Hot-melting self-adhesive crochet yarn and preparation method thereof

Abstract

The invention discloses a hot-melt self-adhesive crochet yarn and a preparation method thereof, and belongs to the technical field of textiles. High-strength yarns are used as core warp yarns, and hot melting yarns are used as chaining warp yarns and weft insertion yarns; the core warp does not perform looping motion; the chaining warp yarns are located on two sides of the core warp yarns and looped to form chaining tissues, and crochet yarns are obtained through weft insertion knitting; and then carrying out hot melting treatment to obtain the hot-melting self-adhesive crochet yarn. The hot-melt self-adhesive crochet yarn prepared by the invention is good in shape retentivity and structural stability, simple in preparation process, low in cost, free of influence on hand feeling and the like.

Description

Technical Field

[0001] The invention relates to a hot-melt self-adhesive crochet yarn and a preparation method thereof, belonging to the technical field of textiles. Background Art

[0002] Hot melt fibers are special fibers that soften or melt when heated to a specific temperature; after cooling, these fibers will firmly bond to other yarns to form a stable composite structure. With this feature, hot melt fibers can not only significantly enhance the structural strength of the fabric, but also give the fabric a certain degree of stiffness and shape retention, making it particularly suitable for textile products that require specific shapes, such as hats and trims.

[0003] At present, crochet yarn is a special type of yarn, which is woven by a crochet machine. The fixing methods of crochet yarn include physical reinforcement, chemical reinforcement, biological reinforcement, needle and thread repair, etc. Among them, physical reinforcement is reinforcement through physical means (such as clamping); chemical reinforcement is the use of adhesive reinforcement method, which uses chemical adhesives to enhance the strength and stability of crochet yarn; biological reinforcement includes silk protein reinforcement method, which uses silk protein homologous to crochet yarn as the main reinforcement material, and with the help of additives, relinks the silk fiber peptide chains that are broken due to aging, thereby achieving the purpose of strengthening fragile crochet yarn; needle and thread repair method is to add a layer of fabric on the back or surface of the crochet yarn, and sew two or more layers of fabric by needle and thread to play a role in reinforcing the damaged part or the whole. However, these methods are complicated to operate, have low production efficiency, and are costly. At the same time, the use of chemical and biological bonding may affect the feel, resulting in reduced softness and comfort. In addition, physical reinforcement may cause the yarn to become loose or have more burrs, thus affecting the durability and aesthetics of the yarn.

[0004] Therefore, it is an urgent problem to find a method that has a good fixing effect on the crochet yarn and does not affect its feel and softness. Summary of the invention

[0005] [Technical issues]

[0006] Conventional crochet yarn fixing methods have problems such as complex operation, low production efficiency, high cost, poor hand feel, and low yarn durability and aesthetics;

[0007] Crochet yarns produced by conventional fixing methods have problems with poor shape retention and structural stability.

[0008] [Technical solution]

[0009] In order to solve the above two problems, the present invention provides a hot-melt self-adhesive crochet yarn and a preparation method thereof. Specifically, the present invention uses high-strength yarn as the core warp yarn, and hot-melt yarn as the chain warp yarn and the weft yarn; the core warp yarn does not perform looping movement; the chain warp yarn is located on both sides of the core warp yarn, looping to form a chain structure, and the weft weaving obtains the crochet yarn; and then undergoes a hot-melt treatment to obtain the hot-melt self-adhesive crochet yarn. The hot-melt self-adhesive crochet yarn prepared by the present invention has good shape retention and structural stability, and the preparation process is simple, the cost is low, and it does not affect the hand feel.

[0010] The first object of the present invention is to provide a hot-melt self-adhesive crochet yarn, which uses high-strength yarn as the core warp yarn, and hot-melt yarn as the chain warp yarn and the weft yarn; the core warp yarn does not perform looping movement; the chain warp yarn is located on both sides of the core warp yarn, loops to form a chain structure, and the weft is woven and hot-melt treated to obtain the result.

