Polypropylene-viscose-hemp fiber blended mattress spring wrapping cloth and preparation method thereof

Abstract

The present invention provides a polypropylene-viscose-linen fiber blended mattress spring wrap and a preparation method thereof, which belong to the field of non-woven fabrics. The preparation method of the polypropylene-viscose-linen fiber blended mattress spring wrap comprises the following steps: opening and mixing, carding, laying nets, needle punching reinforcement, and post-processing. The polypropylene-viscose-linen fiber blended mattress spring wrap and the preparation method thereof of the present invention can not only realize the concept of green and sustainable development, but also improve the mechanical properties and corrosion resistance of the mattress spring wrap while improving the anti-aging performance of the non-woven fabric; at the same time, in the preparation process of the blended mattress spring wrap, it can effectively avoid the problems of difficult-to-control entanglement state, poor blending uniformity, difficult-to-control soft and hard style, and unstable overall performance of the mattress spring wrap caused by inconsistent raw material fiber characteristics; effectively avoid fiber breakage during the carding process, and avoid fiber adhesion during the laying net process, thereby improving the preparation yield of the mattress spring wrap.

Description

Technical Field

[0001] The invention relates to the field of non-woven fabrics, in particular to a polypropylene-viscose-hemp fiber blended mattress spring wrapping cloth and a preparation method thereof. Background Art

[0002] The raw material of non-woven fabric is generally 100% polypropylene non-woven fabric, but the use of 100% polypropylene non-woven fabric has the following problems: polypropylene fiber is derived from a by-product of petroleum, is a non-renewable resource, and is not easy to degrade, which is not conducive to the development of the current green and sustainable development concept of the industry; and 100% pure PP polypropylene non-woven fabric is easy to age and has a short service life.

[0003] To address these issues and achieve resource recycling, the most common method currently used is to blend other aging-resistant fibers into the nonwoven fabric. However, while this blending of fibers can improve the nonwoven fabric's aging resistance and extend its service life to a certain extent, it can also reduce the mechanical properties and corrosion resistance of the nonwoven fabric as mattress spring wrap. Currently, there is no method that can achieve the concept of green and sustainable development while simultaneously improving the aging resistance of the nonwoven fabric and its mechanical properties and corrosion resistance as mattress spring wrap.

[0004] To address the aforementioned drawbacks, the inventors analyzed that the existing manufacturing processes for using polypropylene non-woven fabric as mattress spring wrapping primarily involve spunbonding and needle-punching. Because polypropylene non-woven fabric is not resistant to light, it easily corrodes and pulverizes under exposure to light, resulting in an extremely short service life. Furthermore, the material has a very low melting point (approximately 150-160°C), making welding temperatures difficult to control during the manufacturing process. Even slightly elevated temperatures can easily cause melting, severely weakening the non-woven fabric's mechanical properties. The existing mattress spring bag manufacturing process involves pushing springs into the mattress spring wrapping, which is then bonded using an infrared heating welder, under natural light. Because the springs exert longitudinal and lateral forces within the mattress spring wrapping, the mechanical properties of the mattress spring wrapping are extremely demanding. Corrosion and pulverization, or welding melting, can easily lead to cracking of the wrapping, exposing the springs.

[0005] Furthermore, the inventors discovered through experiments that when mixing non-woven fibers with other ageing-resistant fibers, due to the inconsistent properties of the raw materials (such as stiffness, shrinkage, breaking properties, and melting point), the entanglement between the raw materials is difficult to control, resulting in poor blend uniformity, difficulty controlling the softness and hardness, and unstable overall performance of the mattress spring cover. Furthermore, the fibers are prone to breakage during the combing process, making combing difficult. Furthermore, due to the inconsistent water absorption properties of the raw materials, highly absorbent fibers tend to absorb moisture from the air during the web laying process, leading to fiber adhesion and a low yield rate for the mattress spring cover. Summary of the Invention

[0006] In order to solve the technical problems existing in the prior art, the present invention provides a polypropylene-viscose-linen fiber blended mattress spring covering and a preparation method thereof, which can realize the concept of green and sustainable development, and can improve the mechanical properties and corrosion resistance of the mattress spring covering while improving the anti-aging performance of the non-woven fabric; at the same time, in the preparation process of the polypropylene-viscose-linen fiber blended mattress spring covering, it can effectively avoid the problems of difficult to control the entanglement state, poor blending uniformity, difficult to control the soft and hard style, and unstable overall performance of the mattress spring covering caused by inconsistent raw material fiber properties; effectively avoid fiber breakage during the carding process and fiber adhesion during the laying process, thereby improving the preparation yield of the mattress spring covering.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0008] A method for preparing polypropylene-viscose-hemp fiber blended mattress spring covering comprises the following steps: raw material preparation, cleaning and mixing, carding, web laying, needle punching and reinforcement, and post-processing.

