Application of antibacterial cool material in production of backpack

Abstract

The application relates to the technical field of backpack production, and aims to provide an application of an antibacterial cool material in backpack production, which comprises the following steps: processing the antibacterial cool material into a sheet-shaped cutting piece, laminating the sheet-shaped cutting piece and a base material of a backpack back pad into an integrated whole through a hot-pressing composite process to form a contact layer of the backpack back pad; the temperature of the hot-pressing composite is 120 DEG C to 160 DEG C, the pressure is 0.3 MPa to 0.8 MPa, and the pressure maintaining time is 30 s to 90 s. The method further comprises processing the antibacterial cool material into a belt-shaped cutting piece wrapped outside a backpack shoulder strap and processing the antibacterial cool material into a pasting cutting piece attached to the surface of a backpack waist pad. Through the synergistic effect of the hot-pressing composite, plasma treatment, ultrasonic edge sealing and segmented hot-pressing processes, the antibacterial cool material is firmly combined with each component of the backpack and effectively functions, and the prepared backpack product has a contact cool coefficient qmax of 0.15 to 0.22 J / (cm2.s) according to the CNS 15687 standard test, and has persistent cool comfort and antibacterial and sanitary performances.

Description

Technical Field

[0001] This invention relates to the field of backpack manufacturing technology, and in particular to the application of an antibacterial cooling material in backpack manufacturing. Background Technology

[0002] Backpacks, as widely used carrying tools in daily life, are in constant contact with the back, shoulders, and other parts of the body. When using a backpack in summer or during sports activities, the lack of breathability between the back and the backpack padding causes heat buildup and sweat secretion, resulting not only in a stuffy and uncomfortable feeling but also in a warm, humid environment that easily breeds bacteria and causes skin problems. Therefore, developing backpack products that combine cooling and antibacterial functions is of significant practical importance.

[0003] In recent years, the field of functional textile materials has developed rapidly. Chinese invention patent CN104790112A discloses a cooling and antibacterial functional knitted fabric, which uses a blend of moisture-wicking polyester cooling fibers, polyester antibacterial fibers, and cotton Sirospun fibers to form yarn, woven into a single-sided plain weave using a computerized flat knitting machine, possessing both cooling and antibacterial functions. However, this patent only relates to the weaving method of the fabric and does not cover the specific application methods and processing techniques of this fabric in backpack products.

[0004] Chinese utility model patent CN221437413U discloses a graphene antibacterial and cooling fabric. It achieves heat dissipation and antibacterial effects by setting a first cooling and antibacterial layer formed by a blend of mica fiber and nylon graphene fiber on both sides of the base fabric layer, and a second cooling and antibacterial layer formed by a blend of bamboo charcoal fiber and polyester fiber. However, this patent also remains at the fabric structure level and fails to solve the technological problem of how to effectively integrate functional materials into various components of the backpack.

[0005] Chinese utility model patent CN223672008U discloses a cooling and antibacterial spunlace nonwoven fabric, which includes an adhesively bonded water-repellent nonwoven layer and a spunlace composite nonwoven layer. The spunlace composite nonwoven layer comprises a cooling fiber layer, a mosquito-repellent fiber layer, a mesh fabric, and a bamboo fiber layer. Although this nonwoven fabric has a cooling sensation and antibacterial effect, it does not describe specific application methods in backpack products.

[0006] Chinese invention patent application CN202422730991.0 discloses an antibacterial cooling material that has good antibacterial properties and a cooling effect upon contact, but it does not involve a specific method for applying the material to backpack products.

