CN110539375A - Teak color change treatment method - Google Patents
Teak color change treatment method Download PDFInfo
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- CN110539375A CN110539375A CN201910750457.7A CN201910750457A CN110539375A CN 110539375 A CN110539375 A CN 110539375A CN 201910750457 A CN201910750457 A CN 201910750457A CN 110539375 A CN110539375 A CN 110539375A
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- 240000002871 Tectona grandis Species 0.000 title claims abstract description 208
- 238000011282 treatment Methods 0.000 title claims abstract description 175
- 238000000034 method Methods 0.000 title claims abstract description 66
- 230000008859 change Effects 0.000 title description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 115
- 238000005286 illumination Methods 0.000 claims abstract description 54
- 238000002845 discoloration Methods 0.000 claims abstract description 14
- 238000009736 wetting Methods 0.000 claims description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 239000002023 wood Substances 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 238000003303 reheating Methods 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000011268 retreatment Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 230000036541 health Effects 0.000 abstract description 9
- 238000003672 processing method Methods 0.000 abstract description 4
- 238000012958 reprocessing Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 13
- 230000009471 action Effects 0.000 description 11
- 238000007761 roller coating Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 7
- 239000003973 paint Substances 0.000 description 6
- 239000010931 gold Substances 0.000 description 5
- 229910052737 gold Inorganic materials 0.000 description 5
- 238000007731 hot pressing Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 239000012948 isocyanate Substances 0.000 description 4
- 150000002513 isocyanates Chemical class 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003359 percent control normalization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- FFRBMBIXVSCUFS-UHFFFAOYSA-N 2,4-dinitro-1-naphthol Chemical compound C1=CC=C2C(O)=C([N+]([O-])=O)C=C([N+]([O-])=O)C2=C1 FFRBMBIXVSCUFS-UHFFFAOYSA-N 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000011418 maintenance treatment Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000007539 photo-oxidation reaction Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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- 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
- B27K1/00—Damping wood
-
- 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
- B27K5/001—Heating
-
- 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
-
- 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
- B27K5/02—Staining or dyeing wood; Bleaching wood
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The application provides a teak processing method that discolours, including the step of surface wet processing, ultraviolet irradiation's step, still including locating heating process's between the step of ultraviolet irradiation, in heating process's step, the heating method includes the mode of one or the combination of two kinds in infrared illumination heating, convection heating, the mode of contact heating to heating teak blank. It can avoid the production of surface dark crack, end crack, surface burr comparatively effectively through add the step of heat treatment before ultraviolet illumination's step, forms or deepens black golden texture on teak blank surface to after the processing of discolouing, teak blank moisture content is even, reduces the health preserving time, thereby when improving teak discoloration treatment production efficiency, guarantees quality, the quality grade of teak blank.
Description
Technical Field
The application relates to the technical field of wood material physical modification treatment methods, in particular to a teak physical discoloration treatment method.
Background
The teak is a high-quality raw material for manufacturing the solid wood floor, and has the advantages of corrosion resistance, wear resistance, beautiful patterns, elegant and beautiful color tone and good stability. The sun-cured teak plain board is an indispensable link for processing and manufacturing teak floors, and has the effects that the color of the teak plain board is changed from brown to golden yellow, the teak plain board has luster and uniform wood color through the oxidation effect of ultraviolet irradiation in sunlight, and black and golden textures are deepened. In the prior art, the teak floor blank which is finished with the manufacture of the short edge groove and the edge sealing of the short edge paint is paved outdoors and subjected to solarization for 10 to 15 days (according to the weather conditions), water or chemical agents are sprayed on the surfaces of the teak plain boards at intervals, and natural health preservation is carried out for about 30 days to finish the treatment of solarizing the teak, wherein the whole process takes about 40 to 45 days.
The traditional teak sun-drying process has the following problems: the processing time of 40 days to 45 days is too long, the stock pressure of materials is increased, the materials basically depend on natural weather, and the labor intensity of workers is high; on the other hand, the surface of a sun-cured plain plate is the surface treated by paint, the surface can be scratched when the plain plate is sun-cured outdoors for a long time, and the blank is deformed due to repeated water spraying and sun-curing, so that the finished rabbet is difficult to assemble.
