CN110640851A - Preparation process and application of pine front core - Google Patents
Preparation process and application of pine front core Download PDFInfo
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- CN110640851A CN110640851A CN201910943032.8A CN201910943032A CN110640851A CN 110640851 A CN110640851 A CN 110640851A CN 201910943032 A CN201910943032 A CN 201910943032A CN 110640851 A CN110640851 A CN 110640851A
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08G12/34—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds and acyclic or carbocyclic compounds
- C08G12/36—Ureas; Thioureas
- C08G12/38—Ureas; Thioureas and melamines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/40—Chemically modified polycondensates
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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
- C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
- C09J161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C09J161/32—Modified amine-aldehyde condensates
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Abstract
The invention discloses a preparation process and application of a pine front core, which comprises the following steps: 1) processing the splicing surface of the pine board core into a sawtooth shape; 2) coating hot melt adhesive on the splicing surfaces of the pine board cores, and splicing more than one layer of pine board cores into a pine board in pairs after coating; 3) the assembled pine boards are stacked flatly in an environment with the temperature of 25-30 ℃ and the humidity of 60-70%, and are placed for 5-7 days; 4) coating a layer of putty on the surface of the stacked pine boards, then scraping, and sanding once to obtain the pine front core; the preparation process and the application of the pine front core can improve the yield of veneer production, reduce the cost and ensure the quality.
Description
Technical Field
The invention belongs to the technical field of plate processing, and particularly relates to a preparation process and application of a pine front core.
Background
A veneer board is a surface material for indoor decoration or furniture manufacture, which is made up of natural wood or technical wood through cutting into thin sheets with a certain thickness, adhering them to the surface of veneer board, and hot pressing.
Common veneers are divided into natural wood veneer veneers and artificial veneer veneers. The appearance difference between the artificial veneer overlay and the natural wood veneer overlay is that the texture of the artificial veneer overlay is basically straight texture or regular pattern; the latter is natural wood pattern, and the texture pattern is natural, and the variability is bigger, random. It is characterized in that: not only has beautiful patterns of wood, but also achieves the purposes of fully utilizing wood resources and reducing the cost.
The existing artificial veneer is mostly made of common rubber wood or pine front core, the veneer is easy to deform, the yield is low, and the yield is generally 30-40% in the industry, so that the produced veneer has higher cost and the quality is difficult to ensure.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation process of a pine front core and application thereof, which can improve the yield of veneer production, reduce the cost and ensure the quality.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a preparation process of a pine front core comprises the following steps:
1) processing the splicing surface of the pine board core into a sawtooth shape;
2) coating hot melt adhesive on the splicing surfaces of the pine board cores, and splicing more than one layer of pine board cores into a pine board in pairs after coating;
3) the assembled pine boards are stacked flatly in an environment with the temperature of 25-30 ℃ and the humidity of 60-70%, and are placed for 5-7 days;
4) and coating a layer of putty on the surface of the stacked pine boards, then scraping, and sanding once to obtain the pine front core.
Preferably, in the step 2), the coated hot melt adhesive is composed of the following raw materials in percentage by weight: 30-40% of formaldehyde, 30-40% of urea, 20-30% of melamine, 1-5% of caustic soda, 1-5% of polyvinyl alcohol and 1-5% of curing agent.
Further, in the step 2), the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 30% of formaldehyde, 40% of urea, 25% of melamine, 1% of caustic soda, 1% of polyvinyl alcohol and 3% of curing agent.
Further, in the step 2), the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 40% of formaldehyde, 35% of urea, 20% of melamine, 3% of caustic soda, 1% of polyvinyl alcohol and 1% of curing agent.
Further, in the step 2), the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 36% of formaldehyde, 35% of urea, 24% of melamine, 1% of caustic soda, 3% of polyvinyl alcohol and 1% of curing agent.
Furthermore, in the step 3), the moisture content of the flatly stacked pine boards is 6-12%.
Further, in step 4), the pine board subjected to the primary sanding is repeatedly coated with a layer of putty, then is strickled off, and is subjected to secondary sanding.
Further, in step 4), the pine board which is sanded twice is repeatedly coated with a layer of putty, then is strickled off, and is sanded three times.