[0009] The method for preparing the raw materials is to select fibers of the following specifications as raw fibers:

[0010] Polypropylene fiber, fineness 2.5-3.5D, length 70-76mm, fiber breaking strength 4.5-5CN / dtex, fiber breaking elongation 40-50%;

[0011] Cotton-type viscose fiber, fineness 5.5-6D, length 51-64mm, fiber breaking strength 1-2CN / dtex, fiber breaking elongation 30-35%;

[0012] Natural hemp fiber, fineness is 15-20D, length is 30-40mm, fiber breaking strength is 3-3.5CN / dtex, fiber breaking elongation is 0-5%.

[0013] Preferably, the polypropylene fiber has a fineness of 3D, a length of 76 mm, a fiber breaking strength of 4.7 CN / dtex, and a fiber breaking elongation of 45%.

[0014] Cotton-type viscose fiber, fineness is 5.5D, length is 51mm, fiber breaking strength is 1.5CN / dtex, and fiber breaking elongation is 32%.

[0015] Natural hemp fiber, with a fineness of 15D, a length of 30mm, a fiber breaking strength of 3.2CN / dtex, and a fiber breaking elongation of 2.5%.

[0016] The method for opening and cleaning and mixing is as follows: polypropylene fiber, cotton viscose fiber and natural hemp fiber are opened by an opening and cleaning machine at a weight ratio of 65-70:20-23:10-12 and then enter a mixing box, after which the fibers are evenly mixed in the mixing box and then picked, and then finely opened and mixed to obtain the mixed fiber after opening and cleaning.

[0017] In the blowroom mixing process, the flat curtain running speed is controlled to be 1.5-2m / min, the inclined curtain running speed is 5-6m / min, and the cotton averaging running speed is 100-110m / min;

[0018] During the fine opening process, the cotton suction speed is controlled at 100-105m / min, the wind speed is 100-105m / min, and the cotton roller speed is 120-130m / min.

[0019] The carding method is to feed the mixed fiber after cleaning into a carding machine for carding, and control the fiber feeding amount of the carding machine to be 23-25g / m 2 , the line speed is 40-45m / min (the line speed opening of the carding machine is 28-32%), the chest cylinder speed is 370-390m / min, the main cylinder speed is 1100-1200m / min, the upper and lower doffer speeds are 105-115m / min, and the carded mixed fiber is obtained.

[0020] The web laying method comprises the following steps: passing the carded mixed fibers into a web laying machine for web laying, controlling the number of web laying layers to be 3-4 layers, the web laying width to be 3.8-4 m, the web laying output speed to be 3-3.5 m / min, the web laying tension to be 0.7-0.9%, and the web laying overlap width to be 100-120 mm, thereby obtaining a mixed cotton web with a width of 3.8-4 m.

[0021] The needle punching reinforcement method is to pass the mixed cotton web into a needle punching machine and perform three needle punching reinforcement processes to obtain a grey cloth with a mixed cotton web width of 3.5-3.7m, a smooth surface and good uniformity.

[0022] Furthermore, in the acupuncture reinforcement, in the first acupuncture process, the working width of the acupuncture machine is controlled to be 3.7-3.9m, the needle density is 1500-1600 pieces / m, the acupuncture frequency is 400-500 times / min, and the production speed is 5-6m / min;

[0023] In the second needling process, the working width of the needling machine is controlled to be 3.6-3.8m, the needle density is 10,000-10,500 pieces / m, the needling frequency is 550-630 times / min, and the production speed is 6-7m / min.

[0024] In the third needling process, the working width of the needling machine is controlled to be 3.5-3.7m, the needle density is 10,000-10,500 pieces / m, the needling frequency is 580-650 times / min, and the production speed is 7-8m / min.

[0025] The post-processing method comprises the following steps: performing a hot pressing treatment on the grey cloth, controlling the hot pressing temperature to be 163-168° C., the roller gap to be 0.3-0.4 mm, and the roller pressure to be 800-900 psi. After the hot pressing treatment, the grey cloth is cut as needed to obtain a polypropylene-viscose-hemp fiber blended mattress spring wrap.