[0007] In summary, while various materials and fabrics with antibacterial and cooling properties exist in the current technology, none address a complete process for effectively applying these functional materials in backpack production. Simply sewing or pasting antibacterial and cooling materials onto the backpack surface not only results in insufficient bonding strength and poor durability, but also makes it difficult to ensure a good match between the functional materials and the backpack's ergonomic structure. Furthermore, it fails to achieve interfacial compatibility and long-term stability between the functional materials and the backpack's base material. Therefore, how to apply antibacterial and cooling materials to key components such as back pads, shoulder straps, and lumbar supports in a standardized and industrialized manner is a pressing technical problem that needs to be solved in this field. Summary of the Invention

[0008] The purpose of this invention is to provide an application of an antibacterial cooling material in backpack production, so as to solve the above-mentioned technical defects in the prior art.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] The application of an antibacterial cooling material in backpack production includes the following steps:

[0011] S1: Process the antibacterial cooling material into sheet-like pieces;

[0012] S2: The sheet-like cut pieces are combined with the base material layer on the back pad or shoulder strap of the backpack and the side in contact with the human body through a hot-pressing composite process to form a backpack contact layer.

[0013] The hot-pressing composite process is carried out at a temperature of 120℃ to 160℃, a pressure of 0.3MPa to 0.8MPa, and a holding time of 30s to 90s.

[0014] Preferably, the sheet-like cut piece is obtained by die-cutting the antibacterial cooling material roll according to the contour shape of the side of the backpack pad or shoulder strap that contacts the human body, with the cutting temperature controlled at 40℃~60℃ and the cutting speed controlled at 5m / min~15m / min.

[0015] Preferably, before hot pressing, the sheet-like cut piece and the matrix material are preheated at a temperature of 80°C to 100°C for a time of 10 to 30 seconds; after hot pressing, they are cooled to room temperature at a rate of 5°C to 15°C per minute.

[0016] Preferably, the material of the back pad or shoulder strap of the backpack that comes into contact with the human body is selected from at least one of EVA foam, polyurethane foam or polyethylene foam, and the thickness of the base material is 5mm to 20mm.

[0017] Preferably, the method further includes processing the antibacterial cooling material into a strip, wrapping the strip around the core material of the backpack shoulder strap, and fixing it by sewing or high-frequency welding to form the contact layer of the shoulder strap; the width of the strip is 30mm to 80mm and the thickness is 0.5mm to 2mm.

[0018] Preferably, the method further includes processing the antibacterial cooling material into a bonding piece, and attaching the bonding piece to the surface of the backpack waist pad using a hot melt adhesive film bonding process, with a bonding temperature of 110℃~150℃ and a bonding pressure of 0.2MPa~0.5MPa.

[0019] Preferably, before processing the antibacterial cooling material into cut pieces, the antibacterial cooling material is subjected to plasma surface treatment with a treatment power of 200W to 500W, a treatment time of 30s to 120s, and a treatment atmosphere of nitrogen or argon.

[0020] Preferably, after the antibacterial cooling material is processed into cut pieces, the edges of the cut pieces are ultrasonically sealed with a sealing frequency of 20kHz to 40kHz and a sealing width of 2mm to 5mm.

[0021] Preferably, the hot-pressing composite process adopts a segmented hot-pressing method, which includes a first hot-pressing section and a second hot-pressing section in sequence;

[0022] The temperature of the first hot-pressing section is 120℃~140℃, the pressure is 0.3MPa~0.5MPa, and the time is 20s~40s;

[0023] The temperature of the second hot-pressing section is 140℃~160℃, the pressure is 0.5MPa~0.8MPa, and the time is 20s~50s.

[0024] Preferably, the method further includes a step of perforating the antibacterial cooling material, wherein the perforation process forms through holes with a diameter of 0.5 mm to 2 mm on the sheet or strip cut piece, the opening rate of the through holes is 10% to 30%, and the perforation method is mechanical punching or laser punching.

[0025] As an improvement, the beneficial effects of the present invention are as follows:

[0026] 1. By using a hot-pressing composite process to integrate the antibacterial cooling material with the backpack padding base material, a strong bond between the functional material and the backpack structural components is achieved. This avoids problems such as detachment and displacement caused by simple stitching or gluing, and significantly improves the product's durability and service life.

[0027] 2. By precisely controlling the temperature, pressure, and time parameters of hot-pressing composite, the bonding strength of the composite interface is ensured, while thermal damage to the functional properties of the antibacterial and cooling materials is avoided, thus ensuring the long-term effectiveness of the cooling and antibacterial functions.

