CN114523778B - Continuous printing process for wood veneer intaglio plate - Google Patents
Continuous printing process for wood veneer intaglio plate Download PDFInfo
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- CN114523778B CN114523778B CN202111643985.6A CN202111643985A CN114523778B CN 114523778 B CN114523778 B CN 114523778B CN 202111643985 A CN202111643985 A CN 202111643985A CN 114523778 B CN114523778 B CN 114523778B
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- 238000007639 printing Methods 0.000 title claims abstract description 136
- 239000002023 wood Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000003973 paint Substances 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 28
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 26
- 239000000853 adhesive Substances 0.000 claims abstract description 24
- 230000001070 adhesive effect Effects 0.000 claims abstract description 24
- 239000011248 coating agent Substances 0.000 claims abstract description 22
- 238000000576 coating method Methods 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 22
- 238000005520 cutting process Methods 0.000 claims abstract description 16
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 238000007761 roller coating Methods 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 230000001680 brushing effect Effects 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000003892 spreading Methods 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- 229920001971 elastomer Polymers 0.000 claims description 25
- 238000010020 roller printing Methods 0.000 claims description 20
- 239000003292 glue Substances 0.000 claims description 19
- 238000001723 curing Methods 0.000 claims description 16
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 13
- 238000003848 UV Light-Curing Methods 0.000 claims description 10
- 239000003607 modifier Substances 0.000 claims description 10
- LUEWUZLMQUOBSB-FSKGGBMCSA-N (2s,3s,4s,5s,6r)-2-[(2r,3s,4r,5r,6s)-6-[(2r,3s,4r,5s,6s)-4,5-dihydroxy-2-(hydroxymethyl)-6-[(2r,4r,5s,6r)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol Chemical compound O[C@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@@H](O[C@@H]2[C@H](O[C@@H](OC3[C@H](O[C@@H](O)[C@@H](O)[C@H]3O)CO)[C@@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O LUEWUZLMQUOBSB-FSKGGBMCSA-N 0.000 claims description 6
- 229920002581 Glucomannan Polymers 0.000 claims description 6
- 229920002752 Konjac Polymers 0.000 claims description 6
- 229940046240 glucomannan Drugs 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 235000010485 konjac Nutrition 0.000 claims description 6
- 229920002907 Guar gum Polymers 0.000 claims description 5
- 108010073771 Soybean Proteins Proteins 0.000 claims description 5
- 229920002472 Starch Polymers 0.000 claims description 5
- 229960004106 citric acid Drugs 0.000 claims description 5
- 235000015165 citric acid Nutrition 0.000 claims description 5
- 239000000665 guar gum Substances 0.000 claims description 5
- 229960002154 guar gum Drugs 0.000 claims description 5
- 235000010417 guar gum Nutrition 0.000 claims description 5
- 238000005286 illumination Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 229940071440 soy protein isolate Drugs 0.000 claims description 5
- 235000019710 soybean protein Nutrition 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 229940032147 starch Drugs 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 description 8
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 238000004826 seaming Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 238000007646 gravure printing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000000973 cosmetic coloring agent Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
- B41M1/38—Printing on other surfaces than ordinary paper on wooden surfaces, leather, or linoleum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/10—Intaglio printing ; Gravure printing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0045—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by mechanical wave energy, e.g. ultrasonics, cured by electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams, or cured by magnetic or electric fields, e.g. electric discharge, plasma
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Wood Science & Technology (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Toxicology (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
- Finished Plywoods (AREA)
Abstract
The invention provides a continuous printing process of a veneer intaglio plate, which comprises the steps of raw material preparation, veneer cutting, veneer edge joint, veneer printing pre-preparation, veneer printing and finish paint roller coating; the veneer edge joint comprises the following steps: the method comprises the steps of (1) adopting a seam splicing machine to carry out wood skin seam splicing, spreading non-woven fabrics on a seam splicing table board of the seam splicing machine, and brushing adhesive on the surface of the non-woven fabrics; splicing the cut wood Pi Jincou on one side of the non-woven fabric brushed with the adhesive; after the wood Pi Jincou is spliced, drying by hot air, and rolling for standby to obtain wood Pi Juancai; the veneer is printed: placing wood Pi Juancai in a printer for printing; the veneer coiled material sequentially passes through a first group of printing rollers, a second group of printing rollers, a third group of printing rollers and a fourth group of printing rollers for printing; and (5) rolling after printing. The process realizes continuous jet printing of the veneer facing material, has high production efficiency, and can realize special-shaped coating.
