Manufacturing process of waterproof and moisture permeable fabric

Abstract

The invention discloses a manufacturing process of a waterproof and moisture-permeable fabric. The manufacturing process comprises the following steps: connecting cloth, desizing, dyeing, washing and drying, performing in-process inspection, sprinkling water and shaping, calendaring, performing surface treatment (corona), compounding and performing finished inspection. In order to guarantee the adhesion function and washing resistance of the fabric, water sprinkling equipment is modified, a water sprinkling tank is modified into a one-way spraying mode, water sprinkling treatment is conducted on the front face of the fabric, and therefore the one-way water repellent effect is achieved, the back face of the fabric does not contain a water sprinkling agent, the surface tension of the back face of the fabric is reduced, adhesion of the fabric and PUR hot melt adhesive is improved, and the water sprinkling effect is improved. Then the fabric is calendered, corona treatment is carried out, the surface roughness and specific surface area of the fabric are improved, the adhesive dispensing amount is increased, and meanwhile the adhesion and washability of the fabric are improved. Therefore, the adhesion of the fabric is ensured, and during compounding, the glue penetration risk of the fabric is controlled by reducing the depth of the glue penetrating into the fabric.

Description

Technical Field

[0001] The invention relates to the technical field of textile fabrics, in particular to a manufacturing process of waterproof and breathable fabrics. Background Art

[0002] Jackets are one of the essential equipment for most outdoor sportsmen because of their waterproof and breathable properties. At present, the fabrics of most jackets on the market are relatively thick and not suitable for outdoor sports in spring and summer. Therefore, thin and light jackets are very popular and attract much attention in the market in spring and summer. However, due to technical limitations, for example, the traditional water-repellent finishing is to pass all the fabrics through the additive tank, and then squeeze out the excess additives under the pressure of the upper and lower PADDA rollers (made of nylon), so that all the fibers of the fabric can contact the water-repellent, thereby achieving a two-way water-repellent effect. However, this method will reduce the surface tension of the back of the fabric, which is not conducive to the subsequent fabric composite bonding. At present, the common thin and light fabrics on the market have problems such as poor bonding, poor water resistance, and glue penetration in the traditional composite process.

[0003] In order to overcome the problems of poor bonding, poor water washing resistance, and easy glue penetration of thin fabrics, the present invention, through in-depth research on the manufacturing process of waterproof and breathable fabrics, proposes a process that can improve the problems of poor bonding, poor water washing resistance, and easy glue penetration of low-denier thin fabrics. Summary of the invention

[0004] The purpose of the present invention is to provide a manufacturing process for waterproof and breathable fabrics, so as to improve the problems of poor bonding, poor water resistance and easy glue penetration of existing thin fabrics.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A process for manufacturing a waterproof and breathable fabric comprises the following steps:

[0007] Fabric: Choose low denier fabric;

[0008] Desizing: Desizing the low-denier fabric after joining through the desizing tank;

[0009] Dyeing: dye the desized fabric;

[0010] Washing and drying: wash and dry the dyed cloth;

[0011] Mid-term inspection: inspect the quality of dyed fabrics;

[0012] Spraying and shaping: The additives are loaded into the spraying equipment, which has 20-24 spray holes. The spray holes are at a 90° angle to the running direction of the fabric and parallel to the weft direction of the fabric. During operation, all the spray holes spray the front side of the fabric in a fan-shaped manner, so that the additives are completely covered on the front side of the fabric, and the back side of the fabric is not covered with additives; the spraying amount of the spraying equipment is controlled at 30g / m 2 -35g / m 2 , so that the additives penetrate 1 / 3-1 / 2 of the fabric thickness without reaching the reverse side of the fabric;

[0013] Calendering: Calender the reverse side of the fabric;

[0014] Surface corona treatment: The reverse side of the fabric is treated with corona discharge to break the molecular chemical bonds of the fabric and introduce free radicals and hydrophilic groups into the surface of the fabric;

[0015] Composite: The waterproof and breathable polyurethane film is composited with the reverse side of the fabric through PUR hot melt adhesive;

[0016] Finished product inspection: Inspect the finished product after compounding.

[0017] Furthermore, in the fabric joining process, the fabric is selected to be nylon fabric with a denier number of 15D-20D and a yarn form of DTY.

[0018] Furthermore, in the water-spraying and shaping process, the vertical distance between the spray hole of the spraying equipment and the fabric is controlled at 1.5cm-2cm.