[0011] In one embodiment of the present invention, the high-strength yarn is one or more of cotton ply yarn, nylon filament, polyester yarn or polypropylene yarn.

[0012] In one embodiment of the present invention, the fineness of the high-strength yarn is 30D-150D to provide good support and durability.

[0013] In one embodiment of the present invention, the twist of the high-strength yarn is 180 to 250 twists / meter to ensure the durability and kink resistance of the yarn.

[0014] In one embodiment of the present invention, the hot-melt yarn is one or more of a low-melting polyester yarn (melting point ranges from 90 to 150° C.), a polyamide yarn, an ethylene-vinyl acetate copolymer yarn, a polypropylene filament, a thermoplastic polyurethane (TPU) yarn, or a biodegradable polylactic acid yarn.

[0015] In one embodiment of the present invention, the fineness of the heat-fusible yarn is 20D-100D to ensure that the yarn has adjusted stiffness and structural stability.

[0016] In one embodiment of the present invention, the cross-sectional shape of the thermofusible yarn is one of a circle, a cross, a triangle or an H shape, which is used to control the gloss and touch of the yarn surface.

[0017] In one embodiment of the present invention, the root number ratio of the core warp yarn to the chain warp yarn is 40-80:20-60, so as to control the stiffness and hand feel of the crochet yarn.

[0018] In one embodiment of the present invention, the combined structure of the core warp yarns, the chain warp yarns and the weft insertion yarns may be 1×1×4.

[0019] In one embodiment of the present invention, the hot melt treatment is a heating treatment at 110-150° C. for 30-90 seconds to ensure the bonding effect, and a stable crochet yarn structure is formed after cooling; to ensure that the hot melt fibers are uniformly solidified and the structural strength is enhanced.

[0020] In one embodiment of the present invention, the yarn is cooled after the hot melt treatment. The cooling can be done by natural cooling or cold air drying to solidify the yarn shape, and a natural protective film is formed on the surface to improve the wear resistance and touch.

[0021] A second object of the present invention is to provide a method for preparing a hot-melt self-adhesive crochet yarn, comprising the following steps:

[0022] High-strength yarn is used as core warp yarn, and hot-melt yarn is used as chain warp yarn and weft yarn; the core warp yarn does not make looping motion; the chain warp yarn is located on both sides of the core warp yarn, looping to form a chain weft structure, and weaving with weft to obtain crochet yarn;

[0023] The crochet yarn is subjected to heat-melting treatment and cooled to obtain a heat-melting self-adhesive crochet yarn.

[0024] In one embodiment of the present invention, the high-strength yarn is one or more of cotton ply yarn, nylon filament, polyester yarn, polypropylene yarn or high-strength polyamide fiber.

[0025] In one embodiment of the present invention, the fineness of the high-strength yarn is 30D-150D to provide good support and durability.

[0026] In one embodiment of the present invention, the twist of the high-strength yarn is 180 to 250 twists / meter to ensure the durability and kink resistance of the yarn.

[0027] In one embodiment of the present invention, the hot-melt yarn is one or more of low-melting polyester yarn, polyamide yarn, ethylene-vinyl acetate copolymer yarn, polypropylene filament, thermoplastic polyurethane (TPU) yarn or biodegradable polylactic acid yarn.

[0028] In one embodiment of the present invention, the fineness of the heat-fusible yarn is 20D-100D to ensure that the yarn has adjusted stiffness and structural stability.

[0029] In one embodiment of the present invention, the cross-sectional shape of the thermofusible yarn is one of a circle, a cross, a triangle or an H shape, which is used to control the gloss and touch of the yarn surface.

[0030] In one embodiment of the present invention, the root number ratio of the core warp yarn to the chain warp yarn is 40-80:20-60, so as to control the stiffness and hand feel of the crochet yarn.

[0031] In one embodiment of the present invention, the combined structure of the core warp yarn, the weft yarn and the chain warp yarn is 1×4×1, and the needle arrangement is 1×4×1.