[0028] 3. Antibacterial and cooling materials are applied to key parts of the backpack that come into direct contact with the human body, such as the back pad, shoulder straps, and waist pad, achieving comprehensive functional coverage of the human body contact surface and significantly improving the user's comfort experience.

[0029] 4. Through the synergistic effect of processes such as plasma surface treatment, ultrasonic edge sealing, and segmented hot pressing, the processing performance of materials and the overall quality of products have been further optimized. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described below. It should be noted that the terms "front", "rear", "left", "right", "up" and "down" used in the following description refer to the direction of the center, and the terms "inner" and "outer" refer to the direction toward or away from the geometric center of a specific component, respectively.

[0031] To make the content of this invention easier to understand, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention.

[0032] Example 1

[0033] This embodiment provides a method for applying antibacterial cooling materials in the production of backpack back pads.

[0034] The rolled antibacterial cooling material is placed on the unwinding rack of a die-cutting machine. This antibacterial cooling material is a layered composite material. The outer layer, which comes into contact with the body, is a blend of polyethylene fiber (i.e., ethylene) and polyester fiber, with polyethylene fiber comprising 55%–80% of the mass and polyester fiber 20%–45% by mass. The bottom layer is made of polyester fiber. Polyethylene fiber has a high thermal conductivity, providing a cooling sensation upon contact, while polyester fiber imparts good mechanical strength and dimensional stability. Die-cutting cutters are designed according to the contour of the backpack pad, and are formed using laser cutting. The die-cutting machine is started, with the cutting temperature set to 50℃ and the cutting speed set to 10m / min, continuously die-cutting the antibacterial cooling material roll to obtain sheet-like pieces conforming to the contour of the backpack pad. After cutting, the edges of the sheet-like pieces are ultrasonically sealed. The ultrasonic sealing machine frequency is set to 30kHz, and the sealing width is set to 3mm to prevent the fibers at the edges of the sheet from loosening or fraying.

[0035] A 12mm thick EVA foam material was used as the base material for the backpack back pad, and pre-cut into the corresponding shape according to the outline of the backpack back pad. The sheet cut and the EVA foam base material were simultaneously fed into an infrared preheating device, with the preheating temperature set to 90℃ and the preheating time set to 20s.

[0036] After preheating, the sheet-shaped cut pieces are immediately stacked on the surface of the EVA foam matrix material and fed into a hot press laminating machine. The hot press lamination adopts a segmented hot press method: the temperature of the first hot press segment is set to 130℃, the pressure to 0.4MPa, and the holding time to 30s; the temperature of the second hot press segment is set to 150℃, the pressure to 0.6MPa, and the holding time to 35s. After the segmented hot press is completed, the composite is cooled to room temperature at a cooling rate of 10℃ / min to obtain the finished backpack pad with an antibacterial cooling contact layer.

[0037] Testing revealed that the backpack padding produced in this embodiment exhibited a peel strength of 4.2 N / cm between the contact layer and the substrate material, significantly higher than that achieved by ordinary adhesive bonding methods (typically below 1.5 N / cm). After 50 simulated wear tests, the contact layer surface showed no blistering, peeling, or cracking, and the functional layer of the antibacterial cooling material remained intact. Testing according to CNS 15687 standard (Test Method for Instant Cooling Performance of Fabrics) showed a contact cooling coefficient qmax of 0.18–0.22 J / (cm²·s), with an average value of approximately 0.20 J / (cm²·s), indicating a significant instant cooling effect. Testing according to GB / T 20944.3-2008 "Evaluation of Antibacterial Properties of Textiles Part 3: Oscillation Method" showed an inhibition rate of ≥95% against Staphylococcus aureus, ≥92% against Escherichia coli, and ≥90% against Candida albicans.

[0038] Example 2

[0039] This embodiment provides a method for applying antibacterial cooling materials in the production of backpack shoulder straps.

