Efficient vacuum degasser

A vacuum deaerator and high-efficiency technology, applied in textile and papermaking, fiber raw material processing and other directions, can solve the problems of difficult separation of paint and air bubbles, easy bubble rupture, high specific gravity of paint, stable deaeration effect, long residence time, The effect of dwell time

A vacuum deaerator and high-efficiency technology, applied in textile and papermaking, fiber raw material processing and other directions, can solve the problems of difficult separation of paint and air bubbles, easy bubble rupture, high specific gravity of paint, stable deaeration effect, long residence time, The effect of dwell time

CN106149441AInactive Publication Date: 2016-11-23CHINA NAT PULP & PAPER RES INST CO LTD
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022] The paint is degassed by a single-drum vacuum degasser. The diameter of the small holes on the drum is 1.5mm, the distance between the small holes is 4mm, the distance between the bottom small hole and the bottom of the drum is 15mm, and the vacuum degree in the degasser is is 50kPa. The paint viscosity is 1200mPa·s, and the paint density is 1.46g / cm 3 .

[0023] Using this method for degassing, the air content of the paint can be reduced from 13.1% before degassing to 0.22%, and the degassing efficiency is 98.32%, which meets the requirements of curtain coating.

Embodiment approach 2

[0025] The paint is degassed by a double-drum vacuum degasser. There are 0.4mm gaps on the outer drum, the gap interval is 5mm, and the bottom gap is 30mm from the bottom of the drum; 0.6mm is opened on the inner drum. The gap between the gaps is 5mm, and the bottom gap is 30mm from the bottom of the drum. The vacuum degree in the degasser is 70kPa. The paint viscosity is 2500mPa.s, and the paint density is 1.58g / cm 3 .

[0026] Using this method for degassing, the air content of the paint can be reduced from 13.2% before degassing to 0.18%, and the degassing efficiency is 98.63%, which meets the requirements of curtain coating.

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Abstract

The invention discloses an efficient vacuum degasser. Particularly, centrifugation is utilized for cooperating with a hole / seam structure to separate bubbles in coating, and the bubbles are broken under the action of vacuum and mechanical collisions. The degassing process particularly comprises the steps that the coating entering a rotating drum is subjected to centrifugal separation by a certain distance, and layering of the coating and the bubbles is achieved; the coating is continuously raised along the rotating drum wall, the coating and the bubbles are separated under the centrifugation through holes or seams in the rotating drum wall or a combination of the holes and the seams, and the separated coating is thrown to the inner wall of a vacuum tank; or the coating enters a next layer of the multi-layer rotating drum, layering and separating of the coating and the bubbles are completed, and the coating is thrown to the inner wall of the vacuum tank finally; the bubbles are broken under the impact action, and separation and removal of the bubbles are achieved. The efficient vacuum degasser is good in degassing effect, the gas content of the coating is smaller than 0.5% after degassing is conducted, and the requirement of low gas content in various production processes is met.

Description

technical field [0001] The invention relates to a degasser, in particular to a high-efficiency vacuum degasser. Background technique [0002] The problem of "bubble interference" is common in the industrial production process of biochemistry, food, chemical industry, etc., such as reducing the production efficiency of equipment, interfering with the control measurement system, making the components mixed unevenly, affecting the appearance of the product, polluting the environment, etc., which have a great impact on the production process and Product quality is affected. Some production processes allow certain air bubbles, while some production processes have very strict requirements on air bubbles, almost not allowing any air bubbles, which puts forward higher requirements on the degassing efficiency of the degassing device. [0003] In the paper industry, air bubbles can affect processes such as pulping, papermaking and coating. Compared with the pulping and papermaking p...

Claims

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Application Information

Patent Timeline
23 Nov 2016
Publication
CN106149441A
IPC
D21D5/26
Inventors
李洪才; 王比松