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    Home > Coatings News > Paints and Coatings Market > Research and application of thermal transfer of high-quality environmentally friendly aluminum alloy wood pattern profiles

    Research and application of thermal transfer of high-quality environmentally friendly aluminum alloy wood pattern profiles

    • Last Update: 2020-12-24
    • Source: Internet
    • Author: User
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    Abstract: This paper briefly introduces the thermal transfer manufacturing process of aluminum alloy wood pattern profiles. The results of coating, heat transfer method and characteristics, thermal transfer pattern and formation process, ink in transfer paper or film on substrate surface coating, as well as the influence of different temperature and time on the quality of transfer wood grain and pattern color change are analyzed and discussed. The thermal transfer process of aluminum alloy wood-printed profiles in industrial applications was analyzed and tested, and the atmosphere graph in the furnace was graphed during normal and abnormal production

    . It has a high practical application reference value to the production plant.
    Foreword
    Green environmental protection can replace natural wood resources of aluminum alloy surface wood profiles, its application is more and more extensive, the use of more and more large, has been widely used in architecture, indoor door frame door fans, a variety of cabinets, such as bookcases, Wine cabinets, wardrobes, shoe cabinets, storage cabinets, tables and chairs, the surface shows wood-like aluminum ladders, various frames, decorative panels, wires, special profiles and antique carvings and other wood-like products, as shown in Figure 1-4.
    This paper on high-quality environmentally friendly aluminum alloy wood-printed profiles of the thermal transfer process technology process carried out related experimental research, obtained in industrial applications aluminum alloy wood-printed profiles thermal transfer furnace production test graph, for the same industry technical experts and workers in the work of the application of reference, play a role in throwing bricks to lead jade.
    process flowchart for the manufacture of aluminum-alloy wood-printed profiles
    the manufacturing process for high-quality aluminum-alloy wood-printed profiles, as shown in Figure 5.
    High-quality aluminum alloy wood profile with coating performance
    2.1 thermal transfer aluminum alloy profile surface base film coating coating
    from the paint coating on the selection of weather resistance is divided into:
    (1) ultra-strong weather-resistant coating, after research is considered optional: a. modified fluorocarbon powder; b.3D, 4D wood powder.
    (2) ultra-weather-resistant coatings, the study considered that optional: a. ultra-weather-resistant PU powder; b. ultra-weather-resistant polyester powder.
    (3) general weather-resistant coatings, available in: a.PU powder; b. modified PU powder; c. pure polyester powder.
    -related characteristics of performance, including ordinary pure polyester powder, TGIC cured powder coating, the current market share of a larger amount, low cost, but there is a poor coating surface leveling and transfer of wood grain texture of poor clarity defects.
    choose hydroxyl resin and IPDI curing agent synthetic manufacture of polyurethane powder, or PU powder, its reaction type:
    in the aluminum alloy surface made of the surface film smooth, smooth, high film hardness, transfer of wood grain sharpness. After the application of research found that its existence is applied to industrial production, the baking curing process, the smoke generated in the furnace is larger, increasing the cost of environmental protection management.
    3D, 4D wood-print powder and fluorocarbon powder, which is considered to be used to manufacture high-quality aluminum alloy wood-print profiles with excellent ultra-weather resistance.
    There transfer principle of aluminum alloy surface wood thread profile
    3.1 principle of wood pattern thermal transfer of aluminum profile surface

    3.1.1 Principle of Vacuum Thermal Transfer
    Using paper or plastic film with a surface that has been transferred wood-printed ink, wrapped in the surface of an aluminum alloy profile with a base coating, and then covered with a vacuumable plastic bag (set) ), vacuum so that its surface flat paste, and then into a heat transfer furnace heating treatment of about 200 degrees C about 15min, the process control is strict, the surface can be obtained with the required variety of wood patterns and colors and good quality aluminum alloy wood pattern profiles.
    Wood-printed vacuum thermal transfer can be used for shaving wood-print profiles, a variety of doors and windows, curtain wall profiles, home and home aluminum alloy profiles and other special aluminum alloy profiles and surfaces with etching, bump feel and rubber roller pull flowers of a variety of aluminum alloy profiles surface wood pattern manufacturing.
