T paper produced from OCC raw material and production process thereof

Abstract

The invention relates to T paper produced from an OCC raw material and a production process of the T paper. The production process comprises the following steps of pulp preparation, pulp preparation and papermaking with a paper machine. Different from the prior art, according to the technical scheme, the twin-wire paper machine is adopted, dehydration forming is carried out on the wire part and the pressing part of the twin-wire paper machine through the vacuum process, due to the adoption of the vacuum process, the dehydration efficiency of the composite wet paper web is obviously improved, meanwhile, under the action of vacuum suction force, part of OCC fibers are perpendicular to the horizontal direction of the composite wet paper web, and therefore the composite wet paper web is more compact. The thickness of the composite wet paper web is increased, the supporting force in the vertical direction is increased, better hardness can be provided for T paper after forming, and the application range of paperboards produced from OCC raw materials is widened.

Description

Technical Field

[0001] The invention relates to the technical field of pulping and papermaking, and in particular to T paper produced from OCC raw materials and capable of replacing kraft liner paper and a production process thereof. Background Art

[0002] The traditional production process of kraft linerboard is composed of three layers of pulp: surface, core and bottom, and the gram weight is generally 80g / m 2 Among the above, the surface layer is wood pulp and the other two layers are made of domestic waste paper pulp. Due to the high cost of wood pulp, the large-scale use of wood pulp raw materials will damage my country's natural environment and is not conducive to sustainable development.

[0003] Corrugated cardboard first began to be produced in the late 18th century using OCC raw materials. However, due to limitations in raw materials and processes, the quality of corrugated cardboard could not meet the hardness requirements of kraft boxboard. Summary of the invention

[0004] Therefore, it is necessary to provide a production process for T paper produced with OCC raw materials that can meet the hardness requirements of kraft liner board to solve the problem that the corrugated board produced with OCC raw materials has insufficient hardness and limited application range.

[0005] To achieve the above-mentioned purpose, the inventor provides a production process of T paper, comprising the following steps: The applicant provides a production process of T paper, comprising the following steps:

[0006] 1) Slurry preparation:

[0007] OCC pulp preparation: OCC waste paper is used as raw material, and OCC short fibers and OCC long fibers are obtained through crushing, screening, purification, and grading screen screening in sequence;

[0008] OCC short fibers are deslagging and concentrated to obtain OCC short fiber pulp;

[0009] The OCC long fiber is subjected to slag removal, fine screening, concentration, thermal dispersion and disc grinding to obtain OCC long fiber pulp;

[0010] 2) Slurry preparation:

[0011] Surface layer pulping: 40% to 50% OCC short fiber pulp and 50% to 60% OCC long fiber pulp are mixed to obtain surface layer OCC pulp;

[0012] Bottom layer pulping: 55% to 60% OCC short fiber pulp and 40% to 45% OCC long fiber pulp are mixed to obtain bottom layer OCC pulp;

[0013] 3) Paper machine manufacturing:

[0014] Using a web paper machine, the pulp flows through a double-layer headbox into the web section, press section, and dryer section for base papermaking;

[0015] The surface pulp and bottom pulp are vacuum-dehydrated on the wire to form a composite wet paper web;

[0016] The composite wet paper web enters the drying section after vacuum pressing in the pressing section, and is surface sized during the drying process to obtain T-paper base paper;

[0017] The T-paper base paper is calendered, rolled, rewound, wrapped, and packaged for storage.

[0018] Different from the prior art, this technical solution adopts a web-tie paper machine and uses a vacuum process in its web and press parts to perform dehydration and forming. Due to the use of the vacuum process, the dehydration efficiency of the composite wet paper web is significantly improved. At the same time, by controlling the vacuum setting of the equipment, some OCC fibers are perpendicular to the horizontal direction of the composite wet paper web under the action of vacuum suction, so that the thickness of the composite wet paper web is increased, the vertical support force is increased, and after forming, it can also provide better hardness for T paper, which increases the use range of OCC raw materials in the production of paperboard.

