JPH07502311A - Sliver spinning equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Sliver spinning equipment The invention relates to a sliver spinning device according to the preamble of claim I. It is something.

A device for jet spinning is known from DE 35 41 219 Al. this device is composed of an injector section and a false twist section adjacent to the injector section.

The injector and false twisting section are located directly downstream of the drafting device for drafting the sliver. It is location. With this device it is possible to produce good quality yarn. however , it is not possible to wrap the edge yarn around the core yarn in a satisfactory manner.

EP-A-418694 discloses a nozzle device in which the thread path is connected by an insert. an inlet hole that forms a "shoulder" and opens into the duct behind the shoulder in the passing direction. We are prepared. Although this arrangement is a step in the right direction, it is still an optimal It's not a strategy.

BP-A-449073 and BP-A-450371 are suitable for jet spinning. A raft mechanism is disclosed. In order to optimize the system, it is important to Separate the functions of each component to the extent possible and consider them separately. That's true. From this perspective, there are three optimal jet spinning systems. It consists of substantial constituent elements. That is, A device such as a draft mechanism (DB -Refer to A-354219, etc.) - Generates false twist in the fiber structure and connects the heated core yarn with A false-twist heating spun that produces weft yarns (Randfasen) protruding from this core yarn. - Arranged between the draft mechanism and the false-twisting heating spindle, the hem yarn is placed around the core yarn. The purpose of this invention is to wrap around the injector section so that each of these elements a function that can best be accomplished and that other elements of the system are The purpose of this is to prevent the entire focus from being lost.

This object can be achieved according to the invention by the features of claim 1. . This sliver is drafted and expanded in a drafting mechanism, initially in this state. reaches the injector section. Here, the edge threads are suctioned and the heating element It assumes a position on the yarn core which has been falsely twisted by the heating effect. For false-twisted elements, The overopening is initially narrow due to the sliver and then widened into tufts. tufted extensions Immediately after the air inlet hole opens into the interior space of the false-twist heating element.

In the area of the air vents the sliver is located close to the inner wall surface of the false-twisted heating element. Do not place Thus, air flows into the internal space of the false-twisted heating element through the inlet holes. The air jet impinges on the fiber structure, which undergoes false twisting in this region. There is no lateral guidance through the inner wall of the thermal element. Therefore, at this position it is empty. The air jet occupies a very good position to act on the fibers of the fibrous structure.

along the walls of the fiber structure moving in a spiral manner within the internal space of the false-twisted heating element. The portion of the sliver that does not slide is moved tortuously through the air stream. this invention Since the air flowing through the inlet hole has a good working area, it has a good heating effect. You can get results. This twist continues all the way to the draft mechanism. A coated fiber is formed on the outside of the spinning triangle. This narrows the spinning triangle do the work. The sliver comes out of the draft mechanism, but the width at that time is the injector. It is at least 1.5 times the inner diameter of the nozzle.

In this way, the width of the sliver at the exit of the draft mechanism is expanded more than the spinning triangle. It will be done. This deliberate formation of the cover fibers ultimately results in a core that is parallelized. Good coverage of the fibers in the area by the weft yarns is achieved, in other words, the necessary strength of the yarns is obtained. be able to.

By configuring the false twisting element to be shortened compared to the injector section, false twisting can be achieved. It is possible to optimize the formation and evenly distribute the edge yarns against the core yarns (core yarn coverage ) can be achieved. In order to achieve even distribution of edge threads, uniform covering is performed. This is achieved by providing conditions that make it compulsory. For that purpose, flow conditions are maintained and the rotational movement induced therefrom is necessary to effect the coating. There is a point. Friction on the wall of the injector plays an active role.

In the case of heating elements, the friction of the yarn on the wall of the false twisting element is minimized as much as possible. less is required. Does such friction impair the ability to impart false twist? It is et al. The maximum possible delivery speed for a given false twist is determined by increasing the yarn speed. Therefore, it can also be increased. However, the selection of the length of the false twisting elements is A helix is formed in the yarn and under the influence of air flow acts as a real false twister should be selected accordingly.

