Technique and equipment for lowering formaldehyde in procedure for processing lumber-core board

A processing and blockboard technology, applied in wood processing utensils, impregnated wood, manufacturing tools, etc., can solve the problems of low free formaldehyde content, high free formaldehyde release, slow curing speed, etc., to reduce the content of free formaldehyde , The effect of reducing free formaldehyde content and reducing aging time

Inactive Publication Date: 2006-07-05
CHANGLIN WOOD IND
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the free formaldehyde emission of existing urea-formaldehyde resin adhesives is too high, people's usual thinking is to develop adhesives with lower free formaldehyde content, such as the Meibang brand adhesive of the NR123T model, whose free formaldehyde content is 0.10%. The amount is 0.70mg/L
It belongs to the low urea-formaldehyde resin adhesive with low free formaldehyde content and

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Technique and equipment for lowering formaldehyde in procedure for processing lumber-core board

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] In Example 1, the preparation formula of the urea-formaldehyde glue used in the splicing of wooden strips is (weight points): urea-formaldehyde resin 100, filler 20, formaldehyde trapping agent 6, curing agent 0.6; poplar core board is pasted on both sides of the wooden strips after splicing To form the core layer board, the poplar core board's requirements for gluing can be (weight points) urea-formaldehyde resin 100, filler 25, formaldehyde trapping agent 6, curing agent 0.4; the surface board on both surfaces of the core layer board is a three-layer board. The board's requirements for glue coating are: (weight points): urea-formaldehyde resin 100, filler 22, formaldehyde trapping agent 6, curing agent 0.5.

Example Embodiment

[0022] In Example 2, the formula of the urea-formaldehyde coating used in the splicing of wood strips can be (weight minutes): urea-formaldehyde resin 100, filler 23, curing agent 0.8; poplar core board's requirements for glue coating can be (weight minutes) low-formaldehyde urea-formaldehyde Resin 100, filler 28, curing agent 0.50; The requirements for gluing of the surface board are: (weight points): urea-formaldehyde resin 100, filler 25, curing agent 0.50.

Example Embodiment

[0023] In Example 3, the formula of the urea-formaldehyde coating used in the splicing of wooden strips can be (weight points): low-formaldehyde urea-formaldehyde resin 100, filler 27, curing agent 0.9; poplar core board has low requirements for glue coating (weight fraction) Aldehyde urea-formaldehyde resin 100, filler 33, curing agent 0.5; The requirements for gluing of the surface board are: (weight points): low-formaldehyde urea-formaldehyde resin 100, filler 28, curing agent 0.5.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention discloses a formaldehyde-reducing process in the production process of veneered strip-glued board and its equipment. Said equipment mainly includes ventilating ducts and fan, and its formaldehyde-reducing process includes the following steps: spaced stacking the adhesive-coated mechanically-matched or hot-pressed board blanks, making the air inlets of ventilating ducts be positioned at two sides of board blank stack respectively, making the air outlets of ventilating ducts be positioned in the exterior of processing field, under the action of the fan a negative pressure action is formed around the board blank stack, so that the peripheral air of the board blank stack can be led out to the exterior of processing field so as to quickly discharge out free formaldehyde produced in the adhesive-coating process, and effectively prevent the free formaldehyde from being absorbed by board core and finished product board and can reduce formaldehyde content in the product obviously.

Description

technical field [0001] The technical solution of the present invention relates to the technical field of blockboard processing, in particular to the process of removing free formaldehyde in the process of blockboard processing and the equipment used in the process. Background technique [0002] In the existing blockboard processing technology, the processing of blockboard often adopts urea-formaldehyde resin adhesive. The advantages of using urea-formaldehyde resin adhesive are: low cost, high bonding strength, fast curing, and convenient use. However, due to: 1. The addition and polycondensation reaction of urea and formaldehyde in aqueous solution is a reversible reaction, and there will always be free formaldehyde in the glue; 2. There are methylene ether bonds in the resin. Decomposition produces formaldehyde, especially in the presence of moisture in acidic media, it is easier to decompose and release formaldehyde; 3. During the curing process of the resin, ether bonds ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B27M1/08B27K3/12B27K3/36
Inventor 周绍平王厚立张建宏
Owner CHANGLIN WOOD IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap