Manufacturing process of explosion-proof line virgin wood pulp texture high-quality kraft paper and kraft paper

Abstract

The application discloses a manufacturing process of explosion-proof line virgin wood pulp texture high-quality kraft paper and the kraft paper, and is used for developing a kind of paper surface appearance with tiger skin and wood pulp texture, which is stronger in strength than ordinary kraft paper, can replace some plastic products, and is an environmentally-friendly product.The manufacturing process comprises the following steps: S1, preparing surface layer slurry, core layer slurry and bottom layer slurry, wherein the surface layer slurry is full wood pulp, including Russian kopen wood pulp and reel wood pulp, and the core layer slurry and the bottom layer slurry are waste paper, including national waste ab, middle-end national waste and low-end national waste;S2, the surface layer slurry, the core layer slurry and the bottom layer slurry are transported to the net part, and the wet paper web is formed on the surface layer forming net, the core layer forming net and the bottom layer forming net of the net part;S3, the wet paper web formed by integrating the net part is subjected to dewatering by pressing in the pressing part, and the paper web is sequentially subjected to drying treatment, sizing treatment and calendering treatment, so that the kraft paper product is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking, in particular to a manufacturing process of high-quality kraft paper with explosion-proof original wood pulp texture and the kraft paper. Background Art

[0002] As an important component of commodity packaging paper, kraft paper has a wide range of uses in life.

[0003] The main types of kraft paper used for packaging on the market are Jiuniu, Haiyouniu, Hainiu and Diniu. They are brown in color, with a fine surface and good uniformity. However, the above-mentioned kraft paper has no texture and a relatively simple appearance. The product structure is not rich enough and cannot meet the needs of the market.

[0004] Therefore, finding a technical solution that can solve the above problems has become an important topic studied by those skilled in the art. Summary of the Invention

[0005] The embodiment of the present invention discloses a manufacturing process of high-quality kraft paper with explosion-proof original wood pulp texture and the kraft paper, which is used to solve the problem that the existing kraft paper has no texture on the paper surface and a relatively simple appearance.

[0006] The present invention provides a process for manufacturing high-quality kraft paper with explosion-proof original wood pulp texture, comprising the following steps:

[0007] S1. Prepare surface layer pulp, core layer pulp, and bottom layer pulp, wherein the raw material of the surface layer pulp is whole wood pulp, and the wood pulp includes Russian Koben pulp and reel wood pulp, and the raw materials of the core layer pulp and the bottom layer pulp are waste paper, and the waste paper includes domestic waste of grade AB, mid-end domestic waste, and low-end domestic waste;

[0008] S2. conveying the surface layer slurry, the core layer slurry, and the bottom layer slurry to the wire section, forming a wet paper web on the surface layer forming wire, the core layer forming wire, and the bottom layer forming wire of the wire section, wherein the slurries of the wet paper web are, from top to bottom, the surface layer slurry, the core layer slurry, and the bottom layer slurry in the order of top to bottom;

[0009] S3. The wet paper web formed by the integration of the wire part is pressed and dehydrated in the pressing part, and the dehydrated paper web is dried by a drying cylinder to obtain base paper, and the base paper is subjected to surface sizing and calendering to obtain a finished kraft paper.

[0010] Optionally, in step S1, the raw material wood pulp of the surface layer pulp includes 80% Russian Koppen pulp and 20% rolled wood pulp; the raw material waste paper of the core layer pulp and the bottom layer pulp includes 25% domestic waste ab grade, 50% mid-end domestic waste and 25% low-end domestic waste.

[0011] Optionally, in step S1, the preparation of the surface layer slurry specifically includes:

[0012] a. Use a stirring knife to break up the raw materials of the surface slurry;

[0013] b. Grind the crushed raw materials to obtain surface slurry.

[0014] Optionally, in step a, a stirring blade is used to break up the raw materials of the surface layer slurry to stabilize the feeding and crushing concentration.