The length of the injector section is preferably 30% longer than the length of the false twisting element, if necessary. The case is long up to 100%. In a preferred embodiment, the injector section is a false-twisted element. 50% longer.

The length of the false-twisted member can be selected between 25 and 35 mm (preferably 30 mm). can. The length of the injector part is preferably not less than 40 mm.

The rotation generated in the false twisting element is not transmitted back to the draft mechanism. Especially if the injector element has a substantially constant cylindrical internal member. suitable. In this way, the rotation of the thread is not impaired. In addition, this reduces friction loss and causes almost no damage to the yarn. injector element The low-friction rotation of the yarn in the thread is especially possible with the false twisting element. This is when the expanded inner diameter of the injector is equal to or smaller than the inner diameter of the injector section.

In order to achieve a particularly favorable bending (cranking) effect of the air flow on the cover fibers, The distance of the air inlet hole from the waste widening is determined by the difference in the inner diameter of the false-twisting element, i.e. the shoulder It has been found that it is necessary to be equal to or less than the height. In this way , it is possible to ensure a good point of action of the air flow on the coated fibers.

A particularly preferred embodiment is when the internal diameter of the false-twisting element is between 2.2 and 2.8 m. It turns out that

The axis of the air introduction hole is in its projection relative to the axis of the internal space of the false-twisting element. The airflow acting on the threads was particularly effective when arranged at right angles. The fiber is It is powerfully rotated by the airflow just after the shoulder.

If multiple air inlets act on the thread, a favorable uniform force is applied to the thread. . In this regard, the air inlet shall be connected to the false twisting element according to BP-A-489686. Preferably, it opens tangentially and radially outwardly with respect to the interior space.

The ratio of the expanded inner diameter to the length is preferably from 1:6 to l:16 for false-twisting elements. It turned out to be quite long. The ratio from 1:12 to 1+14 has the best quality and Strength was obtained.

The inlet hole arranged in the injector part is at an angle of 30° with respect to the axis of the injector part. Preferably, it is arranged in degrees. The preferred covering of the core fibers with edge threads is The width of the sliver coming out of the raft mechanism is larger than the inner diameter of the injector part. There is. Preferably, the width of the sliver is 1.5 times the inner diameter of the injector section.

In this case, the sliver is fed loosely into the air stream and is thus easily It can be heated to.

In one embodiment, the carrier of the air inlet hole from the door-shaped widening of the false-twisting element is 0. Shorter than 5mm. In this way, very good spinning results can be achieved. Ru.

Hereinafter, details of the present invention will be explained with reference to the following accompanying drawings.

FIG. 1 shows a false twisting element.

FIG. 2 shows details of the waste expansion.

FIG. 3 is a sectional view through the false-twisting element in the area of the air inlet holes.

FIG. 4 is a side view of a suitable draft mechanism.

FIG. 5 is a diagram showing the +r force direction from FIG. 4).

Figures 6 to 11 are schematic diagrams explaining the effects of the parts shown in Figures 1 and 2. This is a schematic diagram.

FIG. 1 shows an apparatus according to the invention for spinning sliver. Injector part l and The false twisting element 2 constitutes a pneumatic false twisting device.

This false twisting device has a pair of delivery rollers 3.4 in the direction of passage of the sliver (not shown). is located downstream of the Delivery roller pair 3.4 is the last roller pair of the draft mechanism. The supplied sliver is drawn and has the strength of spun yarn. Delivery roller 3.4 The width of the arriving sliver from is wider than the inner diameter A of the injector part l. Delivery roller The sliver emerging from 3.4 reaches the internal chamber 12 of the injector part 1.

