CN104695277A - Decorative plate finishing paper and production method thereof - Google Patents

Abstract

The purpose of this invention is to use a new type of decorative panel facing paper to replace veneer and technical wood for wood-based panel veneer. The base paper is 150-350g/m ² . Other artistic patterns, the effect is realistic after pressing. The main purpose of adding chemical fiber to the decorative base paper of the decorative board in the present invention is to increase the strength of the paper and make the paper soft and tough. The product of the invention is mainly used for veneering wood-based panels such as fiberboards and particle boards, and can replace veneer materials such as veneer and technical wood. The veneer paper of the invention can also be coated with flame-retardant glue, which has flame-retardant properties.

Description

A decorative board facing paper and its production method

technical field

The invention belongs to the technical field of special paper for veneering wood-based panels, and in particular relates to a novel decorative panel veneer paper and a production method thereof.

Background technique

Domestic traditional wood-based panel decorative panel materials include veneer, technical wood, impregnated decorative base paper, polyolefin (Oxy) film, etc. veneer, also known as veneer, is a thin wood veneer with the characteristics of precious tree species. Or veneer materials, the common species of veneer used for furniture veneer are ash, oak, catalpa, elm, southwest birch, more precious cherry wood, black walnut, red oak and more high-end such as White shadow wood, teak, rosewood, rosewood, rosewood, etc. Technological wood is also called artificial veneer. It is a sliced veneer made of rotary-cut veneer of general tree species imitating the color tone of natural wood or precious tree species, and then glued into wood according to the fiber direction. Impregnated decorative base paper is a kind of industrial special paper made of wood pulp and titanium dioxide as the main raw materials through special process. Layer paper and bottom paper. Polyolefin (Oxy) film is a plastic decorative substrate. The veneer wood and technical wood for the above-mentioned decorative panels need to use a large amount of wood, and the production process of technical wood and impregnated decorative base paper requires a large amount of melamine-formaldehyde resin, adhesives and additives, colorants (including dyes and pigments), etc. Polyolefin (Oxy) film is plastic and cannot be degraded naturally.

Contents of the invention

The purpose of this invention is to use a new type of decorative board veneer paper to replace veneer and technical wood for wood-based panel veneer ^. Pressing and pasting can also directly simulate and print increasingly rare natural and precious tree species on the surface, and can also create and print other artistic patterns, and the effect after pressing and pasting is realistic.

The main purpose of adding chemical fibers to the decorative board decorative paper in the present invention is to increase the strength of the paper and make the paper soft and tough.

The product of the present invention is used after compounding with printed decorative paper or directly printed and pasted. It is mainly used for veneering wood-based panels such as fiberboard and particle board, and can replace veneer, technical wood and other veneer materials. The decorative paper of the present invention can also be coated with There are flame retardant glue, with flame retardant properties.

The present invention claims to protect a decorative board facing paper, which is characterized in that the decorative board facing paper is produced from the following raw materials in weight percentage:

Wood pulp 65%—90%

Chemical fiber 5%—25%

Additives 5%—10%

The decorative board decorative paper adds a coating process and an impregnation process in the drying section of the paper machine, wherein the total mass of the coating glue and impregnating glue to the paper weight ratio of the base paper is respectively:

Coating glue 5%—15%

Impregnated glue 10%-15%.

The aforementioned decorative sheet facing paper, wherein:

The wood pulp is long-fiber coniferous wood pulp and short-fiber hardwood pulp, and the percentage by weight of the two is 30%-60% of long-fiber softwood pulp and 40%-70% of short-fiber hardwood pulp;

The chemical fiber is one or more of polyester, nylon, acrylic, polyvinyl chloride, and vinylon, with a fineness of 1-10D and a length of 5-20mm;

The percentage by weight of the additives is: polyacrylamide 1%-4%, polyamide epichlorohydrin 4%-6%;

In the coating glue, each component is calculated as follows in terms of absolute dry weight: 5%-10% of titanium dioxide, 10%-25% of calcium powder, 15%-30% of polyvinyl alcohol, 3% of dispersant, 2% anti-water agent, 30%-65% latex;

In the impregnating glue, each component is calculated by weight ratio: 25%-40% of melamine modified urea-formaldehyde glue, 1% of modified glycerin, 5% of modified starch, 5% of polyvinyl alcohol, penetrant JF- C2%, polybutadiene resin 57%-62%;

The paper-forming index of the new-type decorative board veneer base paper is as follows: basis weight 150-350g/ ^m2 , thickness 0.8-2.5mm, tensile strength greater than 5kn/m, tearing degree greater than 3500mn in the longitudinal direction and greater than 4000mn in the transverse direction. The degree is greater than 500kpa;

The base paper also needs to be coated with a modified flame retardant solution, which is prepared by adding a flame retardant and a modifier into acrylic latex and stirring evenly.