The invention has the beneficial effects that:
the joint surfaces of the two-by-two spliced pine board cores are more firmly jointed through the splicing structure of the sawtooth surfaces, the front core of the veneer is pretreated to avoid the situation of splitting and deformation in the subsequent processing process, the hot melt adhesive is matched for jointing, the veneer is flatly stacked to be firmly adhered, the outer surface is coated with putty for sanding, the front core of the veneer is pretreated, the high-temperature laminated board can not be split by adopting the hot-splicing glue, the flatly stacked board is used for solving the deformation situation of the board, the surface of the board can be flatly repaired and sanded by surface repair and sanding, so that the qualified standard can be reached in the subsequent melamine laminating operation, the pine board core in the board can keep good joint degree and ensure the smoothness of the surface of the board in the subsequent processing process of laminating wood veneers and pressing, the conditions such as external deformation are not easy to occur, thereby achieving the effect of improving the yield.
Drawings
FIG. 1 is a schematic view of a straight sawtooth-shaped split surface structure of a pine front core according to the present invention;
FIG. 2 is a schematic view of a miter-saw-shaped split surface structure of a pine front core according to the present invention;
FIG. 3 is a schematic view of a symmetrical miter-saw-tooth-shaped split surface structure of a pine front core according to the present invention.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
Example one
Referring to fig. 1, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a straight sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 30% of formaldehyde, 40% of urea, 25% of melamine, 1% of caustic soda, 1% of polyvinyl alcohol and 3% of curing agent, and splicing more than one layer of pine board cores into a pine board after coating;
3) the assembled pine boards are stacked flatly at the temperature of 30 ℃ and the humidity of 70%, and are placed for 5-7 days until the moisture content of the pine boards is 6%;
4) and coating a layer of putty on the surface of the stacked pine boards, then scraping, and sanding once to obtain the pine front core.
The splicing surface of the pine board core is processed in a straight sawtooth shape, the processing mode is simple, but the bonding stability of the splicing surface is low, micro offset easily occurs in the lateral direction, but the phenomenon does not occur after pressing, a special hot melt adhesive is additionally adopted for bonding, the formaldehyde content in the hot melt adhesive reacts with urea to generate urea-formaldehyde resin, and the formaldehyde content is less than that of urea, so that the formaldehyde release amount of the hot melt adhesive prepared by the mode is lower, the formaldehyde release amount in the future is lower, and compared with the traditional cold glue bonding mode, the hot melt bonding mode has stronger flatness and can not generate the external deformation.
Example two
Referring to fig. 1, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a straight sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: formaldehyde 36%, urea 35%, melamine 24%, caustic soda 1%, polyvinyl alcohol 3%, curing agent 1%, and make more than one layer of pine board core pieced together two by two to form a pine board after coating;
3) the assembled pinewood boards are stacked flatly at the temperature of 25 ℃ and the humidity of 60%, the pinewood boards are placed for 5-7 days, and the pinewood boards are stacked flatly until the water content of the pinewood boards is 8%;
4) and coating a layer of putty on the surface of the stacked pine boards, then scraping, and sanding once to obtain the pine front core.
Compared with the embodiment 1, the hot melt adhesive adopted by the embodiment has higher content of formaldehyde in the adopted hot melt adhesive component, so that the urea-formaldehyde resin has stronger stability, the proportion of formaldehyde and urea is better, the urea-formaldehyde resin can be fully reacted into the urea-formaldehyde resin, no formaldehyde residue or only a little formaldehyde residue is left, the formaldehyde release amount in the future is lower, and compared with the traditional cold glue gluing mode, the hot melt gluing has stronger smoothness and can not generate the condition of external deformation.
EXAMPLE III
Referring to fig. 1, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a straight sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 40% of formaldehyde, 35% of urea, 20% of melamine, 3% of caustic soda, 1% of polyvinyl alcohol and 1% of curing agent, and splicing more than one layer of pine board cores into a pine board after coating;
3) the assembled pinewood boards are stacked flatly at the temperature of 25 ℃ and the humidity of 65%, the pinewood boards are placed for 5-7 days, and the pinewood boards are stacked flatly until the water content of the pinewood boards is 10%;
4) coating a layer of atomic ash on the surface of the stacked pine board, then leveling, sanding for the first time to obtain a front pine core, then repeatedly coating a layer of atomic ash on the pine board sanded for the first time, leveling, and sanding for the second time.