In the internal chamber 12, the sliver is subjected to an air flow, which The internal chamber I2 is reached through the air inlet hole 10.11. air inlet The bore 10.11 is arranged at an angle α in the injector part l. on the projection surface An angle of approximately 30° between the axis of the injector section 1 and the axis of the air inlet is preferred. I know something is wrong. In order to obtain good guidance of the later cover fibers at this angle α Particularly preferred.

with the lowest possible friction and up to the nip point on the delivery roller 3.4 The internal chamber 12 of the injector part l is cylindrical in order to obtain good continuity. It is located in

The false twisting element 2 is arranged downstream of the injector part l at a short distance. Ru. When flowing into the false twisting element 2, the sliver is initially guided by the narrow part 220. Ru. The diameter C of the narrow part 220 is smaller than the diameter A of the injector part I. The diameter C is the The small part is not thin enough to function as a twist stop for the thread, or the small part is It is not so thin that it can occlude it by engaging the thread as it passes through.

A diametrical waste-like widening continues into the pinched portion 220. The diameter is 2.2 and 2.8 It has been found that values between mm are preferred. The pinched part 220 is It must be short so that thread friction can be kept low. straight An air inlet hole 200, 210 is formed immediately after the waste widening for the radius, and this air inlet hole 200. Air is admitted into the internal chamber 230 through the air inlet holes 200.210. door shape The widening allows the incoming air to suitably impinge on the thread portion located in the internal chamber 230. Achieve a coercive effect. A good false twist can be imparted to the yarn by the action of air. Becomes Noh. The thread is attached to the wall of the internal chamber 230 at the location of the air inlet holes 200, 210. It does not slide along the air, but is rotated like a crank by the air flow.

This rotation is extended over a wide range up to the nip point on the delivery roller 3.4.

Stable spinning conditions can be obtained because there is no decrease in twist in the narrow part 220. This can increase the strength of the thread. The cover fiber wraps around the yarn core. Due to the width of the sliver leaving the draft mechanism, the formation takes place in a targeted manner. child to obtain a suitable coverage of the inner fibers by the outer fibers of the yarn and the necessary strength of the yarn. can be obtained.

Due to the large inner diameter of the injector part, the supply of yarn to the false twisting element 2 is It is done so that good rotation occurs. In this way, the air inlet in the thread part The airflow working through 200.210 will have a large arm length. to that projection , the rectangular arrangement of the air inlets 200, 210 with respect to the axis of the false-twisting element 2 A good rotation of the strands can be obtained. Injector part l and false twisting element In order to reduce the frictional force of the part of the yarn rotating at the twisting point 2, the false twisting element 2 is It is preferable to arrange the injector part l to be shorter than the injector part l. In this way, inside Damage to the yarn due to friction against the inner wall of the chamber 230 can be substantially prevented. . As a result, the yarn can have high quality.

The optimal length relationship will be explained in more detail with reference to FIGS. 6 to 11. according to the exam If so, the length of the false twisting element 2 is approximately 30 mm (between 25 mm and 35 mm). can do. The partial length between the air inlet opening and the nozzle outlet is approximately 20 mm (between 18 mm and 22 mm).

In a particularly preferred arrangement, the length to expanded inner diameter ratio of the false-twisting element 2 is l double. Therefore, 1=16. The inner chamber 230 expands conically in the direction of thread passage. be able to. This is indicated by the dashed line in FIG. into the internal chamber 230 By forming a conical expansion part, it is possible to further reduce thread friction. . However, the internal chamber 12 of the injector part l is arranged in a cylindrical manner. It is preferable.

According to tests, the length of the injector part 11 is approximately 45 mm (40 mm and 50 mm). ) is preferable. There is no need to provide more than one air inlet; It can be placed in the center ⅓ of the ejector section. Air inlet hole of injector part The length of the area between and the outlet is preferably approximately equal to the length of the spaced apart portion of the cover fiber. stomach.

The nozzle should be installed as close as possible to the delivery roller of the draft mechanism. There is. Thus, the suction flow caused by the injector section 1 will cause the "edge fibers" to It will take a position to guide it to the nozzle. The large diameter is effective against this suction effect. It becomes ikuuri.

