阅读说明：本技术 一种复合无纺布的制备方法及其应用 (Preparation method and application of composite non-woven fabric ) 是由 刘少峰 黄玉琴 邱永龙 李伏君 颜肖辉 徐多乐 刘凯华 裴新梅 于 2020-12-04 设计创作，主要内容包括：本发明公开了一种复合无纺布的制备方法及其应用,所述复合无纺布,由蚕丝纤维网层和棉纤维网层铺叠经过水刺工艺制备得到,蚕丝层为直铺铺网,纯棉层为全交叉铺网。本发明制备得到的复合无纺布避免了单独使用蚕丝纤维结合紧密,吸水性差,应用于卫生巾面层,经血下渗速度慢,易造成侧漏等问题；同时避免了单独使用普通棉纤维,经脱脂漂白后,制成水刺布质感不够柔软舒适的问题。利用其制备成卫生巾后,蚕丝层接触皮肤,纵向排列的纤维易于经血的纵向扩散,不易侧漏；纯棉层接触卫生巾的导流层,易于经血的下渗,并向四周扩散,增强了卫生巾的安全性和吸收性,解决经血侧漏的问题。同时,采用复合无纺布制成的卫生巾吸收速度和反渗量等指标明显优于其他材质制备的卫生巾。(The invention discloses a preparation method and application of a composite non-woven fabric. The composite non-woven fabric prepared by the invention avoids the problems that the combination of silk fibers is tight, the water absorption is poor, the composite non-woven fabric is applied to a surface layer of a sanitary towel, the infiltration speed of menstrual blood is low, side leakage is easy to cause and the like; meanwhile, the problem that the spunlace fabric made of the single common cotton fiber after degreasing and bleaching is not soft and comfortable enough is solved. After the sanitary towel is prepared by the silk layer, the silk layer contacts with the skin, and the longitudinally arranged fibers are easy to longitudinally diffuse menses and are not easy to leak laterally; the pure cotton layer contacts with the flow guide layer of the sanitary towel, so that the menstrual blood is easy to seep downwards and spread to the periphery, the safety and the absorbability of the sanitary towel are enhanced, and the problem of side leakage of the menstrual blood is solved. Meanwhile, indexes such as the absorption speed, the reverse osmosis amount and the like of the sanitary towel made of the composite non-woven fabric are obviously superior to those of the sanitary towel made of other materials.)

1. The composite non-woven fabric is characterized in that the composite non-woven fabric is prepared by laying a silk fiber net layer and a cotton fiber net layer and performing a spunlace process, wherein the silk layer is a straight laying net, and the pure cotton layer is a full-crossed laying net.

2. The preparation method of the composite non-woven fabric is characterized by comprising the following steps:

s1, silk fiber pretreatment: uniformly spraying a spraying oil agent containing an antistatic agent on the silk fiber;

s2, preparing a silk fiber net: sequentially carrying out preliminary opening, fine opening, fiber decomposition and combing on the pretreated silk fibers, carrying out single fiber formation, sending the silk fibers into a cotton storage box and a carding machine to uniformly and directly lay the silk into a net, wherein the pressure in the cotton storage box is 800-850 Pa, the feeding speed of a cotton feeding roller of the carding machine is 0.4-0.50 m/min, the speed of a cylinder is 700-1200 m/min, and the speed of an output fiber net is 30-40 m/min;

s3, preparing a cotton fiber net:

1) removing big impurities and heavy impurities in cotton fibers in sequence, preliminarily opening, removing foreign fibers, finely opening and reducing fine impurities, finely carding, sending into a cotton storage box and uniformly forming a net by a carding machine, wherein the pressure of the cotton storage box is 850-900 Pa, the feeding speed of a cotton roller by the carding machine is 1.10-1.30 m/min, the cylinder speed is 900-1200 m/min, and the output fiber net speed is 40-45 m/min;

2) the two layers of cotton fiber webs are overlapped into 4 layers through full-crossing lapping, then drafting is carried out, the drafting multiple is divided into 7 levels, the drafting multiple of each level is 1.02-1.10, and the drafting ratio is 1.4-2.2;

s4, hydroentangling and reinforcing the composite fiber web: the prepared 4 layers of cross cotton fiber nets and 2 layers of straight silk fiber nets are laid together to prepare a composite fiber net, silk nets are arranged on the cotton fiber nets, and the composite fiber net is reinforced into composite spunlace non-woven fabrics through prewetting, spunlace and vacuum suction;

s5, degreasing and bleaching: putting the mixture into a pressure container with the temperature of 100-105 ℃ and the pressure of 5MPa, adding a refining agent F402-3 g/L, sodium silicate 0.4-0.7 g/L, 32% (w/v) sodium hydroxide 6-8 g/L and 27.5% (v/v) hydrogen peroxide 12-16 g/L in a distributed manner, degreasing and bleaching for 1-3 h, and adding 0.6-0.8 g/L citric acid for neutralization;

drying: the spunlaced silk and cotton composite non-woven fabric quickly discharges water remained in the non-woven fabric material through negative pressure vacuum suction, roller pre-drying and a rotary screen hot air penetrating type dryer.

3. The production method according to claim 2, characterized in that the ratio of the oil agent: silk fiber is 1: 20-100 mass ratio of oil solution.