Compared with the embodiment 2, the formaldehyde content in the adopted hot melt adhesive component is higher, so that the urea-formaldehyde resin has stronger stability, formaldehyde and urea can fully react into the urea-formaldehyde resin, but a little formaldehyde residue exists, the formaldehyde release amount in the future is higher, and compared with the traditional cold glue gluing mode, the hot melt gluing has stronger smoothness and cannot generate the external deformation.
Example four
Referring to fig. 1, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a straight sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 40% of formaldehyde, 35% of urea, 20% of melamine, 3% of caustic soda, 1% of polyvinyl alcohol and 1% of curing agent, and splicing more than one layer of pine board cores into a pine board after coating;
3) the assembled pinewood boards are stacked flatly at the temperature of 25 ℃ and the humidity of 65%, the pinewood boards are placed for 5-7 days, and the pinewood boards are stacked flatly until the water content of the pinewood boards is 10%;
4) coating a layer of atomic ash on the surface of the stacked pine board, then leveling, sanding for the first time, repeatedly coating a layer of atomic ash on the pine board which is sanded for the first time, leveling, sanding for the second time, leveling, repeatedly coating a layer of atomic ash on the pine board which is sanded for the second time, leveling, sanding for the third time, and leveling to obtain the front pine core.
Compared with the embodiment 3, the embodiment adopts the process of sanding for three times, so that when the wood veneer is subsequently used for the veneer, the bonding effect of the surface of the pine board and the veneer is better, and the condition of external deformation is not easy to occur during pressing.
EXAMPLE five
Referring to fig. 2, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a bevel sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 30% of formaldehyde, 40% of urea, 25% of melamine, 1% of caustic soda, 1% of polyvinyl alcohol and 3% of curing agent, and splicing more than one layer of pine board cores into a pine board after coating;
3) the assembled pinewood boards are stacked flatly at the temperature of 25 ℃ and the humidity of 60%, the pinewood boards are placed for 5-7 days, and the pinewood boards are stacked flatly until the water content of the pinewood boards is 8%;
4) and coating a layer of putty on the surface of the stacked pine boards, then scraping, and sanding once to obtain the pine front core.
Compared with the embodiment 1, the split surfaces of the pine plate core are processed in the inclined sawtooth shape, the processing mode is complex, but the joint stability of the split surfaces is high, and the side direction and the vertical direction are not easy to slightly deviate.
EXAMPLE six
Referring to fig. 2, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a bevel sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 35% of formaldehyde, 35% of urea, 25% of melamine, 1% of caustic soda, 3% of polyvinyl alcohol and 1% of curing agent, and splicing more than one layer of pine board cores into a pine board after coating;
3) the assembled pinewood boards are stacked flatly at the temperature of 25 ℃ and the humidity of 70%, the pinewood boards are placed for 5-7 days, and the pinewood boards are stacked flatly until the water content of the pinewood boards is 10%;
4) and coating a layer of putty on the surface of the stacked pine boards, then scraping, and sanding once to obtain the pine front core.
Compared with the embodiment 5, the hot melt adhesive adopted by the embodiment has higher content of formaldehyde in the adopted hot melt adhesive component, so that the urea-formaldehyde resin has higher stability, the proportion of formaldehyde to urea is the same, the urea-formaldehyde resin can be fully reacted into the urea-formaldehyde resin, no formaldehyde residue or only a little formaldehyde residue is left, the formaldehyde release amount in the future is lower, and compared with the traditional cold glue gluing mode, the hot melt gluing has stronger smoothness and can not generate the condition of external deformation.
EXAMPLE seven
Referring to fig. 2, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a bevel sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 40% of formaldehyde, 30% of urea, 25% of melamine, 3% of caustic soda, 1% of polyvinyl alcohol and 1% of curing agent, and splicing more than one layer of pine board cores into a pine board after coating;
3) the assembled pine boards are stacked flatly in an environment with the temperature of 30 ℃ and the humidity of 60%, the pine boards are placed for 5-7 days, and the pine boards are stacked flatly until the water content of the pine boards is 12%;
4) and coating a layer of putty on the surface of the stacked pine boards, then scraping, and sanding once to obtain the pine front core.
