CN115026915A - First-laid type veneered large-piece shaving composite blockboard and manufacturing method thereof - Google Patents
First-laid type veneered large-piece shaving composite blockboard and manufacturing method thereof Download PDFInfo
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- CN115026915A CN115026915A CN202210515830.2A CN202210515830A CN115026915A CN 115026915 A CN115026915 A CN 115026915A CN 202210515830 A CN202210515830 A CN 202210515830A CN 115026915 A CN115026915 A CN 115026915A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/06—Manufacture of central layers; Form of central layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/10—Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0209—Methods, e.g. characterised by the composition of the agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/14—Distributing or orienting the particles or fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/14—Distributing or orienting the particles or fibres
- B27N3/143—Orienting the particles or fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
- B27N3/20—Moulding or pressing characterised by using platen-presses
- B27N3/203—Moulding or pressing characterised by using platen-presses with heating or cooling means
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention relates to the technical field of artificial boards, in particular to a first-paving type veneering large-piece shaving composite core-board and a manufacturing method thereof, which comprises the following steps: s1: preparing wood fine materials; s2: preparing large-piece wood shavings: preparing large-piece wood shavings, and mixing and stirring the large-piece wood shavings and the adhesive uniformly; s3: preparing a core layer: the core layer is formed by splicing wood laths; s4: paving: paving the fine wood materials, the large wood shavings, the core layer, the large wood shavings and the fine wood materials on a paving line from bottom to top in sequence to form a plate blank with a five-layer structure comprising a lower surface layer, a next lower surface layer, the core layer, a last surface layer and an upper surface layer from bottom to top, wherein the large wood shavings are directionally paved in a crisscross mode or are uniformly paved; s5: and (3) pressing and forming: and carrying out hot pressing on the plate blank. The preparation method has the advantages of simple production process, high efficiency and low cost, and the product has the advantages of low deformation, high surface flatness, high transverse static bending strength and capability of keeping the characteristics of the raw wood.
Description
Technical Field
The invention relates to the technical field of artificial boards, in particular to a first-paving type veneering large-piece shaving composite core-board and a manufacturing method thereof.
Background
The core board is a special plywood formed by gluing and pressing two or more layers of plywood covered on two surfaces of a core board made of wood laths spliced or hollow boards on the basis of plywood production to form an ecological board substrate, and the core board of the core board made of the wood laths spliced and glued on the side surfaces is used for home decoration boards, so that the form of raw wood is reserved, and the core board has the characteristics of nature and environmental protection; in order to achieve the purpose that the surface of the core-board can be directly faced, at present, the core-board capable of being directly faced can be prepared by uniformly mixing wood fibers or wood shavings with an adhesive, directly paving the mixture on the upper surface and the lower surface of a common core-board core board of the core-board, and then carrying out high-temperature hot pressing.
However, the core board of the core board is laterally pressed when being spliced, and the adhesive is coated on the side surface of the core board, so that when being hot-pressed, the core board has larger compression amount of the base material of the core board due to larger hot-pressing pressure and has no structure for supporting the stress of the side surface, thereby easily causing the deformation of the finished board, and the whole board has different thickness, lower transverse static bending strength and poor quality and can not meet the application requirements of the standard.
For example, chinese patent publication No. CN111002425A discloses a method for manufacturing an ecological board with wood shaving composite veneer, which comprises the following steps: 1) adhering wood shavings by using an adhesive, and applying and stirring the wood shavings into the shavings; 2) gluing the upper and lower surfaces of a core board or a plywood of a laminated wood board with the thickness of 5-21 mm, the length of 2450-2750 mm and the width of 1230-1310 mm by using an adhesive, paving uniformly stirred wood shavings on the surface of a veneer, and 3) after paving, performing high-temperature hot pressing; 4) after hot pressing, air blowing and cooling for more than 5min, and then collecting and stacking to obtain a plate blank; 5) naturally curing the plate blank for more than 7 days, and performing edge sawing, sanding and thickness setting; 6) sanding a plate blank with a fixed thickness, and pressing and sticking impregnated film paper on the upper plate surface and the lower plate surface; 7) and hot pressing to obtain the ecological plate finished product. Because the veneered wood shaving after glue mixing is directly paved on the upper surface and the lower surface of the core of the block board, the defect that the transverse strength of the core of the block board is not enough to be supported by the transverse stress is not enough, so that the products formed by hot pressing crack, board surface deformation and transverse static bending strength are not enough.
