A processing method of composite multi-layer plywood capable of reducing cracking

Abstract

The application discloses a processing method of a composite multi-layer plywood capable of reducing cracking, which comprises a pair of outer surface plates and a pair of inner core plates, and the pair of inner core plates are located between the pair of outer surface plates. The application is used for preventing cracking of the plywood by arranging the anti-cracking components in a matrix mode and combining the variable nails. When the composite multi-layer plywood is expanded by heat, the local outer surface plate is bulged to move the variable nail, pull apart the composite film, make the mixed glue flow out, combine with the variable nail, stick between the outer surface plate and the inner core plate, and fill, so as to prevent the bulging part from being pressed and cracked. When the outer surface plate is shrunk by low temperature, the outer surface plate is concave to move the variable nail to pierce the composite film, so that the mixed glue flows out and fills between the outer surface plate and the inner core plate, the outer surface plate is prevented from being cracked by force, and when the outer surface plate is cracked, the mixed glue can flow to the crack to stick and repair the cracking part, so that the cracking of the composite multi-layer plywood is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plywood manufacturing, and more particularly, to a processing method of composite multi-layer plywood capable of reducing cracking. BACKGROUND

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

[0003] Composite multi-layer plywood is a complex structure of wood-based panel, which is formed by cross-stacking of multiple layers of thin wood sheets, and the grain direction of each layer of wood sheet is usually perpendicular to each other. This cross-stacking structure gives the plywood high strength and stability, making it widely used in construction, furniture manufacturing, shipbuilding, packaging and other fields.

[0004] However, the existing composite multi-layer plywood may expand and form a bulge in some local parts when heated or subjected to a collision and extrusion, and is extremely easy to crack under the action of external force. When it is damp, it may also crack like extrusion. In a low temperature environment, due to the low temperature, the board surface may be cold shrunk, and local board surface may be concave, or the board surface may be subjected to local pressure, and other conditions, which may also cause cracking.

[0005] Therefore, in view of the above technical problems, it is necessary to provide a processing method of composite multi-layer plywood capable of reducing cracking. SUMMARY

[0006] The purpose of the present application is to provide a processing method of composite multi-layer plywood capable of reducing cracking to solve the above problems.

[0007] In order to achieve the above purpose, the technical scheme provided by an embodiment of the present application is as follows:

[0008] A composite multi-layer plywood capable of reducing cracking, comprising a pair of outer plates and a pair of inner core plates, a pair of inner core plates is located between a pair of outer plates, a reserved slot is formed at one end of the inner core plate close to the outer plate, a plurality of arc surface grooves are formed at the inner end of the reserved slot, a crack prevention assembly is fixedly connected at the inner end of the arc surface groove, and a plurality of crack prevention assemblies are distributed in a matrix, a plurality of easy-to-change nails corresponding to the crack prevention assembly are fixedly connected at one end of the outer plate close to the inner core plate.

[0009] As a further improvement of the present application, the inner end of the reserved slot is fixedly connected with a cross frame, and a plurality of crack prevention assemblies are respectively located in the middle hole of the cross frame.

[0010] As a further improvement of the present application, the anti-cracking assembly comprises a wrapping capsule, the wrapping capsule is arranged in the arc groove, the wrapping capsule is fixedly connected with the composite film near one end of the outer surface plate, and the composite film is fixedly connected with the inner wall of the arc groove, and the wrapping capsule is filled with mixed glue solution.

[0011] As a further improvement of the present application, the composite film comprises a breakable film, the breakable film is fixedly connected with the wrapping capsule near one end of the outer surface plate, and the breakable film is fixedly connected with the sealing film away from one end of the wrapping capsule, and the sealing film is fixedly connected with the variable nail.

[0012] As a further improvement of the present application, the mixed glue solution is prepared by mixing phenolic glue and water, and the ratio is 2-3:1.

[0013] As a further improvement of the present application, the variable nail comprises a support sheet, the support sheet is inlaid in the outer surface plate near one end of the inner core plate, the support sheet is fixedly connected with the fusion rod away from one end of the outer surface plate, the fusion rod is fixedly connected with the support head away from one end of the support sheet, the support head is fixedly connected with the puncture needle away from one end of the fusion rod, and the puncture needle penetrates through the support head.

