CN114833902A - Method for manufacturing full-automatic quick aldehyde-free laminated veneer - Google Patents
Method for manufacturing full-automatic quick aldehyde-free laminated veneer Download PDFInfo
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- CN114833902A CN114833902A CN202210412236.0A CN202210412236A CN114833902A CN 114833902 A CN114833902 A CN 114833902A CN 202210412236 A CN202210412236 A CN 202210412236A CN 114833902 A CN114833902 A CN 114833902A
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- base material
- plywood
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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
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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
- B27D1/04—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
-
- 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
- B27D1/083—Presses specially designed for making the manufacture of shaped plywood articles
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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
- B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
- B27D5/006—Trimming, chamfering or bevelling edgings, e.g. lists
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G11/00—Applying adhesives or glue to surfaces of wood to be joined
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G35/00—Mechanical conveyors not otherwise provided for
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
Abstract
A full-automatic rapid manufacturing method for pressing and pasting veneer without aldehyde addition belongs to the technical field of plate preparation. The manufacturing method adopts a full-automatic equipment process technology and a continuous facing veneer facing process matched with a main line base material; the 40 layers of plates automatically enter and exit the hot pressing, and the high-temperature quick curing type pressing and pasting has the characteristics of high quality, high efficiency and high stability; the method has the advantages that the industrial production can be implemented in a manufacturing mode, the production efficiency is greatly improved, the product quality is guaranteed, meanwhile, the aldehyde-free adhesive is used for thoroughly realizing the aldehyde-free addition of the veneer, and the characteristic of reaching the national environmental protection standard is achieved.
Description
Technical Field
The invention belongs to the technical field of plate preparation, and particularly relates to a method for manufacturing a full-automatic quick laminated veneer board without aldehyde addition.
Background
With the continuous development of society, the wood industry is also rapidly developing, and as an important wood product in the wood industry, the development condition of the plywood is concerned by people because the plywood is closely related to the life of people, the plywood is a plate-shaped material formed by rotary cutting a wood section into a veneer or slicing a batten into thin wood, then gluing the veneer by using an adhesive, and the fiber directions of the veneers of the adjacent layers are mutually vertical to each other.
Aiming at the serious influence of formaldehyde on human health, China strictly regulates the formaldehyde emission in plywood products, the mandatory standard GB18580-2001 is issued in 1.1.2002 for the formaldehyde emission limit in artificial boards for interior decoration and finishing materials and products thereof, and products which do not meet the national standard stop being sold in the market from 7.1.2002, so that the problem of formaldehyde emission of plywood is not small.
When the existing plywood is prepared, the formaldehyde-containing adhesive is adopted, so that the formaldehyde release amount of the prepared plywood exceeds the standard and is harmful to human health, meanwhile, in the preparation process, the automation degree is low, a large amount of manpower resources are needed, the process continuity is poor, the working efficiency is low, and the gluing strength of the plywood is easy to bulge.
Disclosure of Invention
Aiming at the problems, the invention provides a full-automatic and rapid manufacturing method for pressing and pasting veneer veneers without aldehyde addition.
The technical scheme of the invention is as follows: a full-automatic rapid manufacturing method for laminating veneer without aldehyde addition comprises the following steps:
s1, preparing the base material of the formaldehyde-free plywood through continuous hot pressing by a main line, then curing for 5-7d, and after the stress of the base material of the formaldehyde-free plywood is released, performing fixed-thickness sanding by adopting one-time double-sided sand and two sets of single-sided sanding;
s2, stacking the formaldehyde-free plywood base materials, using veneers as gluing materials, then coating adhesives on the surfaces of the veneers by using a gluing roller, and then sequentially pasting the veneers on the gluing materials to form veneering plate blanks;
s3, conveying the veneering plate blank into a double-platform cold press by utilizing a feeding and discharging power ground rolling line, and carrying out cold pressing treatment for 20-30min under the condition that the pressure is 0.1-0.5MPa so as to accelerate the primary bonding of the veneering plate blank;
s4, trimming the cold-pressed veneering plate blank by using a single long and short side saw blade by using an automatic cutting device, and absorbing trimmed crushed materials;
s5, automatically putting the trimmed plate core into a 40-layer full-automatic veneering hot press, and carrying out hot pressing treatment for 4-5min under the condition that the pressure is 0.3-0.8MPa, wherein the hot pressing temperature is 105-115 ℃;
s6, overturning the veneering plate blank subjected to hot pressing through a double-station automatic vertical cooling plate frame system to realize finished product cooling, and then continuously stacking large and small plates without stopping by matching a three-station automatic uninterrupted plate collecting system with a protection plate automatic distribution line through a conveying frame to finish stacking the veneering plate blank;
and S7, carrying out a 24-hour curing period on the stacked veneering base material, and finally, polishing the base material panel by using a sander to obtain the aldehyde-free added laminated veneer.