Chinese patent publication No. CN110962192A, which discloses a method for manufacturing wood fiber composite veneer ecological board, comprising the following steps: 1) selecting wood fibers, adopting an adhesive for adhesion, applying and stirring the wood fibers in the fibers; 2) gluing upper and lower board surfaces of a core board of a veneer board by using an adhesive, and uniformly paving wood fibers which are uniformly stirred on the upper and lower board surfaces of the core board of the veneer board; 3) after paving, performing high-temperature hot pressing; 4) after hot pressing, air blowing and cooling for more than 5min, and then collecting and stacking to obtain a plate blank; 5) naturally curing the plate blank for more than 7 days; 6) sanding the plate blank with fixed thickness, and pressing and sticking the impregnated film paper on the upper and lower plate surfaces; 7) and hot pressing to obtain the finished product of the composite facing ecological plate. Similarly, because the glued wood fibers are directly paved on the upper surface and the lower surface of the core of the block board, the transverse stress does not exist enough to support the defect of insufficient transverse strength of the core of the block board, and thus, the hot-press formed product is cracked, the board surface is deformed, and the transverse static bending strength is insufficient.
Chinese patent publication No. CN111231024A, which discloses a composite artificial board with corrosion resistance, mold resistance and high flame resistance, wherein the composite artificial board is composed of a decorative layer and a slab layer which are combined arbitrarily; the veneer layer is made of wood materials or non-wood materials, wherein the wood materials comprise wood shavings, wood fibers, cotton stalks and mushroom bran; the blank layer is plywood, a blockboard, an oriented strand board or a straw board, the wood material of the blank layer is directly paved on the blockboard, and the product is easy to deform and poor in quality during hot pressing.
Disclosure of Invention
The invention provides a first-paving type veneering large-piece shaving composite block board and a manufacturing method thereof, overcomes the defects of the prior art, and can effectively solve the problems of poor product quality, large deformation and low transverse static bending strength of the existing first-paving type veneering large-piece shaving composite block board.
One of the technical schemes of the invention is realized by the following measures: a method for manufacturing a first-paving type veneered large-piece shaving composite core-board comprises the following steps:
s1: preparing wood fine materials: preparing wood fine materials, and mixing and stirring the wood fine materials and the adhesive uniformly;
s2: preparing large-piece wood shavings: preparing large-piece wood shavings, and mixing and stirring the large-piece wood shavings and the adhesive uniformly;
s3: preparing a core layer: the core layer is formed by splicing wood laths;
s4: paving: paving the fine wood materials, the large wood shavings, the core layer, the large wood shavings and the fine wood materials on a paving line from bottom to top in sequence to form a plate blank with a five-layer structure comprising a lower surface layer, a next lower surface layer, the core layer, a last surface layer and an upper surface layer from bottom to top, wherein the large wood shavings are directionally paved in a crisscross mode or are uniformly paved;
s5: and (3) pressing and forming: and carrying out hot pressing on the plate blank.
The following is a further optimization or/and improvement of one of the above technical solutions:
the length of the large wood shavings can be 6cm to 10cm, the width of the large wood shavings is 1cm to 3cm, the thickness of the large wood shavings is 0.25mm to 0.45mm, and the paving thickness of the previous surface layer and the next surface layer is 4mm to 6 mm.
The large wood shavings can be directionally paved in a criss-cross mode, and the next surface layer and the last surface layer after hot pressing are all directional wood shavings plate structures.
