CN108908593B - Pretreatment method for peeling fast-growing poplar - Google Patents
Pretreatment method for peeling fast-growing poplar Download PDFInfo
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- CN108908593B CN108908593B CN201810870183.0A CN201810870183A CN108908593B CN 108908593 B CN108908593 B CN 108908593B CN 201810870183 A CN201810870183 A CN 201810870183A CN 108908593 B CN108908593 B CN 108908593B
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- poplar
- raw material
- corn starch
- fast
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- 241000219000 Populus Species 0.000 title claims abstract description 63
- 238000002203 pretreatment Methods 0.000 title claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 35
- 229920002472 Starch Polymers 0.000 claims abstract description 23
- 235000019698 starch Nutrition 0.000 claims abstract description 23
- 239000008107 starch Substances 0.000 claims abstract description 23
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 8
- 230000001678 irradiating effect Effects 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 6
- 229920002261 Corn starch Polymers 0.000 claims description 34
- 239000008120 corn starch Substances 0.000 claims description 34
- 239000000243 solution Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 235000021355 Stearic acid Nutrition 0.000 claims description 11
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 11
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 11
- 239000008117 stearic acid Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 10
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000008096 xylene Substances 0.000 claims description 6
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 229910052740 iodine Inorganic materials 0.000 claims description 5
- 239000011630 iodine Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000007127 saponification reaction Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 abstract description 11
- 238000010008 shearing Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 230000037303 wrinkles Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves
- B27K5/0055—Radio-waves, e.g. microwaves
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Paper (AREA)
Abstract
The invention belongs to the technical field of poplar processing, and particularly relates to a pretreatment method for peeling fast-growing poplar, which comprises the steps of soaking a poplar raw material in a starch solution for ultrasonic treatment, irradiating by ultraviolet light, and treating for 5-25 minutes under the condition that the pressure is 40-60 MPa. Compared with the prior art, the invention has the following advantages: the invention utilizes the starch solution to bond the starch solution with the poplar bark together under the ultrasonic frequency condition, then irradiates by ultraviolet lamp to age and wrinkle the starch mixture closely combined with the poplar bark, then effectively separates the poplar bark from the trunk by pressure treatment, and reduces the peeling shearing force after treatment to below 5kgf/cm, thereby having good peeling effect and low rework rate and being suitable for popularization.
Description
Technical Field
The invention belongs to the technical field of poplar processing, and particularly relates to a pretreatment method for peeling fast-growing poplar.
Background
Poplar has the characteristics of high growth speed, wide application range and convenient processing, is a pillar type industry in many areas, has one key link in the wood processing process of peeling, previously, wood peeling was mainly done manually, but nowadays, peeling machines have gradually replaced the manual work, in the practical operation process, the poplar bark and the trunk are difficult to separate, peeling can be realized only by large shearing force, the shearing pressure stress probably required is 100 kgf/cm, the power requirement of the peeling machine is improved, the peeling knife is easy to damage, in the prior art, the poplar bark and the trunk are deformed in different deformation under the action of pressure by pressure maintaining treatment under the sealing condition, further, the shearing stress of the barker is reduced, but in actual use, the barker is easy to be not peeled thoroughly, and the surface of the trunk can be damaged, so that certain material waste is caused.
Disclosure of Invention
The invention aims to provide a pretreatment method for peeling fast-growing poplar aiming at the existing problems.