The preparation method of the aforesaid decorative plate facing paper is characterized in that it comprises the following steps:

A. Put the chemical fiber in a high-speed hydraulic mixer for dispersion. The steps are to first soak the chemical fiber and 15% sodium hydroxide solution at a weight ratio of 1:1.5 for 20 minutes, then filter out the water, and put it in clean water. The weight ratio of chemical fiber and clear water is 1:200, and the stirring time is 20 minutes;

B. Disintegrate the long-fiber wood pulp and short-fiber wood pulp in a hydraulic pulper in proportion to a concentration of 4%-6%, add the dispersed chemical fiber after 30 minutes of disintegration, and then stir for 20-30 minutes;

C. Add wood pulp and chemical fiber according to the following weight ratio, and add the following additives in the filling tank, pump it into the forebay tank after mixing, add water to adjust the concentration to 0.8%-1.2%;

Wood pulp 65%—90%

Chemical fiber 5%—25%

Auxiliary 5%—10%

D. In order to make the chemical fiber disperse evenly during the sizing process, use a special high-pressure slurry distributor to deliver slurry to the headbox through multiple flexible plastic hoses. This slurry distribution method eliminates the pulse oscillation of the equipment and the slurry Multiple symmetrical flows are formed in the headbox by means of flow diversion, so that the slurry flow in the vertical and horizontal direction of the slurry is consistent;

E. Using fourdrinier paper machine to make paper;

F. Filter the water through the forming net, squeeze, and dry in the first drying zone, then carry out in-machine coating, and the coating amount is 5%-15%;

G. After drying in the oven in the second drying zone, perform soft calendering, and then impregnate in the machine, and the impregnation amount is 10%-15%;

H. After entering the third drying zone and drying in the oven, make a new type of decorative board facing paper that meets the requirements.

The method for making the aforesaid decorative board facing paper is characterized in that it may also comprise the following steps:

A. Put the chemical fiber in a high-speed hydraulic mixer for dispersion. The steps are to first soak the chemical fiber and 15% sodium hydroxide solution at a weight ratio of 1:1.5 for 20 minutes, then filter out the water, and put it in clean water. The weight ratio of chemical fiber and clear water is 1:200, and the stirring time is 20 minutes;

B. Disintegrate the long-fiber wood pulp and short-fiber wood pulp in a hydraulic pulper in proportion to a concentration of 4%-6%, add the dispersed chemical fiber after 30 minutes of disintegration, and then stir for 20-30 minutes;

C. Add wood pulp and chemical fiber according to the following weight ratio, and add the following additives in the filling tank, pump it into the forebay tank after mixing, add water to adjust the concentration to 0.8%-1.2%;

Wood pulp 65%—90%

Chemical fiber 5%—25%

Auxiliary 5%—10%

D. In order to make the chemical fiber disperse evenly during the sizing process, use a special high-pressure slurry distributor to deliver slurry to the headbox through multiple flexible plastic hoses. This slurry distribution method eliminates the pulse oscillation of the equipment and the slurry Multiple symmetrical flows are formed in the headbox by means of flow diversion, so that the slurry flow in the vertical and horizontal direction of the slurry is consistent;

E. Using fourdrinier paper machine to make paper;

F. Filter the water through the forming net, squeeze, and dry in the first drying zone, then coat in the machine, and the coating amount is 5%-15%;

G. After drying in the second drying zone, carry out impregnation in the machine, and the impregnation amount is 10%-15%;

H. Mix and stir the flame retardant and modifier according to the mass ratio to obtain a modified flame retardant liquid, and stir the modified flame retardant liquid and acrylic latex evenly to obtain a flame retardant sizing liquid;

I. The semi-finished product after the second drying of the base paper in step G is impregnated with a sizing solution on a sizing coater, and the immersion temperature is 10-25° C.;

J. Then dry and gel the sizing solution permeated into the base paper semi-finished product through the hot air circulation system at 120~180°C;

H. After entering the third drying zone to dry, make a new type of decorative board facing paper that meets the requirements. The first drying zone is a drying cylinder, and the second and third drying zones are drying in a hot air circulation oven.

