CN107599094A - A kind of heat pressing process of cottonwood plank stuff - Google Patents
A kind of heat pressing process of cottonwood plank stuff Download PDFInfo
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- CN107599094A CN107599094A CN201710849579.2A CN201710849579A CN107599094A CN 107599094 A CN107599094 A CN 107599094A CN 201710849579 A CN201710849579 A CN 201710849579A CN 107599094 A CN107599094 A CN 107599094A
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- hot pressing
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Abstract
The present invention relates to woodwork processing and fabricating technical field,Disclose a kind of heat pressing process of cottonwood plank stuff,Solves stick curing degree deficiency in existing cottonwood plank stuff hot pressing,It is easily cracking,The quality problems such as deformation,In hot pressing,Under the collective effect of thermograde and barometric gradient,Heat spreads to core area,Migration,So that sheet material obtains enough heats,Top layer moisture content, which properly increases, will accelerate this process,Adhesive can fully be solidified,Plate property is lifted,Steam pressure in the releasable slab of pressure drop stage mode,Effectively prevent that being layered the mass defects such as bubbling produces,Improve board quality,Transmission of the present invention to heat,The control of pressure,The change of moisture content carries out in-depth study,Improve the solidification of adhesive and the bonding strength of sheet material,By to poplar material slab inner core layers temperature change,To hold the quality control in sheet material heat pressing process.
Description
Technical field
The invention belongs to woodwork processing and fabricating technical field, and in particular to a kind of heat pressing process of cottonwood plank stuff.
Background technology
Poplar, also known as " populus simonii ", the normal gloss having as cross-talk, therefore also known as " satin poplar ", often as the attached material of elm furniture
Used with the tire bone of lacquer furniture on ancient furniture.It is the conventional timber of northern China, its matter is soft, and property is steady, cheap and easy to get.Poplar
Wood fiber structure is loose, material is relatively poor, and its application is mainly used as solid wooden compound floor core at present by larger limitation
Plate, building template, bottom plate, short-cycle industrial material material or road, river course green tree species.Willow is due to adaptable strong, raw
The advantages that long fast, trunk is logical straight, volume recovery is high, have become one of big quick-growing plantation seeds in China three, but Fast growth poplar trees
There is also the defects of density is low, material is soft, variability is big, low intensity for material.Therefore, using various technological means modifications
Poplar, to improving poplar performance, expanding poplar application field and improving added value of product, realize that the efficient of Poplar Resource utilizes tool
There is very important realistic meaning.
The content of the invention
The purpose of the present invention is to be directed to the problem of existing, there is provided a kind of heat pressing process of cottonwood plank stuff, to the biography of heat
Pass, the control of pressure, the change of moisture content carry out in-depth study, improve the solidification of adhesive and the bonding strength of sheet material, reach
To the target for shortening pressing cycle, improving production efficiency.
The present invention is achieved by the following technical solutions：
A kind of heat pressing process of cottonwood plank stuff, its process comprise the following steps：
（1）By the poplar natural drying 2-3 newly cut down months, be processed into needed for shape sheet material, using bleaching liquid at 65-70 DEG C
Lower bleaching 30-40 minutes, carbonization treatment, steam pressure 0.25-0.30MPa, temperature are carried out after bleaching by the way of boiling
110-120 DEG C, the time be 1.5-2.0 hours；
（2）Sheet material after carbonization treatment is dried, and first time drying temperature is 80-90 DEG C, and it is 6%- to dry to sheet material moisture content
8%, lower progress impregnation is incubated, is solidified using the phenolic acid Resin adhesive of methylol modified nylon, modified alkyd resin glue sticks
Agent is diluted through 4-5 times of water, stirs, and adhesive dosage is 8%-10%, and reducing temperature twice drying is carried out after solidification：Temperature 50-60
DEG C, it is 10%-12% to control sheet material moisture content；
（3）Hot pressing, hot pressing pressure 4.5-5.0MPa are carried out after redrying, hot pressing temperature is 145-155 DEG C, hot pressing time root
Determine according to sheet metal thickness, according to：Hot pressing time=1.0（min）+1.1（min/mm）× thickness（mm）Perform, hot pressing terminates
Afterwards, 3 sections of decompressions are divided, first paragraph is depressurized to 2.5-3.0MPa, and second segment is depressurized to 1.5-2.0MPa, and the 3rd section is depressurized to 0.8-
1.0MPa, air drying is carried out after ejecting plate.
Further described as to such scheme, step（1）Described in bleaching liquid according to mass percent meter contain with
Lower composition：Hydrogen peroxide accounts for 4.5-5.5%, sodium hypochlorite accounts for 3.5-4.5%, calcium hypochlorite accounts for 2.5-3.0%, mass concentration 15-
18% hydrochloric acid accounts for 1.5-2.0%, remaining as water.
