TW201536202A - Adhesion processing method for shoes - Google Patents

Abstract

The present invention is related to shoe parts adhesion process having steps of (1) surface treatment, (2) spraying adhesion material powder, (3) melting the adhesion material powder and (4) pressing. The surface treatment may be plasma treatment or ion bombardment. The spraying adhesion material powder may be an electro-static spraying method. Thus, a totally or partially dry adhesion method is provided for an outer sole and mid-sole of a shoe is disclosed. Harmful organic acids used in the prior art may be completely replaced by the present invention, thus a safety-working environment of a shoe manufacture is achieved.

Description

Sole construction followed by process method

The present invention is directed to a method of subsequent processing, and more particularly to a method of further processing a sole or all of a dry sole assembly.

Shoes are an indispensable necessities for modern people. Different shoes and different needs must be worn for different occasions and different needs.

In the process of manufacturing shoes, how to make a durable, comfortable, non-delayed sole has always been a major challenge for shoemakers. In order to achieve comfort, it is often necessary to select a combination of materials with different material characteristics and properties, so that the shoes have both wear resistance, good elasticity, and protection of the soles.

Please refer to FIG. 1. In order to combine the different materials of the various parts of the shoe A, the combination of the outer bottom A1 (Outer Sole) and the foam one midsole A2 (Mid-Sole) is taken as an example, due to the surface of the large bottom A1. Various types, it is difficult to use automatic coating of machine equipment. At present, the most common process method is to apply artificial coating to the surface treatment agent of the organic solvent type to the outsole A1 and the midsole A2, and then use manual coating. The cloth is applied to the outsole A1 after the solvent type adhesive is applied to the outsole A1 and the midsole A2. After the combination of the outsole A1 and the midsole A2 is completed, it is combined with an upper A3 to complete the manufacture of the shoe A.

However, wet processes such as organic surface treatment agents or solvent-based adhesives have considerable harm to the environment, and are processed in the process of manufacturing organic solvents, wastes after the gluing process, etc., and also cause manufacturers to be larger. The cost of the treatment; moreover, the various organic solvents used in the wet process are extremely unrecoverable for the health of the construction workers. Therefore, how to reduce or completely remove the organic solvent that may cause harm to the human body/environment during the shoe making process is a technical problem that needs to be solved at present.

In order to solve the technical problems of the environment, the human body and the like caused by the combination of the existing sole and the midsole and the like, the present invention provides a sole structure and a manufacturing method, and the steps thereof include:

Spraying bonding compound: spraying a powdered bonding compound on one of a large bottom or a midsole;

Melt-bonding compound: heating the bonding compound to melt and evenly distribute the bonding compound attached to the bonding surface to the bonding surface;

Pressing: the midsole is taken and the joint surface of the midsole is pressed against the joint surface of the outsole, and the midsole is firmly combined with the outsole.

Wherein, the spraying and bonding step uses electrostatic spraying to electrostatically adhere the powdered bonding compound to the bonding surface of the outsole.

The electrostatic spraying method is a high voltage electric shock type electrostatic spraying or a friction type electrostatic spraying.

Wherein, before the spraying of the bonding compound, a wet surface treatment or a dry surface treatment process step is applied, and the wet surface treatment is applied to the combination by using a solvent type treatment agent, an aqueous treatment agent or a solventless treatment agent. And causing the bonding surface to change a surface state, causing the bonding surface to change the surface state, causing the bonding surface to have more functional groups, oxidizing the bonding surface, and forming the bonding surface to form a surface coating layer.

Wherein, before the spraying of the bonding compound, a surface treatment process step is performed, and the bonding surface of the outsole and the midsole to be combined is subjected to a surface treatment process, wherein the surface treatment process is a dry surface treatment process, Vacuum plasma treatment, normal piezoelectric slurry treatment, ion bombardment mode or photoreactive surface treatment, the bonding surface has more functional groups, roughening or increasing surface energy.

As can be seen from the foregoing description, the present embodiment has the following features:

1. It can choose to complete the dry process, without using organic and volatile solvents harmful to the environment and human body. Reducing the use of organic solvents can greatly reduce the cost of public security management of hazardous solvents for shoe factories.

2. Compared with the conventional use of solvent-based adhesives, the present invention utilizes electrostatic means to uniformly, quickly and automatically apply the bonding compound to the outsole and the midsole of various complex surface types, not only to solve the conventional technology. The solvent and the solvent may cause human and environmental hazards, and the powder combined with the rubber will not be volatilized during the use process and can be recycled, thereby greatly reducing the material cost.

3. Using the above-mentioned electrostatic spraying and dry surface treatment process, a fully automated shoe outsole and midsole bonding process can be realized, which has excellent industrial utilization.

