A kind of production equipment of curtain coating white-top kraft liner boardTechnical field
The invention belongs to pulp technology for making paper, be specifically related to a kind of curtain coating white-top kraft liner board production equipment and production method thereof.
Background technology
At present, the coated white-top kraft liner board on market, because its product has quantitatively lowly, intensity is high, surface ink absorbability and the good feature of print gloss, is deeply subject to numerous clients' welcome.Because the requirement of coated white-top kraft liner board effects on surface whiteness index and paper covering is higher, therefore, the coated white-top kraft liner board of previous generation substantially all will be through 2 times, or 3 times with after first-class multiple tracks coating, just can reach properties of product requirement.Meanwhile, for ensureing into paper appearance property and coating and printing effect, existing coating fine flour ox card is to be coated with on white-top kraft liner board substantially, and body paper whiteness, paper sophistication, paper impurity situation have all been proposed to very high requirement.And the raw material of production white-top kraft liner board, the basic bleached wood pulp that adopts of surface layer slurry, or the blank sheet of paper limit or the wastepaper that add after a part of deinking are starched, sandwich layer raw material adopts newspaper after deinking and the white slurry of magazine paper to carry out liner, could meet the requirement of coated white cardboard to coated base paper whiteness, paper sophistication.Meanwhile, as bodystock paper, the dust on its body paper surface, impurity content all can not be high, otherwise existing scraper, scraper coating technique can not effectively cover.
In prior art, coating fine flour ox card is to be generally coated with on fine flour ox card, and coating method adopts traditional scraper, or scraper coating.And coating combination is generally scraper+scraper, or the multi-layer coated combination of scraper+scraper.Due to scraper, or scraper coating is contact coating, in the time carrying out painting process, all needs, to coating blade, the certain pressure of scraper, paint used for coating to be covered on body paper uniformly, otherwise body paper can not be struck off.This coating method, coating layer thickness is thin, and covering is poor, and the Painting effect that reach often adopts multiple tracks coating, or higher coating weight.If whiteness is low, paper sophistication is poor, or the many body paper of paper impure point, as the boxboard of waste paper vermicelli, often can not effectively cover in the flaw on body paper, cannot produce qualified product.Therefore, existing coating fine flour ox card is often coated with on fine flour ox card, and, as the white-top kraft liner board of coating use, also paper sophistication, whiteness, impurity content are required very highly, otherwise can not produce qualified coated white-top kraft liner board.
Patent 201110117013 and patent 201110117025 have disclosed respectively production equipment for white surface coating kraft and production method, but it adopts twice shoe press and traditional curtain coating machine, and adopt curtain coating machine to carry out bottom coating, but it can not ensure the operation that the quality of guarantee painting paperboard in production keeps the high speed of a motor vehicle simultaneously.
Summary of the invention
Require high for existing coated white-top kraft liner board to bodystock paper, can only be at white slurry vermicelli, sandwich layer adopts deinked pulp to do the feature being coated with on the craft paper serving as a contrast, the present invention adopts Non-Contact Coating mode, gives full play to its Painting effect covering good, becomes paper whiteness high, the technical characterstic that ink absorption is splendid, on common craft paper, carry out high-speed coating, produce and meet market demands, qualified coated white-top kraft liner board.
One object of the present invention is to provide a kind of curtain coating white-top kraft liner board production equipment, and it comprises: comprise triple-lap wet end, press section, front baking cadre, size presser, post-drying portion, hard calender, coating machine and soft calendaring portion, reel machine that along continuous straight runs sets gradually.
Described coating machine comprises the curtain coating machine being coated with for the knife type coater of primary coat, for centre, and the knife type coater being coated with for face.
In one embodiment of the invention, on the spacer screen in described triple-lap wet end, be with top net, described press section is designed to three road squeezings, and a described pressure, two is pressed as shoe press, and three pressures adopt boots formula glazing press.Described size press adopts membrane type resin application methods.Described front baking cadre adopts 3 road list linked networks to arrange the two linked networks of drying cylinders and 4 roads and arranges drying cylinder, and described post-drying portion adopts 2 road list linked networks to arrange the two linked networks of drying cylinders and 1 road and arranges drying cylinder.
In one embodiment of the invention, described coating machine is divided into three roads, and first is base coating machine, adopts scraper for coating mode.Second is curtain coating machine, and San road is that face is coated with coating machine, adopts scraper for coating mode.
