A tooth back stepped doffer card clothing and its application

Abstract

A new type of stepped doffer card clothing with tooth back, comprising a flat belt-shaped base, needle teeth all arranged on the base, wherein two adjacent needle teeth are smoothly connected by a first concave arc line, the needle teeth comprise a tooth front portion and a tooth back portion, the tooth back portion comprises a first tooth back line and a raised portion arranged on the first tooth back line, and the raised portion is formed by connecting n stepped raised portions, wherein n≥1. In the technical solution, by arranging stepped raised portions on the tooth back portion, the side surface area of ​​the needle teeth is increased, thereby increasing the contact area between the needle teeth and the fiber, increasing the friction between the needle teeth and the fiber, improving the ability of the doffer card clothing to grab and hold the fiber from the cylinder card clothing, reducing the process of repeated combing of the fiber, improving the uniformity of the fiber web surface, reducing the phenomenon of inlay and winding of the fiber web surface, improving the yield rate of the fiber web, and improving the working efficiency of the combing process.

Description

Technical Field

[0001] The invention belongs to the field of textile technology, and particularly relates to a tooth-back stepped doffer card clothing and application thereof. Background Art

[0002] Card clothing is a covering of various carding parts with needles or teeth on the surface, and is one of the important parts of spinning. According to the position distribution of card clothing in the carding machine, card clothing can be divided into licker-in card clothing, carding plate card clothing, cylinder card clothing, rear fixed flat card clothing, movable flat card clothing, front fixed flat card clothing and doffer card clothing. The purpose of carding is to remove impurities, reduce cotton knots, improve the parallelism of fibers, improve the uniformity of cotton webs, mix and remove some short fibers. In the process of fiber carding, doffer card clothing plays a very important role.

[0003] The main function of doffer wire is to transfer the separated single fibers from the surface of the cylinder and condense them into a fiber web. The existing doffer wire is mainly composed of a base and the needle teeth planted thereon, and the structure is relatively simple. With the development and application of high-speed and high-yield carding machines and combing machines, especially the production of a large number of chemical fibers and man-made cellulose fibers, the existing doffer wire can no longer meet the requirements of textile equipment and textiles, and cannot comb various fibers well, resulting in a messy fiber web, uneven fiber web surface, and serious intarsia and winding phenomenon, which directly restricts the use of high-speed and high-yield carding machines and combing machines, and reduces work efficiency. Summary of the invention

[0004] In order to solve the above-mentioned technical problem, the present invention provides a doffer needle cloth with a stepped tooth back, comprising a flat belt-shaped base, a plurality of needle teeth all arranged on the base, wherein two adjacent needle teeth are smoothly connected by a first concave arc line, the needle tooth comprises a tooth front portion and a tooth back portion, the tooth back portion comprises a first tooth back line and a raised portion arranged on the first tooth back line, and the raised portion is formed by connecting n stepped raised portions, wherein n≥1.

[0005] Preferably, one end of the protrusion is smoothly connected to the first tooth back line through the second concave arc line, and the other end is connected to the first concave arc line.

[0006] Preferably, the two adjacent protrusions are smoothly connected by a third concave arc line.

[0007] Preferably, a first tooth back angle is formed between the first tooth back line and the base, and the angle of the first tooth back angle is 10-50°.

[0008] Preferably, the stepped protrusion includes a first constituent line parallel to the base, a second constituent line smoothly connected to the first constituent line via a first convex arc line, a second tooth back angle is formed between the second constituent line and the base, and the angle of the second tooth back angle is 10-50°.

[0009] Preferably, the length of the first constituent line is 0.05-1.5 mm, and the height of the stepped protrusion is 0.2-2 mm.

[0010] Preferably, the tooth front portion includes a first tooth front line and a second tooth front line, one end of the second tooth front line intersects with the first tooth front line to form a tooth tip angle, and the other end is connected to the first tooth back line, and the tooth tip angle is 10-50°.

[0011] Preferably, the first tooth front line is smoothly connected to the first concave arc line, and a working angle is formed between the first tooth front line and the base, and the working angle is 10-50°.

[0012] Preferably, the total height is 3.0-6.0 mm, the tooth depth of the needle teeth is 2.0-3.8 mm, and the tooth pitch between two adjacent needle teeth is 1.5-3.5 mm.

