GB2247253A

GB2247253A - Carding machine and method of carding

Info

Publication number: GB2247253A
Application number: GB9018530A
Authority: GB
Inventors: Ferdinand Leifeld; Paul Teichmann
Original assignee: Truetzschler GmbH and Co KG
Current assignee: Truetzschler GmbH and Co KG
Priority date: 1989-08-31
Filing date: 1990-08-23
Publication date: 1992-02-26
Also published as: BR9004216A; IT9021354A1; JPH0397919A; ES2025960A6; GB9018530D0; IT9021354A0; DE3928824A1; IT1243209B

Abstract

In an apparatus on a carding machine, especially for removing husk neps, there is a feed apparatus (1, 2, 11) for feeding in fibre flocks from a flock reservoir, and a licker-in (3) and a cylinder (4) are arranged downstream of the feed apparatus, there being associated with the cylinder (4) separating elements (10) for impurities such as trash, dust and the like. In order to permit improved removal of husk neps there is arranged downstream of the feed apparatus and the licker-in (3), between the licker-in (3) and the cylinder (4), a pair of press rollers (14, 15). Fibre material is introduced by a stripper roller 13, from a doffer roller 12, into the gap between press rollers 14, 15 which then feed the fibre material to the transfer roller 16. <IMAGE>

Description

k Carding Machine and Method of Carding The invention relates to a carding

machine and to a method of carding, in which there is a feed apparatus for feeding fibre flocks from a flock reservoir, downstream of which feed apparatus a licker-in and a cylinder are arranged, separating elements for impurities such as trash, dust and the like being associated with the cylinder. The invention is especially concerned with providing a carding machine and method of carding in which husk neps are effectively removed.

Husk neps are very small remnants of husks. They are just recognisable to the naked eye by the fibres growing on them. The husk neps cause problems in is spinning processes, for example causing sliver breakages and the like. In a cotton-cleaning process, the breaking-down of the husk neps in the opening room and in the carding machine is far less successful than is the breaking-down of pieces of trash and shattered remains of leaves and stems. The addition of trash-separation blades on the cylinder of the carding machine is a measure that brings about a reduction, but husk neps nevertheless remain in the web and in the card sliver because the fibres that adhere to the husk remnants and that are growing firmly on them become intimately entangled with the fibres in the web (card web).

It is an object of the invention to provide an improved carding machine and method of carding which avoids or mitigates the mentioned disadvantages and which in particular allows improved removal of the husk neps.

According to the invention there is provided a carding machine, especially for removing husk neps, in which there is a feed apparatus for feeding in fibre flocks from a flock reservoir, downstream of which feed apparatus a licker-in and a cylinder are arranged, there being associated with the cylinder separating elements for impurities such as trash, dust and the like, characterised in that arranged downstream of the feed apparatus and the licker-in, between the licker-in and the cylinder, is a pair of press rollers.

According to the invention there is also provided a carding machine including a flock feed device for feeding fibre flocks, a licker-in and a carding cylinder arranged downstream of the feed device, a separating arrangement for removing impurities, and a pair of press rollers positioned between the licker-in and the cylinder.

As a result of the measures of the invention, fibres growing on husk remnants are separated from them and the separated remnants of husk and fibre are detached from the fibre composite they have formed with the product fibres. It is most preferable that a thin fibre web (approximately from 3 to 10 g/m2) be formed, the fibre web is pressed between the press rollers and the pressed web is subjected to intensive cleaning.

1 1 1 j i i - 3 New high-performance gin processes have meant that recently cottons that are greatly contaminated with crushed husk neps have been on the market. These husk fragments are not, however, broken up by the pressing but merely deformed, since they contain oil constituents from the fruit. In the case of flat pressing long fibres become detached from the husk remnant, whereas very short fibres of approximately 1 mm in length are pressed into the remnant. These flat-pressed husk remnants, which are of increased surface area, do not fall out of the fibre composite of the web as readily as, for example, crushed leaf and stem remnants. That is the reason for the intensive cleaning according to the invention, for example blade separation on a clothed roller that carries the web, for example on the cylinder. A fixed carding segment or another carding element may be connected upstream of the blade, which element is intended to assist in loosening the pressed husk remnants in order that they can then be separated more easily at the blade and removed. It is for that reason that it is so preferable that the web should only be in a very thin form, so that the advantageous effect is achieved. In particular, the thickness of the fibre-web itself in the pressed state must not be the same as or greater than the thickness of the particles that are to be pressed. The thinner the web between the press rollers, the better that cleaning. The fibre web to be cleaned has not yet 1 1 1 i 4 - been carded, that is to say has not had its fibres rendered parallel. In particular, the husk neps have not yet been destroyed. The husk neps upstream of the cylinder of the carding machine are even larger, and therefore the web can be somewhat thicker than the web on the carding cylinder.

The purpose of the pressing, which is known Der ge, of webs downstream of the carding cylinder is to crush foreign components in the fibres so that they are able to fall out as the materials are carried further. These measures have, however, been used essentially for crushing particles that allow themselves to be crushed and then fall out. Those are, for example, leaf and stem remnants that have no adhering cotton fibres growing on them. The husk neps cannot be removed in this way.

