Powder spraying door and manufacturing process thereof

Abstract

The invention relates to the technical field of door body preparation, in particular to a powder spraying door and a manufacturing process thereof. The manufacturing process of the powder spraying door comprises the following steps that S1, a plate made of a first material is machined into base plates, a plate made of a second material is machined into an outer frame and a surface plate, a foundation frame is defined by the multiple base plates, a perforated plate is arranged in the foundation frame, the periphery of the foundation frame is wrapped with the outer frame, and a middle frame is obtained; a plurality of first air holes are formed in the middle frame, and the first air holes penetrate through the porous plate, the base plate and the outer frame; s2, after glue is applied to the surface of the middle frame, the surface boards are subjected to hot pressing on the two faces of the middle frame, and blank boards are obtained; and S3, the blank plate is subjected to edge sealing and powder spraying, and the powder spraying door is obtained. By adjusting the overall structure, the attaching procedure and the edge sealing procedure of the powder spraying door, the edge portion of the door body cannot have protruding marks after powder spraying and heating.

Description

Technical Field

[0001] The invention relates to the technical field of door body preparation, and in particular to a powder spraying door and a manufacturing process thereof. Background Art

[0002] The investigation found that the powder-sprayed door products currently on the market usually have the following problems on the edges of the door leaf: Figure 1 The mark shown at A in the middle makes the overall appearance of the door leaf product unsightly.

[0003] It has been verified that the formation of the above marks is mainly related to the three-layer structure of the door leaf and the selected bonding glue:

[0004] ① The current powder-coated doors usually have a double-sided surface panel + middle frame structure, in which the surface panel is generally made of fiberboard, and the middle frame is made of LVL (laminated veneer lumber). Due to the different materials of the surface and middle layers, during the powder-coating process, the different expansion and contraction rates of the panels when heated can easily lead to uneven edges of the door leaf, resulting in marks.

[0005] ② The glue used for bonding the surface fiberboard and the middle frame is usually a cold-pressed single-component water-based glue. This type of glue needs to be diluted with water to adjust the viscosity, and the moisture content is generally around 60%. After bonding, the moisture in the glue is basically absorbed by the surface fiberboard. After the surface board absorbs water, the conductivity increases, resulting in better powdering around the bonding seam, and the powder layer is prone to bulge, making the imprint more obvious. Summary of the invention

[0006] The main purpose of the present invention is to provide a powder-sprayed door and a manufacturing process thereof, aiming to improve the technical problem of marks on the edges of existing powder-sprayed door leaf products.

[0007] To achieve the above object, the present invention proposes a manufacturing process for a powder spraying door, comprising the following steps:

[0008] S1. Processing a plate of a first material into a substrate, processing a plate of a second material into an outer frame and a surface plate, enclosing a plurality of the substrates into a basic frame, arranging a porous plate in the basic frame, covering the outer frame around the basic frame to obtain an intermediate frame, and opening a plurality of first air holes on the intermediate frame, wherein the first air holes penetrate the porous plate, the substrate and the outer frame;

[0009] S2. After applying glue to the surface of the intermediate frame, hot pressing the surface plate on both sides of the intermediate frame to obtain a embryonic plate;

[0010] S3. The embryonic board is edge-sealed and then powder-sprayed to obtain the powder-sprayed door.

[0011] Preferably, in step S1, the board made of the first material is a LVL board, and the board made of the second material is a fiberboard.

[0012] Preferably, in step S1, the first air holes are provided on both sides of the middle frame, and the distribution density of the first air holes is 4-6 / m 2 , the aperture of the first air vent is 1-3 mm.

[0013] Preferably, in step S1, the porous plate comprises a first porous plate, a second porous plate and a third porous plate which are sequentially arranged from top to bottom, and the density of the first porous plate, the second porous plate and the third porous plate increases gradually from small to large;

[0014] The first porous plate is provided with a plurality of first through holes extending along its length direction, the second porous plate is provided with a plurality of second through holes extending along its length direction, and the third porous plate is provided with a plurality of third through holes extending along its length direction. The apertures of the first through holes, the second through holes and the third through holes decrease gradually from small to large.