Description
Technical Field
The invention relates to a veneer printing process, in particular to a veneer intaglio continuous printing process, and belongs to the technical field of furniture decoration material processing.
Background
Modern panel furniture facing materials are numerous, including veneer, decals, and the like. The veneer facing furniture has natural texture, beautiful appearance and durability. The preparation method of the veneer-faced furniture comprises the steps of splicing and adhering veneer on the surface of a furniture plate, and then carrying out spray printing or cosmetic coloring on the surface of the veneer; obtaining a veneer facing board printed with a specific pattern; and then processing into various veneer facing furniture according to the requirements.
Because the veneer itself has the characteristics of easy fragmentation and difficult curling, the veneer facing plate is manufactured by sticking the veneer on the plate at present and then spray printing or cosmetic coloring. The spray printing of the veneer facing plate can only be performed on one plate and one plate in sequence; the continuous jet printing cannot be performed, the processing efficiency is low, the application of the processed plate is limited, only plane coating can be performed, and abnormal coating cannot be performed.
In conclusion, the method comprises the steps of,how to realize continuous jet printing of veneer facing materials is a technical problem to be solved in the industry.Meanwhile, the technical problems of low production efficiency and incapability of special-shaped coating are also faced.
Disclosure of Invention
Aiming at the technical problems, the invention provides a continuous printing process for wood veneer intaglio, which realizes the aim of continuous jet printing of wood veneer facing materials, improves the production efficiency and solves the technical problem that abnormal coating cannot be realized.
The invention adopts the following technical scheme:
a continuous printing process of veneer intaglio, comprising the following steps:
step 1, raw material preparation
The purchased wood Pi Jicai was kept in the following environment: direct sunlight is avoided; good ventilation is maintained; the temperature is 10-30 ℃ and the humidity is 20-60 percent for standby.
Step 2, cutting wood Pi Cai
The wood Pi Jicai is stacked neatly, the wood veneer is cut by a sharp cutter of a fine cutting machine, the stacking thickness of the once cut wood Pi Jicai is not more than 30mm, the wood veneer is prevented from being stacked and cut too thickly to cause wedge-shaped, and the tightness of the wood veneer edge joint is affected. When cutting edges, the cutter cuts the surface of the veneer perpendicularly, so that the veneer after cutting edges is regular in shape and flat in edge. And when the joint is ensured, the wood veneers are compactly spliced.
The moisture content of the wood Pi Jicai is 6-9% (mass percent).
Step 3, veneer edge joint
And (3) carrying out wood skin edge joint by adopting an edge joint machine, spreading the non-woven fabric on an edge joint table board of the edge joint machine, and brushing adhesive on the surface of the non-woven fabric. Splicing the cut wood Pi Jincou on one side of the non-woven fabric brushed with adhesive, controlling the air pressure of a heating plate of a seaming machine to be 1-2bar, controlling the air pressure of a conveying belt to be 0.1-0.2bar, controlling the air pressure of a feeding wheel to be 1.0-2.0bar, heating the adhesive to 180 ℃, ensuring the adhesive line to be melted fully, and increasing the strength of the veneer seams and the splicing strength of the veneer.
The non-woven fabric is: polyester nonwoven fabric having a gram weight of 5 g/square meter and a thickness of 0.15 mm.
The adhesive glue: the jigsaw glue and the flexible modifier are prepared according to the following weight percentage of 7-8:2-3 by mass ratio. The plate splicing glue comprises: 55+/-1% of solid content, 6-7 of pH value, 12000-15000cps (25 ℃), and main agent: curing agent = 100:10-11 (mass ratio). The main agent comprises the components of soy protein isolate, starch, citric acid and guar gum in a mass ratio of 8-8.5:1-2:0.3-0.5:0.8-1.2. The soybean protein isolate: the protein content is 90-92%. The curing agent is polyurethane curing agent. The flexibility modifier: is a mixture of konjak glucomannan and glycerol according to the mass ratio of 7:1-3.