FIG. 2 shows the arrangement of the waste expansion and the air inlet holes 200, 210. entrance chan As a result, a shoulder portion having a height C is formed by expanding the narrow portion 220 with respect to the bar 230. Become. Thus, a particularly effective effect of the air flow on the sliver is achieved by Is the distance of the air inlet hole 210 from the expanded portion equal to the difference in the inner diameter of the false twisting element? When it is larger than that, that is, when it is smaller than or equal to the shoulder height C. Ru. A distance of 0.5 mm is a particularly suitable value. Air inlet hole 200.210 is It is particularly preferable that the diameter of the tube is approximately 0.3 mm.

FIG. 3 shows a cross-section through the false-twisting element 2 in the area of the air inlet holes 200, 210. It is a diagram. The air inlet holes 200, 210 have a lateral offset d. Sky The air inlet holes 200, 210 open tangentially to the internal chamber 230. There is. Depending on the offset d of the air inlet hole 200°210 on the false twisting element 2 , the air inlet hole 10.11 can also open into the injector part l. thread part The effect of the airflow on the rotation is particularly good due to this lateral offset arrangement. be able to.

A plurality of air inlet holes are evenly distributed around the injector part l and the false twisting element. It is particularly preferable that the A preferred arrangement is at least 4, more preferably Eight air introduction holes are provided. The larger the number of holes, the smaller the cross-sectional area; The final number of holes is limited. Due to the large number of false twisting elements 2, for the generation of false twists. This is suitable for transmitting energy to the thread.

In FIG. 4, reference numerals 110 and 120 indicate a pair of inlet rollers of the draft mechanism. vinegar The driver passes through the preliminary draft area 13 and picks up two adjacent strips on the apron vs. 16 and 17. Enter between Toland. This apron 16, 17 has a bottom apron roller 14 and an upper part. The apron roller I5 is further guided around the deflection bodies 18, 19, 37, and 38. Ru.

The deflection bodies 18.19 are carried at the ends of the adjacent strands of the apron 16.17. A deflection body 37, 38 and an erected body located in direction F and laterally spaced therefrom. In cooperation with the prong roller 14.15, a relatively sharp Ensure that the angles α and β are such that the exit of the double apron belt guiding means is connected to the delivery roller It is placed at a population nip of 20.21.

The main draft area of the illustrated draft mechanism consists of a pair of apron rollers 14°15 and a feeder. It is located between the output roller pair 20 and 21.

The capacitor 26 is connected to the nip line 23 of the pair of delivery rollers 20 and 21 and the double apron bench. located between the outlets of the route guide means 16.17.18.19. There is a capacitor small enough to fit into the available residual space, and with an eprop as shown in Figure 5. As shown in FIG. The delivery roller 20.21 is arranged complementary to the surface portion of the delivery roller 20.21. are opposed with respect to their surfaces facing the delivery roller 20.21. capacitor The apron 16, 17 of 26 has a substantially triangular shape, and the transition body 1 8.19 substantially conforming to the form of the guiding surface 24.25 and extending around the periphery of the transition body. The apron 26,27 is guided at, forming acute wrap angles α, β. There is.

Importantly, the capacitor 26 is mounted on the circumference of the bottom delivery roller 20; A small distance 29 is provided to the delivery roller 21. Thus The capacitor 26, which is preferably constructed from a low-friction plastic material, is commonly is placed only on the bottom delivery roller 20 made of metal, where the capacitor 26 can slide with slight friction, while the upper delivery roller made of rubber Contact with the roller 21 is prevented. In this way, undesirable wear of the upper delivery roller and damage can be prevented.

The bottom rollers 110.14.20 are constructed of metal, in particular hardened steel, but opposite The rollers 120.15.21 are made of an elastic member such as rubber.

Thus, the nip line 23 of the delivery roller 20.21 and the double apron guiding means 16.17.18.19 The minimum space provided between the exit and the It can be used as a housing for storing a capacitor. Here 1. con The capacitor is funnel-shaped on the inlet side and its slot 35 connects to the bottom delivery roller 20. A slot 35 is formed which opens into the bottom delivery roller 20 on the facing side.