[0014] As a further improvement of the present application, the fusion rod is made of foamed plastic, and a plurality of micropores are formed in the outer end of the fusion rod.

[0015] As a further improvement of the present application, the wrapping capsule is made of fluorine rubber, and the wrapping capsule is attached to the arc groove.

[0016] A processing method of a composite multi-layer plywood capable of reducing cracking, comprising the following steps:

[0017] S1, selecting wood with good quality and uniform humidity as raw material plate of the plywood;

[0018] S2, heat treating the raw material plate to reduce 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;

[0019] S3, after fixing and installing the anti-cracking assembly in the inner end of the arc groove, fixing and installing the cross frame in the reserved groove, and making the plurality of holes in the middle of the cross frame correspond to the plurality of arc grooves respectively;

[0020] S4, then inlaying the plurality of variable nails on the surface of the outer surface plate according to the corresponding positions of the plurality of anti-cracking assemblies;

[0021] S5, laying the adhesive on the surface of the outer surface plate inlaid with the variable nails according to the shape of the cross frame and covering it close to the inner core plate, and after turning over, performing the same operation to make a pair of outer surface plates sandwich a pair of inner core plates to obtain a composite multi-layer plywood blank;

[0022] S6, the composite multi-layer plywood is sent into a hot press for hot pressing, and after molding, the excess adhesive at the edge is cleaned and trimmed, so that the anti-cracking composite multi-layer plywood is obtained.

[0023] A processing method of a composite multi-layer plywood capable of reducing cracking, and the specific processing of the changeable nail in step S4 includes the following steps.

[0024] S401, a plurality of support pieces are inlaid on the surface of the outer plate by a gas gun device corresponding to a plurality of anti-cracking components;

[0025] S402, then a fusion rod with a plurality of micro-holes opened on the outer end surface is fixedly connected to the other side of the support piece;

[0026] S403, the support head fixedly installed with the puncture needle is fixedly installed at the end of the fusion rod away from the support piece, and when the outer plate and the inner core plate are pressed together, the puncture needle penetrates into the sealing film and abuts against the surface of the changeable nail, and the sealing film is softened and adhered to fix the changeable nail under the action of high temperature.

[0027] Compared with the prior art, the advantages of the present application are:

[0028] The present application prevents the cracking of the plywood by arranging the anti-cracking components in a matrix and combining the changeable nails. When the composite multi-layer plywood is heated and expanded, the local outer plate bulges and moves the changeable nails to pull open the composite film, so that the mixed glue flows out and is combined with the changeable nails to adhere and fill between the outer plate and the inner core plate, thereby preventing the bulging part from being cracked under stress. When the outer plate is cooled and shrinks, the outer plate is concave, the changeable nails move to pierce the composite film, and the mixed glue also flows out and fills between the outer plate and the inner core plate, thereby preventing the outer plate from being cracked under stress. In addition, when the outer plate is cracked, 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 DRAWINGS

[0029] Figure 1 The figure is a structure diagram of the composite multi-layer plywood of the present application;

[0030] Figure 2 The figure is an exploded view of the composite multi-layer plywood of the present application;

[0031] Figure 3 The figure is a structure diagram of the side view of the composite multi-layer plywood of the present application;

[0032] Figure 4 The figure is a structure diagram of the changeable nail of the present application; Figure 3 The figure is an enlarged structure diagram of position A in the present application;

[0033] Figure 5 The figure is a structure diagram of the changeable nail of the present application;

[0034] Figure 6Figure 1 is a schematic view of the front view structure of the variable nail of the present application.

[0035] Figure 1 is a schematic view of the front view structure of the variable nail of the present application.