[0026] A polypropylene-viscose-hemp fiber blended mattress spring wrapping cloth is prepared by the above-mentioned preparation method; the polypropylene-viscose-hemp fiber blended mattress spring wrapping cloth has a gram weight of 80±5g / m 2 , thickness is 0.4±0.1mm, longitudinal breaking strength ≥280N, transverse breaking strength ≥300N; longitudinal tearing strength ≥90N, transverse tearing strength ≥80N; longitudinal elongation at break is 50-65%, transverse elongation at break is 60-75%; 45N longitudinal elongation is 5-10%, 45N transverse elongation is 8-15%; longitudinal bending length is 6-14cm, transverse bending length is 6-12cm.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The preparation method of the polypropylene-viscose-hemp fiber blended mattress spring covering cloth of the present invention comprises the following steps: selecting raw materials (polypropylene fiber, cotton-type viscose fiber, natural hemp fiber) of specific specifications, and performing opening and cleaning mixing (including opening, cotton grabbing, and fine opening processes) of the aforementioned raw materials in a specific ratio to obtain the mixed fibers after opening and cleaning; then performing carding with specific process parameters to obtain the carded mixed fibers; then performing web laying to obtain a mixed cotton web; then performing three needle punching reinforcement processes on the mixed cotton web to obtain a grey cloth; the grey cloth is post-processed to obtain the polypropylene-viscose-hemp fiber blended mattress spring covering cloth; The above-mentioned technical means cooperate and work synergistically with each other, which can not only realize the concept of green and sustainable development, but also improve the mechanical properties and corrosion resistance of mattress spring coverings while improving the anti-aging properties of non-woven fabrics; at the same time, in the preparation process of polypropylene-viscose-linen fiber blended mattress spring coverings, it can effectively avoid the problems of difficult to control the entanglement state, poor blending uniformity, difficult to control the soft and hard style, and unstable overall performance of the mattress spring coverings caused by inconsistent raw material fiber characteristics; it can effectively avoid fiber breakage during the carding process and fiber adhesion during the laying process, thereby improving the preparation yield of the mattress spring coverings.

[0029] (2) The polypropylene-viscose-hemp fiber blended mattress spring wrapping fabric of the present invention can realize the concept of green and sustainable development. While improving the anti-aging performance of the non-woven fabric, it also improves the mechanical properties and corrosion resistance of the mattress spring wrapping fabric. Moreover, the waste of the polypropylene-viscose-hemp fiber blended mattress spring wrapping fabric can be eliminated by burning. The burning process does not produce a melting point, which greatly reduces chemical pollutants.

[0030] (3) The polypropylene-viscose-hemp fiber blended mattress spring wrapping fabric of the present invention has good mechanical properties, with longitudinal breaking strength ≥282N, transverse breaking strength ≥305N; longitudinal tearing strength ≥92N, transverse tearing strength ≥83N; longitudinal elongation at break of 50-65%, transverse elongation at break of 57-75%; longitudinal elongation at 45N of 5-10%, transverse elongation at 45N of 8-15%; longitudinal bending length of 6-14cm, transverse bending length of 6-12cm.

[0031] (4) After being exposed to the sun for 1440 hours outdoors, the polypropylene-viscose-hemp fiber blended mattress spring wrapping fabric of the present invention can maintain 90-95% of its original longitudinal and transverse breaking strength, 90-95% of its original longitudinal and transverse breaking elongation, and 90-95% of its original longitudinal and transverse tearing strength, and has good aging resistance.

[0032] (5) After the polypropylene-viscose-hemp fiber blended mattress spring wrapping fabric of the present invention is immersed in a 5% by mass hydrochloric acid aqueous solution for 720 hours, the longitudinal and transverse breaking strength can be maintained at 90-95% of the original, the longitudinal and transverse breaking elongation can be maintained at 90-95% of the original, and the longitudinal and transverse tearing strength can be maintained at 90-95% of the original; after being immersed in a 5% by mass sodium hydroxide aqueous solution for 720 hours, the longitudinal and transverse breaking strength can be maintained at 90-95% of the original, the longitudinal and transverse breaking elongation can be maintained at 90-95% of the original, and the longitudinal and transverse tearing strength can be maintained at 90-95% of the original, and the corrosion resistance is good. DETAILED DESCRIPTION

[0033] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described. Example 1

[0034] This embodiment provides a method for preparing a polypropylene-viscose-hemp fiber blended mattress spring cover, specifically comprising:

[0035] 1. Raw material preparation

[0036] The following fiber specifications are selected as raw fiber:

[0037] Polypropylene fiber, fineness is 2.5D, length is 76mm, fiber breaking strength is 4.6CN / dtex, and fiber breaking elongation is 43%.

[0038] Cotton-type viscose fiber, with a fineness of 5.5D, a length of 51mm, a fiber breaking strength of 1.3CN / dtex, and a fiber breaking elongation of 32%.

[0039] Natural hemp fiber, with a fineness of 15D, a length of 30mm, a fiber breaking strength of 3.1CN / dtex, and a fiber breaking elongation of 2%.

[0040] 2. Opening, cleaning and mixing

[0041] According to the weight ratio of 65:23:12, polypropylene fiber, cotton viscose fiber and natural hemp fiber are opened by the blower and then enter the mixing box. After being evenly mixed in the mixing box, the cotton is picked and then finely opened and mixed to obtain the mixed fiber after opening and cleaning.

[0042] Among them, during the cotton picking process, the flat curtain running speed is controlled to be 1.5m / min, the inclined curtain running speed is 5m / min, and the cotton evenly running speed is 100m / min.