[0019] Furthermore, in the pulp preparation step, the OCC long fiber pulp has a beating degree of 25-35°SR and a wet weight of 5-6 g; the OCC short fiber pulp has a beating degree of 25-35°SR and a wet weight of 4-5 g.

[0020] Furthermore, in the slurry preparation step, 5 to 10 wt % of recycled slurry is added to the surface OCC slurry and the bottom OCC slurry.

[0021] Furthermore, in the slurry preparation step, papermaking retention aid, papermaking filter aid, dye, defoamer and bactericide are added to the OCC slurry.

[0022] Furthermore, in the pulping step, the amount of papermaking retention aid is 0.4-0.5 kg / t; the amount of papermaking filter aid is 0.4-0.5 kg / t; the amount of red dye is 0.3-0.5 kg / t; the amount of yellow dye is 2.0-2.5 kg / t; the amount of defoaming agent is 2.0-2.5 kg / t; and the amount of bactericide is 0.04-0.06 kg / t.

[0023] Furthermore, in the papermaking step, the speed of the web paper machine is 1250-1350 m / min.

[0024] Furthermore, in the papermaking step, the surface layer pulp has a concentration of 0.8-1.0% on the web, and the bottom layer pulp has a concentration of 0.8-1.0% on the web.

[0025] Furthermore, in the papermaking steps of the paper machine, the vacuum degrees of various components in the wire section are as follows: the vacuum degree of the vacuum forming roller is -5.5 to -7 kPa, the vacuum degree of the first oblique take-off box of the surface net is -13 to -14 kPa, the vacuum degree of the second oblique take-off box of the surface net is -15 to -17 kPa, the vacuum degree of the bottom net composite vacuum box is -20 to -22 kPa, the vacuum degree of the transfer vacuum dehydration box is -22 to -27 kPa, the vacuum degree of the bottom net flat suction box is: -37 to -39 kPa, and the vacuum degree of the high vacuum dehydration box is -40 to -50 kPa.

[0026] Furthermore, in the papermaking steps of the paper machine, the pressing section adopts a four-roll three-pressing process, and the process parameters are: one press line pressure: 80kn / m, two press line pressure 120kn / m, three press line pressure: 1300kn / m; one press line vacuum: -45~-46kPa; two press line vacuum: -47~-48kPa; three press line vacuum: -49~-51kPa; suction roller: low vacuum zone -44~-46kPa, high vacuum zone -55~-57kPa; pressing roller: low vacuum zone -40~-42kPa, high vacuum zone -62~-65kPa.

[0027] Furthermore, during the gluing process, the gluing machine tension is 200-230 kn / m, the line pressure is 30-32 kn / m, and the glue coating amount on the upper roller is 1.0-1.5 g / m 2 , The amount of glue applied to the lower roller is 0.8~1g / m 2 , starch dosage: 38~42kg / t paper; surface sizing agent dosage: 2~3kg / t paper.

[0028] The present invention also provides a T-paper, which is produced by any of the above production processes.

[0029] Different from the prior art, the T-paper provided by the present invention is made of 100% OCC raw materials, with a gram weight of 60-70g and a hardness higher than that of corrugated paper. It can replace kraft paper to achieve the effect of light weight and high quality. At the same time, the production process of T-paper is simple, and it is a double-layer structure. Compared with the three-layer kraft paper products, the process operation is simpler. The unit power consumption is reduced by 80-120kwh / t paper, and the power consumption is reduced by 15-25%. The overall net section of the paper machine is shortened by about 1 / 3, and the net section occupies less space; the transmission power of the net section is saved by about 2000kw, the length of the bottom net is shortened by about 20 meters, and about 1 20m core layer forming net is saved, and the forming net process line consumption is saved by 1 / 3. The comprehensive production cost is reduced, which has obvious market competitive advantages.

[0030] The above-mentioned records related to the invention content are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the written contents of the specification, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the specific implementation methods of the present application are explained below. DETAILED DESCRIPTION

[0031] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments.

