JPH0644882B2 - Shoe manufacturing - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing shoes, and in particular, a method for manufacturing shoes having multi-colored and multifunctional soles even though the soles made by calendar rolling are used. Regarding

<Prior art> A method for molding a rubber shoe sole adhered to the underside of a shoe is also rolled by a calender machine to obtain a sheet having an appropriate uneven design, and a method for cutting it out, a press machine. There is a method in which molding and vulcanization are simultaneously performed by using a mold.

<Problems to be Solved by the Invention> The former method is suitable for mass production and is easy to automate,
As it is composed of a single material, it is not suitable for high-end shoe soles because it is not possible to make certain parts of the shoe sole different in color or impart functionality using different physical properties. Met.

In view of the above circumstances, the present invention has a material having a desired physical property that is different from a specific part having a different color even in a shoe sole formed by a calender machine to improve the appearance or a part requiring a specific physical property. It is intended to manufacture a shoe by molding a shoe sole using.

<Means for Solving the Problems> The present invention is to cut an unvulcanized rubber sheet having an appropriate thickness into a substantially sole shape, heat it to an appropriate temperature, wipe the upper surface with a solvent, and hang it in the last undercover. Abutting the upper surface, and fitting it into a plastic mold on which an unvulcanized rubber piece of a different color and / or foreign material whose upper surface has been wiped with a solvent is placed at an appropriate place of the shoe sole forming cavity, depending on the part. Apply a rubber or plastic sheet with different impact resilience to the lower surface of the plastic mold to press the whole, complete the molding of the shoe sole and pressure bonding to the lower surface of the cover, remove it from the plastic mold, and then heat the shoe sole with hot air. The shoe is manufactured by vulcanizing.

Here, the rubber or plastic sheet is configured such that the portion contacting the toe portion of the plastic mold has a smaller impact resilience than other portions, or the portion contacting the toe portion and the heel portion of the plastic mold is The impact resilience is smaller than that of other portions.

The unvulcanized rubber sheet is heated to a temperature at which it becomes plastic, for example, 60 to 90 ° C., during a molding process in a plastic mold. To the solvent for wiping the upper surface of the unvulcanized rubber sheet, a small amount of a rubber kneaded material containing a required compounding agent for imparting adhesiveness and / or a tackifier such as coumarone resin is added. The plastic mold is made of polyurethane, epoxy resin, natural or synthetic rubber, etc., and has a hardness of Hs60 to 100 (according to JIS K6301. The same applies below), and the surface of the design may be deep or complex. In this case, a release agent such as silicone may be applied beforehand. This will make the work easier.

As the plastic mold, generally, polyurethane is often used because it is easy to transfer the design surface as it is from the actual product by a casting method or the like. In actual use, the plastic mold must be kept at 50 to 100 ° C to help the plasticity of the unvulcanized rubber sheet to be molded.
Since it is heated to 60-90 ℃, it is not necessary to continue heating. The rubber or plastic sheet applied to the lower surface of the plastic mold is natural rubber, synthetic rubber, polyurethane,
A foam such as EVA is used, and one having a thickness of 30 mm or more is preferable.

In this rubber or plastic sheet, the portion contacting the toe portion and the heel portion of the plastic mold have a hardness of 20 to 40 ° (according to an Asker sponge hardness meter.
The same applies hereinafter) is the hardness of the other part, that is, the central part is 40 ~
90 ° is used. The upper layer portion of the rubber or plastic sheet that comes into contact with the toe portion and the heel portion has a hardness of 20 to 40 ° and has a hardness of about 10 mm. 20 ~ 90 °
It may be designed to have a size of at least mm and a total of at least 30 mm. The plastic mold for molding the shoe sole and adhering it to the underside of the shoe cover and the pressing of the rubber or plastic sheet against the underside of the shoe cover are 10 to 50 kg / cm ² (gauge pressure for children shoes, for example, with a length of 15.0 cm). , The same below), adult shoes, for example, if the length is 25.0 cm, 20-80 kg / cm ² is enough.

The pressing time may be 2 seconds or more at the above pressure.

<Working> In carrying out the present invention, for example, the toe part and / or the heel part have a color different from that of the entire sole and physical properties such as abrasion resistance and slip resistance at appropriate portions of the cavity for forming the sole. An unvulcanized rubber sheet of an appropriate shape is placed, and an unvulcanized rubber sheet of approximately shoe bottom shape with an appropriate thickness is placed on the upper surface of the shoe, so that the shoe is manufactured. Has the desired color and physical properties, and it is possible to obtain high-quality shoes excellent in appearance and functionality. When the shoe sole made of unvulcanized rubber, which is in contact with the lower surface of the suspension suspended in the last, is pressed by the plastic mold, the mold easily follows the entire radius of the lower surface of the shoe due to its flexibility. The desired appearance of the sole can be imparted, and the individual irregularity design of the mold is not deformed, and the desired irregularity design can be reliably imparted to the sole of the unvulcanized rubber.