[0040] The antibacterial cooling material roll was placed on a slitting machine. The surface layer of the antibacterial cooling material contains a blend of polyethylene fiber and polyester fiber, with the polyethylene fiber accounting for 55%–80% of the mass. The slitting machine was set to a cutting temperature of 45℃ and a cutting speed of 8m / min to slit the roll into strips 50mm wide and 1.2mm thick. After cutting, the long sides of the strips were ultrasonically sealed. The ultrasonic sealing machine was set to a frequency of 35kHz and a sealing width of 2.5mm.

[0041] After edge sealing, a laser punching machine is used to punch holes in the strip cut piece. The power of the laser punching machine is set to 30W, the punching speed is set to 500 holes / min, and through holes with a diameter of 1.0mm are formed on the strip cut piece. The through holes are arranged in a matrix with a hole spacing of 3mm and an opening rate of 20%.

[0042] Take the core material of the backpack shoulder strap. This core material is a long strip made of polyurethane foam, 40mm wide and 15mm thick. Wrap the strip around the core material, ensuring it completely covers the contact surface with the body and parts of both sides. After wrapping, use a high-frequency welding machine to weld and secure the overlapping parts of the strip. Set the frequency of the welding machine to 27.12MHz, the power to 3kW, and the welding time to 5s. After welding, reinforce the edges of the strip with a double-needle sewing machine using polyester thread and a stitch length of 3mm.

[0043] Testing revealed that the backpack shoulder strap manufactured in this embodiment exhibits a strong bond between the contact layer and the core material, showing no delamination after 500 bending fatigue tests. The contact layer surface of the shoulder strap has regularly distributed breathable pores, achieving an air permeability of 120 mm / s. According to CNS 15687 standard testing, the contact cooling coefficient qmax reaches 0.15–0.20 J / (cm²·s), with an average value of approximately 0.17 J / (cm²·s). According to GB / T 20944.3-2008 testing, the antibacterial rate against Staphylococcus aureus is ≥93%.

[0044] Example 3

[0045] This embodiment provides a method for applying antibacterial cooling materials in the production of backpack waist pads.

[0046] The antibacterial cooling material roll was cut into fitted pieces that matched the shape of the backpack's waist pad using a die-cutting machine. The cutting temperature was set to 55℃, and the cutting speed was set to 12m / min. After cutting, all edges of the fitted pieces were ultrasonically sealed. The ultrasonic sealing machine frequency was set to 25kHz, and the sealing width was set to 4mm.

[0047] Take a 0.10mm thick hot melt adhesive film (TPU hot melt adhesive film, melting point temperature 120℃) and cut it to the same size as the bonding piece. Place the hot melt adhesive film between the bonding piece and the backpack waist pad surface, aligning the three pieces. Place the stacked assembly into a hot press bonding machine. Set the hot press bonding temperature to 130℃, the pressure to 0.35MPa, and the holding time to 45s. After hot press bonding, allow it to cool naturally to room temperature.

[0048] To further improve the breathability and comfort of the lumbar pad, the surface of the bonding piece after bonding is mechanically punched to form through holes with a diameter of 1.5mm and an opening rate of 15%.

[0049] Testing showed that the adhesive strength between the lumbar pad and the fabricated piece of the backpack pad obtained in this embodiment reached 3.8 N / cm. After a 48-hour damp heat aging test (temperature 70℃, relative humidity 95%), the adhesive strength retention rate was ≥85%, with no delamination or wrinkling.

[0050] Example 4

[0051] This embodiment provides a comprehensive application method of antibacterial and cooling materials in backpack production, involving three components: back pad, shoulder straps, and waist pad.

[0052] First, the antibacterial cooling material roll was subjected to plasma surface pretreatment. After unwinding, the roll was continuously fed into the plasma treatment equipment. The treatment power was set to 350W, the treatment time to 60s, the treatment atmosphere to nitrogen, and the gas flow rate to 50L / min. After plasma treatment, the surface wetting tension of the antibacterial cooling material increased from 32mN / m to over 48mN / m, significantly improving the interfacial compatibility between the material and other matrix materials.

