A method for manufacturing a waterproof shoe

Abstract

The application discloses a manufacturing method of waterproof shoes, comprising the following steps: carrying out anti-syphoning treatment on the raw yarn of upper material and lining material; combining the lining material and a bio-based waterproof film through a pre-combination process to form a composite lining; cutting components; setting a hot melt adhesive film between the upper and the composite lining, and integrating by high-temperature fusing; splicing the heel of the upper, coating waterproof adhesive, combining waterproof adhesive strips, and high-temperature shaping and fusing; pulling the upper and the insole, covering waterproof insole sheets on the insole cloth, and high-temperature softening and fusing; and pressing the sole; the bio-based waterproof film is pre-combined with the lining material, so that wrinkles and glue peeling defects caused by three-dimensional surface combination are avoided, the waterproof film is completely hidden in the upper, and there is no combination trace on the appearance; in combination with heel multi-waterproof treatment and a sealing mode of waterproof insole sheet covering the pull-up line, comprehensive waterproof is realized; the bio-based waterproof film has the characteristics of high moisture permeability, high wear resistance, high temperature resistance and environmental protection, and meets the comprehensive performance requirements of high-end shoe materials.

Description

Technical fields: This invention relates to the field of footwear manufacturing technology, and more specifically, to a method for manufacturing waterproof shoes. Background technology: Waterproof shoes have become a necessity in daily life and outdoor sports, effectively addressing foot moisture issues during rainy commutes and in damp outdoor environments. However, existing waterproof shoe products suffer from the following technical shortcomings: Most existing waterproof shoes use a sock-like waterproof structure or a back-mounted membrane structure, where the waterproof membrane is bonded to the upper after the upper has been formed. This process easily reveals bonding marks on the shoe's appearance, affecting the shoe's aesthetics. Furthermore, during the bonding process, uneven temperature control, unbalanced pressure distribution, and uneven glue application can easily lead to wrinkles and weak adhesion of the waterproof membrane, ultimately compromising its waterproof integrity.

[0003] In addition, some waterproof shoes use non-breathable waterproof membranes or increase the thickness of the waterproof layer to ensure waterproof performance, which reduces the breathability of the shoe upper and increases the weight of the shoe, making them particularly unsuitable for long-term sports activities such as running. Summary of the Invention: The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a method for manufacturing waterproof shoes. This method can achieve a hidden design of the waterproof membrane, improve the stability of waterproof performance, and take into account the breathability and lightness of the shoe upper.

[0004] Research has revealed that the reason why the post-bonding process of waterproof membranes to shoe uppers in existing waterproof shoe manufacturing methods is prone to wrinkles and weak adhesion is fundamentally due to the fact that the waterproof membrane and shoe upper material are separate before bonding. The shoe upper material is pre-formed and has a three-dimensional curved structure. During bonding, the waterproof membrane needs to be smoothly bonded to this three-dimensional curved surface, which places extremely high demands on the temperature control, pressure uniformity, and adhesive application precision of the bonding equipment. When the temperature distribution is uneven or the pressure is unbalanced, a uniform adhesive interface cannot be formed between the waterproof membrane and the shoe upper material, leading to localized wrinkling or delamination, creating seepage channels.

[0005] Meanwhile, in the existing process, the inner lining of the shoe upper and the upper material are respectively bonded to the waterproof membrane, forming a sandwich structure of "upper material-waterproof membrane-inner material". However, in areas with drastic curvature changes such as the heel and tongue of the shoe upper, the waterproof membrane is prone to micro-cracks due to stress concentration, which further reduces the reliability of waterproofing.

