Novel heat sealing process of PE woven cloth

Abstract

According to the novel heat sealing technology of the PE woven cloth, in the tarpaulin splicing process, macromolecular PE rubber strips are added to heat sealing seams to seal the heat sealing seams, so that cracking and water seepage of the tarpaulin at the heat sealing seams are prevented, the macromolecular PE rubber strips are made of polyethylene, the density of the macromolecular PE rubber strips is 0.91-0.94 g / cm, the melting point of the macromolecular PE rubber strips is 105-135 DEG C, and the macromolecular PE rubber strips have good water resistance and cohesiveness; the width of the heat seal seam is 20 mm to 50 mm, and the width of the macromolecule PE adhesive tape is 10 mm to 20 mm smaller than the width of the heat seal seam.

Description

Technical Field

[0001] This invention relates to the field of tarpaulin processing technology, specifically a novel heat-sealing process for PE woven fabric. Background Technology

[0002] In the manufacturing process of tarpaulins, splicing is an essential step. Traditional tarpaulin splicing methods mainly employ two methods: sewing and heat sealing. While sewing is simple to operate, the needle holes left after sewing can easily lead to water seepage into the tarpaulin. Furthermore, over long-term use, the threads can loosen, causing the tarpaulin to crack and affecting its lifespan. Heat sealing, on the other hand, uses high temperatures to melt and press the edges of the tarpaulin together, offering advantages such as no needle holes and good waterproof performance. However, existing heat sealing processes still have some problems in practical applications: stress concentration can easily occur at the heat-sealed seams, causing the tarpaulin to crack at these seams, especially under frequent stretching and folding. Although the waterproof performance of heat-sealed seams is superior to that of sewing, water seepage may still occur under long-term use and harsh environments, affecting the overall performance and lifespan of the tarpaulin. Summary of the Invention

[0003] The purpose of this invention is to provide a novel heat-sealing process for PE woven fabrics to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A novel heat-sealing process for PE woven fabric involves adding a high-polymer PE adhesive strip to the heat-sealing seam during tarpaulin splicing to seal it, thereby preventing cracking and water seepage at the seam. The high-polymer PE adhesive strip is made of polyethylene with a density of 0.91 g / cm³ to 0.94 g / cm³ and a melting point of 105℃ to 135℃, exhibiting good water resistance and adhesion. The width of the heat-sealing seam is 20 mm to 50 mm, and the width of the high-polymer PE adhesive strip is 10 mm to 20 mm smaller than the width of the heat-sealing seam.

[0005] As a further aspect of the present invention: the polymer PE adhesive strip needs to be pretreated before being added. The pretreatment includes cleaning, drying and surface activation. The cleaning is performed by wiping with anhydrous ethanol or acetone. The drying is carried out at a temperature of 50℃~80℃ for 2h~4h. The surface activation is performed by corona treatment or plasma treatment. The surface tension of the treated adhesive strip is greater than 40mN / m to enhance its bonding effect with the tarpaulin.

[0006] As a further aspect of the present invention: the heat sealing equipment includes a heat sealing machine and a pressure roller. The heating temperature of the heat sealing machine is 150℃~200℃, the heating time is 5s~10s, the pressure of the pressure roller is 0.5MPa~1MPa, the pressing speed is 1m / min~3m / min, and the surface hardness of the pressure roller is Shore A60~70, so as to ensure that the tarpaulin is flat and firmly bonded after heat sealing.

[0007] As a further aspect of the present invention: the tarpaulin is made of one or more of polyester fiber, polypropylene fiber or polyethylene fiber, the thickness of the tarpaulin is 0.3mm to 0.6mm, the warp and weft density is 6 threads / cm to 20 threads / cm, the surface of the tarpaulin is treated with a water-repellent agent, the treatment agent is an organosilicon waterproofing agent, and the waterproofing effect reaches a static water pressure of more than 3000mm, so as to enhance the waterproof performance of the tarpaulin.

[0008] As a further aspect of the present invention: the polymer PE adhesive strip and the tarpaulin are sealed through a combination of hot melt bonding and mechanical interlocking. The hot melt bonding area accounts for 60% to 80% of the total contact area, and the mechanical interlocking depth is 0.1 mm to 0.3 mm. By controlling the heat sealing temperature and pressure, the adhesive strip partially melts and penetrates into the gaps between the tarpaulin fibers to form a strong interlocking structure.

