Manufacturing process of high-quality kraft paper with explosion-proof raw wood pulp texture and kraft paper

Abstract

The invention discloses a manufacturing process of a high-quality kraft paper with anti-explosion line native wood pulp texture and the kraft paper, which are used for developing a product which has paper appearance with tiger skin texture and wood pulp texture, has higher strength than common kraft paper on the aspect of meeting the use performance, can replace some plastic products and has environmental protection property. The manufacturing process comprises the following steps that S1, surface layer pulp, core layer pulp and bottom layer pulp are prepared, the surface layer pulp is full wood pulp and comprises Russian wood pulp and roll wood pulp, and the core layer pulp and the bottom layer pulp are waste paper and comprise national waste ab grade, middle-end national waste and low-end national waste; s2, conveying the surface layer slurry, the core layer slurry and the bottom layer slurry to a net part, and forming a wet paper web on a surface layer forming net, a core layer forming net and a bottom layer forming net of the net part; s3, wet paper webs formed by net part integration are squeezed and dehydrated through a squeezing part, the paper webs are sequentially subjected to drying treatment, sizing treatment and calendaring treatment, and a finished product of the kraft linerboard is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking, in particular to a manufacturing process of explosion-proof original wood pulp texture high-quality kraft paper 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] At present, the main types of kraft paper used for packaging in the market are Jiuniu, Haiyouniu, Hainiu and Diniu, which are brown in color, with a fine paper surface and good uniformity. However, the above-mentioned kraft paper has no texture on the paper surface 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 invention discloses a manufacturing process of explosion-proof original wood pulp textured high-quality kraft paper and kraft paper, which are 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, the wood pulp includes Russian Koben wood pulp and roll 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 ab grade, 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 part, 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 part, wherein the slurry of the wet paper web is the surface layer slurry, the core layer slurry and the bottom layer slurry in the order from 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. The crushed raw materials are subjected to disc grinding 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 feed 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 650-750kw, 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 mesh section are: the target mesh section speed is set to 850m / min; the surface layer slurry quantity of the surface layer forming mesh is 20-23gsm; the surface layer slurry concentration control target of the surface layer forming mesh is 5%; the speed difference between the surface layer slurry and the forming mesh is 8m / min; the vertical opening of the surface layer forming mesh 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 agent 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.

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

[0018] The parameters of the first pressing and dehydration treatment are 600 kN / m; and 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 the present embodiment, the raw materials of the surface layer pulp adopt a wood pulp combination of Russian Koben wood pulp and roll wood pulp mainly composed of 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. The wood pulp beating method with less cutting and heavy decomposition is carried out, the surface layer pulp is sizing at a low concentration and the papermaking parameters such as the J / W of the mesh part, the lip plate opening, and the panel vacuum degree are adjusted, and suitable retention aids, spray starch, dyes and other auxiliary materials are used to develop a kind of earth dragon 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

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

[0026] The invention discloses a manufacturing process of explosion-proof original wood pulp texture high-quality kraft paper and kraft paper, which are used to develop a paper surface appearance with tiger skin pattern and wood pulp texture. In terms of usability, the paper has higher strength and more advantages than general 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 scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making 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, the wood pulp includes Russian Koben wood pulp and roll 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 ab grade, 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 part, 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 part, wherein the slurry of the wet paper web is the surface layer slurry, the core layer slurry and the bottom layer slurry in the order from 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 prepared using common raw materials in the prior art. Furthermore, the core layer and the bottom layer of the kraft paper are obtained by the common papermaking method, which is not described in detail in this embodiment.

[0033] In addition, the Russian Koppen pulp, rolled wood pulp, domestic waste ab grade, 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] In the manufacturing process of the high-quality kraft paper with original wood pulp texture of the explosion-proof line of the present embodiment, a wood pulp combination of Russian Koben wood pulp and roll wood pulp mainly with long fibers is adopted as the raw material of the surface layer pulp, and a waste paper combination including domestic waste ab grade, mid-end domestic waste and low-end domestic waste is adopted as the raw material of the core layer pulp and the bottom layer pulp, and a wood pulp beating method with less cutting and heavy decomposition is carried out, the surface layer pulp is sizing at 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 kind of high-quality kraft paper with tiger skin pattern and wood pulp texture on the surface. 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 the present 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 wood pulp of the surface layer pulp includes 80% Russian Koppen pulp and 20% rolled wood pulp, and long-fiber wood pulp fibers are selected as the main materials. The waste paper of the raw materials 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 raw material ratio is only one of the specific implementation methods in this embodiment. This embodiment does not limit the specific ratio of the 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 slurry specifically includes:

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

[0041] b. The crushed raw materials are subjected to disc grinding to obtain surface slurry.