In order to solve the above problems of the traditional teak sun-drying process, Chinese patent CN 200910308719.0 discloses a color-changing method of teak floor (applicant: Zhejiang Jiuzi floor Limited), wherein a teak board with the surface soaked in clear water with pH value of 6.5-7.5 is placed under ultraviolet light with wavelength of 280 plus 400 nm and temperature of 700 plus 800 ℃ for irradiation for 2-4 minutes and repeated for 4-5 times, thereby realizing color change treatment of the teak board by using the flow line and greatly improving the production efficiency of the color change treatment of the teak.
However, in long-term production practice, the patent document discloses that the technical method is not popularized in the past decade, and floor manufacturing enterprises still select the traditional sun-cured teak process. There are three reasons for this situation. First, although this method can shorten the treatment period from 1 month to several minutes, the black lines on the surface of teak are significantly reduced after the treatment (page 2/2, paragraph 1 of patent CN 200910308719.0 specification), and the material grade (decorative value) of teak is in black gold lines in addition to glossy gold color. For example, teak produced in Burma has a more black-gold texture in a golden bottom color after sun-drying treatment, so that the market price per cube is much higher than that of teaks produced in other producing areas. Secondly, in long-term production practice, the teak wood material treated by the method is found to have dark cracks and more terminal cracks on the surface. The surface hidden cracks are defects which are not easy to find in the previous working procedure but are not allowed to exist, and appear in the surface painting working procedure, so that the teak blank needs to be subjected to plate changing treatment (the surface hidden cracks are removed, the thickness of the plate is reduced) after the paint is sanded and removed, and the production efficiency and the outturn rate are influenced. Meanwhile, the moisture content of the teak blanks treated by the method is uneven (the deviation of the moisture content in the plates is large), and a relatively long curing treatment time is still needed to ensure that the moisture content of the teak blanks is uniform, so that the treatment efficiency is low. Thirdly, after the color changing treatment, the teak blank is rough in surface and has burrs, so that the blank surface which is subjected to fine sanding needs to be sanded again, and the flatness requirement of the paint process can be met.
Disclosure of Invention
The technical purpose of this application lies in, overcome above-mentioned technical problem, thereby provide a teak processing method that discolours, it is through addding heat treatment's step before ultraviolet illumination's step, can avoid the production of surface dark fracture, end fracture, surface burr comparatively effectively, form or deepen black gold texture on teak blank surface, and after discolour and handle, teak blank moisture content is even, can reduce the health preserving time, thereby when improving teak discoloration treatment production efficiency, guarantee the quality, the quality grade of teak blank.
In order to achieve the technical purpose, the invention provides a teak color change treatment method which comprises a surface wet treatment step, an ultraviolet irradiation step and a heating treatment step before the ultraviolet irradiation step, wherein in the heating treatment step, the heating mode comprises one or a combination of two of infrared irradiation heating, convection heating and contact heating to heat teak blanks.
Through long-term practical research of the inventor, the ultraviolet irradiation can relatively well simulate the natural sun-drying condition (temperature and medium-wave ultraviolet rays are formed in an ultraviolet irradiation space), the teak color change treatment is completed in a very short time, after the surface wet treatment, a wetting layer or a wetting surface is formed on the surface of a teak blank, after the wet and cold wood is directly subjected to the ultraviolet irradiation, moisture in the wetting layer or the wetting surface is rapidly volatilized, the phenomena of dark cracking and end cracking of the surface of the teak blank are caused, the surface is rough, burrs are more formed, and the moisture content of the teak blank is uneven. On the other hand, because the processing time is short, the mineral substances in the teak wood moisture channel do not move to the blank surface (namely a wetting layer or a wetting surface), and the original chromophoric group changes the wood color under the action of photooxidation, the wood colors of the teak blanks after the color change processing by the technical scheme in the comparison document tend to be consistent, and the black and golden textures are reduced.
The utility model provides a teak processing method that discolours, through before ultraviolet irradiation's step, add the step of heat treatment, in one aspect, make teak blank heated and have certain temperature before getting into ultraviolet irradiation, simultaneously, the moisture in the step of surface wet processing is in the moist layer or the moist face that teak blank surface formed is volatilized (partially), thereby can avoid wet chill timber directly to receive ultraviolet irradiation and form the emergence of the condition of surperficial dark fracture, end crack, surface burr on teak blank surface betterly, meanwhile, teak blank moisture content is even unanimous relatively. Particularly, when the heating mode in the step of heating treatment is a contact heating mode, the problems of rough surface and surface burrs can be avoided, a flat treatment surface can be formed, and the teak blank subjected to color change treatment can directly meet the processing requirements of a paint process. In another aspect, the step of heating treatment enables moisture in the teak blank to volatilize, and as the moisture volatilizes, minerals in the moisture channel migrate to the surface of the wood along with the moisture, and then after being irradiated by ultraviolet light, black and golden textures are formed on the surface of the teak blank. Therefore, by means of the method, the teak color-changing treatment method can improve the teak color-changing treatment production efficiency and ensure the quality and quality grade of teak blanks.
