In the field of surface decoration in the door industry, transfer printing technology is occupying a pivotal position with its unique process charm. Whether it is metallic steel door, lightweight aluminum alloy door, or plastic composite material door, transfer printing technology can give it rich and diverse appearance effects, showing irreplaceable advantages in enhancing the aesthetics of the door body. In the increasingly diversified consumer demand, from the pursuit of warm and natural style of civil home doors, to focus on both functionality and aesthetics of the commercial premises with the door, and then emphasize the artistic texture of the high-end custom doors, transfer technology with its strong pattern expressive power and flexible process adaptability, to perfectly meet the needs of all kinds of complex and changing design, for the door products to inject a unique aesthetic value.

The implementation process of transfer technology is full of flexibility and creativity. According to the design theme of the door and the use of the scene, free choice of wood, stone, cloth, leather and other massive pattern templates, and can even achieve personalized custom pattern precision transfer. With the help of advanced intelligent transfer equipment, operators can accurately set the core parameters such as temperature, pressure, time, etc., and then the exquisite patterns on the transfer paper can be reproduced vividly on the surface of the door body. Advanced equipment with automatic identification and intelligent control functions, according to the door material, transfer paper type and pattern complexity, automatically optimize the transfer parameters to ensure that the pattern transfer is accurate. Even inexperienced operators, after a short period of systematic training, will be able to master the operating skills of the equipment and complete the transfer work efficiently. This standardized, automated mode of operation effectively avoids the blurring of patterns, color deviations and other problems caused by differences in human operation, ensuring that the transfer effect of each door can meet high-quality standards, and realizing the stability and unity of the product's decorative effect.

In terms of customized production, transfer printing technology shows significant cost and efficiency advantages. Enterprises do not need to invest huge sums of money to carry out large-scale equipment transformation, only need to be equipped with basic transfer printing equipment and rich transfer paper resources, can quickly start the production of diversified door products. Compared with traditional hand-painting, spray painting and other decorative methods, transfer technology in response to different design needs, without complex color mixing process and long drying time, just replace the corresponding transfer paper and adjust a small number of parameters of the equipment, you can realize the appearance of the door body of the rapid transformation. This feature not only significantly reduces material loss and labor costs, but also shortens the production cycle. Enterprises are able to quickly set up a transfer printing production line with strong customization capability within a limited budget, responding to diversified order demands in the market in a timely manner, standing out in the highly competitive door market, helping enterprises to enhance market competitiveness, and realizing the continuous expansion of business scale and the steady improvement of brand value.

Home Security Doors

Medical Doors

Fire Doors

Industrial Fire Doors

Clean Doors

1）Workpiece off the line: take down the door frame/door leaf which has finished curing the primer powder.

2) Transfer area: manually stick the transfer paper to the surface of the door frame/fan.

3) Workpiece on line: hang the door frame/door after applying the transfer paper on the conveyor line.

4) Curing channel: after high temperature baking, the pattern of the transfer paper will be attached to the surface of the door frame/fan.

5) Transfer removal: the transfer paper will be torn off from the surface of the door frame/fan by hand.

6）Workpiece off-line: the finished door frame/door leaf off-line

7）Pre-treatment pool：Pass through the phosphating pool to remove the surface oil, dust, rust

8）Drying area: Phosphating finished door frame / door natural drying

9) Workpiece on the line: the door frame / door need primer hanging on the conveyor line

10）Pre-heating channel: remove the moisture on the surface of door frame/door, increase the adhesion of plastic powder.

11）Spraying room: spray the primer evenly onto the surface of the door frame/door by hand.

12) Curing baking channel: through high temperature baking, make the powder coating melting, leveling, curing.

1）Workpiece off the line: take down the door frame/door leaf which has finished curing the primer powder.

2) Transfer area: manually stick the transfer paper to the surface of the door frame/fan.

3) Workpiece on line: hang the door frame/door after applying the transfer paper on the conveyor line.

4) Curing channel: after high temperature baking, the pattern of the transfer paper will be attached to the surface of the door frame/fan.

5) Transfer removal: the transfer paper will be torn off from the surface of the door frame/fan by hand.

6）Workpiece off-line: the finished door frame/door leaf off-line

7) Transfer area: manually stick the transfer paper to the surface of the door frame/fan.

