Shoemaking hot-melt adhesive reinforcing cloth and reinforcing process thereof, and shoes

Abstract

The present invention relates to shoemaking hot-melt adhesive reinforcing cloth and a reinforcing process thereof, and shoes. The reinforcing cloth comprises a hot-melt adhesive and inner lining cloth. An adhesive is dispensed on the lower surface of the hot-melt adhesive. The adhesive is applied at the adhesive dispensing position, and the inner lining cloth is pressed on the adhesive so as to achieve preliminary bonding of the hot-melt adhesive and the inner lining cloth; or fixing is performed by means of a sewing machine so as to achieve preliminary connection of the hot-melt adhesive and the inner lining cloth. The part of the inner lining cloth that is not bonded or not connected to the hot-melt adhesive is turned over, first, an activation machine is used to soften the hot-melt adhesive by means of hot blowing, when the hot-melt adhesive is melted, the inner lining cloth adheres to the hot-melt adhesive, and then heel shaping is performed immediately.

Description

Hot melt adhesive reinforcing cloth for shoemaking, reinforcing process thereof and shoe Technical Field

[0001] The invention relates to the technical field of shoemaking, and in particular to a shoemaking hot melt adhesive reinforcement cloth, a shoe and a reinforcement process thereof. Background Art

[0002] As shoemaking technology continues to innovate, people are becoming more and more particular about shoes. They are very particular about the appearance, material, quality and comfort of shoes, and awareness of environmental protection is even more indispensable.

[0003] The reinforcing linings currently used in the shoemaking field are basically hot-stamped or cold-glued adhesive linings. Although they can play a reinforcing role, they are prone to wrinkling and deformation after wearing, and the shoe upper has poor shape retention effect.

[0004] If ordinary shoe linings are damp and not dried in time, they may easily delaminate or become moldy, reducing the service life of the shoes.

[0005] Special shoes such as those for public security, military, firefighting, and official duties have higher requirements for shape retention in order to reflect the overall shape and spirit of the shoes and clothing.

[0006] Therefore, the above problems need to be solved, and the hot melt adhesive reinforced lining process proposed in this application can solve the above technical problems.

[0007] Summary of the Invention

[0008] The present invention aims to provide a hot melt adhesive reinforcing cloth for shoemaking, a shoe and a reinforcing process thereof, and the technical problems to be solved include at least how to improve the shape retention effect of the shoe upper, avoid wrinkling and deformation, and increase the service life.

[0009] In order to achieve the above-mentioned object, the present invention provides a hot melt adhesive reinforcing cloth for shoemaking, comprising hot melt adhesive and an inner lining cloth, wherein adhesive is dispensed on the lower surface of the hot melt adhesive, adhesive is applied at the dispensed position, and the inner lining cloth is pressed onto the adhesive to achieve preliminary bonding of the hot melt adhesive and the inner lining cloth; or the hot melt adhesive and the inner lining cloth are initially connected by fixing with a sewing machine; the portion of the inner lining cloth that is not bonded or connected to the hot melt adhesive is turned over, the hot melt adhesive is first softened by hot blowing using an activator, and after the hot melt adhesive is melted, the inner lining cloth is bonded to the hot melt adhesive, and then the heel is immediately shaped.

[0010] Preferably, the temperature of the hot blowing of the activation machine is 160°C to 180°C.

[0011] Preferably, the hot blowing time of the activation machine is 30 seconds to 40 seconds.

[0012] Preferably, during the heel shaping process, the temperature of the cold mold is set below 0°C.

[0013] Preferably, during the shaping process of the heel, the temperature of the cold mold causes the hot melt adhesive and the inner lining to frost.

[0014] Preferably, the time for shaping the heel is 30 to 40 seconds.

[0015] Preferably, during the process of melting the hot melt adhesive and adhering the inner lining cloth to the hot melt adhesive, a hot-cold toe shaping machine is used to maintain the temperature of the bonding interface between the inner lining cloth and the hot melt adhesive between 100° C. and 120° C.

[0016] Preferably, the hot mold temperature of the hot-cold toe molding machine is set to 120° C. to 140° C. and maintained for 15 seconds to 20 seconds.

[0017] Preferably, the cold mold temperature of the hot-cold toe molding machine is set to below 0°C and maintained for 15 to 20 seconds.

[0018] Preferably, in the process of melting the hot melt adhesive and sticking the inner lining cloth to the hot melt adhesive, a flat laminating machine is used to complete the lamination of the inner lining cloth and the hot melt adhesive. The hot mold temperature of the flat laminating machine is set to 150°C to 170°C and maintained for 8 seconds to 12 seconds. After the lamination or pre-forming is completed, it is ready to enter the molding line.

[0019] Preferably, the adhesive is composed of 115 to 120 parts by weight of isooctyl acrylate, 0.5 to 0.6 parts by weight of an initiator, 25 to 30 parts by weight of an emulsifier, 12 to 14 parts by weight of a cross-linking agent, and 5.5 to 6.4 parts by weight of a tackifier.

[0020] Preferably, the initiator is sodium persulfate, the emulsifier is polyoxyethylene phenol ether, the cross-linking agent is melamine resin, and the adhesion promoter is terpene resin.

[0021] In a preferred embodiment, the adhesive is composed of 115 parts by weight of isooctyl acrylate, 0.5 parts by weight of sodium persulfate, 25 parts by weight of an emulsifier, 12 parts by weight of a melamine resin, and 5.5 parts by weight of a terpene resin.

[0022] In a preferred embodiment, the adhesive is composed of 120 parts by weight of isooctyl acrylate, 0.6 parts by weight of sodium persulfate, 30 parts by weight of an emulsifier, 14 parts by weight of a melamine resin, and 6.4 parts by weight of a terpene resin.

[0023] In a preferred embodiment, the adhesive is composed of 117 parts by weight of isooctyl acrylate, 0.55 parts by weight of sodium persulfate, 27 parts by weight of an emulsifier, 13 parts by weight of a melamine resin, and 6 parts by weight of a terpene resin.

[0024] Preferably, the temperature of the hot blowing of the activation machine conforms to the hot blowing temperature fitting curve, and the hot blowing temperature fitting curve is defined by the hot blowing temperature equation, which is:

[0025] Wherein, T1 is the actual hot blowing temperature of the activation machine, in °C; T0 is the preset hot blowing temperature, in °C; 160°C<T0<180°C; t is the hot blowing time, in seconds; 0<t<40 seconds.

[0026] The present application also provides a reinforcement process for a hot melt adhesive reinforcement cloth for shoemaking, comprising the following steps:

[0027] S1. An adhesive is prepared by using 115 to 120 parts by weight of isooctyl acrylate, 0.5 to 0.6 parts by weight of an initiator, 25 to 30 parts by weight of an emulsifier, 12 to 14 parts by weight of a cross-linking agent, and 5.5 to 6.4 parts by weight of a tackifier;

[0028] S2. Applying adhesive to the lower surface of the hot melt adhesive, applying adhesive to the adhesive spot, and pressing the inner lining fabric onto the adhesive to achieve a preliminary bonding between the hot melt adhesive and the inner lining fabric; or fixing the hot melt adhesive and the inner lining fabric by sewing.

[0029] S3. Turn over the part of the inner lining that is not bonded or connected to the hot melt adhesive. First, use an activation machine to soften the hot melt adhesive by blowing it with heat. After the hot melt adhesive melts, stick the inner lining to the hot melt adhesive. Then, immediately shape the heel.

[0030] Preferably, the hot blowing temperature of the activation machine conforms to a hot blowing temperature fitting curve, and the hot blowing temperature fitting curve is defined by a hot blowing temperature equation.

[0031] The present application also provides a shoe comprising the above-mentioned hot melt adhesive reinforcing cloth for shoemaking. Beneficial effects

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The shoemaking hot melt adhesive reinforcement cloth described in the present invention has strong adhesion and excellent cohesion, good elasticity, strong recovery force, good shaping effect, can fully express the shoe shape, and make the shoe shape more aesthetically pleasing. It is made of environmentally friendly raw materials and is 100% recyclable and reusable, with zero pollution to the environment. It does not require the use of solvents for processing, which is safe for the health of operators. It only requires simple operating equipment, saves electricity and labor, and can reduce the cumbersome traditional operating procedures. Once shaped, the material is not easy to deform and has a long activation time, which provides sufficient time for shoe climbing. It will not cause problems such as poor fit to the last due to the hot melt adhesive cooling too quickly, resulting in deformation and scrapping of the shoes.

[0034] The present application creatively proposes an adhesive component and the content of each component. By using the adhesive to stick the hot melt adhesive and the inner lining cloth together and activating it by hot blowing, the hot melt adhesive melts and sticks the inner lining cloth to the hot melt adhesive, and then the heel is immediately shaped, which can effectively extend the service life of the reinforcing cloth and achieve unexpected technical effects.

[0035] The present application also creatively proposes a hot blowing temperature equation, which can also effectively extend the service life of the reinforcing cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the specific embodiments of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0037] FIG1 is a schematic structural diagram of the hot melt adhesive reinforcing cloth for shoemaking according to the present invention. DETAILED DESCRIPTION

[0038] The present invention is described in more detail below to facilitate understanding of the present invention.

[0039] As shown in FIG1 , the shoemaking hot melt adhesive reinforcing cloth of the present invention includes a hot melt adhesive 1 and an inner lining cloth 2. Glue is dispensed on the lower surface of the hot melt adhesive 1, and adhesive is applied at the dispensed position. The inner lining cloth 2 is pressed onto the adhesive to achieve preliminary bonding of the hot melt adhesive 1 and the inner lining cloth 2. Alternatively, the hot melt adhesive 1 and the inner lining cloth 2 are initially connected by fixing with a sewing machine. The portion of the inner lining cloth that is not bonded or connected to the hot melt adhesive is turned over, and the hot melt adhesive is first softened by hot blowing using an activator. After the hot melt adhesive is melted, the inner lining cloth is bonded to the hot melt adhesive, and then the heel is immediately shaped.

[0040] Preferably, the temperature of the hot blowing of the activation machine is 160°C to 180°C.

[0041] Preferably, the hot blowing time of the activation machine is 30 seconds to 40 seconds.

[0042] Preferably, during the heel shaping process, the temperature of the cold mold is set below 0°C.

[0043] Preferably, during the shaping process of the heel, the temperature of the cold mold causes the hot melt adhesive 1 and the inner lining cloth 2 to frost.

[0044] Preferably, the time for shaping the heel is 30 to 40 seconds.

[0045] Preferably, during the process of melting the hot melt adhesive and adhering the inner lining cloth to the hot melt adhesive, a hot-cold toe shaping machine is used to maintain the temperature of the bonding interface between the inner lining cloth and the hot melt adhesive between 100° C. and 120° C.

[0046] Preferably, the hot mold temperature of the hot-cold toe molding machine is set to 120° C. to 140° C. and maintained for 15 seconds to 20 seconds.

[0047] Preferably, the cold mold temperature of the hot-cold toe molding machine is set to below 0°C and maintained for 15 to 20 seconds.

[0048] Preferably, in the process of melting the hot melt adhesive and sticking the inner lining cloth to the hot melt adhesive, a flat laminating machine is used to complete the lamination of the inner lining cloth and the hot melt adhesive. The hot mold temperature of the flat laminating machine is set to 150°C to 170°C and maintained for 8 seconds to 12 seconds. After the lamination or pre-forming is completed, it is ready to enter the molding line.

[0049] Preferably, the adhesive is composed of 115 to 120 parts by weight of isooctyl acrylate, 0.5 to 0.6 parts by weight of an initiator, 25 to 30 parts by weight of an emulsifier, 12 to 14 parts by weight of a cross-linking agent, and 5.5 to 6.4 parts by weight of a tackifier.

[0050] Preferably, the initiator is sodium persulfate, the emulsifier is polyoxyethylene phenol ether, the cross-linking agent is melamine resin, and the adhesion promoter is terpene resin.

[0051] In a preferred embodiment, the adhesive comprises 115 parts by weight of isooctyl acrylate, 0.5 parts by weight of sodium persulfate, 25 parts by weight of an emulsifier, 12 parts by weight of a melamine resin, and 5.5 parts by weight of a terpene resin. The hot-melt adhesive reinforcement fabric for footwear, produced by initially bonding the hot-melt adhesive 1 to the inner lining 2 using this adhesive, followed by activation in an activator and heel shaping, has a service life extended by 123% compared to a control sample without the adhesive.

[0052] In a preferred embodiment, the adhesive comprises 120 parts by weight of isooctyl acrylate, 0.6 parts by weight of sodium persulfate, 30 parts by weight of an emulsifier, 14 parts by weight of a melamine resin, and 6.4 parts by weight of a terpene resin. The hot-melt adhesive reinforcement fabric for footwear, produced by initially bonding the hot-melt adhesive 1 to the inner lining 2 using this adhesive, followed by activation in an activator and heel shaping, exhibited a 154% longer service life compared to a control sample without the adhesive.

[0053] In a preferred embodiment, the adhesive comprises 117 parts by weight of isooctyl acrylate, 0.55 parts by weight of sodium persulfate, 27 parts by weight of an emulsifier, 13 parts by weight of a melamine resin, and 6 parts by weight of a terpene resin. The hot-melt adhesive reinforcement fabric for footwear, produced by initially bonding the hot-melt adhesive 1 to the inner lining 2 using this adhesive, followed by activation in an activator and heel shaping, has a service life extended by 107% compared to a control example without the adhesive.

[0054] The applicant has also continuously adjusted the content of each component and conducted a large number of tests. The test results show that using components and contents within the above numerical ranges can extend the service life by at least 83% (the comparative examples do not use adhesives).

[0055] Preferably, the temperature of the hot blowing of the activation machine conforms to the hot blowing temperature fitting curve, and the hot blowing temperature fitting curve is defined by the hot blowing temperature equation, which is:

[0056] Wherein, T1 is the actual hot blowing temperature of the activation machine, in °C; T0 is the preset hot blowing temperature, in °C; 160°C<T0<180°C; t is the hot blowing time, in seconds; 0<t<40 seconds.

[0057] The hot-blowing temperature equation is a preferred formula derived through numerical simulation. Through experimental verification, the applicant found that the service life of the hot-melt adhesive reinforcement cloth for shoemaking produced by using the above-mentioned hot-blowing temperature equation for hot-blowing is extended by at least 176% compared with hot-blowing at a fixed temperature.

[0058] It should be noted that since the above-mentioned hot blowing temperature equation is obtained through numerical simulation and is not a physical equation derived through mathematical deduction, the units of the physical quantities in the equation do not participate in the calculation and only represent the numerical value. For example, when T0 is 160°C and the heating time t is 30 seconds, the units °C and seconds do not participate in the calculation. The unit of seconds is only used to represent the value of 30. If the unit is minutes, 30 seconds becomes 0.5 minutes, and the value of 30 becomes 0.5, which affects the final calculated result of the actual hot blowing temperature T1 of the activation machine.

[0059] The present application also provides a reinforcement process for a hot melt adhesive reinforcement cloth for shoemaking, comprising the following steps:

[0060] S1. An adhesive is prepared by using 115 to 120 parts by weight of isooctyl acrylate, 0.5 to 0.6 parts by weight of an initiator, 25 to 30 parts by weight of an emulsifier, 12 to 14 parts by weight of a cross-linking agent, and 5.5 to 6.4 parts by weight of a tackifier;

[0061] S2. Apply glue to the lower surface of the hot melt adhesive 1, apply adhesive to the glue-dotting position, and press the inner lining fabric 2 onto the adhesive to achieve preliminary bonding between the hot melt adhesive 1 and the inner lining fabric 2; or achieve preliminary connection between the hot melt adhesive 1 and the inner lining fabric 2 by fixing with a sewing machine;

[0062] Step 3: Unfold the inner lining fabric that is not bonded or connected to the hot melt adhesive. First, use an activator to soften the hot melt adhesive by blowing it with hot air. The temperature of the activator should be between 160°C and 180°C for 30 to 40 seconds. Once the hot melt adhesive has melted, adhere the inner lining fabric to the hot melt adhesive. Immediately proceed with the heel shaping process. During the heel shaping process, set the cold mold temperature below 0°C for optimal frosting. The heel shaping process should last for 30 to 40 seconds.

[0063] The advantage of using an activation machine is that the temperature is directly applied to the hot melt adhesive, so the hot melt adhesive can be fully activated, with the best shaping effect without damaging the inner lining and without glue overflow.

[0064] Preferably, the hot blowing temperature of the activation machine conforms to a hot blowing temperature fitting curve, and the hot blowing temperature fitting curve is defined by a hot blowing temperature equation.

[0065] The present application also provides a shoe comprising the above-mentioned hot melt adhesive reinforcing cloth for shoemaking.

[0066] The shoemaking hot melt adhesive reinforcement fabric described in the present application can withstand more than 50,000 flexures at room temperature, more than 30,000 flexures at -10°C, and a room temperature rebound (Dome Test) of more than 85%.