Preferably, the heating step is provided between the surface wet treatment step and the ultraviolet irradiation step.
Preferably, the step of heat treatment is provided before the step of surface wet treatment.
Preferably, when the heating process is to heat the teak wood blank by one of infrared light heating, convection heating and contact heating, the heating temperature is 25-120 deg.C and the heating time is 15-30 s; when the heating treatment step is to heat the teak wood blank by a combination of infrared illumination heating and convection heating, the heating temperature is 25-120 ℃ and the heating time is 5-15 s.
Preferably, when the heating process is to heat the teak wood blank by one of infrared light heating, convection heating and contact heating, the heating temperature is 50-80 deg.C and the heating time is 15-30 s; when the heating treatment step is to heat the teak wood blank by a combination of infrared illumination heating and convection heating, the heating temperature is 50-80 ℃ and the heating time is 5-15 s.
Preferably, the teak wood blank is heated by means of convection heating or contact heating before the surface wet treatment step; after the surface wet treatment step, teak blanks are heated by means of infrared light heating.
Preferably, the surface wet treatment step is to roll a wetting liquid on the surface of the teak wood.
Preferably, in the step of surface wet treatment, the wetting liquid is clear water, and the coating weight of the wetting liquid is 20 to 40g per square meter.
Preferably, in the step of surface wet treatment, the wetting liquid comprises clear water and a color-changing treatment agent.
Preferably, in the step of ultraviolet irradiation treatment, the ultraviolet light is medium-wave ultraviolet light, and the ultraviolet irradiation treatment time is 2-6 min.
Preferably, after the step of ultraviolet irradiation, a step of temperature reduction treatment is further included.
Preferably, the cooling process is performed by cooling the teak blanks by blowing air.
Preferably, the cooling process is performed by cooling the teak blanks by blowing vertical air at a speed of 0.1-10 m/s.
Preferably, the temperature reduction treatment step reduces the surface temperature of the teak wood blank to 1-10 ℃ higher than the room temperature.
Preferably, the teak color change treatment method further comprises a step of 1 to 3 times of retreatment, wherein the retreatment step comprises a step of surface re-wetting treatment, a step of reheating treatment, a step of re-ultraviolet irradiation and a step of re-cooling treatment, and the step of reheating treatment is to heat the teak blank by means of infrared irradiation heating or contact heating.
Preferably, in the reheating treatment step, the heating temperature is 50-100 ℃ and the heating time is 5-15 s.
Preferably, in the reheating treatment step, the heating temperature is 50-70 ℃ and the heating time is 5-15 s.
Preferably, the teak color-changing treatment method further comprises a step of adjusting the water content before the step of surface wet treatment, wherein in the step of adjusting the water content, the water content of the teak blank is adjusted to 9-12%.
According to the teak color-changing treatment method, the heating treatment step is added before the ultraviolet illumination step, so that the generation of surface dark cracks, end cracks and surface burrs can be effectively avoided, the water content of the treated teak blank is relatively uniform, and black gold textures are formed or deepened on the surface of the teak blank, so that the quality and quality grade of the teak blank are ensured while the teak color-changing treatment production efficiency is improved.
Furthermore, the surface of the teak blank is soaked by adopting a roller coating method, so that the surface of the teak blank can be uniformly wetted, and the soaking amount can be controlled.
Furthermore, through the setting of the step of cooling treatment, can make the even unanimity of inside moisture content of teak blank, reduce the surface and the sandwich layer temperature of teak blank fast, it combines together with the step of heat treatment to can cancel the step of health preserving processing and the step of secondary fine sand, make the teak blank after the processing can satisfy the moisture content of paint process, the technological requirement of surface smoothness, thereby further improve the treatment effeciency of teak discoloration.