[0009] As a further aspect of the present invention: the heat sealing process also includes a quality inspection step, the inspection contents of which include heat sealing strength, waterproof performance and appearance quality. The heat sealing strength is tested using a tensile testing machine with a tensile speed of 100 mm / min, and the qualified standard is a tensile force of not less than 500 N / 5 cm; the waterproof performance is tested using a hydrostatic pressure tester, and the qualified standard is a hydrostatic pressure of not less than 3000 mm; the appearance quality inspection includes the flatness, continuity and uniformity of the heat-sealed seam and the adhesive strip, requiring no obvious bumps, breaks and bubbles.

[0010] As a further aspect of the present invention: the heat-sealing process is applicable to the splicing of tarpaulins of various specifications and materials, including but not limited to tent tarpaulins, sunshade tarpaulins, waterproof tarpaulins, and advertising tarpaulins. The heat-sealing parameters for different application scenarios can be appropriately adjusted according to the specific characteristics and usage requirements of the tarpaulin. The adjustment range is temperature ±20℃, pressure ±0.2MPa, and speed ±1m / min, to ensure the consistency of heat-sealing quality and product performance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0012] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0013] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Example

[0014] In this embodiment, a novel heat-sealing process for PE woven fabric is described, with the following specific steps: Materials preparation: Choose a polyester fiber tarpaulin with a thickness of 0.4mm and a warp and weft density of 6-20 threads / cm. Its surface is treated with a water-repellent finish, achieving a hydrostatic pressure resistance of 3500mm. Use high-molecular PE adhesive strips with a density of 0.92g / cm³ and a melting point of 120℃, with a strip width of 20mm-50mm.

[0015] Equipment debugging: The heating temperature of the heat sealing machine was set to 180℃, the heating time to 8s, the pressure of the pressure roller to 0.8MPa, the pressing speed to 2m / min, and the surface hardness of the pressure roller to Shore A65.

[0016] Preparation of heat-sealed joints: Align the edges of the two tarpaulins to form a 50mm wide heat-sealed seam, which is straight in shape.

[0017] Pretreatment of adhesive strips: The polymer PE strip was wiped clean with anhydrous ethanol, then dried at 60°C for 3 hours, and then surface activated by corona treatment to achieve a surface tension of 42 mN / m.

[0018] Adding adhesive strips: The treated polymer PE adhesive strips achieve sealing through a combination of hot melt bonding and mechanical interlocking. The hot melt bonding area accounts for 60% to 80% of the total contact area, and the mechanical interlocking depth is 0.1 mm to 0.3 mm. By controlling the heat sealing temperature and pressure, the adhesive strips partially melt and penetrate into the gaps between the tarpaulin fibers to form a strong interlocking structure.

[0019] Heat sealing operation: Start the heat sealing machine to heat seal the seam with the adhesive strip. During the heat sealing process, the heating plate of the heat sealing machine heats the tarpaulin and adhesive strip, causing the adhesive strip to melt and bond with the tarpaulin. At the same time, the pressure roller flattens the heat-sealed tarpaulin to ensure that the tarpaulin is flat and firmly bonded.

[0020] Quality Inspection: The heat-sealed tarpaulin underwent quality testing. The heat-sealing strength was tested using a tensile testing machine at a tensile speed of 100 mm / min, and the test result showed a tensile strength of 550 N / 5 cm, which meets the qualified standard. The waterproof performance was tested using a hydrostatic pressure tester, and the test result showed a hydrostatic pressure of 3200 mm, which meets the qualified standard. The appearance quality inspection showed that the heat-sealed seam was flat and continuous, the adhesive strip was uniform, and there were no obvious bumps, breaks, or bubbles. Example

[0021] In this embodiment, a novel heat-sealing process for PE woven fabric is described, with the following specific steps: Materials preparation: The selected tarpaulin is made of 0.5mm thick polypropylene fiber with a warp and weft density of 6-20 threads / cm. Its surface is treated with a water-repellent finish, achieving a hydrostatic pressure resistance of 3800mm. High-molecular-weight PE adhesive strips with a density of 0.93g / cm³ and a melting point of 125℃ are used. The strips are 4mm wide and 2mm thick.