[0019] Furthermore, in the water-spraying and shaping process, the spraying equipment is simultaneously connected to the spray control panel to control the amount of additives used by adjusting the flow rate of the spray.

[0020] Furthermore, in the water-splashing setting process, the formula of the auxiliary agent is 0.5-1g / l of penetrant, 40-60g / l of water-splashing agent, 2-3g / l of bridging agent, 4-8g / l of softener, 0.5-1g / l of accelerator, and the setting conditions are 160°C*40m / min*width*3% overfeed.

[0021] Furthermore, in the calendering process, the calendering conditions are (140° C.-150° C.)*30 m / min*150 n / mm*1 time.

[0022] Furthermore, in the surface treatment corona process, the electrode gap of the corona treater is 1mm-1.25mm, the corona current is 4A-5A, and the voltage is controlled at 6000V-6500V.

[0023] Furthermore, in the laminating process, the PUR hot melt adhesive is placed on an engraving roller, and the PUR is transferred to the waterproof and breathable polyurethane film by the rotation of the engraving roller.

[0024] Furthermore, the engraving roller has diamond or circular patterns, a hole diameter of 0.30 mm to 0.32 mm, a hole depth of 0.03 mm to 0.035 mm, and a mesh size of 100 to 120 meshes.

[0025] Furthermore, in the composite process, the coating gap is -0.10 mm to -0.15 mm, the lamination gap is -0.15 mm to -0.18 mm, the dispensing amount is 6 g / y-8 g / y, and the speed is 10 m / min-12 m / min.

[0026] After adopting the above scheme, in order to ensure the bonding function and water washability of the fabric, the manufacturing process of a waterproof and breathable fabric of the present invention transforms the water splashing equipment, converts the water splashing trough into a one-way spraying method, and performs water splashing treatment on the front side of the fabric, thereby achieving a one-way water repellent effect, while the back side of the fabric does not contain a water splashing agent, so that the back side of the fabric maintains the original surface tension, improves the bonding between the fabric and the PUR hot melt adhesive, and then calenders the fabric, and then performs corona treatment to improve the roughness and specific surface area of ​​the fabric surface, and improves the bonding and washability of the fabric while increasing the amount of glue dispensed. In this way, the bonding of the fabric is guaranteed, and during compounding, the risk of glue penetration of the fabric is controlled by reducing the depth of the glue penetrating into the fabric. The low-denier fabric made by the manufacturing process of the waterproof and breathable fabric of the present invention can overcome the problems of poor bonding, poor water washability, and easy glue penetration of traditional thin and light fabrics. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0028] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0029] like Figure 1 As shown, the present invention discloses a manufacturing process of a waterproof and breathable fabric, which comprises the following steps:

[0030] Fabric: Select low denier fabric. In this embodiment, nylon DTY with a denier of 15D-20D is selected as the fabric. The fiber fineness of this fabric is very fine, and the fabric made is very light and thin, soft and smooth to the touch, and comfortable to wear. DTY fabric is a stretch-deformed yarn. It is stretched and false-twisted during the processing process and has unique fluffiness and elasticity. This elasticity allows the fabric to expand and contract with the movement of the body during wearing, and is not easy to produce a sense of restraint. It has good fit and sports adaptability. Nylon itself has high strength. Although the fiber of 15D-20D nylon DTY fabric is thin, it still has a certain strength, can withstand a certain tension and friction, and has good durability.

[0031] Desizing: The low-denier fabric after joining is passed through the desizing tank to remove the sizing and impurities on the fabric for subsequent dyeing.

[0032] Dyeing: Dye the desized fabric according to the required color.

[0033] Washing and drying: Wash and dry the dyed cloth to remove residual dyes or auxiliaries on the surface of the fabric.

[0034] Intermediate inspection: inspect the quality of the dyed fabrics.

[0035] Splashing and shaping: giving the fabric a water-repellent function. This step is the key improvement step of the present invention. In order to ensure the subsequent bonding function and water-washing resistance of the fabric, the present invention converts the splashing tank into a one-way spraying method, thereby achieving a one-way water-repellent effect.

[0036] The modified spraying equipment consists of 20-24 spray holes, which are at a 90° angle to the running direction of the fabric and parallel to the weft direction of the fabric. To ensure the spraying effect, the vertical distance between the spray hole and the fabric is controlled at 1.5cm-2cm. During operation, all the spray holes spray the front of the fabric in a fan-shaped manner, so that the additive is completely covered on the front of the fabric, and the back of the fabric will not be attached to the spray. The spraying equipment is also connected to the spray control panel, and the amount of additive is accurately controlled by adjusting the flow rate of the spray, so that the front of the fabric has a water-repellent effect, while the back is not affected.