8) Workpiece on the line: the robot will put the door frame/door after applying the transfer paper on the conveyor line.

9) curing baking channel: after high-temperature baking, the pattern of the transfer paper will be attached to the surface of the door frame/fan.

10) Removal of transfer: manually remove the transfer paper on the door frame/door panel.

11) Workpiece off the line: the robot will be made to remove the finished door frame / door panel

Profit generating factors

Applicable structures

Preheating aisle

Curing aisle

Equipment investment

Employee requirements

Average daily production

Average wages

Equipment footprint

Turnover space

Probability of failure

Probability of scrapping

Corporate image

Manual spraying

All structures optional

35m

35m

60~700,000

9~13 persons

100~120 persons

7,000~8,000

500m²~600m²

100m²~180m²

low

low

Lean Manufacturing Plant

Automatic spraying

All structures are optional

35m

35m

2~3 million

2~4 people

150~200 gages

5000~6000

500m²~600m²

100m²~180m²

low

low

Automation factory

Recommended Requirements

Manual transfer printing+manual spraying solution: small batch customized production.

Manual transfer + automatic spraying solution: batch customized production.

Phosphating pool / electric hoist

On the workpiece: the use of electric hoist to lift the door plate and door frame smoothly, lifting to the phosphating pool above. The electric hoist has the functions of lifting, lowering, horizontal movement, etc., which can accurately control the position of the workpiece, and slowly put it into the phosphate pool on the hanging or bracket to ensure that the workpiece is well fixed for subsequent treatment.

Lowering: After completing the phosphating treatment and water washing, the door plate and door frame will be lifted up smoothly from the phosphating pool by the electric hoist and transported to the designated area for subsequent treatment, such as drying and painting. In the whole process, the stable operation and accurate positioning of the electric hoist ensures the smooth running of the pre-treatment process of door panels and frames, and improves the production efficiency and product quality.

Enhance the coating bonding force: through the chemical and electrochemical reaction on the metal surface of the door plate and door frame, a layer of phosphate chemical conversion film, i.e. phosphate film is formed. This film can significantly enhance the subsequent coating film (such as paint, spray coating, etc.) and the workpiece bonding force, so that the coating more firmly attached to the door and door frame, reducing the risk of coating off .

Enhance corrosion resistance: phosphating film can be isolated to a certain extent from the air, moisture and other corrosive media and metal substrate contact, effectively preventing the door and door frame corrosion, extend the service life of the door products.

Improve the decorative effect: after phosphating the surface of the workpiece, can make the subsequent coating color more uniform, full, improve the appearance of door products decorative.

Electric hoist with the use of pre-treatment process

Phosphate pool role

Phosphating is a chemical and electrochemical reaction to form a phosphate chemical conversion film process, this layer of phosphate film can enhance the adhesion of the subsequent coating of the door frame door, but also to enhance its corrosion resistance. After the phosphating treatment of the door frame door, the surface will be attached to the phosphate solution and other components, the need for natural drying to remove moisture, and let the phosphate film stable molding.

Staff will be phosphated door frame door carefully carried to a special drying area, which is usually well ventilated, free of dust pollution and avoid direct sunlight. During the natural drying process, the water gradually evaporates under the effect of air circulation, while the phosphating film undergoes further physical and chemical changes, resulting in a denser and more stable structure. This link does not require additional energy heating, drying by natural conditions, but need to control the environmental humidity and temperature. Generally speaking, in the appropriate temperature and humidity environment (temperature 20 - 30 ℃, relative humidity 40 - 60%), natural drying time is about 2 - 4 hours. However, if the ambient humidity is high or the temperature is low, the drying time will be extended accordingly.

Drying area

Selection and preparation of hooks and conveyor lines

Hooks: generally made of stainless steel or carbon steel, with sufficient strength and rigidity, able to withstand the weight of the door body and not deformed. Before use, carefully check the hooks, support parts have no wear and tear, fracture, there are problems in time to repair or replace. In order to ensure good contact between the door body and the hooks, and to prevent problems with the coating, the surface of the hooks should be clean and dry, without oil and rust, and if necessary, degreased and descaled pre-treatment.