[0053] The plasma-treated antibacterial cooling material was processed simultaneously into sheet-like pieces for backpack back pads, strip-like pieces for shoulder straps, and fitted pieces for waist pads, according to the methods described in Examples 1, 2, and 3. During the cutting process, the cutting temperature was uniformly set to 50℃, and the cutting speed was uniformly set to 10m / min.

[0054] The back pad is hot-pressed using a segmented hot-pressing method: the first hot-pressing segment has a temperature of 130℃, a pressure of 0.4MPa, and a time of 30s; the second hot-pressing segment has a temperature of 150℃, a pressure of 0.6MPa, and a time of 35s. After hot-pressing, the pad is cooled at a rate of 10℃ / min.

[0055] After the shoulder strap strip is wrapped around the core material, it is fixed by a combination of high-frequency welding and sewing reinforcement. The high-frequency welding frequency is 27.12MHz, the power is 3kW, and the time is 5s; the sewing stitch length is 3mm.

[0056] The lumbar support pad's fitting pieces are bonded together using hot melt adhesive film. The hot pressing bonding temperature is 130℃, the pressure is 0.35MPa, and the time is 45s.

[0057] The separately processed back pad, shoulder straps, and waist pad are assembled with other backpack components (bag body, zippers, buckles, etc.) to obtain a complete backpack with antibacterial and cooling functions.

[0058] Testing revealed that the contact layers of the backpack's back pad, shoulder straps, and lumbar pad all exhibited excellent antibacterial and cooling properties. The back pad contact layer showed a 96% antibacterial rate against Staphylococcus aureus, the shoulder strap contact layer 94%, and the lumbar pad contact layer 93%. According to CNS 15687 standards, the cooling coefficient (qmax) for the back pad was 0.18–0.22 J / (cm²·s), with an average value of approximately 0.21 J / (cm²·s); for the shoulder straps, it was 0.15–0.20 J / (cm²·s), with an average value of approximately 0.17 J / (cm²·s); and for the lumbar pad, it was 0.15–0.18 J / (cm²·s), with an average value of approximately 0.16 J / (cm²·s). After 50 simulated uses and cleaning tests, the functional retention rate of each part was above 85%. Wash with water at a temperature below 40℃ using regular water. Do not bleach, iron, dry clean, or tumble dry. Hang to dry in a cool, shaded place.

[0059] Example 5

[0060] This embodiment provides a method for applying antibacterial cooling material in the production of backpack back pads, wherein the base material is polyurethane foam.

[0061] The antibacterial cooling material roll was die-cut into sheet-like pieces at a temperature of 40°C and a speed of 6 m / min. An 8 mm thick polyurethane foam was used as the matrix material. The sheet-like pieces and the polyurethane foam matrix material were preheated in a preheating device at 85°C for 15 seconds.

[0062] Hot-pressing composite is performed using a single-stage hot-pressing method: temperature 140℃, pressure 0.5MPa, and holding time 60s. After hot-pressing composite, it is cooled to room temperature at a cooling rate of 8℃ / min.

[0063] Unlike Example 1, in this example, before hot pressing, a layer of polyurethane primer is coated on the back of the sheet (i.e. the side in contact with the substrate material). The amount of primer is controlled at 5g / m² to further improve the interfacial bonding strength between the sheet and the polyurethane foam material.

[0064] Testing revealed that the backpack pad prepared in this embodiment exhibited a peel strength of 5.1 N / cm, higher than the 4.2 N / cm of Example 1. According to CNS 15687 standard testing, the contact cooling coefficient qmax was 0.17–0.21 J / (cm²·s), with an average value of approximately 0.19 J / (cm²·s). The antibacterial rate against Staphylococcus aureus was 95%.

[0065] Example 6

[0066] This embodiment provides a method for applying antibacterial cooling material in the production of backpack back pads, wherein the base material is polyethylene foam.

[0067] The antibacterial cooling material roll was die-cut into sheet-like pieces at a temperature of 60°C and a speed of 14 m / min. 18 mm thick polyethylene foam was used as the matrix material. The sheet-like pieces and the polyethylene foam matrix material were preheated in a preheating device at 95°C for 25 seconds.