[0043] During the fine opening process, the cotton suction speed is controlled at 100m / min, the wind speed is 100m / min, and the cotton roller speed is 120m / min.

[0044] 3. Combing

[0045] The mixed fiber after cleaning is fed into the carding machine for carding, and the fiber feed rate of the carding machine is controlled to be 23g / m 2 , the line speed is 42.5m / min (the line speed opening of the carding machine is 30%), the chest cylinder speed is 380m / min, the main cylinder speed is 1100m / min, and the upper and lower doffer speeds are 110m / min to obtain the carded mixed fiber.

[0046] 4. Laying the net

[0047] The carded mixed fiber is passed into a web laying machine for web laying, and the number of web laying layers is controlled to be 3, the web laying width is 4.0m, the web laying output speed is 3m / min, the web laying tension is 0.7%, and the web laying overlap width is 100mm to obtain a uniform mixed cotton web.

[0048] The mixed cotton mesh has a width of 4.0 m, a smooth surface and good uniformity.

[0049] 5. Acupuncture reinforcement

[0050] The mixed cotton web is passed through a needle punching machine and subjected to three needle punching reinforcement processes to obtain a grey fabric with a mixed cotton web width of 3.7 m, a smooth surface and good uniformity.

[0051] In the first needling process, the working width of the needling machine is controlled to be 3.9m, the needle density is 1500 pieces / m, the needling frequency is 400 times / min, and the production speed is 5m / min.

[0052] In the second needling process, the working width of the needling machine is controlled to be 3.8m, the needle density is 10,000 pieces / m, the needling frequency is 550 times / min, and the production speed is 6m / min.

[0053] In the third needling process, the working width of the needling machine is controlled to be 3.7m, the needle density is 10,000 pieces / m, the needling frequency is 580 times / min, and the production speed is 7m / min.

[0054] 6. Post-processing

[0055] The grey cloth was subjected to hot pressing treatment, with the hot pressing temperature controlled at 163° C., the roller gap at 0.3 mm, and the roller pressure at 800 psi. After the hot pressing treatment, the cloth was cut as needed to obtain a polypropylene-viscose-hemp fiber blended mattress spring cover.

[0056] The polypropylene-viscose-hemp fiber blended mattress spring wrap has a gram weight of 82g / m 2 , thickness is 0.42mm, breaking strength: MD: 288N, CD: 310N; tear strength: MD: 97N, CD: 88N; elongation at break: MD: 55.32%, CD: 67.17%; elongation at 45N: MD: 7.23%, CD: 10.08%; bending length: MD: 10.08cm, CD: 8.23cm.

[0057] This embodiment also provides a polypropylene-viscose-linen fiber blended mattress spring cover, which is produced using the aforementioned preparation method.

[0058] According to the test, the performance retention rate of the polypropylene-viscose-hemp fiber blended mattress spring cover of this embodiment is 92% after being exposed to outdoor sunlight for 1440 hours: the gram weight is 82g / m 2 , thickness is 0.42mm, breaking strength: MD: 264.96N, CD: 285.2N; tear strength: MD: 89.24N, CD: 80.96N; elongation at break: MD: 50.89%, CD: 61.8%; elongation at 45N: MD: 6.65%, CD: 9.27%; bending length: MD: 9.27cm, CD: 7.57cm.

[0059] The polypropylene-viscose-hemp fiber blended mattress spring wrapping cloth has a performance retention rate of 91% after being soaked in a 5% hydrochloric acid aqueous solution for 720 hours: the gram weight is 82g / m2 , thickness is 0.42mm, breaking strength: MD: 262.08N, CD: 282.1N; tear strength: MD: 88.27N, CD: 80.08N; elongation at break: MD: 50.34%, CD: 61.12%; elongation at 45N: MD: 6.58%, CD: 9.17%; bending length: MD: 9.17cm, CD: 7.49cm. Example 2

[0060] A method for preparing a polypropylene-viscose-hemp fiber blended mattress spring cover, specifically comprising:

[0061] 1. Raw material preparation

[0062] The following fiber specifications are selected as raw fiber:

[0063] Polypropylene fiber, fineness is 3D, length is 73mm, fiber breaking strength is 4.7CN / dtex, and fiber breaking elongation is 44%.

[0064] Cotton-type viscose fiber, fineness is 5.7D, length is 58mm, fiber breaking strength is 1.5CN / dtex, and fiber breaking elongation is 33%.

[0065] Natural hemp fiber, with a fineness of 17D, a length of 35mm, a fiber breaking strength of 3.2CN / dtex, and a fiber breaking elongation of 2.5%.

[0066] 2. Opening, cleaning and mixing

[0067] According to the weight ratio of 68:21:11, polypropylene fiber, cotton viscose fiber and natural hemp fiber are opened by the blower and then enter the mixing box. After being evenly mixed in the mixing box, the cotton is picked and then finely opened and mixed to obtain the mixed fiber after opening and cleaning.