After the wood Pi Jincou is spliced, the wood is dried by hot air and rolled for standby, and the wood Pi Juancai is obtained, and the diameter of the veneer roll is 500mm. The hot air is dried: the temperature of the hot air is 70-80 ℃.
The resulting wood Pi Juancai: the tensile strength is more than or equal to 18Mpa, the elongation at break (transverse) is more than or equal to 130%, the elongation at break (longitudinal) is more than or equal to 130%, and the dimensional change rate is less than or equal to 7%; the thickness is 0.35+/-3 mm, the water absorption is 55+/-3 s, the moisture content is 3-4%, and the smoothness is 90-93s.
Step 4, preparation before veneer printing
Preparing a printing machine, wherein the whole printing machine is provided with an air compression tank, the total air quantity is 12kg, and the air pressure of the air compression tank is set to be 12 kg/cm; the printing machine has 4 groups of plate rollers to participate in printing, and each group of plate rollers is provided with an air cylinder, and the air quantity is 6kg. And cleaning the printing plate roller in an ultrasonic plate roller cleaning machine for 20min, and mounting the cleaned printing plate roller on a printing machine for printing.
After stirring the ink at high speed for 20min, the viscosity of the ink is 50-60S, and the ink is added into a printing machine table for printing. The method for measuring the viscosity of the ink is measured according to the GB/T1723-93 method.
Step 5, veneer printing
The wood Pi Juancai was placed in a printer for printing. The veneer coiled material sequentially passes through a first group of printing rollers, a second group of printing rollers, a third group of printing rollers and a fourth group of printing rollers for printing; and (5) rolling after printing.
The first set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 35HS, the contact angle alpha is 35 degrees, the printing speed is 80-85m/min, the drying temperature is 70 ℃, and the air quantity is 55 m/h.
The second set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 35HS, the contact angle alpha is 35 degrees, the printing speed is 80-85m/min, the drying temperature is 90 ℃, and the air quantity is 55 m/h.
The third set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 45HS, the contact angle alpha is 45 degrees, the printing speed is 80-85m/min, the drying temperature is 80 ℃, and the air quantity is 55 m/h.
The fourth set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 45HS, the contact angle alpha is 45 degrees, the printing speed is 80-85m/min, the drying temperature is 120 ℃, and the air quantity is 55 m/h.
Step 6, roller coating of the finishing paint
Coating the printed veneer roll with finishing paint, and forming a flexible resin layer on the surface to obtain the veneer facing material. The coating finish paint adopts roller coating, the pressure of a cylinder is controlled to be 4kg during coating, the hardness of a rubber roller is 45HS, the contact angle alpha is 45 degrees, the running speed is 80-85m/min, a UV curing lamp is started to cure in the running process, the power of the UV curing lamp is 8kw, the ultraviolet wavelength is 300nm-400nm, and the illumination intensity is more than 4mW/cm 2 。
The coating weight of the finish paint is 15 g/square meter. The top coat is flexible UV resin.
The technical scheme of the invention has the beneficial effects that:
(1) the continuous printing process for the veneer intaglio realizes continuous printing treatment of the veneer, improves the production efficiency, can print 5500-6000 square meters of veneer facing material per hour, and saves the cost.
(2) According to the continuous printing process of the veneer intaglio, the veneer facing material of the prepared product is strong in flexibility and is not broken after being bent for 90 degrees; the application environment is not limited to flat paste, and R angle cladding can be realized; can be used for surface decoration of different materials such as density boards, shaving boards, glass magnesium boards, cement boards and the like.
(3) According to the continuous printing process of the veneer intaglio, the surface gloss of the veneer facing material of the prepared product is uniform, and the glossiness deviation is +/-5 degrees; the finish paint has good adhesive force, high paint film hardness, strong wear resistance, good corrosion resistance and weather resistance, cold and heat change resistance and alcohol corrosion resistance.