Furthermore, when the teak blank is in the reprocessing process, the teak blank has a certain temperature, and the wetting layer or the wetting surface on the surface of the teak blank can have a higher temperature than other thickness parts of the teak blank after the reheating treatment step, so that chromophoric groups and mineral substances in the teak blank are promoted to migrate to the wetting layer or the wetting surface along with the volatilization of water, and the surface discoloration treatment effect and the deepening of black and golden textures of the teak blank can be facilitated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a process diagram of a teak discoloration treatment method according to embodiments 1 to 3 of the present invention;
FIG. 2 is a process diagram of a teak discoloration treatment method according to embodiments 4 to 5 of the present invention;
Fig. 3 is a process diagram of the teak discoloration treatment method of embodiments 6 to 8 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1: in this embodiment, the season of treatment is summer, and the outdoor temperature is 35-37 ℃, referring to a teak color change treatment method shown in fig. 1, the method sequentially comprises the following treatment steps.
S101, adjusting the water content of the teak blanks to 10-12%, wherein the deviation of the water content in the teak blanks is less than 1.5%.
S102, carrying out surface wet treatment, namely rolling wetting liquid on the surface of the teak blank by using a sponge roller coating machine, wherein the wetting liquid is clear water, and the roll coating amount is 40 +/-1 g/square meter.
S103, heating, namely adding an air heater in the infrared illumination tunnel to simultaneously perform infrared illumination heating and convection heating (hot air heating) on the teak blanks, forming a heating temperature of 120 +/-1 ℃ in the infrared illumination tunnel through the combined action of an infrared light lamp and the air heater, and consuming 5s from the time when the teak blanks enter the infrared illumination tunnel to the time when the teak blanks leave; in this step, the temperature in the infrared illumination tunnel may also be adjusted to a heating temperature of 100 ± 2 ℃, at which time the teak wood blank takes 12s from entering the infrared illumination tunnel to leaving.
S104, ultraviolet irradiation is carried out in an ultraviolet tunnel, the ultraviolet is medium-wave ultraviolet, and the ultraviolet irradiation treatment time is 5 min.
after the steps are completed, the method also comprises a reprocessing step, wherein the reprocessing step comprises the following processing steps.
And S105, carrying out surface wetting treatment, namely rolling wetting liquid on the surface of the teak blank by using a sponge roller coating machine, wherein the wetting liquid is clear water, and the roll coating application quantity is 30 +/-1 g/square meter.
S106, a reheating treatment step, which is completed in the infrared illumination tunnel, wherein a heating temperature of 100 +/-1 ℃ is formed in the infrared illumination tunnel under the action of an infrared lamp, and the time consumed by teak blanks from entering the infrared illumination tunnel to leaving the teak blanks is 5 s.
and S107, performing ultraviolet irradiation in an ultraviolet tunnel, wherein the ultraviolet is medium-wave ultraviolet, and the ultraviolet irradiation treatment time is 4.5 min.
Repeating the step of reprocessing for 1 time, namely repeating the steps from S5 to S7 for 1 time, and carrying out the step of reprocessing for 2 times in total, and finally carrying out the curing treatment on the teak blank.
S111, a step of health preserving treatment, which is to place the teak blank in an indoor natural environment for standing for 48-60h, or in a constant-temperature health preserving room, standing for 24-36h in an environment of 30 ℃/80% RH.
Example 2: the difference between the example 2 and the example 1 is that in the step of S202. surface wet treatment, the coating amount of the roller coating is 28 +/-1 g per square meter; in S203, the heating treatment is completed in the infrared illumination tunnel, a heating temperature of 70 +/-1 ℃ is formed in the infrared illumination tunnel under the action of an infrared lamp, the time consumed by the teak blanks from entering the infrared illumination tunnel to leaving the infrared illumination tunnel is 20s, the temperature in the infrared illumination tunnel can also be adjusted to be a heating temperature of 50 +/-2 ℃ in the step, and at the moment, the time consumed by the teak blanks from entering the infrared illumination tunnel to leaving the infrared illumination tunnel is 25 s.
Example 3: in this embodiment, the season of treatment is winter, and the outdoor temperature is minus 5-5 ℃, and the teak color change treatment method sequentially comprises the following treatment steps.
S301, adjusting the water content of the teak blanks to 9-11%, wherein the deviation of the water content in the teak blanks is less than 1%.