[0006] Based on the above attribution analysis, the present invention proposes the following technical solution: Option 1: A method for manufacturing waterproof shoes includes the following steps: Step 1: Treat the raw yarn of the shoe upper and lining materials with anti-wicking treatment; Step 2: The inner lining material is bonded to the bio-based waterproof membrane using a pre-composite process to form a composite lining; Step 3: Cut the upper material, composite lining, and other accessories into parts; Step 4: Place a hot melt adhesive film between the shoe upper and the composite lining, and use a high-temperature melting process to make it a single piece; Step 5: Sew the heel of the molded shoe upper together, apply waterproof glue to the seam, attach waterproof tape, and then use high temperature to fix and fuse it together; Step Six: Extend the upper and reinforce the midsole, then cover the midsole fabric with a waterproof midsole sheet and soften it with high temperature to fuse it with the upper; Step 7: Press the upper and sole together to form the finished shoe.

[0007] Option 1 utilizes a pre-composite process where the inner lining material is bonded to a bio-based waterproof membrane to form a composite lining. This approach changes the traditional method of bonding the waterproof membrane to the upper laterally. Because the pre-composite process is performed in a planar state, temperature, pressure, and adhesive dosage can be precisely controlled, achieving a uniform, wrinkle-free bond between the waterproof membrane and the lining material. This fundamentally avoids the defects associated with bonding to three-dimensional curved surfaces. Simultaneously, the composite lining and upper are integrally formed through high-temperature melting, completely concealing the waterproof membrane within the upper, leaving no visible bonding marks. At the heel, waterproof adhesive is applied, waterproof strips are bonded, and then fused at high temperature. Additionally, a waterproof midsole sheet is applied to the midsole fabric and then softened and fused at high temperature. These methods seal two potential water seepage paths: the heel seam and the lasting line, achieving comprehensive waterproofing for the upper.

[0008] Option 2: Option 2 is based on Option 1. The pre-composite process in step 2 uses a mesh roller bonding process. The mesh roller is a 5853 mesh roller with a mesh count of 840. The bonding temperature is 105℃, the bonding speed is 12M / min, and the bonding gap is -0.1mm.

[0009] Option 2 was adopted, using a 5853 mesh roller (840 mesh) and specific bonding temperature, speed, and gap to achieve point-like bonding between the bio-based waterproof membrane and the inner lining material. The mesh-like bonding points not only ensured the peel strength of the composite lining but also retained continuous microchannels in the unbonded areas, facilitating gas escape during subsequent hot melt adhesive film melting and avoiding air bubble residue. In addition, the point-like bonding structure reduced the negative impact of the adhesive layer on waterproof and breathable performance, enabling the composite lining to maintain excellent breathability while possessing good waterproof properties.

[0010] Option 3: Option 3 is based on Option 1, wherein the bio-based waterproof membrane is made of a casting solution containing bio-based polyurethane resin, wear-resistant high specific heat particles, pore-forming agent, and coupling agent.

[0011] Option 3 is adopted, where the bio-based waterproof membrane uses bio-based polyurethane resin as the matrix, possessing excellent environmental performance. The introduction of wear-resistant, high-specific-heat particles enables the membrane to effectively disperse stress and absorb localized frictional heat when subjected to frictional stress, delaying the thermal softening of the matrix and improving wear resistance. The addition of a pore-forming agent provides a structural basis for subsequent phase separation and pore formation, ensuring that the membrane material has good moisture permeability.

[0012] Option 4: Option 4 is based on Option 3, wherein the bio-based content of the bio-based polyurethane resin is greater than or equal to 60%; the average particle size of the wear-resistant high specific heat particles is 50nm to 500nm, and the addition amount is 8 to 12 parts; the amount of the porogen is 5 to 10 parts; and the amount of the coupling agent is 1% to 3% of the mass of the bio-based polyurethane resin.

[0013] Scheme Four was adopted, which further optimized the overall performance of the bio-based waterproof membrane by precisely limiting the raw material parameters. A bio-based content of ≥60% ensures the material's environmental friendliness; the particle size and addition amount of the wear-resistant, high-specific-heat particles are controlled within the above-mentioned range, ensuring uniform dispersion of particles in the casting solution and avoiding membrane defects caused by particle agglomeration; the pore-forming agent dosage is 5-10 parts, which can form a uniform, interconnected microporous structure during phase separation, balancing moisture permeability and hydrostatic pressure; the coupling agent addition amount is 1%-3%, ensuring the interfacial bonding strength between the wear-resistant particles and the polyurethane matrix, preventing particles from detaching during friction.