4. The method according to claim 2, wherein the antistatic agent is S10.

5. The method according to claim 2, wherein the preparation of the cotton fiber web is performed in an environment with a moisture regain of 6 to 8%.

6. The preparation method of claim 2, wherein the pre-wetting adopts a steel wire mesh drum clamping mode, a single-drainage pricking plate with the thickness of 0.12mm is used, and the pressure of a pre-wetting water pricking head is controlled within 4 bar.

7. The preparation method of claim 2, wherein the spunlace process adopts a two-drum and rear-platform manner, 4 groups of spunlace heads are used together, the aperture of each spunlace head is 0.12mm, 2 spunlace heads are arranged on each drum, the pressure of the spunlace heads of the 2 groups of the front drums is 15-25 bar and 20-25 bar respectively, and the pressure of the spunlace heads of the 2 groups of the rear drums is 30-35 bar and 15-20 bar respectively.

8. The process according to claim 7, characterized in that the pressure of the water-jet heads of the preceding drum 2 group is 17bar and 20bar respectively, and the pressure of the water-jet heads of the following drum 2 group is 33bar and 18bar respectively.

9. A composite nonwoven fabric produced by the production method according to any one of claims 2 to 8.

10. Use of the composite nonwoven fabric according to claim 1 or 9 for the preparation of disposable hygiene articles.

Technical Field

The invention relates to the technical field of non-woven fabrics, in particular to a preparation method and application of a composite non-woven fabric.

Background

The non-woven fabric is widely applied to medical products and sanitary products. The non-woven fabrics used in the sanitary products are hot air non-woven fabrics, spun-bonded non-woven fabrics, hot rolled non-woven fabrics and pure cotton non-woven fabrics. The linear density of the cotton fibers is 1.54-2.5 dtex, and after degreasing and bleaching, the spunlace fabric prepared by the method has the texture inferior to that of silk spunlace fabric, the spunlace fabric made of all-cotton materials can be used on the surface of a sanitary towel, the wear resistance is good, the combination between fibers is loose and thick, the water absorption is good, and the spunlace fabric is applied to a surface layer of the sanitary towel, has rapid absorption of menstrual blood, is wet after use, is not dry and comfortable, and is not soft and comfortable enough.

The silk is continuous long fiber formed by coagulating silk liquid secreted by a mature silkworm during cocooning, is also called natural silk, is also a natural fiber, and is rich in 18 amino acids beneficial to human bodies. The silk is the lightest, the softest and the thinnest natural fiber in nature, can be easily recovered to the original shape after external force is removed, and the inner tube does not cake, is not stuffy, does not shrink together, is uniform and soft, and can be permanently used without turning over.

The fiber linear density of the silk fiber is 0.9-1.6 dtex, the fibers are tightly combined, the water absorption is poor after the spun-laced non-woven fabric is prepared, although the texture is soft and comfortable, the menstrual blood infiltration speed is low when the spun-laced non-woven fabric is applied to a surface layer of a sanitary towel, and the side leakage is easily caused. Meanwhile, silk fibers are easier to generate static electricity than cotton fibers, serious flying is easy to form in the production process, the uniformity of the fiber web is affected, and the problem of fiber static electricity needs to be solved in the production process.

At present, the technology of mixing silk fibers and cotton fibers to prepare a non-woven fabric is immature in the market, and CN201721450852.6 discloses a high-water-absorptivity silk non-woven fabric which comprises a first silk non-woven fabric layer, a carbon fiber non-woven fabric layer, a water-absorbent resin fiber non-woven fabric layer, a cotton fiber non-woven fabric layer and a second silk non-woven fabric layer.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a preparation method and application of a composite non-woven fabric.

A first object of the present invention is to provide a composite nonwoven fabric.

The second purpose of the invention is to provide a preparation method of the composite non-woven fabric.

The third purpose of the invention is to provide the composite non-woven fabric prepared by the preparation method.

The fourth purpose of the invention is to provide the application of the composite non-woven fabric in the preparation of disposable sanitary products.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the invention provides a non-woven fabric consisting of a silk fiber net layer and a cotton fiber net layer, which adopts a half-crossed parallel lapping technology, wherein a silk layer is directly lapped and a pure cotton layer is fully crossed, and the specific preparation process is as shown in figure 1.

Therefore, the invention claims a composite non-woven fabric, which is prepared by laying a silk fiber net layer and a cotton fiber net layer through a spunlace process, wherein the silk layer is a straight laying net, and the pure cotton layer is a full-cross laying net.

