阅读说明：本技术 柚木变色处理方法 (Teak color change treatment method ) 是由 刘彬彬 康志平 于 2019-08-14 设计创作，主要内容包括：本申请提供一种柚木变色处理方法,包括表面湿处理的步骤、紫外光照的步骤,还包括设于所述紫外光照的步骤之间的加热处理的步骤,所述加热处理的步骤中,加热方式包括红外光照加热、对流加热、接触加热的方式中的一种或两种的组合的方式,以加热柚木坯料。其通过在紫外光照的步骤之前增设加热处理的步骤,能够较为有效地避免表面暗裂、端裂、表面毛刺的产生,在柚木坯料表面形成或加深黑金纹理,并且在变色处理后,柚木坯料含水率均匀,减少养生时间,从而在提高柚木变色处理生产效率的同时,保证柚木坯料的质量、品质等级。(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.)

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%.

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.