[0032] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description in conjunction with the specific embodiments listed. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0033] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0034] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0035] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0036] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0037] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0038] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0039] The inventor provides a production process of T paper, comprising the following steps:

[0040] 1) Slurry preparation:

[0041] OCC pulp preparation: OCC waste paper is used as raw material, and OCC short fibers and OCC long fibers are obtained through crushing, screening, purification, and grading screen screening in sequence;

[0042] OCC short fibers are deslagging and concentrated to obtain OCC short fiber pulp;

[0043] The OCC long fiber is subjected to slag removal, fine screening, concentration, thermal dispersion and disc grinding to obtain OCC long fiber pulp;

[0044] 2) Slurry preparation:

[0045] Surface layer pulping: 40% to 50% OCC short fiber pulp and 50% to 60% OCC long fiber pulp are mixed to obtain surface layer OCC pulp;

[0046] Bottom layer pulping: 55% to 60% OCC short fiber pulp and 40% to 45% OCC long fiber pulp are mixed to obtain bottom layer OCC pulp;

[0047] 3) Paper machine manufacturing:

[0048] Using a web paper machine, the pulp flows through a double-layer headbox into the web section, press section, and dryer section for base papermaking;

[0049] The surface pulp and bottom pulp are vacuum-dehydrated on the wire to form a composite wet paper web;

[0050] The composite wet paper web enters the drying section after vacuum pressing in the pressing section, and is surface sized during the drying process to obtain T-paper base paper;

[0051] The T-paper base paper is calendered, rolled, rewound, wrapped, and packaged for storage.

[0052] Different from the prior art, this technical solution adopts a clamped paper machine and uses a vacuum process in its wire and pressing parts to perform dehydration and forming. Due to the use of the vacuum process, the dehydration efficiency of the composite wet paper web is significantly improved. At the same time, under the action of vacuum suction, some OCC fibers are perpendicular to the horizontal direction of the composite wet paper web, which increases the thickness of the composite wet paper web and the supporting force in the vertical direction. After forming, it can also provide better hardness for T paper, thereby increasing the use scope of OCC raw materials in producing paperboard.

[0053] Furthermore, OCC waste paper is evenly transported to the pulper for crushing through the chain conveyor, purified by the high-concentration cleaner, screened by the pressure screen, and the pulp is graded and screened into long, short and long fibers, and then thermally dispersed to remove stickies, paraffin and other impurities in the pulp, and the pulp is concentrated by multiple disks to increase the pulp concentration, and then pulped by disk grinding to release the paper.

[0054] Furthermore, the OCC waste paper is waste boxboard.

[0055] Furthermore, in the pulp preparation step, the OCC long fiber pulp has a beating degree of 25-35°SR and a wet weight of 5-6 g; the OCC short fiber pulp has a beating degree of 25-35°SR and a wet weight of 4-5 g.

[0056] Furthermore, in the slurry preparation step, 5-10 wt% of recycled slurry is added to the surface OCC slurry and the bottom OCC slurry. The recycled slurry is the slurry recovered by the white water recovery system (containing more fine fibers and impurities).

[0057] Furthermore, in the slurry preparation step, papermaking retention aid, papermaking filter aid, dye, defoamer and bactericide are added to the OCC slurry.

[0058] The surface and bottom layers of pulp are diluted, degassed, and screened by their respective short circulation systems. The pulp is then evenly mixed with functional additives such as papermaking retention aids, filter aids, dyes, defoamers, bactericides, etc., and sent to the headbox by the pulp pump for forming on the screen.

[0059] Furthermore, in the pulping step, the amount of papermaking retention aid is 0.4-0.5 kg / t; the amount of papermaking filter aid is 0.4-0.5 kg / t; the amount of red dye is 0.3-0.5 kg / t; the amount of yellow dye is 2.0-2.5 kg / t; the amount of defoaming agent is 2.0-2.5 kg / t; and the amount of bactericide is 0.04-0.06 kg / t.