[0022] Equipment debugging: The heating temperature of the heat sealing machine was set to 190℃, the heating time to 7s, the pressure of the pressure roller to 0.7MPa, the pressing speed to 2.5m / min, and the surface hardness of the pressure roller to Shore A68.

[0023] Preparation of heat-sealed joints: Align the edges of the two tarpaulins to form a 4mm wide heat-sealed seam, which is straight in shape.

[0024] Pretreatment of adhesive strips: The polymer PE adhesive strip was wiped clean with acetone, then dried at 70°C for 2 hours, and then surface activated by plasma treatment to achieve a surface tension of 45 mN / m.

[0025] Adding adhesive strips: The treated polymer PE adhesive strips achieve sealing through a combination of hot melt bonding and mechanical interlocking. The hot melt bonding area accounts for 60% to 80% of the total contact area, and the mechanical interlocking depth is 0.1 mm to 0.3 mm. By controlling the heat sealing temperature and pressure, the adhesive strips partially melt and penetrate into the gaps between the tarpaulin fibers to form a strong interlocking structure.

[0026] Heat sealing operation: Start the heat sealing machine to heat seal the seam with the adhesive strip. During the heat sealing process, the heating plate of the heat sealing machine heats the tarpaulin and adhesive strip, causing the adhesive strip to melt and bond with the tarpaulin. At the same time, the pressure roller flattens the heat-sealed tarpaulin to ensure that the tarpaulin is flat and firmly bonded.

[0027] Quality Inspection: The heat-sealed tarpaulin underwent quality testing. The heat-sealing strength was tested using a tensile testing machine at a tensile speed of 100 mm / min, and the test result showed a tensile strength of 600 N / 5 cm, which meets the qualified standard. The waterproof performance was tested using a hydrostatic pressure tester, and the test result showed a hydrostatic pressure of 3500 mm, which meets the qualified standard. The appearance quality inspection showed that the heat-sealed seam was flat and continuous, the adhesive strip was uniform, and there were no obvious bumps, breaks, or bubbles. Example

[0028] In this embodiment, a novel heat-sealing process for PE woven fabric is described, with the following specific steps: Materials preparation: Choose a polyethylene fiber tarpaulin with a thickness of 0.6mm and a warp and weft density of 6-20 threads / cm. Its surface is treated with a water-repellent finish, achieving a hydrostatic pressure resistance of 4000mm. Use high-molecular-weight PE adhesive strips with a density of 0.94g / cm³, a melting point of 130℃, a strip width of 5mm, and a thickness of 2.5mm.

[0029] Equipment debugging: The heating temperature of the heat sealing machine was set to 200℃, the heating time to 6s, the pressure of the pressure roller to 0.6MPa, the pressing speed to 3m / min, and the surface hardness of the pressure roller to Shore A70.

[0030] Preparation of heat-sealed joints: Align the edges of the two tarpaulins to form a 50mm wide seam with a wavy shape.

[0031] Pretreatment of adhesive strips: The polymer PE strip was wiped clean with anhydrous ethanol, then dried at 80°C for 1.5 hours, and then surface activated by corona treatment to achieve a surface tension of 48 mN / m.

[0032] Adding adhesive strips: The treated polymer PE adhesive strips achieve sealing through a combination of hot melt bonding and mechanical interlocking. The hot melt bonding area accounts for 60% to 80% of the total contact area, and the mechanical interlocking depth is 0.1 mm to 0.3 mm. By controlling the heat sealing temperature and pressure, the adhesive strips partially melt and penetrate into the gaps between the tarpaulin fibers to form a strong interlocking structure.

[0033] Heat sealing operation: Start the heat sealing machine to heat seal the seam with the adhesive strip. During the heat sealing process, the heating plate of the heat sealing machine heats the tarpaulin and adhesive strip, causing the adhesive strip to melt and bond with the tarpaulin. At the same time, the pressure roller flattens the heat-sealed tarpaulin to ensure that the tarpaulin is flat and firmly bonded.