[0015] Preferably, the density of the first porous plate is 0.3-0.45 g / cm 2 The density of the second porous plate is 0.48-0.5 g / cm 2 The density of the third porous plate is 0.55-0.65 g / cm 2 ;

[0016] The aperture of the first through hole is 0.8-1 mm, the aperture of the second through hole is 0.5-0.7 mm, and the aperture of the third through hole is 0.2-0.4 mm.

[0017] Preferably, in step S2, the pressure during hot pressing is 8-15 MPa, the hot pressing temperature is 80-120° C., and the hot pressing time is 2-10 min.

[0018] Preferably, in step S2, the glue is PUR glue, and the coating amount of the PUR glue is 80-120 g / m 2 .

[0019] Preferably, in step S3, the edge sealing step comprises: wrapping the outer frame again around the embryonic board, the outer frame having a plurality of second air holes, and the second air holes are connected to the first air holes.

[0020] Preferably, in step S3, after the edge of the embryonic board is sealed, UV coating is first applied to the edge of the embryonic board, and then a powder spraying process is performed;

[0021] The powder spraying step comprises: preheating the embryo plate to a plate surface temperature of 70-100° C., and then performing electrostatic powder spraying with a powder spraying thickness of 50-100 μm.

[0022] In addition, the present invention also provides a powder spraying door, which is manufactured by any of the manufacturing processes for the powder spraying door described above.

[0023] Compared with the prior art, the powder-sprayed door and its manufacturing process of the present invention have the following beneficial effects: by adjusting the overall structure of the powder-sprayed door, the bonding process and the edge sealing process, no raised marks will appear on the edge of the door body after powder spraying and heating.

[0024] 1. The base plate is used to form a hollow basic frame. The inside of the basic frame is provided with a porous plate. The outside of the basic frame is provided with an outer frame of the same material as the surface plate. The upper and lower sides are then hot-pressed to fit the surface plate. Since the first air hole is provided on the middle frame, it is convenient for the internal gas to be discharged during heating. The porous plate is used to fill the basic frame to ensure the surface plate fits well, and it is convenient for the internal gas to circulate and exhaust after the door leaf is closed. In addition, the basic frame is covered by the outer frame. The material of the outer frame is consistent with that of the surface plate. After the door leaf is formed, all the external panels are made of fiberboard of the same material, which ensures that the expansion and contraction rate of the edges of the panels is consistent during the powder spraying and heating process. The internal gas can be easily discharged, solving the problem of the middle frame being offset due to the pressure difference between the inside and the outside.

[0025] 2. Use 100% solid content PUR glue during hot pressing to prevent the moisture content at the junction of the surface plate and the middle frame from changing significantly, thus avoiding marks during subsequent powder spraying due to differences in conductivity.

[0026] 3. In order to ensure the smoothness of the edge of the powder-coated door after edge sealing, an outer frame is used to seal the edge, changing the edge from a three-layer structure to a one-layer structure, further reducing the imprint problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a real picture of a traditional powder-sprayed door, where the arrow at A points to the mark on the edge;

[0029] Figure 2 It is a schematic diagram of the cross-sectional structure of the powder spraying door of the present invention when the middle frame and the surface plate are not attached;

[0030] Figure 3 It is a schematic diagram of the cross-sectional structure of the powder spraying door of the present invention after the middle frame and the surface plate are bonded together.

[0031] In the accompanying drawings: 1-base plate, 2-outer frame, 21-first air vent, 3-surface plate, 4-base frame, 5-porous plate, 6-middle frame.

[0032] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] like Figures 2 to 3 As shown, a manufacturing process of a powder spraying door includes the following steps:

[0036] S1. Processing a plate of a first material into a substrate 1, processing a plate of a second material into an outer frame 2 and a surface plate 3, a plurality of the substrates 1 enclose a basic frame 4, arranging a porous plate 5 in the basic frame 4, covering the outer frame 2 around the basic frame 4 to obtain an intermediate frame 6, and opening a plurality of first air holes 21 on the intermediate frame 6, wherein the first air holes 21 penetrate the porous plate 5, the substrate 1 and the outer frame 2;

[0037] S2. After applying glue to the surface of the intermediate frame 6, hot pressing the surface plate 3 on both sides of the intermediate frame 6 to obtain a embryonic plate;

[0038] S3. The embryonic board is edge-sealed and then powder-sprayed to obtain the powder-sprayed door.