[0060] Furthermore, in the papermaking step, the surface layer pulp has a concentration of 0.8-1.0% on the web, and the bottom layer pulp has a concentration of 0.8-1.0% on the web.

[0061] Furthermore, the web paper machine adopts a double-layer headbox with a surface screen and a bottom screen. There are three floating plates at the front end of the double-layer headbox cavity to separate the surface layer pulp from the bottom layer pulp, and the bottom layer pulp is diluted with dilution water to adjust the quantitative.

[0062] Furthermore, in the papermaking step, the speed of the web paper machine is 1250-1350 m / min.

[0063] Furthermore, in the papermaking steps of the paper machine, the vacuum degrees of various components in the wire section are as follows: the vacuum degree of the vacuum forming roller is -5.5 to -7 kPa, the vacuum degree of the first oblique take-off box of the surface net is -13 to -14 kPa, the vacuum degree of the second oblique take-off box of the surface net is -15 to -17 kPa, the vacuum degree of the bottom net composite vacuum box is -20 to -22 kPa, the vacuum degree of the transfer vacuum dehydration box is -22 to -27 kPa, the vacuum degree of the bottom net flat suction box is: -37 to -39 kPa, and the vacuum degree of the high vacuum dehydration box is -40 to -50 kPa.

[0064] Furthermore, in the papermaking steps of the paper machine, the pressing section adopts a four-roll three-pressing process, and the process parameters are: one press line pressure: 80kn / m, two press line pressure 120kn / m, three press line pressure: 1300kn / m; one press line vacuum: -45~-46kPa; two press line vacuum: -47~-48kPa; three press line vacuum: -49~-51kPa; suction roller: low vacuum zone -44~-46kPa, high vacuum zone -55~-57kPa; pressing roller: low vacuum zone -40~-42kPa, high vacuum zone -62~-65kPa.

[0065] Furthermore, during the gluing process, the gluing machine tension is 200-230 kn / m, the line pressure is 30-32 kn / m, and the glue coating amount on the upper roller is 1.0-1.5 g / m 2 , The amount of glue applied to the lower roller is 0.8~1g / m 2 , starch dosage: 38~42kg / t; surface sizing agent dosage: 2~3kg / t.

[0066] Furthermore, in the drying section, the air permeability of the dryer fabric is 115 CFM. This prevents bubbling when the paper web enters the drying section, and the drying cylinder flutters and forms paper breaks. The unit of fabric air permeability test is CFM (Cubic Feet per Minute), which is cubic feet per minute. This unit represents air permeability, also known as air permeability or air permeability. The higher the CFM value, the better the air permeability of the fabric.

[0067] Furthermore, the drying section includes five groups of drying cylinders and drying nets, and is equipped with a drying net release agent and a drying stripping agent.

[0068] There are fine fibers and adhesives on the surface of the drying cylinder that adhere to the paper web and cause paper breaks. Use dryer web release agent and drying stripping agent to prevent adhesives from adhering to the paper web. Dosage of dryer web release agent: Dosage for the first group of dryer webs: 3-4 ml / min; Dosage for the second group of dryer webs: 1.5-2.0 ml / min; Dosage for the third group of dryer webs: 1.5-2.0 ml / min; Dosage for the fourth group of dryer webs: 1.5-2.0 ml / min; Dosage for the fifth group of dryer webs: 1.5-2.0 ml / min. Dosage of drying cylinder stripping agent: Dosage for the first group of cylinders: 5.0-5.5 ml / min; Dosage for the second group of cylinders: 2.5-3.0 ml / min; Dosage for the fifth group of cylinders: 1.5-2.0 ml / min.

[0069] Papermaking dryer fabric refers to the part of the paper machine dryer that is composed of the entire cylinder surface and is used to evaporate the water on the wet paper. In the papermaking process, the wet paper must be transferred to the drying section through the dryer fabric. If the friction between the paper and the dryer fabric is too large, it is easy to cause quality problems such as paper damage and wrinkling. The main component of the dryer fabric release agent is silane compounds. After being added in the papermaking process, these compounds will form tiny particles in the pulp. They are electrostatically adsorbed or adsorbed on the surface of fibers and fiber bundles to form a protective film, isolating the direct contact between the paper and the dryer fabric, thereby reducing the friction coefficient and improving the quality of paper transmission and printing quality of the paper machine.