The large flakes can be uniformly spread, the number of the transverse large flakes accounts for 40-55% of the total amount of the large flakes, and the number of the longitudinal large flakes accounts for 45-60% of the total amount of the large flakes.
In the step S1, the wood fines quality requirement is as follows: the size of the sieving net is as follows: 1.4mm or less and 0.11mm or more and 0.11mm or more, wherein the adhesive can be any one or a combination of polyurethane adhesive, MDI adhesive and trioxane adhesive, the glue application amount of the adhesive is 10-28% of the weight of the wood fines, a waterproof agent and a curing agent are added into the wood fines, the addition amount of the waterproof agent is 1-2.5% of the weight of the wood fines, the addition amount of the curing agent is 1-2% of the weight of the wood fines, and the water content of the wood fines is controlled to be 10-13%; in step S4, the paving amount of the wood fine materials on the upper surface layer and the lower surface layer is 0.8kg/m 2-4.5 kg/m2, and the paving thickness of the upper surface layer and the lower surface layer is 4 mm-6 mm.
In the step S2, the length of the large wood shavings may be 6cm to 10cm, the width of the large wood shavings may be 1cm to 3cm, the thickness of the large wood shavings is 0.4mm, the adhesive may be any one or a combination of polyurethane adhesive, MDI adhesive and trioxaden adhesive, the amount of the applied adhesive is 10% to 28% of the weight of the large wood shavings, a waterproofing agent and a curing agent are added to the large wood shavings, the amount of the added waterproofing agent is 1% to 2.5% of the weight of the large wood shavings, the amount of the added curing agent is 1% to 2% of the weight of the large wood shavings, and the water content of the large wood shavings is controlled to 5% to 8%; in the step S4, the paving amount of the big chips on the previous surface layer and the next surface layer is 1.2kg/m 2-5.5 kg/m 2.
In the step S3, the core layer may be a core board or a core board; the length of the core layer is 2450mm to 2750mm, the width of the core layer is 1250mm to 1350mm, the thickness of the core layer is 12mm to 20mm, glue is applied to the upper surface and the lower surface of the core layer, and the single-side glue application amount is 100g/m2 to 150g/m 2.
The specific process of hot pressing the slab in the step S5 may be: prepressing the plate blank firstly, and then carrying out high-temperature hot pressing on the prepressed plate blank, wherein the hot pressing temperature is 140-180 ℃, and the actual unit pressure and the hot pressing time are divided into five sections, one section: 0MPa to 1.0MPa, 20 s; and (2) second stage: 1.0MPa to 0.8MPa for 20 s; and (3) three stages: 0.8MPa to 0.5MPa for 30 s; four stages are as follows: 0.5MPa for 60 s; five stages: 0.5MPa to 0.0MPa for 60 s.
The second technical scheme of the invention is realized by the following measures: the first paving type large-piece shaving composite blockboard can be prepared by the manufacturing method of the first paving type large-piece shaving composite blockboard.
Compared with the prior art, the invention has the following remarkable advantages and beneficial effects:
(1) the product has the advantages of low deformation, high surface flatness, high transverse static bending strength and log characteristic reservation;
(2) the production process is simple and the production efficiency is high;
(3) wide raw material source and low production cost.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The invention is further described below with reference to the following examples:
the first embodiment is as follows: a method for manufacturing a first-paved veneer large-sized wood chip composite core-board comprises the following steps:
s1: preparing wood fine materials: preparing wood fine materials, and mixing and stirring the wood fine materials and the adhesive uniformly;
s2: preparing large-piece wood shavings: preparing large-piece wood shavings, and mixing and stirring the large-piece wood shavings and the adhesive uniformly;
s3: preparing a core layer: the core layer is formed by splicing wood laths;
s4: paving: paving the fine wood materials, the large wood shavings, the core layer, the large wood shavings and the fine wood materials on a paving line from bottom to top in sequence to form a plate blank with a five-layer structure comprising a lower surface layer, a next lower surface layer, the core layer, a last surface layer and an upper surface layer from bottom to top, wherein the large wood shavings are directionally paved in a crisscross mode or are uniformly paved;
s5: and (3) compression molding: and carrying out hot pressing on the plate blank.