[0015] Optionally, in step b, two cone mills are used to perform disc grinding on the crushed raw materials, wherein the pulping concentration is controlled at 3-3.5%, the power of the cone mill is controlled at 650-750 kW, the reflux is controlled at 10-15% opening, and the beating degree is controlled at 15-18° SR.

[0016] Optionally, in step S2, the specific working parameters of the wire section are: setting the target wire section speed to 850m / min; the surface layer slurry quantity of the surface layer forming wire is 20-23gsm; the surface layer slurry concentration control target of the surface layer forming wire is 5%; the speed difference between the surface layer slurry and the forming wire is 8m / min; the vertical opening of the surface layer forming wire lip is 9.4mm; at least two low vacuum boxes are stopped at the surface layer forming gateway, and the waterline is extended; the retention aids of the surface layer slurry, the core layer slurry and the bottom layer slurry are all switched to Percol8038ap and the dosage is 0.38kg / t; the retention aid Perform PC402L in the surface layer slurry is not added, while the core layer slurry and the bottom layer slurry are added normally; in addition, the surface layer slurry and the core layer slurry are increased by spraying starch, wherein the starch concentration is 3-4%; the second stage fine screening of the surface layer slurry is stopped and no slag is discharged.

[0017] Optionally, in step S3, the pressing section performs at least two pressing and dehydration processes on the wet paper web;

[0018] The parameters of the first pressing and dehydration treatment are 600 kN / m; the parameters of the second pressing and dehydration treatment are 950 kN / m.

[0019] Optionally, in step S3, the linear pressure range of the sizing roller during the surface sizing treatment is 32-36 kN / m, the solid content of the sizing on the surface layer of the base paper is set to 8.5%, and the solid content of the sizing on the bottom layer of the base paper is set to 8.3%.

[0020] Optionally, in step S3, the linear pressure range of the calender during the calendering process is 30-35 kN / m, and the temperature is set to 135°C.

[0021] The present invention provides a kind of kraft paper, wherein the kraft paper is manufactured by the above-mentioned explosion-proof line original wood pulp texture high-quality kraft paper manufacturing process.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In the manufacturing process of the explosion-proof line original wood pulp texture high-quality kraft paper in this embodiment, the raw materials of the surface pulp adopt a wood pulp combination of Russian Koben wood pulp and roll wood pulp mainly with long fibers, and the raw materials of the core layer pulp and the bottom layer pulp adopt a waste paper combination including domestic waste ab grade, mid-end domestic waste and low-end domestic waste, and a wood pulp beating method with less cutting and more decomposition is adopted. The surface pulp is sized at a low concentration and the papermaking parameters such as the wire J / W, lip plate opening, and panel vacuum degree are adjusted, and suitable retention aids, spray starch, dyes and other auxiliary materials are used to develop a high-quality kraft paper with tiger skin patterns and wood pulp texture on the surface, which meets the market demand for the appearance of kraft paper products. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic flow chart of a process for manufacturing high-quality kraft paper with an explosion-proof original wood pulp texture provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention discloses a manufacturing process of high-quality kraft paper with an explosion-proof original wood pulp texture and the kraft paper, which are used to develop a paper surface appearance with tiger skin patterns and wood pulp texture. In terms of usability, the kraft paper has higher strength and more advantages than ordinary kraft paper, can replace some plastic products, and is an environmentally friendly product.

[0027] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1 The embodiment of the present invention provides a process for manufacturing high-quality kraft paper with an explosion-proof original wood pulp texture, comprising the following steps:

[0029] S1. Prepare surface layer pulp, core layer pulp, and bottom layer pulp, wherein the raw material of the surface layer pulp is whole wood pulp, and the wood pulp includes Russian Koben pulp and reel wood pulp, and the raw materials of the core layer pulp and the bottom layer pulp are waste paper, and the waste paper includes domestic waste of grade AB, mid-end domestic waste, and low-end domestic waste;

[0030] S2. conveying the surface layer slurry, the core layer slurry, and the bottom layer slurry to the wire section, forming a wet paper web on the surface layer forming wire, the core layer forming wire, and the bottom layer forming wire of the wire section, wherein the slurries of the wet paper web are, from top to bottom, the surface layer slurry, the core layer slurry, and the bottom layer slurry in the order of top to bottom;

[0031] S3. The wet paper web formed by the integration of the wire part is pressed and dehydrated in the pressing part, and the dehydrated paper web is dried by a drying cylinder to obtain base paper, and the base paper is subjected to surface sizing and calendering to obtain a finished kraft paper.