Compared with the embodiment 5, the hot melt adhesive adopted by the embodiment has higher content of formaldehyde in the adopted hot melt adhesive component, so that the urea-formaldehyde resin has stronger stability, the formaldehyde occupation ratio is higher than that of urea, the urea-formaldehyde resin can be completely reacted into the urea-formaldehyde resin, but the formaldehyde residue exists, the formaldehyde release amount in the future is higher, and compared with the traditional cold glue gluing mode, the hot melt gluing has stronger smoothness and can not generate the external deformation.
Example eight
Referring to fig. 2, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a bevel sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 40% of formaldehyde, 30% of urea, 25% of melamine, 3% of caustic soda, 1% of polyvinyl alcohol and 1% of curing agent, and splicing more than one layer of pine board cores into a pine board after coating;
3) the assembled pine boards are stacked flatly in an environment with the temperature of 30 ℃ and the humidity of 60%, the pine boards are placed for 5-7 days, and the pine boards are stacked flatly until the water content of the pine boards is 12%;
4) coating a layer of atomic ash on the surface of the stacked pine board, then leveling, sanding for the first time, repeatedly coating a layer of atomic ash on the pine board which is sanded for the first time, leveling, sanding for the second time, leveling, repeatedly coating a layer of atomic ash on the pine board which is sanded for the second time, leveling, sanding for the third time, and leveling to obtain the front pine core.
Compared with the embodiment 7, the embodiment adopts the process of sanding for three times, so that when the wood veneer is subsequently used for the veneer, the bonding effect of the surface of the pine board and the veneer is better, and the condition of external deformation is not easy to occur during pressing.
Example nine
Referring to fig. 3, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a symmetrical oblique sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 30% of formaldehyde, 40% of urea, 25% of melamine, 1% of caustic soda, 1% of polyvinyl alcohol and 3% of curing agent, and splicing more than one layer of pine board cores into a pine board after coating;
3) the assembled pinewood boards are stacked flatly at the temperature of 25 ℃ and the humidity of 60%, the pinewood boards are placed for 5-7 days, and the pinewood boards are stacked flatly until the water content of the pinewood boards is 8%;
4) and coating a layer of putty on the surface of the stacked pine boards, then scraping, and sanding once to obtain the pine front core.
Compared with the embodiment 1, the split surface of the pine plate core is processed in a symmetrical oblique sawtooth shape, the middle of the split surface is designed into two oblique sawteeth, the processing mode is more complex, but the joint stability of the split surface is higher, and micro offset is not easy to occur in the lateral direction, the vertical direction and the oblique direction.
Example ten
Referring to fig. 3, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a symmetrical oblique sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 35% of formaldehyde, 35% of urea, 25% of melamine, 1% of caustic soda, 3% of polyvinyl alcohol and 1% of curing agent, and splicing more than one layer of pine board cores into a pine board after coating;
3) the assembled pine boards are stacked flatly at the temperature of 30 ℃ and the humidity of 65%, and are placed for 5-7 days until the moisture content of the pine boards is 12%;
4) and coating a layer of putty on the surface of the stacked pine boards, then scraping, and sanding once to obtain the pine front core.
Compared with the embodiment 9, the proportion of formaldehyde and urea in the adopted hot melt adhesive component is the same, and the hot melt adhesive can fully react to form urea-formaldehyde resin, so that the urea-formaldehyde resin has stronger stability, no formaldehyde residue or only a little formaldehyde residue, and lower formaldehyde release amount in the future.
EXAMPLE eleven
Referring to fig. 3, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a symmetrical oblique sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 40% of formaldehyde, 35% of urea, 20% of melamine, 1% of caustic soda, 3% of polyvinyl alcohol and 1% of curing agent, and splicing more than one layer of pine board cores into a pine board after coating;
3) the assembled pine boards are stacked flatly at the temperature of 30 ℃ and the humidity of 65%, and are placed for 5-7 days until the moisture content of the pine boards is 12%;
4) and coating a layer of putty on the surface of the stacked pine boards, then scraping, and sanding once to obtain the pine front core.
Compared with the embodiment 9, the proportion of formaldehyde in the adopted hot melt adhesive is higher than that of urea, the urea-formaldehyde resin can be completely reacted, the stability of the urea-formaldehyde resin is stronger, formaldehyde residue exists, the later formaldehyde release amount is higher, and compared with the traditional cold glue gluing mode, the hot melt gluing mode has stronger smoothness and can not generate the external deformation.