    The thermal transfer process of wood profiles on aluminum alloy surfaces is as follows: manufacturing aluminum profile surface base coating layer (spraying or electrophoresis) →bedit coating curing (baking)→ paper or plastic film with ink Covered with a base coating profile surface → sets of vacuum plastic bags→ vacuum so that paper or plastic film flattened on the aluminum profile surface→ sent to the thermal transfer furnace (controlled at about 200 degrees C, 15min Under conditions) thermal transfer →searthed cooling→ removal of paper or plastic transfer film wrapped on the surface of the profile →seal quality inspection→ qualified product packaging→ supply to market users
    3.1.2 glue transfer Printing principle
    glue transfer is mainly used for small flower buckle plate, door frame fan, curtain wall aluminum plate, aluminum alloy blinds and other materials thin aluminum profile or wire, tubes, grooves and other shapes of complex aluminum alloy work materials. Glue transfer production costs are low, high efficiency, ink penetration layer shallow, fast curing speed, product weather resistance than vacuum thermal transfer product quality grade is low.
    3.2 Basic coating coating for thermal transfer wood
    powder coating for thermal transfer base coating, which consists mainly of: (1) membrane formation polyester resin; Color, filling and covering effect, (3) curing agent, the main role is to mix with polyester resin to produce cross-linking polymer, forming a hardened state of polymer coating film, in the coating film cover state of the aluminum alloy surface to play a protective role.
    3.3 Thermal transfer ink attached to hot transfer paper or plastic film
    The action layer of the color material can be used as a variety of wood grains, (2) ink additives, whose role is to grind the dispersion combination with the color material to improve its suitability of the material, (3) the connecting material is the carrying medium of the wood pattern profile color material.the results of the thermal transfer test of
    aluminum alloy wood-printed profiles and discussion
    4.1 Test instruments and equipment
    This test study mainly uses the following instruments and equipment:
    (1) aluminum alloy wood-printed profile thermal transfer furnace 1 seat (set) ;(2) aluminum alloy wood-printed surface base coating film manufacturing line or spray manufacturing line 1; Base coating film manufacturing oven 1; (4) coating film thickness meter one; (5) hardness clamp one; (6) wood-printed pressure plate transfer machine 1; (7) aluminum alloy boiling pot 1; (8) spinner 1; (9) electron microscope 1; (10) nanovolt meter thermocouple thermometer.
    4.2 Condition Test
    4.2.1 Transfer Temperature Test
    Under the same conditions as the wood thread thermal transfer time on the surface of the aluminum alloy profile, the effect of different temperature changes on the color change of the wood pattern. The result is that the color on the wood grain paper changes slowly from dark to light, and the ink penetrates to a near constant state as the temperature rises, which is ideal at 190-200 degrees C, and higher temperature is not necessary to consume energy. Figure 6 shows.
    4.2.2 Transfer time test
    aluminum alloy surface wood-printed thermal transfer temperature fixed under the same conditions, the change furnace stay insulation time on the wood pattern ink penetration in the base coating film layer from shallow to deep change, wood-printed paper ink tend to zero, curve to the horizontal. The result is 15min as ideal. Figure 7 shows.
    4.2.3 Basic coating concentration and coating film thickness test
    fixed preferably time 15min and temperature 190 oC change paint concentration and base coating thickness, observe the product's wood color color changes affect the situation. The test results show that the film thickness formed by the base coating is more important than the coating concentration, the concentration thin is to produce a certain film thickness slowly, and the film thickness directly affects the quality. According to the test results and related film thickness standards, the choice of ≥70-90 microns is more appropriate, near the upper limit of the film thickness on the wood thread thermal transfer product quality is favorable. As shown in Figure 8.
    4.2.4 Thermal transfer paper film separation test
    This test mainly examines the time spent in the thermal transfer furnace and the separation state of the temperature in the transfer furnace on aluminum alloy woodprint transfer paper or plastic film. Figure 9 shows.
    To the aluminum alloy wood pattern profile manufacturing process, there is a problem of non-separation between the wood grain paper and the product surface adhesion after transfer, according to the analysis of the test results, there are mainly the following factors: (1) is the aluminum profile surface base coating coating properties factors; (2) is the thermal transfer paper or film on the wood-print ink factor; (3) is the temperature control factor of the thermal transfer process; (4) is the aluminum profile surface wood-printed thermal transfer process furnace in the dwell time factor.