[0037] The auxiliary agent formula for spraying the front side of the fabric by the spraying equipment in the present invention is:

[0038]

[0039]

[0040] At the same time, the spraying amount of the spraying equipment is controlled at 30g / m 2 -35g / m 2 Within this range, the fabric additives can penetrate into the depth of 1 / 3-1 / 2 of the fabric thickness without reaching the reverse side of the fabric. While making the fabric feel soft and improving the tearing strength of the fabric, it ensures the surface tension of the reverse side, which is beneficial to the subsequent lamination operation.

[0041] Calendering: Calendering the reverse side of the fabric to improve the density of the fabric, so that the rubber is not easy to penetrate into the fabric completely, resulting in the risk of glue penetration. This calendering process is a specially added process after the water-spraying shaping process to prevent the subsequent rubber from completely penetrating into the fabric. The water-spraying shaping process and the calendering process are coordinated to avoid the risk of glue penetration.

[0042] Calendering conditions: (140℃-150℃)*30m / min*150n / mm*1 time.

[0043] Surface treatment (corona): This process in the present invention is a treatment performed on the back side of the single-sided water-repellent fabric. By performing corona discharge treatment on the back side of the fabric, the chemical bonds of the fabric molecules are broken, thereby increasing the surface roughness and the specific surface area, thereby increasing the subsequent composite glue dispensing amount of the fabric and improving the adhesion of the fabric. Corona treatment will also introduce free radicals and hydrophilic groups to the surface of the fabric. After the dyed fabric is treated with single-sided water splashing, shaping and calendering, although the appearance and physical properties of the non-water splashed side are improved, the activity of the back side of the fabric still needs to be improved. Corona treatment can increase the surface energy of this side, break the molecular chains on the fiber surface and generate free radicals, which is greatly beneficial to improving the adhesion and moisture permeability of the fabric and improving its ability to combine with other substances.

[0044] In order to ensure the corona effect and avoid a significant decrease in the strength of the fabric, the electrode gap of the corona processor is 1mm-1.25mm, the corona current is 4A-5A, and the voltage is controlled at 6000V-6500V.

[0045] Composite: The waterproof and breathable polyurethane film is composited with the reverse side of the fabric by means of PUR hot melt adhesive. The PUR hot melt adhesive is placed on the engraving roller, and the PUR is transferred to the waterproof and breathable polyurethane film by the rotation of the engraving roller.

[0046] The engraving roller should have diamond or circular patterns, with a hole diameter of 0.30mm-0.32mm, a hole depth of 0.03mm-0.035mm, and a mesh size of 100-120.

[0047] The diamond pattern has a regular geometric shape, which can distribute the PUR hot melt adhesive more evenly on the surface of the engraved roller. When the engraved roller rotates, the glue will be distributed along the edges and corners of the diamond. When transferred to the waterproof and breathable polyurethane film, the glue can be attached to the waterproof and breathable polyurethane film with a relatively uniform thickness and distribution. Compared with the flat roller without patterns, the diamond pattern can avoid the local accumulation of glue on the roller surface, ensuring that the entire film surface can be evenly coated with glue; the edges and corners of the diamond pattern can also divide and guide the glue. During the glue transfer process, these edges and corners can divide the glue into smaller parts, making it easier to spread on the waterproof and breathable polyurethane film. This uniform glue coating is crucial to the quality of the composite fabric, because the uniform glue distribution can ensure that the waterproof and breathable polyurethane film and the back of the fabric can be firmly attached in all parts, avoiding the phenomenon of local degumming. The circular patterns make the glue flow more smoothly on the surface of the engraving roller. Because the circle has no sharp edges, the flow resistance of the glue on the roller surface is relatively small, which helps the glue to quickly fill the patterns on the roller surface.

[0048] After corona treatment, the back of the fabric is relatively rough and has a larger specific surface area. Under the condition of the same amount of glue, the depth of the fabric to be penetrated is shallower than that of the fabric without corona treatment, which further reduces the risk of glue penetration of the fabric. Since the surface of the fabric has not been treated with water, its surface tension is large, which is easy to combine with the glue and improve the adhesion of the fabric. In addition, since the back of the fabric after corona treatment has free radicals, it can make the fabric and the glue better bonded together through chemical bonds, improving adhesion and moisture permeability. Therefore, in order to reduce the risk of glue penetration, the coating gap and lamination gap of the present invention can be relatively small under conventional processes, with a coating gap of -0.10mm to -0.15mm, a lamination gap of -0.15mm to -0.18mm, a glue dispensing amount of 6g / y-8g / y, and a speed of 10m / min-12m / min.

