阅读说明：本技术 一种无纺精干麻针刺毡制造方法 (Method for manufacturing non-woven refined dry hemp needled felt ) 是由 高志广 孔顺 于 2019-08-29 设计创作，主要内容包括：本发明公开了一种无纺精干麻针刺毡制造方法,有效改善现有精干麻毛毡在针刺作业中易断裂的情况,采用多重脱胶质处理以及软化处理,实现了现有市场中精干麻针刺毡性能的突破。(The invention discloses a method for manufacturing a non-woven refined dry ramie needled felt, which effectively improves the condition that the prior refined dry ramie felt is easy to break in needling operation, adopts multiple degumming treatment and softening treatment, and realizes the breakthrough of the performance of the refined dry ramie needled felt in the prior market.)

1. A method for manufacturing a non-woven refined dry hemp needled felt is characterized by comprising the following steps: degelatinizing the degelatinized ramie, mixing the degelatinized ramie and the fiber of the ramie according to the mass ratio of 1: 1, adding the degelatinized ramie and the fiber of the degelatinized ramie into an opener, opening the degelatinized ramie for 30min, pouring the degelatinized ramie and the fiber of the degelatinized ramie into a cotton mixing box, pouring the cotton mixing box with air pressure to a carding machine, winding the fiber of the raw cotton into a net-shaped felt board by the carding machine in the forward direction, taking a supporting plate after the net is formed, placing the net-shaped felt board on the supporting plate, spraying a specially-made fiber softening reagent on the surface of the net-shaped felt board, soaking the net-shaped felt board for 1h by using the fiber softening reagent, drying the net-shaped felt board in a drying box, stopping the drying when the fluffiness of the net-shaped felt board reaches 450, carrying out needling operation by using needling equipment, sequentially carrying out pre-needling, barb and normal needling, gradually increasing the needling density, gradually increasing the needling frequency, and performing surface calendering operation, and finally performing felt integral experience needle detection.

2. The method of manufacturing a nonwoven worsted needled felt according to claim 1, wherein: when degumming treatment is carried out, refined dry ramie is cut into short fibers of 40-60 mm, the short fibers are poured into a biological degumming tank, biological degumming liquid is poured into the biological degumming tank for soaking, the biological degumming liquid contains crude enzyme liquid with the concentration of 3.5%, chemical degumming is carried out after 20min, the refined dry ramie is taken out from the degumming tank and is moved into a chemical degumming tank, chemical degumming liquid is poured into the chemical degumming tank, the chemical degumming liquid contains caustic soda with the concentration of 2%, after chemical degumming treatment, the refined dry ramie is taken out and is washed with water, pickling is carried out after washing with water, the pickling is carried out by using 1% sulfuric acid with the concentration of 1%, the bath ratio is 1: 15, the pickling temperature is 15 ℃, secondary washing is carried out after pickling, cooking is carried out after secondary washing with water, the cooking is carried out by using a mixture of 4% water-soluble silicate with the concentration of 2% and 2% sodium tripolyphosphate, the bath ratio is 1: 12, the cooking temperature is 100 ℃, after the cooking is completed, three water washes were performed.

3. The method of manufacturing a nonwoven worsted needled felt according to claim 1, wherein: the kenaf fiber is cut into short fibers with the diameter of about 100 mm.

4. The method of manufacturing a nonwoven worsted needled felt according to claim 1, wherein: the speed of the bottom curtain of the carding machine is controlled to be 1.5 m/min.

5. The method of manufacturing a nonwoven worsted needled felt according to claim 1, wherein: the fiber softening reagent comprises 7 parts of zinc oxide, 2 parts of stearic acid and 4 parts of pine coke, and water is added to the mixture to form a solution with the concentration of 5%.

6. The method of manufacturing a nonwoven worsted needled felt according to claim 1, wherein: the needle density during pre-needling is 250 needles/m 2, the needling frequency is 300 times/min, the needle density during barb is 350 needles/m 2, the needling frequency is 440 times/min, the needle density during forward needling is 400 needles/m 2, and the needling frequency is 500 times/min.

7. The method of manufacturing a nonwoven worsted needled felt according to claim 1, wherein: the winding roller is a hot roller, the interior of the winding roller is heated by water circulation, and the surface temperature is more than 85 ℃.