[0042] It should be noted that the above steps can effectively fiberize the raw materials of the facing 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 feed 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, through the above design, the fineness of the surface slurry can be effectively increased, 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: the target mesh section speed is set to 850m / min; the surface layer slurry quantity of the surface layer forming mesh is 20-23gsm; 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 8m / min; the vertical opening of the lip plate of the surface layer forming mesh is 9.4mm; 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 slurry is switched to Percol8038ap with a dosage of 0.38kg / t; the retention aid Perform402L in the surface slurry is not added, and the core slurry and the bottom slurry are added normally; in addition, spray starch is added to the surface core slurry, wherein the starch concentration is 3-4%, so as to ensure the strength of the surface core layer; the second-stage fine screening of the surface slurry is stopped and slag is not discharged, which is expected to save 10t / d of slurry, save costs and reduce the load of sewage treatment.

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

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

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

[0051] It should be noted that, through the above design, it is possible to ensure that the wet paper web is fully squeezed and dehydrated, and avoid the humidity of the dehydrated paper web being too high to prolong the subsequent drying time, thereby increasing 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 limit this, and 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 specifically according to the production process requirements, and this embodiment does not limit this, and designers can adjust this according to actual conditions.

[0056] In addition, in the above-mentioned explosion-proof line original wood pulp texture high-quality kraft paper manufacturing process, it is also necessary to add auxiliary materials to the surface layer pulp, wherein the auxiliary material is specifically anionic styrene acrylic emulsion, and the amount is 0.38kg / t. In addition, the auxiliary materials also include dyes, and the types of dyes can be selected and added according to actual production requirements, which are not described in detail in this embodiment.

[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 papermaking, namely, a surface layer, a core layer and a bottom layer. The raw materials of the surface layer pulp adopt a combination of long-fiber Russian Koppen 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. The wood pulp beating method with less cutting and heavy decomposition is carried out, the surface layer pulp is sizing 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 kind of 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 the explosion-proof original wood pulp texture high-quality kraft paper and the kraft paper 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, the wood pulp includes Russian Koben wood pulp and roll 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 ab grade, 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 part, 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 part, wherein the slurry of the wet paper web is the surface layer slurry, the core layer slurry and the bottom layer slurry in the order from top to bottom; 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.

2. 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 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.

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 the step S1, the preparation of the surface slurry specifically includes: a. Use a stirring knife to break up the raw materials of the surface slurry; b. The crushed raw materials are subjected to disc grinding to obtain surface slurry.

4. The manufacturing process of explosion-proof line original wood pulp texture high-quality kraft paperboard according to claim 3 is characterized in that: In the step a, the raw materials of the surface layer slurry are broken up by a stirring blade to stabilize the feeding and breaking concentration.

5. The manufacturing process of explosion-proof line original wood pulp texture high-quality kraft paperboard according to claim 3 is characterized in that: 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 650-750kw, the reflux is controlled at 10-15% opening, and the beating degree is controlled at 15-18°SR.

6. The manufacturing process of explosion-proof line original wood pulp texture high-quality kraft paperboard according to claim 1 is characterized in that: In the step S2, the specific working parameters of the mesh section are: the target mesh section speed is set to 850m / min; the surface layer slurry quantity of the surface layer forming mesh is 20-23gsm; the surface layer slurry concentration control target of the surface layer forming mesh is 5%; the speed difference between the surface layer slurry and the forming mesh is 8m / min; the vertical opening of the lip of the surface layer forming mesh 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 agent 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.

7. The manufacturing process of explosion-proof line original wood pulp texture high-quality kraft paperboard according to claim 1 is characterized in that: In the 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, and the parameters of the second pressing and dehydration treatment are 950 kN / m.

8. The manufacturing process of explosion-proof line original wood pulp texture high-quality kraft paperboard according to claim 1 is characterized in that: In the 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%.

9. The manufacturing process of explosion-proof line original wood pulp texture high-quality kraft paperboard according to claim 1, 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.

10. A kraft paper, 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 9.

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