company news about [Papermaking machinery] What are the papermaking machinery and equipment Lubrication method of papermaking equipment

[Papermaking machinery] What are the papermaking machinery and equipment Lubrication method of papermaking equipment.

[Papermaking machinery] What are the papermaking machinery and equipment Lubrication method of papermaking equipment

What are the papermaking machinery and equipment

Material preparation equipment

It is the equipment for pretreatment and processing of papermaking raw materials before cooking or refining according to the requirements of the cooking or refining process. It is divided into non-wood fiber preparation equipment and wood fiber preparation equipment. The former includes grass cutters, reed cutters, and sugarcane depidders, while the latter includes peelers and chippers.

The chipper is a machine that cuts the logs required for the production of wood pulp into wood chips of a certain size, which are divided into two types: disc type and drum type. The equipment for fiber is divided into two types: intermittent type and continuous type; wood grinder is the equipment for producing ground wood pulp. There are two types of hydraulic pressurization and mechanical pressurization.

pulping equipment

It is the equipment used in the process of separating plant raw materials into fibers. Pulping methods can be divided into chemical methods, mechanical methods and chemical mechanical methods. The corresponding pulping equipment includes digesters, wood grinders, thermal mills, pulp washers, pulp bleaching machines, pulping machines and waste liquid recovery equipment.

After the wood chips are preheated by steam, the pulp that is ground in a high pressure state is called hot wood chip ground wood pulp. The machine for making hot wood chip ground wood pulp is a thermal mill. Utilizing the heat energy in the refining process is the key problem of the thermal mill; the pulp washer is a mechanical device that separates the cooked pulp from the black liquor. According to the extraction rate of the black liquor, there are two categories of high-concentration and low-concentration extraction.

The purpose of pulp bleaching is to remove the residual lignin and pigment in the pulp after cooking, improve the whiteness of the pulp, and make the pulp have a white color. The pulp bleaching machine is a commonly used bleaching equipment, which is composed of the screw propeller of the pulp bleaching tank, the washing drum and other components. The pulp and bleach are placed in the tank and continuously added to the washing water, and circulated in the tank with the help of the screw propeller to complete the process of mixing and chemical reaction. The water with bleaching products and residual bleach is discharged through the inner cavity of the drum, resulting in a white pulp.

paper machine

It is a complete set of equipment that makes the pulp into the paper web, including the headbox, wire section, press section, drying section, calender, reel, and transmission section. , heat recovery and other auxiliary systems. The wire part that forms the wet paper web is the core of the paper machine, so the paper machine can be divided into fourdrinier wire paper machine, clip wire paper machine and rotary wire paper machine according to the structure of the wire part.

The headbox is a device that uniformly and stably sends the slurry of appropriate concentration to the net through the pulp distributor, rectifier, weir pool, weir plate nozzle and other components, also known as the head box; the slurry is sprayed from the headbox to the copper After the wire, the wet paper sheet is formed on the wire part and dewatered; after that, the pressing, that is, the moisture of the wet paper sheet from the wire part is mechanically squeezed out, the dryness of the paper sheet is improved, and the surface properties of the paper sheet are improved at the same time. , eliminate the net marks and increase the smoothness, tightness and strength; then enter the drying section to further dehydrate the wet paper sheet after pressing, so that the paper sheet shrinks, the fibers are tightly combined and the strength is increased.

After the paper sheet coming out of the drying section is calendered by the calender, the smoothness, gloss and tightness of the paper sheet can be improved, the thickness of the paper sheet can be uniform across the whole width, and the air permeability can be reduced; Rolling into paper rolls completes the main process of papermaking. In order to meet different needs in the future, there are also super calenders, rewinders, paper cutters, etc. after the reel in the paper workshop.

Lubrication method of papermaking equipment

Pulp and paper machinery includes pulp machinery and paper machinery, as well as paper decoration and processing equipment. The specific lubrication methods are as follows:

1. Lubrication of pulp machinery

Pulp machinery includes two types of equipment: material preparation and pulping. The lubrication characteristics of pulp machinery are that the working environment is humid, high temperature, and impact load. Generally, it is required to have good heat resistance, oxidation resistance, anti-emulsification and rust resistance, etc., and an anti-oxidative and anti-rust lubricating oil with a viscosity of 46-100. There are also No. 2 or No. 3 complex calcium-based, sodium-based or lithium-based greases with good heat resistance and mechanical stability, and even molybdenum disulfide or graphite greases. The bearings and gears of pulp cooking equipment have high operating temperatures and are often lubricated with industrial gear oil or grease. Summarize the lubricating parts of pulp machinery include bearings, worm gears, reducers, closed and open gears, L-HL hydraulic oil, L-CkC industrial gear oil, calcium-based grease, complex calcium-based grease, general lithium Types of base grease, graphite calcium base grease and semi-fluid lithium base grease.

2. Lubrication of paper machine

In principle, the lubrication points of paper machines are all closed. Each bearing in the wet section of the paper machine has a sealed bearing housing to prevent cross contamination from intrusion and grease spillage. In the dry section of the paper machine, due to the high temperature during operation, the central lubrication station is used to transport lubricating oil to the bearings everywhere for lubrication and heat dissipation. Summarize the lubricating parts of the paper machine are the transmission reduction box, the worm gear reduction box, the general sliding bearing, the rolling bearing, the exhaust fan, the wet section rolling bearing, the steel wire rope and the oil for the central lubrication station (dry section lubrication). The oils and greases that have been involved include hydraulic oil, total loss system oil, calcium-based grease, sodium-based grease, graphite calcium-based grease and other types.

3. Lubrication of paper machine and its ancillary equipment

(1) Sub-transmission reduction box, oil for central lubrication station (dry section lubrication), shaking box, worm gear reduction box, general sliding bearing:

All use hydraulic oil or L-HL46 or L-AN46 for total loss system oil lubrication. The viscosity of the oil is 41.4~50.6mm2/s at 40°C, the flash point (opening) is >180°C, and the freezing point is <-10°C.

(2) Rolling bearings in wet section:

Calcium-based grease, dropping point>80℃, penetration (25℃, 1/10mm) 265～295.

(3) Exhaust fan, rolling bearings in hot and humid places: sodium-based grease, dropping point>40℃, cone penetration (25℃, 1/10mm) 220～250.

(4) Steel wire rope:

Graphite calcium base grease, ZG-S, dropping point>80℃