Detailed Description
Example 1 continuous gravure printing Process for Wood veneer
The method comprises the following steps:
step 1, raw material preparation
The purchased wood Pi Jicai was kept in the following environment: direct sunlight is avoided; good ventilation is maintained; the temperature is 10 ℃ and the humidity is 20%; and (5) standby.
Step 2, cutting wood Pi Cai
The wood Pi Jicai is stacked neatly, the wood veneer is cut by a sharp cutter of a fine cutting machine, and the stacked thickness of the once cut wood Pi Jicai is 30mm, so that the wood veneer is prevented from being stacked too thick and cut to cause wedge-shaped, and the tightness of the wood veneer edge joint is affected. When cutting edges, the cutter cuts the surface of the veneer perpendicularly, so that the veneer after cutting edges is regular in shape and flat in edge. And when the joint is ensured, the wood veneers are compactly spliced.
The moisture content of the wood Pi Jicai was 6% (mass percent).
Step 3, veneer edge joint
And (3) carrying out wood skin edge joint by adopting an edge joint machine, spreading the non-woven fabric on an edge joint table board of the edge joint machine, and brushing adhesive on the surface of the non-woven fabric. The cut wood Pi Jincou is spliced on one side of the non-woven fabric brushed with adhesive, the air pressure of a heating plate of a seaming machine is controlled at 1bar, the air pressure of a conveying belt is controlled at 0.1bar, the air pressure of a feeding wheel is controlled at 1.0bar, the temperature of the adhesive is raised to 180 ℃, the glue line is ensured to be fully melted, and the strength of a veneer seam and the splicing strength of veneers are increased.
The non-woven fabric is: polyester nonwoven fabric having a gram weight of 5 g/square meter and a thickness of 0.15 mm.
The adhesive glue: the jigsaw glue and the flexible modifier are prepared according to the following steps: 2 mass ratio. The plate splicing glue comprises: 55% of solid content, 6 of pH value, 12000cps (25 ℃), main agent: curing agent = 100:10 (mass ratio). The main agent comprises the components of soy protein isolate, starch, citric acid and guar gum in a mass ratio of 8:1.5:0.4:0.1. the soybean protein isolate: the protein content was 90%. The curing agent is polyurethane curing agent, and the model is kesi N100. The flexibility modifier: is a mixture of konjak glucomannan and glycerol according to a mass ratio of 7:2.
After the wood Pi Jincou is spliced, the wood is dried by hot air and rolled for standby, and the wood Pi Juancai is obtained, and the diameter of the veneer roll is 500mm. The hot air is dried: the hot air temperature was 70 ℃.
The resulting wood Pi Juancai: tensile strength 18Mpa, elongation at break (transverse direction) 130%, elongation at break (longitudinal direction) 150% and dimensional change 7%; the thickness was 0.35mm, the water absorption was 55s, the moisture content was 3%, and the smoothness was 90s.
Step 4, preparation before veneer printing
Preparing a printing machine, wherein the whole printing machine is provided with an air compression tank, the total air quantity is 12kg, and the air pressure of the air compression tank is set to be 12 kg/cm; the printing machine has 4 groups of plate rollers to participate in printing, and each group of plate rollers is provided with an air cylinder, and the air quantity is 6kg. And cleaning the printing plate roller in an ultrasonic plate roller cleaning machine for 20min, and mounting the cleaned printing plate roller on a printing machine for printing.
After stirring the ink at high speed for 20min, the viscosity of the ink is 50S, and the ink is added into a printing machine table to prepare printing.
Step 5, veneer printing
The wood Pi Juancai was placed in a printer for printing. The veneer coiled material sequentially passes through a first group of printing rollers, a second group of printing rollers, a third group of printing rollers and a fourth group of printing rollers for printing; and (5) rolling after printing.
The first set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 35HS, the contact angle alpha is 35 degrees, the printing speed is 80m/min, the drying temperature is 70 ℃, and the air quantity is 55 m/h.
The second set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 35HS, the contact angle alpha is 35 degrees, the printing speed is 80m/min, the drying temperature is 90 ℃, and the air quantity is 55 m/h.