Technical Field

The invention relates to the field of felt processing, in particular to a method for manufacturing a non-woven degummed ramie needled felt.

Background

The invention discloses a method for manufacturing a non-woven dry ramie needled felt, which is widely applied to felts in automobile interiors, wherein when the felts produced by the existing felt processing manufacturers are processed, the phenomenon that ramie fibers are punctured and broken is very easy to occur in the needling step, particularly, the felt products made of dry ramie have high tensile strength, so the felts are easy to puncture and break, rough surfaces and poor texture, but the dry ramie has the layering performance which cannot be achieved by other natural ramie fibers, the felts which can be processed and formed are various in thickness, lighter in weight compared with other natural ramie, large in raw material planting amount and low in cost, and the maximum advantages of the felts cannot be brought into play while the defects of the dry ramie are made up in the existing felt production.

Disclosure of Invention

In view of the above technical problems, the present invention provides a method for manufacturing a nonwoven dry ramie needled felt, comprising:

Degelatinizing the degelatinized ramie, mixing the degelatinized ramie and the fiber of the ramie according to the mass ratio of 1: 1, adding the degelatinized ramie and the fiber of the degelatinized ramie into an opener, opening the degelatinized ramie for 30min, pouring the degelatinized ramie and the fiber of the degelatinized ramie into a cotton mixing box, pouring the cotton mixing box with air pressure to a carding machine, winding the fiber of the raw cotton into a net-shaped felt board by the carding machine in the forward direction, taking a supporting plate after the net is formed, placing the net-shaped felt board on the supporting plate, spraying a specially-made fiber softening reagent on the surface of the net-shaped felt board, soaking the net-shaped felt board for 1h by using the fiber softening reagent, drying the net-shaped felt board in a drying box, stopping the drying when the fluffiness of the net-shaped felt board reaches 450, carrying out needling operation by using needling equipment, sequentially carrying out pre-needling, barb and normal needling, gradually increasing the needling density, gradually increasing the needling frequency, and performing surface calendering operation, and finally performing felt integral experience needle detection.

Preferably, during degumming treatment, the degummed ramie is cut into short fibers of 40-60 mm, the short fibers are poured into a biological degumming tank, biological degumming liquid is poured into the biological degumming tank for soaking, the biological degumming liquid contains crude enzyme liquid with the concentration of 3.5%, chemical degumming is carried out after soaking for 20min, the degummed ramie is taken out from the degumming tank and is moved into a chemical degumming tank, chemical degumming liquid is poured into the chemical degumming tank, the chemical degumming liquid contains caustic soda with the concentration of 2%, after chemical degumming treatment, the degummed ramie is taken out and is washed with water, pickling is carried out after washing with water, the pickling is carried out with the solution with the concentration of 1% sulfuric acid, the bath ratio is 1: 15, the pickling temperature is 15 ℃, after pickling is carried out with secondary water, cooking is carried out after secondary washing with water, the solution for cooking is a mixture of water-soluble silicate with the concentration of 4% and sodium tripolyphosphate with the concentration of 2%, the cooking temperature is 1: 12, the cooking temperature is 100 ℃, after the cooking, washing with water is carried out for three times.

Preferably, the kenaf fibers are cut into short fibers of about 100 mm.

Preferably, the carding machine controls the bottom curtain speed to be 1.5 m/min.

preferably, the fiber softening agent comprises 7 parts of zinc oxide, 2 parts of stearic acid and 4 parts of pine coke, and water is added to the mixture to form a solution with a concentration of 5%.

Preferably, the density of needles during pre-needling is 250 needles/m 2, the needling frequency is 300 times/min, the density of needles during barb is 350 needles/m 2, the needling frequency is 440 times/min, the density of needles during forward needling is 400 needles/m 2, and the needling frequency is 500 times/min.

Preferably, the winding roller is a hot roller, the inside of the winding roller is heated by water circulation, and the surface temperature of the winding roller is more than 85 ℃.

Has the advantages that:

1. By adopting various degumming treatment methods, degumming is more sufficient, the tensile strength is reduced, and the occurrence of needle puncture breakage is reduced.

2. And a step of softening treatment is added, and a specially-made fiber softening agent is used, so that the deformation performance of the fiber softening agent is improved, the inevitable surface aging caused by the removal of the colloid is delayed, and the service life of a final finished product is prolonged.