The invention is realized by the following technical scheme: a pretreatment method for peeling fast-growing poplar comprises the following steps:
(1) soaking poplar raw material in starch solution, performing ultrasonic treatment on the poplar raw material for 30-40 minutes under the condition of 28-32kHz, taking out the poplar raw material after the ultrasonic treatment is completed, irradiating the poplar raw material for 30-40 minutes by using 80-100 w.s/m ultraviolet lamp light, and keeping the temperature of a treatment space at 33-37 ℃ and the humidity at 70-76% in the irradiation process;
the preparation method of the starch solution comprises the following steps: mixing corn starch with water 2-3 times of the weight of the corn starch, adding a hydrochloric acid aqueous solution with the mass concentration of 26-30% and the weight of 12-16% of the corn starch, stirring and processing for 1-2 hours at the temperature of 55-65 ℃, standing for 30-40 minutes at normal temperature after completion, then adding stearic acid, xylene and absolute ethyl alcohol, the weight of which is 0.8-2.2% of the corn starch, 14-18% of the xylene and 20-30% of the absolute ethyl alcohol, and stirring for 40-60 minutes at the temperature of 40-50 ℃ to obtain the corn starch;
(2) treating the treated poplar raw material for 5-25 minutes under the pressure of 40-60 MPa.
As a further improvement to the scheme, the diameter of the poplar raw material is 10-30 cm.
As a further improvement to the scheme, the temperature of the starch solution in the step (1) is 75-85 ℃.
As a further improvement to the above scheme, in the ultraviolet lamp light irradiation process in the step (1), the poplar raw material is kept rotating, and the rotation speed of the poplar raw material is 120-.
As a further improvement of the scheme, the water content of the corn starch is lower than 10%, the acidity is less than or equal to 1.5 DEG T, the fineness is 80-100 meshes, and the sulfur dioxide content is less than or equal to 30 mg/kg.
As a further improvement to the above scheme, the stearic acid has a saponification value of 206-211mgKOH/g, an acid value of 205-210mgKOH/g, a water content of less than 0.3% and an iodine value of 2.0g/100 g.
Compared with the prior art, the invention has the following advantages: the invention utilizes the starch solution to bond the starch solution with the poplar bark together under the ultrasonic frequency condition, then irradiates by ultraviolet lamp to age and wrinkle the starch mixture closely combined with the poplar bark, then effectively separates the poplar bark from the trunk by pressure treatment, and has the advantages of good peeling effect, low rework rate, suitability for popularization and capability of prolonging the service life of the peeling machine, wherein the peeling shear force after treatment can be reduced to below 5 kgf/cm.
Detailed Description
Example 1
A pretreatment method for peeling fast-growing poplar comprises the following steps:
(1) soaking a poplar raw material in a starch solution, performing ultrasonic treatment on the poplar raw material for 35 minutes under the condition of 30kHz, taking out the poplar raw material after the treatment, irradiating the poplar raw material for 35 minutes by using 90 w.s/m ultraviolet lamp light, and keeping the temperature of a treatment space at 35 ℃ and the humidity at 73% in the irradiation process;
the preparation method of the starch solution comprises the following steps: mixing corn starch with water 2.5 times of the weight of the corn starch, adding a hydrochloric acid aqueous solution with the mass concentration of 28% and the weight of 14% of the corn starch, stirring and processing the mixture for 1.5 hours at the temperature of 60 ℃, standing the mixture for 35 minutes at normal temperature after the completion, then adding stearic acid, dimethylbenzene and absolute ethyl alcohol 25% of the weight of the corn starch, and stirring the mixture for 50 minutes at the temperature of 45 ℃ to obtain the corn starch composition;
(2) and (3) treating the treated poplar raw material for 7 minutes under the pressure of 50 MPa.
Wherein the temperature of the starch solution in the step (1) is 80 ℃; during the irradiation of ultraviolet ray lamp, the poplar material is made to rotate at 150 rpm.
Wherein the water content of the corn starch is less than 10%, the acidity is less than or equal to 1.5 DEG T, the fineness is 90 meshes, and the sulfur dioxide content is less than or equal to 30 mg/kg.
Wherein, the stearic acid has a saponification value of 206-211mgKOH/g, an acid value of 205-210mgKOH/g, a water content of less than 0.3 percent and an iodine value of 2.0g/100 g.