[0068] During the cotton picking process, the flat curtain running speed is controlled at 1.7m / min, the inclined curtain running speed is 5.4m / min, and the cotton evenly running speed is 105m / min.

[0069] During the fine opening process, the cotton suction speed is controlled at 102m / min, the wind speed is 102m / min, and the cotton roller speed is 125m / min.

[0070] 3. Combing

[0071] The mixed fiber after cleaning is fed into the carding machine for carding, and the fiber feed rate of the carding machine is controlled to be 24g / m 2, the line speed is 40m / min (the line speed opening of the carding machine is 28%), the chest cylinder speed is 370m / min, the main cylinder speed is 1150m / min, the upper and lower doffer speeds are 105m / min, and the carded mixed fiber is obtained.

[0072] 4. Laying the net

[0073] The carded mixed fiber is passed into a web laying machine for web laying, and the number of web laying layers is controlled to be 3 layers, the web laying width is 3.9m, the web laying output speed is 3.2m / min, the web laying tension is 0.8%, and the web laying overlap width is 110mm to obtain a uniform mixed cotton web.

[0074] The mixed cotton mesh has a width of 3.9m, a smooth surface and good uniformity.

[0075] 5. Acupuncture reinforcement

[0076] The mixed cotton web is passed through a needle punching machine and subjected to three needle punching reinforcement processes to obtain a grey fabric with a mixed cotton web width of 3.6 m, a smooth surface and good uniformity.

[0077] In the first needling process, the working width of the needling machine is controlled to be 3.8m, the needle density is 1550 pieces / m, the needling frequency is 450 times / min, and the production speed is 5.5m / min.

[0078] In the second needling process, the working width of the needling machine is controlled to be 3.7m, the needle density is 10250 pieces / m, the needling frequency is 590 times / min, and the production speed is 6.5m / min.

[0079] In the third needling process, the working width of the needling machine is controlled to be 3.6m, the needle density is 10,250 pieces / m, the needling frequency is 620 times / min, and the production speed is 7.5m / min.

[0080] 6. Post-processing

[0081] The grey cloth was subjected to hot pressing treatment, with the temperature of the hot pressing treatment controlled at 165° C., the gap between the pressing rollers at 0.35 mm, and the pressure of the pressing rollers at 850 psi. After the hot pressing treatment, the cloth was cut as needed to obtain a polypropylene-viscose-hemp fiber blended mattress spring cover.

[0082] The polypropylene-viscose-hemp fiber blended mattress spring wrap has a gram weight of 78g / m 2, thickness is 0.40mm, breaking strength: MD: 282N, CD: 305N; tear strength: MD: 92.4N, CD: 83.2N; elongation at break: MD: 58.22%, CD: 69.37%; elongation at 45N: MD: 8.53%, CD: 12.76%; bending length: MD: 9.17cm, CD: 7.29cm.

[0083] This embodiment also provides a polypropylene-viscose-linen fiber blended mattress spring cover, which is produced using the aforementioned preparation method.

[0084] According to the test, the performance retention rate of the polypropylene-viscose-hemp fiber blended mattress spring cover of this embodiment after being exposed to outdoor sunlight for 1440 hours is 93.5%; the gram weight is 78g / m 2 , thickness is 0.40mm, breaking strength: MD: 263.67N, CD: 285.18N; tear strength: MD: 86.39N, CD: 77.79N; elongation at break: MD: 54.44%, CD: 64.86%; elongation at 45N: MD: 7.98%, CD: 11.93%; bending length: MD: 8.48cm, CD: 6.82cm.

[0085] The polypropylene-viscose-hemp fiber blended mattress spring wrapping cloth has a performance retention rate of 92.5% after being soaked in a 5% sodium hydroxide aqueous solution for 720 hours. The gram weight is 78g / m 2 , thickness is 0.40mm, breaking strength: MD: 260.85N, CD: 282.13N; tear strength: MD: 85.47N, CD: 76.96N; elongation at break: MD: 53.85%, CD: 64.17%; elongation at 45N: MD: 7.89%, CD: 11.80%; bending length: MD: 8.48cm, CD: 6.74cm. Example 3

[0086] A method for preparing a polypropylene-viscose-hemp fiber blended mattress spring cover, specifically comprising:

[0087] 1. Raw material preparation

[0088] The following fiber specifications are selected as raw fiber:

[0089] Polypropylene fiber, fineness is 3.5D, length is 76mm, fiber breaking strength is 4.9CN / dtex, and fiber breaking elongation is 43%.

[0090] Cotton-type viscose fiber, fineness is 6D, length is 64mm, fiber breaking strength is 1.8CN / dtex, and fiber breaking elongation is 34%.

[0091] Natural hemp fiber, with a fineness of 20D, a length of 40mm, a fiber breaking strength of 3.4CN / dtex, and a fiber breaking elongation of 3%.