The third set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 45HS, the contact angle alpha is 45 degrees, the printing speed is 80m/min, the drying temperature is 80 ℃, and the air quantity is 55 m/h.
The fourth set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 45HS, the contact angle alpha is 45 degrees, the printing speed is 80m/min, the drying temperature is 120 ℃, and the air quantity is 55 m/h.
Step 6, roller coating of the finishing paint
Rolling the printed veneerCoating finish paint, and forming a flexible resin layer on the surface to obtain the wood veneer facing material. The coating finish paint adopts roller coating, the pressure of a cylinder is controlled to be 4kg during coating, the hardness of a rubber roller is 45HS, the contact angle alpha is 45 degrees, the running speed is 80m/min, a UV curing lamp is started to cure in the running process, the power of the UV curing lamp is 8kw, the ultraviolet wavelength is 300nm, and the illumination intensity is 4mW/cm 2 。
The coating weight of the finish paint is 15 g/square meter. The finish paint is flexible UV resin and is Bayer UV resin 2491.
Example 2 continuous gravure printing Process of Wood veneer
The method comprises the following steps:
step 1, raw material preparation
The purchased wood Pi Jicai was kept in the following environment: direct sunlight is avoided; good ventilation is maintained; the temperature is 20 ℃ and the humidity is 45%.
Step 2, cutting wood Pi Cai
The wood Pi Duidie is tidy, the wood veneer is cut by a sharp cutter of a finishing cutter, the thickness of the cut wood Pi Duidie is 30mm, and the phenomenon that the wood veneer is stacked too thick to cut to cause wedge-shaped is prevented, so that the tightness of the wood veneer edge joint is affected. When cutting edges, the cutter cuts the surface of the veneer perpendicularly, so that the veneer after cutting edges is regular in shape and flat in edge. And when the joint is ensured, the wood veneers are compactly spliced.
The moisture content of the wood Pi Jicai was 7% (mass percent).
Step 3, veneer edge joint
And (3) carrying out wood skin edge joint by adopting an edge joint machine, spreading the non-woven fabric on an edge joint table board of the edge joint machine, and brushing adhesive on the surface of the non-woven fabric. The cut wood Pi Jincou is spliced on one side of the non-woven fabric brushed with adhesive, the air pressure of a heating plate of a seaming machine is controlled at 1.5bar, the air pressure of a conveying belt is controlled at 0.15bar, the air pressure of a feeding wheel is controlled at 1.5bar, the temperature of the adhesive is raised to 180 ℃, the glue line is ensured to be fully melted, and the strength of the veneer seams and the splicing strength of the veneer are increased.
The non-woven fabric is: polyester nonwoven fabric having a gram weight of 5 g/square meter and a thickness of 0.15 mm.
The adhesive glue: the jigsaw glue and the flexible modifier are prepared according to the following steps: 3 mass ratio. The plate splicing glue comprises: 56% of solid content, 7 of pH value, 14000cps (25 ℃), main agent: curing agent = 100:10 (mass ratio). The main agent comprises the components of soy protein isolate, starch, citric acid and guar gum in a mass ratio of 8:1.7:0.5:0.1. the soybean protein isolate: the protein content was 91%. The curing agent is polyurethane curing agent, and the model is kesi N100. The flexibility modifier: is a mixture of konjak glucomannan and glycerol according to a mass ratio of 7:1.8.
After the wood Pi Jincou is spliced, the wood is dried by hot air and rolled for standby, and the wood Pi Juancai is obtained, and the diameter of the veneer roll is 500mm. The hot air is dried: the hot air temperature was 75 ℃.
The resulting wood Pi Juancai: tensile strength 20MPa, elongation at break (transverse direction) 140%, elongation at break (longitudinal direction) 160% and dimensional change 4%; thickness 0.33mm, water absorption 52s, moisture content 3%, smoothness 90s.
Step 4, preparation before veneer printing
Preparing a printing machine, wherein the whole printing machine is provided with an air compression tank, the total air quantity is 12kg, and the air pressure of the air compression tank is set to be 12 kg/cm; the printing machine has 4 groups of plate rollers to participate in printing, and each group of plate rollers is provided with an air cylinder, and the air quantity is 6kg. And cleaning the printing plate roller in an ultrasonic plate roller cleaning machine for 20min, and mounting the cleaned printing plate roller on a printing machine for printing.