[0036] 1, outer plate; 2, inner core plate; 3, frame; 4, anti-cracking assembly; 41, wrapped capsule; 42, composite film; 421, breakable film; 422, sealing film; 43, mixed glue; 5, variable nail; 51, support piece; 52, fusion rod; 53, support head; 54, puncture needle. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0038] Embodiment 1

[0039] Please refer to Figures 1-6 A composite multi-layer plywood capable of reducing cracking includes a pair of outer plates 1 and a pair of inner core plates 2. The pair of inner core plates 2 is located between the pair of outer plates 1. The inner core plate 2 is provided with a reserved slot near one end of the outer plate 1. A plurality of arc grooves are formed in the inner end of the reserved slot. An anti-cracking assembly 4 is fixedly connected to the inner end of the arc groove. The plurality of anti-cracking assemblies 4 are arranged in a matrix. A plurality of variable nails 5 corresponding to the anti-cracking assemblies 4 are fixedly connected to the outer plate 1 near one end of the inner core plate 2. The variable nails 5 are moved by the deformation of the outer plate 1 caused by thermal expansion, cold shrinkage, extrusion and other influences, so as to pull and pierce the anti-cracking assemblies 4, so that the glue in the anti-cracking assemblies 4 overflows to adhere and fill between the outer plate 1 and the inner core plate 2, thereby reducing cracking.

[0040] The reserved slot is fixedly connected with a frame 3, and the plurality of anti-cracking assemblies 4 are respectively located in the middle hole of the frame 3. The frame 3 can disperse and support the force received by the outer plate 1, and the plurality of anti-cracking assemblies 4 can prevent the local plywood respectively.

[0041] The anti-cracking assembly 4 includes a wrapped capsule 41, which is arranged in the arc groove. The wrapped capsule 41 is fixedly connected with a composite film 42 near one end of the outer plate 1, and the composite film 42 is fixedly connected with the inner wall of the arc groove. The wrapped capsule 41 is filled with mixed glue 43. The composite film 42 is pulled down or pierced by the variable nail 5, so that the mixed glue 43 is squeezed out of the arc groove under the elastic force of the wrapped capsule 41 and filled into the middle hole of the frame 3 to adhere the outer plate 1 and the inner core plate 2.

[0042] The wrapping capsule 41 is made of fluororubber, and the wrapping capsule 41 is attached to the arc-shaped groove. The fluororubber has excellent heat resistance, acid and alkali resistance and weather resistance, and can maintain elasticity in a wide temperature range, so as to not only adapt to different temperatures, but also extrude the mixed glue 43 by using the elasticity; the wrapping capsule 41 can also be made of any one of silicone rubber, chloroprene rubber and propylene rubber, which all have the effects of adaptability, stability and high elasticity.

[0043] The composite film 42 includes a breakable film 421 fixedly connected to the wrapping capsule 41 near one end of the outer surface plate 1, and a sealing film 422 fixedly connected to the breakable film 421 away from the wrapping capsule 41, and the sealing film 422 is fixedly connected to the variable nail 5. The mixed glue 43 can be sealed in the concave capsule formed by the wrapping capsule 41 by the sealing film 422, and the breakable film 421 can be more easily pierced by the variable nail 5.

[0044] The sealing film 422 is preferably a polyolefin hot melt adhesive film, and the hot melt temperature is above 50°C. The polyolefin hot melt adhesive film is a hot melt adhesive material made of polyolefin as the main raw material, which has good high temperature resistance and adhesion. It can provide reliable bonding effect. Under the high temperature hot pressing of the gluing machine, not only the composite multi-layer plywood is formed, but also the variable nail 5 and the sealing film 422 are fixedly connected.

[0045] The sealing film 422 can also be any one of a hot melt type polyester film, a hot melt type polyamide film and a hot melt type polypropylene film.

[0046] The breakable film 421 is preferably a polytetrafluoroethylene film. The polytetrafluoroethylene film has excellent high temperature resistance and chemical stability, and can maintain its performance stability 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 temperature.

[0047] The breakable film 421 can also be any one of a polyether ketone film, a polyimide film and a ceramic film.

[0048] The mixed glue 43 is made of phenolic glue mixed with water, and the ratio is 2:1. Phenolic glue is a synthetic resin glue with good water resistance and heat resistance, which is usually used to produce plywood with high waterproof performance. It has strong adhesion and durability, which can effectively reduce the risk of cracking of the plywood. The mixed glue 43 can also be any one of urea-formaldehyde glue, phenolic-urea-formaldehyde mixed glue, hot melt glue and environmentally friendly glue, which can all reduce the cracking of the composite multi-layer plywood.