Further, in the step S2, the veneer may be any one of peach blossom core, sapelli, water ash, birch and beech, and has a thickness of 0.2-0.6mm, a water content of 8-12%, and a density of>0.65Kg/m 3 。
Further, in the step S2, the adhesive is two-component polyurethane adhesive, the coating quantity of the adhesive is 130-150 g/square meter, and the two-component polyurethane adhesive is aldehyde-free additive adhesive, so that aldehyde-free release of the face plywood can be realized, and the environmental protection grade E1 is met.
Further, the two-component polyurethane adhesive is formed by mixing a component A and a component B in a volume ratio of 2-10:1, wherein the component A comprises the following components in parts by weight: 30-50 parts of polyol, 1-10 parts of a small molecular diol chain extender, 1-10 parts of alkynol, 0.01-0.015 part of a metal catalyst, 0.2-2 parts of a silane coupling agent and 30-80 parts of a filler, wherein the functionality of the polyol is 2-4, and the functionality of the alkynol is 1-4; the component B comprises the following components: 5-10 parts of diphenylmethane polyisocyanate and 0.2-1 part of water, wherein the component B mainly has a curing enhancing effect, and the water is very little.
Further, in step S2, when the sizing roller is used to coat the adhesive on the surface of the facing material, a coating method of mixing glue pouring and glue rolling is adopted, and the specific steps are as follows:
s2-1, grabbing the stacked formaldehyde-free added plywood base material to a conveying roller table by using a sucker on a keel frame to serve as a gluing material, using veneer as a facing material, and using two-component polyurethane as a bonding material between the gluing material and the facing material;
s2-1, gluing by a glue pouring and threaded double-roller double-side glue spreader, sequentially and orderly pasting veneers on a plywood substrate by matching and using continuous manual work to form a veneered slab, wherein a glue pouring port is mainly arranged at the upper part of a glue rolling machine, glue pouring achieves the purpose of glue saving by adjusting glue pouring amount, and a roller of the glue rolling machine is specially designed for upper glue pouring and lower glue rolling to achieve uniform glue application and wire drawing and increase initial viscosity.
Further, in step S1, the prepared aldehyde-free plywood substrate is pretreated, and the pretreatment process is as follows:
s1-1, after sanding the surface of the base material of the aldehyde-free plywood, removing dust, adjusting the water content of the base material of the aldehyde-free plywood to 5-8%, and then removing the compact layer on the surface of the base material of the aldehyde-free plywood;
s1-2, coating a flame retardant on the surface of the formaldehyde-free plywood base material, and then placing the plywood base material in a drying machine for drying in the sun through a conveyor belt until the water content is less than 35%, wherein the coating amount of the flame retardant is 150-160 g/square meter;
s1-3, placing the aldehyde-free added plywood base material subjected to the treatment in a plasma etching machine for etching treatment for 1-2h, then placing the base material in vacuum pressurization equipment, soaking the base material for 10-15h by using an etching agent under the condition that the pressure is 0.85-1.5MPa until the surface of the aldehyde-free added plywood base material forms a rough structure, finally placing the base material in a drying machine for drying through a conveyor belt, coating a flame retardant on the surface of the base material to enable the surface plywood to have a flame retardant effect, and meanwhile, etching the surface of the base material through plasma etching and the etching agent, so that the contact area between a veneering material and a gluing material can be increased, the gluing strength is improved, bulging or detachment of the veneering material is avoided, and the reliability of the veneer is improved.
Furthermore, the flame retardant is polysiloxane, and the etching agent is an acidic etching agent or an alkaline etching agent.
Further, in the step S1-3, the etching agent is coated on the surface of the plywood substrate without the aldehyde, and the coating area is in grid distribution, meanwhile, the etching area of the plasma etching machine coincides with the grid coating area of the etching agent, and the etching agent is coated through the grid area, so that the contact area between the veneering material and the gluing material can be increased, the gluing strength is improved, the using amount of the etching agent can be reduced, excessive residues of harmful substances are avoided, and the pollution to the air environment after volatilization and the harm to the health of workers are caused.