The existing wood shaving facing core-board technology is that glue-containing wood shavings are directly paved on the upper and lower surfaces of the core board, and then hot pressing is carried out, however, because the wood laths of the core board are laterally pressed when being spliced, the adhesive is coated on the side surfaces of the wood laths, when hot pressing is carried out, because the hot pressing pressure is larger, the compression amount of the base material of the core board is larger, and the wood shavings on the surface layer do not have enough static bending strength to support the structure of the side stress when being pressed, the deformation of the finished board is easily caused, the thickness of the whole board is different, the transverse static bending strength is lower, the quality is poor, and the application requirement of the standard is not satisfied, but the present application forms the previous surface layer and the next surface layer by large pieces of wood shavings on the upper surface layer and the lower surface layer of the core layer, therefore, the previous surface layer has high static bending strength and the next surface layer, and has the defect that enough transverse stress to support the insufficient transverse strength of the core layer, thereby avoiding the occurrence of large deformation of the finished board, bubbling of the board surface, cracking and the like caused by large compression amount during hot pressing of the core layer; the surface of the wood chip is paved with the wood fine material, the wood fine material has high surface flatness after the wood chip is pressed and formed due to small granularity, and therefore the wood fine material can be directly processed in a facing way. Specifically, the specific manufacturing process of splicing the core layer by the wood laths in the step S3 is as follows: firstly, wood is made into wood battens, the wood battens are dried, then the wood battens are subjected to plate preparation and gluing treatment, the gluing surfaces are the side edges of the wood battens, and then the glued wood battens are sent into a plate splicing machine for plate splicing to obtain the core layer. According to the requirement, the wood fine material can be produced by waste veneers, twigs, sawdust and the like, the large wood shavings can be produced by branch materials such as small diameter wood, twigs and the like, and according to the requirement, the following steps can be carried out after the step S5: s6: after hot pressing is finished, cooling the plate turning frame for 20min, stacking, storing plate blanks, externally checking and seeing appearance defects, and removing waste plates such as bulging, bubbling and deformation; s7: and naturally curing the plate blank for more than 7 days, sanding and sawing the plate blank to a fixed thickness, wherein the problems of sand leakage, damage and the like cannot occur on the outer inspection plate surface, and the error of the plate surface thickness is +/-0.2 mm to obtain a finished plate.
The first embodiment can be further optimized or/and improved according to actual needs:
preferably, the length of the large-piece wood shavings is 6cm to 10cm, the width of the large-piece wood shavings is 1cm to 3cm, the thickness of the large-piece wood shavings is 0.25mm to 0.45mm, and the paving thickness of the previous surface layer and the next surface layer is 4mm to 6 mm. The large-piece wood shavings have large size and thin thickness, and the previous surface layer and the next surface layer which are paved by the large-piece wood shavings have high static bending strength and high bonding strength, and have enough transverse stress to support the defect of insufficient transverse strength of the core layer.
Specifically, the large-piece wood shavings are directionally paved in a criss-cross mode, and the next surface layer and the last surface layer after hot pressing are both of directional wood shavings plate structures. The large chips are paved in a criss-cross oriented manner, namely the large chips are paved into a multilayer structure, between every two adjacent layers of structures, the large chips on one layer are longitudinally arranged according to the fiber direction of the large chips, and the large chips on the other layer are transversely arranged according to the fiber direction of the large chips, so that the previous surface layer and the next surface layer formed by paving the large chips in the criss-cross oriented manner have the characteristics of high static bending strength and high gluing strength, the deformation of the core layer can be avoided during pressing, and the product quality is ensured. In this embodiment, the top layer and the bottom layer are equally divided into the top layer, the middle layer and the bottom layer, the large pieces of wood shavings of the top layer and the bottom layer are paved in a transverse orientation, and the large pieces of wood shavings of the middle layer are paved in a longitudinal orientation.