The present invention adopts in-machine coating in F step, and operates on the sizing coater in step I, can also adopt the roll coating mode of automatic control, is equipped with electronic control system to control the roll coating process, and input base paper thickness to it Parameters, as well as the size of the downforce during roller coating, to control the final thickness of the additional coating between 0.01-0.1mm;

The roller coating can also be roller-coated on the upper and lower surfaces of the base paper semi-finished product, which can be respectively provided with two coating rollers up and down, start the roller coating machine, adjust the gap between the upper and lower coating rollers to be 1-3mm smaller than the thickness of the semi-finished material, and use the coating The action of the roller makes the semi-finished material advance with the direction of roller coating, and evenly rolls the flame-retardant sizing solution in the coating roller on the surface of the semi-finished product during the advancing process;

The flame retardant may be a phosphorus-based flame retardant, a nitrogen-based flame retardant or a phosphorus-nitrogen-based flame retardant, specifically trihydroxymethylphosphine oxide (THPO) or diphenyl phosphate (BDP);

Described modifying agent can be dimethyl tin oxide or/and dibutyl tin dichloride;

Flame retardants can also use bisphenol A-bis (diphenyl phosphate), that is, BDP is an environmentally friendly non-halogenated organophosphorus flame retardant, suitable for thermoplastic materials, especially for PC/ABS blends. combustion modification.

Trihydroxymethyl phosphine oxide (THPO) and diphenyl phosphate (BDP) modified with modifiers dimethyl tin oxide and dibutyl tin dichloride can have stable and excellent flame retardant properties. In the invention, the flame retardant and the modifying agent are mixed and stirred evenly to obtain a modified flame retardant liquid, and the modified flame retardant liquid is immediately added to the acrylic latex and stirred evenly to obtain a sizing liquid. The use of modifiers keeps the flame retardants stable at higher activity. The latex plays a role of wrapping the modified flame retardant liquid, keeping the activity of the modified flame retardant liquid and penetrating into the fiber pores of the wallpaper base paper. Compared with the existing high-priced flame-retardant latex and flame-retardant chemical fibers, the flame-retardants and modifiers used in the present invention are cheap, and can achieve flame-retardant effects when matched with non-flame-resistant chemical fibers. By adopting the method of the invention, the cost of the base paper for the flame-retardant facing paper can be reduced.

Compared with prior art, the beneficial effect that the present invention has is:

1. In the present invention, chemical fiber is added to the slurry, so that the paper has the thickness and softness of veneer, and the strength is increased, which is beneficial to subsequent production.

2. Due to the flatness of paper, most of the processes in the production process of veneer and technical wood are omitted, such as veneer splicing and trimming, which not only saves a lot of wood but also saves labor costs.

3. Since veneer processing is mostly family workshop production, links such as rinsing, printing and dyeing, and gluing in the processing process produce a large amount of pollution, and the present invention is to replace wood with paper, large-scale modern paper machine production, pollution centralized treatment.

4. The present invention is produced by in-machine coating and in-machine impregnation processes. Titanium dioxide is coated on the surface of paper, which saves titanium dioxide compared to filling in pulp, and the printing effect is good. After printing wood grain and dipping, it passes through hot pressing equipment Pressing and pasting on wood-based boards such as fiberboard, particle board, and density board can achieve the effect of veneer and technical wood veneer.

The present invention achieves the effect of replacing wood veneer by adopting the above production method. By printing wood grain decoration, the felling of precious wood can be greatly reduced, the precious tree species are protected, wood is saved, and the price is relatively low. Environmental protection has important practical significance and can greatly promote the rapid development of the downstream wood-based panel production industry.

Detailed ways:

Embodiment 1,

Fiber ratio: 80% by weight of wood pulp, 32% of long-fiber coniferous wood pulp, 48% of short-fiber hardwood pulp, 15% of functional fiber polyester, fiber fineness of 2D, length of 5mm, and additive 5 %, of which polyacrylamide 1%, polyamide epichlorohydrin 4%.

