CN101781868B

CN101781868B - Hot-pressing production process of standard paperboard

Info

Publication number: CN101781868B
Application number: CN2009100443827A
Authority: CN
Inventors: 龚龑
Original assignee: Hunan Guangxin Electrical Technology Co Ltd
Current assignee: HUNAN GUANGXIN ELECTRICAL TECHNOLOGY CO., LTD.
Priority date: 2009-09-21
Filing date: 2009-09-21
Publication date: 2012-08-22
Anticipated expiration: 2029-09-21
Also published as: CN101781868A

Abstract

The invention relates to a hot-pressing production process of a standard paperboard, belonging to the technical field of papermaking process and aiming to produce the standard paperboard through adopting the new hot-pressing production process. The hot-pressing production process comprises the following steps of: molding wood pulp into a wet paper blank in a molding cylinder after smashing, concentrating, grinding and stabilizing; then pressurizing and drying the wet paper blank in a hot press to form a semi-finished product; and finally, curing, calendaring and cutting, and packaging and warehousing a finished product qualified through inspection. The paperboard produced by adopting the hot-pressing process has uniform thickness, small homogeneous difference, uniform moisture and enhancement of processing precision. Meanwhile, the hot-pressing production process has high mechanical degree, can reduce production links and relieve labor intensity and has high finished product rate to reduce the recycling and consumption of waste products and save energy.

Description

The hot-pressing production process of standard paperboard

Technical field

The present invention relates to the production technology of standard paperboard, belong to the paper-making technology field.

Background technology

Standard paperboard is mainly used in war products, supplies the usefulness of the packing of accurate special moulded product of making and important goods, and required thickness is consistent, paper is smooth, moisture is even, has certain percentage elongation and mechanical strength.At present standard paperboard adopts the cold-press method explained hereafter, with a certain proportion of raw material of wood pulp, through shredded paper, the operation manufacturings such as moulding, setting-out, box-type drying, press polish of pulling an oar, manufacture paper with pulp form.The cal(l)iper that cold-press method is produced is unstable, and is big with the version difference, non-uniform moisture, and the out-of-flatness of paper warpage, labor strength is big, and yield rate is low.

Summary of the invention

The objective of the invention is to adopt new hot-pressing production process production standard cardboard.

The objective of the invention is to realize like this: the wood pulp pulping, dehydration is concentrated into stock tank, wears into the desired beating degree of product technology with being pumped to two disks: 38 ± 2 ° of SR; Weight in wet base 12 ± 2g, the paper pulp that mill is good is diluted to 2.0 ± 0.5% concentration through regulating box, after desander desanding, selectifier slagging-off, gets into high-order slurry-stablizing case; Be diluted to 0.23 ± 0.05% paper pulp again, flow into cylinder and form the l Water Paper embryo, stick to and be passed to the moulding cylinder on the woollen blanket; Lean on the extruding of moulding cylinder and carrying roller that the l Water Paper embryo is dewatered to moisture 71%, the paper embryo after the dehydration is circumference operation progressive additive on the moulding cylinder, under the quantitative stable status of individual layer; Control the thickness of cardboard with the number of plies of page, when the moulding cylinder l Water Paper number of plies reached predetermined quantity, thickness meter indicator lamp was bright; The artificial l Water Paper embryo that cuts off gets into the wet plate transporter, with flying saw the l Water Paper embryo is cut into given size; Deliver on the backing plate that is lined with the metal twine, get into charger one by one, send into hot press after filling 15 layers successively again and carry out high pressure-temperature and dehydrate; Hot press pressure is that hydraulic system provides, and thermal source is a high steam.Moulding pressure I section 8～12MPa, II section 5～7MPa, 140～150 ℃ of baking temperatures are according to the different pressurization of thickness I section 60～400s drying time, II section 240～2200s.When dehydrate reach setting-up time after; The press automatically unloading unloads plate through unloader; Check thickness, outward appearance and following machine moisture then, following machine moisture Control is 3～5%, and qualified semi-finished product get into humidifier (humidification to moisture content of finished products 10～12%); Health, press polish again, cut finished product packing warehouse-in after the assay was approved.

Advantage of the present invention is:

1, the cal(l)iper of heat pressing process production is even, and is little with the version difference; Moisture is even, the raising of processing precise property.