[0039] The present invention adjusts the traditional door leaf structure. First, the base plate 1 is used to enclose a rectangular basic frame 4 with a hollow interior. A porous plate 5 (which can be a conventional bridge hole mechanical plate) is provided inside the basic frame 4. The four outer frames 2 are provided with outer frames 2 of the same material as the surface plate 3 on all four sides of the outside of the basic frame 4. The four outer frames 2 cover the basic frame 4 to form an intermediate frame 6. The intermediate frame 6 of the same material is hot-pressed and bonded to the upper and lower surface plates 3 to obtain a blank plate, and then edge sealing and powder spraying are performed to obtain a finished powder-sprayed door. Since the outer frame 2 outside the intermediate frame 6 is made of the same material as the surface plate 3, the edge mark problem caused by the different thermal expansion and contraction rates of the three layers of the traditional powder-sprayed door is solved.

[0040] In actual operation, the manufacturing process of the powder spraying door of the present invention includes the following steps:

[0041] ①Material preparation: prepare the required materials according to the molding size of the wooden door;

[0042] ② Frame making: Use a first material board (which can be an LVL board) to cut and nail into a rectangular basic frame 4 according to the forming size, and the outer frame 2 is cut from a second material board (which can be a fiberboard) of about 22mm, wherein the moisture content of the second material board is controlled as much as possible within 8%-12%. On the one hand, after the middle frame 6 is completed, multiple first air holes 21 are opened at a certain distance on both sides of it (the first air holes 21 are preferably opened at the upper and lower horizontal frames of the entire door of the powder spraying door) to facilitate the discharge of internal gas during heating; on the other hand, the base frame 4 is filled with a bridge hole mechanical board with a surface groove to ensure that the surface board 3 fits, and at the same time facilitates the internal gas circulation and exhaust after the door leaf is closed. After this process is completed, the base frame 4 is covered inside by the outer frame 2, and the material of the outer frame 2 is consistent with that of the surface board 3, that is, after the door leaf is formed, all the external boards are fiberboards of the same material, ensuring that the expansion and contraction rate of the edges of the boards during the powder spraying heating process is consistent, and the internal gas can be easily discharged, solving the problem of the middle frame being offset due to the internal and external pressure difference.

[0043] ③ Hot pressing surface plate 3: first place a surface plate 3 (which can be a fiberboard) of about 9 mm on the table of the hot press, use a glue roller to apply glue on the surface of the fiberboard, cover it with a middle frame 6 after gluing, and then cover another surface plate 3 coated with glue on the frame to obtain a blank plate.

[0044] ④Cut the hot-pressed embryonic board into the required size, and then carry out the edge sealing and powder spraying processes in sequence, remembering the finished powder-sprayed door of this plan.

[0045] Furthermore, in step S1, the board made of the first material is a LVL board, and the board made of the second material is a fiberboard.

[0046] Laminated veneer lumber, abbreviated as LVL board, is a board made of multiple layers of whole or spliced ​​veneers glued together along the grain. The LVL board used in the base plate 1 / base frame 4 has the following advantages: 1. Uniform structure and good dimensional stability. The layered structure of LVL greatly reduces the possibility of defects such as warping and torsion in the board, and has good stability and small deformation. 2. High strength, it is a material with a very high strength-to-weight ratio and has uniform structural characteristics. 3. Low cost and a wide range of raw materials. The outer frame 2 and the surface plate 3 can be made of fiberboard, which has suitable strength, stable quality, and certain anti-deformation and anti-corrosion capabilities.

[0047] In addition to the above two materials, in other embodiments, the board of the first material or the board of the second material may also be a synthetic board of other materials or directly a solid wood board.

[0048] Furthermore, in step S1, the first air holes 21 are provided on both sides of the middle frame 6, and the distribution density of the first air holes 21 is 4-6 / m 2 The diameter of the first air vent 21 is 1-3 mm.

[0049] In this embodiment, the number and diameter of the first air holes 21 are reasonably set to facilitate better discharge of the gas in the middle frame 6.