[0032] In one embodiment of the present invention, the hot melt treatment is a heating treatment at 110-150° C. for 30-90 seconds to ensure the bonding effect, and a stable crochet yarn structure is formed after cooling; to ensure that the hot melt fibers are uniformly solidified and the structural strength is enhanced.

[0033] In one embodiment of the present invention, the hot melt treatment is followed by cooling, wherein the cooling is natural cooling to solidify the yarn form and form a natural protective film on the surface to improve wear resistance and touch.

[0034] The third object of the present invention is to provide a method for improving the shape retention and structural stability of crochet yarn without affecting its feel, comprising the following steps:

[0035] High-strength yarn is used as core warp yarn, and hot-melt yarn is used as chain warp yarn and weft yarn; the core warp yarn does not make looping motion; the chain warp yarn is located on both sides of the core warp yarn, looping to form a chain weft structure, and weaving with weft to obtain crochet yarn;

[0036] The crochet yarn is subjected to heat-melting treatment and cooled to obtain a heat-melting self-adhesive crochet yarn.

[0037] The fourth object of the present invention is the use of the hot-melt self-adhesive crochet yarn of the present invention in the field of preparing industrial textiles.

[0038] In one embodiment of the present invention, the industrial textiles include outdoor clothing, packaging bags, hats, etc.

[0039] A fifth object of the present invention is to provide a hat, which uses the hot-melt self-adhesive crochet yarn of the present invention.

[0040] [Beneficial Effects]

[0041] (1) The present invention adopts hot-melt yarn, which can not only firmly bond with the core warp yarn after heat treatment, significantly improving the firmness of the crochet yarn and reducing the burr problem, but also effectively improve the stiffness and shape retention of the crochet yarn, forming a fabric with a strong three-dimensional effect.

[0042] (2) The present invention uses hot-melt yarns. The self-adhesive properties of the hot-melt yarns simplify or omit the subsequent reinforcement process, saving production time and cost.

[0043] (3) The present invention can flexibly control the feel of the crochet yarn by adjusting the addition ratio of the hot-melt yarn, thereby meeting the stiffness requirements while taking into account the softness and comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Schematic diagram of the structure of hot-melt self-adhesive crochet yarn; 1 is the chain warp yarn; 2 is the core warp yarn; 3 is the weft yarn. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present invention are described below. It should be understood that the embodiments are for better explaining the present invention and are not used to limit the present invention.

[0046] The raw materials used in the examples are:

[0047] Polyester hot melt yarn: melting point 110℃, 80D; purchased from Nantong Yiheng New Materials Co., Ltd.; cross section is circular;

[0048] Cotton yarn: Cotton double yarn, 80D, twist 200 twists / m.

[0049] Example 1

[0050] A method for preparing a hot-melt self-adhesive crochet yarn comprises the following steps:

[0051] Cotton strands are used as core warp yarns, polyester hot melt yarns are used as chain warp yarns and weft yarns; the combined structure of core warp yarns, weft yarns and chain warp yarns is 1×4×1; the needle arrangement design is 1×4×1;

[0052] The core warp yarn does not make looping motion; the chain warp yarn is located on both sides of the core warp yarn, looping to form a chain weave, and weft weaving to obtain a crochet yarn (structure such as Figure 1 );

[0053] The crochet yarn is subjected to a heat-melting treatment at 110° C. for 60 seconds and cooled naturally to obtain a heat-melting self-adhesive crochet yarn;

[0054] The core warp yarn used is a cotton strand, which does not perform looping motion and does not participate in looping because its main function is to provide softness and internal support for the yarn; the cotton strand itself is soft and has certain moisture absorption and air permeability;

[0055] The non-looped arrangement of the cotton strands helps to reduce the longitudinal rigidity of the yarn, so that the crochet yarn has a certain flexibility while maintaining its shape, which is more suitable for applications that require close fitting or high comfort.

