Composite multi-layer plywood processing method capable of reducing cracks

Abstract

The invention discloses a composite multi-layer plywood processing method capable of reducing cracks, a pair of outer surface plates and a pair of inner core plates are included, the pair of inner core plates are located between the pair of outer surface plates, the purpose of preventing the plywood from cracking is achieved by arranging anti-cracking assemblies in a matrix mode and combining variable nails, and when the composite multi-layer plywood is heated to expand, the composite multi-layer plywood is not prone to cracking. During low-temperature cold contraction, a part of the outer surface plate bulges and drives the variable nails to move to pull open the composite film, so that the mixed glue solution flows out and is combined with the variable nails to adhere and fill the space between the outer surface plate and the inner core plate, and therefore, the bulge is prevented from being extruded and cracked due to stress, and during low-temperature cold contraction, the outer surface plate is sunken to enable the variable nails to move to pierce the composite film; and meanwhile, the mixed glue solution flows out and fills the space between the outer surface plate and the inner core plate, the outer surface plate is prevented from being stressed to crack, and when the outer surface plate cracks, the mixed glue solution can flow to a crack to conduct adhesion remediation on the cracking position, so that the cracking of the composite multilayer plywood is effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of plywood preparation, and more particularly to a composite multi-layer plywood processing method capable of reducing cracking. Background Art

[0002] Plywood, also known as multi-layer board, plywood or multi-layer plywood, is a man-made board made of three or more layers of veneer or thin wood glued together by hot pressing. It is one of the commonly used materials in furniture manufacturing, construction and decoration industries.

[0003] Composite multi-layer plywood is a wood board with a complex structure. It is made up of multiple layers of thin wood veneers stacked crosswise, and the grain direction of each layer of wood veneer is usually perpendicular to each other. This cross-stacking structure gives plywood extremely high strength and stability, making it widely used in construction, furniture manufacturing, shipbuilding, packaging and other fields.

[0004] However, when the existing composite multi-layer plywood is heated or subjected to impact and extrusion, it may expand locally to form bulges, and it is very easy to crack when subjected to a slight external force. When it is damp and swollen, it may also crack like being squeezed. In a low temperature environment, due to the low temperature, the board surface may shrink, the board surface may be partially dented, or the board surface may be subjected to local pressure and other situations, which may also cause cracking.

[0005] Therefore, in view of the above technical problems, it is necessary to provide a composite multi-layer plywood processing method that can reduce cracking. Summary of the invention

[0006] The object of the present invention is to provide a composite multi-layer plywood processing method capable of reducing cracking, so as to solve the above-mentioned problems.

[0007] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows: A composite multi-layer plywood capable of reducing cracking comprises a pair of outer panels and a pair of inner core panels, wherein the inner core panels are located between the pair of outer panels, a reserved groove is provided at one end of the inner core panel close to the outer panels, a plurality of arcuate grooves are provided at the inner end of the reserved groove, an anti-cracking component is fixedly connected to the inner end of the arcuate groove, and the plurality of anti-cracking components are distributed in a matrix, and a plurality of variable nails corresponding to the anti-cracking components are fixedly connected to one end of the outer panel close to the inner core panel.

[0008] As a further improvement of the present invention, the inner end of the reserved groove is fixedly connected to a tic-tac-toe frame, and a plurality of anti-cracking components are respectively located in the middle holes of the tic-tac-toe frame.

[0009] As a further improvement of the present invention, the anti-cracking component includes a wrapping bag, which is arranged in the arc surface groove. The wrapping bag is fixedly connected to a composite film at one end close to the outer panel, and the composite film is fixedly connected to the inner wall of the arc surface groove. The wrapping bag is filled with a mixed glue.

[0010] As a further improvement of the present invention, the composite membrane includes a breakable membrane, which is fixedly connected to one end of the wrapping bag close to the outer panel, and one end of the breakable membrane away from the wrapping bag is fixedly connected to a sealing membrane, and the sealing membrane is fixedly connected to the changeable nail.