3. The stretching length is reduced by adopting a multi-direction low-depth needling mode, so that the occurrence of fracture is reduced, and the surface roughness of a finished product is greatly reduced. Greatly reducing the defective rate of products.

Detailed Description

The manufacturing method comprises the following steps: degelatinizing the degelatinized ramie, mixing the degelatinized ramie and the fiber of the ramie according to the mass ratio of 1: 1, adding the degelatinized ramie and the fiber of the degelatinized ramie into an opener, opening the degelatinized ramie for 30min, pouring the degelatinized ramie and the fiber of the degelatinized ramie into a cotton mixing box, pouring the cotton mixing box with air pressure to a carding machine, winding the fiber of the raw cotton into a net-shaped felt board by the carding machine in the forward direction, taking a supporting plate after the net is formed, placing the net-shaped felt board on the supporting plate, spraying a specially-made fiber softening reagent on the surface of the net-shaped felt board, soaking the net-shaped felt board for 1h by using the fiber softening reagent, drying the net-shaped felt board in a drying box, stopping the drying when the fluffiness of the net-shaped felt board reaches 450, carrying out needling operation by using needling equipment, sequentially carrying out pre-needling, barb and normal needling, gradually increasing the needling density, gradually increasing the needling frequency, and performing surface calendering operation, and finally performing felt integral experience needle detection.

When degumming treatment is carried out, refined dry ramie is cut into short fibers of 40-60 mm, the short fibers are poured into a biological degumming tank, biological degumming liquid is poured into the biological degumming tank for soaking, the biological degumming liquid contains crude enzyme liquid with the concentration of 3.5%, chemical degumming is carried out after 20min, the refined dry ramie is taken out from the degumming tank and is moved into a chemical degumming tank, chemical degumming liquid is poured into the chemical degumming tank, the chemical degumming liquid contains caustic soda with the concentration of 2%, after chemical degumming treatment, the refined dry ramie is taken out and is washed with water, pickling is carried out after washing with water, the pickling is carried out by using 1% sulfuric acid with the concentration of 1%, the bath ratio is 1: 15, the pickling temperature is 15 ℃, secondary washing is carried out after pickling, cooking is carried out after secondary washing with water, the cooking is carried out by using a mixture of 4% water-soluble silicate with the concentration of 2% and 2% sodium tripolyphosphate, the bath ratio is 1: 12, the cooking temperature is 100 ℃, after the cooking is completed, three water washes were performed.

Before the kenaf fiber is added for opening, the kenaf fiber is cut into short fibers with the length of about 100mm, so that cotton mixing and opening are facilitated. When the carding machine is used for manufacturing the raw cotton into the net-shaped felt plate, the speed of the bottom curtain is controlled to be 1.5m/min, and the condition that fibers are wound on a cylinder of equipment can be avoided while the lapping speed is taken into consideration.

The fiber softening agent in the invention comprises 7 parts of zinc oxide, 2 parts of stearic acid and 4 parts of pine coke, and water is added to the mixture to form a solution with the concentration of 5%. The needle density during pre-needling is 250 needles/m 2, the needling frequency is 300 times/min, the needle density during barb is 350 needles/m 2, the needling frequency is 440 times/min, the needle density during forward needling is 400 needles/m 2, and the needling frequency is 500 times/min. When calendaring, a hot roller with the temperature of more than 85 ℃ is used, the inside of the hot roller is heated by water circulation, and the surface temperature is more balanced.

In order to verify the effect of the final product, the invention is provided with a fracture toughness experiment, and the effect of the product obtained by the traditional degummed ramie processing method is compared with that of the product obtained by the invention. The degummed ramie felt produced by the traditional processing mode is set as an experimental group 1, the degummed ramie felt obtained by the invention is set as an experimental group 2, and the degummed ramie felt prepared without any degumming treatment is set as a control group, so as to obtain the data shown in the following table 1.

TABLE 1

As shown in the data in table 1, the felt product obtained in the present invention has a relatively light weight, and the needle breakage is improved significantly, and in order to reduce the error, 20 groups of the same control group, experiment group 2, and experiment group 1 are provided in the present experiment, and the data are averaged.

Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.