Example 2
A pretreatment method for peeling fast-growing poplar comprises the following steps:
(1) soaking the poplar raw material in a starch solution, performing ultrasonic treatment on the poplar raw material for 40 minutes under the condition of 28kHz, taking out the poplar raw material after the treatment, irradiating the poplar raw material for 30 minutes by using an 80 w.s/m ultraviolet lamp light, and keeping the temperature of a treatment space at 37 ℃ and the humidity at 76% in the irradiation process;
the preparation method of the starch solution comprises the following steps: mixing corn starch with water 2 times of the weight of the corn starch, adding a hydrochloric acid aqueous solution with a mass concentration of 26% and a weight concentration of 16% of the weight of the corn starch, stirring and treating for 2 hours at 65 ℃, standing for 30 minutes at normal temperature after completion, adding stearic acid 0.8% of the weight of the corn starch, xylene 18% of the weight of the corn starch, absolute ethyl alcohol 30% of the weight of the corn starch, and stirring for 40 minutes at 50 ℃ to obtain the corn starch composition;
(2) and (3) treating the treated poplar raw material for 5 minutes under the condition that the pressure is 60 MPa.
Wherein the temperature of the starch solution in the step (1) is 85 ℃; during the irradiation process of the ultraviolet lamp, the poplar raw material keeps rotating, and the rotating speed of the poplar raw material is 180 r/h.
Wherein the water content of the corn starch is less than 10%, the acidity is less than or equal to 1.5 DEG T, the fineness is 80-100 meshes, and the sulfur dioxide content is less than or equal to 30 mg/kg.
Wherein, the stearic acid has a saponification value of 206-211mgKOH/g, an acid value of 205-210mgKOH/g, a water content of less than 0.3 percent and an iodine value of 2.0g/100 g.
Example 3
A pretreatment method for peeling fast-growing poplar comprises the following steps:
(1) soaking a poplar raw material in a starch solution, performing ultrasonic treatment on the poplar raw material for 30 minutes under the condition of 32kHz, taking out the poplar raw material after the treatment, irradiating the poplar raw material for 40 minutes by using 100 w.s/m ultraviolet lamp light, and keeping the temperature of a treatment space at 33 ℃ and the humidity at 70% in the irradiation process;
the preparation method of the starch solution comprises the following steps: mixing corn starch with water which is 3 times of the weight of the corn starch, adding a hydrochloric acid aqueous solution which is 12% of the weight of the corn starch and has a mass concentration of 30% into the mixture, stirring the mixture at the temperature of 55 ℃ for 1 hour, standing the mixture at normal temperature for 40 minutes after the completion of the stirring, adding stearic acid which is 2.2% of the weight of the corn starch, xylene which is 14% of the weight of the corn starch and absolute ethyl alcohol which is 20% of the weight of the corn starch, and stirring the mixture at the temperature of 40 ℃ for 60 minutes to obtain the corn starch;
(2) treating the treated poplar raw material for 10 minutes under the condition that the pressure is 40 MPa.
Wherein the temperature of the starch solution in the step (1) is 75 ℃; during the irradiation process of the ultraviolet lamp, the poplar raw material is kept rotating, and the rotating speed of the poplar raw material is 120 r/h.
Wherein the water content of the corn starch is less than 10%, the acidity is less than or equal to 1.5 DEG T, the fineness is 80-100 meshes, and the sulfur dioxide content is less than or equal to 30 mg/kg.
Wherein, the stearic acid has a saponification value of 206-211mgKOH/g, an acid value of 205-210mgKOH/g, a water content of less than 0.3 percent and an iodine value of 2.0g/100 g.