[0032] It should be noted that in step S1 of this embodiment, the core layer slurry and the bottom layer slurry are both prepared using common raw materials in the prior art. Furthermore, the core layer and bottom layer of the kraft paper are both obtained by common papermaking methods, which are not described in detail in this embodiment.

[0033] In addition, the Russian Koppen pulp, rolled wood pulp, domestic waste grade AB, mid-end domestic waste and low-end domestic waste in this embodiment are all existing technologies, and the domestic waste refers to Chinese waste paper.

[0034] , a kind of high-quality kraft paper with tiger skin pattern and wood pulp texture is developed. The tiger skin pattern, as the name suggests, is a texture similar to tiger stripes. This unique texture and high quality give the packaging a refined and elegant appearance, as well as an aesthetic visual enjoyment. Compared with the existing kraft paper, the kraft paper of this embodiment has higher strength and significantly improved explosion-proof line performance, which meets the market demand for the appearance of kraft paper products.

[0035] The performance parameters of the finished kraft paper produced by the manufacturing process in this embodiment are as follows:

[0036] The internal control target value for tear resistance is ≥2.7, the internal control target value for folding resistance is ≥50 times, the interlayer bonding strength is ≥150, and the smoothness is above 6s.

[0037] Furthermore, in step S1 of this embodiment, the raw material wood pulp of the surface layer pulp includes 80% Russian Koben wood pulp and 20% rolled wood pulp, and wood pulp fiber mainly composed of long fibers is selected. The raw material waste paper of the core layer pulp and the bottom layer pulp includes 25% domestic waste ab grade, 50% mid-end domestic waste and 25% low-end domestic waste.

[0038] It should be noted that the above ratio of raw materials is only one specific implementation method in this embodiment. This embodiment does not limit the specific ratio of raw materials of the surface layer slurry. Designers can choose the appropriate ratio of raw materials according to actual conditions.

[0039] Furthermore, in step S1 of this embodiment, the preparation of the surface layer slurry specifically includes:

[0040] a. Use a stirring knife to break up the raw materials of the surface slurry;

[0041] b. Grind the crushed raw materials to obtain surface slurry.

[0042] It should be noted that the above steps can effectively fiberize the raw materials of the surface slurry, which is beneficial to the subsequent manufacturing process.

[0043] Specifically, in the above step a, the raw materials of the surface layer slurry are broken up by a stirring blade to stabilize the feeding and crushing concentration.

[0044] It should be noted that the above design ensures that the raw materials of the surface slurry are fully broken up.

[0045] Specifically, in the above step b, two cone mills are used to perform disc grinding on the crushed raw materials, wherein the pulping concentration is controlled at 3-3.5%, the power of the cone mill is controlled at 650-750kw, the reflux is controlled at 10-15% opening, and the beating degree is controlled at 15-18°SR.

[0046] It should be noted that the above design can effectively increase the fineness of the surface slurry, so that the quality of the subsequently produced kraft paperboard is better.

[0047] Furthermore, in step S2 of this embodiment, the specific working parameters of the mesh section are as follows: the target mesh section speed is set to 850 m / min; the surface layer slurry of the surface layer forming mesh is 20-23 gsm; the surface layer slurry concentration control target of the surface layer forming mesh is 5%; the speed difference between the surface layer forming mesh and the support is 8 m / min; the vertical opening of the lip plate of the surface layer forming mesh is 9.4 mm; at least two low vacuum boxes are stopped at the surface layer forming gateway, and the waterline is extended; the surface layer slurry and the core layer slurry are The retention aid of the bottom layer slurry was switched to Percol8038ap with a dosage of 0.38kg / t; the retention aid Perform402L in the surface layer slurry was not added, and the core layer slurry and the bottom layer slurry were added normally; in addition, spray starch was added to the surface layer core slurry, wherein the starch concentration was 3-4%, so as to ensure the strength of the surface core layer; the second stage fine screening of the surface layer slurry was stopped and no slag was discharged, which is expected to save 10t / d of slurry, save costs and reduce the sewage treatment load.