S302, a step of surface wet treatment, namely, rolling a wetting liquid on the surface of the teak blank by using a sponge roller coater, wherein the wetting liquid is a mixture of clear water and a color change treatment agent, the color change treatment agent can be any one commercially available, for example, a formula of an isocyanate-containing modified solution disclosed in Chinese patent CN 107471358A, and the mass adding ratio of the isocyanate-containing modified solution to the clear water is 1: (30-32), and the coating weight of the roller coating is 20 +/-1 g/square meter.
S303, a heating treatment step, namely adding a hot air blower in the infrared illumination tunnel, closing the infrared light lamp, carrying out convection heating (hot air heating) on the teak blank, forming a heating temperature of 30 +/-1 ℃ in the infrared illumination tunnel, and taking 30s from the time when the teak blank enters the infrared illumination tunnel to the time when the teak blank leaves; it is also possible to form a heating temperature of 35 + -1 deg.C in the infrared illumination tunnel by convection heating (hot air heating), and the time taken for teak wood blank to leave from the infrared illumination tunnel is 28 s.
S304, ultraviolet irradiation is carried out in an ultraviolet tunnel, the ultraviolet is medium-wave ultraviolet, and the ultraviolet irradiation treatment time is 4 min.
After the steps are completed, the method also comprises a reprocessing step, wherein the reprocessing step comprises the following processing steps.
S305, carrying out surface wetting treatment, namely rolling wetting liquid on the surface of the teak blank by using a sponge roller coating machine, wherein the wetting liquid is clear water, and the coating amount of the roller coating is 25 +/-2 g/square meter.
S306, a reheating treatment step, which is completed in the infrared illumination tunnel, wherein a heating temperature of 25 +/-1 ℃ is formed in the infrared illumination tunnel under the action of an infrared lamp, and the time consumed by teak wood blanks from entering the infrared illumination tunnel to leaving the teak wood blanks is 10 s.
And S307, performing ultraviolet irradiation in an ultraviolet tunnel, wherein the ultraviolet is medium-wave ultraviolet, and the ultraviolet irradiation treatment time is 3.5 min.
Repeating the step of reprocessing for 1 time, namely repeating the steps from S5 to S7 for 1 time, and carrying out the step of reprocessing for 2 times in total, and finally carrying out the curing treatment on the teak blank.
S311, a step of health preserving treatment, which is to place the teak blank in an indoor natural environment for standing for 48-60h, or in a constant-temperature health preserving room, stand for 24-36h in an environment of 30 ℃/80% RH.
Example 4: in this embodiment, the season of treatment is spring/autumn, the outdoor temperature is 15-20 ℃, and referring to fig. 2, the teak discoloration treatment method sequentially comprises the following treatment steps.
S401, adjusting the water content of teak blanks to 10-12%, wherein the deviation of the water content in the teak blanks is less than 1%.
S402, heating treatment, namely, adding an air heater in the infrared illumination tunnel to simultaneously perform infrared illumination heating and convection heating on the teak blanks, forming a heating temperature of 50 +/-1 ℃ in the infrared illumination tunnel through the combined action of an infrared light lamp and the air heater, and consuming 7s from entering to leaving of the teak blanks in the infrared illumination tunnel.
S403, carrying out surface wet treatment, namely rolling wetting liquid on the surface of the teak blank by using a sponge roller coating machine, wherein the wetting liquid is clear water, and the roll coating amount is 40 +/-1 g/square meter.
S404, ultraviolet irradiation is carried out in an ultraviolet tunnel, the ultraviolet is medium-wave ultraviolet, and the ultraviolet irradiation treatment time is 6 min.
S405, a step of cooling treatment, in which 2-4 fans are installed above the teak blanks to form wind perpendicular to the plate surfaces of the teak blanks, the wind speed is controlled to be 2-3m/s, the teak blanks stay or pass through the vertical wind, the surface temperature of the teak blanks is reduced to be 4-6 ℃ higher than the room temperature, for example, when the room temperature is 21 ℃, the surface temperature of the teak blanks is at least reduced to be below 27 ℃, but can not be reduced too low, the treatment effect of the next step of retreatment can be influenced, and therefore, the temperature is not lower than 25 ℃.
After the steps are completed, the method also comprises a reprocessing step, wherein the reprocessing step comprises the following processing steps.