In another embodiment of the invention, described coating machine is divided into two roads, and first is curtain coating machine, and second is that face is coated with coating machine, adopts scraper for coating mode.
Described curtain coating machine designs for Double-layer curtain, and it comprises: live-roller, blowing device, boots plate and material loading chamber device; In described curtain coating machine, other devices are same as the prior art.In increasing coating layer thickness, improve it and hide performance, for the base paper coating below 50 degree whiteness, create conditions.Specifically, as shown in accompanying drawing 3 and 4, compare traditional coating method, curtain coating mode of the present invention, operating characteristics is stronger, more advanced.First, coated base paper A enters from the curtain coating machine first half, takes out of by live-roller E revolution.While being coated with program, coating, by exporting in the C of material loading chamber, forms coating curtain, freely falls on paper web.Wherein, in material loading chamber, blowing device B is installed, utilizes blowing to produce negative pressure, air before coating curtain is taken away, control coating curtain, for coating under the high speed of a motor vehicle creates conditions.Blowing device B and lower boots plate D, stablize web tension, prevents paper shake in the time of coating.
Curtain coating mode of the present invention, not only coating weight is more accurate, and easily controls; Meanwhile, owing to adopting untouchable coating method, body paper is not applied to any mechanical external force, effectively reduce the probability of disconnected paper, produce possibility is provided for the high speed of a motor vehicle.
Another object of the present invention is to provide a kind of method that uses described curtain coating white-top kraft liner board production equipment to produce coated white-top kraft liner board, and it comprises the following steps:
(1) prepare respectively surface layer slurry, center stock and base pastes;
(2) by described surface layer slurry, center stock and base pastes process triple-lap wet end drainage and formation, compound, manufacture paper with pulp and make base board;
(3) base board is dried through press section three road shoe press dehydrations, front baking cadre again, enters size presser, carries out the applying glue of the positive back side, then dries and hard press polish through post-drying portion; The resin added of described size press is 1～4/m2, the line pressure of described hard press polish is 20～60KN/m, and the pressure of described three road shoe press is that one boots line ball pressure is 500 ~ 1000KN/m, and two road boots line ball pressure are 500 ~ 1000KN/m, and three road boots formula glazing press pressure are 400 ~ 800KN/m;
(4) cardboard after hard press polish is coated with through 2 or 3 coating machines successively;
(5) after coating, craft paper carries out soft calendaring again, and soft calendaring line pressure is 20～60KN/m, and 100～150 DEG C of temperature, then obtain coated white-top kraft liner board through cans.
Wherein, the Deinking Pulp that surface layer slurry described in step (1) is made up of Mixed Office WasteMOW or waste and old books paper, magazine paper and the newspaper of 0 ~ 30% wood pulp and 70 ~ 100% forms, the Deinking Pulp that described center stock is made up of 100% Mixed Office WasteMOW or waste and old books paper, magazine paper and newspaper forms, and described base pastes is made up of 100% OCC secondary stock.
Wherein, described in step (2), the weight proportion of surface layer slurry, center stock and base pastes is 8～15%:10～30%:55～80%;
Wherein, described in step (3), the line pressure of hard press polish is preferably 30～50KN/m, 120 ~ 180 DEG C of temperature.
Wherein, the concrete grammar being coated with through two or three coating machines successively described in step (4) is: in the time adopting 2 coating machines to carry out two roads coatings, first is curtain coating, adopts curtain coating machine to be coated with, and is directly coated on surface layer slurry; Second is finishing coat, adopts knife type coater to be coated with, and is directly coated in curtain coating; Adopt 3 coating machines to carry out for 3 roads whens coating, first is priming coat, adopts knife type coater to be coated with, and is directly coated on surface layer slurry; Second is curtain coating, adopts curtain coating machine to be coated with, and is directly coated on precoated shet; San road is finishing coat, adopts knife type coater to be coated with, and is directly coated in curtain coating; The coating weight of described priming coat is 3～15g/m2, the coating weight of curtain coating is 4～28g/m2, the coating weight of finishing coat is 8～15g/m2; After described each coating completes, all to carry out heated-air drying; In a further preferred embodiment, the coating weight of described priming coat is preferably 9～13g/m2, the coating weight of described curtain coating is preferably 10～12g/m2, the coating weight of described finishing coat is preferably 9～12g/m2.
Wherein, described in step (5), soft calendaring line pressure is preferably 30～50KN/m.