[0056] Keeping the cotton strands in the center without looping can optimize the wrapping effect of the polyester hot-melt yarn, ensuring that the polyester hot-melt yarn is tightly bonded to the cotton strands after heating, achieving higher structural stability and durability; providing softness and basic support;

[0057] After the hot melt treatment, the chain warp polyester hot melt yarn and the weft polyester hot melt yarn are bonded to tightly wrap the core yarn cotton strands, significantly improving the structural stability and wear resistance of the crochet yarn, and giving the crochet yarn good shape retention and stiffness after cooling;

[0058] The 1×4×1 needle row design is adopted to achieve the tightness and surface finish of the crochet yarn, which is suitable for a variety of fabric design requirements;

[0059] The heat-melting treatment is to make the polyester hot-melt yarn fully melted and evenly adhered to the surface of the core warp yarn;

[0060] Natural cooling solidifies the crochet yarn and forms a protective film on the surface, further improving wear resistance and stability.

[0061] The prepared hot-melt self-adhesive crochet yarn has moderate stiffness, stable structure, and is not easy to loosen. It can be widely used in outdoor clothing, bags, hats and other products with high requirements for shape retention and durability; and the surface has a dot pattern.

[0062] The properties of crochet yarn before and after hot melting are as follows:

[0063] Table 1 Performance changes before and after hot melt treatment

[0064] Performance Indicators Before hot melt treatment After hot melt treatment Changes Yarn stiffness (mN·cm2) 3.8 5.8 Improved rigidity and easier shaping Surface pattern uniformity Uneven, sparse distribution Uniform and obvious spots The surface is smoother and the pattern is clearer Hot melt bonding strength (N) 0.0 (unprocessed) 2.5 Significantly enhances yarn structure stability

[0065] Comparative Example 1

[0066] If both the core warp yarn and the chain warp yarn are looped, it may cause the internal structure of the crochet yarn to be too tight, affecting the overall softness and feel.

[0067] Comparative Example 2

[0068] Without a core warp yarn, you may end up with a crochet yarn that doesn't have good support and durability.

[0069] Comparative Example 3

[0070] Without the weft insert, poor bonding of the crochet yarn may result.

[0071] Comparative Example 4

[0072] Without the chain warp yarn, it may cause the yarn of the crochet yarn to become loose.

[0073] Comparative Example 5

[0074] When the ratio of core warp yarn to chain warp yarn is 90:10, the hand feel is too hard;

[0075] When the root number ratio of core warp yarn to chain warp yarn is 30:70, the stiffness is insufficient.

[0076] Comparative Example 6

[0077] Lowering the heat-melting treatment temperature from 110° C. in Example 1 to 100° C. or raising it to 120° C. will result in the hot fuse not being fully melted or being excessively melted.

[0078] When the temperature is too low (such as 100°C), the hot melt wire does not adhere sufficiently, the dot pattern on the yarn surface is not obvious, the structure is not tight enough, and the wear resistance is reduced.

[0079] When the temperature is too high (such as 120°C), the hot melt wire may melt excessively and may penetrate into the core warp yarn, causing the yarn to become hard and brittle as a whole, affecting the feel and durability.

[0080] Comparative Example 7

[0081] Shortening the hot melt treatment time from 60 s in Example 1 to 30 s or extending it to 120 s will affect the uniform bonding of the hot melt wire.

[0082] When the processing time is too short (30s), the hot melt wire has not been fully melted or adheres unevenly, and the local structure of the yarn is loose.

[0083] When the treatment time is too long (120s), the thermal fuse may be overheated and degraded, causing the yarn surface to lose its finish or become brittle, and its durability is reduced.

[0084] Comparative Example 8

[0085] Changing the fineness (denier) of the polyester hot melt yarn significantly deviates from the appropriate range (20D-100D).

[0086] If the hot melt yarn is too coarse, the bonding layer formed after melting will be too thick, resulting in increased rigidity of the yarn and decreased softness and air permeability.

[0087] If the hot melt yarn is too fine, the bonding layer will be weak, the dot pattern will be uneven, the structural stability will decrease, and the yarn will easily become loose and worn.

[0088] Comparative Example 9

[0089] The pin header design is changed from 1×4×1 in Example 1 to 1×3×1 or 1×5×1.