Conveyor line: Conveyor line is common chain, roller conveyor type and other types. When the door body is sprayed with plastic, it should be reasonably selected according to the size, weight and production scale of the door body. Before start-up, comprehensively check the chain, sprocket, motor and other mechanical transmission parts, add or replace the lubricant to ensure smooth transmission without abnormal sound. Calibrate the running speed of the conveyor line to ensure smooth and even movement of the door body. At the same time, check the electrical control system to ensure that the control buttons, sensors and other normal work, no short circuit, disconnection fault.

Workpiece on the piece

Remove the moisture on the surface of the door body: After the door body is washed and drained after pre-treatment, there may still be residual moisture. When preheating, the temperature rises so that the moisture evaporates. If moisture remains, spraying will prevent the powder coating from adhering, causing bubbles, pinholes and other problems in the coating, affecting the quality and adhesion of the coating.

Improve the adhesion of powder coating: The suitable preheating temperature changes the metal lattice structure on the surface of the door body and enhances its surface activity, which prompts the resin and other components in the powder coating to form chemical bonds with the surface of the door body better after spraying and greatly improves the adhesion between the powder coating and the door body to ensure that the coating is not easy to come off in the long term.

Promote the leveling of powder coating: After the door body is preheated to a suitable temperature, the powder coating sprayed can flow and spread more smoothly under the action of gravity and heat, filling the surface of the door body with minor bumps and making the coating more smooth and even, and improving the appearance of the door body with decorative and protective properties.

Pre-heating baking channel

Electrostatic adsorption principle: Electrostatic spraying machine utilizes high-voltage electrostatic generator to form a strong electrostatic field at the head of the spray gun. When the powder coating is sprayed from the spray gun, it will rub with the electrode inside the spray gun, making the powder particles take negative charge. And the grounded door body serves as the positive pole, under the action of electrostatic field, the negatively charged powder coating will move quickly to the surface of the door body, thus realizing uniform adsorption.

Equipment inspection and commissioning: Before formal spraying, the electrostatic spraying machine needs to be fully inspected and commissioned. Check whether the gun head is clogged, if so, need to be cleaned in time to ensure that the powder coating can be sprayed smoothly. Test whether the electrostatic generator of the spray gun is working properly. At the same time, debugging spraying machine powder supply system, check whether the powder coating pipeline is smooth, powder pump delivery should be adjusted according to the actual spraying demand, to ensure that the powder supply is uniform and stable.

Plastic spraying room

Remove the door frame/frame with primer baked and transfer it to the transfer area

Heating stage: Start the main oven heating system and raise the oven temperature to approx. 185°C at a rate of 5 - 10°C/minute. If the temperature rises too fast, the surface of the powder coating is easy to be cured first, and the solvent inside is difficult to evaporate, resulting in air bubbles and pinholes; if it is too slow, it will prolong the production cycle. When heating, the temperature control system monitors and adjusts the heating power according to the temperature change to ensure the temperature rises smoothly.

Holding phase: After the temperature inside the furnace reaches about 185℃, it enters the holding phase for about 15 minutes. During this period, the temperature is kept stable and the fluctuation is controlled within ±5℃. The hot air circulation system operates continuously to circulate the hot air to ensure that the door body is heated evenly. Insulation is used to allow the powder coating to fully melt, level and cross-link to form a hard coating film. Different powder coatings require different curing temperatures and times due to differences in chemical composition and properties, and should be operated according to the parameters of the coating supplier. Special functional coatings such as super weather resistant and high abrasion resistant coatings may require higher temperatures or longer holding times.

Curing oven/workpiece off-line

Transfer adhesive: Transfer adhesive is the key link between transfer paper and substrate, workers evenly apply transfer adhesive on the surface of door frame and door by brushing or roller coating.

Transfer area/workpiece on line

Transfer paper: transfer paper is a kind of special paper that can transfer the pre-printed pattern to the surface of other objects. Workers will print the heat transfer paper with wood grain pattern to fit closely on the surface of the door body, and trim it with a craftsman's knife.

The door frames and doors after the transfer paper is pasted continue to be hung on the assembly line.

Realize the pattern transfer: enter the high-temperature baking, in the high-temperature environment (generally 160 - 180 ℃) under the action of the disperse dye on the transfer paper will sublimate into the gas state. The gaseous dye molecules will pass through the tiny gap between the paper and the door body due to thermal movement, and diffuse and penetrate into the primer coating that has been sprayed on the surface of the door body. As the temperature drops, the gaseous dyes recondense into a solid state, permanently fixing the wood grain pattern to the door.