Further, in the step S7, the grain size of the sanding belt of the sanding machine is 180-200 meshes.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides a full-automatic quick manufacturing method for pressing and pasting veneer veneers without aldehyde addition.A full-automatic veneering production line device adopts a high-efficiency roller without aldehyde double-component polyurethane for gluing, so that the efficiency is improved and the glue is saved; the full-automatic veneering production line equipment realizes whole-line transportation and intelligent allocation through the linkage of the rail transport trolley, the materials do not fall to the ground, and people or equipment are not required to carry the materials; feeding is carried out through an intelligent plate stacking robot, so that the manual plate pressing and feeding process is omitted; cutting redundant veneer by adopting automatic edge cutting equipment; the veneering is efficiently finished by adopting a 40-layer automatic board feeding hot pressing equipment system, and the formaldehyde release quantity limit value of the veneer veneered plywood laminated by formaldehyde-free addition is 0.03mg/m 3 The veneer facing of the board without aldehyde is really realized.
(2) Full-automatic equipment process technology, namely a continuous veneer facing process matched with a main line base material; the 40 layers of plates automatically enter and exit the hot pressing, and the high-temperature quick curing type pressing and pasting is high in quality, high in efficiency and high in stability; the method has the advantages that the rotary-cut veneer is pressed and attached to the aldehyde-free added base material, the manufacturing mode can be guaranteed to implement industrial production, the production efficiency is greatly improved, the product quality is guaranteed, and the national environmental protection standard is met.
(3) Through adding substrate surface coating fire retardant at no aldehyde, make face plywood possess flame retardant efficiency, and simultaneously, through carrying out the sculpture to no aldehyde addition substrate surface, can increase the area of contact of wainscot material and rubber coating material, improve bonding strength, avoid appearing swell or wainscot material and break away from, improve face plywood's reliability, through the mode of paining the etchant through latticed region, can increase the area of contact of wainscot material and rubber coating material, improve bonding strength, can reduce the use amount of etchant again, avoid harmful substance too much to remain, volatilize back to air environmental pollution, cause harm to staff's health.
Detailed Description
In order to further understand the contents of the present invention, the present invention is described in detail by examples below.
Example 1
A full-automatic rapid manufacturing method for laminating veneer without aldehyde addition comprises the following steps:
s1, preparing the plywood base material without the aldehyde addition through continuous hot pressing of a main line, then curing for 5d, and after the stress of the plywood base material without the aldehyde addition is released, performing fixed-thickness sanding by adopting one-time double-sided sand and two groups of single-sided sanding;
s2, stacking the veneer base materials without aldehyde addition, using veneers as gluing materials, then coating isocyanate on the surfaces of the veneers by using a gluing roller, and sequentially pasting the veneers on the gluing materials to form veneered plate blanks, wherein the veneers can be any one of peach blossom cores, sapelli, northash, birch and beech, the thickness of the veneers is 0.2mm, the water content is 8%, and the density of the veneers is 0.2mm>0.65Kg/m 3 ；
S3, conveying the veneering plate blank into a double-platform cold press by utilizing a feeding and discharging power ground rolling line, and carrying out cold pressing treatment for 30min under the condition that the pressure is 0.1MPa so as to accelerate the primary bonding of the veneering plate blank;
s4, trimming the cold-pressed veneering plate blank by using a single long and short side saw blade by using an automatic cutting device, and absorbing the trimmed crushed materials;
s5, automatically putting the trimmed board core into a 40-layer full-automatic veneering hot press, and carrying out hot pressing treatment for 4min under the condition that the pressure is 0.3MPa, wherein the hot pressing temperature is 105 ℃;
s6, turning the veneering plate blank subjected to hot pressing through a double-station automatic vertical cold plate frame system to realize finished product cooling, and then continuously stacking large and small plates without stopping the machine through a conveying frame by matching a three-station automatic uninterrupted plate collecting system with a protection plate automatic distribution line to finish stacking of the veneering plate blank;
s7, carrying out a 24-hour curing period on the stacked veneering base material, and finally, polishing the base material panel through a sander to obtain the aldehyde-free added laminated veneer, wherein the grain size of a sanding belt of the sander is 180 meshes.