Setting a comparison group 1, replacing the ultraviolet light irradiation in the embodiment 1 with hot air drying treatment at the temperature of 60-70 ℃, and keeping the rest contents unchanged; setting a comparison group 2, removing the step (1) in the embodiment 1, and keeping the rest contents unchanged; setting a comparison group 3, removing stearic acid in the embodiment 1, and keeping the rest content unchanged; setting a control group 4, setting the starch solution in the embodiment 1 as normal temperature, and keeping the rest content unchanged; the pressure maintaining force of 5-year-old poplar with the application number of 2014105703376 under the condition of 300MPa is used as a control group 5;
detecting the minimum shearing force of each group of peeling knives for realizing peeling processing, setting 5 times of repetition for each treatment, and calculating the average value to obtain the following results:
TABLE 1
| Group of | Minimum shear force of skinning knife (kgf/cm) |
| Example 1 | 3.9 |
| Example 2 | 3.6 |
| Example 3 | 3.7 |
| Control group 1 | 14.8 |
| Control group 2 | 75.2 |
| Control group 3 | 6.9 |
| Control group 4 | 24.5 |
| Control group 5 | 5.3 |
Compared with the control group 5, the pressure intensity of pressure maintaining treatment in the invention is obviously reduced, which is beneficial to reducing energy consumption and avoiding damage to poplar.
Claims (6)
1. A pretreatment method for peeling fast-growing poplar is characterized by comprising the following steps:
(1) soaking poplar raw material in starch solution, performing ultrasonic treatment on the poplar raw material for 30-40 minutes under the condition of 28-32kHz, taking out the poplar raw material after the ultrasonic treatment is completed, irradiating the poplar raw material for 30-40 minutes by using 80-100 w.s/m ultraviolet lamp light, and keeping the temperature of a treatment space at 33-37 ℃ and the humidity at 70-76% in the irradiation process;
the preparation method of the starch solution comprises the following steps: mixing corn starch with water 2-3 times of the weight of the corn starch, adding a hydrochloric acid aqueous solution with the mass concentration of 26-30% and the weight of 12-16% of the corn starch, stirring and processing for 1-2 hours at the temperature of 55-65 ℃, standing for 30-40 minutes at normal temperature after completion, then adding stearic acid, xylene and absolute ethyl alcohol, the weight of which is 0.8-2.2% of the corn starch, 14-18% of the xylene and 20-30% of the absolute ethyl alcohol, and stirring for 40-60 minutes at the temperature of 40-50 ℃ to obtain the corn starch;
(2) treating the treated poplar raw material for 5-25 minutes under the pressure of 40-60 MPa.
2. The pretreatment method for barking of fast-growing poplar according to claim 1, wherein the diameter of the poplar raw material is 10-30 cm.
3. The method for pretreating peeled fast-growing poplar according to claim 1, wherein the temperature of the starch solution in the step (1) is 75-85 ℃.
4. The pretreatment method for barking of fast-growing poplar as claimed in claim 1, wherein the rotation speed of the poplar raw material is 120 and 180 rpm/h during the irradiation of the ultraviolet light in the step (1).
5. The pretreatment method for peeling fast-growing poplar as claimed in claim 1, wherein the moisture content of the corn starch is less than 10%, the acidity is less than or equal to 1.5 ° T, the fineness is 80-100 mesh, and the sulfur dioxide content is less than or equal to 30 mg/kg.
6. The method as claimed in claim 1, wherein the stearic acid has a saponification value of 206-211mgKOH/g, an acid value of 205-210mgKOH/g, a moisture content of less than 0.3%, and an iodine value of 2.0g/100 g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810870183.0A CN108908593B (en) | 2018-08-02 | 2018-08-02 | Pretreatment method for peeling fast-growing poplar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810870183.0A CN108908593B (en) | 2018-08-02 | 2018-08-02 | Pretreatment method for peeling fast-growing poplar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108908593A CN108908593A (en) | 2018-11-30 |
| CN108908593B true CN108908593B (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810870183.0A Active CN108908593B (en) | 2018-08-02 | 2018-08-02 | Pretreatment method for peeling fast-growing poplar |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5123524A (en) * | 1974-08-21 | 1976-02-25 | Gennosuke Yamaguchi | Setsuchakuzaino seizoho |
| CN104400862B (en) * | 2014-10-23 | 2017-01-11 | 浙江大学 | Method for increasing poplar peeling efficiency in man-made forest |
| CN107081825B (en) * | 2017-03-29 | 2018-08-24 | 阜南县环宇柳木工艺制品有限公司 | A method of preventing poplar craze and transfiguration |
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