CN1044791C - Method for reducing formaldhyde diffusion from fibreboard by vacuum treatment method - Google Patents
Method for reducing formaldhyde diffusion from fibreboard by vacuum treatment method Download PDFInfo
- Publication number
- CN1044791C CN1044791C CN95111142A CN95111142A CN1044791C CN 1044791 C CN1044791 C CN 1044791C CN 95111142 A CN95111142 A CN 95111142A CN 95111142 A CN95111142 A CN 95111142A CN 1044791 C CN1044791 C CN 1044791C
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- Prior art keywords
- vacuum
- boards
- tank
- reducing
- formaldhyde
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Abstract
The present invention relates to a method-vacuum treatment method for reducing formaldehyde radiation amount of artificial boards which comprise veneer boards, shaving boards or medium density fiber boards, which is characterized in that the artificial boards are pushed into a vacuum tank in stacks after being thermally pressed, the temperature in the tank is maintained about 40 DEG C, and the tank is pumped into a vacuum state by a vacuum pump and is maintained for a period of time. After the boards are processed by adopting the method, the formaldehyde radiation amount of the boards can be reduced by 20%.
Description
The present invention relates to a kind of method that reduces the artificial board formaldehyde emission---vacuum processing method.
In the method for the reduction artificial board formaldehyde emission of having made public, mainly comprise chemical treatment method and physical treatment method two big classes, as reducing the adhesive mol ratio; In adhesive, add formaldehyde catching agent; Production board after the hot pressing is carried out chemical liquids spray processing; To becoming plate to carry out edge sealing, veneer processing etc., but there is the processing cost height in most methods, is difficult to realize weak points such as suitability for industrialized production or treatment effect be not ideal enough.
The objective of the invention is to avoid above-mentioned the deficiencies in the prior art part and provide a kind of, discharge outside the plate, thereby reach the purpose that reduces the artificial board formaldehyde emission by plate external and internal pressure official post free formaldehyde by wood-based plate is placed in the vacuum tank.
Purpose of the present invention can reach by following measure:
A kind of method with application of vacuum reduction artificial board formaldehyde emission is characterized in that after wood-based plate is finished hot pressing plank being placed vacuum tank, keeps jar interior temperature between 35 ℃-45 ℃, will be evacuated in the jar with vavuum pump, and vacuum is P=6.27 * 10
4Pa-6.93 * 10
4Pa, and kept 30-40 minute.
The present invention has following advantage compared to existing technology:
The present invention is simple to operate, and cost is low, and effect is obvious, when reducing the plank formaldehyde emission, the mechanical strength of plank is not had a negative impact.
Fig. 1 is a vacuum treatment device schematic diagram of the present invention.
Provide embodiments of the invention below in conjunction with accompanying drawing:
After glued board, particieboard or medium density fibre board (MDF) 3 (with Lauxite as adhesive) are finished operations such as hot pressing cutting edge, stacking also pushes it in cylindrical vacuum tank 1, make a jar interior temperature remain on 40 ℃ by heating tube 2, with vavuum pump 4 with (vacuum P=6.6 * 10 that are evacuated in the jar
4Pa), kept 30 minutes.Method with invention can make the formaldehyde emission amount of plank reduce about 20%, but the quality index such as MOR, elastic modelling quantity and internal bond strength of plank are not had influence.
Claims (3)
1. method that reduces the artificial board formaldehyde emission with application of vacuum, it is characterized in that after wood-based plate is finished hot pressing, plank being placed vacuum tank, keep jar interior temperature between 35 ℃-45 ℃, to be evacuated in the jar with vavuum pump, vacuum is P=6.27 * 10
4Pa-6.93 * 10
4Pa, and kept 30-40 minute.
2. the method with application of vacuum reduction artificial board formaldehyde emission according to claim 1 is characterized in that temperature is 40 ℃ in the vacuum tank, vacuum P=6.6 * 10
4Pa.
3. the method with application of vacuum reduction artificial board formaldehyde emission according to claim 1 and 2 is characterized in that vacuum tank is cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95111142A CN1044791C (en) | 1995-08-07 | 1995-08-07 | Method for reducing formaldhyde diffusion from fibreboard by vacuum treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95111142A CN1044791C (en) | 1995-08-07 | 1995-08-07 | Method for reducing formaldhyde diffusion from fibreboard by vacuum treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1128695A CN1128695A (en) | 1996-08-14 |
| CN1044791C true CN1044791C (en) | 1999-08-25 |
Family
ID=5078455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95111142A Expired - Fee Related CN1044791C (en) | 1995-08-07 | 1995-08-07 | Method for reducing formaldhyde diffusion from fibreboard by vacuum treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1044791C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE349306T1 (en) * | 2001-05-03 | 2007-01-15 | Kronospan Tech Co Ltd | METHOD FOR REDUCING THE FORMALDEHYDE CONTENT AND FORMALDEHYDE LOSS OF CHIPBOARD |
| CN103612295A (en) * | 2013-12-05 | 2014-03-05 | 南京林业大学 | Method of manufacturing aldehyde-free plywood through cellulose modified soybean gum |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1099237A (en) * | 1993-08-25 | 1995-03-01 | 张醒义 | Lotus nutrient solution |
-
1995
- 1995-08-07 CN CN95111142A patent/CN1044791C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1099237A (en) * | 1993-08-25 | 1995-03-01 | 张醒义 | Lotus nutrient solution |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1128695A (en) | 1996-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |