KR101690730B1 - Manufacturing method of light weight last and light weight last using the same - Google Patents

Abstract

The present invention relates to a method of manufacturing a lighter weight last and a lighter weighted last made by the method. More specifically, by inserting a foam filler in the last, the weight of the last can be significantly reduced, , And a foamed filler is partially inserted into the inside of the ordinary last, the effect of reducing the weight is realized, but the deformation of the last in the compression process as a whole can be suppressed as it is in the conventional last, And a lightened last made by this method.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for manufacturing a light weighted last,

The present invention relates to a method of manufacturing a lightweight last which can reduce the weight of the last by inserting the foam pillar into the last and also suppress the deformation of the last during the pressing process of the upper or the sole against the last, ≪ / RTI > which is produced by the method of the present invention.

In general, last is a word for the shape of a shoe, derived from the ancient English word "laest". That is, at the time of manufacturing the shoe, the shoe sole is attached to the lower end of the upper part of the shoe while the upper end of the shoe is covered with the outer surface of the shoe, and then the last is separated, The shoes can be worn on the shoes.

As shown in FIG. 1 (a), poly (ethylene terephthalate) or polyethylene (PE), or the like, may be used as the last material for the chemical shoes. The same synthetic resin material 100 is extruded using an extruder E and cut to an appropriate length and the material 100 'cut to the proper length as shown in FIG. 1 (b) Is formed into a roughly free form L1 by using a free form mold F as shown in Fig. 1 (c) C to cut the preform L1 according to a last dimension chart to complete the final last L2.

However, since the weight of the conventional last is close to 0.9 to 1 kg, it takes much time and manpower for handling such as production, transportation and use, and the last heavy weight of the operator causes injury or equipment damage And the like.

Accordingly, in order to solve the above-mentioned problems, Patent Document 1 has produced an inner boot blank by an injection blow molding method.

However, as in Patent Document 1, since the interior of the shoe last is empty, the shoe lasts for 5 seconds or more in the pressing process of the upper or the sole of the shoe during the shoe manufacturing process (normally, 30 kg / And the shape of the whole last is distorted mainly by the toe portion.

In order to solve this problem, in Patent Document 2, there has been proposed a last method in which a support is provided on the toe portion of the last shoe for internal use as described above. However, since the manufacturing process is very complicated, And it is difficult to suppress the distortion of the last shape only with the support.

In addition, there has been an attempt to reduce the weight by forming a plurality of grooves at one end of the last by a person skilled in the art, rather than a form in which the last part of the last part is empty as described above. However, The shape of the upper part of the shoe is deformed by the groove formed in the last part.

Patent Document 1: Korean Patent Registration No. 10-0725688 entitled "Method for Manufacturing Last for Footwear" Patent Document 2: Korean Patent Registration No. 10-0971416 "Last Inner Bottom and Manufacturing Method Thereof"

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a lighter weight last, in which the weight of the last can be significantly reduced by inserting a foam filler into the last, The present invention provides

In addition, since the foam filler is partly inserted into the inside of the conventional last, the effect of reducing the weight is realized, but the deformation of the last in the compression process as a whole can be suppressed as it is in the conventional last. And to provide a lightened last produced by this method.

The present invention relates to a method for producing a lightened last,

A step (S100) of inserting a foam filler (20) between the first body part material (11) and the second body part material (12) to form a lightweight last material (110);

Molding the lightweight last material 110 into a preform L3 (S200); And

And cutting the formed preform L3 into a final shape L3 (S300). The method for manufacturing the finalized lightweight preform L3 is as follows.

Another aspect of the present invention is to provide a lighter weight last formed by the above-described manufacturing method, wherein the foam pillar 20 is inserted into the body 10.

At this time, the material for the first body part 11 and the material for the second body part 12 may be separately formed from polypropylene, polyethylene, high density polyethylene or low density polyethylene, Or a combination of two or more.

The foam filler 20 may be formed of a material selected from the group consisting of polyethylene, aluminum, ethylene vinyl acetate, polyurethane, polypropylene, high density polyethylene, Polyethylene (low density polyethylene) may be used singly or in combination of two or more thereof, and they are preferably cut into pillars after foaming and extrusion.

The present invention has the effect of significantly reducing the weight of the last by inserting the foam filler into the interior of the last. In addition, since the foam filler is partially inserted into the interior of the last last, It is effective to suppress the deformation of the last during the compression process as it is in the conventional last.

1 is a schematic view illustrating a manufacturing process of a conventional last
FIG. 2 is a flow chart illustrating a method of manufacturing a lightened last according to an embodiment of the present invention.
Fig. 3 is a schematic view illustrating the manufacturing process of Fig. 2
4 is a cross-sectional view illustrating a structure of a lightened last according to an embodiment of the present invention

In order to achieve the above effect, the present invention relates to a method of manufacturing a lighter weight last and a lighter weight last manufactured by the method, and only a part required for understanding the technical structure of the present invention will be described, And will be omitted so as not to obscure the gist of the present invention.