[0011] As a further improvement of the present invention, the mixed glue solution is prepared by mixing phenolic glue and water in a ratio of 2-3:1.

[0012] As a further improvement of the present invention, the variable nail includes a support plate, which is embedded in the outer plate at one end close to the inner core plate, and the support plate is fixedly connected to a fusion rod at one end away from the outer plate, and the fusion rod is fixedly connected to a support head at one end away from the support plate, and the support head is fixedly connected to a puncture needle at one end away from the fusion rod, and the puncture needle passes through the support head.

[0013] As a further improvement of the present invention, the fusion rod is made of foam plastic, and a plurality of micro holes are formed at the outer end of the fusion rod.

[0014] As a further improvement of the present invention, the wrapping bag is made of fluororubber, and the wrapping bag is fitted with the arc surface groove.

[0015] A method for processing a composite multi-layer plywood capable of reducing cracking comprises the following steps: S1. Select wood with good quality and uniform moisture as the raw material board of plywood; S2, heat-treating the raw material plate to reduce its internal stress and moisture, and hot-pressing the raw material plate through a pressing mold to form an inner core plate with a reserved groove on the surface and a plurality of arc grooves in the reserved groove; S3, after the anti-crack assembly is fixedly installed on the inner end of the arc groove, the tic-tac-toe frame is fixedly installed in the reserved groove, and the multiple holes in the middle of the tic-tac-toe frame correspond to the multiple arc grooves respectively; S4, then embedding a plurality of variable nails on the surface of the outer panel according to the corresponding position array of the plurality of anti-cracking components; S5, laying adhesive on the side of the outer panel inlaid with the changeable nails according to the shape of the tic-tac-toe frame and covering it close to the inner core board, and then turning it over and performing the same operation so that a pair of outer panels sandwich a pair of inner core boards in the middle to obtain a composite multi-layer glued embryo board; S6. The composite multi-layer plywood is sent into a hot press for hot pressing. After forming, the composite multi-layer plywood is taken out and the excess adhesive at the edge is cleaned and trimmed to obtain a crack-resistant composite multi-layer plywood.

[0016] A method for processing a composite multi-layer plywood capable of reducing cracking, wherein the specific processing of the variable nails in step S4 comprises the following steps: S401, embedding a plurality of support sheets corresponding to a plurality of anti-cracking components on the surface of the outer panel by using an air gun device; S402, then fixing a fusion rod with a plurality of micropores on its outer end surface to the other side of the support sheet; S403, the support head with the puncture needle is fixedly installed on the end of the fusion rod away from the support plate, and when the outer plate and the inner core plate are pressed together, the puncture needle is inserted into the sealing film and pressed against the surface of the easily breakable film, and the sealing film softens and sticks under the action of high temperature to fix the easily breakable nail.

[0017] Compared with the prior art, the advantages of the present invention are: This scheme arranges anti-cracking components in a matrix and combines them with variable nails to prevent plywood from cracking. When the composite multi-layer plywood expands due to heat, the local outer surface panel bulges and drives the variable nails to move and pull open the composite film, allowing the mixed glue to flow out and combine with the variable nails to adhere and fill the space between the outer surface panel and the inner core panel, thereby preventing the bulge from being squeezed and cracked. When it shrinks at low temperature, the outer surface panel is concave, causing the variable nails to move and pierce the composite film, similarly causing the mixed glue to flow out and fill the space between the outer surface panel and the inner core panel, preventing the outer surface panel from being cracked due to stress. When the outer surface panel cracks, the mixed glue can flow to the crack to adhere and repair the crack, thereby effectively reducing the cracking of the composite multi-layer plywood. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the composite multi-layer plywood of the present invention; Figure 2 An exploded view of the composite multi-layer plywood of the present invention; Figure 3 It is a schematic diagram of the side cross-sectional structure of the composite multi-layer plywood of the present invention; Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle; Figure 5 It is a schematic diagram of the structure of the variable nail of the present invention; Figure 6 It is a schematic diagram of the front cross-sectional structure of the variable nail of the present invention.