Specifically, in the step S1, the wood fines quality requirement is as follows: the size of the screen: 1.4mm or less and 0.11mm or more and 0.11mm or more, wherein the adhesive can be any one or a combination of polyurethane adhesive, MDI adhesive and trioxane adhesive, the glue application amount of the adhesive is 10-28% of the weight of the wood fines, a waterproof agent and a curing agent are added into the wood fines, the addition amount of the waterproof agent is 1-2.5% of the weight of the wood fines, the addition amount of the curing agent is 1-2% of the weight of the wood fines, and the water content of the wood fines is controlled to be 10-13%; the paving amount of the wood fine materials on the upper surface layer and the lower surface layer is 0.8kg/m 2-4.5 kg/m2, and the paving thickness of the upper surface layer and the lower surface layer is 4 mm-6 mm. The wood fine material has small particle size, the surface flatness is high after compression molding, and the wood fine material can be directly subjected to surface decoration processing, the waterproof agent can be a paraffin emulsion waterproof agent according to requirements, the curing agent can be an ammonium chloride curing agent, and additives such as a flame retardant, an antibacterial agent, a mildew preventive, an insect repellent and the like can be added according to specific requirements, in the embodiment, the adhesive is a polyurethane adhesive, the glue application amount of the adhesive is 10% of the weight of the wood fine material, the waterproof agent and the curing agent are added into the wood fine material, the adding amount of the waterproof agent is 1% of the weight of the wood fine material, the adding amount of the curing agent is 1% of the weight of the wood fine material, and the water content of the wood fine material is controlled at 10%; the paving amount of the wood fine materials on the upper surface layer and the lower surface layer is 0.8kg/m2, and the paving thickness of the upper surface layer and the lower surface layer is 4 mm.
Specifically, in the step S2, the adhesive may be any one or a combination of several of a polyurethane adhesive, an MDI adhesive, and a "trialdehyde glue", where the glue application amount of the adhesive is 10% to 28% of the weight of the large-piece wood shavings, a waterproofing agent and a curing agent are added to the large-piece wood shavings, the addition amount of the waterproofing agent is 1% to 2.5% of the weight of the large-piece wood shavings, the addition amount of the curing agent is 1% to 2% of the weight of the large-piece wood shavings, and the water content of the large-piece wood shavings is controlled to be 5% to 8%; in the step S4, the paving amount of the big chips on the previous surface layer and the next surface layer is 1.2kg/m 2-5.5 kg/m 2. According to the requirement, the waterproof agent can be a paraffin emulsion waterproof agent, the curing agent can be an ammonium chloride curing agent, and additives such as a flame retardant, an antibacterial agent, a mildew preventive, an insect repellent and the like can be added according to the specific requirement, in the embodiment, the adhesive is a polyurethane adhesive, the glue application amount of the adhesive is 10% of the weight of the large-piece wood shavings, the addition amount of the waterproof agent is 1% of the weight of the large-piece wood shavings, the addition amount of the curing agent is 1% of the weight of the large-piece wood shavings, and the water content of the large-piece wood shavings is controlled to be 5%; in step S4, the amount of the big chips on the previous surface layer and the next surface layer is 1.2kg/m 2.
Specifically, in step S3, the core layer may be a core board or a core board; the length of the core layer is 2450mm to 2750mm, the width of the core layer is 1250mm to 1350mm, the thickness of the core layer is 12mm to 20mm, the upper surface and the lower surface of the core layer are glued, and the single-side gluing amount is 100g/m2 to 150g/m 2. The shape of the log is kept, the log has natural environmental protection performance, and the core layer is subjected to double-sided gluing, so that the bonding strength of the interfaces between the previous surface layer and the next surface layer and between the core layers is enhanced, and the product quality is improved; the length of the core layer is 2450mm, the width of the core layer is 1250mm, the thickness of the core layer is 12mm, the upper surface and the lower surface of the core layer are glued, and the single-side gluing amount is 100g/m 2.