[0048] It should be noted that, by setting the parameters of the mesh portion as described above, it is possible to produce a kraft paper surface with tiger-skin patterns and wood pulp texture.

[0049] Furthermore, in step S3 of this embodiment, the pressing section performs at least two pressing and dehydration processes on the wet paper web;

[0050] The parameters of the first pressing and dehydration treatment are 600 kN / m; the parameters of the second pressing and dehydration treatment are 950 kN / m.

[0051] It should be noted that the above design can ensure that the wet paper web is fully squeezed and dehydrated, and avoid the moisture content of the dehydrated paper web being too high, which would prolong the subsequent drying time and increase production energy consumption.

[0052] Furthermore, in step S3 of this embodiment, the linear pressure range of the sizing roller during the surface sizing treatment is 32-36 kN / m, the solid content of the sizing on the surface layer of the base paper is set to 8.5%, and the solid content of the sizing on the bottom layer of the base paper is set to 8.3%.

[0053] It should be noted that the above-mentioned surface sizing parameters are set specifically according to the production process requirements, and this embodiment does not impose any restrictions on this. Designers can adjust this according to actual conditions.

[0054] Furthermore, in step S3 of this embodiment, the linear pressure range of the calender during the calendering process is 30-35 kN / m, and the temperature is set to 135°C.

[0055] It should be noted that the above-mentioned calendering processing parameters are set according to the production process requirements, and this embodiment does not limit this. Designers can adjust this according to actual conditions.

[0056] In addition, the aforementioned process for manufacturing high-quality kraft paperboard with virgin wood pulp texture requires the addition of auxiliary materials to the facing pulp. Specifically, the auxiliary material is an anionic styrene-acrylic emulsion at a dosage of 0.38 kg / t. Furthermore, the auxiliary materials also include dyes. The type of dye can be selected and added based on actual production requirements, and this embodiment does not describe this in detail.

[0057] An embodiment of the present invention provides a kind of kraft paper, which is manufactured by the above-mentioned explosion-proof line original wood pulp texture high-quality kraft paper manufacturing process.

[0058] The kraft paper produced by the above-mentioned explosion-proof line original wood pulp texture high-quality kraft paper manufacturing process is specifically a product made of three layers of mesh, namely, a surface layer, a core layer and a bottom layer. The raw materials of the surface pulp adopt a combination of long-fiber Russian Koben wood pulp and roll wood pulp, and the raw materials of the core layer pulp and the bottom layer pulp adopt a combination of waste paper including domestic waste ab grade, mid-end domestic waste and low-end domestic waste, and a wood pulp beating method with less cutting and heavy decomposition is adopted. The surface pulp is sizing at a low concentration and the papermaking parameters such as the wire J / W, lip plate opening, and panel vacuum are adjusted, and suitable retention aids, spray starch, dyes and other auxiliary materials are used to develop a high-quality kraft paper with tiger skin pattern and wood pulp texture. The tiger skin pattern, as the name suggests, is a texture similar to tiger stripes. This unique texture and high texture give the packaging a refined and elegant appearance, as well as an aesthetic visual enjoyment. Compared with the existing kraft paper, the kraft paper of this embodiment has higher strength and significantly improved explosion-proof line performance, which meets the market demand for the appearance of kraft paper products.

