CH714818A1 - Tape forming unit for a card. - Google Patents

Abstract

The present invention relates to a tape forming unit (16) for a card with two transverse bands (20) for nonwoven assembly, comprising at least one guide hopper (24) and a pressure roller pair (26), wherein the transverse bands (20) have an opposite direction of movement and at a distance their deflection to the passage of the merged nonwoven tape (18) are arranged against each other. Between the transverse bands (20) are nonwoven ribbon guides (27, 28) for guiding the nonwoven ribbon (18) to the guide funnel (24), wherein by the nonwoven ribbon guides (27, 28) a guide of the nonwoven ribbon (18) to the guide funnel (24) perpendicular to Direction of movement of the transverse bands (20) and the direction of movement (23) of the fiber fleece (17) is provided.

Description

(57) The present invention relates to a belt forming unit (16) for a card with two transverse belts (20) for fleece assembly, with at least one guide funnel (24) and a pair of pressure rollers (26), the transverse belts (20) having an opposite direction of movement and with a distance at their deflection points for the passage of the merged fleece band (18) are arranged against each other. Fleece tape guides (27, 28) for guiding the fleece tape (18) to the guide funnel (24) are arranged between the cross belts (20), with the fleece tape guides (27, 28) guiding the fleece tape (18) to the guide funnel (24) perpendicularly Direction of movement of the cross belts (20) and the direction of movement (23) of the nonwoven fabric (17) is provided.

CH 714 818 A1

Description: The present invention relates to a banding unit for a card.

The card produces a card sliver from fed fiber material, which is subsequently processed into a yarn. A carding machine is usually assigned a filling shaft which is supplied with fibers from a blow room by a conveyor system. The fibers are cleaned and parallelized by the card. For this purpose, the fibers are passed over a card drum. The fibers are removed from the card drum by a customer in the form of a nonwoven fabric and fed to a band forming unit. The customer essentially consists of a take-off roller, a transfer roller and a pair of output rollers. The nonwoven extends across the entire working width of the card. The nonwoven fabric is combined into a carding tape in the tape forming unit. After leaving the pair of output rollers, the nonwoven meets a cross belt which causes the nonwoven to be conveyed in the axial direction of the pair of output rollers. As a result, the fibers of the nonwoven are conveyed to the end of the cross belt and thus brought together. A cross belt is used for cards with a small working width. For cards with a larger working width, two opposing cross belts are usually used. After the cross belt, the merged fiber fleece passes through various guides and funnels to a pair of pressure rollers, which brings about the final shaping of the card sliver.

[0003] For example, a banding unit of a card according to EP 1 001 059 A1 is known from the prior art. Cross belts are used for the merging, which pass the merged nonwoven fabric on to a discharge unit. The merged nonwoven is received in a funnel-shaped guide element after the oppositely moving transverse bands release the merged nonwoven. The disadvantage here is that the fleece is not guided through the cross belts during the bringing together. As a result, the nonwoven fabric can move freely in a direction transverse to the direction of movement of the cross belts, as a result of which a perfect transfer of the nonwoven fabric brought together by the cross belts to the funnel-shaped guide element is not guaranteed at high production speeds.

The object of the present invention is therefore to provide a banding unit of a card which ensures guidance of the nonwoven fabric during the merging at the point where the two transverse bands bring the fibers together.

The object is achieved by a band forming unit with the features of the independent claims. A band forming unit for a card with two crossbands for fleece merging is proposed, with at least one guide funnel and a pair of pressure rollers, the crossbands having an opposite direction of movement and being arranged at a distance from one another at their deflection points for passage of the merged fleece band. Fleece tape guides for guiding the fleece tape to the guide funnel are arranged between the cross belts, the fleece tape guides providing guidance of the fleece tape to the guide funnel perpendicular to the direction of movement of the cross belts and the direction of movement of the nonwoven fabric.