[0050] Further, in step S1, the porous plate 5 includes a first porous plate, a second porous plate and a third porous plate which are sequentially distributed from top to bottom, and the density of the first porous plate, the second porous plate and the third porous plate increases gradually from small to large;

[0051] The first porous plate is provided with a plurality of first through holes extending along its length direction, the second porous plate is provided with a plurality of second through holes extending along its length direction, and the third porous plate is provided with a plurality of third through holes extending along its length direction. The apertures of the first through holes, the second through holes and the third through holes decrease gradually from small to large.

[0052] In this embodiment, in addition to the conventional bridge hole mechanical plate, the porous plate 5 can also be a three-layer structure porous plate 5 with different densities and apertures. Among them, the density of the first porous plate, the second porous plate and the third porous plate gradually increases from top to bottom, and the apertures of the first through hole, the second through hole and the third through hole gradually decrease from top to bottom. The porous plate 5 with the above structure is conducive to the uniform transfer of heat inside the middle frame 6 during the heating process after powder spraying. At the same time, the gas generated by the substrate 1 and the porous plate 5 due to heating will be evenly dispersed in the three-layer structure porous plate 5, so that the expansion and contraction degree of the substrate 1 / basic frame 4 inside the middle frame 6 is more uniform when heated, and the quality of the powder spraying door product obtained is better.

[0053] Furthermore, the density of the first porous plate is 0.3-0.45 g / cm 2 The density of the second porous plate is 0.48-0.5 g / cm 2 The density of the third porous plate is 0.55-0.65 g / cm 2 ;

[0054] The aperture of the first through hole is 0.8-1 mm, the aperture of the second through hole is 0.5-0.7 mm, and the aperture of the third through hole is 0.2-0.4 mm.

[0055] When the parameters of the three-layer structure porous plate 5 are set to the above range, the expansion and contraction degree of the substrate 1 / basic frame 4 inside the middle frame 6 when heated is most uniform, and the quality of the powder spraying door product obtained is relatively the best.

[0056] Furthermore, in step S2, the pressure during hot pressing is 8-15 MPa, the hot pressing temperature is 80-120° C., and the hot pressing time is 2-10 min.

[0057] In this example, during the hot pressing process, the pressure is set to 8-15Mpa, the hot pressing time is 2-10min, and the hot pressing temperature is 80-120℃, to ensure that the glue softens evenly and the surface plate 3 and the middle frame 6 are more closely fitted. After the hot pressing is completed, it can be cured for 12-48 hours to fully release the stress inside the embryo plate and reduce the risk of subsequent deformation.

[0058] Furthermore, in step S2, the glue is PUR glue, and the coating amount of the PUR glue is 80-120 g / m 2 In this embodiment, PUR glue with 100% solid content is used, and the glue coating amount is 80-120g / m 2 PUR glue is called moisture-curing reactive polyurethane hot melt adhesive, and its main component is terminal isocyanate polyurethane prepolymer, which is a single component. In this way, the moisture content at the junction of the surface plate 3 and the middle frame 6 will not change significantly, avoiding the appearance of marks during subsequent powder spraying due to different conductivity. That is, by optimizing the bonding process of the surface plate 3, the problem of local uneven moisture content inside the powder spraying door is solved, further ensuring that there is no mark on the edge of the final powder spraying door product.

[0059] Furthermore, in step S3 , the edge sealing step includes: wrapping the outer frame 2 around the embryonic board again, the outer frame 2 is provided with a plurality of second air holes, and the second air holes are connected to the first air holes 21 .

[0060] In this embodiment, when too thin edge sealing material is used, the edge may still have slight marks due to the arrangement direction of the fiberboard during the subsequent powder spraying and heating. In order to ensure that the edge is absolutely flat and smooth, the present invention uses a sufficiently thick outer frame 2 to seal the edge again; during actual installation, a fiberboard with a thickness of about 12 mm is used in combination with PUR glue to change the edge from a three-layer structure to a one-layer structure, and the amount of PUR glue applied is 120-180g / m 2 .

[0061] Note: Powder spraying door products all need hanging holes. The first air hole 21 / second air hole of the present invention also serves as a hanging hole and needs to be covered with a decorative cover after powder spraying. The hanging hole is a support point for hanging the object to be sprayed on the brushing stand or spraying equipment to maintain the stability and fixity of the object during the spraying process.

[0062] In summary, this solution provides a powder-sprayed door and a manufacturing process thereof, and by adjusting the overall structure, bonding process and edge sealing process of the powder-sprayed door, no raised marks will appear on the edge of the door body after powder spraying and heating.