S406, performing surface wetting treatment, namely rolling wetting liquid on the surface of the teak blank by using a sponge roller coater, wherein the wetting liquid is clear water, and the roll coating amount is 35 +/-2 g/square meter.
And S407, a reheating treatment step, which is completed in the infrared illumination tunnel, wherein a heating temperature of 70 +/-2 ℃ is formed in the infrared illumination tunnel under the action of an infrared lamp, and the time consumed by teak wood blanks from entering the infrared illumination tunnel to leaving the teak wood blanks is 5 +/-2 s.
And S408, performing ultraviolet irradiation in an ultraviolet tunnel, wherein the ultraviolet is medium-wave ultraviolet, and the ultraviolet irradiation treatment time is 4min +/-5 s.
S409, a re-cooling treatment step, namely installing 2-4 fans above the teak blanks to form wind perpendicular to the plate surfaces of the teak blanks, controlling the wind speed to be 2m/s, enabling the surface temperature of the teak blanks to be 5-7 ℃ higher than the room temperature by staying or passing the teak blanks under the perpendicular wind, and enabling the surface temperature of the teak blanks to be at least reduced to below 28 ℃ but not too low when the room temperature is 21 ℃, so that the treatment effect of the next re-treatment process is influenced, and the treatment effect is not lower than 26 ℃. When the treatment season is winter, the surface temperature of teak wood blank is reduced to 1-3 ℃ higher than the room temperature; when the treatment season is summer, the surface temperature of teak wood blank is reduced to 7-10 deg.C higher than room temperature.
The step of reprocessing is repeated 2 times, that is, the steps from S6 to S9 are repeated 2 times, and 3 reprocessing steps are performed in total. Due to the arrangement of the step of cooling treatment and the step of cooling treatment again, the moisture content of the teak blanks can be uniform and consistent on one aspect, and the temperature of the teak blanks is reduced to be close to the room temperature, so that the teak blanks do not need to be subjected to health maintenance treatment, the moisture content of the teak blanks is fully cooled, the moisture content of the teak blanks is adjusted to be uniform, the treatment efficiency of color change treatment is further improved, and the time consumed by treatment is shortened; in another aspect, the teak blanks are raised again from a lower temperature to a relatively higher temperature in each reprocessing process, so that the treatment effect of the discoloration treatment can be ensured.
Example 5: example 5 is different from example 4 in that s502. the step of heat treatment is performed using a plurality of rows of hot press rolls, the hot press rolls may use contact pressure or pressure of 0.2-0.3Mpa, the temperature of the hot press rolls is 80 ± 1 ℃, and the time taken for teak blanks to leave from the plurality of rows of hot press rolls is 5 seconds.
Example 6: referring to fig. 3, a teak color change treatment method sequentially includes the following treatment steps.
S601, adjusting the water content of the teak blanks to 9-11%, wherein the deviation of the water content in the teak blanks is less than 1%.
S602, a step of heating treatment, which is to arrange air heaters at equal intervals in the heating protective cover so as to form a hot air tunnel, wherein the heating temperature of 30 +/-1 ℃ is formed in the hot air tunnel under the action of the air heaters, and the time consumed by teak blanks from entering the infrared illumination tunnel to leaving the infrared illumination tunnel is 15 s.
S603, carrying out surface wet treatment, namely rolling wetting liquid on the surface of the teak blank by using a sponge roller coating machine, wherein the wetting liquid is clear water, and the roll coating amount is 40 +/-1 g/square meter.
S604, a heating treatment step is completed in the infrared illumination tunnel, a heating temperature of 85 +/-1 ℃ is formed in the infrared illumination tunnel under the action of an infrared lamp, and the time consumed by teak blanks from entering the infrared illumination tunnel to leaving the infrared illumination tunnel is 15 s.
S605, an ultraviolet irradiation step, which is completed in an ultraviolet tunnel, wherein the ultraviolet is medium-wave ultraviolet, and the ultraviolet irradiation treatment time is 3min +/-5 s.
S606, a cooling treatment step, namely installing 2-4 fans above the teak blanks to form wind perpendicular to the plate surfaces of the teak blanks, controlling the wind speed to be 8-9m/s, and enabling the teak blanks to stay or pass through under the perpendicular wind to reduce the surface temperature of the teak blanks to be 6-9 ℃ higher than the room temperature.
