Production method for making high-grade cardboard using brush wood sheet hot grinding pulp to replace OCC (obsolescence corrugated cardboard) pulp

[0042] Example one

[0043] The present invention is a production method for preparing high-grade paperboard with hot refining of branches and wood chips instead of OCC pulp, including the following steps:

[0044] Preparation:

[0045] Using waste cardboard paper as raw material, OCC slurry is prepared through conventional OCC pulping line feeding, disintegration, slag removal, screening, concentration, refined pulp, and pulp storage processes;

[0046] Using waste newspapers as raw materials, ONP slurry is prepared through ONP slurry line feeding, disintegration, slag removal, screening, concentration, thermal dispersion, slurry storage and other processes;

[0047] Using twig wood chips as raw materials, the wood chip pulp is fed through the wood chip pulp preparation line, wood chip heat milling, refined pulp, screening, concentration, and pulp storage processes to prepare wood chip slurry. The wood chip slurry, Xuewa yeast and binder are proportioned by weight 100:1:20 to form a mixture, and culture under the following conditions: temperature 30°C, time 10 days, the binder is carboxymethyl cellulose, sodium carboxymethyl cellulose, sodium carboxymethyl starch or A kind of starch;

[0048] Branch wood chips refer to the wood chips cut from the branches and branches of trees other than the main trunk. These materials generally cannot be cut into solid wood panels for reasons of diameter and structure, but are used for medium density fiberboard and particleboard. And other materials for wood-based panels.

[0049] Further, in the step of preparing the pulp, when the twig wood chips are used as raw materials, the twig wood chips are pre-impregnated first, and the content of 8% Na 2 SO 3 Pre-soaked in 0.5% NaOH solution for 24 hours. Removal of lignin and dehydration of twig wood chips.

[0050] Specifically, the wood chip slurry, the S. edulis and the binder are mixed in a weight ratio of 100:1:20 to form a mixture and cultured. During the cultivation process, the S. serrata grows and affects the fiber in the sawdust pulp. Fermentation of substances such as vitamins, pectins and terpenes produces oxidation, degradation, decomposition and cracking reactions, thereby modifying the surface chemical properties and pore structure of wood chip pulp, which is conducive to the chemical adsorption performance and physical adsorption of the adsorbent Synchronous improvement of performance. The adsorption of wood chip slurry is strengthened, and the tightness of the produced gray paperboard is increased without affecting its thickness and stiffness. While ensuring the stability of its ash content, it can achieve high thickness, tightness and stiffness.

[0051] In the pulp preparation step, wood chips of twig wood are used as raw materials, and wood chip pulp is prepared through the process of wood chip pulp preparation line feeding, wood chip thermal grinding, refined pulp, screening, concentration, and pulp storage, which is specifically:

[0052] Wood chip transportation: the wood chips from the silo are sent to the swing screen through a double screw conveyor and a belt conveyor;

[0053] Wood chip removal: The wood chips are screened by a swing screen to remove bark and large wood blocks, and the screened wood chips are sent to the wood chip preheating bin by a bucket elevator;

[0054] Wood chip preheating: steam into the wood chip preheating chamber to soften the wood chips, and then send the wood chips to the wood chip cooking chamber;

[0055] Wood chip steam cooking: high pressure steam is introduced into the wood chip cooking chamber to increase the moisture of the wood and soften the wood chips again;

[0056] Wood chip heat milling: After the wood chips are cooked in the cooking chamber, they are fed into the heat mill through the feeding screw, and the heat mill grinds the wood chips into single fibers;

[0057] Hot refining dilution: the wood chip pulp mixture after hot grinding is adjusted by the dilution screw to adjust the concentration, and then sent to the diving pool;

[0058] Thermal refining to eliminate potential: After the wood chip pulp is eliminated, it is concentrated and sent to the disc mill for refined pulp;

[0059] Disc refining: use double disc refining to refine hot refining, cutting and dissociating fibers to meet the requirements of pulping;

[0060] Fine screening: the slurry at the outlet of the double-disc mill is diluted and thickened, and then sent to the fine screening of wood chip pulp for screening;

[0061] Concentration: Sawdust is finely sieved through a slanted sieve and concentrated to obtain sawdust slurry.

[0062] Blending:

[0063] After the ONP slurry is concentrated by the surface mixing tank and the surface copying pool, it is sent to the surface layer flow section for dilution, screening before the net, and the surface layer headbox is used to distribute the pulp to the Internet as a gray board paper surface layer;

[0064] The OCC slurry and sawdust pulp mixture is sent to the lining mixing tank and the pre-printing tank at a weight ratio of 1:1 for mixing and concentration. After the mixing and concentration, the slurry is sent to the lining flow section for dilution, screening before the net, and paper removal The machine lining headbox is used as the lining of the gray board paper.

[0065] The OCC slurry and sawdust pulp mixture is sent to the core mixing tank and the pre-printing tank at a weight ratio of 1:1 for mixing and concentration. After the mixing and concentration, the slurry is sent to the core flow section for dilution, screening before the net, and paper removal The machine lining headbox is used to distribute the pulp to the grid as the core layer of the gray board;

[0066] The OCC pulp and wood chip pulp mixture is sent to the bottom mixing tank and the front pool at a weight ratio of 1:1 for mixing and concentration. After the mixing and concentration, the slurry is sent to the bottom flow section for dilution, screening before the net, and removing the paper machine lining. Laminar headbox is used to distribute pulp on the Internet as the bottom layer of gray board paper;

[0067] Copy:

[0068] The above-mentioned net-on-grid slurry is formed into paper after being dehydrated and formed by the wire part, the surface lining core bottom is compounded, the pressing part is squeezed and dewatered, and the drying part is dried.