After the ink is stirred at a high speed for 20min, the viscosity of the ink is 55S, and the ink is added into a printing machine table for printing.
Step 5, veneer printing
The wood Pi Juancai was placed in a printer for printing. The veneer coiled material sequentially passes through a first group of printing rollers, a second group of printing rollers, a third group of printing rollers and a fourth group of printing rollers for printing; and (5) rolling after printing.
The first set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 35HS, the contact angle alpha is 35 degrees, the printing speed is 83m/min, the drying temperature is 70 ℃, and the air quantity is 55 m/h.
The second set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 35HS, the contact angle alpha is 35 degrees, the printing speed is 83m/min, the drying temperature is 90 ℃, and the air quantity is 55 m/h.
The third set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 45HS, the contact angle alpha is 45 degrees, the printing speed is 83m/min, the drying temperature is 80 ℃, and the air quantity is 55 m/h.
The fourth set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 45HS, the contact angle alpha is 45 degrees, the printing speed is 83m/min, the drying temperature is 120 ℃, and the air quantity is 55 m/h.
Step 6, roller coating of the finishing paint
Coating the printed veneer roll with finishing paint, and forming a flexible resin layer on the surface to obtain the veneer facing material. The coating finish paint adopts roller coating, the pressure of a cylinder is controlled to be 4kg during coating, the hardness of a rubber roller is 45HS, the contact angle alpha is 45 degrees, the running speed is 83m/min, a UV curing lamp is started for curing in the running process, the power of the UV curing lamp is 8kw, the wavelength of ultraviolet is 350nm, and the illumination intensity is 4.5mW/cm 2 。
The coating weight of the finish paint is 15 g/square meter. The finish paint is flexible UV resin and is Bayer UV resin 2491.
Example 3 continuous gravure printing Process of Wood veneer
The method comprises the following steps:
step 1, raw material preparation
The purchased wood Pi Jicai was kept in the following environment: direct sunlight is avoided; good ventilation is maintained; the temperature is 30 ℃ and the humidity is 60 percent.
Step 2, cutting wood Pi Cai
The wood Pi Duidie is tidy, the wood veneer is cut by a sharp cutter of a finishing cutter, the thickness of the cut wood Pi Duidie is 30mm, and the phenomenon that the wood veneer is stacked too thick to cut to cause wedge-shaped is prevented, so that the tightness of the wood veneer edge joint is affected. When cutting edges, the cutter cuts the surface of the veneer perpendicularly, so that the veneer after cutting edges is regular in shape and flat in edge. And when the joint is ensured, the wood veneers are compactly spliced. The moisture content of the wood Pi Jicai was 9% (mass percent).
Step 3, veneer edge joint
And (3) carrying out wood skin edge joint by adopting an edge joint machine, spreading the non-woven fabric on an edge joint table board of the edge joint machine, and brushing adhesive on the surface of the non-woven fabric. The cut wood Pi Jincou is spliced on one side of the non-woven fabric brushed with adhesive, the air pressure of a heating plate of a seaming machine is controlled at 2bar, the air pressure of a conveying belt is controlled at 0.2bar, the air pressure of a feeding wheel is controlled at 2.0bar, the temperature of the adhesive is raised to 180 ℃, the glue line is ensured to be fully melted, and the strength of a veneer seam and the splicing strength of veneers are increased.
The non-woven fabric is: polyester nonwoven fabric having a gram weight of 5 g/square meter and a thickness of 0.15 mm.
The adhesive glue: the jigsaw glue and the flexible modifier are prepared according to the following weight ratio of 8:3 mass ratio. The plate splicing glue comprises: 54% of solid content, 6.5 of pH value, 15000cps (25 ℃), main agent: curing agent = 100:10 (mass ratio). The main agent comprises the components of soy protein isolate, starch, citric acid and guar gum in a mass ratio of 8:1.3:0.3:0.2. the soybean protein isolate: the protein content was 92%. The curing agent is polyurethane curing agent, and the model is kesi N100. The flexibility modifier: is a mixture of konjak glucomannan and glycerol according to a mass ratio of 7:2.