[0070] The present invention also provides a T-paper, which is produced by any of the above production processes.

[0071] Different from the existing technology, the T paper of this technical solution is made of 100% OCC raw materials, with a gram weight of 60-70g, a higher hardness than corrugated paper, and can replace kraft paper. At the same time, the production process of T paper is simple, with a double-layer structure. Compared with the three-layer kraft paper products, the unit power consumption is reduced by 80-120kwh / t paper, and the power consumption is reduced by 15-25%. The overall net part of the paper machine is shortened by about 1 / 3, and the net part occupies less space; the transmission power of the net part is saved by about 2000kw, the length of the bottom net is shortened by about 20 meters, and about 1 core layer forming net of about 20m is saved. The consumption of forming net process spare parts is saved by 1 / 3, and the comprehensive production cost is reduced, which has obvious market competitive advantages.

[0072] Example 1

[0073] 1) Slurry preparation:

[0074] OCC pulp preparation: OCC waste boxboard is used as raw material, which is evenly transported to the pulper for crushing through the chain conveyor, purified by the high-concentration cleaner, screened by the pressure screen, and the pulp is classified into long, short and long fibers through thermal dispersion to remove adhesives, paraffin and other impurities in the pulp, multi-disc concentration to increase the pulp concentration, and disc grinding to obtain OCC short fibers and OCC long fibers;

[0075] OCC short fibers are deslagging and concentrated to obtain OCC short fiber pulp;

[0076] The OCC long fiber is subjected to slag removal, fine screening, concentration, thermal dispersion and disc grinding to obtain OCC long fiber pulp;

[0077] The OCC long fiber pulp has a beating degree of 25-35°SR and a wet weight of 5-6g; the OCC short fiber pulp has a beating degree of 25-35°SR and a wet weight of 4-5g

[0078] 2) Slurry preparation: sizing flow rate of surface layer: 6000-7500L / min, short fiber volume of surface layer: 2400-3750L / min, long fiber volume: 3000-4500L / min; sizing flow rate of bottom layer: 8000-9000L / min; short fiber volume of surface layer: 4400-5400L / min, long fiber volume: 3200-4050L / min;

[0079] Surface layer pulping: 40% to 50% OCC short fiber pulp and 50% to 60% OCC long fiber pulp are mixed to obtain surface layer OCC pulp;

[0080] Bottom layer pulping: 55% to 60% OCC short fiber pulp and 40% to 45% OCC long fiber pulp are mixed to obtain bottom layer OCC pulp;

[0081] 5-10 wt% of recycled pulp is added to the surface OCC pulp and the bottom OCC pulp, and then papermaking retention aid, papermaking filter aid, dye, defoamer, bactericide are added. The surface and bottom slurries are diluted, degassed, and screened by a pre-net screen through their respective short circulation systems. The slurries are then evenly mixed with functional additives such as papermaking retention aid, filter aid, dye, defoamer, bactericide, etc., and sent to the headbox by a slurry pump for net forming.

[0082] The dosage of papermaking retention aid: 0.4~0.5kg / t; the dosage of papermaking filter aid: 0.4~0.5kg / t; the dosage of red dye: 0.3~0.5kg / t; the dosage of yellow dye: 2.0~2.5kg / t; the dosage of defoaming agent: 2.0~2.5kg / t; the dosage of bactericide: 0.04~0.06kg / t.

[0083] 3) Paper machine manufacturing:

[0084] A web-tie paper machine is used, and the pulp flows into the web section, the pressing section and the drying section through a double-layer headbox for base papermaking; the speed of the web-tie paper machine is 1250-1350 m / min.