In addition, when pressing, a rubber or plastic sheet whose tip and / or heel part applied to the lower surface of the mold has a smaller impact resilience than other parts is also pressed at the same time as wrapping the mold, so that the tip of the tip with large radius is large. And / or the pressing force on the heel part is smaller than that on other parts, and it is possible to prevent the uneven design of that part from collapsing, and at that time, the upper edge of the unvulcanized rubber shoe sole can be surely pressed against the underside of the hem. , It is possible to firmly and securely bond.

<Examples> Compound AB Solution-polymerized styrene-butadiene copolymer rubber 50 50 Emulsion-polymerized 30 30 Natural rubber 20 20 Sulfur yellow 2 2 Zinc white 4 4 Stearic acid 11 1 Vulcanization accelerator 1.8 1.8 Dibenzothiazyl disulfide addition Sulfurization accelerator 0.2 0.2 Tetramethyl thiuram monosulfide White carbon 45 45 Polyethylene glycol 2.5 2.5 Calcium carbonate 45 45 Spindle oil 10 10 Coumaron resin 5 5 Titanium oxide 5-Ultramarine-3 According to the above formulation table, the formulation A and B are in a weight ratio. Weigh by
Kneading with a roll machine to make a calender machine, the former is 4 to 7 mm thick, the latter is seated to a thickness of 1 to 2 mm and the blade type is used to make the former into a sole shape and the latter to a circle with a diameter of 20 mm. And heat them to 80 ° C and heat their upper surface to 1% of the kneaded product.
Wipe with dissolved triol.

Natural rubber 70 Polybutadiene 30 Sulfur yellow 2 Zinc white 3 Stearic acid 1 White carbon 40 Diethylene glycol 4 Vulcanization accelerator 1.5 Dibenzothiazyl disulfide Vulcanization accelerator 0.1 Tetramethylthiuram monosulfide Weighed by weight ratio according to the above recipe Kneading with a roll machine, sheeting with a calender machine to a thickness of 1 to 2 mm, cutting with a blade die into a semicircular shape with a diameter of 40 mm, heating to 80 ° C., and using triol containing 1% of the kneaded material dissolved on the upper surface wipe.

The circular sheet and the semicircular sheet shown in the perspective view of FIG. 1 are made of a polyurethane mold (1) (hardness Hs 80 ° C., temperature 80 ° C.) with circular depressions (2) and heels of the toe tread. Fit in the semi-circular recess (3). As shown in the perspective view of FIG. 2, this polyurethane mold (1) has a hardness of 70 ° at the central portion (4),
Place it on a foam sheet (thickness 30 mm) with a hardness of 30 ° in the upper rear part (5) and a hardness of 40 ° in the upper front part (6), and mold it.
Fit the shoe sole-shaped unvulcanized rubber sheet (not shown) into the hollow part (7) of (1), and attach the last (9) (size 25.0 mm) with the armor cover (8) suspended. Combine.

The whole combined in this way is 60kg / cm ² and 3 up and down.
Press for 2 seconds to press the unvulcanized sole into contact with the underside of the cover (8).
This shoe was put together with the last (9) in an indirect vulcanizer having an atmosphere of 125 ° C. and 2.5 kg / cm ² for 40 minutes to obtain the initial target shoe.

<Effect> Despite the use of a calendar machine in the shoe sole molding process,
You can easily obtain a shoe that has a shoe bottom that has multiple color tones and has wear-resistant members at the parts that need to be worn such as the heel, and that is attached to the lower surface of the scabbard, which helps to increase the quality of the shoe. I was able to.

[Brief description of drawings]

1 and 2 are perspective views showing the essential parts of the method for manufacturing shoes according to the present invention. (1) …… plastic mold, (4) …… rubber or plastic sheet, (7) …… cavity, (8) …… cover, (9) ……
last.

Claims (3)

[Claims] 1. An unvulcanized rubber sheet having an appropriate thickness is cut into a substantially shoe sole shape, heated to an appropriate temperature, wiped with solvent to hang the last, and the upper surface is brought into contact with the lower surface, A rubber or plastic sheet with a different impact resilience depending on the part is fitted into a plastic mold in which an unvulcanized rubber part of different color and / or foreign substance is placed at an appropriate place of the cavity for forming the shoe sole, and the bottom surface of the plastic mold A method for manufacturing a shoe, characterized in that the shoe sole is pressed, and the shoe sole is molded and pressure-bonded to the lower surface of the shoe, and then the shoe sole is removed from the plastic mold and then the shoe sole is vulcanized by hot air. 2. The rubber or plastic sheet, wherein a portion of the plastic mold that abuts on a toe portion has a smaller impact resilience than other portions.
A method for manufacturing a shoe according to claim 1. 3. The shoe according to claim 1, wherein, in the rubber or plastic sheet, a portion of the plastic mold that comes into contact with a toe portion and a heel portion has a smaller impact resilience than other portions. Manufacturing method.