[0092] 2. Opening, cleaning and mixing

[0093] According to the weight ratio of 70:20:10, polypropylene fiber, cotton viscose fiber and natural hemp fiber are opened by the blower and then enter the mixing box. After uniform mixing in the mixing box, the cotton is picked and then finely opened and mixed to obtain the mixed fiber after opening and cleaning.

[0094] During the cotton picking process, the flat curtain running speed is controlled at 1.8m / min, the inclined curtain running speed is 5.7m / min, and the cotton evenly distributed running speed is 108m / min.

[0095] During the fine opening process, the cotton suction speed is controlled at 103m / min, the wind speed is 103m / min, and the cotton roller speed is 127m / min.

[0096] 3. Combing

[0097] The mixed fiber after cleaning is fed into the carding machine for carding, and the fiber feed rate of the carding machine is controlled to be 25g / m 2 , the line speed is 45m / min (the line speed opening of the carding machine is 32%), the chest cylinder speed is 380m / min, the main cylinder speed is 1200m / min, the upper and lower doffer speeds are 115m / min, and the carded mixed fiber is obtained.

[0098] 4. Laying the net

[0099] The carded mixed fiber is passed into a web laying machine for web laying, and the number of web laying layers is controlled to be 4, the web laying width is 3.8m, the web laying output speed is 3.5m / min, the web laying tension is 0.9%, and the web laying overlap width is 120mm to obtain a uniform mixed cotton web.

[0100] The mixed cotton mesh has a width of 3.8m, a smooth surface and good uniformity.

[0101] 5. Acupuncture reinforcement

[0102] The mixed cotton web is passed through a needle punching machine and subjected to three needle punching reinforcement processes to obtain a grey fabric with a mixed cotton web width of 3.5 m, a smooth surface and good uniformity.

[0103] In the first needling process, the working width of the needling machine is controlled to be 3.7m, the needle density is 1600 pieces / m, the needling frequency is 500 times / min, and the production speed is 6m / min.

[0104] In the second needling process, the working width of the needling machine is controlled to be 3.6m, the needle density is 10,500 pieces / m, the needling frequency is 630 times / min, and the production speed is 7m / min.

[0105] In the third needling process, the working width of the needling machine is controlled to be 3.5m, the needle density is 10,500 pieces / m, the needling frequency is 650 times / min, and the production speed is 8m / min.

[0106] 6. Post-processing

[0107] The grey cloth was subjected to hot pressing treatment, with the hot pressing temperature controlled at 168° C., the roller gap at 0.4 mm, and the roller pressure at 900 psi. After the hot pressing treatment, the cloth was cut as needed to obtain a polypropylene-viscose-hemp fiber blended mattress spring cover.

[0108] The polypropylene-viscose-hemp fiber blended mattress spring wrap has a gram weight of 84.7 g / m 2 , thickness is 0.47mm, breaking strength: MD: 316.2N, CD: 347.6N; tear strength: MD: 109.4N, CD: 103.2N; elongation at break: MD: 55.12%, CD: 60.39%; elongation at 45N: MD: 5.35%, CD: 8.67%; bending length: MD: 12.17cm, CD: 11.43cm.

[0109] This embodiment also provides a polypropylene-viscose-linen fiber blended mattress spring cover, which is produced using the aforementioned preparation method.

[0110] According to the test, the polypropylene-viscose-hemp fiber blended mattress spring cover of this embodiment has a performance retention rate of 94.5% after being exposed to outdoor sunlight for 1440 hours: the gram weight is 84.7g / m 2 , thickness is 0.47mm, breaking strength: MD: 298.81N, CD: 328.48N; tear strength: MD: 103.38N, CD: 97.52N; elongation at break: MD: 52.09%, CD: 57.07%; elongation at 45N: MD: 5.06%, CD: 8.19%; bending length: MD: 11.50cm, CD: 10.80cm.

[0111] The polypropylene-viscose-hemp fiber blended mattress spring wrapping cloth has a performance retention rate of 93.5% after being soaked in a 5% hydrochloric acid aqueous solution for 720 hours. The gram weight is 84.7g / m 2, thickness is 0.47mm, breaking strength: MD: 295.65N, CD: 325.01N; tear strength: MD: 102.29N, CD: 96.49N; elongation at break: MD: 51.54%, CD: 56.46%; elongation at 45N: MD: 5.00%, CD: 8.11%; bending length: MD: 11.38cm, CD: 10.69cm.

[0112] Comparative Example 1

[0113] Comparative Example 1 adopts the scheme of Example 1, except that: 1) the weight ratio of polypropylene fiber, cotton viscose fiber and hemp fiber is adjusted to 80:15:5; 2) in the carding step, the fiber feed rate of the carding machine is controlled to 20g / m 2 , the line speed is 49m / min (the line speed opening of the carding machine is 35%), the chest cylinder speed is 350m / min, the main cylinder speed is 1000m / min, and the upper and lower doffer speeds are 100m / min.