[0063] Furthermore, in step S3, after the edge of the embryonic board is sealed, UV coating is first applied to the edge of the embryonic board, and then a powder spraying process is performed; the powder spraying step includes: preheating the embryonic board to a board surface temperature of 70-100°C, and then electrostatic powder spraying with a powder spraying thickness of 50-100μm.

[0064] In this embodiment, UV coating is applied by roller coating on the edge of the embryo board after edge sealing to ensure that the edge is flat and smooth after coating, which can improve the moisture-proof performance of the powder-sprayed door product. The film thickness of the UV coating is about 0.25 mm.

[0065] In the powder spraying step, the embryonic board is first preheated to raise the temperature of the board surface to 70-100°C, and then powder spraying is carried out. The thickness of the powder spraying layer is 50-100μm, and finally it is melted and solidified at high temperature.

[0066] In addition, the present invention further provides a powder spraying door 4, which is manufactured by any of the above-mentioned manufacturing processes of the powder spraying door 4. The powder spraying door 4 is manufactured by any of the above-mentioned manufacturing processes of the powder spraying door, that is, the powder spraying door 4 has the same beneficial effects as above, which will not be repeated here.

[0067] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only used to explain the present invention, and are not used to limit the present invention.

[0068] Comparative Example 1

[0069] Conventional powder-coated door: adopts the structure of double-sided surface board (fiberboard) + middle layer frame (LVL board).

[0070] Comparative Example 2

[0071] A manufacturing process for a powder spray door comprises the following steps:

[0072] S1. Process the plate of the first material into a substrate 1, and process the plate of the second material into an outer frame 2 and a surface plate 3. Multiple substrates 1 are enclosed into a basic frame 4, and a porous plate 5 (density 0.35g / cm 2 The bridge hole mechanical plate, the size of each through hole is consistent, and the diameter is 0.8mm), and the outer frame 2 is wrapped around the base frame 4 to obtain the intermediate frame 6;

[0073] S2. Apply melamine glue on the surface of the middle frame 6, with a coating amount of 100g / m 2, and then hot-pressing the surface plate 3 on both sides of the middle frame 6 to obtain a blank plate, wherein the pressure during hot pressing is 18 MPa, the hot pressing temperature is 125° C., and the hot pressing time is 5 min;

[0074] S3. Use conventional paper edge banding strips to seal the edges of the embryo board, and then preheat the embryo board to a board surface temperature of 90°C for electrostatic powder spraying with a powder spraying thickness of 60 μm to obtain a powder sprayed door.

[0075] Example 1

[0076] All preparation steps in this embodiment are consistent with those in comparative example 2, with the only difference being that in step S1, five first air holes 21 are spaced apart on both sides of the middle frame 6, the aperture of the first air holes 21 is 3 mm, and the first air holes 21 pass through the porous plate 5, the substrate 1 and the outer frame 2.

[0077] Example 2

[0078] The various preparation steps in this embodiment are consistent with those in Embodiment 1, with the only difference being that in step S2 , PUR glue is applied on the surface of the middle frame 6 in this embodiment.

[0079] Example 3

[0080] All preparation steps in this embodiment are consistent with those in Embodiment 1, with the only difference being that in step S2, the parameters of hot pressing in this embodiment are adjusted to: hot pressing pressure 12 MPa, hot pressing temperature 110° C., and hot pressing time 5 min.

[0081] Example 4

[0082] The preparation steps in this embodiment are consistent with those in embodiment 1, except that: this embodiment uses an outer frame (i.e., fiberboard) with a second vent hole to cover the periphery of the embryo board with PUR glue for edge sealing, and the amount of PUR glue applied is 150g / m 2 .