[0013] The tooth-back stepped doffer card clothing of the present invention can be used in the carding of natural fibers and chemical fibers.

[0014] Beneficial effects:

[0015] (1) In the technical solution, by providing a stepped protrusion on the back of the tooth, the side area of ​​the needle teeth is increased, thereby increasing the contact area between the needle teeth and the fiber, increasing the friction between the needle teeth and the fiber, and improving the ability of the doffer needle cloth to grab and hold the fiber from the cylinder needle cloth, reducing the process of repeated combing of the fiber, improving the uniformity of the fiber web surface, reducing the phenomenon of inlay and entanglement of the fiber web surface, improving the yield rate of the fiber web, and improving the work efficiency of the combing process.

[0016] (2) The inventors have been able to balance the holding ability and release ability of the doffer needle cloth by reasonably setting the angles of the first tooth back angle and the second tooth back angle, so that the needle teeth can maintain both good holding ability and good release ability, thereby improving the quality of the fiber web surface.

[0017] (3) The inventors set the width, height and tooth depth of the stepped protrusions, which not only keeps the fiber capacity between two adjacent needle teeth at a good level, but also improves the rolling resistance and the service life of the doffer card clothing.

[0018] (4) The inventors have set a reasonable working angle to better guide the high-speed airflow from the cylinder card clothing to the doffer card clothing, thereby reducing the entanglement of the fiber web.

[0019] (5) The inventors have effectively improved the embedding of the doffer wire by setting the angle of the tooth tip, improved the ability to pierce the fibers and the ability to strip the fibers from the cylinder wire, and improved the transfer rate of the carding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure in Example 1.

[0021] Figure 2 It is a schematic diagram of the overall structure of the first needle tooth and the second needle tooth.

[0022] Figure 3 This is a schematic diagram of the overall structure of the raised portion in Example 1.

[0023] Figure 4 This is a schematic diagram of the overall structure in Example 4.

[0024] Figure 5 This is a schematic diagram of the overall structure in Example 5.

[0025] 1-base, 2-first needle tooth, 3-first concave arc line, 4-first tooth back line, 5-first convexity, 6-second convexity, 7-second concave arc line, 8-third concave arc line, 9-first constituent line, 10-first convex arc line, 11-second constituent line, 12-first tooth front line, 13-second tooth front line, 14-tooth tip angle, 15-second needle tooth, 16-third needle tooth, 17-fourth needle tooth, a1-first tooth back angle, a2-second tooth back angle, a-working angle, b1-length of the first constituent line, b2-length of the third constituent line, h-total height of needle clothing, h1-base height, h2-tooth depth, h3-first convexity height, A-convexity, h4 the height of the first constituent line from the top of the tooth tip angle, p-tooth pitch. DETAILED DESCRIPTION

[0026] The content of the present invention can be more easily understood by selecting the following detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0027] As used herein, the terms "comprises," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0028] When amount, concentration or other value or parameter is expressed as range, preferred range or a series of upper preferred value and lower preferred value limit range, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value and any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when disclosing range "1 to 5", described range should be interpreted as including range "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When numerical range is described in this article, unless otherwise stated, the range is intended to include its end value and all integers and fractions within the range.

[0029] In addition, the indefinite articles "a" and "an" before the elements or components of the present invention have no restrictions on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the number is obviously only referred to in the singular form.

[0030] In order to solve the above-mentioned technical problem, the present invention provides a doffer needle cloth with a stepped tooth back, comprising a flat belt-shaped base, a plurality of needle teeth all arranged on the base, wherein two adjacent needle teeth are smoothly connected by a first concave arc line, the needle tooth comprises a tooth front portion and a tooth back portion, the tooth back portion comprises a first tooth back line and a raised portion arranged on the first tooth back line, and the raised portion is formed by connecting n stepped raised portions, wherein n≥1.

[0031] As a preferred technical solution, one end of the protrusion is smoothly connected to the first tooth back line through the second concave arc line, and the other end is connected to the first concave arc line.

[0032] As a preferred technical solution, the two adjacent protrusions are smoothly connected by a third concave arc.

