant; in the curing process, the surface of the sanded fiberboard is sprayed with water and then stacked for 1-3 months, an appropriate amount of arginine-modified chitosan quaternary ammonium salt is added to the water, and the surface is sprayed with water and stacked. The volatilization of water can take away some of the odor compounds, and the deodorant is added to the water. After the water evaporates, the deodorant can remain on the surface of the board to the core layer 0.1-0.5mm, and can block and absorb some of the odor compounds during use.

[0015] Beneficial Effects

[0016] The invention solves the odor problem of the fiberboard by producing a low-odor fiberboard using a deodorant and a matching production process. DETAILED DESCRIPTION

[0017] The present invention is described in detail below in conjunction with the embodiments so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following embodiments.

[0018] Example 1

[0019] A 10mm low-odor fiberboard production process comprises the following steps: wood storage → wood peeling → chipping → screening → water washing → pre-cooking → cooking → hot grinding → gluing → fiber drying → paving → pre-pressing → hot pressing → cooling → sanding → curing, to obtain a finished board.

[0020] In the wood storage process, the wood type is eucalyptus, the storage time is 2 months, and the storage conditions are above 25 degrees during the day and it is not raining most of the time;

[0021] In the gluing process, the adhesive is urea-formaldehyde resin. Before use, the adhesive is first pumped into an intermediate storage tank, and the deodorizer is added to the intermediate storage tank according to a proportion and stirred for 30 to 60 minutes before use. During the gluing process, the intermediate tank continues to stir; the stirring speed of the intermediate tank is maintained at 100 to 500 r / min until the adhesive is used up.

[0022] The deodorant is arginine modified chitosan quaternary ammonium salt, and the addition amount is 10kg / m 3 , provided by the Research Institute of Wood Industry, Chinese Academy of Forestry.

[0023] In the hot pressing process, the continuous press adopts five-stage temperature and pressure zone control, the temperatures of the five zones are 2-5°C lower than those of ordinary urea-formaldehyde resin boards, and the press speed is reduced by 5-10% compared with ordinary urea-formaldehyde resin boards.

[0024] In the curing process, the sanded fiberboard surface is sprayed with water and then stacked for 3 months, with a water spraying amount of 80g / m 2 , add an appropriate amount of arginine-modified chitosan quaternary ammonium salt into the water, the addition amount is 10%.

[0025] The finished board 1 was tested and the odor level was 2.

[0026] Example 2

[0027] A 12mm low-odor fiberboard production process comprises the following steps: wood storage → wood peeling → chipping → screening → water washing → pre-cooking → cooking → hot grinding → gluing → fiber drying → paving → pre-pressing → hot pressing → cooling → sanding → curing, to obtain a finished board.

[0028] In the wood storage process, the wood type is poplar, the storage time is 3 months, and the storage conditions are above 25 degrees during the day and it is not raining most of the time;

[0029] In the gluing process, the adhesive is urea-formaldehyde resin. Before use, the adhesive is first pumped into an intermediate storage tank, and the deodorizer is added to the intermediate storage tank according to a proportion and stirred for 30 to 60 minutes before use. During the gluing process, the intermediate tank continues to stir; the stirring speed of the intermediate tank is maintained at 100 to 500 r / min until the adhesive is used up.

[0030] The deodorant is arginine modified chitosan quaternary ammonium salt, and the addition amount is 8kg / m 3 , provided by the Research Institute of Wood Industry, Chinese Academy of Forestry.

[0031] In the hot pressing process, the continuous press adopts five-stage temperature and pressure zone control, the temperatures of the five zones are 2-5°C lower than those of ordinary urea-formaldehyde resin boards, and the press speed is reduced by 5-10% compared with ordinary urea-formaldehyde resin boards.

[0032] In the curing process, the sanded fiberboard surface is sprayed with water and then stacked for 3 months, with a water spraying amount of 100g / m 2 , add an appropriate amount of arginine-modified chitosan quaternary ammonium salt into the water, the addition amount is 10%.

[0033] The finished board 2 was tested and found to have an odor level of 2.

[0034] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the specification of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A process for preparing a low-odor fiberboard, comprising: Wood storage → wood peeling → chipping → screening → washing → pre-cooking → cooking → hot grinding → gluing → fiber drying → laying → pre-pressing → hot pressing → cooling → sanding → curing and other processes, characterized by: In the wood storage process, the wood is poplar or eucalyptus, the storage time is 1 to 3 months, and the storage condition is a season with a temperature above 25°C during the day and no rain most of the time; In the sizing process, the adhesive is ordinary urea-formaldehyde resin, and the conventional application amount is first injected into the intermediate storage tank before use, and the deodorant is added to the intermediate storage tank according to the proportion, and stirred for 30 to 60 minutes before use; the deodorant is arginine-modified chitosan quaternary ammonium salt, and the addition amount is 5 to 15 kg / m 3 ; In the hot pressing process, the continuous press adopts five-stage temperature and pressure zone control, the temperature of the five zones is 2-5°C lower than that of conventional urea-formaldehyde resin boards, and the press speed is reduced by 5-10% compared with the conventional urea-formaldehyde resin board process; In the curing process, the sanded fiberboard surface is sprayed with the deodorant aqueous solution and then stacked for 1 to 3 months, with a spraying amount of 10 to 200 g / m 2 .

2. The process for preparing the low-odor fiberboard according to claim 1, characterized in that: In the wood storage process, the storage time is 2 months, and the storage condition is a season with a daytime temperature of 25 to 35° C. and no rain most of the time.

3. The process for preparing the low-odor fiberboard according to claim 1, characterized in that: In the sizing process, the addition amount is 10 kg / m 3 .

4. The process for preparing the low-odor fiberboard according to claim 1, characterized in that: During the gluing process, the intermediate tank continues to stir, and the stirring speed is maintained at 100-500r / min until the adhesive is used up.

5. The process for preparing the low-odor fiberboard according to claim 1, characterized in that: In the hot pressing process, the temperatures of the five zones are 3°C lower than those of conventional urea-formaldehyde resin boards, and the pressing speed is reduced by 8% compared with conventional urea-formaldehyde resin board processes.

6. The process for preparing the low-odor fiberboard according to claim 1, characterized in that: In the curing process, the spraying amount is 100 g / m 2 .

7. The process for preparing the low-odor fiberboard according to claim 1, characterized in that: The concentration of the deodorant aqueous solution is 1-20 wt.% of an arginine-modified chitosan quaternary ammonium salt aqueous solution.

8. The process for preparing the low-odor fiberboard according to claim 1, characterized in that: The deodorant aqueous solution has a concentration of 10 wt.% of arginine-modified chitosan quaternary ammonium salt aqueous solution.

9. A low-odor fiberboard prepared according to the process of any one of claims 1 to 8.

10. The low-odor fiberboard according to claim 9, characterized in that: According to the test of LY / T 3236-2020 "Odor Classification and Evaluation Methods of Artificial Boards and Their Products", the odor level is ≤ Level 2.