In-machine coating: coating liquid concentration 6%, polyvinyl alcohol 20%, dispersant 3%, water repellant 2%, titanium dioxide 5%, calcium powder 10%, latex 60%. The amount used for coating accounts for 5% of the total weight of the aforementioned three main raw materials.

In-machine impregnation: impregnation formula, melamine modified urea-formaldehyde glue 30%, modified glycerin 1%, modified starch 5%, polyvinyl alcohol 5%, penetrant JF-C 2%, polybutadiene resin 57%. The impregnation amount is 10%.

The basis weight of the finished paper is 150g/m ² , the thickness is 0.9mm, the tensile strength is 5.2kn/m, the tearing degree is 3800mn in longitudinal direction, 4600mn in transverse direction, and the bursting strength is 520kpa.

The base paper also needs to be coated with a modified flame retardant solution, which is prepared by adding a flame retardant and a modifier into acrylic latex and stirring evenly. The flame retardant may specifically be trihydroxymethyl phosphorus oxide (THPO).

The production method is characterized in that it comprises the steps of:

In step B, the concentration is 4%, and then stirred for 20 minutes;

In step C, adjust the concentration to 0.8%;

In step F, the coating amount is 5%;

In step G, the impregnation amount is 10%;

In step J, circulate hot air at 130°C.

Embodiment 2,

Fiber ratio: 78% by weight of wood pulp, 38% of long-fiber softwood pulp, 40% of short-fiber hardwood pulp, 7% of polyester, and 9% of nylon. The fineness of the two fibers is 5D, and the length is 10mm. Add The solid content of additives is 6%, including 2% polyacrylamide and 4% polyamide epichlorohydrin.

In-machine coating: coating liquid concentration 10%, polyvinyl alcohol 25%, dispersant 3%, water repellant 2%, titanium dioxide 10%, calcium powder 20%, latex 40%. The amount used for coating accounts for 8% of the total weight of the aforementioned three main raw materials.

In-machine impregnation: impregnation formula, melamine modified urea-formaldehyde glue 25%, modified glycerin 1%, modified starch 5%, polyvinyl alcohol 5%, penetrant JF-C 2%, polybutadiene resin 62%. The impregnation amount is 8%.

The basis weight of the finished paper is 320g/m ² , the thickness is 2.4mm, the tensile strength is 6.5kn/m, the tearing degree is 5200mn in the longitudinal direction, 5700mn in the transverse direction, and the bursting strength is 530kpa.

The base paper also needs to be coated with a modified flame retardant solution, which is prepared by adding a flame retardant and a modifier into acrylic latex and stirring evenly. The flame retardant may specifically be polybrominated diphenyl ethers.

The production method is characterized in that it comprises the steps of:

In step B, the concentration is 4.5%, and then stirred for 23 minutes;

In step C, adjust the concentration to 0.9%;

In step F, the coating amount is 7%;

In step G, the impregnation amount is 12%;

In step J, circulate hot air at 150°C.

Example 3:

Fiber ratio: 78% by weight of wood pulp, 30% of long-fiber coniferous wood pulp, 48% of short-fiber hardwood pulp, 9% of functional fibers polyester and 5% of vinylon, the fineness of both fibers is 3D, The length is 5mm, and 8% of additives are added, including 3% of polyacrylamide and 5% of polyamide epichlorohydrin.

In-machine coating: coating liquid concentration 8%, polyvinyl alcohol 20%, dispersant 3%, water repellant 2%, titanium dioxide 5%, calcium powder 10%, latex 60%. The amount used for coating accounts for 7% of the total weight of the aforementioned three main raw materials.

In-machine impregnation: impregnation formula, melamine modified urea-formaldehyde glue 35%, modified glycerin 1%, modified starch 5%, polyvinyl alcohol 5%, penetrant JF-C 2%, polybutadiene resin 52%. The impregnation amount is 12%.

The basis weight of the finished paper is 220g/m ² , the thickness is 1.3mm, the tensile strength is 6kn/m, the tearing degree is 5000mn in the longitudinal direction, 5200mn in the transverse direction, and the bursting strength is 510kpa.

The base paper also needs to be coated with a modified flame retardant solution, which is prepared by adding a flame retardant and a modifier into acrylic latex and stirring evenly. The flame retardant may specifically be tetrabromobisphenol A.