[0033] The inventors increased the side area of ​​the needle teeth by providing stepped protrusions on the back of the teeth, thereby increasing the contact area between the needle teeth and the fibers, increasing the friction between the needle teeth and the fibers, and improving the ability of the doffer needle cloth to grab and hold the fibers from the cylinder needle cloth, reducing the process of repeated combing of the fibers, and improving the uniformity of the fiber web surface. However, the inventors found that the stepped protrusions hindered the release ability of the fiber web to a certain extent.

[0034] As a preferred technical solution, a first tooth back angle is formed between the first tooth back line and the base, and the angle of the first tooth back angle is 10-50°.

[0035] As a preferred technical solution, a first tooth back angle is formed between the first tooth back line and the base, and the angle of the first tooth back angle is 35-50°.

[0036] As a preferred technical solution, the stepped protrusion includes a first constituent line parallel to the base, a second constituent line smoothly connected to the first constituent line through a first convex arc line, and a second tooth back angle is formed between the second constituent line and the base, and the angle of the second tooth back angle is 10-50°.

[0037] As a preferred technical solution, the stepped protrusion includes a first constituent line parallel to the base, and a second constituent line smoothly connected to the first constituent line through a first convex arc line, a second tooth back angle is formed between the first constituent line and the base, and the angle of the second tooth back angle is 35-50°.

[0038] As a preferred technical solution, the length of the first constituent line is 0.05-1.5 mm, and the height of the stepped protrusion is 0.2-2 mm.

[0039] As a preferred technical solution, the height of the base is 0.5-2 mm.

[0040] The inventors found that by reasonably setting the angle of the first tooth back angle, the angle of the second tooth back angle, the length of the first constituent line and the height of the stepped protrusion, not only can the release ability of the doffer wire on the fiber web be improved, but also the fiber holding ability of the doffer wire can be better maintained, the quality of the fiber web can be improved, and the combing efficiency of the fiber can be improved. The inventors unexpectedly found that the doffer wire in the technical solution also has good holding and releasing capabilities for thinner fibers.

[0041] As a preferred technical solution, the tooth front portion includes a first tooth front line and a second tooth front line, one end of the second tooth front line intersects with the first tooth front line to form a tooth tip angle, and the other end is connected to the first tooth back line, and the tooth tip angle is 10-50°.

[0042] As a preferred technical solution, the tooth front portion includes a first tooth front line and a second tooth front line, one end of the second tooth front line intersects with the first tooth front line to form a tooth tip angle, and the other end is connected to the first tooth back line, and the tooth tip angle is 35-50°.

[0043] As a preferred technical solution, the first tooth front line is smoothly connected to the first concave arc line, and a working angle is formed between the first tooth front line and the base, and the working angle is 10-50°.

[0044] As a preferred technical solution, the first tooth front line is smoothly connected to the first concave arc line, and a working angle is formed between the first tooth front line and the base, and the working angle is 35-50°.

[0045] As a preferred technical solution, the total height is 3.0-6.0 mm, the tooth depth of the needle teeth is 2.0-3.8 mm, and the tooth pitch of two adjacent needle teeth is 1.5-3.5 mm.

[0046] The inventors found that when the fiber capacity between the needle teeth is small, the carding machine will comb the fibers repeatedly for many times, and the combing strength will be too strong, which will cause fiber damage, increase the number of short fibers, and reduce the quality of the fiber web. However, when the fiber capacity between the needle teeth is large, the combing strength will be weak, and the fibers cannot be fully combed. During condensation, fiber knots will be generated due to the excessive thickness of the fiber web layer, resulting in uneven mixing between the fibers. However, the inventors found that by setting the tooth depth and tooth pitch, combined with a certain first tooth back angle, a second tooth back angle, a length of the first constituent line, and a height of the stepped protrusion, the needle teeth can have a relatively appropriate fiber capacity between the teeth, which can improve the fiber transfer rate, reduce the generation of fiber knots, and improve the quality of the fiber web layer.

[0047] The tooth-back stepped doffer card clothing of the present invention can be used in the carding of natural fibers and chemical fibers.