Further described as to such scheme, step（2）Described in the phenolic acid tree using methylol modified nylon
Fat adhesive is made up of following component in parts by weight：Ammonia phenolic resin accounts for 20-30 parts, methylol nylon 8 0-90 parts, ethanol
260-280 parts.
Further described as to such scheme, step（3）In middle hot pressing：It is 50-60 DEG C to enter plate temperature, ejecting plate
40-50 DEG C of temperature.
The present invention has advantages below compared with prior art：For bad, the processing efficiency that solves existing cotton wood performance
Low, ropy problem, the invention provides a kind of heat pressing process of cottonwood plank stuff, solves existing cottonwood plank stuff hot pressing
The quality problems such as middle stick curing degree deficiency, easily cracking, deformation, in hot pressing, in thermograde and pressure ladder
Under the collective effect of degree, heat spreads to core area, migration, so that sheet material obtains enough heats, top layer moisture content is appropriate
Raising will accelerate this process, and adhesive can fully be solidified, plate property lifting, the releasable slab of pressure drop stage mode
In steam pressure, effectively prevent that being layered the mass defect such as bubbling produces, improve board quality, transmission of the present invention to heat,
The control of pressure, the change of moisture content carry out in-depth study, the solidification of adhesive and the bonding strength of sheet material are improved, by right
Poplar material slab inner core layers temperature change, to hold the quality control in sheet material heat pressing process.
Embodiment
With reference to specific embodiment, the present invention will be further described.
Embodiment 1
A kind of heat pressing process of cottonwood plank stuff, its process comprise the following steps：
（1）By the poplar natural drying newly cut down 2 months, be processed into needed for shape sheet material, floated using bleaching liquid at 65 DEG C
White 30 minutes, carbonization treatment is carried out after bleaching by the way of boiling, steam pressure 0.25MPa, 110 DEG C of temperature, time is
1.5 hour；
（2）Sheet material after carbonization treatment is dried, and first time drying temperature is 80 DEG C, and it is 6% to dry to sheet material moisture content, is protected
Temperature is lower to carry out impregnation, is solidified using the phenolic acid Resin adhesive of methylol modified nylon, modified phenolic resin adhesive is through 4
The dilution of times water, is stirred, and adhesive dosage is 8%, and reducing temperature twice drying is carried out after solidification：Temperature 50 C, control sheet material are aqueous
Rate is 10%；
（3）Hot pressing, hot pressing pressure 4.5MPa are carried out after redrying, hot pressing temperature is 145-155 DEG C, and hot pressing time is according to plate
Material thickness is determined, according to：Hot pressing time=1.0（min）+1.1（min/mm）× thickness（mm）Perform, after hot pressing terminates, point
3 sections of decompressions, first paragraph are depressurized to 2.5MPa, and second segment is depressurized to 1.5MPa, and the 3rd section is depressurized to 0.8MPa, is carried out after ejecting plate normal
Temperature is dried.
Further described as to such scheme, step（1）Described in bleaching liquid according to mass percent meter contain with
Lower composition：Hydrogen peroxide account for 4.5%, sodium hypochlorite account for 3.5%, calcium hypochlorite account for the hydrochloric acid that 2.5%, mass concentration is 15% account for 1.5%,
Remaining as water.
Further described as to such scheme, step（2）Described in the phenolic acid tree using methylol modified nylon
Fat adhesive is made up of following component in parts by weight：Ammonia phenolic resin account for 20 parts, 0 part of methylol nylon 8,260 parts of ethanol.
Further described as to such scheme, step（3）In middle hot pressing：It is 50 DEG C to enter plate temperature, ejecting plate temperature
40 DEG C of degree.
Embodiment 2
A kind of heat pressing process of cottonwood plank stuff, its process comprise the following steps：
（1）By the poplar natural drying newly cut down 2.5 months, be processed into needed for shape sheet material, using bleaching liquid at 68 DEG C
Bleaching 35 minutes, carries out carbonization treatment, steam pressure 0.28MPa, 115 DEG C of temperature, time by the way of boiling after bleaching
For 1.8 hours；
（2）Sheet material after carbonization treatment is dried, and first time drying temperature is 85 DEG C, and it is 7% to dry to sheet material moisture content, is protected
Temperature is lower to carry out impregnation, is solidified using the phenolic acid Resin adhesive of methylol modified nylon, modified phenolic resin adhesive warp
4.5 times of water dilutions, stir, and adhesive dosage is 9%, and reducing temperature twice drying is carried out after solidification：55 DEG C of temperature, control sheet material
Moisture content is 11%；
（3）Hot pressing, hot pressing pressure 4.8MPa are carried out after redrying, hot pressing temperature is 150 DEG C, and hot pressing time is thick according to sheet material
Du Laiding, according to：Hot pressing time=1.0（min）+1.1（min/mm）× thickness（mm）Perform, after hot pressing terminates, divide 3 sections
Decompression, first paragraph are depressurized to 2.8MPa, and second segment is depressurized to 1.8MPa, and the 3rd section is depressurized to 0.9MPa, and normal temperature is carried out after ejecting plate
Drying.