2, the hot-pressing production process mechanization degree is higher, can simplify production link, reduces labor intensity; Yield rate is high, reduces the waste product reuse and consumes energy savings.

Description of drawings

Fig. 1 is a standard paperboard hot-pressing production process flow chart.

The specific embodiment

Embodiment 1 and 2, the data of bracket are not embodiment 1, the data in the bracket are embodiment's 2.

Wood pulp 1 size degradation is become pulping 2, after slanted screen concentrates 3, get into defibrination 4,36 (40) ° of SR of beating degree, weight in wet base 10 (14) g.Paper pulp gets into slurry-stablizing case 8 and flows to cylinder 9 after regulating box 5 is regulated starching amounts and concentration, desander desanding 6, selectifier 7 slagging-off, and formation l Water Paper page or leaf sticks to and is transported to moulding cylinder 11 on the woollen blanket 10; The l Water Paper embryo is circumference operation and carrying roller 12 extrusion dehydrations to moisture 71 (75) % on the moulding cylinder, and when moulding cylinder l Water Paper level reached predetermined number of layers, thickness meter 13 indicator lamps were bright; The artificial l Water Paper embryo that cuts off; Be transferred to wet plate transportation felt 14, utilization flies to saw 15 and is cut into preliminary dimension, delivers on the backing plate 16 that the metal twine is housed; Get into charger 17 one by one; Send hot press 18 high humidity high pressure to dehydrate after filling 15 layers, hot press pressure is provided by hydraulic system 19, and thermal source 20 is a high steam.Hot press moulding pressure I section 8～12MPa, II section 5～7MPa, 140 (150) ℃ of humidity; According to thickness different pressing time of I section 60 (400) s, II section 240 (2200) s are when reaching setting-up time press automatically unloading; Draw in unloader 21 and unload plate one by one, machine moisture 3 (5) % under the inspection of semifinished product 22 thickness, outward appearance and mensuration get into humidifier 23 humidifications to moisture content of finished products 10 (12) %; Through health 24 balancing water, cut edge again, cut into given size through the laggard bead cutter 26 of calender 25 press polish; After finished product inspection 27, qualified products packing 28 warehouse-ins 29.

Claims

1. the hot-pressing production process of standard paperboard is characterized in that: 1, with the wood pulp pulping, dehydration is concentrated into stock tank, wears into the desired beating degree of product technology with being pumped to pair disks: 38 ± 2 ° of SR, weight in wet base 12 ± 2g; 2, will grind good paper pulp and be diluted to 2.0 ± 0.5% concentration, after desander desanding, selectifier slagging-off, get into high-order slurry-stablizing case, be diluted to 0.23 ± 0.05% paper pulp again through regulating box; 3, the paper pulp that dilution is good flows into cylinder and forms the l Water Paper embryo; Stick to and be passed to the moulding cylinder on the woollen blanket, lean on the extruding of moulding cylinder and carrying roller that the l Water Paper embryo is dewatered to moisture 71%, the paper embryo after the dehydration is circumference operation progressive additive on the moulding cylinder; Under the quantitative stable status of individual layer; Control the thickness of cardboard with the number of plies of page, when the moulding cylinder l Water Paper number of plies reached predetermined quantity, thickness meter indicator lamp was bright; 4, the artificial l Water Paper embryo that cuts off gets into the wet plate transporter, with flying to saw the l Water Paper embryo is cut into given size, delivers on the backing plate that is lined with the metal twine, gets into charger one by one, sends into hot press after filling 15 layers successively again and carries out high pressure-temperature and dehydrate; 5, hot press pressure is that hydraulic system provides, and thermal source is a high steam, moulding pressure I section 8～12MPa, and II section 5～7MPa, 140～150 ℃ of baking temperatures are according to the different pressurization of thickness I section 60～400s drying time, II section 240～2200s; 6, when dehydrate reach setting-up time after; The press automatically unloading unloads plate through unloader, checks thickness, outward appearance and following machine moisture then, and following machine moisture Control is 3～5%; Qualified semi-finished product get into humidifier; Humidification to moisture content of finished products 10～12%, cuts at health, press polish again, finished product packing warehouse-in after the assay was approved.