[0114] The polypropylene-viscose-hemp fiber blended mattress spring wrapping prepared in Comparative Example 1 has a gram weight of 81.7 g / m 2 , thickness is 0.43mm, breaking strength: MD: 230.2N, CD: 242.6N; tear strength: MD: 75.3N, CD: 63.2N; elongation at break: MD: 45.12%, CD: 50.39%; elongation at 45N: MD: 4.35%, CD: 6.67%; bending length: MD: 14.27cm, CD: 12.13cm.

[0115] According to the test, the performance retention rate of the polypropylene-viscose-hemp fiber blended mattress spring cover of comparative example 1 after being exposed to outdoor sunlight for 1440 hours is 61.5%; the gram weight is 81.7g / m 2 , thickness is 0.43mm, breaking strength: MD:141.57N, CD:149.20N; tear strength: MD:46.31N, CD:38.87N; elongation at break: MD:27.75%, CD:30.99%; elongation at 45N: MD:2.68%, CD:4.10%; bending length: MD:8.78cm, CD:7.46cm.

[0116] The polypropylene-viscose-hemp fiber blended mattress spring wrapping cloth has a performance retention rate of 63.7% after being soaked in a 5% hydrochloric acid aqueous solution for 720 hours. The gram weight is 81.7g / m 2, thickness is 0.43mm, breaking strength: MD:146.64N, CD:154.54N; tear strength: MD:47.97N, CD:40.26N; elongation at break: MD:28.74%, CD:32.10%; elongation at 45N: MD:2.77%, CD:4.25%; bending length: MD:9.09cm, CD:7.73cm.

[0117] As can be seen, the method for preparing the polypropylene-viscose-linen fiber blended mattress spring covering of the present invention comprises selecting raw materials (polypropylene fiber, cotton-type viscose fiber, natural linen fiber) of specific specifications, performing blowroom mixing (including opening, plucking, and fine opening steps) on the raw materials in a specific ratio to obtain a blowroom-cleaned mixed fiber; then performing carding with specific process parameters to obtain a carded mixed fiber; then performing web laying to obtain a mixed cotton web; then performing three needling reinforcement steps on the mixed cotton web to obtain a grey fabric; and finally, performing post-processing on the grey fabric to obtain the polypropylene-viscose-linen fiber blended mattress spring covering. The aforementioned technical means cooperate and work synergistically with each other, which can not only realize the concept of green and sustainable development, but also improve the anti-aging performance of non-woven fabrics while improving the mechanical properties and corrosion resistance of mattress spring wraps; at the same time, in the preparation process of polypropylene-viscose-linen fiber blended mattress spring wraps, it can effectively avoid the problems of difficult to control entanglement state, poor blending uniformity, difficult to control soft and hard style, and unstable overall performance of mattress spring wraps caused by inconsistent raw material fiber characteristics; effectively avoid fiber breakage during the combing process, and avoid fiber adhesion during the laying process, thereby improving the preparation yield of mattress spring wraps.

[0118] Specifically, in the preparation method of the polypropylene-viscose-linen fiber blended mattress spring covering cloth of the present invention, three raw materials of specific specifications (polypropylene fiber, cotton-type viscose fiber, and natural linen fiber) are combined in a specific ratio, and a specific opening and cleaning blending (including opening, cotton gathering, and fine opening processes) is adopted to improve the blending uniformity of the raw material fibers. Combing with specific process parameters effectively avoids breakage of the raw material fibers during the combing process, thereby reducing the difficulty of combing. Laying with specific process parameters effectively avoids fiber adhesion during the laying process. Needle punching reinforcement with specific process parameters effectively avoids the problem of difficult-to-control entanglement due to inconsistent raw material fiber properties. Finally, post-processing is used to reduce the softness and hardness of the mattress spring covering cloth.

[0119] According to the preparation test in the embodiment, the polypropylene-viscose-linen fiber blended mattress spring cover prepared has a longitudinal breaking strength of 282-298.81N and a transverse breaking strength of 305-328.48N; a longitudinal tearing strength of 92.4-103.38N and a transverse tearing strength of 83.2-97.52N; a longitudinal elongation at break of 52.09-58.22%, and a transverse elongation at break of 57.07-69.37%; a longitudinal elongation of 45N of 5.06-8.53%, and a transverse elongation of 45N of 8.19-12.76%; a longitudinal bending length of 9.17-11.50cm, and a transverse bending length of 7.29-10.80cm.

[0120] Comparative Example 1 shows that after changing the raw material composition of the polypropylene-viscose-linen fiber blended mattress spring covering and changing the carding-related process parameters, the mechanical properties of the polypropylene-viscose-linen fiber blended mattress spring covering are significantly reduced; at the same time, after being exposed to outdoor sunlight for 1440 hours or acid treated for 720 hours, the performance retention rate is greatly reduced.