The sole structure of the present invention is a dry subsequent process method, and the steps thereof include:

STEP 1. Surface treatment process: A surface treatment process is applied to one of the joint surfaces of one of the Outer Sole and the Mid-sole. The type of the surface treatment process is not limited and may be a conventional wet surface treatment process or preferably a dry surface treatment process or a photoreactive surface treatment process. The surface treatment process aims to produce a surface state change on the surface of the bonding surface, so that the bonding surface has more functional groups, roughening or increasing surface energy, etc., so that the bonding surface of the outsole and the midsole is more closely closed. Combine.

The so-called conventional wet surface treatment process is applied to the bonding surface by using a solvent-type treating agent, an aqueous treating agent or a solvent-free treating agent to cause the bonding surface to change the surface state. The solvent-free treating agent contains a coupling agent, a UV-type treating agent, and the like.

The so-called dry surface treatment process may be a vacuum plasma treatment, a normal piezoelectric slurry treatment or an ion bombardment process; the photoreactive surface treatment process is after coating a photoreactive surface treatment agent, and then transmitting light (such as The ultraviolet light irradiation method causes the bonding surface to change the surface state to form a surface treatment which is easy to bond or conform.

The surface treatment manner of the joint surface of the outsole and the midsole is not limited, for example, the dry surface treatment process is used to treat the joint surface of the outsole, and the midsole is selected from a photoreactive surface treatment process; or, the bottom and middle portions are used. The bottom surface is selected from the dry surface treatment process or the photoreaction surface treatment process; or the midsole is selected from a dry surface treatment process, and the outsole is selected from a photoreactive surface treatment process. The surface treatment of the combination of the outsole and the midsole may also be carried out using a conventional solvent-based surface treatment followed by a subsequent dry process.

In this embodiment, the surface treatment of the midsole of the outsole is performed by batch plasma treatment, and the surface treatment process is applied to the joint surface of the midsole by a plasma treatment or a photoreaction surface treatment process to realize a full dry process. .

The vacuum plasma treatment described above places the outsole and the midsole into a chamber, generates a power supply of 100 to 500 W of the RF power supply of the plasma, and evacuates the chamber to 1 to 5×10. ^-2 torr vacuum degree, and then input oxygen gas, nitrogen gas or argon gas as the gas source of the plasma at a flow rate of 10 to 100 cc / min, so that the gas source continues to form a plasma, the outsole or the midsole The bonding surface is subjected to a surface treatment.

In the photoreaction surface treatment, the type of the photoreactive surface treatment agent to be used is not limited, and for example, a surface type treatment agent such as a powder type photoinitiator which reacts with light of a wavelength such as ultraviolet light, The bonding surface coated or distributed on the midsole is irradiated with light such as ultraviolet light (UV) to enhance the bonding characteristics of the bonding surface. The material of the outsole used in this embodiment may be selected from the group consisting of rubber, thermoplastic elastomer (TPE), ethylene-vinyl acetate copolymer (EVA), and thermoplastic polyurethane (Thermoplastic Polyurethanes). , TPU) and a mixture of the mixture, and the common material of the midsole is a mixture of ethylene-vinyl acetate copolymer (EVA) as a main component.

Further, the aforementioned surface treatment can also be treated by a normal piezoelectric slurry in an atmospheric operating environment, so that the overall surface treatment process can be more advantageous for continuous production. The so-called Atmospheric-pressure plasma is a device that generates plasma at a pressure of approximately one atmosphere, so that it is not necessary to generate plasma under a high vacuum state, so that this embodiment can The surface treatment process of the outsole or the midsole can achieve the technical effect of continuous manufacturing by continuous conveying with other front and back processes.

The ion bombardment process generally performs surface treatment by ion bombardment of the combination surface of the outsole or the midsole in a vacuum environment, so that the bonding surface is changed in surface state to have a functional group, a surface energy, or a surface that is easy to bond. characteristic.

It is verified that the outsole or the midsole is effective after the surface treatment. In this embodiment, after the surface treatment of the vacuum plasma is completed, a surface contact process is used to judge the surface treatment process, and the joint surface of the outsole is The contact angle of water droplets before and after the surface treatment process is decreased from 95 degrees to 50 degrees; and the contact angle of the water droplets of the midsole before and after the surface treatment process is decreased from 130 degrees to 85 degrees, thereby confirming the outsole and the The combination of the midsole has a better bond after the surface treatment process.

The surface treatment process step is not absolutely necessary. For the outsole and the midsole having the good bonding characteristics of the bonding surface itself, the next step is directly performed without performing a surface treatment process.