Preferably, the silk fiber net layer is laid into two layers, and the gram weight of the silk fiber net layer is 10 +/-2 g/m²(ii) a Four layers of cotton fiber net layer are laid, and the gram weight of the cotton fiber net layer is 23 +/-2 g/m²。

The invention further claims a preparation method of the composite non-woven fabric, which comprises the following steps:

s1, silk fiber pretreatment: silk fiber is evenly sprayed with oil agent containing antistatic agent,

the pretreatment of the silk fiber aims to solve the problem of static electricity, and serious fly is easily formed in the production process under the condition of nonuse, so that the uniformity of the fiber web is influenced;

s2, preparing a silk fiber net: sequentially carrying out preliminary opening, fine opening, fiber decomposition and combing treatment on the pretreated silk fibers, carrying out single fiber formation, sending the obtained product into a cotton storage box and a carding machine for uniformly and directly laying the obtained product into a net, wherein the pressure in the cotton storage box is 800-850 Pa, the feeding speed of a cotton feeding roller of the carding machine is 0.4-0.50 m/min, the speed of a cylinder is 700-1200 m/min, the speed of an output fiber net is 30-40 m/min,

these parameters were chosen to ensure the quality of the silk fibres laid, the average length of the silk fibres produced to be laid was 38mm,the average fineness is 1.46dtex, and the gram weight of the silk fiber net layer is 10 +/-2 g/m²；

S3, preparing a cotton fiber net:

1) sequentially removing big impurities and heavy impurities in cotton fibers, preliminarily opening, removing foreign fibers, finely opening and reducing fine impurities, finely carding, sending into a cotton storage box and a carding machine to form a uniform net, wherein the pressure of the cotton storage box is 850-900 Pa, the feeding speed of a cotton roller by the carding machine is 1.10-1.30 m/min, the speed of a cylinder is 900-1200 m/min, the speed of an output fiber net is 40-45 m/min,

2) the two layers of cotton fiber webs are overlapped into 4 layers through full-crossing lapping, then drafting is carried out, the drafting multiple is divided into 7 levels, the drafting multiple of each level is 1.02-1.10, the drafting ratio is 1.4-2.2,

the web thickness fed into the drafting machine is reduced, the drafting multiple is adjusted, the gram weight of the web is controlled, the quality of the web-formed cotton fiber is ensured, and the gram weight of the prepared cotton fiber web layer is 23 +/-2 g/m²The unevenness of the output cotton fiber net is 4.0-5.0%;

s4, hydroentangling and reinforcing the composite fiber web: the prepared 4 layers of cross cotton fiber nets and 2 layers of straight silk fiber nets are laid together to prepare a composite fiber net, silk nets are arranged on the cotton fiber nets, and the composite fiber net is reinforced into composite spunlace non-woven fabrics through prewetting, spunlace and vacuum suction;

s5, degreasing and bleaching: putting the mixture into a pressure container with the temperature of 100-105 ℃ and the pressure of 5MPa, sequentially adding a refining agent F402-3 g/L, sodium silicate 0.4-0.7 g/L, 32% (w/v) sodium hydroxide 6-8 g/L and 27.5% (v/v) hydrogen peroxide 12-16 g/L, degreasing and bleaching for 1-3 h, and adding 0.6-0.8 g/L citric acid for neutralization.

Silicates are used here as stabilizers;

s6, drying: the spunlaced silk and cotton composite non-woven fabric quickly discharges water remained in the non-woven fabric material through negative pressure vacuum suction, roller pre-drying and a rotary screen hot air penetrating type dryer. The two layers of cotton fiber nets are overlapped into 4 layers through full-crossing lapping, then the two layers of cotton fiber nets are combined with 2 layers of directly-paved silk fiber nets to carry out composite fiber net spunlace entanglement reinforcement, and the composite non-woven fabric prepared after degreasing, bleaching and drying enables performance indexes of the prepared non-woven fabric to be more advantageous, and particularly the absorptivity of the non-woven fabric is remarkably superior to that of the non-woven fabric prepared by carrying out composite fiber net spunlace entanglement reinforcement on the 4 layers of cotton fiber nets and the 2 layers of directly-paved silk fiber nets.

Preferably, silk fiber is pretreated, and oil is sprayed on the silk fiber under the conditions that the ambient temperature is 22-28 ℃ and the humidity is 52-60%.

Preferably, silk fiber is pretreated, and the silk fiber is uniformly sprayed with a spraying oil agent containing an antistatic agent and is treated for 24-48 hours.

Preferably, the antistatic agent in the oil: the mass ratio of the water is 1: 3-10.

More preferably, the antistatic agent: the mass ratio of the water is 1: 6.

Preferably, the oil is sprayed for 36 hours.

Preferably, according to the oil agent: silk fiber is 1: 20-100 mass ratio of oil solution.

More preferably, as an oil agent: silk fiber is 1: an oil agent was used at a mass ratio of 30.

Preferably, the antistatic agent is type S10.

Preferably, a silk fibre web is prepared and/or a cotton fibre web is prepared, the feed being grabbed with a disc plucker.

Preferably, the silk fiber net and/or the cotton fiber net are prepared, and the cotton storage box is a ZGB1026 type cotton storage box.

Preferably, a silk fiber web is prepared and is delivered to a FA106 opener for fine opening by means of an air stream.

Preferably, a silk fiber web is prepared and finely carded using a ZWF1206 type pre-carding machine to be single-fibrillated.

Preferably, the silk fiber net is prepared, the pressure in a cotton storage box is 820Pa, a ZGB1213 carding machine is used for uniformly and directly laying the silk fiber net into the net, the feeding speed of a cotton feeding roller of the carding machine is 0.5m/min, the cylinder speed is 1000m/min, and the output fiber net speed is 35 m/min.

Preferably, a cotton fiber web is prepared and the air stream is sent to an JWF1011 multifunctional separator to remove large and heavy impurities from the cotton fibers.