[0034] Quality Inspection: The heat-sealed tarpaulin underwent quality testing. The heat-sealing strength was tested using a tensile testing machine at a tensile speed of 100 mm / min, and the test result showed a tensile strength of 650 N / 5 cm, which meets the qualified standard. The waterproof performance was tested using a hydrostatic pressure tester, and the test result showed a hydrostatic pressure of 4200 mm, which meets the qualified standard. The appearance quality inspection showed that the heat-sealed seam was flat and continuous, the adhesive strip was uniform, and there were no obvious bumps, breaks, or bubbles.

[0035] As can be seen from the above embodiments, the novel heat-sealing process for the PE woven fabric of the present invention can effectively prevent the tarpaulin from cracking and leaking at the heat-sealed seams, thereby improving the service life and waterproof performance of the tarpaulin. In practical applications, the parameters of the heat-sealing process can be appropriately adjusted according to different tarpaulin materials and usage requirements to achieve the best heat-sealing effect.

Claims

1. A novel heat-sealing process for PE woven fabric, characterized in that: During the tarpaulin splicing process, high-polymer PE adhesive strips are added to the heat-sealed joints to seal them, thereby preventing the tarpaulin from cracking and leaking water at the heat-sealed joints. The high-polymer PE adhesive strips are made of polyethylene with a density of 0.91g / cm³ to 0.94g / cm³ and a melting point of 105℃ to 135℃. They have good water resistance and adhesion. The width of the heat-sealed joint is 20mm to 50mm, and the width of the high-polymer PE adhesive strips is 10mm to 20mm smaller than the width of the heat-sealed joint.

2. The novel heat-sealing process for PE woven fabric according to claim 1, characterized in that: The polymer PE adhesive strip needs to be pretreated before being added. The pretreatment includes cleaning, drying and surface activation. Cleaning is done by wiping with anhydrous ethanol or acetone. Drying is carried out at a temperature of 50℃~80℃ for 2h~4h. Surface activation is done by corona treatment or plasma treatment. The surface tension of the treated adhesive strip is greater than 40mN / m to enhance its bonding effect with the tarpaulin.

3. The novel heat-sealing process for PE woven fabric according to claim 1, characterized in that: The heat sealing equipment includes a heat sealing machine and a pressure roller. The heating temperature of the heat sealing machine is 150℃~200℃, the heating time is 5s~10s, the pressure of the pressure roller is 0.5MPa~1MPa, the pressing speed is 1m / min~3m / min, and the surface hardness of the pressure roller is Shore A60~70, to ensure that the tarpaulin is flat and firmly bonded after heat sealing.

4. The novel heat-sealing process for PE woven fabric according to claim 1, characterized in that: The tarpaulin is made of one or more of polyester fiber, polypropylene fiber, or polyethylene fiber. The thickness of the tarpaulin is 0.3mm to 0.6mm, and the warp and weft density is 6 threads / cm to 20 threads / cm. The surface of the tarpaulin is treated with a water-repellent agent, which is an organosilicon waterproofing agent. The waterproofing effect reaches a static water pressure of over 3000mm to enhance the waterproof performance of the tarpaulin.

5. The novel heat-sealing process for PE woven fabric according to claim 1, characterized in that: The high-polymer PE adhesive strip achieves sealing between the tarpaulin and the tarpaulin through a combination of hot-melt bonding and mechanical interlocking. The hot-melt bonding area accounts for 60% to 80% of the total contact area, and the mechanical interlocking depth is 0.1 mm to 0.3 mm. By controlling the heat sealing temperature and pressure, the adhesive strip partially melts and penetrates into the gaps between the tarpaulin fibers to form a strong interlocking structure.

6. The novel heat-sealing process for PE woven fabric according to claim 1, characterized in that: The heat sealing process also includes a quality inspection step, which includes heat sealing strength, waterproof performance, and appearance quality. Heat sealing strength is tested using a tensile testing machine at a tensile speed of 100 mm / min, and the passing standard is a tensile force of not less than 500 N / 5 cm. Waterproof performance is tested using a hydrostatic pressure tester, and the passing standard is a hydrostatic pressure of not less than 3000 mm. Appearance quality inspection includes the flatness, continuity, and uniformity of the heat-sealed seam and the adhesive strip, requiring no obvious bumps, breaks, or bubbles.

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