After the wood Pi Jincou is spliced, the wood is dried by hot air and rolled for standby, and the wood Pi Juancai is obtained, and the diameter of the veneer roll is 500mm. The hot air is dried: the hot air temperature was 80 ℃.
The resulting wood Pi Juancai: tensile strength 25MPa, elongation at break (transverse direction) 150%, elongation at break (longitudinal direction) 170% and dimensional change 3%; thickness 0.38mm, water absorption 57s, moisture content 3%, smoothness 92s.
Step 4, preparation before veneer printing
Preparing a printing machine, wherein the whole printing machine is provided with an air compression tank, the total air quantity is 12kg, and the air pressure of the air compression tank is set to be 12 kg/cm; the printing machine has 4 groups of plate rollers to participate in printing, and each group of plate rollers is provided with an air cylinder, and the air quantity is 6kg. And cleaning the printing plate roller in an ultrasonic plate roller cleaning machine for 20min, and mounting the cleaned printing plate roller on a printing machine for printing.
After the ink is stirred at a high speed for 20min, the viscosity of the ink is 60S, and the ink is added into a printing machine table for printing.
Step 5, veneer printing
The wood Pi Juancai was placed in a printer for printing. The veneer coiled material sequentially passes through a first group of printing rollers, a second group of printing rollers, a third group of printing rollers and a fourth group of printing rollers for printing; and (5) rolling after printing.
The first set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 35HS, the contact angle alpha is 35 degrees, the printing speed is 85m/min, the drying temperature is 70 ℃, and the air quantity is 55 m/h.
The second set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 35HS, the contact angle alpha is 35 degrees, the printing speed is 85m/min, the drying temperature is 90 ℃, and the air quantity is 55 m/h.
The third set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 45HS, the contact angle alpha is 45 degrees, the printing speed is 85m/min, the drying temperature is 80 ℃, and the air quantity is 55 m/h.
The fourth set of plate roller printing: the cylinder pressure is 4kg, the rubber roller hardness is 45HS, the contact angle alpha is 45 degrees, the printing speed is 85m/min, the drying temperature is 120 ℃, and the air quantity is 55 m/h.
Step 6, roller coating of the finishing paint
Coating the printed veneer roll with finishing paint, and forming a flexible resin layer on the surface to obtain the veneer facing material. The coating finish paint adopts roller coating, the pressure of a cylinder is controlled to be 4kg during coating, the hardness of a rubber roller is 45HS, the contact angle alpha is 45 degrees, the running speed is 85m/min, a UV curing lamp is started to cure in the running process, the power of the UV curing lamp is 8kw, the ultraviolet wavelength is 400nm, and the illumination intensity is 4.2mW/cm 2 。
The coating weight of the finish paint is 15 g/square meter. The finish paint is flexible UV resin and is Bayer UV resin 2491.
Through testing, the veneer facing material printed by the process disclosed by the invention meets the following technical indexes:
surface gloss of veneer facing material: and (3) detecting by adopting a photometer, and obtaining the result: deviation + -5 deg..
Veneer finishing material finish paint adhesion: cross-hatch test, results: results: the falling rate is less than or equal to 5 percent.
Wood veneer finishing material film hardness: 2H pencil test, no scratch.
Wear resistance of veneer facing material: wiping with cotton cloth, applying force of 1kg/cm 2 Reciprocating for 500 times; results: the wiping point is not discolored and has no abrasion mark.
Corrosion resistance and weather resistance of veneer facing materials: salt spray test method, results: the corrosion resistance time is more than or equal to 24 hours.
Cold and hot circulation of veneer facing material: baking at 60 deg.C for 24 hr, freezing at-20 deg.C for 24 hr, and repeating for 3 cycles. Results: no bubble, no crack and no drop rate less than 10%.
The veneer facing material has alcohol resistance: soaking in pure alcohol for 24 hours, and obtaining the following result: the surface has no obvious change.