Preferably, a cotton web is prepared and subjected to preliminary opening using an JWF1012 single axial flow opener.

Preferably, a cotton fiber web is prepared, and the cotton flow after the primary opening is passed through a genius 8 foreign fiber machine to remove foreign fibers in the cotton fibers.

Preferably, the cotton fiber web is prepared, mixed by an JWF1022 multi-bin cotton mixer and then sent to a JWF1124 fine cotton opener for fine opening, discharging and reducing impurities.

Preferably, a cotton web is prepared and subjected to fine carding using a pre-carding machine of the type ZWF 1206.

Preferably, a cotton fiber web is prepared, and two cotton fiber webs are overlapped by full cross lapping using a cross lapping machine of W1251C type.

Preferably, a cotton fiber net is prepared, the pressure of a cotton box is 880Pa, a ZGB1213 type carding machine is adopted for uniformly forming the net, the feeding speed of a cotton feeding roller is 1.20m/min, the cylinder speed is 1000m/min, and the output fiber net speed is 42 m/min.

Preferably, a cotton web is prepared with a draft multiple per stage in the range of 1.05.

After the two fiber nets from the carding machine are subjected to full-cross lapping, the two fiber nets are overlapped into 4 layers, and the lapping machine changes the arrangement orientation of cotton fibers and improves the longitudinal and transverse strength of the cloth cover.

Preferably, the cotton fiber web is prepared, and the cotton fiber web after full-cross lapping is sent to a 21-roller drawing machine of W1168 for drawing.

Preferably, the preparation of the cotton fiber net is carried out in an environment with the moisture regain of 6-8%.

The moisture regain is too low, the fiber is easy to break and generate static electricity, the moisture regain is too high, the fiber is easy to wind, and the carding is difficult.

Preferably, the hydroentanglement consolidation compounding is carried out with a vacuum suction pressure of 8000 Pa.

Preferably, the pre-wetting adopts a steel wire mesh drum clamping mode, a single-drainage pricking plate with the thickness of 0.12mm is used, and the pressure of a pre-wetting water pricking head is controlled within 4 kg.

Preferably, the spunlace process adopts a mode of adding a rear platform to a front rotary drum and a rear rotary drum, 4 groups of spunlace heads are used together, the aperture of each spunlace head is 0.12mm, the pressure of each spunlace head of 2 groups of rotary drums is 15-25 bar and 20-25 bar respectively, and the pressure of each spunlace head of 2 groups of rotary drums is 30-35 bar and 15-20 bar respectively.

More preferably, the pressure of the water-jet heads of the front drum 2 group is 17bar and 20bar respectively, and the pressure of the water-jet heads of the rear drum 2 group is 33bar and 18bar respectively.

Preferably, the winding speed is 80-150 m/min and the drying temperature is 130-150 ℃ in the drying process.

Preferably, degreasing and bleaching are carried out for 2 h.

Preferably, the dried product is cut according to the required width specification, and wound into a circular cloth roll for use.

The invention also claims the composite non-woven fabric prepared by the preparation method.

The invention also claims the application of the composite non-woven fabric in the preparation of disposable sanitary products.

Preferably, the disposable sanitary article is a sanitary napkin. Including, but not limited to, sanitary napkins, wet wipes, diapers, urine-barrier pads, and the like.

More preferably, the sanitary napkin is prepared by using the composite nonwoven fabric as a surface layer.

More preferably, the surface with high silk content of the composite non-woven fabric is in contact with the skin, and the surface with high cotton fiber content is in contact with the diversion layer of the sanitary towel.

Compared with the prior art, the invention has the following beneficial effects:

the composite non-woven fabric prepared by the invention avoids the problems that the combination of silk fibers is tight, the water absorption is poor, the composite non-woven fabric is applied to a surface layer of a sanitary towel, the infiltration speed of menstrual blood is low, side leakage is easy to cause and the like; meanwhile, the problem that the spunlace fabric made of the single common cotton fiber after degreasing and bleaching is not soft and comfortable enough is solved.

After the sanitary towel is prepared by the silk layer, the silk layer contacts with the skin, and the longitudinally arranged fibers are easy to longitudinally diffuse menses and are not easy to leak laterally; the pure cotton layer contacts with the flow guide layer of the sanitary towel, so that the menstrual blood is easy to seep downwards and spread to the periphery, the safety and the absorbability of the sanitary towel are enhanced, and the problem of side leakage of the menstrual blood is solved. Meanwhile, indexes such as the absorption speed, the reverse osmosis amount and the like of the sanitary towel made of the composite non-woven fabric are obviously superior to those of other materials (pure cotton surface layers and silk-cotton blended fabrics).

The invention adopts a semi-cross parallel lapping technology and a new technology formed by compounding a straight lapping technology and a full-cross lapping technology, the semi-cross parallel lapping technology integrates the advantages of the straight lapping technology and the full-cross lapping technology, the non-woven fabric has better uniformity and the adjustable range of longitudinal and transverse strength is large.

Drawings

FIG. 1 is a flow chart of a method for preparing a composite nonwoven fabric.

FIG. 2 is a schematic diagram of a half-crossover process.

Detailed Description

The invention is described in further detail below with reference to the drawings and specific examples, which are provided for illustration only and are not intended to limit the scope of the invention. The test methods used in the following examples are all conventional methods unless otherwise specified; the materials, reagents and the like used are, unless otherwise specified, commercially available reagents and materials.