A doffer roller and a stripper roller are advantageously arranged between the licker-in and the pair of press rollers, and a transfer roller is advantageously arranged between the pair of press rollers and the cylinder. The press rollers are preferably associated with the doffer roller and the stripper roller in such a manner that the fibre material is introduced by the stripper roller, from the doffer roller, into the nip of the press rollers. The press rollers preferably feed the fibre material to the transfer roller. The direction of rotation of the doffer roller is advantageously opposed to the direction of rotation of the licker-in. The 1 t 11 1 i 1 i 1 i 1 i 1 i 1 1 i 1 i 1 direction of rotation of the stripper roller is advantageously opposed to the direction of rotation of the doffer roller. The direction of rotation of the transfer roller is preferably the same as the direction of rotation of the stripper roller. The direction of rotation of the cylinder is preferably opposed to that of the transfer roller. The speed of rotation at the licker-in is advantageously greater than the speed of rotation at the doffer roller. As a result, a thin fibre web can be obtained, as is preferred. Advantageously, the speed of rotation at the stripper roller is greater than the speed of rotation at the doffer roller. The speed of rotation of the licker-in is preferably approximately the same as the speed of rotation of the transfer roller. The clothing of the doffer is preferably in a doffing position relative to the clothing of the lickerin.

By way of example an embodiment of the invention will now be described with reference to the accompanying drawing, of which Fig. 1 Fig. la Fig. 2 Fig.

is a diagrammatic side view of a carding machine, is a diagrammatic side view of part of the machine of Fig. 1 to an enlarged scale, and shows a husk nep 1 shows a carding machine with a feed roller 1, feed table 2, licker-in 3, cylinder 4, doffer 5, stripper roller 6, web- guide element 7, can coiler 8. revolving card top 9 and separator blade arrangements 10. Mounted upstream of the feed roller 1 is a feed shaft 11 for supplying fibre flocks. Engaging the licker-in 3 is a doffer roller 12. The doffer roller 12 cooperates with stripper roller 13 downstream of which a pair of press rollers 14, 15 is arranged. Arranged downstream of the pair of press rollers 14, 15 is a transfer roller 16 which transfers the fibre material to the cylinder 4.

The press rollers 14, 15 are associated with the doffer roller 12 and the stripper roller 13 in such a manner that the fibre material is introduced by the stripper roller 13, from the doffer roller 12, into the gap between the press rollers 14, 15. The press rollers 14, 15 feed the fibre material to the transfer roller 16.

The directions of rotation of the rollers 1, 3, 4, 5, 6, 12, 13, 14, 15 and 16 are shown by curved arrows.

The speed of rotation of the licker-in 3 (diameter, for example 250 mm), for example approximately 900 rpm, is greater than the speed of rotation of the doffer roller 12, for example approximately 250 rpm. The speed of rotation of the stripper roller 13, for example 350 rpm, is greater than the speed of rotation of the doffer roller 12. The speed of rotation of the cylinder 4 (diameter for example 1290 mm) is, for example, approximately 450 rpm. The speed of rotation of the press -A i 1; 1 1 1 t 1 j i 1 i i i 1 j rollers 14, 15 is, for example, approximately 850 rpm. The speed of rotation of the transfer roller 16 is approximately the same as that of the licker-in 3.

In Fig. la the direction of the clothing tips is shown in the rollers 1, 3, 4, 5, 6, 12, 13 and 16 by short lines.

Figure 2 shows a husk nep in which fibres 18 are growing on a husk fragment 17.

1

Claims

1. A carding machine including a flock feed device for feeding fibre flocks, a licker-in and a carding cylinder arranged downstream of the feed device, a separating arrangement for removing impurities, and a pair of press rollers positioned between the licker-in and the cylinder.

2. A carding machine according to claim 1, in which arranged between the licker-in and the pair of press rollers are a doffer roller and a stripper roller and between the pair of press rollers and the cylinder is a transfer roller.

3. A carding machine according to claim 2, in which the press rollers are associated with the doffer roller and the stripper roller in such a manner that the fibre material is introduced by the stripper roller, from the doffer roller, into the gap between the press rollers.

4. A carding machine according to claims 2 or 3, in which the press rollers cooperate with, and are arranged to feed the fibre material to, the transfer roller.

5. A carding machine according to any one of claims 2 to 4, in which the direction of rotation of the doffer roller is opposed to the direction of rotation of the licker-in.

j M P Sk A i i 1 1 i

6. A carding machine according to any one of claims 2 to 5, in which the direction of rotation of the stripper roller is the same as the direction of rotation of the doffer roller.

7. A carding machine according to any one of claims 2 to 6, in which the direction of rotation of the transfer roller is opposed to the direction of rotation of the stripper roller.

8. A carding machine according to any one of claims 2 to 7, in which the direction of rotation of the cylinder is opposed to the direction of rotation of the transfer roller.

9. A carding machine according to any one of claims 2 to 8, in which the speed of rotation of the licker-in is greater than the speed of rotation of the doffer roller.

10. A carding machine according to any one of claims 2 to 9, in which the speed of rotation of the stripper roller is greater than the speed of rotation of the doffer roller.

11. A carding machine according to any one of claims 2 to 10, in which the speed of rotation of the licker-in and of the transfer roller are approximately the same.

12. A carding machine according to any one of claims 2 to 11, in which the clothing of the doffer roller is in a doffing position relative to the clothing of the licker-in

13. A carding machine substantially as herein described with reference to and as illustrated by Figs. 1 and la of the accompanying drawings.

14. A method of carding employing a carding machine as claimed in any preceding claim.

Published 1992 at The Patent Office. Concept House. Cardifr Road. Newport. Givent NP9 1RH. Further copies may be obtained front Sales Branch. Unit 6. Nine Mile Point. Cu-rnfehnfach. Cross Keys. Newport. NPI 7HZ. Printed by Multiplex techniques ltd. St Mary Cray. Kent- i 1 i 1 i t,' 1 p