After the steps are completed, the method also comprises a reprocessing step, wherein the reprocessing step comprises the following processing steps.
S607, carrying out surface wetting treatment by using a sponge roller coater to roll and coat wetting liquid on the surface of the teak blank, wherein the wetting liquid is clear water, and the roll coating amount is 32 +/-1 g/square meter.
And S608, a reheating treatment step, which is completed in the infrared illumination tunnel, wherein a heating temperature of 90 +/-1 ℃ is formed in the infrared illumination tunnel under the action of an infrared lamp, and the time consumed by the teak wood blank from entering the infrared illumination tunnel to leaving the teak wood blank is 10 s.
And S609, performing ultraviolet irradiation in an ultraviolet tunnel, wherein the ultraviolet is medium-wave ultraviolet, and the ultraviolet irradiation treatment time is 3min +/-5 s.
And S612, a secondary cooling treatment step, namely installing 2-4 fans above the teak blanks to form wind perpendicular to the plate surfaces of the teak blanks, controlling the wind speed to be 8-9m/s, and enabling the teak blanks to stay or pass through under the vertical wind to reduce the surface temperature of the teak blanks to be 7-10 ℃ higher than the room temperature.
The step of reprocessing is repeated 2 times, that is, the steps from S607 to S610 are repeated 2 times, and 3 times of reprocessing are performed in total.
Example 7: example 7 differs from example 6 in that,
S702, a heating treatment step is realized by utilizing a plurality of rows of hot pressing rollers, wherein the hot pressing rollers can adopt contact pressure or pressure of 4.5-5Mpa, the temperature of the hot pressing rollers is 40 +/-1 ℃, and the time consumed by teak blanks from entering the plurality of rows of hot pressing rollers to leaving the hot pressing rollers is 6 s.
S703. a step of surface wet treatment, which is to roll coat a wetting liquid on the surface of the teak blank by using a sponge roller coater, wherein the wetting liquid is a mixture of clear water and a color-changing treatment agent, and the color-changing treatment agent may be any one commercially available, for example, a formula of an isocyanate-containing modified solution disclosed in chinese patent CN 107471358A, and a mass adding ratio of the isocyanate-containing modified solution to the clear water is 1: (100- & ltSUB & gt 105- & gt), the coating weight of the roller coating is 30 +/-2 g/square meter.
Example 8: example 8 differs from example 6 in that,
S804, a heating treatment step is completed in the infrared illumination tunnel, a heating temperature of 65 +/-2 ℃ is formed in the infrared illumination tunnel under the action of an infrared lamp, and the time consumed by teak blanks from entering the infrared illumination tunnel to leaving the infrared illumination tunnel is 10 +/-2 s.
The comparison of the quality of teak blanks using the teak color change treatment methods of examples 1 to 8, the teak color change treatment method of the prior art, and the conventional sun-cured teak treatment method is shown in the following table. Wherein, the sample total amount is that every experimental group 100 initial time does not have the teak blank that the surface was dark to split, through changing the color and handling the back, adopts the halogen lamp to shine the teak blank surface, and the naked eye looks estimation observes teak blank surface, and the record surface forms the teak blank quantity that the surface was dark to split, regards as the quantitative value of teak change look processing quality with the ratio of this quantity and sample total amount, and the higher the ratio indicates that the teak blank quantity that the surface was dark to split appears is more, then the processing quality is lower.
| Group of | Processing method | Total amount of sample | Number of teak blanks with dark cracks and end cracks | quality of treatment |
| Experimental group 1 | Example 1 | 100 pieces | 0 piece | 0% |
| Experimental group 2 | Example 2 | 100 pieces | 0 piece | 0% |
| Experimental group 3 | Example 3 | 100 pieces | 1 piece of | 1% |
| Experimental group 4 | Example 4 | 100 pieces | 2 pieces of | 2% |
| Experimental group 5 | Example 5 | 100 pieces | 1 piece of | 1% |
| Experimental group 6 | example 6 | 100 pieces | 2 pieces of | 2% |
| Experimental group 7 | Example 7 | 100 pieces | 1 piece of | 1% |
| Experimental group 8 | Example 8 | 100 pieces | 1 piece of | 1% |
| Control group 1 | Teak color changing treatment method in prior art | 100 pieces | 21 pieces | 21% |
| Control group 2 | Traditional sun-cured teak treatment method | 100 pieces | 5 pieces of | 5% |
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (16)
1. The teak color-changing treatment method comprises a surface wet treatment step and an ultraviolet illumination step, and is characterized by further comprising a heating treatment step before the ultraviolet illumination step, wherein in the heating treatment step, the heating mode comprises one or a combination of two of infrared illumination heating, convection heating and contact heating modes to heat teak blanks.