[0085] There are three floating plates at the front end of the double-layer headbox cavity to separate the surface slurry from the bottom slurry. The bottom slurry is diluted with dilution water to adjust the quantity. The surface slurry concentration is 0.8-1.0%, and the bottom slurry concentration is 0.8-1.0%.

[0086] The surface layer pulp and the bottom layer pulp are vacuum-dehydrated in the wire section to form a composite wet paper web; the vacuum degrees of the various components in the wire section are as follows: the vacuum degree of the vacuum forming roller is -5.5 to -7 kPa, the vacuum degree of the first oblique dehydration box of the surface wire is -13 to -14 kPa, the vacuum degree of the second oblique dehydration box of the surface wire is -15 to -17 kPa, the vacuum degree of the bottom wire composite vacuum box is -20 to -22 kPa, the vacuum degree of the transfer vacuum dehydration box is -22 to -27 kPa, the vacuum degree of the bottom wire flat suction box is: -37 to -39 kPa, and the vacuum degree of the high vacuum dehydration box is -40 to -50 kPa.

[0087] The composite wet paper web enters the press section for vacuum pressing. The press section adopts a four-roll three-press process, which consists of a paper drawing felt cloth, a first pressing felt cloth, and a third pressing felt cloth. The wet paper web passes through the felt cloth pressing area, and the moisture content of the paper web is taken out through the felt cloth. The main process parameters are: first press line pressure: 80kn / m, second press line pressure 120kn / m, third press line pressure: 1300kn / m; first press line vacuum: -45~-46kpa; second press line vacuum: -47~-48kpa; third press line vacuum: -49~-51kpa; suction roller: low vacuum area -44~-46kpa, high vacuum area -55~-57kpa; press roller: low vacuum area -40~-42kpa, high vacuum area -62~-65kpa.

[0088] After compounding the wet paper web, it enters the pre-drying section, sizing section and post-drying section.

[0089] In the front drying section, there are five groups of drying cylinders and drying nets. The air permeability of the drying net is 115CFM, and it is equipped with drying net release agent and drying stripping agent. The amount of drying net release agent: the first group of drying nets: 3-4ml / min; the second group of drying nets: 1.5-2.0ml / min; the third group of drying nets: 1.5-2.0ml / min; the fourth group of drying nets: 1.5-2.0ml / min; the fifth group of drying nets: 1.5-2.0ml / min. The amount of drying cylinder stripping agent: the first group of cylinders: 5.0-5.5ml / min; the second group of cylinders: 2.5-3.0ml / min; the fifth group of cylinders: 1.5-2.0ml / min.

[0090] Apply glue on the surface, the glue machine tension is 200-230kn / m, the line pressure is 30-32kn / m, and the glue coating amount on the upper roller is 1.0-1.5g / m 2 , The amount of glue applied to the lower roller is 0.8~1g / m 2 , starch dosage: 38~42kg / t; surface sizing agent dosage: 2~3kg / t.

[0091] After drying in the post-drying section, the T-paper base paper is obtained, which is then calendered, rolled, rewound, wrapped, and packaged for storage.

[0092] The T paper prepared in the embodiment is made of 100% OCC raw material, with a gram weight of 60-70g and a hardness higher than that of corrugated paper. It can replace kraft paper to achieve the effect of light weight and high quality. At the same time, the production process of T paper is simple, and it is a double-layer structure. Compared with the three-layer kraft paper products, the process operation is simpler. The unit power consumption is reduced by 80-120kwh / t paper, and the power consumption is reduced by 15-25%. The overall net part of the paper machine is shortened by about 1 / 3, and the net part occupies less space; the transmission power of the net part is saved by about 2000kw, the length of the bottom net is shortened by about 20 meters, and about 1 20m core layer forming net is saved, and the forming net process line consumption is saved by 1 / 3. The comprehensive production cost is reduced, which has obvious market competitive advantages.