Due to the high belt speeds at high production of up to 8 m / sec or more, a merging of the nonwoven at the end of the crossbands at which the crossbands bring together the fibers of the nonwoven to form a nonwoven band means that fibers accumulate or spliced off and out avoid the actual direction of movement of the cross belt. This process is contained by the arrangement of the fleece belt guides. The fibers are guided through the fleece belt guides transversely to the direction of movement of the fleece belt. The fleece belt guides fill the gaps that are open between the cross belts up and down. The fibers, which are conveyed against each other by the cross belts and brought to the guide funnel through the opening between the cross belts, are guided to the guide funnel by the nonwoven belt guides even at high production speeds, without any vertical escape option.

Advantageously, the nonwoven belt guides from the pair of output rollers to the narrowest point between the cross belts have a shape that is concentrically adapted to a deflection radius of the cross belts in the deflection point. In the further course from the narrowest point between the cross belts against the guide funnel, a distance between the cross belt and the fleece belt guide increases continuously. This prevents jamming or jamming of fibers or parts of the nonwoven web. At the deflection point, the cross belts are guided over deflection rollers. The deflection radius of a cross belt corresponds to the sum of the radius of the deflection roller and a thickness of the cross belt. The fact that the shape of the nonwoven belt guides essentially corresponds to the deflection radius of the transverse belt enables the opening between the transverse belts to be closed as completely as possible.

It is also advantageous if opposite surfaces of the nonwoven tape guides each have an inclination on a side facing away from the guide funnel, the inclination causing the distance between the surfaces of the nonwoven tape guides to increase as the distance from the guide funnel increases. The side of the fleece belt guide opposite the guide funnel corresponds to the inlet side of the fleece belt. Since the nonwoven can not be brought together in a line by the transverse belts, it is advantageous if the inlet side of the nonwoven belt guides is designed such that the interaction of the opposing surfaces of the nonwoven belt guides results in a conical inlet in the direction of the guide funnel. The conical part and thus the inclination of the surfaces preferably lead to the narrowest point between the transverse bands. The inclination depends on

CH 714 818 A1 is the size of the output rollers of the card and the distance of the banding unit from the output rollers and is preferably 10 to 45 angular degrees, particularly preferably 20 to 30 angular degrees, with the dimensions customary today in cards. Following the inclined part of the surfaces, the guidance of the nonwoven tape is continued with a constant distance between the opposite surfaces of the nonwoven tape guides.

Advantageously, the opposite surfaces of the nonwoven tape guides each have a guide groove. The guide groove results in a bundled guidance of the fleece belt to the guide funnel. The guide grooves are preferably in the form of grooves with a depth of 1 mm to 5 mm and a radius of 8 mm to 20 mm, particularly preferred is the depth 3 mm and the radius 12 mm to 14 mm. The guide grooves extend over the entire length of the opposing surfaces of the nonwoven tape guides and are also continued in the inclined part of the surface.

Furthermore, it is advantageous if the inclined surfaces are formed sloping on both sides of the guide groove in the direction of the respective cross belt. The surfaces formed with an inclination are additionally arranged obliquely away from the nonwoven belt against the respective transverse belt. The result is an inclined plane which, on the one hand, has an inclination towards the nonwoven web inlet and, on the other hand, against the direction of movement of the crossbands. This prevents the merged fibers of the nonwoven from jamming during the transition from the card's exit rollers into the space formed by the transverse belts and the nonwoven belt guides. There is a gentle and even merging of the nonwoven fabric to the nonwoven web by continuously narrowing the passage.

It is further proposed that the cross belts are provided with two spaced-apart limiting profiles for guiding the nonwoven belt in the direction of movement of the cross belts. At least two spaced-apart boundary profiles are provided on an outer surface of the transverse belt facing the nonwoven or non-woven belt, which extend over the entire length of the transverse belt. Due to the fact that the limiting profiles are arranged on the cross belt and consequently move with the cross belt, an increase in fiber friction and a resulting fiber damage is avoided in comparison to stationary guides. The limiting profiles are advantageously arranged symmetrically on the cross belt at a distance of 30 mm to 50 mm. The dimensions result from the strength and run-out speed of the nonwoven produced as well as the thickness of the card sliver to be achieved. It has been shown that a spacing of the limiting profiles of 40 mm is preferable in today's high-performance cards.