[0048] Example 1

[0049] like Figure 1 , Figure 2 and Figure 3 As shown, in this embodiment, a tooth-back stepped doffer card clothing includes a flat-belt-shaped base 1 and needle teeth all arranged on the base 1. The needle teeth in this embodiment include a first needle tooth 2, a second needle tooth 15, a third needle tooth 16 and a fourth needle tooth 17 connected in sequence. The first needle tooth 2 and the second needle tooth 15 are smoothly connected by a first concave arc line 3. The arc angle corresponding to the first concave arc line 3 is 180°. The first concave arc line 3 corresponding to the arc angle of 180° can increase the fiber capacity between the needle teeth to a certain extent, and because the concave arc line can better hold the fiber, the phenomenon of the fiber net being easy to fall off the net will not occur.

[0050] The first needle tooth 2 includes a tooth front part and a tooth back part, and the tooth back part includes a first tooth back line 4 and a raised part A arranged on the first tooth back line 4, and the raised part A is formed by connecting two stepped first protrusions 5 and second protrusions 6. In this embodiment, the first protrusion 5 and the second protrusion 6 have the same structure. One end of the raised part A is smoothly connected to the first tooth back line 4 through the second concave arc line 7, and the other end is connected to the first concave arc line 3. The first protrusion 5 includes a first constituent line 9 parallel to the base 1 and a second constituent line 11 smoothly connected to the first constituent line 9 through the first convex arc line 10. The arc angle corresponding to the first convex arc line 10 is 60°, and the first protrusion 5 and the second protrusion 6 are smoothly connected through the third concave arc line 8, and the arc angle corresponding to the third concave arc line 8 is 60°. Through the arrangement of the first convex arc line 10 and the third concave arc line 8, the needle tooth is smoother as a whole, the ability of the needle tooth to hold and release fibers is balanced, and the knotting of the fiber web is reduced. A second tooth back angle a2 is formed between the second constituent line 11 and the base 1, and the angle of the second tooth back angle a2 is 50°. A first tooth back angle a1 is formed between the first tooth back line 4 and the base 1, and the angle of the first tooth back angle a1 is 40°. The length b1 of the first constituent line is 1.5 mm, and the height h3 of the first protrusion is 2 mm. The stepped protrusion increases the side area of ​​the needle teeth, thereby increasing the contact area between the needle teeth and the fibers, increasing the friction between the needle teeth and the fibers, improving the ability of the doffer wire to grab and hold the fibers from the cylinder wire, reducing the process of repeated combing of the fibers, and improving the uniformity of the fiber web surface. By setting the angles of the first tooth back angle a1, the second tooth back angle a2, and the sizes of the first constituent line 9 and the second constituent line 11, not only can the doffer wire's ability to release the fiber web be improved, but also the doffer wire's ability to hold the fibers can be better maintained, the quality of the fiber web can be improved, and the combing efficiency of the fibers can be improved. The tooth front portion includes a first tooth front line 12 and a second tooth front line 13, one end of the second tooth front line 13 intersects with the first tooth front line 12 to form a tooth tip angle 14, and the other end is connected to the first tooth back line 4, and the tooth tip angle 14 is 35°. The first tooth front line 12 is smoothly connected with the first concave arc line 3 to reduce the phenomenon of fiber mesh inlay, and a working angle a is formed between the first tooth front line 12 and the base 1, and the working angle a is 45°. When the working angle a is 45°, the doffer card clothing can transfer more fibers from the cylinder card clothing, thereby improving the transfer efficiency of the doffer card clothing.

[0051] The total height of the doffer wire is 6 mm, the tooth depth of the needle teeth is 3.8 mm, the height of the base is 2 mm, and the tooth pitch p between the first needle teeth 2 and the second needle teeth 15 is 3.5 mm. The height of the first constituent line from the top of the tooth tip angle is 0.6 mm. By setting the tooth depth and tooth pitch, combined with a certain angle of the first tooth back angle, the angle of the second tooth back angle, the length of the first constituent line and the height of the stepped protrusion, the needle teeth can have a relatively appropriate inter-tooth fiber capacity, which can improve the fiber transfer rate, reduce the generation of fiber knots, and improve the quality of the fiber web layer.

[0052] The tooth-back stepped doffer wire described in this embodiment can be used in the carding of natural fibers and chemical fibers.