Adopt technique scheme, the present invention compared with prior art tool has the following advantages:
1. the present invention adopts and has up-to-date breakthrough curtain coating covering technique, can on common craft paper, be coated with, require low to original paper quality, the wastepaper as raw material that uses can adopt full secondary stock to reclaim and starch and carry out body paper production, do not use wood pulp, both environmental protection, is conducive to again the reduction of production cost.The technical barrier that can only be coated with on white-top kraft liner board before having overcome.As, traditional craft paper can only be coated with more than body paper whiteness 70 degree, becomes paper just can reach 80 above requirements.And adopt after curtain coating technology, can on the paper below 50 degree, produce, become paper equally to reach the above requirement of 80 degree.
2. the present invention adopts curtain coating Non-Contact Coating technology, the probability of the disconnected paper in coating machine region reduces greatly, can significantly promote online coated paper speed of production, and the speed of online coating machine is reached more than 1000 ms/min, be not only domestic initiation, also promoted painting production capacity simultaneously.
3. the present invention adopts the paper machine with up-to-date breakthrough curtain coating, can be optimization body paper raw materials for production, and according to client's needs, adopt different coating combinations, for producing different high-quality coated craft papers, creates possibility.
4. the present invention adopts novel Non-Contact Coating technology, and owing to adopting Double-layer curtain coating, coating layer thickness is high simultaneously, and covering is good, and printing-ink absorbability is high, has significantly improved the printing adaptability of paper layer.
5. the present invention adopts three road Technology in Pressing, and the quality of the former paper material greatly improving, for high speed of a motor vehicle operation provides guarantee.
brief description of the drawings:
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
Fig. 1 is the coated white-top kraft liner board structural representation of producing according to curtain coating white-top kraft liner board production equipment of the present invention.Wherein: a, coating layer; B, surface layer; C, sandwich layer; D, bottom.
Fig. 2 is the structural representation of curtain coating craft paper production equipment of the present invention.Wherein: 1, wet end, bottom band top net; 2, top net; 3, press section, twice shoe press; 5, front baking cadre; 6, size presser; 7, post-drying portion; 8, hard calender; 9, precoating coating machine; 10, curtain is coated with coating machine; 11, face is coated with coating machine; 12, soft press-polishing machine; 13, reel machine.
Fig. 3 is curtain coating machine internal structure schematic diagram of the present invention.
Fig. 4 is the dependency structure schematic diagram of coating place in curtain coating machine internal structure of the present invention.
Detailed description of the invention
embodiment 1
As shown in Figure 2, a kind of Novel curtain formula production equipment for white surface coating kraft, comprises wet end 1, press section 3, front baking cadre 5, size presser 6, post-drying portion 7, hard calender 8, coating machine 9 ~ 11 and soft press-polishing machine 12, reel machine 13 that along continuous straight runs sets gradually.Wherein, wet end 1 is bottom band top net, press section 3 Wei San road shoe press, and coating machine 9 is precoating scraper type coating machine, and coating machine 10 is curtain painting formula coating machine, and coating machine 11 is that face is coated with scraper type coating machine.
The step of taking above-mentioned Novel curtain formula coated white-top kraft liner board machine to carry out papermaking is as follows:
Prepare respectively surface layer slurry, center stock and base pastes; Surface layer slurry is made up of 100% OCC secondary stock, and described center stock is made up of 100% OCC secondary stock, and described base pastes is made up of 100% OCC secondary stock.The weight proportion of surface layer slurry, center stock and base pastes is 8%:25%:67%; Through triple-lap wet end drainage and formation, compound, manufacture paper with pulp and make base board.Base board dewaters through the high mechanical pressure of press section again, and one boots line ball pressure is 700KN/m, and two road boots line ball pressure are 1000KN/m, and three road boots formula glazing press pressure are 700KN/m;
。Dry by front baking cadre, enter size presser, carry out positive backside surface applying glue, resin added is 1g/m2.Cardboard after top sizing, after dry oven dry later, then by firmly compressing into the smooth modification of row, enters the coating machine stage.Described front baking cadre adopts 3 road list linked networks to arrange the two linked networks of drying cylinders and 4 roads and arranges drying cylinder, and described post-drying portion adopts 2 road list linked networks to arrange the two linked networks of drying cylinders and 1 road and arranges drying cylinder, and described hard press polish line pressure is 50KN/m, 120 DEG C of temperature;
Cardboard after hard press polish is successively through three coating machines, then batches after soft calendaring, completes the whole workshop section that manufactures paper with pulp; The coating weight of described primary coat is 8g/m2, the coating weight that curtain is coated with is 10g/m2, the coating weight that face is coated with is 8g/m2.After described each coating completes, all to carry out heated-air drying.After coating, craft paper carries out soft calendaring again, and described soft calendaring line pressure is 20KN/m, 120 DEG C of temperature.Obtain coated craft paper through cans.