[0014] Option 5: Option 5 is based on Option 1. In step 3, the upper material is cut into the upper, the waterproof wing of the tongue, and the tongue. First, the upper and the waterproof wing of the tongue are sewn together, and then they are joined to the tongue to form a complete upper.

[0015] Option five involves pre-sewing the waterproof wing on the tongue as an independent component to the upper before joining it to the tongue, forming a waterproof barrier in the tongue area. When water flows in through the shoe opening, the waterproof wing prevents water from directly entering the shoe cavity. Water can only enter when the water level exceeds the seam between the waterproof wing and the tongue, thus effectively improving the waterproof seal of the tongue area.

[0016] Option Six: Option 6 is based on Option 5, wherein the upper, the waterproof wing of the tongue, and the tongue are made of the same or different materials.

[0017] Option six, by allowing the upper, waterproof wing of the tongue, and the tongue to be made of the same or different materials, provides greater flexibility in material selection for shoe design. For example, the upper can be made of a more abrasion-resistant material, the tongue of a more flexible material, and the waterproof wing of the tongue of a material with superior waterproof performance, achieving differentiated configurations of performance in different areas.

[0018] Option Seven: Option 7 is based on Option 1. After the composite lining described in step 3 is cut and shaped, it is applied to the corresponding areas of the upper and the waterproof wing of the tongue.

[0019] Option 7 is adopted, with the composite lining covering the corresponding areas of the upper and the waterproof wing of the tongue, ensuring that the waterproof membrane covers the main body of the upper and the area of ​​the waterproof wing of the tongue, eliminating the waterproof blind spot at the junction of the waterproof wing of the tongue and the upper, and achieving waterproof sealing around the upper.

[0020] Option 8: Option 8 is based on Option 1. In step 5, the heel of the fused upper is sewn together, waterproof webbing is sewn on, and waterproof glue is applied to the back of the sewn webbing on the heel to plug the needle holes. At the same time, waterproof strips are attached, and the heel is shaped using a high-temperature setting machine to fuse the waterproof strips with the upper.

[0021] Option 8 employs multiple protective measures, including waterproof webbing, waterproof adhesive to plug needle holes, waterproof strip bonding, and high-temperature setting and fusion, to completely seal the potential water seepage path at the heel seam. Waterproof adhesive directly plugs the needle holes in the seams, waterproof strips cover the seam surface, and high-temperature setting fuses the waterproof strips to the shoe upper, forming a continuous and reliable waterproof seal.

[0022] Option Nine: Option 9 is based on Option 5, and the waterproof wing of the shoe tongue is integrated with the upper to enhance the waterproof sealing of the shoe tongue area.

[0023] Option nine adopts an integrated structural design where the waterproof wing of the tongue is integrated with the upper, creating a continuous transition between the waterproof wing and the upper. This eliminates the gaps at the traditional joint between the tongue and the upper, further enhancing the waterproof sealing of the tongue area.

[0024] Compared with the prior art, the present invention has the following beneficial effects: Excellent and stable waterproof performance: By pre-composite the inner material with the bio-based waterproof membrane, the process defects such as wrinkles and delamination caused by the three-dimensional curved surface bonding are fundamentally avoided; combined with the multiple waterproof treatments of the heel seam and the sealing method of the waterproof midsole covering the lasting line, the upper is fully waterproofed, and the stability of waterproof performance is greatly improved.

[0025] The concealed design enhances the aesthetics: the waterproof membrane is completely hidden inside the shoe upper through pre-composite and high-temperature melting processes, leaving no visible traces of bonding and maintaining the original design style of the shoe. This solves the aesthetic problem of "visible waterproof structure" in traditional waterproof shoes.

[0026] Combining breathability, comfort, and environmental friendliness: The bio-based waterproof membrane uses bio-based polyurethane resin with a bio-based content of over 60%, making it more environmentally friendly than traditional petroleum-based waterproof membranes; through a pre-composite process of dot-bonding and a microporous structure controlled by a pore-forming agent, the membrane material's high moisture permeability is ensured, allowing the feet to breathe and not feel stuffy when worn.

[0027] Excellent abrasion resistance: The bio-based waterproof membrane incorporates abrasion-resistant, high-specific-heat particles, which delay the thermal softening of the substrate through stress dispersion and localized heat absorption, significantly improving the abrasion resistance of the membrane material and meeting the needs of sports scenarios such as running and outdoor hiking.

[0028] Wide range of applications: Combining waterproof, breathable, and lightweight features, it is not only suitable for daily commutes, but also for sports activities such as running and outdoor hiking, thus expanding the product's applicability. Detailed implementation method: To make the technical problems, technical solutions, and beneficial effects of this invention clearer and more understandable, the invention will be further described in detail below with reference to the embodiments.

[0030] 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 preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims and description of this invention is for distinguishing different objects, not for describing a specific order.

[0032] Unless otherwise expressly defined, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" in the claims and description of this invention is merely for the convenience of describing the invention and simplifying the description, and is not intended to 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 limiting the specific scope of protection of this invention.

[0033] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims and description of this invention should be interpreted broadly, that is, any connection in which there is no displacement relationship or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection, and fixed connection by other means or components.

[0034] In the claims and description of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0035] Example 1 This embodiment provides a method for manufacturing waterproof shoes, including the following steps: Step 1: Anti-siphon treatment The raw yarns of the shoe upper and lining materials are treated with an anti-wicking process to make them waterproof.

[0036] Step 2: Preparation of Composite Lining The inner material 2 is bonded to the bio-based waterproof membrane 1 through a pre-composite process to form a composite inner material 3.

[0037] Step 3: Cutting the parts Cut the upper material into upper 4, waterproof wing of the tongue 5, and tongue 6. Cut the composite lining 3 and other auxiliary materials into parts of corresponding shapes.

[0038] Step 4: Assemble the shoe upper First, connect the upper 4 to the waterproof wing 5 of the tongue with stitching. Then, connect the front half of the tongue 6 to the waterproof wing 5 of the tongue with stitching, leaving the rear end of the tongue free to form a complete upper.

[0039] Step 5: Composite lining and upper are molded as a single piece. A hot melt adhesive film is placed between the upper 4 and the composite lining 3, and then formed into a single piece through a high-temperature melting process. The high-temperature melting process is carried out at a temperature of 150℃, which ensures a firm bond between the upper and the composite lining, and the bio-based waterproof membrane is completely hidden inside the upper.

[0040] Step Six: Waterproofing the Heel After the upper is formed, the heel seam is sewn together with a sewing machine. Waterproof glue is applied to the back of the sewing thread to plug the needle holes. Waterproof webbing 7 is attached to the outside of the seam, and then waterproof adhesive strip is attached. The waterproof adhesive strip is then fused to the upper by a high-temperature setting machine.

[0041] Step 7: Lay out the midsole and cover it with a waterproof midsole piece. The upper is reinforced with a midsole, sealing the bottom of the upper. A waterproof midsole sheet, made of hot-melt adhesive film, is then placed over the midsole fabric, with its edges completely covering the reinforcement seams. High-temperature softening fuses the waterproof midsole sheet to the upper, sealing the reinforcement seams.

[0042] Step 8: Press the sole together The upper and sole are pressed together to form the finished shoe.

[0043] Example 2 This embodiment provides a method for manufacturing waterproof shoes, which differs from Embodiment 1 in that: In step two, the raw material parameters of the bio-based waterproof membrane are as follows: the bio-based content of the bio-based polyurethane resin is 65%; the wear-resistant high specific heat particles are selected from zirconium oxide micro powder with an average particle size of 300nm, and the addition amount is 12 parts; the pore-forming agent is added in the amount of 10 parts; and the coupling agent is added in the amount of 2.5% of the mass of the bio-based polyurethane resin.

[0044] The remaining steps are the same as in Example 1.

