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Process for yarn or sliver refining

A yarn and sliver technology, applied in the field of refining machines, can solve the problems of small yarns or sliver openings, and achieve the effect of reducing the risk of accumulation

Inactive Publication Date: 2009-05-13
TEIJIN ARAMID BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These openings are not suitable for leading the yarn or sliver to the refiner because the inlet is set on the wrong side of the refiner and also because these openings are less than 1mm and therefore too small to be used as openings for the yarn or sliver

Method used

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  • Process for yarn or sliver refining
  • Process for yarn or sliver refining
  • Process for yarn or sliver refining

Examples

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example 1

[0063] This example describes four experiments. Four different raw materials were processed into slurries in these experiments. The different raw materials are dry and wet (never dried) yarn or sliver. The conditions and results of the purification according to the present invention are shown in Table 2. The result of this refining is different lengths of yarn or sliver suspended in water. In contrast to conventional refining processes, this yarn or sliver suspension has a further processing step in which the yarn or sliver suspension is fed to a refiner. The conditions and results of this procedure are shown in Table 3. The result of this process is a slurry comparable to commercial slurries. The experiments were performed in a laboratory scale refiner.

[0064] Measurements carried out on the size obtained showed that the quality of the size was improved by using never-dried yarn. The SR value and paper strength value are higher, which is important for the application ...

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Abstract

The invention discloses a process for refining yarn or sliver having a length of at least 1 meter, comprising the step of feeding the yarn or sliver and a liquid into a refiner, which comprises refiner fillings having a body surrounding a central hole (7), and at least one inlet (1) for the yarn or sliver, and the thus obtained pulp-like materials and its use for making friction materials, paper, and gaskets. In particular, the refiner has a refiner filling (8), wherein the yarn or sliver is fed through an inlet positioned in the refiner filling. The present invention further relates to the refiner filling comprising at least one, preferably eccentric, inlet for yarn or sliver. The inlet comprises an inlet hole which comprises an inclined slope (2) on the outflow side of the inlet, the inclined slope serving to guide the yarn or sliver from the inlet hole to the surface of the refiner filling. The invention further relates to a refiner comprising such refiner filling.

Description

technical field [0001] The invention relates to a process for refining yarn or sliver, to a refiner filler and to a refiner comprising said refiner filler. Background technique [0002] Slurries such as poly-p-phenylene terephthalamide (PPTA) pulp can be prepared by so-called refining, which involves chopping the fibers to obtain the desired fiber length and at the same time fibrillating the fibers to give them a rough or fluffy shape appearance. [0003] Refining fibers currently requires fiber pretreatment, wherein (semi)continuous fibers are pre-cut to obtain individual fiber segments with suitable shorter dimensions to be able to prepare liquid suspensions. Typically, the fibers come out of the fiber spinning process wet. Cutting wet (never-dried) fibers is not feasible due to the tendency of knives to break, so cutting pretreatment requires the fibers to be dry. This is disadvantageous not only for economical reasons but also because of the well known improvement of ...

Claims

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Application Information

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IPC IPC(8): D21D1/30B02C7/00
CPCD21D1/306D21D1/30B02C7/00
Inventor G·J·里特豪斯特V·A·范博梅尔J·W·D·威尔林E·M·温克勒S·J·博芬申
Owner TEIJIN ARAMID BV
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