[0093] Finally, it should be noted that although the above embodiments have been described in the text of the specification of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the text of the specification of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A production process for T paper produced from OCC raw materials, characterized in that: The following steps are involved: 1) Slurry preparation: OCC pulp preparation: OCC waste paper is used as raw material, and OCC short fibers and OCC long fibers are obtained through crushing, screening, purification, and grading screen screening in sequence; OCC short fibers are deslagging and concentrated to obtain OCC short fiber pulp; The OCC long fiber is subjected to slag removal, fine screening, concentration, thermal dispersion and disc grinding to obtain OCC long fiber pulp; 2) Slurry preparation: Surface layer pulping: 40% to 50% OCC short fiber pulp and 50% to 60% OCC long fiber pulp are mixed to obtain surface layer OCC pulp; Bottom layer pulping: 55% to 60% OCC short fiber pulp and 40% to 45% OCC long fiber pulp are mixed to obtain bottom layer OCC pulp; 3) Paper machine manufacturing: Using a web paper machine, the pulp flows through a double-layer headbox into the web section, press section, and dryer section for base papermaking; The surface pulp and bottom pulp are vacuum-dehydrated on the wire to form a composite wet paper web; The composite wet paper web enters the drying section after vacuum pressing in the pressing section, and is surface sized during the drying process to obtain T-paper base paper; The T-paper base paper is calendered, rolled, rewound, wrapped, and packaged for storage.

2. The production process according to claim 1, characterized in that: In the pulp preparation step, the OCC long fiber pulp has a beating degree of 25-35°SR and a wet weight of 5-6g; the OCC short fiber pulp has a beating degree of 25-35°SR and a wet weight of 4-5g.

3. The production process according to claim 1, characterized in that: In the slurry preparation step, 5-10 wt% of recycled slurry is added to the surface OCC slurry and the bottom OCC slurry.

4. The production process according to claim 1, characterized in that: In the pulp preparation step, papermaking retention aid, papermaking filter aid, dye, defoamer and bactericide are added to the OCC pulp.

5. The production process according to claim 1, characterized in that: In the papermaking step, the speed of the web paper machine is 1250-1350 m / min.

6. The production process according to claim 1, characterized in that: In the papermaking step, the surface layer pulp has a concentration of: 0.8~1.0%, the bottom slurry concentration on the screen is 0.8~1.0%.

7. The production process according to claim 1, characterized in that: In the papermaking steps of the paper machine, the vacuum degree of each component in the wire section is as follows: the vacuum degree of the vacuum forming roller is -5.5 to -7 kPa, the vacuum degree of the first oblique dewatering box of the surface wire is -13 to -14 kPa, the vacuum degree of the second oblique dewatering box of the surface wire is -15 to -17 kPa, the vacuum degree of the bottom wire composite vacuum box is -20 to -22 kPa, the vacuum degree of the transfer vacuum dehydration box is -22 to -27 kPa, the vacuum degree of the bottom wire flat suction box is: -37 to -39 kPa, and the vacuum degree of the high vacuum dehydration box is -40 to -50 kPa.

8. The production process according to claim 1, characterized in that: The papermaking steps of the paper machine are as follows: the pressing part adopts a four-roll three-pressing process, and the main process parameters are: one press line pressure: 80kn / m, the second press line pressure 120kn / m, the third press line pressure: 1300kn / m; one press line vacuum: -45~-46kPa; two press line vacuum: -47~-48kPa; three press line vacuum: -49~-51kPa; suction roller: low vacuum area -44~-46kPa, high vacuum area -55~-57kPa; pressing roller: low vacuum area -40~-42kPa, high vacuum area -62~-65kPa.

9. The production process according to claim 1, characterized in that: During the gluing process, the gluing machine has a tension of 200-230 kn / m, a line pressure of 30-32 kn / m, and a glue coating amount of 1.0-1.5 g / m 2 , The amount of glue applied to the lower roller is 0.8~1g / m 2 , starch dosage: 38~42kg / t paper; surface sizing agent dosage: 2~3kg / t paper.

10. A T-paper, characterized in that: The T paper is produced by using the production process described in any one of claims 1 to 9.