[0019] Description of the numbers in the figure: 1. Outer panel; 2. Inner core panel; 3. T-shaped frame; 4. Anti-cracking component; 41. Wrapping capsule; 42. Composite film; 421. Breakable film; 422. Sealing film; 43. Mixed glue; 5. Variable nail; 51. Support sheet; 52. Fusion rod; 53. Support head; 54. Puncture needle. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0021] Embodiment 1:

[0022] See also Figure 1-6 A composite multi-layer plywood capable of reducing cracking comprises a pair of outer panels 1 and a pair of inner core panels 2, the pair of inner core panels 2 being located between the pair of outer panels 1, a reserved groove being provided at one end of the inner core panel 2 close to the outer panel 1, a plurality of arc grooves being provided at the inner end of the reserved groove, an anti-cracking component 4 being fixedly connected at the inner end of the arc groove, and the plurality of anti-cracking components 4 being distributed in a matrix, a plurality of variable nails 5 corresponding to the anti-cracking components 4 being fixedly connected at one end of the outer panel 1 close to the inner core panel 2, the outer panel 1 being deformed and moved by thermal expansion, contraction, extrusion and other influences so that the variable nails 5 are driven to pull and pierce the anti-cracking component 4, so that the glue in the anti-cracking component 4 overflows to adhere and fill the space between the outer panel 1 and the inner core panel 2, thereby reducing cracking.

[0023] A tic-tac-toe frame 3 is fixedly connected to the inner end of the reserved groove, and multiple anti-cracking components 4 are respectively located in the middle holes of the tic-tac-toe frame 3. The tic-tac-toe frame 3 can disperse and support the force exerted on the outer panel 1, and multiple anti-cracking components 4 can prevent local plywood respectively.

[0024] The anti-cracking component 4 includes a wrapping bag 41, which is arranged in the curved groove. A composite film 42 is fixedly connected to one end of the wrapping bag 41 close to the outer panel 1, and the composite film 42 is fixedly connected to the inner wall of the curved groove. The wrapping bag 41 is filled with a mixed glue 43. The composite film 42 is torn off or pierced by the variable nail 5, so that the mixed glue 43 is squeezed out of the curved groove under the elastic force of the wrapping bag 41 and filled into the middle hole of the tic-tac-toe frame 3 to stick the outer panel 1 to the inner core panel 2.

[0025] The wrapping bag 41 is made of fluororubber, and the wrapping bag 41 is fitted with the arc groove. Fluororubber has excellent heat resistance, acid and alkali resistance and weather resistance, and can maintain elasticity in a wide temperature range, so that it can not only adapt to different temperatures, but also use its elasticity to extrude the mixed glue 43; the wrapping bag 41 can also be made of any one of silicone rubber, chloroprene rubber, and propylene rubber, all of which have the functions of adaptability, stability and high elasticity.

[0026] The composite membrane 42 includes a breakable membrane 421, which is fixedly connected to one end of the wrapping bag 41 close to the outer panel 1, and a sealing membrane 422 is fixedly connected to one end of the breakable membrane 421 away from the wrapping bag 41, and the sealing membrane 422 is fixedly connected to the variable nail 5. The mixed glue 43 can be sealed in the concave bag formed by the wrapping bag 41 through the sealing membrane 422, and the breakable membrane 421 can be more easily pierced by the variable nail 5.

[0027] The sealing film 422 is preferably a polyolefin hot-melt adhesive film with a hot-melt temperature of 50°C or above. The polyolefin hot-melt adhesive film is a hot-melt adhesive material made of polyolefin as the main raw material. It has good high-temperature resistance and adhesion properties. It can provide a reliable bonding effect. Under the high-temperature hot pressure of the gluing machine, it not only shapes the composite multi-layer plywood, but also fixes the variable nail 5 and the sealing film 422 together.

