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Manufacturing method of shoe cover for shoe press roll

A manufacturing method and a press roll technology, which are applied in the field of paper machine pressing, can solve the problems of insufficient dewatering of press shoe covers, deterioration of surface smoothness, low drainage strength, etc., so as to achieve good water-pressing properties, long service life and both hardness of wet paper. Effect

Active Publication Date: 2016-10-19
JIANGSU JINNI ENGINEERED FABRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing press boots for high-speed paper machines can basically complete the tasks of forming, pressing and dehydrating paper sheets, their disadvantages are that the boots are prone to cracks from the corners of the ends of the grooves during use, and internal Cracks and surface damage, wear, and the tendency to deteriorate the smoothness of the pressed paper and wet paper surface, resulting in insufficient dehydration of the press shoe cover for the paper machine, only low pressure extrusion, low drainage strength, paper The quality is not smooth, not suitable for the production of high-speed paper machine products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method for manufacturing a shoe cover for a shoe-shaped press roll comprises the following steps:

[0023] (1) Clean the surface of the boot cover forming mold, and spray a release agent on the boot cover forming mold;

[0024] (2) Evenly pour the underlying polyurethane (polyurethane) on the boot cover forming mold. The polyurethane is made of QT polyester polyurethane with a pouring thickness of 2mm. While pouring, the flame defoaming method is used to ensure that no bubbles are generated, and the polyurethane is pre-added with Polyurethane defoamer XD-770, the addition ratio is 0.3%wt, QT polyester polyurethane has a Shore hardness of 92-93 and a bending stiffness of 4.6 N / mm 2 , the swelling rate after soaking in tap water at 80 ℃ for 72 hours is 2.4%;

[0025] (3) Before the bottom polyurethane layer is fully cured, straighten the tensile reinforced Kevlar fiber yarn aramid 1414 along the transverse direction of the mold core, and add the yarn along the longit...

Embodiment 2

[0032] The manufacturing method of the shoe cover for this shoe-type press roll, its steps are basically consistent with embodiment 1, and its difference is:

[0033] In step (2), the pouring thickness is 1mm, and the addition ratio of polyurethane special defoamer is 0.1%wt;

[0034] In step (4), the pouring thickness is 1mm, and the addition ratio of polyurethane special defoamer is 0.1%wt;

[0035] In step (7), QVT type polyether polyurethane is used for pouring, and the number of pouring layers for the surface layer of polyurethane layer is 5 layers, and the thickness of each layer is 0.8mm. 0.1%wt of polyurethane special defoamer is added in advance, and the defoamer is XD- 770: Compound formula of DF-8205 / 879 volume ratio of 2:1;

[0036] The depth of the groove in step (8) is 1 mm, and the width is 0.7 mm.

Embodiment 3

[0038] The manufacturing method of the shoe cover for this shoe-type press roll, its steps are basically consistent with embodiment 1, and its difference is:

[0039] In step (2), the pouring thickness is 2.2mm, and the addition ratio of polyurethane special defoamer is 0.5%wt;

[0040] In step (4), the pouring thickness is 1.5mm, and the addition ratio of polyurethane special defoamer is 0.7%wt;

[0041] In step (7), QVT type polyether polyurethane is used for pouring, and the number of pouring layers of the surface polyurethane layer is 2 layers, each layer is 1.2mm thick, and 0.6%wt of polyurethane special defoamer is added in advance, and the defoamer adopts XD- 770: Compound formula of DF-8205 / 879 volume ratio of 1:1;

[0042] The depth of the groove in step (8) is 1.5 mm, and the width is 1.3 mm.

[0043] The boot covers for shoe press rolls obtained in the above three examples are used on the shoe press rolls of high-speed paper machines, and the produced paper is smo...

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Abstract

The invention discloses a method for manufacturing a boot cover for a shoe-shaped press roll. The steps include: spraying a mold release agent on a mould, pouring bottom layer polyurethane, weaving a reinforced Kevlar fiber yarn layer, pouring core layer polyurethane, putting on a core net, Pouring surface polyurethane layer, turning grooves. The boot cover produced by the method of the present invention has reasonable structure, high stability, strong crack resistance, high surface hardness, is not easily damaged, and has a long service life and is suitable for high-speed paper machines. Wet paper has better water squeezing ability, and the produced paper is smooth and stable.

Description

technical field [0001] The invention relates to a method for manufacturing a boot cover for a shoe-shaped press roll of a paper machine, and relates to the field of paper machine pressing. Background technique [0002] The paper machine shoe press roll is an important forming and dewatering equipment in the wet end of the paper machine. The boot cover is a press sleeve, which is specially used for the shoe press roll. Traditional paper machine press rolls have a narrow nip. When the line pressure is increased, the concentrated pressure will easily cause the paper to be crushed, which limits the dehydration of the paper. The large-diameter press roll increases the width of the nip to a certain extent, which can properly increase the line pressure. , but still cannot meet the requirements of high-speed paper machines; in the early 1980s, a wide nip press or delayed press (ENP for short), also known as a shoe press, was introduced. This press has a wide nip (general width It i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/36
CPCB29C70/36
Inventor 陆平周积学盛长新叶平
Owner JIANGSU JINNI ENGINEERED FABRIC CO LTD
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