Curing baking channel

Remove the transfer paper attached to the surface of the door frame and door.

Remove the finished door frames and doors from the assembly line.

Transfer removal/workpiece offline

Selection and Preparation of Industrial Robots and Hanging Tools and Conveyor Lines

Industrial Robot: It is the key equipment of modern automated production. Through preset programs or real-time control, industrial robots can accurately perform handling tasks, greatly improving production efficiency and precision, reducing labor costs and human error.

Hooks: generally made of stainless steel or carbon steel, should have sufficient strength and rigidity, can withstand the weight of the door and not deformed. Before use, carefully check the hooks, support parts have no wear and tear, fracture, there are problems in time to repair or replace. In order to ensure good contact between the door body and the hooks, and to prevent problems with the coating, the surface of the hooks should be clean and dry, without oil and rust, and if necessary, degreased and descaled pre-treatment.

Conveyor line: Conveyor line is common chain, roller conveyor type and other types. When the door body is sprayed with plastic, it should be reasonably selected according to the size, weight and production scale of the door body. Before start-up, comprehensively check the chain, sprocket, motor and other mechanical transmission parts, add or replace the lubricant to ensure smooth transmission without abnormal sound. Calibrate the running speed of the conveyor line to ensure smooth and even movement of the door body. At the same time, check the electrical control system to ensure that the control buttons, sensors, etc. work properly without short-circuit and disconnection faults.

Manipulator loading

Pre-treatment assembly line: This assembly line is mainly composed of conveying system, spraying system and circulating filtration system. The principle is to use mechanical flushing to accelerate the chemical reaction, in the process of moving the door body with the conveying system, the spraying system will spray the treatment liquid evenly on the surface of the door body, reacting with the oil, rust and so on and flushing to remove. The circulating filtration system ensures that the treatment liquid is continuously clean and can be recycled.

Efficient production: automated continuous operation, the door body passes through each treatment process sequentially on the assembly line, which greatly shortens the treatment time, improves the production efficiency and meets the demand of mass production.

Stable quality: Precise control of treatment liquid concentration, temperature, spray pressure and other parameters, to avoid manual operation differences, to ensure that the surface treatment effect of each door body is consistent, and improve product quality stability.

Pre-treatment

Remove the moisture on the surface of the door body: After the door body is washed and drained after pre-treatment, there may still be residual moisture. When preheating, the temperature rises so that the water evaporates. If moisture remains, spraying will prevent the powder coating from adhering, causing bubbles, pinholes and other problems in the coating, affecting the quality and adhesion of the coating.

Improve the adhesion of powder coating: The suitable preheating temperature changes the metal lattice structure on the surface of the door body and enhances its surface activity, which prompts the resin and other components in the powder coating to form chemical bonds with the surface of the door body better after spraying and greatly improves the adhesion between the powder coating and the door body to ensure that the coating is not easy to come off in the long term.

Promote the leveling of powder coating: After the door body is preheated to a suitable temperature, the powder coating sprayed can flow and spread more smoothly under the action of gravity and heat, filling the slight bumps on the surface of the door body, making the coating more smooth and even, and improving the appearance of the door body's decorative and protective properties.

Pre-heating drying channel

Electrostatic adsorption principle: Electrostatic spraying machine utilizes high voltage electrostatic generator to form a strong electrostatic field at the head of the spray gun. When the powder coating is sprayed from the spray gun, it will rub with the electrode inside the spray gun, making the powder particles take negative charge. And the grounded door body serves as the positive pole, under the action of electrostatic field, the negatively charged powder coating will move quickly to the surface of the door body, thus realizing uniform adsorption.

Equipment inspection and commissioning: Before formal spraying, the electrostatic spraying machine needs to be fully inspected and commissioned. Check whether the gun head is clogged, if so, need to be cleaned in time to ensure that the powder coating can be sprayed smoothly. Test whether the electrostatic generator of the spray gun is working properly. At the same time, debugging spraying machine powder supply system, check whether the powder coating pipeline is smooth, powder pump delivery should be adjusted according to the actual spraying demand, to ensure that the powder supply is uniform and stable.