Further described as to such scheme, step（1）Described in bleaching liquid according to mass percent meter contain with
Lower composition：Hydrogen peroxide account for 5.0%, sodium hypochlorite account for 4.0%, calcium hypochlorite account for the hydrochloric acid that 2.8%, mass concentration is 16% account for 1.8%,
Remaining as water.
Further described as to such scheme, step（2）Described in the phenolic acid tree using methylol modified nylon
Fat adhesive is made up of following component in parts by weight：Ammonia phenolic resin account for 25 parts, 5 parts of methylol nylon 8,270 parts of ethanol.
Further described as to such scheme, step（3）In middle hot pressing：It is 55 DEG C to enter plate temperature, ejecting plate temperature
45 DEG C of degree.
Embodiment 3
A kind of heat pressing process of cottonwood plank stuff, its process comprise the following steps：
（1）By the poplar natural drying newly cut down 3 months, be processed into needed for shape sheet material, floated using bleaching liquid at 70 DEG C
White 40 minutes, carbonization treatment is carried out after bleaching by the way of boiling, steam pressure 0.30MPa, 120 DEG C of temperature, time is
2.0 hour；
（2）Sheet material after carbonization treatment is dried, and first time drying temperature is 90 DEG C, and it is 8% to dry to sheet material moisture content, is protected
Temperature is lower to carry out impregnation, is solidified using the phenolic acid Resin adhesive of methylol modified nylon, modified phenolic resin adhesive is through 5
The dilution of times water, is stirred, and adhesive dosage is 10%, and reducing temperature twice drying is carried out after solidification：Temperature 60 C, control sheet material contain
Water rate is 12%；
（3）Hot pressing, hot pressing pressure 5.0MPa are carried out after redrying, hot pressing temperature is 155 DEG C, and hot pressing time is thick according to sheet material
Du Laiding, according to：Hot pressing time=1.0（min）+1.1（min/mm）× thickness（mm）Perform, after hot pressing terminates, divide 3 sections
Decompression, first paragraph are depressurized to 3.0MPa, and second segment is depressurized to 2.0MPa, and the 3rd section is depressurized to 1.0MPa, and normal temperature is carried out after ejecting plate
Drying.
Further described as to such scheme, step（1）Described in bleaching liquid according to mass percent meter contain with
Lower composition：Hydrogen peroxide account for 5.5%, sodium hypochlorite account for 4.5%, calcium hypochlorite account for the hydrochloric acid that 3.0%, mass concentration is 18% account for 2.0%,
Remaining as water.
Further described as to such scheme, step（2）Described in the phenolic acid tree using methylol modified nylon
Fat adhesive is made up of following component in parts by weight：Ammonia phenolic resin account for 30 parts, 0 part of methylol nylon 9,280 parts of ethanol.
Further described as to such scheme, step（3）In middle hot pressing：It is 60 DEG C to enter plate temperature, ejecting plate temperature
50 DEG C of degree.
Comparative example 1
With differing only in for embodiment 1, step（1）Steam pressure is 0.20MPa, 100 DEG C of temperature, time in middle carbonization treatment
For 1.5 hours, remaining holding was constant.
Comparative example 2
With differing only in for embodiment 2, step（2）It is middle to be solidified using conventional phenolic resin adhesive, remaining holding
It is constant.
Comparative example 3
With differing only in for embodiment 3, step（3）Middle hot pressing pressure is 5.5MPa, and hot pressing temperature is 160 DEG C, and hot pressing terminates
Latter step decompression, remaining holding are constant.
Contrast test
The hot-pressing processing of poplar is carried out using embodiment 1-3 and comparative example 1-3 technique respectively, and with existing hot-pressing processing side
As a control group, the timber of processing is with a collection of to method, and irrelevant variable is consistent, the performance of measure record cottonwood plank stuff, result is remembered
Record as shown in the table：
As can be seen here, transmission, the control of pressure, the change of moisture content of the present invention to heat carries out in-depth study, improves glue
The solidification of stick and the bonding strength of sheet material, by poplar material slab inner core layers temperature change, to hold sheet material hot pressing work
Quality control in skill.