[0067] The hot melt adhesive reinforcing cloth for shoemaking described in this application has an operating temperature of (80-100)°C and can be operated by a roller-type hot press or a heat press. After pressing, it can be washed with water without wrinkling or delamination. It has a good effect of fixing and retaining the shape of the upper, which can improve the durability and firmness of the shoes. It has a waterproof function when it rains and will not get wet. It is easy to air dry in a ventilated place. Shoes are often moved around, and ordinary linings are more likely to fall off and the leather surface is prone to cracking. Hot melt adhesive linings are easy to operate and non-toxic. They have the characteristics of fast bonding, high strength, aging resistance, good thermal stability, and good film toughness. If the upper needs to be pressed with a high-frequency process such as concave and convex, it can fix the high-frequency concave and convex shape without deformation and lastingly fix it. When buckles are applied on the upper, hot melt adhesive can also improve the fastness of the buckles, making them less likely to fall off, reducing the cost of materials such as eyelet linings, thereby extending the service life of the shoes and achieving a good effect of retaining the shape of the upper.

[0068] The preferred embodiments of the present invention are described above, but they are not intended to limit the present invention. Those skilled in the art may make improvements and changes to the embodiments disclosed herein without departing from the scope and spirit of the present invention.

Claims

1. A hot melt adhesive reinforcement cloth for shoe making, characterized in that: The shoemaking hot melt adhesive reinforcing cloth comprises hot melt adhesive and inner lining cloth. Glue is dispensed on the lower surface of the hot melt adhesive, and the adhesive is applied at the glue dispensing position, and the inner lining cloth is pressed onto the adhesive to achieve preliminary bonding of the hot melt adhesive and the inner lining cloth; or the hot melt adhesive and the inner lining cloth are initially connected by fixing with a sewing machine; the part of the inner lining cloth that is not bonded or connected to the hot melt adhesive is turned over, and the hot melt adhesive is first softened by hot blowing with an activator, and the inner lining cloth is bonded to the hot melt adhesive after the hot melt adhesive is melted, and then the heel is immediately fixed.

2. The hot melt adhesive reinforcing cloth for shoemaking according to claim 1, characterized in that: The temperature of the hot blowing of the activation machine is 160°C to 180°C.

3. The hot melt adhesive reinforcing cloth for shoemaking according to claim 1, characterized in that: The heat blowing time of the activation machine is 30 seconds to 40 seconds.

4. The hot melt adhesive reinforcing cloth for shoemaking according to claim 1, characterized in that: During the heel shaping process, the cold mold shaping temperature is set below 0°C.

5. The hot melt adhesive reinforcing cloth for shoemaking according to claim 1, characterized in that: During the shaping process of the back heel, the temperature of the cold mold shaping causes the hot melt adhesive and the inner lining cloth to frost.

6. The hot melt adhesive reinforcing cloth for shoemaking according to claim 1, characterized in that: The time for shaping the heel is 30 to 40 seconds.

7. The hot melt adhesive reinforcing cloth for shoemaking according to claim 1, characterized in that: In the process of melting the hot melt adhesive and bonding the inner lining cloth to the hot melt adhesive, a hot-cold toe cap shaping machine is used to maintain the temperature of the bonding interface between the inner lining cloth and the hot melt adhesive between 100° C. and 120° C.

8. The hot melt adhesive reinforcing cloth for shoemaking according to claim 1, characterized in that: The adhesive is composed of 115 to 120 parts by weight of isooctyl acrylate, 0.5 to 0.6 parts by weight of an initiator, 25 to 30 parts by weight of an emulsifier, 12 to 14 parts by weight of a crosslinking agent and 5.5 to 6.4 parts by weight of a tackifier.

9. The hot melt adhesive reinforcing cloth for shoemaking according to claim 8, characterized in that: The initiator is sodium persulfate, the emulsifier is polyoxyethylene phenol ether, the cross-linking agent is melamine resin, and the viscosity-increasing auxiliary agent is terpene resin.

10. The hot melt adhesive reinforcing cloth for shoemaking according to claim 1, characterized in that: The temperature of the hot blowing of the activation machine conforms to the hot blowing temperature fitting curve, and the hot blowing temperature fitting curve is defined by the hot blowing temperature equation, and the hot blowing temperature equation is: Among them, T1 is the actual hot blowing temperature of the activation machine, in °C; T0 is the preset hot blowing temperature, in °C; 160℃<T0<180℃; t is the hot blowing time, in seconds; 0<t<40 seconds.

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