Automatic spray booth

Heating stage: Start the heating system of the main oven, and increase the temperature in the oven to about 185℃ at the rate of 5 - 10℃/minute. If the temperature rises too fast, the surface of the powder coating is easy to be cured first, and the solvent inside is difficult to evaporate, resulting in bubbles and pinholes; if it is too slow, it will prolong the production cycle. When heating, the temperature control system monitors and adjusts the heating power according to the temperature change to ensure the temperature rises smoothly.

Holding phase: After the temperature inside the furnace reaches about 185℃, it enters the holding phase for about 15 minutes. During this period, the temperature is kept stable and the fluctuation is controlled within ±5℃. The hot air circulation system operates continuously to circulate the hot air to ensure that the door body is heated evenly. Insulation is used to allow the powder coating to fully melt, level and cross-link to form a hard coating film. Different powder coatings require different curing temperatures and times due to differences in chemical compositions and properties, and should be operated according to the parameters of the coating supplier. Special functional coatings, such as super weather resistant and high abrasion resistant coatings, may require higher temperatures or longer holding times.

Curing oven

Selection and Preparation of Industrial Manipulators and Hanging Tools and Conveyor Lines

Industrial Robot: It is the key equipment for modern automated production. Through preset programs or real-time control, industrial robots can accurately perform handling tasks, greatly improving production efficiency and precision, reducing labor costs and human error.

Material receiver: It usually adopts special material rack or material box, and the material is mostly made of high-strength alloy steel or engineering plastics. The material frame should have a reasonable structural design, sufficient load-bearing capacity and stability to withstand the weight of the workpiece and not deformed. Before use, it is necessary to carry out a comprehensive inspection of the frame structure to see whether there are cracks, deformation and other conditions, and whether the connection parts are firm.

Mechanical Handling

Transfer adhesive: transfer adhesive is the key link connecting the transfer paper and the substrate, and it is evenly applied by the workers to the surface of the door frame and door by brushing and roller coating.

Transfer area

Transfer paper: transfer paper is a kind of special paper that can transfer the pre-printed pattern to the surface of other objects. Workers will tightly fit the heat transfer paper printed with wood grain pattern on the surface of the door body and trim it with a craft knife.

Selection and Preparation of Industrial Robots and Hangers and Conveyor Lines

Industrial Robot: It is the key equipment of modern automated production. Through preset programs or real-time control, industrial robots can accurately perform handling tasks, greatly improving production efficiency and precision, reducing labor costs and human error.

Hooks: generally made of stainless steel or carbon steel, should have sufficient strength and rigidity, can withstand the weight of the door and not deformed. Before use, carefully check the hooks, support parts have no wear and tear, fracture, there are problems in time to repair or replace. In order to ensure good contact between the door body and the hooks, and to prevent problems with the coating, the surface of the hooks should be clean and dry, without oil and rust, and if necessary, degreased and descaled pre-treatment.

Conveyor line: Conveyor line is common chain, roller conveyor type and other types. When the door body is sprayed with plastic, it should be reasonably selected according to the size, weight and production scale of the door body. Before start-up, comprehensively check the chain, sprocket, motor and other mechanical transmission parts, add or replace the lubricant to ensure smooth transmission without abnormal sound. Calibrate the running speed of the conveyor line to ensure smooth and even movement of the door body. At the same time, check the electrical control system to ensure that the control buttons, sensors and other normal work, no short circuit, circuit breakers.

Robot Handling

Realize pattern transfer: enter the high temperature baking, under the action of high temperature environment (generally 160 - 180℃), the disperse dye on the transfer paper will sublimate into gaseous state . The gaseous dye molecules will pass through the tiny gap between the paper and the door body due to thermal movement, and diffuse and penetrate into the primer coating that has been sprayed on the surface of the door body. As the temperature drops, the gaseous dyes recondense into a solid state, permanently fixing the wood grain pattern to the door.

Phosphate pool role

Selection and preparation of industrial robots and hangers and conveyor lines

Industrial robots: it is the key equipment for modern automated production. Through preset programs or real-time control, industrial robots can accurately perform handling tasks, greatly improving production efficiency and precision, reducing labor costs and human error.

Transfer Removal / Workpiece Unloading

The transfer paper attached to the surface of the door frame and door leaf is removed.

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