The production method is characterized in that it comprises the steps of:

In step B, the concentration is 5%, and then stirred for 25 minutes;

In step C, adjust the concentration to 1%;

In step F, the coating amount is 10%;

In step G, the impregnation amount is 13%;

In step J, circulate hot air at 160°C.

the

Example 4

Fiber ratio: 70% by weight of wood pulp, 32% of long-fiber softwood pulp, 38% of short-fiber hardwood pulp, 21% of functional fiber is vinylon, fiber fineness is 2D, length is 4mm, and additive 9 is added %, of which polyacrylamide 3%, polyamide epichlorohydrin 6%.

In-machine coating: coating liquid concentration 9%, polyvinyl alcohol 25%, dispersant 3%, water repellant 2%, titanium dioxide 10%, calcium powder 15%, latex 45%. The amount used for coating accounts for 8% of the total weight of the aforementioned three main raw materials.

In-machine impregnation: impregnation formula, melamine modified urea-formaldehyde glue 27%, modified glycerin 1%, modified starch 5%, polyvinyl alcohol 5%, penetrant JF-C 2%, polybutadiene resin 60%. The impregnation amount is 8%.

The basis weight of the finished paper is 300g/m ² , the thickness is 2.2mm, the tensile strength is 6.1kn/m, the tearing degree is 5300mn in the longitudinal direction, 5400mn in the transverse direction, and the bursting strength is 520kpa.

The base paper also needs to be coated with a modified flame retardant solution, which is prepared by adding a flame retardant and a modifier into acrylic latex and stirring evenly. The flame retardant may specifically be antimony trioxide.

The production method is characterized in that it comprises the steps of:

In step B, the concentration is 6%, and then stirred for 28 minutes;

In step C, adjust the concentration to 1.1%;

In step F, the coating amount is 13%;

In step G, the impregnation amount is 15%;

In step J, circulate hot air at 180°C.

The present invention has specifically adopted the expression of following standard about the test method of paper-forming property:

The preparation of the sample shall be carried out according to the provisions of GB/T 450; the quantitative shall be carried out according to the provisions of GB/T 451.2; the thickness shall be carried out according to the provisions of GB/T 451.3; the longitudinal tensile strength shall be carried out according to the provisions of GB/T 12914; According to the provisions of GB/T 454; tearing according to the provisions of GB/T 455.1.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range. The components and preparation methods involved in the present invention can be adjusted accordingly according to the implementation, but cannot exceed the protection scope of the invention.

Claims (4)

1. a dalle finishing paper, is characterized in that, described dalle finishing paper is produced by the raw material of following weight percentage:

Wood pulp 65%-90%

Chemical fibre 5%-25%

Auxiliary agent 5%-10%

Described dalle finishing paper increases coating process and leaching soaking technology in Dryer Section of Paper Machine, and the paper weight ratio that becomes that wherein coating glue used and the liquid-solid gross mass of impregnated resin account for described base paper is respectively:

Coating glue 5%-15%

Dipping glue 10%-15%.

2. dalle facing base paper as claimed in claim 1, wherein:

Wood pulp is long fiber softwood pulp and staple fibre hardwood pulp, and both weight percents are long fiber softwood pulp 30%-60%, staple fibre hardwood pulp 40%-70%;

Described chemical fibre is one or more in terylene, polyamide fibre, acrylic fibers, polyvinyl chloride fibre, polyvinyl, and fineness is 1-10D, and length is 5-20mm;

Described auxiliary agent weight percent accounting is: polyacrylamide 1%-4%, polyamideepichlorohydrin 4%-6%;

In described coating glue, each composition is counted in accounting for oven dry weight part ratio: titanium dioxide 5%-10%, calcium powder 15%-35%, polyvinyl alcohol 15%-30%, dispersant 3%, water repellent agent 2%, latex 30%-65%;

In described dipping glue, each composition is counted by accounting for weight ratio: melamine modified urea-formaldehyde glue 25%-40%, modified glycerol 1%, modified starch 5%, polyvinyl alcohol 5%, bleeding agent JF-C2%, polybutadiene 57%-62%;

The one-tenth paper index of described Novel decorative board facing base paper is as follows: quantitative 90-200g/m ², thickness 0.8-2.5mm, tensile strength is greater than 5kn/m, and tearability is longitudinally greater than 3500mn, and be laterally greater than 4000mn, bursting strength is greater than 500kpa;

Described base paper also needs coating modified flame-retardant liquid, and modified flame-retardant liquid is for adding acrylate glue Ruzhong and stir and obtaining by fire retardant and modifier.