STEP 2. Spraying the bonding compound: spraying a powdered bonding compound on the bonding surface of the outsole, in order to allow the bonding compound to be effectively attached to the bonding surface of the outsole, the embodiment utilizes electrostatic spraying In a manner, the powdered hot melt adhesive is charged by an electrostatic spraying device and then sucked on the joint surface of the outsole or the midsole. The type of the electrostatic spraying device is not limited, and may be a corona powder coating. A spraying device or a tribo powder coating electrostatic spraying device, wherein the high-voltage electric shock type electrostatic spraying device forms a powdery bonding compound through a high voltage process and has a negative electric output formed on the bonding surface, the friction charging The electrostatic spraying device generally forms a powdery bonding compound positively formed on the bonding surface; wherein the bonding rubber is not limited in type, and may be a hot-melt or thermoplastic hot-melt adhesive. The material may be in the form of a solid powder without being heated (for example, at room temperature).

STEP 3. Melt bonding compound: heating the bonding compound of the bonding surface, so that the bonding compound adhered to the bonding surface is melted and uniformly distributed on the bonding surface. The means for melting the combined rubber is not limited, and can be heated by an oven, an infrared ray, an electrothermal type, or a plasma.

STEP 4. Pressing: Using the automatic equipment, the midsole is taken and the joint surface of the midsole and the joint of the outsole is pressed by the mold, and the midsole is firmly combined with the outsole.

After the combination of the outsole and the midsole of the present embodiment by the dry-process method described above, the test can be performed through a cold-heat cycle test, a low-temperature test, a water wash test, and a hydrolysis test, and the outsole and the midsole are still in good condition. The combination.

As can be seen from the foregoing description, the present embodiment has the following features:

1. It can choose to complete the dry process, without using organic and volatile solvents harmful to the environment and human body. Reducing the use of organic solvents can greatly reduce the cost of public security management of hazardous solvents for shoe factories.

2. Compared with the conventional use of solvent-based adhesives, the present invention utilizes electrostatic means to uniformly, quickly and automatically apply the bonding compound to the outsole and the midsole of various complex surface types, not only to solve the conventional technology. The solvent and the solvent may cause human and environmental hazards, and the powder combined with the rubber will not be volatilized during the use process and can be recycled, thereby greatly reducing the material cost.

3. Using the above-mentioned electrostatic spraying and dry surface treatment process, a fully automated shoe outsole and midsole bonding process can be realized, which has excellent industrial utilization.

A‧‧‧ shoes
A1‧‧‧ outsole
A2‧‧‧ midsole
A3‧‧‧ upper

Figure 1 is a schematic view showing the structure of the outsole and the midsole of the shoe. 2 is a flow chart showing the steps of a preferred embodiment of the present invention.

A‧‧‧ shoes

A1‧‧‧ outsole

A2‧‧‧ midsole

A3‧‧‧ upper

Claims (9)

A sole structure and a process method, the method comprising the steps of: spraying a bonding compound: spraying a powdered bonding compound on a joint surface of a large bottom or a middle bottom; melting the bonding compound: heating the bonding compound, The bonding compound adhered to the bonding surface is melted and uniformly distributed on the bonding surface; and pressing: taking the midsole and pressing the bonding surface of the midsole with the bonding surface of the outsole, and pressing The midsole is firmly bonded to the outsole. The sole structure and the process method according to claim 1, wherein the spray-bonding step uses electrostatic spraying to electrostatically adhere the powdered bonding compound to the bonding surface of the outsole. The sole structure according to the second aspect of the patent application is followed by a process method, which is a high voltage electric shock type electrostatic spraying or a friction type electrostatic spraying. The sole structure according to claim 1 or 2 or 3, wherein a wet surface treatment or a dry surface treatment step is performed before the spray bonding of the rubber, and the wet surface treatment uses a solvent type. Applying a treatment agent, an aqueous treatment agent or a solventless treatment agent to the bonding surface and causing a change in surface state of the bonding surface, causing the bonding surface to change the surface state, so that the bonding surface has more functional groups Or increase the surface energy. The shoe sole construction process according to claim 1 or 2 or 3, wherein a surface treatment process step is performed before the spray bonding of the rubber compound, and the joint surface of the outsole and the midsole to be combined is applied. A surface treatment process, the surface treatment process is a dry surface treatment process, which is vacuum plasma treatment, normal piezoelectric slurry treatment, ion bombardment mode or photoreactive surface treatment, so that the bonding surface has more functional groups and roughness. Increase or increase surface energy. The sole structure and the process method according to claim 5, wherein the photoreactive surface treatment is electrostatically sprayed on the joint surface of the outsole and the midsole by using a photoreactive surface treatment agent. The light is illuminated. The sole structure and the process method according to claim 5, wherein the vacuum plasma treatment or the normal piezoelectric slurry treatment uses oxygen, nitrogen or argon as the plasma gas source. The sole structure and the process method according to claim 6, wherein the bonding compound is melted into an oven, an infrared ray, or an electrothermal heating. The sole structure and the process method according to claim 7, wherein the bonding compound is melted into an oven, an infrared ray, or an electrothermal heating.