embodiment 2
Prepare respectively surface layer slurry, center stock and base pastes; Surface layer slurry is made up of 100% deinked pulp, and described center stock is made up of 100% OCC secondary stock, and described base pastes is made up of 100% OCC secondary stock.
Wherein, described in step (2), the weight proportion of surface layer slurry, center stock and base pastes is 10%:15%:75%; Through triple-lap wet end drainage and formation, compound, manufacture paper with pulp and make base board.Base board dewaters through the high mechanical pressure of press section again, and one boots line ball pressure is 700KN/m, and two road boots line ball pressure are 900KN/m, and three road boots formula glazing press pressure are 500KN/M.Dry by front baking cadre, enter size presser, carry out positive backside surface applying glue, resin added is 2g/m2.Cardboard after top sizing, after dry oven dry later, then by firmly compressing into the smooth modification of row, enters the coating machine stage.Described front baking cadre adopts 3 road list linked networks to arrange the two linked networks of drying cylinders and 4 roads and arranges drying cylinder, and described post-drying portion adopts 2 road list linked networks to arrange the two linked networks of drying cylinders and 1 road and arranges drying cylinder, and described hard press polish line pressure is 30KN/m, 130 DEG C of temperature;
Cardboard after hard press polish is successively through three coating machines, then batches after soft calendaring, completes the whole workshop section that manufactures paper with pulp; The coating weight of described primary coat is 3g/m2, the coating weight that curtain is coated with is 20g/m2, the coating weight that face is coated with is 10g/m2.After described each coating completes, all to carry out heated-air drying.After coating, craft paper carries out soft calendaring again, and described soft calendaring line pressure is 60KN/m, 100 DEG C of temperature; Obtain coated craft paper through cans.
embodiment 3
Prepare respectively surface layer slurry, center stock and base pastes; Surface layer slurry is made up of 30% wood pulp and 70% pulp from decoloured waste paper, and the Deinking Pulp that described center stock is made up of 50% magazine paper and 59% newspaper forms, and described base pastes is made up of 100% OCC secondary stock.
Wherein, described in step (2), the weight proportion of surface layer slurry, center stock and base pastes is 15%:20%:65%; Through triple-lap wet end drainage and formation, compound, manufacture paper with pulp and make base board.Base board dewaters through the high mechanical pressure of press section again, and one boots line ball pressure is 600KN/m, and two road boots line ball pressure are 1000KN/m, and three road boots formula glazing press pressure are 800KN/m.Dry by front baking cadre, enter size presser, carry out positive backside surface applying glue, resin added is 3.5g/m2.Cardboard after top sizing, after dry oven dry later, then by firmly compressing into the smooth modification of row, enters the coating machine stage.Described front baking cadre adopts 3 road list linked networks to arrange the two linked networks of drying cylinders and 4 roads and arranges drying cylinder, and described post-drying portion adopts 2 road list linked networks to arrange the two linked networks of drying cylinders and 1 road and arranges drying cylinder, and described hard press polish line pressure is 20KN/m, 180 DEG C of temperature;
Cardboard after hard press polish is successively through three coating machines, then batches after soft calendaring, completes the whole workshop section that manufactures paper with pulp; The coating weight of described primary coat is 9g/m2, the coating weight that curtain is coated with is 16g/m2, the coating weight that face is coated with is 12g/m2.After described each coating completes, all to carry out heated-air drying.After coating, craft paper carries out soft calendaring again, and described soft calendaring line pressure is 60KN/m, 110 DEG C of temperature; Obtain coated craft paper through cans.
embodiment 4
Prepare respectively surface layer slurry, center stock and base pastes; Surface layer slurry is made up of the pulp from decoloured waste paper of 20% bleached wood pulp and 80%, and described center stock is made up of 100% OCC secondary stock, and described base pastes is made up of 100% OCC secondary stock.