Example 2
A full-automatic rapid manufacturing method for laminating veneer without aldehyde addition comprises the following steps:
s1, preparing the base material of the gluing board without aldehyde addition through continuous hot pressing of a main line, then curing for 6d, and after the stress of the base material of the gluing board without aldehyde addition is released, performing fixed-thickness sanding by adopting one-time double-sided sand and two sets of single-sided sanding;
s2, stacking the veneer base materials without aldehyde addition, using veneers as gluing materials, then coating isocyanate on the surfaces of the veneers by using a gluing roller, and sequentially pasting the veneers on the gluing materials to form veneered plate blanks, wherein the veneers can be any one of peach blossom cores, sapelli, northash, birch and beech, the thickness of the veneers is 0.4mm, the water content is 10%, and the density of the veneers is 0.4mm>0.65Kg/m 3 ；
S3, conveying the veneered plate blank into a double-platform cold press by utilizing a feeding and discharging power ground rolling line, and carrying out cold pressing treatment for 25min under the condition that the pressure is 0.3MPa so as to accelerate the primary bonding of the veneered plate blank;
s4, trimming the cold-pressed veneering plate blank by using a single long and short side saw blade by using an automatic cutting device, and absorbing the trimmed crushed materials;
s5, automatically putting the trimmed board core into a 40-layer full-automatic veneering hot press, and carrying out hot pressing treatment for 4.5min under the condition that the pressure is 0.5MPa, wherein the hot pressing temperature is 110 ℃;
s6, overturning the veneering plate blank subjected to hot pressing through a double-station automatic vertical cooling plate frame system to realize finished product cooling, and then continuously stacking large and small plates without stopping by matching a three-station automatic uninterrupted plate collecting system with a protection plate automatic distribution line through a conveying frame to finish stacking the veneering plate blank;
s7, carrying out a 24-hour curing period on the stacked veneering base material, and finally, polishing the base material panel through a sander to obtain the aldehyde-free added laminated veneer, wherein the abrasive belt of the sander has a particle size specification of 200 meshes.
Example 3
A full-automatic rapid manufacturing method for laminating veneer without aldehyde addition comprises the following steps:
s1, preparing the base material of the gluing board without aldehyde addition through continuous hot pressing of a main line, then curing for 7d, and after the stress of the base material of the gluing board without aldehyde addition is released, performing fixed-thickness sanding by adopting one-time double-sided sand and two sets of single-sided sanding;
s2, stacking the veneer base materials without aldehyde addition, using veneers as gluing materials, then coating isocyanate on the surfaces of the veneers by using a gluing roller, and sequentially pasting the veneers on the gluing materials to form veneered plate blanks, wherein the veneers can be any one of peach blossom cores, sapelli, northash, birch and beech, the thickness of the veneers is 0.6mm, the water content is 12%, and the density of the veneers is 0.6mm>0.65Kg/m 3 ；
S3, conveying the veneering plate blank into a double-platform cold press by utilizing a feeding and discharging power ground rolling line, and carrying out cold pressing treatment for 20min under the condition that the pressure is 0.5MPa so as to accelerate the primary bonding of the veneering plate blank;
s4, trimming the cold-pressed veneering plate blank by using a single long and short side saw blade by using an automatic cutting device, and absorbing the trimmed crushed materials;
s5, automatically putting the trimmed plate core into a 40-layer full-automatic veneering hot press, and carrying out hot pressing treatment for 5min under the condition that the pressure is 0.8MPa, wherein the hot pressing temperature is 115 ℃;
s6, turning the veneering plate blank subjected to hot pressing through a double-station automatic vertical cold plate frame system to realize finished product cooling, and then continuously stacking large and small plates without stopping the machine through a conveying frame by matching a three-station automatic uninterrupted plate collecting system with a protection plate automatic distribution line to finish stacking of the veneering plate blank;
s7, carrying out a 24-hour curing period on the stacked veneering base material, and finally, polishing the base material panel through a sander to obtain the aldehyde-free added laminated veneer, wherein the abrasive belt of the sander has a particle size specification of 200 meshes.