Antistatic agent S10, refining agent F40, purchased from Ningbo Mijie textile materials, Inc.

Example 1A method for preparing a composite nonwoven fabric

(1) Pretreatment of silk fibers

Spraying an oil agent to the silk fiber under the conditions that the ambient temperature is 25 ℃ and the humidity is 55%, wherein the main component of the oil agent is an antistatic agent (model: S10), and the weight ratio of the oil agent is as follows: water was mixed at a ratio of 1:6 and used as an oil: the silk fibres were sprayed evenly in a ratio of 1:30 onto the fibres and treated for 36 hours.

(2) Preparing silk fiber net

The method comprises the steps of adopting pretreated 100% natural silk fibers, grabbing feed by a disc plucker, primarily opening the silk fibers, conveying the silk fibers to an FA106 opener by air flow, carrying out fine opening to further decompose the silk, feeding the decomposed silk into a ZWF1206 type pre-carding machine for fine carding to enable the silk to be single-fiberized, collecting, storing and ZGB1026 type cotton storage box, uniformly and directly laying the pressure of 820Pa in the cotton storage box, using a ZGB1213 carding machine to form a net, and feeding the cotton roller by the carding machine at a speed of 0.5m/min, using a cylinder at a speed of 1000m/min and outputting the net at a speed of 35 m/min.

The average length of the silk fiber of the net formation is 38mm, the average fineness is 1.46dtex, and the gram weight of the silk fiber net layer is 10 plus or minus 2g/m²。

(3) Preparation of Cotton fiber Web

The preparation of the cotton fiber net is carried out in the environment with the moisture regain of 7%, 100% natural cotton fibers are fed by grabbing of a disc plucker, conveyed to a JWF1011 multifunctional separator by air flow, large impurities and heavy impurities in the cotton fibers are removed, conveyed to a JWF1012 single-axial-flow opener for preliminary opening, the opened cotton flow passes through a genizer 8 foreign fiber machine, foreign fibers in the cotton fibers are removed, mixed by a JWF1022 multi-bin cotton mixer and then conveyed to a JWF1124 fine cotton opener, the cotton flow is subjected to fine opening, fine impurities are reduced, and the cotton flow enters a ZWF1206 type pre-carding machine for fine carding. After carding, the cotton is sent to a ZGB1026 type cotton storage box, the pressure of the cotton storage box is 880Pa, a ZGB1213 type carding machine is adopted to uniformly form a net, the feeding speed of a cotton feeding roller is 1.20m/min, the cylinder speed is 1000m/min, and the output fiber net speed is 42 m/min.

After exiting the carding machine, the card was fed into a W1251C cross lapper for full cross lapping to form a 4-layer web (as shown in fig. 2, a straight lapping process was performed at the beginning and perpendicular to the machine running direction, and the web was two webs from the carding machine, and after full cross lapping, the two webs were overlapped to form 4 layers.) the lapping width was 2.6 m. The lapping machine changes the arrangement orientation of cotton fiber and improves the vertical and horizontal strength of the cloth cover. The crosslapped web was fed to a W1168 type 21-roll drafting machine with a draft multiple of 7 stages, the draft multiple of each stage was 1.05 (web thickness fed to the drafting machine, web thickness was reduced by the drafting machine), and the draft ratio of the drafting machine was 1.8.

The unevenness of the output cotton fiber web is 4.5 percent, and the gram weight of the prepared cotton fiber web layer is 23 +/-2 g/m²。

(4) Composite fiber web spunlace entanglement reinforcement

The prepared 4 layers of cross cotton fiber nets and 2 layers of straight silk fiber nets are laid together to prepare a composite fiber net, the silk net is arranged on the cotton fiber net, and the composite fiber net is reinforced into a composite spunlace non-woven fabric through prewetting, spunlacing and vacuum suction (the vacuum pressure is 8000 Pa); the pre-wetting adopts a steel wire mesh drum clamping mode, a single drainage pricking plate with the thickness of 0.12mm is used, and the pressure of a pre-wetting water pricking head is controlled within 4 bar. The spunlace process adopts a mode of adding two rotary drums and a rear platform, 4 groups of spunlace heads are used together, the aperture of each spunlace head is 0.12mm, 2 spunlace heads of each rotary drum are respectively provided with 17bar and 20bar of pressure of the spunlace heads of the front rotary drum 2 group, and 33bar and 18bar of pressure of the spunlace heads of the rear rotary drum 2 group.

(5) Degreasing and bleaching

The composite spunlace non-woven fabric is wound into a fabric, then the fabric is placed into a pressure container with the temperature of 100-105 ℃ and the pressure of 0.5MPa, 2.5g/L of a refining agent (purchased finished product), 0.6g/L of a stabilizing agent (sodium silicate), 7g/L of 32% (w/v) sodium hydroxide and 14g/L of 27.5% (v/v) hydrogen peroxide are sequentially added, degreasing and bleaching are carried out for 2h, and 0.7g/L of citric acid is added for neutralization.

