A wooden door manufacturing process

Abstract

The invention discloses a wooden door manufacturing technology. The wooden door manufacturing technology comprises the steps that a base board and a wooden door core portion are sawn and cut, hot press molding is conducted, stress balancing is conducted, engraving and milling are conducted, fixed-thickness sanding, bottom paint and surface paint coating and drying, fine sanding and polishing are conducted on the surface of a door blank through a line-surface contacting method. According to a wooden door manufactured through the method, strip-shaped sanding lines left on a surface coating of the wooden door are eliminated, visual recessed portions are avoided, the brightness of a film of the product is high, and a roller mark is avoided. According to the method, the production process is more environmentally friendly and free of emission, the light curing technology is adopted in the production process, the drying time is shortened, the edge banding technology that technological steps are reserved on a PVC edge banding band is adopted in the periphery of the door blank, and the technological level of edge paint film forming of the periphery of the door blank is improved.

Description

technical field [0001] The invention relates to the technical field of molding processing of wooden doors, door casings, dumb openings, and artistic dumb openings with high-density boards HDF, MDF, and particle boards as substrates. Specifically, it relates to a wooden door molding processing and surface coating processing system technology. Background technique [0002] Painted wooden doors with high-density board HDF, MDF, and particle board as substrates are now commonly used in the following ways to complete the molding process of product wooden doors: [0003] 1. Apply the two-component polyurethane primer and topcoat (PU primer, topcoat) to the surface of the wooden door with HDF, MDF or particle board as the substrate by manual, electrostatic, vacuum spraying, machine spraying, etc. Baseboard veneer. During this period, the PU primer and topcoat film coated on the surface of the wooden door are dried successively by surface drying at room temperature and heating and ...

AI Technical Summary

Problems solved by technology

In the process of large-scale production, there is a lack of synchronization ability with other processing procedures such as wooden door planting, hot pressing, edge banding, and hole arrangement;

[0005] (2) Harmful to health and pollute the environment, especially the artificial spraying method;

[0006] (3) The surface coating of the product is poor in corrosion resistance, yellowing resistance, ultraviolet radiation resistance, wear resistance and scratch resistance, especially the pure white PU paint film is still prone to loss of light and powder. Chemical and yellowing problems will affect the service life of the product;

[0007] (4) It does not have the ability to paint large-scale heterochromatic layers around the periphery;

[0008] (5) The cost is high. The current material cost of double-sided PU primer and topcoat on the surface of the wooden door is about 28.00--32.00 yuan per square meter

[0017] (1) The double-sided hot-pressing balance period is long, and the drying speed of the paint film is slow;

[0018] (2) Harmful to health and pollute the environment, especially the artificial spraying method;

[0019] Before painting, the melamine and urea-formaldehyde glue-impregnated paper pressed on the surface of the wooden door needs to be manually machine-sanded for coarse grinding, manual fine-grinding and manual machine-sanded fine grinding, which results in a large amount of dust and is labor-intensive and time-consuming;

[0020] (3) The surface coating of the product is poor in corrosion resistance, yellowing resistance, ultraviolet radiation resistance, wear resistance and scratch resistance, especially the pure white PU paint film is still prone to loss of light and powder. Chemical and yellowing problems will affect the service life of the product;

[0021] (4) The ability to produce fine products is weak, and there are generally quality problems such as black glue lines on the back of the finished wooden door, manual edge scraping, edge rubbing, greasy filling, color repair marks, and "sharp" thorns around the edge of the wooden door;

[0022] (5) The cost is relatively high. The cost of the finished product on both sides of the wooden door is between 19.00-24.00 yuan / square meter.

[0024] (1) Pollution of the environment, urea-formaldehyde adhesives and other adhesives release free formaldehyde to the outside; NC paint contains VOC, TDI, toluene and xylene, heavy metals, odors, dust and other volatile substances and other solid pollutants; it constitutes a pollution source of the natural environment , endangering human health; increasing the load on clean water resources;

[0025] (2) The pressing molding and heat balance process are relatively complicated;

[0026] (3) The drying speed of the paint film is slow

Second, it is easy to cause slight pollution to the surface environment

Otherwise, after the PVC edge banding of a different color from the surface coating of the wooden door is sealed around the perimeter and painted, the peripheral edges of the finished product are prone to thorny "sharp" problems, and the surface coating of the wooden door is different from the surrounding edge banding. Leakage defects can also occur at junctions between layer phase boundaries

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