Except for specific descriptions, the proportions of the invention are mass percentages, the percentages are mass percentages, and the viscosity is measured according to the method of GB/T1723-93.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. A continuous printing process of wood veneer intaglio is characterized in that: the method comprises the steps of raw material preparation, veneer cutting, veneer edge joint, veneer pre-printing preparation, veneer printing and finish paint roller coating; the veneer edge joint comprises the following steps: the method comprises the steps of (1) adopting a seam splicing machine to carry out wood skin seam splicing, spreading non-woven fabrics on a seam splicing table board of the seam splicing machine, and brushing adhesive on the surface of the non-woven fabrics; splicing the cut wood Pi Jincou on one side of the non-woven fabric brushed with the adhesive; after the wood Pi Jincou is spliced, drying by hot air, and rolling for standby to obtain wood Pi Juancai; the veneer is printed: placing wood Pi Juancai in a printer for printing; the veneer coiled material sequentially passes through a first group of printing rollers, a second group of printing rollers, a third group of printing rollers and a fourth group of printing rollers for printing; rolling after printing;
the adhesive glue: the jigsaw glue and the flexible modifier are prepared according to the following weight percentage of 7-8:2-3 by mass ratio; the plate splicing glue comprises: the main agent comprises the following components: the curing agent is prepared from the following components in percentage by mass: 10-11, wherein the solid content is 55+ -1%, the PH value is 6-7, and the viscosity is 12000-15000cps (25 ℃);
the main agent comprises the components of soy protein isolate, starch, citric acid and guar gum in a mass ratio of 8-8.5:1-2:0.3-0.5:0.8-1.2; the soybean protein isolate: the protein content is 90-92%;
the curing agent is a polyurethane curing agent; the flexibility modifier: the konjak glucomannan is a mixture of konjak glucomannan and glycerol according to a mass ratio of 7:1-3;
the veneer edge joint comprises the following steps: the air pressure of a heating plate of the seam splicing machine is controlled to be 1-2bar, the air pressure of a conveying belt is controlled to be 0.1-0.2bar, the air pressure of a feeding wheel is controlled to be 1.0-2.0bar, and the temperature of adhesive glue is increased to 180 ℃;
the veneer is printed: the first set of plate roller printing: the cylinder pressure is 3-5kg, the rubber roller hardness is 34-36HS, the contact angle alpha is 34-36 degrees, the printing speed is 80-85m/min, the drying temperature is 65-75 ℃, and the air quantity is 54-56 m/h; the second set of plate roller printing: the cylinder pressure is 3-5kg, the rubber roller hardness is 34-36HS, the contact angle alpha is 34-36 degrees, the printing speed is 80-85m/min, the drying temperature is 85-95 ℃, and the air quantity is 50-60 m/h; the third set of plate roller printing: the cylinder pressure is 3-5kg, the rubber roller hardness is 44-46HS, the contact angle alpha is 44-46 degrees, the printing speed is 80-85m/min, the drying temperature is 75-85 ℃, and the air quantity is 50-60 m/h; the fourth set of plate roller printing: the cylinder pressure is 3-5kg, the rubber roller hardness is 44-46HS, the contact angle alpha is 44-46 degrees, the printing speed is 80-85m/min, the drying temperature is 115-125 ℃, and the air quantity is 50-60 m/h.
2. A continuous printing process for wood veneer intaglio according to claim 1 wherein: and (3) roller coating of the finishing paint: coating the printed veneer roll with finishing paint, and forming a flexible resin layer on the surface to obtain a veneer facing material of the product; the top coat is flexible UV resin.
3. A continuous printing process for wood veneer intaglio according to claim 1 wherein: and (3) roller coating of the finishing paint: the pressure of the cylinder is controlled to be 3.5-4.5kg during coating, the hardness of the rubber roller is 44-46HS, the contact angle alpha is 44-46 degrees, and the running speed is 80-85m/min.
4. A continuous printing process for wood veneer intaglio according to claim 1 wherein: and (3) roller coating of the finishing paint: the finish paint is coated and cured by starting a UV curing lamp, the power of the UV curing lamp is 8kw, the ultraviolet wavelength is 300nm-400nm, and the illumination intensity is more than 4mW/c square meter.
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