[0068] The hot-pressing process employs a segmented hot-pressing method: the first hot-pressing stage has a temperature of 125℃, a pressure of 0.35MPa, and a time of 35s; the second hot-pressing stage has a temperature of 145℃, a pressure of 0.55MPa, and a time of 40s. After hot-pressing, the material is cooled to room temperature at a cooling rate of 12℃ / min.

[0069] Before processing the antibacterial cooling material into cut pieces, the antibacterial cooling material is first subjected to plasma surface treatment with a treatment power of 400W, a treatment time of 80s, and an argon atmosphere.

[0070] The backpack pad prepared in this embodiment has a peel strength of 4.5 N / cm. According to the CNS 15687 standard, the contact cooling coefficient qmax is 0.17-0.21 J / (cm²·s), and the middle value is about 0.19 J / (cm²·s). The antibacterial rate against Staphylococcus aureus is 96%.

[0071] Example 7

[0072] This embodiment provides a method for applying antibacterial cooling material in the production of backpack shoulder straps, wherein the processing parameters of the strip-shaped cut pieces are different from those in Embodiment 2.

[0073] The antibacterial cooling material roll was cut into strips 70mm wide and 1.8mm thick. The cutting temperature was set to 55℃ and the cutting speed to 10m / min. After cutting, the strips were ultrasonically sealed at a frequency of 30kHz and a sealing width of 4mm.

[0074] The holes are punched using a mechanical punching method to form through holes with a diameter of 1.8 mm on the strip cut piece, with an opening rate of 25%.

[0075] EVA foam material with a width of 60mm and a thickness of 20mm was used as the core material for the shoulder straps. After wrapping the strip-shaped piece around the core material, it was secured solely by sewing, without using high-frequency welding. A double-needle sewing machine was used, with a stitch length set to 4mm, and nylon thread was used.

[0076] Testing revealed that the backpack shoulder strap produced in this embodiment exhibited a slightly lower bonding strength between the contact layer and the core material compared to Embodiment Two (high-frequency welding + sewing reinforcement), but still met the requirements for daily use. No delamination was observed after 300 bending fatigue tests. According to CNS 15687 standard testing, the contact cooling coefficient qmax was 0.15–0.18 J / (cm²·s), with an average value of approximately 0.16 J / (cm²·s). The antibacterial rate against Staphylococcus aureus was 92%.

[0077] Example 8

[0078] This embodiment provides a method for applying antibacterial cooling material in the production of backpack waist pads, wherein different bonding process parameters are used.

[0079] Cut the antibacterial cooling material roll into bonding pieces, setting the cutting temperature to 50℃ and the cutting speed to 10m / min. Take a 0.12mm thick hot melt adhesive film (EVA hot melt adhesive film, melting point temperature 110℃) and cut it to the same size as the bonding pieces.

[0080] The hot-press bonding temperature was set to 145℃, the pressure to 0.45MPa, and the holding time to 50s. After hot-press bonding was completed, the material was rapidly cooled at a rate of 15℃ / min.

[0081] After bonding, a through hole with a diameter of 1.2mm is formed on the surface of the bonded piece by laser drilling, with an opening rate of 12%.

[0082] The backpack waist pad prepared in this embodiment was tested and found to have an adhesive strength of 4.0 N / cm. After a 48-hour damp heat aging test, the adhesive strength retention rate was ≥82%.

[0083] Example 9

[0084] This embodiment provides a method for applying antibacterial cooling materials in backpack production, focusing on the impact of plasma pretreatment on the processing effect of different components.

[0085] The antibacterial cooling material rolls were divided into three groups: the first group was not subjected to plasma treatment, the second group was subjected to plasma treatment (300W power, 50s time, nitrogen atmosphere), and the third group was subjected to plasma treatment (450W power, 100s time, argon atmosphere). The three groups of materials were processed into back pads, shoulder straps, and lumbar pads according to the method in Example 4, and the corresponding composite or bonding processes were completed.