Claims (4)
1. a kind of heat pressing process of cottonwood plank stuff, it is characterised in that its process comprises the following steps：
（1）By the poplar natural drying 2-3 newly cut down months, be processed into needed for shape sheet material, using bleaching liquid at 65-70 DEG C
Lower bleaching 30-40 minutes, carbonization treatment, steam pressure 0.25-0.30MPa, temperature are carried out after bleaching by the way of boiling
110-120 DEG C, the time be 1.5-2.0 hours；
（2）Sheet material after carbonization treatment is dried, and first time drying temperature is 80-90 DEG C, and it is 6%- to dry to sheet material moisture content
8%, lower progress impregnation is incubated, is solidified using the phenolic acid Resin adhesive of methylol modified nylon, modified alkyd resin glue sticks
Agent is diluted through 4-5 times of water, stirs, and adhesive dosage is 8%-10%, and reducing temperature twice drying is carried out after solidification：Temperature 50-60
DEG C, it is 10%-12% to control sheet material moisture content；
（3）Hot pressing, hot pressing pressure 4.5-5.0MPa are carried out after redrying, hot pressing temperature is 145-155 DEG C, hot pressing time root
Determine according to sheet metal thickness, according to：Hot pressing time=1.0（min）+1.1（min/mm）× thickness（mm）Perform, hot pressing terminates
Afterwards, 3 sections of decompressions are divided, first paragraph is depressurized to 2.5-3.0MPa, and second segment is depressurized to 1.5-2.0MPa, and the 3rd section is depressurized to 0.8-
1.0MPa, air drying is carried out after ejecting plate.
A kind of 2. heat pressing process of cottonwood plank stuff as claimed in claim 1, it is characterised in that step（1）Described in bleaching liquid press
Contain following component according to mass percent meter：Hydrogen peroxide accounts for 4.5-5.5%, sodium hypochlorite accounts for 3.5-4.5%, calcium hypochlorite accounts for 2.5-
3.0%th, mass concentration is that 15-18% hydrochloric acid accounts for 1.5-2.0%, remaining as water.
A kind of 3. heat pressing process of cottonwood plank stuff as claimed in claim 1, it is characterised in that step（2）Described in use hydroxyl
The phenolic acid Resin adhesive of methyl modified nylon is made up of following component in parts by weight：Ammonia phenolic resin accounts for 20-30 parts, hydroxyl
Methyl nylon 8 0-90 parts, ethanol 260-280 parts.
A kind of 4. heat pressing process of cottonwood plank stuff as claimed in claim 1, it is characterised in that step（3）In middle hot pressing：Enter
Plate temperature is 50-60 DEG C, 40-50 DEG C of die temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710849579.2A CN107599094A (en) | 2017-09-20 | 2017-09-20 | A kind of heat pressing process of cottonwood plank stuff |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710849579.2A CN107599094A (en) | 2017-09-20 | 2017-09-20 | A kind of heat pressing process of cottonwood plank stuff |
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| CN107599094A true CN107599094A (en) | 2018-01-19 |
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| CN101323128A (en) * | 2008-06-16 | 2008-12-17 | 南京林业大学 | Method for producing wood composite floor heating floorboard |
| WO2008155466A1 (en) * | 2007-06-19 | 2008-12-24 | Stora Enso Oyj | Surface treatment of thermally modified wood |
| CN102107452A (en) * | 2009-12-26 | 2011-06-29 | 浙江世友木业有限公司 | Cork solid wood flooring and manufacturing method thereof |
| CN103231427A (en) * | 2013-05-08 | 2013-08-07 | 国家林业局泡桐研究开发中心 | Method for manufacturing high-density board by using soft fast-growing forest trees |
| CN103831883A (en) * | 2012-11-23 | 2014-06-04 | 王大应 | Method for improving strength and eradicating crack of soft wooden material |
| CN105196367A (en) * | 2015-08-28 | 2015-12-30 | 合肥市科天化工有限公司 | Production technology of water-based zero-formaldehyde multiply plywood |
-
2017
- 2017-09-20 CN CN201710849579.2A patent/CN107599094A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008155466A1 (en) * | 2007-06-19 | 2008-12-24 | Stora Enso Oyj | Surface treatment of thermally modified wood |
| CN101323128A (en) * | 2008-06-16 | 2008-12-17 | 南京林业大学 | Method for producing wood composite floor heating floorboard |
| CN102107452A (en) * | 2009-12-26 | 2011-06-29 | 浙江世友木业有限公司 | Cork solid wood flooring and manufacturing method thereof |
| CN103831883A (en) * | 2012-11-23 | 2014-06-04 | 王大应 | Method for improving strength and eradicating crack of soft wooden material |
| CN103231427A (en) * | 2013-05-08 | 2013-08-07 | 国家林业局泡桐研究开发中心 | Method for manufacturing high-density board by using soft fast-growing forest trees |
| CN105196367A (en) * | 2015-08-28 | 2015-12-30 | 合肥市科天化工有限公司 | Production technology of water-based zero-formaldehyde multiply plywood |
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| 张志冬: "《胶接原理与实用胶接配方600种》", 31 October 1985 * |
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Application publication date: 20180119 |