(6) Drying by baking

The spunlaced silk and cotton composite non-woven fabric quickly discharges water remained in the non-woven fabric material through negative pressure vacuum suction, roller pre-drying and a rotary screen hot air penetrating type dryer; the winding speed is 120m/min, and the drying temperature is 140 ℃.

(7) Slitting package

Cutting according to the required width specification, and winding into a circular cloth roll for use.

Example 2 preparation method of composite nonwoven fabric

(1) Pretreatment of silk fibers

Spraying an oil agent to the silk fiber under the conditions that the ambient temperature is 22 ℃ and the humidity is 52%, wherein the main component of the oil agent is an antistatic agent (model: S10), and the weight ratio of the oil agent is as follows: water was mixed at a ratio of 1:3 and used as an oil: the silk fibres were sprayed evenly in a ratio of 1:20 onto the fibres and treated for 24 hours.

(2) Preparing silk fiber net

The method comprises the steps of adopting pretreated 100% natural silk fibers, grabbing feed by a disc plucker, primarily opening the silk fibers, conveying the silk fibers to an FA106 opener by air flow, carrying out fine opening to further decompose the silk, feeding the decomposed silk into a ZWF1206 type pre-carding machine for fine carding to enable the silk to be single-fiberized, collecting, storing and ZGB1026 type cotton storage box, uniformly and directly laying the silk in the cotton storage box at a pressure of 800Pa by a ZGB1213 carding machine, wherein the feeding speed of a cotton feeding roller of the carding machine is 0.4m/min, the cylinder speed is 700m/min, and the output fiber web speed is 30 m/min.

The average length of the silk fiber of the net formation is 38mm, the average fineness is 1.46dtex, and the gram weight of the silk fiber net layer is 10 plus or minus 2g/m²。

(3) Preparation of Cotton fiber Web

The preparation of the cotton fiber net is carried out in the environment with the moisture regain of 6-8%, 100% natural cotton fibers are fed by a disc plucker, conveyed to a JWF1011 multifunctional separator by air flow, removed of large impurities and heavy impurities in the cotton fibers, conveyed to a JWF1012 single-axial-flow opener for preliminary opening, opened cotton flow passes through a genizer 8 foreign fiber machine, foreign fibers in the cotton fibers are removed, mixed by a JWF1022 multi-bin cotton mixer and then sent to a JWF1124 fine cotton opener, fine opening and fine impurity reduction are carried out on the cotton flow, and the cotton flow enters a ZWF1206 type pre-carding machine for fine carding. After carding, the cotton is sent to a ZGB1026 type cotton storage box, the pressure of the cotton storage box is 850Pa, a ZGB1213 type carding machine is adopted to uniformly form a net, the feeding speed of a cotton feeding roller is 1.10m/min, the cylinder speed is 900m/min, and the output fiber net speed is 40 m/min.

The grammage of the web layer of the laid cotton fiber is 23 +/-2 g/m²。

After the carding machine comes out of the net, the card enters a W1251C type cross lapping machine for full cross lapping to be lapped into 4 layers of fiber webs (as shown in figure 2, a straight lapping process is carried out at the beginning and is vertical to the running direction of the equipment, the fiber webs are two layers of fiber webs coming out of the carding machine, after full cross lapping, the two layers of fiber webs are overlapped to be 4 layers), and the lapping width is 2.5 m. The lapping machine changes the arrangement orientation of cotton fiber and improves the vertical and horizontal strength of the cloth cover. The crosslapped cotton web is sent to a W1168 type 21-roller drafting machine, the drafting multiple is divided into 7 levels, the drafting multiple range of each level is 1.02 (the cotton web fed into the drafting machine is thick, the cotton web is thinned through the drafting machine), and the drafting ratio of the drafting machine is 1.4.

The unevenness of the output cotton fiber web is 4.0-5.0%, and the gram weight of the prepared cotton fiber web layer is 23 +/-2 g/m²。

(4) Composite fiber web spunlace entanglement reinforcement

The prepared 4 layers of cross cotton fiber nets and 2 layers of straight silk fiber nets are laid together to prepare a composite fiber net, the silk net is arranged on the cotton fiber net, and the composite fiber net is reinforced into a composite spunlace non-woven fabric through prewetting, spunlacing and vacuum suction (the vacuum pressure is 8000 Pa); the pre-wetting adopts a steel wire mesh drum clamping mode, a single drainage pricking plate with the thickness of 0.12mm is used, and the pressure of a pre-wetting water pricking head is controlled within 4 bar. The spunlace process adopts a mode of adding two rotary drums and a rear platform, 4 groups of spunlace heads are used together, the aperture of each spunlace head is 0.12mm, 2 spunlace heads of each rotary drum are respectively provided with 15bar and 20bar of pressure of the spunlace heads of the front rotary drum 2 group, and 30bar and 15bar of pressure of the spunlace heads of the rear rotary drum 2 group.

(5) Degreasing and bleaching

The composite spunlace non-woven fabric is wound into a fabric, then the fabric is placed into a pressure container with the temperature of 100 ℃ and the pressure of 5MPa, 2g/L of refining agent (purchased finished product), 0.4g/L of stabilizing agent (sodium silicate), 6g/L of 32% (w/v) sodium hydroxide and 12g/L of 27.5% (v/v) hydrogen peroxide are sequentially added, degreasing and bleaching are carried out for 2h, and 0.6g/L of citric acid is added for neutralization.