[0086] Comparative test results showed that the average peel strength between the untreated material (Group 1) and the substrate was 3.2 N / cm; after nitrogen plasma treatment (Group 2), the peel strength increased to 4.5 N / cm; and after argon plasma treatment (Group 3), the peel strength increased to 4.8 N / cm. Meanwhile, plasma treatment had no significant negative impact on the antibacterial and cooling properties of the antibacterial cooling materials. The antibacterial rate of all three groups was between 92% and 96%, and the contact cooling coefficient qmax tested according to CNS 15687 standard was between 0.15 and 0.22 J / (cm²·s).

[0087] Example 10

[0088] This embodiment provides a method for applying antibacterial cooling material in the production of backpack pads, and compares the effects of different perforation parameters on breathability.

[0089] The antibacterial cooling material roll was cut into four sheets, and each sheet was perforated with different parameters: the first sheet was not perforated; the second sheet had a hole diameter of 0.8 mm and an open area ratio of 15%; the third sheet had a hole diameter of 1.5 mm and an open area ratio of 20%; and the fourth sheet had a hole diameter of 2.0 mm and an open area ratio of 30%. All four sheets were hot-pressed onto the EVA foam matrix material according to the method in Example 1.

[0090] The breathability test results show that the breathability of the first group (without perforations) is 45 mm / s; the second group is 95 mm / s; the third group is 135 mm / s; and the fourth group is 165 mm / s. The contact cooling coefficient test results according to CNS 15687 standard show that the qmax of the first group is 0.18–0.22 J / (cm²·s), with an average value of approximately 0.20 J / (cm²·s); the second group is 0.17–0.21 J / (cm²·s), with an average value of approximately 0.19 J / (cm²·s); the third group is 0.16–0.20 J / (cm²·s), with an average value of approximately 0.18 J / (cm²·s); and the fourth group is 0.15–0.19 J / (cm²·s), with an average value of approximately 0.17 J / (cm²·s). The antibacterial rate test results showed that all four groups were between 93% and 96%, with no significant difference.

[0091] Considering breathability, cooling performance, and processing feasibility, the preferred perforation parameter range is 1.0mm to 1.5mm in pore size and 15% to 25% in porosity.

[0092] Summary of performance test results for each embodiment

[0093] To further illustrate the performance of the backpack products obtained in the various embodiments of the present invention, the test results of the above embodiments are summarized in Table 1.

[0094] Table 1 Performance test results of backpack components prepared in each embodiment

[0095] 1 Back pad Segmented hot pressing, EVA matrix 4.2 0.20 ≥95 2 shoulder strap High-frequency welding + sewing + laser punching Strong bond 0.17 ≥93 3 lumbar support TPU hot melt adhesive film bonding 3.8 — — 4 Back pad / shoulder straps / lumbar pad Plasma pretreatment + segmented hot pressing + welding 4.2 0.21 96 5 Back pad Single-stage hot pressing + primer coating, polyurethane matrix 5.1 0.19 95 6 Back pad Plasma (argon) + polyethylene foaming 4.5 0.19 96 7 shoulder strap Sewing only (no high-frequency welding) Meets requirements 0.16 92 8 lumbar support EVA film + rapid cooling 4.0 — — 9 Back pad / shoulder straps / lumbar pad Comparison of different plasma atmospheres (argon) 4.8 0.15~0.22 92~96 10 Back pad Comparison of different perforation rates (15%–30%) Approximately 4.2 0.17~0.20 93~96

[0096] Note: "—" indicates that this item was not tested separately; "Strong bond" indicates that there was no delamination after 500 bending fatigue tests; "Meets requirements" indicates that there was no delamination after 300 bending fatigue tests.

[0097] As shown in Table 1, the backpack products obtained in each embodiment of the present invention all possess good interfacial bonding strength and excellent antibacterial and cooling properties. In particular, Example 4 employs a comprehensive process combining plasma pretreatment with segmented hot pressing and high-frequency welding, resulting in excellent overall performance for all components. The cooling coefficient of the back pad reaches 0.21 J / (cm²·s), and the antibacterial rate against Staphylococcus aureus reaches 96%. Example 5 further improves the peel strength to 5.1 N / cm by applying a polyurethane primer before hot pressing. Example 9 demonstrates that argon plasma treatment has a superior surface modification effect compared to nitrogen plasma treatment, achieving a peel strength of 4.8 N / cm. These data fully demonstrate that the method of the present invention can achieve a strong bond between the antibacterial and cooling materials and the various components of the backpack, ensuring effective functionality.