[0028] The sealing film 422 can also be made of any one of hot-melt polyester film, hot-melt polyamide film and hot-melt polypropylene film.

[0029] The breakable membrane 421 is preferably a polytetrafluoroethylene film, which has excellent high temperature resistance and chemical stability, and can maintain its stable performance at extreme temperatures; at the same time, the PTFE film has high puncture strength and wear resistance, and is suitable for some occasions that need to withstand puncture at high temperatures.

[0030] The breakable film 421 may also be made of any one of polyetherketone film, polyimide film and ceramic film.

[0031] The mixed glue liquid 43 is made by mixing phenolic glue and water in a ratio of 2:1. Phenolic glue is a synthetic resin glue with good water resistance and heat resistance. It is usually used to produce plywood with high waterproof performance requirements. It has strong adhesion and durability and can effectively reduce the risk of cracking of plywood. The mixed glue liquid 43 can also be made of any one of urea-formaldehyde glue, phenolic-urea-formaldehyde mixed glue, hot melt glue, and environmentally friendly glue, all of which can reduce the cracking of composite multi-layer plywood.

[0032] The variable nail 5 includes a support sheet 51, which is embedded in the end of the outer panel 1 close to the inner core panel 2. The end of the support sheet 51 away from the outer panel 1 is fixedly connected to a fusion rod 52, the end of the fusion rod 52 away from the support sheet 51 is fixedly connected to a support head 53, the end of the support head 53 away from the fusion rod 52 is fixedly connected to a puncture needle 54, and the puncture needle 54 penetrates the support head 53. The support sheet 51 can be better embedded in the end face of the outer panel 1 as a whole, and the fusion rod 52 can absorb water to expand. The puncture needle 54 can be used to pierce the composite membrane 42 to allow the mixed glue 43 to penetrate into the fusion rod 52.

[0033] The fusion rod 52 is made of foam plastic, and a plurality of micropores are formed at the outer end of the fusion rod 52. The plurality of micropores can better absorb the water that penetrates into the outer panel 1. The foam plastic has a porous structure and can absorb water and expand to form a solid layer.

[0034] The anti-crack components 4 and the variable nails 5 can be manufactured in limited quantities according to demand. Although the cost will be higher if the quantity is larger, it can provide good protection and remediation for small cracks or cracks. Although the cost will be lower if the quantity is smaller, the effect of reducing cracks will be reduced.

[0035] Common foam plastics include polyethylene foam and polystyrene foam, which expand and swell when in contact with water to fill the hole in the middle of the tic-tac-toe frame 3. At the same time, the fusion rod 52 can absorb all the water in the mixed glue 43, which can make the glue solidify quickly, thereby improving the efficiency of the composite multi-layer plywood molding.

[0036] A method for processing a composite multi-layer plywood capable of reducing cracking comprises the following steps: S1. Select wood with good quality and uniform moisture as the raw material board of plywood; S2, heat-treating the raw material plate to reduce its internal stress and moisture, and hot-pressing the raw material plate through a pressing mold to form an inner core plate 2 with a reserved groove on the surface and a plurality of arc grooves in the reserved groove; S3, after the anti-crack component 4 is fixedly installed on the inner end of the arc groove, the tic-tac-toe frame 3 is fixedly installed in the reserved groove, and the multiple holes in the middle of the tic-tac-toe frame 3 correspond to the multiple arc grooves respectively; S4, then embedding a plurality of variable nails 5 on the surface of the outer panel 1 according to the corresponding position array of the plurality of anti-crack components 4; S5, laying adhesive on the side of the outer panel 1 inlaid with the variable nails 5 according to the shape of the tic-tac-toe frame 3 and covering it close to the inner core board 2, and performing the same operation after turning it over so that a pair of outer panels 1 sandwich a pair of inner core boards 2 in the middle to obtain a composite multi-layer glued embryo board; S6. The composite multi-layer plywood is sent into a hot press for hot pressing. After forming, the composite multi-layer plywood is taken out and the excess adhesive at the edge is cleaned and trimmed to obtain a crack-resistant composite multi-layer plywood.