[0059] The above is a detailed introduction to the manufacturing process of high-quality kraft paper with original wood pulp texture and explosion-proof line provided by the present invention. For general technicians in this field, according to the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A process for manufacturing high-quality kraft paper with original wood pulp texture for explosion-proof lines, characterized in that: The following steps are involved: S1. Prepare surface layer pulp, core layer pulp, and bottom layer pulp, wherein the raw material of the surface layer pulp is whole wood pulp, and the wood pulp includes Russian Koben pulp and reel wood pulp, and the raw materials of the core layer pulp and the bottom layer pulp are waste paper, and the waste paper includes domestic waste of grade AB, mid-end domestic waste, and low-end domestic waste; S2. conveying the surface layer slurry, the core layer slurry, and the bottom layer slurry to the wire section, forming a wet paper web on the surface layer forming wire, the core layer forming wire, and the bottom layer forming wire of the wire section, wherein the slurries of the wet paper web are, from top to bottom, the surface layer slurry, the core layer slurry, and the bottom layer slurry in the order of top to bottom; S3, pressing and dehydrating the wet paper web formed by the integration of the wire section in a pressing section, drying the dehydrated paper web in a drying cylinder to obtain base paper, and performing surface sizing and calendering on the base paper to obtain a finished kraft paper; In step S1, the raw wood pulp of the surface layer pulp includes 80% Russian Koppen pulp and 20% reel wood pulp; the waste paper of the core layer pulp and the bottom layer pulp includes 25% domestic waste ab grade, 50% mid-end domestic waste and 25% low-end domestic waste; In step S1, the preparation of the surface layer slurry specifically includes: a. Use a stirring knife to break up the raw materials of the surface slurry; b. Grinding the crushed raw materials to obtain surface slurry; In step a, the raw materials of the surface layer slurry are broken up by a stirring blade to stabilize the feeding and crushing concentration; In the step b, two cone mills are used to perform disc grinding on the crushed raw materials, wherein the pulping concentration is controlled at 3.5-4.0%, the power of the cone mill is controlled at 650-750 kW, the reflux is controlled at 10-15% opening, and the beating degree is controlled at 15-18° SR; In step S2, the specific working parameters of the wire section are as follows: the target wire section speed is set to 850 m / min; the surface layer slurry of the surface layer forming wire is 20-23 gsm; the surface layer slurry concentration control target of the surface layer forming wire is 5%; the speed difference between the surface layer slurry and the forming wire is 8 m / min; the vertical opening of the lip of the surface layer forming wire is 9.4 mm; at least two low vacuum boxes are stopped at the surface layer forming gateway, and the waterline is extended; the retention aids of the surface layer slurry, the core layer slurry and the bottom layer slurry are all switched to Percol8038ap with a dosage of 0.38 kg / t; the retention aid Perform PC402L in the surface layer slurry is not added, while the core layer slurry and the bottom layer slurry are added normally; in addition, the surface layer slurry and the core layer slurry are increased by spraying starch, wherein the starch concentration is 3-4%; the second stage fine screening of the surface layer slurry is stopped without slag discharge.

2. The process for manufacturing high-quality kraft paper with original wood pulp texture for explosion-proof line according to claim 1 is characterized in that: In step S3, the pressing section performs at least two pressing and dehydrating processes on the wet paper web; The parameters of the first pressing and dehydration treatment are 600 kN / m; the parameters of the second pressing and dehydration treatment are 950 kN / m.

3. The manufacturing process of explosion-proof line original wood pulp texture high-quality kraft paperboard according to claim 1 is characterized in that: In step S3, the linear pressure range of the sizing roller during the surface sizing treatment is 32-36 kN / m, the solid content of the sizing on the surface layer of the base paper is set to 8.5%, and the solid content of the sizing on the bottom layer of the base paper is set to 8.3%.

4. The process for manufacturing high-quality kraft paper with original wood pulp texture for explosion-proof line according to claim 1 is characterized in that: In the step S3, the linear pressure range of the calender during the calendering process is 30-35 kN / m, and the temperature is set to 135°C.

5. A kraft paperboard, characterized in that: The kraft paper is manufactured by the manufacturing process of high-quality kraft paper with explosion-proof original wood pulp texture as described in any one of claims 1 to 4.

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