[0049] The changeable nail 5 includes a supporting sheet 51 inlaid on one end of the outer surface plate 1 close to the inner core plate 2, a fusion rod 52 fixedly connected to one end of the supporting sheet 51 away from the outer surface plate 1, a supporting head 53 fixedly connected to one end of the fusion rod 52 away from the supporting sheet 51, and a puncture needle 54 fixedly connected to one end of the supporting head 53 away from the fusion rod 52, and the puncture needle 54 penetrates through the supporting head 53. The supporting sheet 51 can be better inlaid on the end surface of the outer surface plate 1 as a whole, the fusion rod 52 can absorb water to expand, and the puncture needle 54 can pierce the composite film 42 to make the mixed glue liquid 43 penetrate into the fusion rod 52.

[0050] The fusion rod 52 is made of foamed plastic, and a plurality of micropores are formed on the outer end of the fusion rod 52. The plurality of micropores can better absorb the water penetrating into the outer surface plate 1. The foamed plastic has a porous structure and can absorb water and expand to form a solid layer.

[0051] The anti-cracking assembly 4 and the changeable nail 5 can be made according to the required number limitation. The more the number is, the higher the cost is, but it can better protect and remedy the small part cracking or the cracking part. The less the number is, the lower the cost is, but the effect of reducing cracking is reduced.

[0052] Common foamed plastics include polyethylene foam and polystyrene foam. The foamed plastics can be used to fill the holes in the middle of the frame 3 by swelling and expanding when water is encountered. At the same time, the fusion rod 52 can completely absorb the water in the mixed glue liquid 43, so that the glue can quickly solidify, thereby improving the efficiency of forming the composite multi-layer plywood.

[0053] A processing method of a composite multi-layer plywood capable of reducing cracking, comprising the following steps:

[0054] S1, selecting wood with good quality and uniform humidity as a raw material plate of the plywood;

[0055] S2, heat treating the raw material plate to reduce internal stress and moisture, and hot-pressing the raw material plate by a pressing mold to form the inner core plate 2 with a reserved groove on the surface and a plurality of arc grooves in the reserved groove;

[0056] S3, fixing and installing the anti-cracking assembly 4 in the arc groove, then fixing and installing the frame 3 in the reserved groove, and making the plurality of holes in the middle of the frame 3 correspond to the plurality of arc grooves, respectively;

[0057] S4, then arraying and inlaying the plurality of changeable nails 5 on the surface of the outer surface plate 1 according to the corresponding positions of the plurality of anti-cracking assemblies 4;

[0058] S5, on the side of the outer surface plate 1 inlaid with the changeable nail 5, the glue is laid according to the shape of the frame 3 and covered close to the inner core plate 2, after turning over, the same operation is carried out, so that a pair of outer surface plates 1 sandwich a pair of inner core plates 2, and a composite multi-layer plywood blank is obtained;

[0059] S6, the composite multi-layer plywood blank is sent into a hot press for hot pressing, and after forming, the excess glue at the edge is cleaned and trimmed, and a composite multi-layer plywood with crack resistance is obtained.

[0060] A processing method of a composite multi-layer plywood capable of reducing cracking, and the specific processing of the changeable nail 5 in step S4 comprises the following steps:

[0061] S401, a plurality of support pieces 51 corresponding to a plurality of anti-cracking assemblies 4 are inlaid on the surface of the outer surface plate 1 through a gas gun device;

[0062] S402, a fusion rod 52 with a plurality of micro-holes opened on the outer end surface is fixedly connected to the other side of the support piece 51;

[0063] S403, a support head 53 fixedly installed with a puncture needle 54 is fixedly installed at the end of the fusion rod 52 away from the support piece 51, and when the outer surface plate 1 is pressed with the inner core plate 2, the puncture needle 54 is inserted into the sealing film 422 and abuts against the surface of the breakable film 421, and the sealing film 422 is softened and adhered to fix the changeable nail 5 under the action of high temperature.

[0064] Working principle:

[0065] When the outer surface plate 1 is heated, soaked in water, or subjected to other phenomena such as impact extrusion force, the outer surface plate 1 may swell and form a bulge, so that the outer surface plate 1 drives the changeable nail 5 to tear down 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 the water and expands to form a solid layer, which not only fills in the holes of the frame 3, but also adheres the outer surface plate 1 to the inner core plate 2, thereby reducing cracking; when the outer surface plate 1 is cooled or locally pressed, the outer surface plate 1 may be concave, and the outer surface plate 1 drives the changeable nail 5 to pierce the breakable film 421, so that the fusion rod 52 is combined with the mixed glue 43, thereby reducing the cracking of the composite multi-layer plywood.