Preferably, the opposing surfaces of the nonwoven tape guides are arranged at the same distance as the boundary profiles. As a result, there is no further cross-sectional constriction for the nonwoven web in the direction transverse to the direction of movement of the crossbands at the point of merging.

Furthermore, it has been shown that a distance between the fleece belt guide and the cross belt or the surface of the boundary profiles is advantageously 1 mm to 4 mm, particularly preferably 3 mm. This takes account of operational tolerances. The distance is also selected so that no air flows interfere with the merging process.

The nonwoven tape guides are advantageously made of a metallic material and provided with a coating or alternatively are made of a plastic. The coating to be used or a plastic used have the necessary sliding properties for the friction-minimized conveying of fibers. Different materials can also be used for the nonwoven belt guides for different fiber materials, since PES fibers, for example, do not have the same sliding properties as cotton or viscose fibers. For example, coatings with hard chrome or plastics such as POM are suitable.

A card with a band forming unit is also proposed, two nonwoven band guides being provided in the band forming unit as described above.

[0017] Further advantages of the invention are described in the following exemplary embodiments. It shows:

1 is a schematic side view of a card according to the prior art,

2 is a schematic side view of a band forming unit,

3 shows a schematic top view in the direction X of the banding unit according to FIG. 2,

Fig. 4 is a schematic view of a nonwoven web guide according to the invention in elevation, side view and plan.

Fig. 1 shows a card 1 equipped with a feed chute 2, a feed chute discharge 5 and a feed channel 3. Fiber flakes 4 arrive after they have gone through the various process steps of a blowroom in the feed chute 2. The fiber flakes 4 are through the feed chute discharge 5th , comprising a feed roller 6 and an opening roller 7 and an air supply 8, passed on to the feed channel 3. An air supply 8 is provided in the filling chute discharge 5 to support the transfer of flakes to the feed channel 3 and to ensure wad compression in front of a feed device 10 of the card 1. The air supply 8 blows air tangentially on the up

CH 714 818 A1 release roller 7 along into the feed channel 3 and thereby compresses the fiber flakes into a batting with a high batting weight necessary for further processing in the card 1. A feeding device 10 following the feed channel 3 feeds the fiber flakes, now in the form of a homogeneous wadding 11, to the licker-in module 12 of the card 1. The fiber flocks emitted by the feeding device 10 from the wadding template 11 are opened further by the licker-ins contained in the licker-in module and at the same time freed from part of the impurities contained therein. The last licker-in roller of the licker-in module 12 finally transfers the fibers to the card drum 13, which completely dissolves and parallelises the fibers. The card drum 13 works together with the lid assembly 14. After the fibers have, in part, carried out several revolutions on the card drum 13, they are removed from the card drum 13 by a removal unit 15 in the form of a non-woven fabric 17 and fed to a band forming unit 16 with a pair of output rollers 9. The nonwoven fabric 17 formed by the carding drum 16 is formed into a carding tape 19 by the tape forming unit 16. The card sliver 19 is then placed in a can for further transport (not shown).