2. The teak color-changing treatment method according to claim 1, wherein said heating treatment step is provided between said surface wet treatment step and said ultraviolet irradiation step.
3. The teak color-changing treatment method according to claim 1, wherein the heating treatment step is provided before the surface wet treatment step.
4. The teak discoloration treatment method according to claim 2 or 3, wherein when said heating treatment step is heating teak blanks by one of infrared light heating, convection heating, contact heating, the heating temperature is 25-120 ℃ and the heating time is 15-30 s; when the heating treatment step is to heat the teak wood blank by a combination of infrared illumination heating and convection heating, the heating temperature is 25-120 ℃, and the heating time is 5-15 s.
5. The teak color-changing treatment method of claim 1, wherein the teak blank is heated by convection heating or contact heating before the surface wet treatment step; after the surface wet treatment step, teak blanks are heated by means of infrared light heating.
6. The teak color-changing treatment method of claim 1, wherein the surface wet treatment step is to roll a wetting liquid on the surface of teak blanks.
7. The method for discoloration treatment of teak according to claim 6, wherein in said step of surface wet treatment, said wetting liquid is clear water, and said coating amount of said wetting liquid is from 20 to 40g per square meter.
8. the teak color-changing treatment method of claim 6, wherein in the surface wet treatment step, the wetting liquid comprises clear water and a color-changing treatment agent.
9. The teak color-changing treatment method according to claim 1, wherein in the ultraviolet light treatment step, the ultraviolet light is medium-wave ultraviolet light, and the ultraviolet light treatment time is 2-6 min.
10. The teak color-changing treatment method according to claim 1, further comprising a step of cooling treatment after the step of ultraviolet irradiation.
11. The teak color-changing treatment method according to claim 10, wherein the cooling treatment step is to cool the teak blanks by blowing air.
12. The teak color-changing treatment method according to claim 11, wherein the cooling treatment step is to cool the teak blanks by blowing vertical air at a speed of 0.1-10 m/s.
13. The teak discoloration treatment method according to claim 10, wherein said temperature reduction treatment step reduces the surface temperature of teak blanks to 1-10 ℃ higher than room temperature.
14. The teak color-changing treatment method according to claim 1, wherein the teak color-changing treatment method further comprises 1 to 3 retreatments, the retreatments comprise a surface re-wetting treatment step, a reheating treatment step, an ultraviolet irradiation step and a re-cooling treatment step, and the reheating treatment step is to heat teak blanks by means of infrared irradiation heating or contact heating.
15. The teak discoloration treatment method according to claim 10, wherein in said reheating treatment step, the heating temperature is 50 to 100 ℃ and the heating time is 5 to 15 seconds.
16. The teak color-changing treatment method according to claim 1, further comprising a step of adjusting a water content before the step of surface wet-treating, wherein in the step of adjusting the water content, the water content of the teak blank is adjusted to 9-12%.
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| CN112361742A (en) * | 2020-09-16 | 2021-02-12 | 广州市佤臣木业有限公司 | Teak board drying treatment process |
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| CN101670603A (en) * | 2009-10-23 | 2010-03-17 | 浙江久盛地板有限公司 | Color-changing method of teak wood floor |
| CN106239657A (en) * | 2016-08-27 | 2016-12-21 | 安徽省阜南志峰工艺品有限公司 | A kind of bamboo chip for weaving cat house processes technique |
| CN107471358A (en) * | 2017-09-20 | 2017-12-15 | 安徽三和工艺品有限公司 | A kind of teak discoloration processing method |
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| JPS608004A (en) * | 1983-06-27 | 1985-01-16 | 大塚化学株式会社 | Composition for preventing color change of wood |
| CN101670603A (en) * | 2009-10-23 | 2010-03-17 | 浙江久盛地板有限公司 | Color-changing method of teak wood floor |
| CN106239657A (en) * | 2016-08-27 | 2016-12-21 | 安徽省阜南志峰工艺品有限公司 | A kind of bamboo chip for weaving cat house processes technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
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