[0083] Example 5

[0084] The preparation steps in this embodiment are consistent with those in Embodiment 1, except that the porous plate in this embodiment is adjusted, as shown in the following table:

[0085]

[0086]

[0087] The powder spray doors prepared in Examples 1-5 and Comparative Examples 1-2 were subjected to performance tests, and the specific test results are shown in the following table:

[0088] Number of powder-sprayed doors with marks / sash Yield Comparative Example 1 47 6％ Comparative Example 2 42 16％ Example 1 20 60％ Example 2 12 76％ Example 3 15 70％ Example 4 4 92％ Example 5-1 16 68％ Example 5-2 16 68％ Example 5-3 18 64％ Example 5-4 9 82％

[0089] Note: 50 powder-sprayed door products were prepared using the preparation steps of the above embodiment and comparative example, and the finished powder-sprayed door products were observed to see whether there were marks on the edges, and the total number of products with marks was recorded. Among them, the yield rate = (the number of powder-sprayed doors without marks on the edges / the total number of powder-sprayed doors) × 100%

[0090] From the test results in Example 1 in the above table, it can be seen that the edges of the powder-sprayed door products with conventional structures are prone to marks after powder spraying and heating, which seriously affects the appearance of the powder-sprayed door products. After the structure is adjusted, when the first air vent is not opened, as shown in the test results of Example 2, even if the outer frame completely covers the internal porous plate and the basic frame, the marks are reduced, but because the internal gas cannot be discharged at all, the middle frame expands during the powder spraying and heating process, and the pressure difference between the inside and the outside causes the middle frame to shift and produce a certain deformation. There is still inconsistency with the expansion and contraction rate of the upper and lower surface plates, so the yield rate improvement effect is still not obvious.

[0091] It can be seen from the test results of Example 1 that when the first air vent is provided, the gas inside the middle frame can be discharged in time, the imprint problem on the edge of the powder spraying door is significantly reduced, and the yield rate can be increased to about 60%.

[0092] It can be seen from the test results of Example 2 that when the preferred PUR glue is selected for hot pressing on the basis of Example 1, the moisture content will not change significantly due to the lower solid content, the imprint on the edge of the powder-sprayed door can be further reduced, and the yield rate can be increased to about 76%.

[0093] It can be seen from the test results of Example 3 that when the preferred hot pressing parameters are adopted on the basis of Example 1, the glue can be softened evenly and the yield rate of the powder-sprayed door can be improved.

[0094] It can be seen from the test results of Example 4 that when the outer frame is used to seal the entire embryo board once on the basis of Example 1, the edge of the entire powder spray door changes from a three-layer structure to a one-layer structure, which can reduce the imprint problem of the edge of the powder spray door as much as possible, and the yield rate can be increased to about 90%. However, due to the glue, hot pressing parameters and porous plate used in the middle frame, the gas dispersion inside the middle frame is not uniform during the powder spray heating process, which will affect the outermost edge sealing outer frame and cause it to deviate slightly. The joints of multiple outer frames around the embryo board will be slightly uneven, so the yield rate has not yet reached 100%.

[0095] It can be seen from the test results of Example 5 that when three layers of porous plates with different pore sizes and densities are selected on the basis of Example 1, the gas in the middle frame is evenly dispersed and the imprint problem on the edge of the powder spraying door is reduced.

[0096] Example 6

[0097] A manufacturing process for a powder spray door comprises the following steps:

[0098] S1. The LVL board is processed into a substrate 1, and the fiberboard is processed into an outer frame 2 and a surface plate 3. A plurality of the substrates 1 are enclosed into a basic frame 4, a porous plate 5 is arranged in the basic frame 4, and the outer frame 2 is covered around the basic frame 4 to obtain an intermediate frame 6, and six first air holes 21 (the aperture of the first air holes 21 is 3 mm) are opened on the intermediate frame 6, and the first air holes 21 pass through the porous plate 5, the substrate 1 and the outer frame 2;

[0099] The porous plate 5 includes a first porous plate, a second porous plate and a third porous plate, which are arranged in sequence from top to bottom. The density of the first porous plate, the second porous plate and the third porous plate increases gradually from small to large. The density of the first porous plate is 0.4 g / cm 2 The diameter of the first through hole of the first porous plate is 0.8 mm; the density of the second porous plate is 0.48 g / cm 2 The diameter of the second through hole is 0.6 mm; the density of the third porous plate is 0.6 g / cm 2 , the aperture of the third through hole is 0.3 mm;

[0100] S2. Apply PUR glue (the glue amount is 100g / m 2 ), hot pressing the surface plate 3 on both sides of the middle frame 6 to obtain a blank, wherein the pressure during hot pressing is 12Mpa, the hot pressing temperature is 115°C, and the hot pressing time is 6min;

[0101] S3. The outer frame 2 containing the second air holes (the aperture is consistent with the first air holes 21) is wrapped around the embryo plate for edge sealing, and then the embryo plate is preheated to a plate surface temperature of 90°C and electrostatic powder spraying is performed with a powder spraying thickness of 80 μm to obtain a powder sprayed door.