FIG. 2 shows a schematic side view of a belt forming unit 16 and FIG. 3 shows a schematic plan view in the direction X of the belt forming unit 16 according to FIG. 2. The nonwoven fabric 17 arriving in the belt forming unit 16 in the direction of movement 23 is captured by a pair of output rollers 9 and paired transverse bands 20 forwarded. The transverse bands 20 are arranged opposite one another in one plane. The respective ends of the cross belts 20 are guided over deflection rollers 21 and driven in opposite directions, so that the cross belts 20 move towards one another in their direction of movement 30 along the output roller pair 9. The transverse bands 20 are at a distance C at a narrowest point 34. By means of the cross belts 20, the nonwoven fabric 17 is combined to form a nonwoven web 18 in the direction of the longitudinal axis of the pair of output rollers 9. The nonwoven fabric 17 is guided transversely to its direction of movement 23 in the pair of output rollers 9 between the two transverse belts 20. This movement 30 brings the nonwoven fabric 17, which is extended over the length of the pair of output rollers 9, through the transverse belts 20 to the narrowest point 34 between the transverse belts 20 and is brought together to form the nonwoven belt 18. So that the fibers do not dodge transversely to the direction of movement 30 of the transverse bands 20 during the merging, the transverse bands 20 are provided with limiting profiles 22. The boundary profiles 22 are arranged in pairs on the surface of the cross belt 20 at a distance A. Depending on the fiber material to be processed, these limiting profiles 22 can also be dispensed with.

To support the guidance of the fleece belt 18 between the cross belts 20, fleece belt guides 27 and 28 are arranged. The fleece belt guides 27 and 28, which delimit the space between the cross belts 20 and the output roller pair 9 and the guide funnel 24, are arranged above and below the delimitation profiles 22. The fleece belt 18 is guided between an upper surface 31 of the upper fleece belt guide 27 and a lower surface 32 of the lower fleece belt guide 28 through the narrowest point 34 between the transverse belts 20. A distance B between the surfaces 31 and 32 of the nonwoven tape guides 27 and 28 corresponds to the distance A between the boundary profiles 22 of the cross belts 20. The nonwoven tape guides 27 and 28 are formed on the side facing a cross belt 20 at a deflection radius R of the cross belt 20 and in a certain distance F (see Fig. 4) to the cross belt 20. The deflection radius R is determined by the outermost surface of the limiting profiles 22 at the deflection point of the cross belt 20 around the deflection roller 21.

After the nonwoven web 18 has passed through the constriction between the transverse belts 18 and the nonwoven web guides 27 and 28, the nonwoven web is taken over by a guide funnel 24. The guide funnel 24 serves to reduce the extent of the nonwoven web 18 and to pass it on to the end funnel 25. From the end hopper 25, the nonwoven web 18 arrives in a pair of pressure rollers 26. The pair of pressure rollers 26 form the nonwoven web 18 into a carding web 19. Another function of the pair of pressure rollers 26 is to pull the nonwoven web 18 through the funnels 24 and 25.

FIG. 4 shows a schematic view of a fleece belt guide 28 according to the invention in elevation, side view and plan view. The fleece tape guide 27 shown in FIGS. 2 and 3 is correspondingly mirror-inverted. The shape of the fleece belt guide 28 is aligned with that of the cross belt 20. Seen in a first part in the direction of movement 23, the contour of the fleece belt guide 28 is arranged concentrically to at a distance F from the cross belt 20. Seen in a second part in the direction of movement 23, the contour of the fleece belt guide 28 is molded onto the cross belt in such a way that the distance F between the fleece belt guide 28 and the cross belt 20 increases continuously. Ideally, a transition from a constant distance F to a diverging distance F is arranged at the narrowest point 34 (see FIG. 3). The fleece belt guide 27 has a surface 32 which serves to guide the fleece belt. The surface 32 or at least part of it is designed to be inclined at an angle α relative to the horizontal in the direction opposite to the direction of movement 23 of the nonwoven web shown. Furthermore, a guide groove 29 with an arcuate cross section is provided in the surface 32 over the entire length of the nonwoven tape guide 32. The guide groove 29 has a depth D and a radius E.

The parts of the surface 33 which are located on both sides of the guide groove 29 in the region of the pair of output rollers 9 (see FIG. 3) are designed as inclined surfaces 33. The inclined surfaces 33 are each arranged obliquely away from the nonwoven web against the adjacent cross belt 20.