Example 4
This example is substantially the same as example 3, except that:
in the step S2, the isocyanate can be replaced by two-component polyurethane adhesive, and the coating quantity of the two-component polyurethane adhesive is 130g per square meter;
the two-component polyurethane adhesive is formed by mixing a component A and a component B in a volume ratio of 2:1, wherein the component A comprises the following components in parts by weight: 30 parts of polyol, 1 part of a small-molecular diol chain extender, 1 part of alkynol, 0.01 part of a metal catalyst, 0.2 part of a silane coupling agent and 30 parts of a filler, wherein the functionality of the polyol is 2, and the functionality of the alkynol is 1; the component B comprises the following components: 5 parts of diphenylmethane polyisocyanate and 0.2 part of water.
Example 5
This example is substantially the same as example 3, except that:
in the step S2, replacing isocyanate with two-component polyurethane adhesive, wherein the coating quantity of the two-component polyurethane adhesive is 130-inch and 150g per square meter;
the two-component polyurethane adhesive is formed by mixing a component A and a component B in a volume ratio of 8:1, wherein the component A comprises the following components in parts by weight: 40 parts of polyol, 9 parts of a small-molecular-weight diol chain extender, 5 parts of alkynol, 0.013 part of a metal catalyst, 1 part of a silane coupling agent and 50 parts of a filler, wherein the functionality of the polyol is 3, and the functionality of the alkynol is 2; the component B comprises the following components: 8 parts of diphenylmethane polyisocyanate and 0.6 part of water
Example 6
This example is substantially the same as example 3, except that:
in the step S2, the isocyanate can be replaced by two-component polyurethane adhesive, and the smearing quantity of the two-component polyurethane adhesive is 150g per square meter;
the two-component polyurethane adhesive is formed by mixing a component A and a component B in a volume ratio of 10:1, wherein the component A comprises the following components in parts by weight: 50 parts of polyol, 10 parts of a small-molecular-weight diol chain extender, 10 parts of alkynol, 0.015 part of a metal catalyst, 2 parts of a silane coupling agent and 80 parts of a filler, wherein the functionality of the polyol is 4, and the functionality of the alkynol is 4; the component B comprises the following components: 10 parts of a diphenylmethane polyisocyanate, 1 part of water.
Example 7
This embodiment is substantially the same as embodiment 6 except that:
in the step S2, when the sizing roller is used to coat the adhesive on the surface of the facing material, a coating mode of mixing glue pouring and glue rolling is adopted, and the specific steps are as follows:
s2-1, grabbing the stacked formaldehyde-free added plywood base material to a conveying roller table by using a sucker on a keel frame to serve as a gluing material, using veneer as a facing material, and using two-component polyurethane as a bonding material between the gluing material and the facing material;
s2-1, gluing the veneer by using a glue pouring and threaded double-roller double-faced gluing machine, and sequentially and orderly pasting the veneer on the plywood substrate by matching and using continuous manual work to form a veneering plate blank.
Example 8
This example is substantially the same as example 7 except that:
in step S1, the prepared plywood base material without aldehyde addition is pretreated, and the pretreatment process is as follows:
s1-1, after sanding the surface of the base material of the aldehyde-free plywood, removing dust, adjusting the water content of the base material of the aldehyde-free plywood to 5%, and then removing the compact layer on the surface of the base material of the aldehyde-free plywood;
s1-2, coating polysiloxane on the surface of the aldehyde-free plywood substrate, and airing in an airing machine through a conveyor belt until the water content is 35%, wherein the coating amount of the flame retardant is 150 g/square meter;
s1-3, placing the treated formaldehyde-free added plywood base material in a plasma etching machine for etching treatment for 1h, then placing the plywood base material in vacuum pressurization equipment, soaking the plywood base material for 10h by using Cu (OH) Cl under the condition that the pressure is 0.85MPa until the surface of the formaldehyde-free added plywood base material forms a rough structure, and finally placing the plywood base material in a drying machine for drying by a conveyor belt, wherein Cu (OH) Cl can also be coated on the surface of the formaldehyde-free added plywood base material, the coating area is in grid distribution, and meanwhile, the etching area of the plasma etching machine is superposed with the grid coating area of an etching agent.
