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Method and apparatus for precipitating solvent out of process air in spunbond production

A spunbond, fabric technology, used in textiles and papermaking, wet spinning, bundling of newly blown filaments, etc., can solve the problem of not achieving exhaust gas purity, productivity and solvent recovery, and inability to use spunbond fabric factory etc.

Active Publication Date: 2021-03-16
LENZING AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009]Due to the increased process air flow in the production of cellulosic spunbond fabrics, and the large amount of solvent and coagulant which must first be sucked away and then further discharge) and therefore the hitherto known spunbond fabric plants cannot be used since neither the productivity required for economical operation nor the recovery of solvents nor the official regulations with regard to the purity of the exhaust gases will be achieved

Method used

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  • Method and apparatus for precipitating solvent out of process air in spunbond production
  • Method and apparatus for precipitating solvent out of process air in spunbond production
  • Method and apparatus for precipitating solvent out of process air in spunbond production

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Embodiment Construction

[0040] figure 1 A device 1 according to the invention is shown, by means of which spinning material filaments 3 extruded and drawn from a spinning system 2 can be laid into a spunbond fabric 8 and dehumidified. Thus, the filaments 3 are sprayed with coagulation liquid 4 in order to regenerate the cellulose and stabilize the form of the filaments 3 , after which the process air 5 and the filaments 3 impinge on the deposition surface 6 and form a spunbond fabric 8 .

[0041] In the case of the Lyocell process, the condensate may be a mixture of fully desalinated water and NMMO in a weight percent range of 0% to 40% NMMO, preferably 10% to 30% NMMO, more preferably 15 to 25% %NMMO. The spunbond fabric 8 is dewatered by the deposition surface 6 and the dehumidification device 9, wherein the fraction of coagulants and solvents in the spunbond fabric 8 is significantly reduced.

[0042] It has been shown that for the high productivity of the spinning system 2 at cellulose flow rat...

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Abstract

The invention relates to an apparatus for laying filaments (3) to form a spunbond (8), dehumidifying the spunbond (8) and extracting the process air laden with solvent and coagulant, comprising a conveyor apparatus (7) for transporting the spunbond (8) in a transport device, the conveying device (7) having a support surface (6) for the filament (3), the conveying device (7) being permeable to gases and liquids at least in the region of the support surface (6), and a primary dehumidifying apparatus (9) being provided below the support surface (6) of the conveyor device (7), and / or at least oneupper extraction apparatus (10, 11) is arranged after and / or alongside the support surface (6).

Description

technical field [0001] The invention relates to a device for laying filaments into spunbond fabrics, dehumidifying the spunbond fabrics and sucking away process air laden with solvents and coagulants, comprising a conveying device with A conveyor belt for transporting spunbond fabrics in the transport direction, wherein a deposition surface for the filaments is arranged on the upper side of the conveyor belt, wherein the conveyor device is permeable to gases and liquids at least in the region of the deposition surface, wherein , a dehumidification device is provided on the bottom side of the conveyor belt at least below the deposition surface, wherein above the conveyor belt, close to the deposition surface, at least one suction device is provided. Furthermore, the invention relates to a method for laying the filaments into a spunbond fabric, dehumidifying the spunbond fabric, sucking off process air laden with solvent and coagulant under and above the conveyor belt, extractin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/013D04H3/02D01D5/06
CPCD01D5/06D01D7/00D01F2/00D04H3/013D04H3/02D04H3/033D04H3/16
Inventor I·萨格勒-福里奇
Owner LENZING AG