[0037] A method for processing a composite multi-layer plywood capable of reducing cracking, wherein the specific processing of the variable nail 5 in step S4 comprises the following steps: S401, using an air gun device to embed multiple support sheets 51 corresponding to multiple anti-crack components 4 on the surface of the outer panel 1; S402, then fix the fusion rod 52 with multiple micropores on the outer end surface to the other side of the support sheet 51; S403, the support head 53 with the puncture needle 54 is fixedly installed on the end of the fusion rod 52 away from the support plate 51, and when the outer plate 1 and the inner core plate 2 are pressed together, the puncture needle 54 is inserted into the sealing film 422 and pressed against the surface of the breakable film 421, and the sealing film 422 softens and sticks under the action of high temperature to fix the breakable nail 5.

[0038] Working principle: When the outer panel 1 is heated, blistered in water, or subjected to other phenomena such as impact and extrusion, the outer panel 1 may expand and produce bulges, so that the outer panel 1 drives the variable nail 5 to tear off the composite film 42, so that the mixed glue 43 flows out and contacts the fusion rod 52. At this time, the fusion rod 52 absorbs all its moisture and expands to form a solid layer, which not only fills the holes in the tic-tac-toe frame 3, but also adheres the outer panel 1 to the inner core board 2, thereby reducing cracking; and when the outer panel 1 is cooled or locally compressed, etc., the outer panel 1 may be dented, and the outer panel 1 drives the variable nail 5 to pierce the breakable film 421, so that the fusion rod 52 is also combined with the mixed glue 43, thereby reducing the cracking of the composite multi-layer plywood.

[0039] It can be seen from the above technical solutions that the present invention has the following beneficial effects: The present solution prevents the plywood from cracking by arranging the anti-cracking components 4 in a matrix and combining them with the variable nails 5. When the composite multi-layer plywood is heated or squeezed and expanded, the local outer surface panel 1 bulges and drives the variable nails 5 to move and pull open the composite film 42 to allow the mixed glue 43 to flow out. Under the action of the variable nails 5, the outer surface panel 1 and the inner core panel 2 are adhered and filled to prevent the bulging area from being squeezed and cracked. When it shrinks at low temperature or is squeezed locally, the outer surface panel 1 is concave to cause the variable nails 5 to move and pierce the composite film 42, so that the mixed glue 43 flows out and fills between the outer surface panel 1 and the inner core panel 2 to prevent the outer surface panel 1 from being cracked. When the outer surface panel 1 cracks, the mixed glue 43 can flow to the crack to adhere and repair the crack, thereby effectively reducing the cracking of the composite multi-layer plywood.

[0040] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0041] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A composite multi-layer plywood capable of reducing cracking, Features: The invention comprises a pair of outer panels (1) and a pair of inner core panels (2), wherein the pair of inner core panels (2) are located between the pair of outer panels (1), a reserved groove is provided at one end of the inner core panel (2) close to the outer panel (1), a plurality of arcuate grooves are provided at the inner end of the reserved groove, an anti-crack component (4) is fixedly connected to the inner end of the arcuate groove, and the plurality of anti-crack components (4) are distributed in a matrix, and a plurality of changeable nails (5) corresponding to the anti-crack components (4) are fixedly connected to one end of the outer panel (1) close to the inner core panel (2).

2. A composite multi-layer plywood capable of reducing cracking according to claim 1, Features: The inner end of the reserved groove is fixedly connected to a tic-tac-toe frame (3), and a plurality of anti-cracking components (4) are respectively located in the middle holes of the tic-tac-toe frame (3).

3. A composite multi-layer plywood capable of reducing cracking according to claim 1, Features: The anti-cracking component (4) comprises a wrapping bag (41), the wrapping bag (41) being arranged in the arc surface groove, the wrapping bag (41) having one end close to the outer panel (1) fixedly connected to a composite film (42), and the composite film (42) being fixedly connected to the inner wall of the arc surface groove, and the wrapping bag (41) being filled with a mixed glue liquid (43).