[0121] Unless otherwise specified, all percentages used in the present invention are by mass.

[0122] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing a polypropylene-viscose-hemp fiber blended mattress spring cover, characterized in that: The following steps are included: cleaning and mixing, carding, laying, needle punching and reinforcement, and post-processing; The method for opening and mixing is as follows: polypropylene fiber, cotton viscose fiber and natural hemp fiber are opened by an opening and mixing machine and then enter a mixing box, after which the fibers are evenly mixed in the mixing box and then picked, and then finely opened and mixed to obtain mixed fibers after opening and mixing; The polypropylene fiber has a fineness of 2.5-3.5D, a length of 70-76 mm, a fiber breaking strength of 4.5-5 CN / dtex, and a fiber breaking elongation of 40-50%; The cotton-type viscose fiber has a fineness of 5.5-6D, a length of 51-64 mm, a fiber breaking strength of 1-2 CN / dtex, and a fiber breaking elongation of 30-35%; The natural hemp fiber has a fineness of 15-20D, a length of 30-40 mm, a fiber breaking strength of 3-3.5 CN / dtex, and a fiber breaking elongation of 0.1-5%; In the blow-drying mixture, the weight ratio of polypropylene fiber, cotton viscose fiber, and natural hemp fiber is 65-70:20-23:10-12; The combing method comprises the following steps: feeding the blown mixed fibers into a combing machine for combing to obtain the combed mixed fibers; During the carding process, the fiber feed rate of the carding machine is controlled to be 23-25 ​​g / m 2 , line speed is 40-45m / min, chest cylinder speed is 370-390m / min, main cylinder speed is 1100-1200m / min, upper and lower doffer speed is 105-115m / min; The web laying method comprises the following steps: feeding the combed mixed fibers into a web laying machine for web laying, controlling the number of web laying layers to be 3-4 layers, and obtaining a mixed cotton web; The needle punching reinforcement method is to pass the mixed cotton web into a needle punching machine and perform three needle punching reinforcement processes to obtain a grey cloth with a mixed cotton web width of 3.5-3.7m; In the three needling reinforcement processes of the needling reinforcement, in the first needling process, the working width of the needling machine is controlled to be 3.7-3.9m, the needle density is 1500-1600 pieces / m, the needling frequency is 400-500 times / min, and the production speed is 5-6m / min; in the second needling process, the working width of the needling machine is controlled to be 3.6-3.8m, the needle density is 10000-10500 pieces / m, the needling frequency is 550-630 times / min, and the production speed is 6-7m / min; in the third needling process, the working width of the needling machine is controlled to be 3.5-3.7m, the needle density is 10000-10500 pieces / m, the needling frequency is 580-650 times / min, and the production speed is 7-8m / min; The post-processing method comprises the following steps: performing a hot pressing treatment on the grey cloth, controlling the hot pressing temperature to be 163-168° C., the roller gap to be 0.3-0.4 mm, and the roller pressure to be 800-900 psi. After the hot pressing treatment, a polypropylene-viscose-hemp fiber blended mattress spring wrap is obtained.

2. The method for preparing the polypropylene-viscose-flax fiber blended mattress spring cover according to claim 1, characterized in that: In the cleaning and mixing process, the flat curtain running speed is controlled to be 1.5-2m / min, the inclined curtain running speed is controlled to be 5-6m / min, and the cotton roller speed is controlled to be 100-110m / min.

3. The method for preparing the polypropylene-viscose-hemp fiber blended mattress spring cover according to claim 1, characterized in that: In the opening, cleaning and mixing, the cotton suction speed is controlled to be 100-105 m / min during the fine opening process, and the cotton roller speed is controlled to be 120-130 m / min.

4. The method for preparing the polypropylene-viscose-hemp fiber blended mattress spring cover according to claim 1, characterized in that: In the web laying, the web laying width is 3.8-4m, the web laying output speed is 3-3.5m / min, and the web laying overlap width is 100-120mm.

5. A polypropylene-viscose-hemp fiber blended mattress spring cover, characterized in that: The polypropylene-viscose-hemp fiber blended mattress spring wrapping fabric is prepared by the preparation method according to any one of claims 1 to 4; the gram weight of the polypropylene-viscose-hemp fiber blended mattress spring wrapping fabric is 80±5g / m 2 , thickness is 0.4±0.1mm, longitudinal breaking strength ≥280N, transverse breaking strength ≥300N; longitudinal tearing strength ≥90N, transverse tearing strength ≥80N; longitudinal elongation at break is 50-65%, transverse elongation at break is 60-75%; 45N longitudinal elongation is 5-10%, 45N transverse elongation is 8-15%; longitudinal bending length is 6-14cm, transverse bending length is 6-12cm.