CH 714 818 A1 [0024] The present invention is not restricted to the exemplary embodiments shown and described. Modifications within the scope of the claims are possible as well as a combination of the features, even if these are shown and described in different exemplary embodiments.

LIST OF REFERENCE NUMERALS [0025]

teasel

hopper

feeding channel

fiber flocks

Füllschachtaustrag

feed roll

opening roller

air supply

Roller pair

feeder

Watt template

Vorreissermodul

carding drum

flat unit

customer

Banding unit

non-woven fabric

sliver

Kardenband

transverse

idler pulley

limiting profile

Direction of movement non-woven and non-woven tape

guide funnel

terminal hoppers

Pair of pressure rollers

Upper fleece belt leader

Lower fleece belt guide

guide groove

Direction of movement cross belt

Upper fleece belt guide surface

Lower fleece belt guide surface

CH 714 818 A1

Sloping surface

Narrowest point between cross belt and fleece belt guide

A distance of the limitation profiles

B Distance of the fleece belt guide

C Crossbeam spacing

D Deep guide groove

E Radius guide groove

F Distance between fleece belt leader and cross belt

Claims (10)

R deflection radius cross belt α inclination surface of non-woven belt guide claims 1. belt forming unit (16) for a card (1) with two transverse belts (20) for fleece assembly, with at least one guide funnel (24) and a pair of pressure rollers (26), the transverse belts (20) having an opposite direction of movement and with a distance ( C) are arranged against each other at their deflection points for the passage of the merged nonwoven web (18), characterized in that nonwoven web guides (27, 28) for guiding the nonwoven web (18) to the guide funnel (24) are arranged between the crossbands (20) the fleece belt guide (27, 28) is provided to guide the fleece belt (18) to the guide funnel (24) perpendicular to a direction of movement of the cross belts (20) and to the direction of movement (23) of the nonwoven fabric (17). 2. Belt forming unit (16) according to claim 1, characterized in that the fleece belt guide (27, 28) in the direction of movement (23) of the nonwoven fabric (17) at least up to the narrowest point (34) between the transverse belts (18) concentrically to a deflection radius (R) of the cross belts (20) have adapted shaping in the deflection point. 3. belt forming unit (16) according to claim 1 or 2, characterized in that the nonwoven tape guides (27, 28) in the direction of movement (23) of the nonwoven fabric (17) at least after a narrowest point (34) between the transverse belts (20) with a increasing distance (F) between the cross belt (20) and the fleece belt guide (27, 28) are formed. 4. Belt forming unit (16) according to one of the preceding claims, characterized in that opposite surfaces (31) of the nonwoven belt guides (27, 28) each have an inclination (a) on a side facing away from the guide funnel (24), the inclination ( a) distance to be increased from the guide funnel (24) causes an increase in the distance (B) between the surfaces (31, 32) of the nonwoven tape guides (27, 28). 5. belt forming unit (16) according to claim 4, characterized in that opposite surfaces (31, 32) of the nonwoven belt guide (27, 28) each have a guide groove (29). 6. banding unit (16) according to claim 5, characterized in that the guide grooves (29) have a depth (D) of 1 mm to 5 mm and a radius (E) of 8 mm to 20 mm. 7. band forming unit (16) according to any one of claims 4 to 6, characterized in that the inclined surfaces (33) on both sides of the guide groove (29) are formed sloping in the direction of the respective transverse belt (20). 8. belt forming unit (16) according to any one of the preceding claims, characterized in that the cross belts (20) with two spaced apart (A) limiting profiles (22) for guiding the fleece belt (18) in the direction of movement of the cross belts (30) are. 9. belt forming unit (16) according to claim 4, characterized in that the opposing surfaces (31,32) of the nonwoven belt guides (27, 28) are arranged at a distance (A) of the boundary profiles (22). 10. belt forming unit (16) according to any one of the preceding claims, characterized in that a distance (F) between the nonwoven belt guide (27, 28) and the cross belt (20) or the surface of the boundary profiles (22) is 1 mm to 4 mm.