(6) Drying by baking

The spunlaced silk and cotton composite non-woven fabric quickly discharges water remained in the non-woven fabric material through negative pressure vacuum suction, roller pre-drying and a rotary screen hot air penetrating type dryer; the winding speed is 80m/min, and the drying temperature is 130 ℃.

(7) Slitting package

Cutting according to the required width specification, and winding into a circular cloth roll for use.

Example 3 preparation method of composite nonwoven fabric

(1) Pretreatment of silk fibers

Spraying an oil agent to the silk fiber under the conditions that the ambient temperature is 28 ℃ and the humidity is 60%, wherein the main component of the oil agent is an antistatic agent (model: S10), and the weight ratio of the oil agent is as follows: water was mixed at a ratio of 1:10 and used as an oil: the silk fiber was sprayed evenly on the fiber in a ratio of 1:100 and treated for 48 hours.

(2) Preparing silk fiber net

Adopting pretreated 100% natural silk fiber, grabbing feed by using a disc plucker, primarily opening the silk fiber, conveying the silk fiber to an FA106 opener by using air flow, carrying out fine opening, further decomposing the silk, feeding the decomposed silk into a ZWF1206 type pre-carding machine for fine and fine carding, enabling the silk to be single-fiberized, collecting, storing and ZGB1026 type cotton storage box, uniformly and directly laying the pressure in the cotton storage box at 850Pa by using a ZGB1213 carding machine to form a net, wherein the feeding speed of a cotton feeding roller of the carding machine is 0.50m/min, the cylinder speed is 1200m/min, and the output fiber net speed is 40 m/min.

The average length of the silk fiber of the net formation is 38mm, the average fineness is 1.46dtex, and the gram weight of the silk fiber net layer is 10 plus or minus 2g/m²。

(3) Preparation of Cotton fiber Web

The preparation of the cotton fiber net is carried out in the environment with the moisture regain of 6-8%, 100% natural cotton fibers are fed by a disc plucker, conveyed to a JWF1011 multifunctional separator by air flow, removed of large impurities and heavy impurities in the cotton fibers, conveyed to a JWF1012 single-axial-flow opener for preliminary opening, opened cotton flow passes through a genizer 8 foreign fiber machine, foreign fibers in the cotton fibers are removed, mixed by a JWF1022 multi-bin cotton mixer and then sent to a JWF1124 fine cotton opener, fine opening and fine impurity reduction are carried out on the cotton flow, and the cotton flow enters a ZWF1206 type pre-carding machine for fine carding. After carding, the cotton is sent to a ZGB1026 type cotton storage box, the pressure of the cotton storage box is 900Pa, a ZGB1213 type carding machine is adopted to uniformly form a net, the feeding speed of a cotton feeding roller is 1.30m/min, the cylinder speed is 1200m/min, and the output fiber net speed is 45 m/min.

After exiting the carding machine, the card was fully cross lapped by a cross lapping machine of W1251C type to form a 4-layer web (as shown in fig. 2, a straight lapping process was performed at the beginning and perpendicular to the running direction of the apparatus, and the two webs at this time were two webs from the carding machine, and after the full cross lapping, the two webs were overlapped to form 4 layers.) the lapping width was 2.7 m. The lapping machine changes the arrangement orientation of cotton fiber and improves the vertical and horizontal strength of the cloth cover. The crosslapped web was fed to a W1168 type 21-roll drafting machine with a draft multiple of 7 stages, with the draft multiple of each stage ranging from 1.10 (the web fed to the drafting machine was thick and thinned by the drafting machine).

The unevenness of the output cotton fiber web is 4.0-5.0%, and the gram weight of the prepared cotton fiber web layer is 23 +/-2 g/m²。

(4) Composite fiber web spunlace entanglement reinforcement

The prepared 4 layers of cross cotton fiber nets and 2 layers of straight silk fiber nets are laid together to prepare a composite fiber net, the silk net is arranged on the cotton fiber net, and the composite fiber net is reinforced into a composite spunlace non-woven fabric through prewetting, spunlacing and vacuum suction (the vacuum pressure is 8000 Pa); the pre-wetting adopts a steel wire mesh drum clamping mode, a single drainage pricking plate with the thickness of 0.12mm is used, and the pressure of a pre-wetting water pricking head is controlled within 4 bar. The spunlace process adopts a mode of adding two rotary drums and a rear platform, 4 groups of spunlace heads are used together, the aperture of each spunlace head is 0.12mm, 2 spunlace heads of each rotary drum are respectively provided with 5bar and 25bar of pressure of the spunlace heads of the front rotary drum 2 group, and 35bar and 20bar of pressure of the spunlace heads of the rear rotary drum 2 group.

(5) Degreasing and bleaching

The composite spunlace non-woven fabric is wound into a fabric, then the fabric is placed into a pressure container with the temperature of 105 ℃ and the pressure of 5MPa, 3g/L of refining agent (purchased finished product), 0.7g/L of stabilizing agent (sodium silicate), 8g/L of 32% (w/v) sodium hydroxide and 16g/L of 27.5% (v/v) hydrogen peroxide are sequentially added, degreasing and bleaching are carried out for 2h, and 0.8g/L of citric acid is added for neutralization.