[0066] From the above technical solution, the present application has the following beneficial effects:

[0067] The scheme prevents the plywood from cracking by arranging the anti-cracking assembly 4 in a matrix and combining the variable nails 5, when the composite plywood is heated or pressed, the outer plate 1 is bulged and drives the variable nails 5 to move and pull the composite film 42 to make the mixed glue 43 flow out, under the action of the variable nails 5, the mixed glue 43 is filled between the outer plate 1 and the core plate 2, so as to prevent the bulging part from cracking under stress, when the temperature is low or the local stress is pressed, the outer plate 1 is concave, the variable nails 5 are moved to pierce the composite film 42, and the mixed glue 43 flows out and fills between the outer plate 1 and the core plate 2, so as to prevent the outer plate 1 from cracking under stress, and when the outer plate 1 cracks, the mixed glue 43 can flow to the crack to stick and repair the crack, thereby effectively reducing the cracking of the composite plywood.

[0068] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to embrace all changes falling within the meaning and range of equivalents of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

[0069] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A composite multi-layer plywood capable of reducing cracking, characterized in that: 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-cracking component (4) is fixedly connected to the inner end of the arcuate groove, and the plurality of anti-cracking components (4) are distributed in a matrix, and a plurality of changeable nails (5) corresponding to the anti-cracking components (4) are fixedly connected to one end of the outer panel (1) close to the inner core panel (2); 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); The anti-cracking component (4) includes a wrapping bag (41), the wrapping bag (41) is arranged in the arc surface groove, the wrapping bag (41) is fixedly connected to a composite film (42) at one end close to the outer plate (1), and the composite film (42) is fixedly connected to the inner wall of the arc surface groove, and the wrapping bag (41) is filled with a mixed glue (43); The composite membrane (42) includes a breakable membrane (421), the breakable membrane (421) is fixedly connected to one end of the wrapping bag (41) close to the outer plate (1), and the 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); The mixed glue solution (43) is prepared by mixing phenolic glue and water in a ratio of 2-3:1; The changeable nail (5) includes a support plate (51), the support plate (51) is embedded in one end of the outer plate (1) close to the inner core plate (2), the support plate (51) is fixedly connected to the fusion rod (52) at one end away from the outer plate (1), the fusion rod (52) is fixedly connected to the support head (53) at one end away from the support plate (51), the support head (53) is fixedly connected to the puncture needle (54) at one end away from the fusion rod (52), and the puncture needle (54) passes through the support head (53); The fusion rod (52) is made of foam plastic, and a plurality of micropores are formed on the outer end of the fusion rod (52); The wrapping bag (41) is made of fluororubber, and the wrapping bag (41) fits the arc surface groove.

2. The method for processing composite multi-layer plywood capable of reducing cracking according to claim 1, characterized in that: The following steps are involved: S1. Select wood of 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-shaped grooves in the reserved groove; S3, after fixing the anti-cracking component (4) to the inner end of the arc groove, the well frame (3) is fixedly installed in the reserved groove, and the multiple holes in the middle of the well 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-cracking components (4); S5, laying adhesive on the side of the outer surface panel (1) inlaid with the variable nail (5) according to the shape of the well frame (3) and covering it close to the inner core panel (2), turning it over and performing the same operation so that the pair of outer surface panels (1) sandwich the pair of inner core panels (2) in the middle, thereby obtaining a composite multi-layer plywood blank; S6. The composite multi-layer plywood is sent to 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.

3. The method for processing composite multi-layer plywood capable of reducing cracking according to claim 2, characterized in that: The specific processing of the flexible nail (5) in step S4 includes the following steps: S401, using an air gun device to embed multiple support sheets (51) corresponding to multiple anti-cracking components (4) on the surface of the outer panel (1); S402, then fixing the fusion rod (52) with a plurality of micropores 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 sticks under the action of high temperature to fix the breakable nail (5).

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