Hereinafter, a method of manufacturing a lightened last according to the present invention and a weighted last manufactured by the method will be described in detail with reference to the accompanying drawings.

FIG. 2 is a process flow diagram illustrating a method of manufacturing a lightened last according to an embodiment of the present invention, FIG. 3 is a schematic view illustrating a manufacturing process of FIG. 2, and FIG. 4 is a cross- Sectional structure showing the structure of the last.

2, forming a lightweight last material 110 (S100), forming a preform L3 (S200), and cutting a final (L4) shape (S300) .

In the step S100, the material for the first body part 11 is first placed on the preform mold F as shown in FIG. 3 (a) The foam filler 20 is placed on the upper surface thereof, and then the material for the second body part 12 is laminated thereon to form the light-weighted last material 110.

That is, the lightweight last material 110 is formed by inserting the foam filler 20 between the material for the first body part 11 and the material for the second body part 12.

The material for the first body part 11 and the material for the second body part 12 may be a common material such as polypropylene, polyethylene, high density polyethylene or low density polyethylene polyethylene, which may be used alone or in combination of two or more, and the present invention is not limited thereto, and various materials capable of forming the last can be applied.

The foam filler 20 may be made of polyethylene, aluminum, ethylene vinyl acetate, polyurethane, polypropylene, high density polyethylene or low density polyethylene (low density polyethylene) may be used alone or in combination of two or more kinds. However, the present invention is not limited thereto and various materials capable of forming a foam can be applied.

On the other hand, in the case of the last, it is preferable to use the same material as the material for the first body part 11 and the material for the second body part 12, since it is recovered almost 100% and is crushed and recycled. However, And it is possible to apply various materials even if they are different kinds of materials.

3, the above-described foam pellets 20 are formed by foaming and extruding the above materials through a conventional foaming and extruding machine E and then cutting them into pillars .

Since the foaming and extruding machine E is well known in the art, detailed description thereof will be omitted. The production conditions such as the temperature and the speed of foaming and extrusion, the content of the foaming agent or other additive composition, And may be very variable depending on the size and application environment of the apparatus. That is, the present invention is not particularly limited to the production conditions for producing the foam filler 20 and other compositions including the foaming agent, and various known conditions and compositions can be applied under the premise that the weight reduction effect can be obtained.

The step S200 is a step of molding the lightweight last material 110 into a preform L3 and the lightweight last material 110 is preform L3 as shown in FIG. , And is molded into a roughly last preform (L3) by using a conventional preform mold (F).

At this time, although the molding temperature and pressure of the preform mold F may vary depending on the type of resin and the like, it is preferable that the molding temperature is generally 30 to 50 kg / cm 2 at 100 to 150 ° C. When the temperature and the pressure range are out of the range , And the preform (L3) may not be properly formed.

3, the preform L3 is cut to form the final last L4, as shown in FIG. 3 (c). In step S300, the preform L3 is cut into a final shape L4, The final last L4 is manufactured by cutting the preform L3 using a conventional last cutter C (see '(c)' in FIG. 1).

4, since the foam pillar 20 is inserted into the body part 10, the final last body L4 manufactured by the above-described manufacturing method can be used only with the conventional body part 10 Since the foam filler 20 is partly inserted into the interior of the conventional last, the effect of reducing the weight is realized, but the deformation of the last during the compression process as a whole is generally It can be suppressed as it is in the last time.

The present invention is not limited to the above-described embodiments and the accompanying drawings, and various changes, modifications and variations may be made without departing from the scope of the present invention. Will be apparent to those of ordinary skill in the art.

10: Body part 20: Foam pillar
110: Lightweight last material 11: First body material
12: Material for second body part L3: Preform
L4: Last E: Foaming and extruding machine
C: Last cutting machine F: Preform mold

Claims (4)

In the method for producing a lightened last,
A step (S100) of inserting a foam filler (20) between the first body part material (11) and the second body part material (12) to form a lightweight last material (110);
Molding the lightweight last material 110 into a preform L3 (S200); And
And cutting the formed preform L3 into a final shape L3 (S300)
The material for the first body part 11 and the material for the second body part 12 may be used alone or in combination of two or more of polypropylene, polyethylene, high density polyethylene or low density polyethylene. Or more,
The foam filler 20 may be formed of a material selected from the group consisting of polyethylene, aluminum, ethylene vinyl acetate, polyurethane, polypropylene, high density polyethylene, or low density polyethylene low density polyethylene), or a combination of two or more thereof, which is cut into pillars after foaming and extrusion.
delete delete 6. A process for producing a polyurethane foam, which is produced by the process according to claim 1,
Characterized in that a foam filler (20) is inserted into the body part (10).

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