[0090] When the density is reduced (such as 1×3×1), the yarn surface structure is not tight enough, the hot melt wire is difficult to form a uniform surface pattern, and the overall strength and wear resistance are reduced.

[0091] When the density is increased (such as 1×5×1), the yarn surface is too dense, the weaving stretchability is weakened, and the hand feel is hard, which affects the comfort and aesthetics of the fabric.

[0092] Comparative Example 10

[0093] After hot melt treatment, natural cooling is not adopted, but rapid cooling method (such as forced air cooling or water cooling) is selected.

[0094] Rapid cooling results in insufficient crystallization of the surface of the hot melt wire on the moving wheel, and the polyester adhesive layer is relatively fragile. The yarn is prone to loosening, pilling or surface cracks in subsequent use, making it difficult to achieve good shape retention and stiffness.

[0095] Comparative Example 11

[0096] The core warp yarn is changed from cotton ply yarn to other more rigid yarn (such as high-strength synthetic fiber yarn).

[0097] Excessive rigidity causes the crochet yarn to lack appropriate softness and comfort as a whole. The surface of the crochet yarn feels stiff and has poor resilience, which makes it unsuitable for end products that require emphasis on flexibility and wearing comfort.

[0098] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A hot-melt self-adhesive crochet yarn, characterized in that: The hot-melt self-adhesive crochet yarn uses high-strength yarn as the core warp yarn, and hot-melt yarn as the chain warp yarn and the weft yarn; the core warp yarn does not perform looping movement; the chain warp yarn is located on both sides of the core warp yarn, loops to form a chain structure, weft weaving, and hot-melt treatment to obtain it.

2. The hot-melt self-adhesive crochet yarn according to claim 1, characterized in that: The high-strength yarn is one or more of cotton yarn, nylon filament, polyester yarn or polypropylene yarn.

3. The hot-melt self-adhesive crochet yarn according to claim 1, characterized in that The fineness of the high-strength yarn is 30D-150D; the twist of the high-strength yarn is 180 to 250 twists / m.

4. The hot-melt self-adhesive crochet yarn according to claim 1, characterized in that The hot-melt yarn is one or more of low-melting-point polyester yarn, polyamide yarn, ethylene-vinyl acetate copolymer yarn, polypropylene filament, thermoplastic polyurethane (TPU) yarn or biodegradable polylactic acid yarn.

5. The hot-melt self-adhesive crochet yarn according to claim 1, characterized in that The fineness of the hot-melt yarn is 20D-100D, and the cross-sectional shape of the hot-melt yarn is one of a circle, a cross, a triangle or an H shape.

6. The hot-melt self-adhesive crochet yarn according to claim 1, characterized in that The root number ratio of core warp yarn and chain warp yarn is 40-80:20-60.

7. A method for preparing the hot-melt self-adhesive crochet yarn according to any one of claims 1 to 6, characterized in that: The steps include: High-strength yarn is used as core warp yarn, and hot-melt yarn is used as chain warp yarn and weft yarn; the core warp yarn does not make looping motion; the chain warp yarn is located on both sides of the core warp yarn, looping to form a chain weft structure, and weaving with weft to obtain crochet yarn; The crochet yarn is subjected to heat-melting treatment and cooled to obtain a heat-melting self-adhesive crochet yarn.

8. A method for improving the shape retention and structural stability of crochet yarn without affecting its feel, characterized in that: The steps include: High-strength yarn is used as core warp yarn, and hot-melt yarn is used as chain warp yarn and weft yarn; the core warp yarn does not make looping motion; the chain warp yarn is located on both sides of the core warp yarn, looping to form a chain weft structure, and weaving with weft to obtain crochet yarn; The crochet yarn is subjected to heat-melting treatment and cooled to obtain a heat-melting self-adhesive crochet yarn.

9. Use of the hot-melt self-adhesive crochet yarn according to any one of claims 1 to 6 in the field of preparing industrial textiles.

10. A hat, characterized in that: The hot-melt self-adhesive crochet yarn according to any one of claims 1 to 6 is used.

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