Conventional suction means are provided in the form of a duct 34 extending perpendicularly to the axis of the rollers. It is provided below the draft mechanism shown in FIG.

Drafting means are described in German Patent Application No. 4230314 of September 1992. Sea urchins are provided. It is possible to install a capacitor in the preliminary draft area, and this Regarding this, EP-A-449073 or its improvement 1, 992.9 It is disclosed in German Patent Application No. 4230317 of May IO.

These capacitor mechanisms span the width of the fiber stream exiting the draft mechanism. This allows very good control without compromising the drafting of the sliver. This expansion is This can be done well with the apron device in EP-A-440361, which This point is disclosed in U.S. Patent Application No. 5N081010265, filed January 28, 1993. has been done. The contents of these applications shall be made part of this application.

The influence of each element of this system is shown in more detail in diagrams 6 to 11. Explained by Ram. These simplified diagrams cover the entire spinning process. Only a short portion of the channel is shown, i.e. at the exit of the draft mechanism. from the “fiber delivery position” (Fig. 6) to the exit of the false twisting element 2. Each figure represents the progress to the spun yarn (Figure 11). The diagram is They are arranged to explain the various functions. The scale, including the relationship between Well, it's different from reality.

Line K (FIG. 6) represents the nip line at the exit of the draft mechanism. Inji The entrance to the vector section 1 is represented in cross section. Fiber F supplied by draft mechanism most of which forms the yarn core GK. The two fibers Fl and F2 are not heated to the core and are As mentioned above, in the course of the process, it becomes a "cover fiber."

The “advancing” part (“head”) of one cover fiber F1 is moved by the tension of the air stream S. It is introduced directly into the injector section l. The head of the second cover fiber F2 is temporarily It does not fall into part l. However, the “back ends” of the two threads are gathered at the core. (otherwise it would be lost as fluff). Immediately after that, the state shown in FIG. 7 occurs.

Due to the tension caused by the air flow, the fiber Fl reaches the "inclusion point" in the direction of movement of the yarn core GK. Extends from El. Fiber F2 extends in the opposite direction from its point of inclusion and extends in the injector section. It is drawn into the nozzle along the edge. cover fibers to achieve a uniform yarn structure must be parallel to each other.

Downstream of the inlet, inclusion points El and F2 are holes (air inlet) 10.11 (8th and Figure 9). In Figure 8, fiber F2 is still being transported. (Assume that the head is backward). However, the inclusion point E2 makes the air inlet extremely slow. After passing through, the fiber F2 is turned over under the influence of the compressed air flow, and its head is , the same as the fiber Fl, now directed forward (FIG. 9).

Up to this point, we have made the very simple assumption that the yarn core is located at the center of the nozzle duct. Was. However, the yarn core GK rotates around the longitudinal axis of the duct and As a result, a kind of "balloon" (Fig. 1O) is formed within the duct. This yarn core GK and the cover fibers slide along the inner surface Fl of the duct. Thread around the axis of the duct Each rotation of the core causes the cover fibers to rotate approximately one revolution around the yarn core. injector Up to the outlet AG of part l, each covering fiber serves for the covering over its entire length. It is designed to cover the yarn core.

The conditions within the false-twisted member 2 (FIG. 11) will be different. The fiber structure is already filled here. It has undergone considerable heating and therefore has a solid structure. This solid The structure is now transformed into a helix by the newly introduced air flow. The airflow itself A vortex W is formed within the heating element 2, and energy is transferred from this vortex to the yarn helix. It will be done. The rotation of the thread section about the longitudinal axis of the duct is This creates the above-mentioned false twist rotation in the yarn core, which is essentially the spinning of the draft mechanism. Continue until the out triangle. (Due to the fact that it is false twisting, downstream of false twisting element 2, Then, the heating is turned off again. However, this point is not the subject of this invention. Therefore, detailed explanation will be omitted here. ) In order to drive the helix, it is necessary that the air flow does not act on the helix in a certain area. be. (False twisting element 2) What is required in this area is that the most uniform vortex is generated. , the maximum amount of energy is transferred from the vortex to the thread section. however, This process is influenced by the following factors: On the other hand, the air vortex gradually weakens due to friction on the inner wall of the false twisting element 2. to become; On the other hand, the friction between the thread part and its inner surface inhibits the rotation of the thread part: subject to restrictions.