[0049] In summary, the present invention mainly transforms the water-splashing equipment so that the back of the fabric does not contain water-splashing agent, so that the back of the fabric maintains the original surface tension, improves the adhesion between the fabric and the PUR hot melt adhesive, and then calenders the fabric, and then uses corona treatment to improve the roughness and specific surface area of ​​the fabric surface, and improves the adhesion and washability of the fabric while increasing the amount of glue dispensed. In this way, the adhesion of the fabric is guaranteed, and when compounding, the risk of glue penetration of the fabric is controlled by reducing the depth of the glue penetrating into the fabric.

[0050] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A process for producing a waterproof and breathable fabric, characterized in that: The following steps are involved: Fabric: Choose low denier fabric; Desizing: Desizing the low-denier fabric after joining through the desizing tank; Dyeing: dye the desized fabric; Washing and drying: wash and dry the dyed cloth; Mid-term inspection: inspect the quality of dyed fabrics; Spraying and shaping: The additives are loaded into the spraying equipment, which has 20-24 spray holes. The spray holes are at a 90° angle to the running direction of the fabric and parallel to the weft direction of the fabric. During operation, all the spray holes spray the front side of the fabric in a fan-shaped manner, so that the additives are completely covered on the front side of the fabric, and the back side of the fabric is not covered with additives; the spraying amount of the spraying equipment is controlled at 30g / m 2 -35g / m 2 , so that the additives penetrate 1 / 3-1 / 2 of the fabric thickness without reaching the reverse side of the fabric; Calendering: Calender the reverse side of the fabric; Surface corona treatment: The reverse side of the fabric is treated with corona discharge to break the molecular chemical bonds of the fabric and introduce free radicals and hydrophilic groups into the surface of the fabric; Composite: The waterproof and breathable polyurethane film is composited with the back of the fabric through PUR hot melt adhesive.

2. The process for producing a waterproof and breathable fabric according to claim 1, characterized in that: In the fabric joining process, the fabric selected is nylon fabric with a denier number of 15D-20D and a yarn form of DTY.

3. The process for producing a waterproof and breathable fabric according to claim 1, characterized in that: During the water-spraying and shaping process, the vertical distance between the spray hole of the spraying equipment and the fabric is controlled at 1.5cm-2cm.

4. The process for manufacturing a waterproof and breathable fabric according to claim 1, characterized in that: In the water-spraying and shaping process, the spraying equipment is also connected to the spray control panel to control the amount of additives by adjusting the spray flow rate.

5. The process for manufacturing a waterproof and breathable fabric according to claim 1, characterized in that: In the water-splashing setting process, the formula of the auxiliary agents is penetrant 0.5-1g / l, water-splashing agent 40-60g / l, bridging agent 2-3g / l, softener 4-8g / l, accelerator 0.5-1g / l, and the setting conditions are 160℃*40m / min*width*3% overfeed.

6. The process for manufacturing a waterproof and breathable fabric according to claim 1, characterized in that: In the calendering process, the calendering conditions are (140°C-150°C)*30m / min*150n / mm*1 time.

7. The process for manufacturing a waterproof and breathable fabric according to claim 1, characterized in that: In the surface treatment corona process, the electrode gap of the corona treater is 1mm-1.25mm, the corona current is 4A-5A, and the voltage is controlled at 6000V-6500V.

8. The process for manufacturing a waterproof and breathable fabric according to claim 1, characterized in that: In the laminating process, the PUR hot melt adhesive is placed on the engraving roller, and the PUR is transferred to the waterproof and breathable polyurethane film through the rotation of the engraving roller.

9. A process for producing a waterproof and breathable fabric as claimed in claim 8, characterized in that: The engraving roller has diamond or circular patterns, a hole diameter of 0.30 mm to 0.32 mm, a hole depth of 0.03 mm to 0.035 mm, and a mesh number of 100 to 120 meshes.

10. The process for manufacturing a waterproof and breathable fabric according to claim 1, characterized in that: In the composite process, the coating gap is -0.10mm to -0.15mm, the lamination gap is -0.15mm to -0.18mm, the dispensing amount is 6g / y-8g / y, and the speed is 10m / min-12m / min.

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