(6) Drying by baking

The spunlaced silk and cotton composite non-woven fabric quickly discharges water remained in the non-woven fabric material through negative pressure vacuum suction, roller pre-drying and a rotary screen hot air penetrating type dryer; the winding speed is 150m/min, and the drying temperature is 150 ℃.

(7) Slitting package

Cutting according to the required width specification, and winding into a circular cloth roll for use.

Comparative example 1 preparation method of pure cotton spunlace nonwoven fabric

The difference from the example 1 is that the silk fiber is not contained, and pure cotton feed is adopted to prepare pure cotton non-woven fabrics:

the cotton fiber is grabbed by a disc plucker to feed, and is conveyed to a JWF1011 multifunctional separator by air flow to remove large impurities and heavy impurities in the cotton fibers, and is conveyed to a JWF1012 single-axial-flow cotton opener to be primarily opened, the opened cotton flow passes through a genium 8 foreign fiber machine to remove foreign fibers in the cotton fibers, and is mixed by a JWF1022 multi-bin cotton mixer and then is conveyed to a JWF1124 fine cotton opener to finely open the cotton flow, finely reduce the impurities, and then enters a ZWF1206 type pre-carding machine to be finely carded.

After carding, the cotton is respectively sent to two ZGB1026 type cotton storage boxes, one is uniformly laid into a net by adopting a ZGB1213 type carding machine according to the silk straight laying process in the embodiment 1, the other is uniformly laid into a net by adopting a ZGB1213 type carding machine, the net is laid into a W1251C type full-crossed net according to the cotton fiber process in the embodiment 1, other spunlace and drying processes are the same, and the degreasing and bleaching process without silk components is different. The degreasing and bleaching process comprises the following steps: the composite spunlace non-woven fabric is wound into a fabric, then the fabric is placed into a pressure container with the temperature of 100-105 ℃ and the pressure of 0.5MPa, 0.7g/L stabilizer (sodium silicate), 10g/L sodium hydroxide (32%), 16g/L hydrogen peroxide (27.5%), degreasing and bleaching for 2h, and adding 1.0g/L citric acid for neutralization.

Comparative example 2 preparation method of silk and cotton blended spunlace nonwoven fabric

The difference from the embodiment 1 is that the pretreated silk fiber is not fed into a net independently, but is fed after being mixed with the cotton fiber according to the mass ratio of 3:7, the mixture is conveyed to a JWF1011 multifunctional separator by using air flow to remove the heavy impurities and heavy impurities in the cotton fiber, the mixture is conveyed to an JWF1012 single-axial flow opener for preliminary opening, the opened cotton flow passes through a genizer 8 foreign fiber machine to remove the foreign fibers in the cotton fiber, the mixture is conveyed to a JWF1124 fine cotton opener after being mixed by a JWF1022 multi-bin cotton mixer, the cotton flow is finely opened, the fine impurities are reduced, and the cotton flow enters a ZWF1206 type pre-carding machine for fine carding.

After carding, the cotton is respectively sent to two ZGB1026 type cotton storage boxes, one is uniformly laid into a net by adopting a ZGB1213 type carding machine according to the silk straight laying process in the embodiment 1, the other is uniformly laid into a net by adopting a ZGB1213 type carding machine, the net is laid into a W1251C type full-cross lapping according to the cotton fiber process in the embodiment 1, and other spunlace, degreasing bleaching and drying processes are the same.

Application example 1

The nonwoven fabrics prepared in examples 1 to 3 and comparative examples 1 and 2 were examined for softness, longitudinal tensile strength, longitudinal elongation, transverse tensile strength, transverse elongation, caliper and water absorption rate. The detection method refers to GB/T24218.1-2009, GB/T24218.2-2009, GB/T24218.3-2010, GB/T24218.6-2010 and GB/T8942-2002.

The results are shown in Table 1.

Table 1:

after the water absorption speed is higher than 80mm/5min, the cloth cover generally absorbs too much water, and the surface is wet when the sanitary towel is used for preparing the sanitary towel in the later period; after the water absorption speed is less than 80mm/5min, the cloth cover generally shows stronger water absorption, and the surface is drier and comfortable when the sanitary towel is used for preparing the sanitary towel in the later period. The water absorption speed of the non-woven fabrics prepared in the examples 1 to 3 is 71-73 mm/5 min. The composite non-woven fabric prepared by the invention has the advantages of fast water absorption and good softness, and is more suitable for preparing sanitary towels.

Application example 2

Sanitary napkins were prepared by using the nonwoven fabrics prepared in examples 1 to 3 and comparative examples 1 and 2 as sanitary napkin facing layers, and the side with high silk content of examples 1 to 3 was in contact with the skin and the side with high cotton fiber content was in contact with the sanitary napkin flow guide layer.

And detecting the absorption speed and the reverse osmosis amount of the prepared sanitary towel. The detection method is described in GB/T8939-2018, GB/T28004-2011.

The results are shown in Table 2.

Table 2:

the detection results can show that the non-woven fabric prepared by the invention is applied to the sanitary towel, the absorption speed is faster than the proportion, the non-woven fabric has good dry and comfortable effect, the reverse osmosis amount is obviously smaller than the proportion, and the occurrence of side leakage can be reduced.