Wherein, described in step (2), the weight proportion of surface layer slurry, center stock and base pastes is 9%:20%:71%; Through triple-lap wet end drainage and formation, compound, manufacture paper with pulp and make base board.Base board dewaters through the high mechanical pressure of press section again, and one boots line ball pressure is 900KN/m, and two road boots line ball pressure are 1000KN/m, and three road boots formula glazing press pressure are 800KN/M.Dry by front baking cadre, enter size presser, carry out positive backside surface applying glue, resin added is 1.5g/m2.Cardboard after top sizing, after dry oven dry later, then by firmly compressing into the smooth modification of row, enters the coating machine stage.Described front baking cadre adopts 3 road list linked networks to arrange the two linked networks of drying cylinders and 4 roads and arranges drying cylinder, and described post-drying portion adopts 2 road list linked networks to arrange the two linked networks of drying cylinders and 1 road and arranges drying cylinder, and described hard press polish line pressure is 50KN/m, 150 DEG C of temperature;
Cardboard after hard press polish is successively through three coating machines, then batches after soft calendaring, completes the whole workshop section that manufactures paper with pulp; The coating weight of described primary coat is 10g/m2, the coating weight that curtain is coated with is 12g/m2, the coating weight that face is coated with is 10g/m2.After described each coating completes, all to carry out heated-air drying.After coating, craft paper carries out soft calendaring again, and described soft calendaring line pressure is 50KN/m, 110 DEG C of temperature; Obtain coated craft paper through cans.
embodiment 5
In production equipment, coating machine is twice, is followed successively by curtain and is coated with formula coating machine 10, and face is coated with scraper type coating machine 11, and other equipment are identical with embodiment 1-4.
Prepare respectively surface layer slurry, center stock and base pastes; Surface layer slurry is made up of 30% wood pulp and 70% OCC secondary stock, and described center stock is made up of 100% OCC secondary stock, and described base pastes is made up of 100% OCC secondary stock.The weight proportion of surface layer slurry, center stock and base pastes is 10%:15%:75%; Through triple-lap wet end drainage and formation, compound, manufacture paper with pulp and make base board.Base board dewaters through the high mechanical pressure of press section again, and one boots line ball pressure is 900KN/m, and two road boots line ball pressure are 1000KN/m, and three road boots formula glazing press pressure are 800KN/m.Dry by front baking cadre, enter size presser, carry out positive backside surface applying glue, resin added is 1g/m2.Cardboard after top sizing, after post-drying portion dries, then by firmly compressing into the smooth modification of row, enters the coating machine stage.Described front baking cadre adopts 3 road list linked networks to arrange the two linked networks of drying cylinders and 4 roads and arranges drying cylinder, and described post-drying portion adopts 2 road list linked networks to arrange the two linked networks of drying cylinders and 1 road and arranges drying cylinder, and described hard press polish line pressure is 30KN/m, 120 DEG C of temperature;
Cardboard after hard press polish is successively through two coating machines, then batches after soft calendaring, completes the whole workshop section that manufactures paper with pulp; Obtain coated craft paper.The coating weight that described curtain is coated with is 12g/m2, the coating weight that face is coated with is 6g/m2.After described each coating completes, all to carry out heated-air drying.After coating, craft paper carries out soft calendaring again, and described soft calendaring line pressure is 30KN/m, 120 DEG C of temperature.
embodiment 6
Coating machine is followed successively by curtain and is coated with formula coating machine 10, and face is coated with scraper type coating machine 11, and other equipment are identical with embodiment 1-4.
Prepare respectively surface layer slurry, center stock and base pastes; Surface layer slurry is made up of 100% deinking paper pulp, and the Deinking Pulp that described center stock is made up of 100% Mixed Office WasteMOW or waste and old books paper, magazine paper and newspaper forms, and described base pastes is made up of 100% OCC secondary stock.The weight proportion of surface layer slurry, center stock and base pastes is 8%:25%:67%; Through triple-lap wet end drainage and formation, compound, manufacture paper with pulp and make base board.Base board dewaters through the high mechanical pressure of press section again, and one boots line ball pressure is 1000KN/m, and two road boots line ball pressure are 1000KN/m, and three road boots formula glazing press pressure are 1000KN/m.Dry by front baking cadre, enter size presser, carry out positive backside surface applying glue, resin added is 1g/m2.Cardboard after top sizing, after dry oven dry later, then by firmly compressing into the smooth modification of row, enters the coating machine stage.Described front baking cadre adopts 3 road list linked networks to arrange the two linked networks of drying cylinders and 4 roads and arranges drying cylinder, and described post-drying portion adopts 2 road list linked networks to arrange the two linked networks of drying cylinders and 1 road and arranges drying cylinder, and described hard press polish line pressure is 30KN/m, 120 DEG C of temperature;
Cardboard after hard press polish is successively through two coating machines, then batches after soft calendaring, completes the whole workshop section that manufactures paper with pulp; Obtain coated craft paper.The coating weight that described curtain is coated with is 3g/m2, the coating weight that face is coated with is 10g/m2.After described each coating completes, all to carry out heated-air drying.After coating, craft paper carries out soft calendaring again, and described soft calendaring line pressure is 60KN/m, 120 DEG C of temperature.