Example twelve
Referring to fig. 3, a process for preparing a pine wood front core includes the following steps:
1) processing the splicing surface of the pine board core into a symmetrical oblique sawtooth shape;
2) coating a hot melt adhesive on the splicing surface of the pine board core, wherein the coated hot melt adhesive is prepared from the following raw materials in percentage by weight: 40% of formaldehyde, 30% of urea, 25% of melamine, 3% of caustic soda, 1% of polyvinyl alcohol and 1% of curing agent, and splicing more than one layer of pine board cores into a pine board after coating;
3) the assembled pine boards are stacked flatly in an environment with the temperature of 30 ℃ and the humidity of 60%, the pine boards are placed for 5-7 days, and the pine boards are stacked flatly until the water content of the pine boards is 12%;
4) coating a layer of atomic ash on the surface of the stacked pine board, then leveling, sanding for the first time, repeatedly coating a layer of atomic ash on the pine board which is sanded for the first time, leveling, sanding for the second time, leveling, repeatedly coating a layer of atomic ash on the pine board which is sanded for the second time, leveling, sanding for the third time, and leveling to obtain the front pine core.
Compared with the embodiment 11, the embodiment adopts the process of sanding for three times, so that when the wood veneer is subsequently used for the veneer, the bonding effect of the surface of the pine board and the veneer is better, and the condition of external deformation is not easy to occur during pressing.
The effect of the pine wood front core provided by the embodiment of the invention on the subsequent veneer processing is explained in the following with reference to the first to the twelfth embodiments.
Experimental example 1
The first, fifth and ninth embodiments of the pine wood front core adopting different splicing surfaces are used as a first experimental group, a fifth experimental group and a ninth experimental group, and the pine wood front core adopting the splicing surface as a plane is used as a first comparison group under the condition of the same other processes.
Specifically, the comparison method of pine wood anterior core is as follows:
selecting 100 pieces of pine front cores produced by the experiment group I, the experiment group five and the experiment group nine and 100 pieces of pine front cores produced by the comparison group I, uniformly processing the pine front cores into veneers by adopting the conventional procedures, and comparing the yields of the veneers, wherein the specific test results are as follows:
TABLE 1 influence of bonding surface on yield
From the above comparison, it can be seen that: the yield of the pine front core obtained in the steps 2-4 in the scheme is higher than that of 30-40% in the prior art, and the yield of the pine front core obtained by adopting the serrated surface can be obviously improved in subsequent processing operation, particularly the veneer produced by the experimental group nine has the most complex working procedures, but the yield is the highest.
Experimental example two
The first, second and third embodiments of the pine front core adopting different proportions are taken as a first, second and third experimental groups, and the pine front core adopting the split surface coated with the cold glue is taken as a second comparative group under the condition of the same other processes.
Specifically, the comparison method of pine wood anterior core is as follows:
selecting 100 pieces of pine front cores produced by the experiment group I, the experiment group II and the experiment group III and 100 pieces of pine front cores produced by the comparison group II, uniformly processing the pine front cores into veneers by adopting the conventional procedures, and comparing the yield of the veneers, wherein the specific test results are as follows:
TABLE 2 influence of plate alignment adhesive on yield
From the above comparison, it can be seen that: the yield of the pine front core obtained by the steps 1, 3 and 4 in the scheme is higher than that of the pine front core obtained by the prior art by 30-40%, and compared with the pine front core obtained by cold glue, the yield of the pine front core obtained by the hot melt glue is obviously improved in subsequent processing operation.
In addition, three veneers are selected by adopting a sampling inspection mode aiming at the veneers produced by the experimental groups I to III, the formaldehyde emission of the veneers is detected by a 40L dryer in GB18584-2001, and the test results are as follows:
TABLE 3 Formaldehyde emission
From the above comparison, it can be seen that: in the first to third experimental groups, the formaldehyde emission amount of the first experimental group is the lowest, and the yield is the lowest, while the yield of the second experimental group is similar to that of the third experimental group, and the formaldehyde emission amount is obviously lower than that of the third experimental group, and the yield of the third experimental group is the highest, but the formaldehyde emission amount is also the highest.
Experimental example III
The third embodiment and the fourth embodiment, the seventh embodiment and the eighth embodiment, and the eleventh embodiment and the twelfth embodiment of the pine front core adopting different polishing times are taken as experimental groups three, four, seven, eight, eleven and twelve.