Example 9
This example is substantially the same as example 7 except that:
in step S1, the prepared aldehyde-free plywood substrate is pretreated, and the pretreatment process is as follows:
s1-1, after sanding the surface of the base material of the aldehyde-free plywood, removing dust, adjusting the water content of the base material to 7%, and then removing the compact layer on the surface of the base material of the aldehyde-free plywood;
s1-2, coating polysiloxane on the surface of the aldehyde-free plywood substrate, and airing in an airing machine through a conveyor belt until the water content is 34%, wherein the coating amount of the flame retardant is 155 g/square meter;
s1-3, placing the treated formaldehyde-free added plywood base material in a plasma etching machine for etching treatment for 1.5h, then placing the plywood base material in vacuum pressurization equipment, soaking the plywood base material for 13h by using Cu (OH) Cl under the condition that the pressure is 1MPa until the surface of the formaldehyde-free added plywood base material forms a rough structure, and finally placing the plywood base material in a drying machine for drying by a conveyor belt, wherein Cu (OH) Cl can also be coated on the surface of the formaldehyde-free added plywood base material, the coating area is in grid distribution, and meanwhile, the etching area of the plasma etching machine is superposed with the grid coating area of an etching agent.
Example 10
This example is substantially the same as example 7 except that:
in step S1, the prepared aldehyde-free plywood substrate is pretreated, and the pretreatment process is as follows:
s1-1, after sanding the surface of the base material of the aldehyde-free plywood, removing dust, adjusting the water content of the base material of the aldehyde-free plywood to 8%, and then removing the compact layer on the surface of the base material of the aldehyde-free plywood;
s1-2, coating polysiloxane on the surface of the aldehyde-free plywood substrate, and airing in an airing machine through a conveyor belt until the water content is 33%, wherein the coating amount of the flame retardant is 160 g/square meter;
s1-3, placing the treated formaldehyde-free added plywood base material in a plasma etching machine for etching treatment for 2h, then placing the plywood base material in vacuum pressurization equipment, soaking the plywood base material for 15h by using Cu (OH) Cl under the condition that the pressure is 1.5MPa until the surface of the formaldehyde-free added plywood base material forms a rough structure, and finally placing the plywood base material in a drying machine for drying by a conveyor belt, wherein Cu (OH) Cl can also be coated on the surface of the formaldehyde-free added plywood base material, the coating area is in grid distribution, and meanwhile, the etching area of the plasma etching machine is superposed with the grid coating area of an etching agent.
Test examples
Using the conventional equipment and the equipment of examples 1-10, the aldehyde-free laminated veneer faced plywood was prepared with the following relevant performance parameters:
table 1: performance parameter Table for aldehyde-free addition laminated veneer veneered plywood prepared using conventional equipment and equipment procedures of examples 1-10
As can be seen from table 1, the aldehyde-free laminated wood veneer prepared by the conventional equipment process and the equipment processes of examples 1 to 10 has the advantages of less labor, less formaldehyde emission, high bonding strength and high environmental protection level, and the aldehyde-free laminated wood veneer prepared by the equipment processes of examples 1 to 10 has better performance than that of the prior art.
As can be seen by comparing examples 1-3, the aldehyde-free additive laminated veneer-faced plywood of example 3 has the best parameters, and thus the solution of example 3 is superior to examples 1 and 2.
As can be seen by comparing example 3 with examples 4-7, the aldehyde-free addition laminated veneer faced plywood of example 7 has the best parameters associated therewith, and thus the embodiment of example 7 is superior to that of example 3.
Comparing example 7 with examples 8-10, it can be seen that the aldehyde-free laminated veneer-faced plywood of example 10 has the best parameters, and thus the embodiment of example 10 is superior to example 7, indicating that example 10 is the best example.
Claims (9)
1. A full-automatic quick manufacturing method for laminating veneer without aldehyde addition is characterized by comprising the following steps:
s1, preparing the base material of the formaldehyde-free plywood through continuous hot pressing by a main line, then curing for 5-7d, and after the stress of the base material of the formaldehyde-free plywood is released, performing fixed-thickness sanding by adopting one-time double-sided sand and two sets of single-sided sanding;
s2, stacking the formaldehyde-free plywood base materials, using veneers as gluing materials, then coating adhesives on the surfaces of the veneers by using a gluing roller, and then sequentially pasting the veneers on the gluing materials to form veneering plate blanks;
s3, conveying the veneering plate blank into a double-platform cold press by utilizing a feeding and discharging power ground rolling line, and carrying out cold pressing treatment for 20-30min under the condition that the pressure is 0.1-0.5MPa so as to accelerate the primary bonding of the veneering plate blank;
s4, trimming the cold-pressed veneering plate blank by using a single long and short side saw blade by using an automatic cutting device, and absorbing the trimmed crushed materials;
s5, automatically putting the trimmed plate core into a 40-layer full-automatic veneering hot press, and carrying out hot pressing treatment for 4-5min under the condition that the pressure is 0.3-0.8MPa, wherein the hot pressing temperature is 105-115 ℃;
s6, turning the veneering plate blank subjected to hot pressing through a double-station automatic vertical cold plate frame system to realize finished product cooling, and then continuously stacking large and small plates without stopping the machine through a conveying frame by matching a three-station automatic uninterrupted plate collecting system with a protection plate automatic distribution line to finish stacking of the veneering plate blank;
and S7, carrying out a 24-hour curing period on the stacked veneering base material, and finally, polishing the base material panel by using a sander to obtain the aldehyde-free added laminated veneer.