Therefore, the actual effect of the false twisting element (well, it is necessary for winding the fibers) The area Q′Ji is actually shorter than the area of the injector part l, which is the key point (on the contrary) A draft mechanism (two) is provided depending on the direction of rotation on the yarn core.

The present invention is limited to the embodiments illustrated herein. continuation of page (31) Priority claim number P4230317.6 (32) Priority date September 1992 April 10th (33) Priority claim country Germany (DE) (31) Priority claim number 01 0,265 (32) Priority date: January 28, 1993 (33) Priority claim country: United States (US) (81) Specified times EP (AT, BE, CH, DE.

DK, ES, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE) ,JP,US

Claims (13)

[Claims] 1. It has a draft mechanism and a pneumatic false twisting device located immediately after the draft mechanism. , the false twisting device has an intermediate space between the injector part (1) and the injector part (1). and a false-twisting element (2) located close to each other through a false-twisting element (2); The inner diameter of the opening (2) is expanded into a shoulder shape, and the air inlet (20, 21) is connected to the false twisting element ( 23) is opened to the internal chamber (23) immediately after the shoulder-shaped enlarged part of the inner diameter. In the sliver spinning device, the false twisting element (2) is connected to the injector section (1). The length of the false twisting element is chosen to allow for the formation of spiral threads. A sliver spinning device characterized in that: 2. The injector part (1) has a cylindrical inner diameter which remains substantially constant. The spinning device according to claim 1, characterized in that: 3. The expanded inner diameter (D) of the false twisting element (2) is equal to the inner diameter (A) of the injector part (1). ) according to claim 1 or 2, which is equal to or smaller than Device. 4. The expanded inner diameter (D) of the false twisting element (2) should be 2.2 to 2.8 mm. The device according to any one of claims 1 to 3, characterized in that: 5. The false twisting element (2) has an expanded inner diameter (D) immediately after the shoulder, relative to the length (L). in a ratio of 1:6 to 1:16, preferably 1:12 to 1:14. 5. The device according to any one of claims 1 to 4. 6. The distance (b) between the shoulder-like widening of the air inlet holes (20, 21) is the length of the false twisting element. from claim 1, characterized in that it is equal to or less than the shoulder height (c) of 5. The device according to any one of 5. 7. The distance of the air inlet holes (20, 21) of the false twisting element (2) from the shoulder expansion part Claim 1 characterized in that the separation (b) is equal to or smaller than 0.5 mm. 6. The device according to any one of 6 to 6. 8. The air inlet holes (20, 21) are arranged in a projection relative to the axis of the false-twisting element (2). According to any one of claims 1 to 7, the structure forms a right angle β. equipment. 9. The axes of the air inlet holes (10, 11) are aligned with the axis of the injector part (1). Any of claims 1 to 8, characterized in that it forms an angle α of approximately 30° in the shadow. The device described in any of the above. 10. The air inlet holes (10, 11; 20, 21) are connected to the injector part and/or substantially tangential to the internal chamber (12, 23) of the false-twisting element (2) 10. The device according to any one of claims 1 to 9, characterized in that the device is open to. 11. The air inlet holes (10, 11) are connected to the injector part (1) and/or the false twisting part. The element (2) is located in an open position outward relative to the chamber (12; 23). Apparatus according to any one of claims 1 to 10, characterized in that: 12. Three or more (preferably four or more) air inlet holes (10, 11; 20, 21) is the injector part (1) and/or the false twisting element (2 ) are provided evenly distributed on the horse. The device described in any of the above. 13. The width (B) of the sliver coming out of the draft mechanism is the width of the injector part (1). According to any one of claims 1 to 12, the diameter is wider than the inner diameter (A). Device.