    According to repeated test analysis, found that when the use of the base surface film paint, heat transfer temperature and wood-printed heat transfer paper ink and transfer process furnace stay time several factors a certain time, accidentally found that the thermal transfer process in the furnace stay too long will lead to wood grain paper and profile surface film adhesion phenomenon. Repeated tests confirmed that when the use of profile surface base coating, thermal transfer temperature fixed at about 195 degrees C and fixed use of an ink transfer paper, the furnace heat transfer time normal after 15min continued to extend to 20min, wood profile surface paper film adhesion occurred. the possible cause of
    analysis is the temperature ≥195 degrees C, the furnace stay time of more than 20 minutes, its surface coating layer in a vacuum adhesion state, the film may begin to melt the adhesive state, resulting in heat transfer paper back glued to the molten collusion, after cooling out of the oven can not be naturally separated off.
    4.2.5 Wood ink penetration test
    The effect of ink on wood grain paper on the penetration depth of the profile surface base coating film.
    table 1 below lists the test results of the depth of penetration of the film formed using several different profile base coatings for the thermal transfer of inks on wood-printed paper.
    From the test results of Table 1, it can be seen that the use of polyurethane high hydroxyl powder as the base coating coating of the profile, the ink penetration transfer in wood grain paper is not conducive to ink penetration, ink penetration depth is very shallow, may have a greater impact on product quality and stability.
    4.2.6 Wood-print fade test on the surface of the profile
    4.2.6.1 High-temperature boiling test
    and wood-printed profiles made from different coating films are placed in the pot and boiled with boiling water. The resulting fading condition, as shown in Figure 10.
    results show that the film formed with different coatings in the same thermal transfer temperature, time conditions, obtained wood-print aluminum profile products after boiling, low-grade paint film and low-grade ink wood grain paper products and high-grade paint film and wood grain paper products compared to a certain difference. Advanced raw materials of the product, boiled wood pattern fade is not obvious.
    4.2.6.2 Ultraviolet radiation resistance test
    the aluminum alloy surface wood profile, in a sealed test case, one end of the aluminum is obscured, the other end exposed in light conditions for the test. The test conditions are: 9 hours of light per day, three weeks in a row, the total lighting time is 189 hours. The luminescent body is the UVB313 light source, the temperature inside the test box: 60-65 degrees C, the grayscale card test where the color change occurs, the results are shown in Figure 11.
    results show that different coatings and wood-printed ink pigments are used, and the effects of light-resistant irradiation of their products are different.
    (c) and (d) in Figure 11 are among the higher quality aluminum alloy wood profile products, and (e) for the use of ultra-high weather-resistant Italian imported wood grain paper, the base coating film is FEVE fluorocarbon powder coating. The obtained aluminum alloy wood-printed lighting resistance is very good, pattern color change is very small, grayscale card 4 levels.
    4.2.6.3 Inorganic and organic solvent corrosion test
    test conditions: 10% HCl, 10% NaOH and ethanol are dripped into the wood grain of the aluminum alloy surface, and the reagent observation surface results are erased after 48h is placed, as shown in Figure 12.
    results of Figure 12 show that the thermal transfer wood grain on the aluminum surface of good quality products, resistant to organic and inorganic solvents corrosion is very strong, its quality is similar to ceramic printed glazed products.
    Alum alloy profile wood thread thermal transfer technology in industrial production application
    in the aluminum alloy wood pattern profile industrial production application, there are differences in the use of technical equipment manufacturing quality and control technical performance methods, which may have an impact on the quality of wood pattern profile products manufactured. The test curve for the application of thermal transfer technology in industrial production is shown in Figures 13 and 14.
    conclusion
    (1) test results show that according to the existing chemical coatings, such as medium and high-level solid powder coatings, fluorocarbon coatings, etc. can produce high-quality wood-print aluminum profile products.
    (2) the technical problems affecting high-quality wood-print aluminum products can be solved according to the test results.
    (3) manufacturing high-quality high-weather-resistant wood-print aluminum alloy profile products, whether in chemical raw materials or wood-print ink manufacturing process technology and equipment, still need to carry out comprehensive technological innovation, in this regard, the space for technological progress is still large, should further develop high-performance, low-cost, environmental protection and energy-saving new chemical coatings and process technology and equipment research.
    (4) the application test curve of industrial production in this experiment has a high practical application reference value in the production operation of enterprises.
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