2. The method as claimed in claim 1, wherein the veneer is selected from peach blossom core, sapelli, ash bark, birch and beech, and has a thickness of 0.2-0.6mm, a water content of 8-12%, and a density of 0.2-0.6mm in step S2>0.65Kg/m 3 。
3. The method for manufacturing the full-automatic quick formaldehyde-free addition laminated veneer plywood as claimed in claim 1, wherein in the step S2, the adhesive is a two-component polyurethane adhesive, and the coating amount of the adhesive is 150 g/square meter.
4. The method for manufacturing the full-automatic quick aldehyde-free added laminated veneer plywood according to claim 3, wherein the two-component polyurethane adhesive is formed by mixing a component A and a component B in a volume ratio of 2-10:1, and the component A comprises the following components in parts by weight: 30-50 parts of polyol, 1-10 parts of a small molecular diol chain extender, 1-10 parts of alkynol, 0.01-0.015 part of a metal catalyst, 0.2-2 parts of a silane coupling agent and 30-80 parts of a filler, wherein the functionality of the polyol is 2-4, and the functionality of the alkynol is 1-4; the component B comprises the following components: 5-10 parts of diphenylmethane polyisocyanate and 0.2-1 part of water.
5. The method of claim 3, wherein in step S2, when the adhesive is applied to the surface of the veneer material by the glue roller, the adhesive is applied by spraying and rolling, and the method comprises the following steps:
s2-1, grabbing the stacked formaldehyde-free added plywood base material to a conveying roller table by using a sucker on a keel frame to serve as a gluing material, using veneer as a facing material, and using two-component polyurethane as a bonding material between the gluing material and the facing material;
s2-1, gluing the veneer by a glue spraying and threaded double-roller double-faced gluing machine, and sequentially and orderly sticking the veneers on the plywood substrate by matching and using continuous manual work to form a veneering plate blank.
6. The method for manufacturing the fully-automatic and rapid aldehyde-free laminated veneer plywood according to claim 1, wherein in the step S1, the prepared aldehyde-free laminated veneer substrate is pretreated, and the pretreatment process comprises the following steps:
s1-1, after sanding the surface of the base material of the aldehyde-free plywood, removing dust, adjusting the water content of the base material of the aldehyde-free plywood to 5-8%, and then removing the compact layer on the surface of the base material of the aldehyde-free plywood;
s1-2, coating a flame retardant on the surface of the formaldehyde-free plywood base material, and then placing the plywood base material in a drying machine for drying in the sun through a conveyor belt until the water content is less than 35%, wherein the coating amount of the flame retardant is 150 plus 160 g/square meter;
s1-3, placing the treated formaldehyde-free added plywood base material in a plasma etching machine for etching treatment for 1-2h, then placing the base material in vacuum pressurization equipment, soaking the base material for 10-15h by using an etching agent under the condition that the pressure is 0.85-1.5MPa until the surface of the formaldehyde-free added plywood base material forms a rough structure, and finally placing the base material in a drying machine for drying through a conveyor belt.
7. The method as claimed in claim 6, wherein the fire retardant is polysiloxane, and the etchant is acidic etchant or alkaline etchant.
8. The method as claimed in claim 6, wherein in step S1-3, the etching agent is applied on the surface of the plywood substrate without the aldehyde additive, the applied area is in a grid-like distribution, and the etching area of the plasma etcher coincides with the grid-like applied area of the etching agent.
9. The method as claimed in claim 1, wherein in step S7, the sanding belt of the sanding machine has a particle size of 180-200 meshes.
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