[0053] Example 2

[0054] The difference between this embodiment and the first embodiment is that the length b1 of the first constituent line in this embodiment is 0.05 mm, the first protrusion height h3 is 0.2 mm, the total height of the doffer card clothing is 3 mm, the tooth depth of the needle teeth is 2 mm, the height of the base is 0.5 mm, and the tooth pitch between the first needle teeth 2 and the second needle teeth 15 is 1.5 mm.

[0055] Example 3

[0056] The difference between this embodiment and the first embodiment is that a second tooth back angle is formed between the second constituent line and the base, and the angle of the second tooth back angle is 30°. A first tooth back angle is formed between the first tooth back line and the base, and the angle of the first tooth back angle is 25°. The first tooth front line is smoothly connected with the first concave arc line to reduce the phenomenon of fiber web intarsia, and a working angle is formed between the first tooth front line and the base, and the working angle is 27°.

[0057] Example 4

[0058] like Figure 4 As shown, the difference between this embodiment and embodiment 1 is that the protrusion in this embodiment is the first protrusion 5, one end of the first protrusion 5 is smoothly connected to the first tooth back line 4 through the second concave arc line 7, and the other end is connected to the first concave arc line 3. In this embodiment, the length b1 of the first constituent line is 0.38 mm, and the height h4 of the first constituent line from the top of the tooth tip angle is 0.6 mm. The tooth pitch p between the first needle tooth 2 and the second needle tooth 15 is 2.5 mm. A second tooth back angle a2 is formed between the second constituent line 11 and the base 1, and the angle of the second tooth back angle a2 is 40°. A first tooth back angle a1 is formed between the first tooth back line 4 and the base 1, and the angle of the first tooth back angle a1 is 35°. The first tooth front line 12 is smoothly connected to the first concave arc line 3 to reduce the phenomenon of fiber mesh inlay, and a working angle a is formed between the first tooth front line 12 and the base 1, and the working angle a is 37°. The remaining technical features are the same as those in embodiment 1.

[0059] Example 5

[0060] like Figure 5 As shown, the difference between this embodiment and embodiment 2 is that in this embodiment, the length b1 of the first constituent line is 0.2 mm, and the height h4 of the first constituent line from the top of the tooth tip angle is 1.5 mm.

[0061] The above is only a preferred embodiment of the present invention and is not intended to limit the invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A doffer card clothing with stepped tooth back, characterized in that: It comprises a flat belt-shaped base, a plurality of needle teeth arranged on the base, two adjacent needle teeth are smoothly connected by a first concave arc line, the needle teeth comprise a tooth front portion and a tooth back portion, the tooth back portion comprises a first tooth back line and a raised portion arranged on the first tooth back line, the raised portion is formed by connecting n stepped raised portions, wherein n≥1; One end of the convex portion is smoothly connected to the first tooth back line through the second concave arc line, and the other end is connected to the first concave arc line; Two adjacent protrusions are smoothly connected by a third concave arc line; A first tooth back angle is formed between the first tooth back line and the base, and the angle of the first tooth back angle is 10-50°; The stepped protrusion includes a first constituent line parallel to the base, and a second constituent line smoothly connected to the first constituent line through a first convex arc line, wherein a second tooth back angle is formed between the second constituent line and the base, and the angle of the second tooth back angle is 10-50°; The length of the first constituent line is 0.05-1.5 mm, and the height of the stepped protrusion is 0.2-2 mm.

2. The tooth back stepped doffer wire according to claim 1, characterized in that: The tooth front portion includes a first tooth front line and a second tooth front line, one end of the second tooth front line intersects with the first tooth front line to form a tooth tip angle, and the other end is connected to the first tooth back line, and the tooth tip angle is 10-50°.

3. The tooth back stepped doffer wire according to claim 2, characterized in that: The first tooth front line is smoothly connected to the first concave arc line, and a working angle is formed between the first tooth front line and the base, and the working angle is 10-50°.

4. The tooth back stepped doffer wire according to claim 1, characterized in that: The total height is 3.0-6.0 mm, the tooth depth of the needle teeth is 2.0-3.8 mm, and the tooth pitch between two adjacent needle teeth is 1.5-3.5 mm.

5. A doffer wire with stepped tooth back according to any one of claims 1 to 4 which can be used in the carding of natural fibers and chemical fibers.

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