[0069] In this embodiment, through key process development and equipment improvement, wood chip pulp with fiber length and thickness meeting production requirements is prepared. The prepared wood chip pulp replaces part of the OCC pulp, and the paper feeder is equipped with high-grade cardboard. By adjusting the amount of wood chip pulp, the thickness of the gray board paper can be adjusted in time to ensure that the thickness of the gray board paper is qualified and stable; the stiffness of the gray board paper produced with wood chip pulp increases, and the usability of the product is improved. This embodiment improves the grade and use performance of the product; optimizes the raw material structure of the gray board, reduces the amount of OCC waste paper, and can increase the ash content of the paper by adding filling, effectively solving the problem of reducing the cost of gray board paper raw materials; this embodiment expands The comprehensive utilization method of eucalyptus and mixed wood resources can digest and value-added use of eucalyptus and mixed wood resources, with significant environmental and economic benefits. In this embodiment, the wood chip slurry is cultured with microorganisms, thereby modifying the surface chemical properties and pore structure of the wood chip slurry, which is beneficial to the simultaneous improvement of the chemical adsorption performance and the physical adsorption performance of the wood chip slurry adsorbent.

[0070] Example two

[0071] The difference between the second embodiment and the first embodiment is:

[0072] Preparation:

[0073] Using twig wood chips as raw materials, the wood chip slurry is prepared through the wood chip pulp preparation line feeding, wood chip thermal grinding, refined pulp, screening, concentration, and pulp storage processes to prepare wood chip slurry. The wood chip slurry, Xuewa yeast and binder are proportioned by weight 100:1:20 to form a mixture, and culture under the following conditions: temperature 40°C, time 6 days, the binder is carboxymethyl cellulose, sodium carboxymethyl cellulose, sodium carboxymethyl starch or A kind of starch;

[0074] Blending:

[0075] After the ONP slurry is concentrated by the surface mixing tank and the surface copying pool, it is sent to the surface layer flow section for dilution, screening before the net, and the surface layer headbox is used to distribute the pulp to the Internet as a gray board paper surface layer;

[0076] The OCC slurry and sawdust slurry mixture is sent to the lining mixing tank and the pre-printing tank at a weight ratio of 1:1.2 for mixing and concentration. After the mixing and concentration, the slurry is sent to the lining flow section for dilution, screening before the net, and paper removal The machine lining headbox is used as the lining of the gray board paper.

[0077] The OCC slurry and sawdust slurry mixture is sent to the core mixing tank and the pre-printing tank in a weight ratio of 1:1.2 for mixing and concentration. After the mixing and concentration, the slurry is sent to the core flow section for dilution, screening before the net, and paper removal The machine lining headbox is used to distribute the pulp to the grid as the core layer of the gray board;

[0078] The OCC pulp and wood chip pulp mixture is sent to the bottom mixing tank and the pre-printing tank at a weight ratio of 1:1.2 for mixing and concentration. After the mixing and concentration, the slurry is sent to the bottom flow section for dilution, screening before the net, and removing the lining of the paper machine Laminar headbox is used to distribute pulp on the Internet as the bottom layer of gray board paper;

[0079] In this embodiment, the wood chip slurry is cultured with microorganisms, thereby modifying the surface chemical properties and pore structure of the wood chip slurry, which is beneficial to the simultaneous improvement of the chemical adsorption performance and the physical adsorption performance of the wood chip slurry adsorbent.

[0080] Example three

[0081] The difference between the third embodiment and the first embodiment is:

[0082] Preparation:

[0083] Using twig wood chips as raw materials, the wood chip slurry is prepared through the wood chip pulp preparation line feeding, wood chip thermal grinding, refined pulp, screening, concentration, and pulp storage processes to prepare wood chip slurry. The wood chip slurry, Xuewa yeast and binder are proportioned by weight 100:1:20 to form a mixture, culture under the following conditions: temperature 50°C, time 10 days, the binder is carboxymethyl cellulose, sodium carboxymethyl cellulose, sodium carboxymethyl starch or A kind of starch;

[0084] Blending:

[0085] After the ONP slurry is concentrated by the surface mixing tank and the surface copying pool, it is sent to the surface layer flow section for dilution, screening before the net, and the surface layer headbox is used to distribute the pulp to the Internet as a gray board paper surface layer;

[0086] The OCC slurry and sawdust slurry mixture is sent to the lining mixing tank and the pre-scribing tank at a weight ratio of 1:1.5 for mixing and concentration. After the mixing and concentration, the slurry is sent to the lining flow section for dilution, screening before the net, and paper removal The machine lining headbox is used as the lining of the gray board paper.

[0087] The OCC slurry and sawdust slurry mixture is sent to the core mixing tank and the pre-printing tank at a weight ratio of 1:1.5 for mixing and concentration. After the mixing and concentration, the slurry is sent to the core flow section for dilution, screening before the net, and paper removal The machine lining headbox is used to distribute the pulp to the grid as the core layer of the gray board;

[0088] The OCC pulp and wood chip pulp mixture is sent to the bottom mixing tank and the front pool at a weight ratio of 1:1.5 for mixing and concentration. After the mixing and concentration, the slurry is sent to the bottom flow section for dilution, screening before the net, and removing the lining of the paper machine Laminar headbox is used to distribute pulp on the Internet as the bottom layer of gray board paper;

[0089] In this embodiment, the wood chip slurry is cultured with microorganisms, thereby modifying the surface chemical properties and pore structure of the wood chip slurry, which is beneficial to the simultaneous improvement of the chemical adsorption performance and the physical adsorption performance of the wood chip slurry adsorbent.