[Case] The second set of boot pressure of the big finger equipment ran successfully!

Release time：

2018-01-16

Jianghe Paper PM2 is a 3200mm/1000 m/min special cultural paper machine. The press section adopts the traditional 3-roll 2-nip composite press plus one positive press. The press dryness is 46% higher, and the press has many broken ends and low operation efficiency, which limits the production capacity of the machine.

After many investigations, the big finger equipment decided to change the pressing department to a compound pressing with shoe pressing, and undertook this technological transformation project.

Existing problems:

The higher dryness of the web out of the press section, 46%, has reached the dewatering limit of this dynamic instantaneous press. In the production process, in order to make the paper web to obtain a larger degree of dryness, only through a large line pressure to complete, which is bound to cause the loss of some physical indicators of paper (such as paper loose thickness) and equipment wear, limiting the quality and diversity of paper, increasing the cost of equipment operation and maintenance;

The wet strength of the paper web is not high from the second pressure to the third pressure, and the open interval is long. With the change of process and speed, the paper breaks frequently here, which greatly limits the speed-up space and operating efficiency of the paper machine;

There is only one paper loss pool in the press section, and the wet paper web peeled off by the scraper in the three pressure zones must be cleaned manually, which poses a great potential safety hazard to the production and equipment and increases the workload of the operators.

Renovation scheme:

In order to solve the above problems, after discussion and research with customers, Big Finger Equipment designed a composite 3-roller 2-nip with shoe rollers to replace the original 3-roller 2-nip composite positive pressure structure.

河南大指造纸装备集成工程有限公司

Before transformation

河南大指造纸装备集成工程有限公司

After the transformation

Advantages:

The shoe press replaces the instantaneous dynamic linear dehydration of the original roller press with the long-time wide-nip dehydration under static pressure, with high pressure and low pressure in the pressure line;

After the transformation, the structure of the press section is more compact, and the operation efficiency is greatly improved;

The number of press blankets is reduced from 3 to 2, and the matching tension, correction, transmission, vacuum box and cleaning mechanism are reduced, which greatly reduces the cost of equipment operation, management and maintenance;

The drive points, power configuration and drive control system in the press section have been made more compact, as shown in the figure below.

Transfer points before transformation	Motor power (Kw)	Transmission point after transformation	Motor power (Kw)
vacuum suction roll	45	vacuum suction roll	45
vacuum press roll	250	vacuum press roll	250
One grooving roller	132	Center roll	355
Two stone roller	132
paper guide roller	18
Under positive pressure groove roller	200