3. a preparation method for dalle finishing paper, is characterized in that, comprises the steps:

A, chemical fibre is put into high speed hydraulic agitator disperse, its step be by chemical fibre, concentration be first 15% sodium hydroxide solution soak 20 minutes by weight 1:1.5 ratio, then elimination moisture, puts into clear water, chemical fibre and clear water weight ratio are 1:200, and mixing time is 20 minutes;

B, by long fiber wood pulp, staple fibre wood pulp size degradation in hydrabrusher in proportion, concentration is 4%-6%, and size degradation adds the chemical fibre after dispersion after 30 minutes, and then stirs 20-30 minute;

C, wood pulp, chemical fibre add by following weight ratio, and are adding the auxiliary agent filled out in pond and add following weight ratio, and after mixing, suction is destroyed forebay and added water concentration is transferred to 0.8%-1.2%;

Wood pulp 65%-90%

Chemical fibre 5%-25%

Auxiliary agent 5%-10%

D, for making chemical fibre be uniformly dispersed in sizing process, use special large pressure pulp distributor by many flexible plastic hoses cloth slurry modes to the defeated slurry of head box, this cloth slurry mode eliminates device pulse vibration, slurry forms branched symmetric(al) flow by the mode of shunting in head box, and the slurry stream of slurry on vertical banner direction is consistent;

E, employing long mesh paper making machine are manufactured paper with pulp;

F, through forming web drainage, squeezing, after the first dry section drying, carry out on-line coater, coating weight is 5%-15%;

After G, the second dry section drying, carry out dipping in machine, pickup is 10%-15%;

H, enter the 3rd dry section drying after make satisfactory Novel decorative board facing base paper.

4. a preparation method for dalle finishing paper as claimed in claim 2, is characterized in that, comprise the steps:

A, chemical fibre is put into high speed hydraulic agitator disperse, its step be by chemical fibre, concentration be first 15% sodium hydroxide solution soak 20 minutes by weight 1:1.5 ratio, then elimination moisture, puts into clear water, chemical fibre and clear water weight ratio are 1:200, and mixing time is 20 minutes;

B, by long fiber wood pulp, staple fibre wood pulp size degradation in hydrabrusher in proportion, concentration is 4%-6%, and size degradation adds the chemical fibre after dispersion after 30 minutes, and then stirs 20-30 minute;

C, wood pulp, chemical fibre add by following weight ratio, and are adding the auxiliary agent filled out in pond and add following weight ratio, and after mixing, suction is destroyed forebay and added water concentration is transferred to 0.8%-1.2%;

Wood pulp 65%-90%

Chemical fibre 5%-25%

Auxiliary agent 5%-10%

D, for making chemical fibre be uniformly dispersed in sizing process, use special large pressure pulp distributor by many flexible plastic hoses cloth slurry modes to the defeated slurry of head box, this cloth slurry mode eliminates device pulse vibration, slurry forms branched symmetric(al) flow by the mode of shunting in head box, and the slurry stream of slurry on vertical banner direction is consistent;

E, employing long mesh paper making machine are manufactured paper with pulp;

F, through forming web drainage, squeezing, after the first dry section drying, carry out on-line coater, coating weight is 5%-15%;

After G, the second dry section drying, carry out dipping in machine, pickup is 10%-15%;

H, by fire retardant and modifier in mass ratio mixing and stirring obtain modified flame-retardant liquid, modified flame-retardant liquid is stirred together with acrylic latex, obtains fire-retardant glue application solution;

I, by the dried semi-finished product of step G base paper second dipping and gluing liquid on applying glue coating machine, dip time 15 ~ 30 minutes, dipping temperature 10-25 DEG C;

J, then at 120 ~ 180 DEG C by hot air circulating system to the dry gel of the glue application solution of permeating in base paper semi-finished product;

H, enter the 3rd dry section drying after make satisfactory Novel decorative board facing base paper, the first dry section is drying cylinder, and the two or three dry section is that heated-air circulation oven is dry.