embodiment 7
Coating machine is followed successively by curtain and is coated with formula coating machine 10, and face is coated with scraper type coating machine 11, and other equipment are identical with embodiment 1-4.
Prepare respectively surface layer slurry, center stock and base pastes; Surface layer slurry is made up of 100% OCC secondary stock, and described center stock is made up of 100% OCC secondary stock, and described base pastes is made up of 100% OCC secondary stock.The weight proportion of surface layer slurry, center stock and base pastes is 10%:20%:70%; Through triple-lap wet end drainage and formation, compound, manufacture paper with pulp and make base board.Base board dewaters through the high mechanical pressure of press section again, and one boots line ball pressure is 1000KN/m, and two road boots line ball pressure are 1000KN/m, and three road boots formula glazing press pressure are 700KN/m.Dry by front baking cadre, enter size presser, carry out positive backside surface applying glue, resin added is 1.5g/m2.Cardboard after top sizing, after dry oven dry later, then by firmly compressing into the smooth modification of row, enters the coating machine stage.Described front baking cadre adopts 3 road list linked networks to arrange the two linked networks of drying cylinders and 4 roads and arranges drying cylinder, and described post-drying portion adopts 2 road list linked networks to arrange the two linked networks of drying cylinders and 1 road and arranges drying cylinder, and described hard press polish line pressure is 50KN/m, 120 DEG C of temperature;
Cardboard after hard press polish is successively through two coating machines, then batches after soft calendaring, completes the whole workshop section that manufactures paper with pulp; Obtain coated craft paper.The coating weight that described curtain is coated with is 10g/m2, the coating weight that face is coated with is 12g/m2.After described each coating completes, all to carry out heated-air drying.After coating, craft paper carries out soft calendaring again, and described soft calendaring line pressure is 50KN/m, 120 DEG C of temperature.
The performance indications of coated craft paper prepared by above-described embodiment 1-7 see the following form:
The effect of above embodiment 1-7 proves, carry out the production of coated craft paper according to the present invention, adopt up-to-date breakthrough curtain coating technology, on common craft paper, carry out high-speed coating, the speed of a motor vehicle can reach more than 1000 ms/min, meanwhile, even if body paper whiteness is in 40 degree left and right, after processing by curtain coating, one-tenth paper whiteness is the same can reach the above customer requirement of 80 degree.And, the coated white-top kraft liner board of producing, intensity is high, smoothness good, and printing performance brilliance can substitute the coated craft paper being coated with on common white vermicelli in the market completely.The utilization of curtain coating technology, the technical barrier that can only be coated with on white-top kraft liner board before having solved, and, because be is coated with on common craft paper, not using wood pulp, both environmental protection, are conducive to again the reduction of production cost.
In addition, applicant finds to adopt three road squeezings very necessary at press section by test, can greatly improve original paper quality.In the time adopting two road shoe press, due to the problem of former paper material, under the condition of performance indications that ensures coated craft paper, the production speed of a motor vehicle is the highest in 500m/min left and right.And the order no less important of three road coating machines, is exchanging after the order of curtain painting coating machine and knife type coater, can not ensure equally the high speed of a motor vehicle operation (concrete test data is not listed one by one at this) of production equipment.
More than the basic manufacture principles illustrated that the present invention is made, and the production technology procedure declaration of the curtain coating white-top kraft liner board of producing by the present invention.The technical staff of the industry is more clearly; the present invention is not restricted to the described embodiments; can not limit the scope of the invention with this, every according to general principle of the present invention or improvement and the variation carried out on this basis, all should be in the claimed scope of the present invention.