4. A composite multi-layer plywood capable of reducing cracking according to claim 3, Features: The composite membrane (42) comprises a breakable membrane (421), wherein the breakable membrane (421) is fixedly connected to an end of the wrapping bag (41) close to the outer panel (1), and an end of the breakable membrane (421) away from the wrapping bag (41) is fixedly connected to a sealing membrane (422), and the sealing membrane (422) is fixedly connected to the changeable nail (5).

5. A composite multi-layer plywood capable of reducing cracking according to claim 3, Features: The mixed glue solution (43) is prepared by mixing phenolic glue and water in a ratio of 2-3:

1.

6. A composite multi-layer plywood capable of reducing cracking according to claim 2, Features: The changeable nail (5) comprises a support sheet (51), wherein the support sheet (51) is embedded in one end of the outer plate (1) close to the inner core plate (2), the end of the support sheet (51) away from the outer plate (1) is fixedly connected to a fusion rod (52), the end of the fusion rod (52) away from the support sheet (51) is fixedly connected to a support head (53), the end of the support head (53) away from the fusion rod (52) is fixedly connected to a puncture needle (54), and the puncture needle (54) penetrates the support head (53).

7. A composite multi-layer plywood capable of reducing cracking according to claim 6, Features: The fusion rod (52) is made of foam plastic, and a plurality of micro holes are formed at the outer end of the fusion rod (52).

8. A composite multi-layer plywood capable of reducing cracking according to claim 3, Features: The wrapping bag (41) is made of fluororubber, and the wrapping bag (41) fits the arc surface groove.

9. A method for processing a composite multi-layer plywood capable of reducing cracking according to claim 6, Features: The following steps are involved: S1. Select wood with good quality and uniform moisture as the raw material board of plywood; S2, heat-treating the raw material plate to reduce its internal stress and moisture, and hot-pressing the raw material plate through a pressing mold to form an inner core plate (2) having a reserved groove on the surface and a plurality of arc grooves in the reserved groove; S3, after the anti-crack component (4) is fixedly installed on the inner end of the arc surface groove, the tic-tac-toe frame (3) is fixedly installed in the reserved groove, and the multiple holes in the middle of the tic-tac-toe frame (3) correspond to the multiple arc surface grooves respectively; S4, then embedding a plurality of variable nails (5) on the surface of the outer panel (1) according to the array of corresponding positions of the plurality of anti-cracking components (4); S5, laying adhesive on the side of the outer panel (1) inlaid with the changeable nails (5) according to the shape of the tic-tac-toe frame (3) and covering it close to the inner core panel (2), and turning it over and performing the same operation so that a pair of outer panels (1) sandwich a pair of inner core panels (2) in the middle, thereby obtaining a composite multi-layer glued embryo board; S6. The composite multi-layer plywood is sent into a hot press for hot pressing. After forming, the composite multi-layer plywood is taken out and the excess adhesive at the edge is cleaned and trimmed to obtain a crack-resistant composite multi-layer plywood.

10. A method for processing a composite multi-layer plywood capable of reducing cracking according to claim 9, Features: The specific processing of the changeable nail (5) in step S4 includes the following steps: S401, using an air gun device to embed a plurality of support sheets (51) corresponding to a plurality of anti-cracking components (4) on the surface of the outer panel (1); S402, then fixing a fusion rod (52) having a plurality of micropores formed on its outer end surface to the other side of the support sheet (51); S403, the support head (53) with the puncture needle (54) fixed thereon is fixedly mounted on the end of the fusion rod (52) away from the support sheet (51), and when the outer plate (1) and the inner core plate (2) are pressed together, the puncture needle (54) is inserted into the sealing film (422) and pressed against the surface of the breakable film (421), and the sealing film (422) softens and adheres under the action of high temperature to fix the breakable nail (5).

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