[0098] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. The application of an antibacterial cooling material in backpack production, characterized in that, Includes the following steps: S1: Process the antibacterial cooling material into sheet-like pieces; S2: The sheet-like cut pieces are combined with the base material layer on the back pad or shoulder strap of the backpack and the side in contact with the human body through a hot-pressing composite process to form a backpack contact layer. The hot-pressing composite process is carried out at a temperature of 120℃ to 160℃, a pressure of 0.3MPa to 0.8MPa, and a holding time of 30s to 90s.

2. The application of the antibacterial cooling material according to claim 1 in backpack production, characterized in that, The sheet-like cut pieces are obtained by die-cutting the antibacterial cooling material rolls according to the contour shape of the side of the backpack pad or shoulder strap that contacts the human body, with the cutting temperature controlled at 40℃~60℃ and the cutting speed controlled at 5m / min~15m / min.

3. The application of the antibacterial cooling material according to claim 1 in backpack production, before hot pressing and laminating, the sheet-like cut piece and the matrix material are preheated at a temperature of 80℃~100℃ for a time of 10s~30s; after hot pressing and laminating, they are cooled to room temperature at a cooling rate of 5℃ / min~15℃ / min.

4. The application of the antibacterial cooling material according to claim 1 in backpack production, characterized in that, The material of the back pad or shoulder strap of the backpack that comes into contact with the human body is selected from at least one of EVA foam, polyurethane foam or polyethylene foam, and the thickness of the base material is 5mm to 20mm.

5. The application of the antibacterial cooling material according to claim 1 in backpack production, characterized in that, It also includes processing antibacterial cooling material into strip-shaped pieces, wrapping the strip-shaped pieces around the core material of the backpack shoulder strap, and fixing them by sewing or high-frequency welding to form the contact layer of the shoulder strap; the width of the strip-shaped pieces is 30mm to 80mm and the thickness is 0.5mm to 2mm.

6. The application of the antibacterial cooling material according to claim 5 in backpack production, characterized in that, It also includes processing antibacterial cooling material into a bonding piece, and attaching the bonding piece to the surface of the backpack waist pad through a hot melt adhesive film bonding process, with a bonding temperature of 110℃~150℃ and a bonding pressure of 0.2MPa~0.5MPa.

7. The application of an antibacterial cooling material according to any one of claims 1 to 6 in backpack production, characterized in that, Before processing the antibacterial cooling material into cut pieces, the antibacterial cooling material is subjected to plasma surface treatment with a treatment power of 200W to 500W and a treatment time of 30s to 120s. The treatment atmosphere is nitrogen or argon.

8. The application of an antibacterial cooling material according to any one of claims 1 to 6 in backpack production, characterized in that, After the antibacterial cooling material is processed into cut pieces, the edges of the cut pieces are ultrasonically sealed with a sealing frequency of 20kHz to 40kHz and a sealing width of 2mm to 5mm.

9. The application of an antibacterial cooling material according to any one of claims 1 to 6 in backpack production, characterized in that, The hot-pressing composite process adopts a segmented hot-pressing method, which includes a first hot-pressing section and a second hot-pressing section in sequence. The temperature of the first hot-pressing section is 120℃~140℃, the pressure is 0.3MPa~0.5MPa, and the time is 20s~40s; The temperature of the second hot-pressing section is 140℃~160℃, the pressure is 0.5MPa~0.8MPa, and the time is 20s~50s.

10. The application of the antibacterial cooling material according to claim 1 in backpack production, characterized in that, It also includes a step of perforating the antibacterial cooling material, wherein the perforation process forms through holes with a diameter of 0.5 mm to 2 mm on the sheet or strip cut piece, and the opening rate of the through holes is 10% to 30%, and the perforation method is mechanical punching or laser punching.