Specifically, the comparison method of pine wood anterior core is as follows:
selecting 100 pine front cores produced in the processes of experiment groups I, IV, VII, VIII, IV and twelve, uniformly processing the pine front cores into veneers by adopting the conventional procedures, and comparing the yield of the veneers, wherein the specific test results are as follows:
TABLE 4 influence of polishing frequency on yield
From the above comparison, it can be seen that: under the condition of other process equivalence, the more polishing times, the higher the yield, but the equivalent, the cost can be obviously improved.
The invention has the beneficial effects that:
the joint surfaces of the two-by-two spliced pine board cores are more firmly jointed through the splicing structure of the sawtooth surfaces, the front core of the veneer is pretreated to avoid the situation of splitting and deformation in the subsequent processing process, the hot melt adhesive is matched for jointing, the veneer is flatly stacked to be firmly adhered, the outer surface is coated with putty for sanding, the front core of the veneer is pretreated, the high-temperature laminated board can not be split by adopting the hot-splicing glue, the flatly stacked board is used for solving the deformation situation of the board, the surface of the board can be flatly repaired and sanded by surface repair and sanding, so that the qualified standard can be reached in the subsequent melamine laminating operation, the pine board core in the board can keep good joint degree and ensure the smoothness of the surface of the board in the subsequent processing process of laminating wood veneers and pressing, the conditions such as external deformation are not easy to occur, thereby achieving the effect of improving the yield.
The above-described embodiments of the present invention are not intended to limit the scope of the present invention, and the embodiments of the present invention are not limited thereto, and various other modifications, substitutions and alterations can be made to the above-described structure of the present invention without departing from the basic technical concept of the present invention as described above, according to the common technical knowledge and conventional means in the field of the present invention.
Claims (9)
1. A preparation process of a pine front core is characterized by comprising the following steps:
1) processing the splicing surface of the pine board core into a sawtooth shape;
2) coating hot melt adhesive on the splicing surfaces of the pine board cores, and splicing more than one layer of pine board cores into a pine board in pairs after coating;
3) the assembled pine boards are stacked flatly in an environment with the temperature of 25-30 ℃ and the humidity of 60-70%, and are placed for 5-7 days;
4) and coating a layer of putty on the surface of the stacked pine boards, then scraping, and sanding once to obtain the pine front core.
2. The process for preparing a pine wood front core according to claim 1, wherein: in the step 2), the coated hot melt adhesive consists of the following raw materials in percentage by weight: 30-40% of formaldehyde, 30-40% of urea, 20-30% of melamine, 1-5% of caustic soda, 1-5% of polyvinyl alcohol and 1-5% of curing agent.
3. The process for preparing a pine wood front core according to claim 2, wherein: in the step 2), the coated hot melt adhesive consists of the following raw materials in percentage by weight: 30% of formaldehyde, 40% of urea, 25% of melamine, 1% of caustic soda, 1% of polyvinyl alcohol and 3% of curing agent.
4. The process for preparing a pine wood front core according to claim 2, wherein: in the step 2), the coated hot melt adhesive consists of the following raw materials in percentage by weight: 40% of formaldehyde, 35% of urea, 20% of melamine, 3% of caustic soda, 1% of polyvinyl alcohol and 1% of curing agent.
5. The process for preparing a pine wood front core according to claim 2, wherein: in the step 2), the coated hot melt adhesive consists of the following raw materials in percentage by weight: 36% of formaldehyde, 35% of urea, 24% of melamine, 1% of caustic soda, 3% of polyvinyl alcohol and 1% of curing agent.
6. A process for the preparation of a pine wood forecore according to any one of claims 1 to 4, wherein: in the step 3), the moisture content of the flatly stacked pine boards is 6-12%.
7. A process for the preparation of a pine wood forecore according to any one of claims 1 to 4, wherein: in the step 4), the pine board subjected to primary sanding is repeatedly coated with a layer of putty, then is strickled off, and is subjected to secondary sanding.
8. The process for preparing a pine wood front core according to any one of claim 7, wherein: in the step 4), the pine board subjected to secondary sanding is repeatedly coated with a layer of putty, then is strickled off, and is sanded for three times.
9. Use of a pine front core according to claims 1-8 in a veneer.
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