[0102] The powder spraying door prepared in Example 6 was subjected to performance testing, and the specific test results are shown in the following table:

[0103] Number of powder-coated doors with marks / sash Yield Example 6 0 100％

[0104] It can be seen from the test results in the above table that by further optimizing the glue, hot pressing parameters, edge sealing process and porous plate settings used in hot pressing lamination, the problem of imprints on the edges of powder-sprayed doors can be basically avoided, the yield rate is high, and the powder-sprayed doors are more harmonious as a whole and have a better appearance.

[0105] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A manufacturing process for a powder spray door, characterized in that: The steps include: S1. Processing a plate of a first material into a substrate (1), processing a plate of a second material into an outer frame (2) and a surface plate (3), enclosing a plurality of the substrates (1) into a basic frame (4), arranging a porous plate (5) in the basic frame (4), covering the outer frame (2) around the basic frame (4) to obtain an intermediate frame (6), and providing a plurality of first air holes (21) on the intermediate frame (6), wherein the first air holes (21) penetrate the porous plate (5), the substrate (1) and the outer frame (2); S2. After applying glue on the surface of the intermediate frame (6), the surface plate (3) is hot-pressed on both sides of the intermediate frame (6) to obtain a embryonic plate; S3. The embryonic board is edge-sealed and then powder-sprayed to obtain the powder-sprayed door.

2. A manufacturing process for a powder spray door according to claim 1, characterized in that: In step S1, the first material board is a LVL board, and the second material board is a fiberboard.

3. The manufacturing process of a powder spraying door according to claim 1, characterized in that: In step S1, the first air holes (21) are provided on both sides of the middle frame (6), and the distribution density of the first air holes (21) is 4-6 / m 2 The diameter of the first air vent (21) is 1-3 mm.

4. A manufacturing process for a powder spray door according to claim 1 or 3, characterized in that: In step S1, the porous plate (5) comprises a first porous plate, a second porous plate and a third porous plate which are sequentially arranged from top to bottom, and the density of the first porous plate, the second porous plate and the third porous plate increases gradually from small to large; The first porous plate is provided with a plurality of first through holes extending along its length direction, the second porous plate is provided with a plurality of second through holes extending along its length direction, and the third porous plate is provided with a plurality of third through holes extending along its length direction. The apertures of the first through holes, the second through holes and the third through holes decrease gradually from small to large.

5. A manufacturing process for a powder spray door according to claim 4, characterized in that: The density of the first porous plate is 0.3-0.45 g / cm 2 The density of the second porous plate is 0.48-0.5 g / cm 2 The density of the third porous plate is 0.55-0.65 g / cm 2 ; The aperture of the first through hole is 0.8-1 mm, the aperture of the second through hole is 0.5-0.7 mm, and the aperture of the third through hole is 0.2-0.4 mm.

6. The manufacturing process of a powder spraying door according to claim 1, characterized in that: In step S2, the pressure during hot pressing is 8-15 MPa, the hot pressing temperature is 80-120° C., and the hot pressing time is 2-10 min.

7. The manufacturing process of a powder spraying door according to claim 1, characterized in that: In step S2, the glue is PUR glue, and the coating amount of the PUR glue is 80-120g / m 2 .

8. The manufacturing process of a powder spraying door according to claim 1, characterized in that: In step S3, the edge sealing step includes: wrapping the outer frame (2) again around the embryonic plate, the outer frame (2) is provided with a plurality of second air holes, and the second air holes are connected to the first air holes (21).

9. The manufacturing process of a powder spraying door according to claim 1, characterized in that: In step S3, after the edge of the embryo board is sealed, UV coating is first applied to the edge of the embryo board, and then a powder spraying process is performed; The powder spraying step comprises: preheating the embryo plate to a plate surface temperature of 70-100° C., and then performing electrostatic powder spraying with a powder spraying thickness of 50-100 μm.

10. A powder spraying door, characterized in that: The powder spray door is manufactured by the manufacturing process of any one of claims 1 to 9.

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