[0045] Example 3 This embodiment provides a method for manufacturing waterproof shoes, which differs from Embodiment 1 in that: In step two, the raw material parameters of the bio-based waterproof membrane are as follows: the bio-based content of the bio-based polyurethane resin is 70%; the wear-resistant high specific heat particles are alumina powder with an average particle size of 200nm and calcium carbonate powder with an average particle size of 100nm mixed in a 1:1 ratio, with a total addition amount of 11 parts; the pore-forming agent addition amount is 9 parts; and the coupling agent addition amount is 3% of the mass of the bio-based polyurethane resin.

[0046] The remaining steps are the same as in Example 1.

[0047] The waterproof shoes made using the method of this invention have good moisture permeability, waterproof performance, abrasion resistance and high temperature resistance, and can meet the comprehensive performance requirements of high-end shoe materials for waterproof, moisture permeability, abrasion resistance and high temperature resistance.

[0048] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A method for manufacturing waterproof shoes, characterized in that, Includes the following steps: Step 1: Treat the raw yarn of the shoe upper and lining materials with anti-wicking treatment; Step 2: The inner lining material is bonded to the bio-based waterproof membrane using a pre-composite process to form a composite lining; Step 3: Cut the upper material, composite lining, and other accessories into parts; Step 4: Place a hot melt adhesive film between the shoe upper and the composite lining, and use a high-temperature melting process to make it a single piece; Step 5: Sew the heel of the molded shoe upper together, apply waterproof glue to the seam, attach waterproof tape, and then use high temperature to fix and fuse it together; Step Six: Extend the upper and reinforce the midsole, then cover the midsole fabric with a waterproof midsole sheet and soften it with high temperature to fuse it with the upper; Step 7: Press the upper and sole together to form the finished shoe.

2. The method for manufacturing a waterproof shoe according to claim 1, characterized in that: In step two, the pre-composite process uses a mesh roller for bonding. The mesh roller is a 5853 mesh roller with a mesh count of 840. The bonding temperature is 105℃, the bonding speed is 12M / min, and the bonding gap is -0.1mm.

3. The method for manufacturing a waterproof shoe according to claim 1, characterized in that: The bio-based waterproof membrane is made from a casting solution containing bio-based polyurethane resin, wear-resistant high specific heat particles, pore-forming agent, and coupling agent.

4. The method for manufacturing a waterproof shoe according to claim 3, characterized in that: The bio-based polyurethane resin has a bio-based content greater than or equal to 60%; the wear-resistant high specific heat particles have an average particle size of 50 nm to 500 nm and are added in an amount of 8 to 12 parts; the porogen is used in an amount of 5 to 10 parts; and the coupling agent is added in an amount of 1% to 3% of the mass of the bio-based polyurethane resin.

5. The method for manufacturing a waterproof shoe according to claim 1, characterized in that: In step three, the shoe upper material is cut into the shoe upper, the waterproof wing of the tongue, and the tongue. First, the shoe upper and the waterproof wing of the tongue are sewn together, and then they are joined together with the tongue to form a complete shoe upper.

6. The method for manufacturing a waterproof shoe according to claim 5, characterized in that: The upper, the waterproof wing of the tongue, and the tongue may be made of the same or different materials.

7. The method for manufacturing a waterproof shoe according to claim 1, characterized in that: In step three, the composite lining is cut and shaped, and then applied to the corresponding areas of the upper and the waterproof wing of the tongue.

8. The method for manufacturing a waterproof shoe according to claim 1, characterized in that: In step five, the heel of the fused upper is sewn together, waterproof webbing is sewed on, and waterproof glue is applied to the back of the stitches on the heel webbing to plug the needle holes. At the same time, waterproof adhesive strips are attached, and the heel is shaped using a high-temperature setting machine to fuse the waterproof adhesive strips with the upper.

9. A method for manufacturing a waterproof shoe according to claim 5, characterized in that: The integrated design of the waterproof wing on the tongue and the upper enhances the waterproof seal of the tongue area.