Specifically, the specific process of hot-pressing the slab in the step S5 may be: prepressing the plate blank firstly, and then carrying out high-temperature hot pressing on the prepressed plate blank, wherein the hot pressing temperature is 140-180 ℃, and the actual unit pressure and the hot pressing time are divided into five sections, one section: 0MPa to 1.0MPa, 20 s; and (2) second stage: 1.0MPa to 0.8MPa for 20 s; and (3) three stages: 0.8MPa to 0.5MPa for 30 s; and a fourth stage: 0.5MPa for 60 s; five stages: 0.5MPa to 0.0MPa for 60 s. Therefore, the product after compression molding has a more stable structure.
Example two: the present embodiment is different from the first embodiment only in that: the large-piece wood shavings are uniformly paved, the number of the transverse large-piece wood shavings accounts for 40 to 55 percent of the total amount of the large-piece wood shavings, and the number of the longitudinal large-piece wood shavings accounts for 45 to 60 percent of the total amount of the large-piece wood shavings. The last surface layer and the next surface layer formed after large pieces of wood shavings are uniformly paved have high static bending strength and high bonding strength, and have enough transverse stress to support the defect of insufficient transverse strength of the core layer, so that the defects of cracking, deformation of the board surface and insufficient transverse static bending strength of the board after hot pressing are overcome.
Example three: the first paved large-sized wood shaving composite block board is prepared by the method for manufacturing the first paved large-sized wood shaving composite block board capable of being decorated. The first-paved veneerable large-piece shaving composite core-board has a five-layer structure, the upper surface layer and the lower surface layer are directly hot-pressed and molded by glue-containing wood fine materials, so that the surface flatness of the board is high, direct veneering processing can be realized, the last surface layer and the next surface layer are composed of glue-containing large-piece shavings, the first-time surface layer and the next-time surface layer have the advantages of high static bending strength and high gluing strength, enough transverse stress is provided to support the defect that the transverse strength of the core layer is insufficient, and the defects of cracking, board surface deformation and insufficient transverse static bending strength of the board after hot pressing are overcome.
Comparative example four: a method for manufacturing a veneer-faced wood shaving composite core-board comprises the following steps:
s1: preparing wood fine materials: preparing wood fine materials, and mixing and stirring the wood fine materials and the adhesive uniformly;
s2: preparing a core layer: the core layer is formed by splicing wood laths;
s3: paving: paving the fine wood material, the core layer and the fine wood material on a paving line from bottom to top in sequence to form a plate blank with a three-layer structure comprising a lower surface layer, a core layer and an upper surface layer from bottom to top in sequence,
s4: and (3) pressing and forming: and carrying out hot pressing on the plate blank.
With reference to the standard of GB/T17657-.
The technical characteristics form the best embodiment of the invention, the best embodiment has stronger adaptability and best implementation effect, and unnecessary technical characteristics can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (9)
1. A method for manufacturing a first-paving type veneered large-piece shaving composite core-board is characterized by comprising the following steps:
s1: preparing wood fine materials: preparing wood fine materials, and mixing and stirring the wood fine materials and the adhesive uniformly;
s2: preparing large-piece wood shavings: preparing large-piece wood shavings, and mixing and stirring the large-piece wood shavings and the adhesive uniformly;
s3: preparing a core layer: the core layer is formed by splicing wood laths;
s4: paving: paving the wood fine material, the large wood shavings, the core layer, the large wood shavings and the wood fine material on a paving line from bottom to top in sequence to form a plate blank with a five-layer structure of a lower surface layer, a lower sub-surface layer, the core layer, a last sub-surface layer and an upper surface layer from bottom to top, wherein the large wood shavings are paved in a crisscross and oriented manner or are uniformly paved;
s5: and (3) compression molding: and carrying out hot pressing on the plate blank.
2. The method of making a pre-paved veneered large-piece particle board according to claim 1, wherein the large-piece particle board has a length of 6cm to 10cm, a width of 1cm to 3cm, a thickness of 0.25mm to 0.45mm, and a thickness of 4mm to 6mm for both the previous and next surfaces.
3. The method of claim 1 or 2, wherein the wood chips are laid in criss-cross orientation, and the next and last surfaces after hot pressing are all of oriented wood chip board structure.
4. The method of making a pre-laid veneerable large-piece particle board according to claim 1 or 2, wherein the large-piece particles are laid uniformly, and the number of transverse large-piece particles is 40% to 55% of the total amount of the large-piece particles, and the number of longitudinal large-piece particles is 45% to 60% of the total amount of the large-piece particles.
5. The method of manufacturing a ready-to-spread veneered large-piece particle board as claimed in claim 1 or 2 or 3 or 4, wherein in step S1, the wood fines quality requirement is as follows: the size of the sieving net is as follows: the adhesive can be any one or combination of polyurethane adhesive, MDI adhesive and trialdehyde adhesive, the glue application amount of the adhesive is 10-28% of the weight of the wood fines, a waterproof agent and a curing agent are added into the wood fines, the addition amount of the waterproof agent is 1-2.5% of the weight of the wood fines, the addition amount of the curing agent is 1-2% of the weight of the wood fines, and the water content of the wood fines is controlled to be 10-13%; in step S4, the paving amount of the wood fine materials on the upper surface layer and the lower surface layer is 0.8kg/m 2-4.5 kg/m2, and the paving thickness of the upper surface layer and the lower surface layer is 4 mm-6 mm.
6. The method for manufacturing the pre-paved veneered large-piece wood shaving composite core-board according to claim 1, 2, 3, 4 or 5, wherein in the step S2, the adhesive can be any one or a combination of polyurethane adhesive, MDI adhesive and trialdehyde adhesive, the glue application amount of the adhesive is 10-28% of the weight of the large-piece wood shavings, a waterproof agent and a curing agent are added into the large-piece wood shavings, the adding amount of the waterproof agent is 1-2.5% of the weight of the large-piece wood shavings, the adding amount of the curing agent is 1-2% of the weight of the large-piece wood shavings, and the water content of the large-piece wood shavings is controlled to be 5-8%; in the step S4, the paving amount of the big chips on the previous surface layer and the next surface layer is 1.2kg/m 2-5.5 kg/m 2.
7. The method of manufacturing a surface mountable large-piece particle board as claimed in claim 1, 2, 3, 4, 5 or 6, wherein in step S3, the core layer is a core board or a core board; the length of the core layer is 2450mm to 2750mm, the width of the core layer is 1250mm to 1350mm, the thickness of the core layer is 12mm to 20mm, the upper surface and the lower surface of the core layer are glued, and the single-side gluing amount is 100g/m2 to 150g/m 2.
8. The method of manufacturing a pre-paved veneerable large-piece particle board according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the step of S5 comprises the steps of: prepressing the plate blank firstly, and then carrying out high-temperature hot pressing on the prepressed plate blank, wherein the hot pressing temperature is 140-180 ℃, and the actual unit pressure and the hot pressing time are divided into five sections, one section: 0MPa to 1.0MPa, 20 s; and (2) second stage: 1.0MPa to 0.8MPa for 20 s; and (3) three stages: 0.8MPa to 0.5MPa for 30 s; and a fourth stage: 0.5MPa for 60 s; five stages: 0.5MPa to 0.0MPa for 60 s.
9. A ready-to-pave veneerable large-piece particle board made by the method of making a ready-to-pave veneerable large-piece particle board as claimed in any one of claims 1 to 8.
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