JPH04357901A - Production of injection molded shoes - Google Patents

Abstract

PURPOSE:To produce the injection molded shoes having excellent fashionability and high-grade handmade feel by injection molding the shoes in the state of surely holding fine bodies, such as jute tapes, in the desired positions on the forming surface of a bottom mold. CONSTITUTION:This production process consists of a 1st injection stage for forming the 1st part 7 of the shoe sole mounted with the fine bodies 2 on the outer periphery of the shoe sole by injecting a shoe sole material into the cavity formed of the dummy last mold 1 tentatively mounted with the fine bodies 2 on the side faces corresponding to the outer periphery of the shoe sole and the bottom molds 5, 6 and a 2nd injection stage for injecting the shoe sole material into the part (2nd part 10 of the shoe sole) of the part exclusive of the shoe sole part of the shoe sole formed by the above-mentioned stage and molding the entire part of the shoe sole. The dummy last mold 1 provided with grooves 11 for tentative mounting to fit the longitudinal edges of the fine bodies 2 or needle-like projections 12 for tentative mounting to pierce and stop the fine bodies so as to face outward and downward is used as well.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for manufacturing injection molded shoes in which a thin body such as jute tape is integrally formed on the outer periphery of the shoe sole (hexing tape portion), with a high level of safety. The present invention also relates to the manufacturing method which allows the thin body to be integrated with the sole of the shoe with high work efficiency.

0002

[Prior Art and Problems to be Solved by the Invention] Shoes need to be comfortable to wear and have high durability, but they also need to have a variety of designs and be fashionable. Product value improves. For this reason, some hand-made shoes on the market have thin objects such as jute tape attached to the outer periphery of the sole to improve fashionability and to strengthen the protection of the outer periphery of the sole. In addition, with regard to injection molded shoes, there is a market demand for shoes with a hand-applied finish, and we also provide a technology that creates a texture similar to that of a hand-applied finish by providing a thin body like the one above on the outer periphery of the sole. has been done.

However, a method is known in which jute tape, patterned tape, etc. is pasted on the outer periphery of the shoe sole with adhesive after injection molding, but this method requires a lot of effort and
Another disadvantage is that the tape easily peels off when worn. Alternatively, a concavo-convex design imitating a woven fabric such as jute tape is simply formed on the surface of the side mold that forms the edge of the sole, and the finished product looks like a piece of jute tape pasted on the edge. Efforts have also been made to make it look like this. Although this method does not have the disadvantage that the jute tape or the like peels off, it does have the disadvantage that it cannot express the feel of natural jute or the like.

Furthermore, in order to eliminate the above-mentioned disadvantages, jute tape or the like is placed in advance along the surface that forms the outer periphery of the sole in the side mold during injection molding, and in this state, the sole material is A method of ejecting is also being considered. In this method, on the production line, workers must quickly and accurately place jute tape, etc., along the desired part of the side mold (the surface that forms the outer periphery of the sole), but in reality, This work is extremely difficult, and even if jute tape, etc. could be placed accurately at the desired location within the side mold, the jute tape, etc. would only be attached to the desired location within the side mold, and the injection process would be delayed. There is also the problem that during molding, the sole material gets between the side mold and jute tape, etc., making it impossible to manufacture high-quality shoes. Furthermore, since the work must be carried out under conditions in which the mold is opened and closed, there is a problem in that it is extremely dangerous.

[0005]

[Object of the Invention] The present invention was proposed in order to solve the above-mentioned problems, etc., and it is possible to securely place a thin object such as jute tape at a desired position on the molding surface of a bottom mold. By injection molding the shoes in a held state, the aim is to manufacture high-quality, hand-made injection molded shoes with excellent fashion sense.

[0006]

[Means for Solving the Problems] In order to achieve the above object, in the method for manufacturing injection molded shoes of the present invention, thin bodies are disguised on the side mold, the bottom mold, and the side surface corresponding to the outer periphery of the sole. By injecting sole material into the cavity formed by the attached dummy last mold, a sole portion (including at least the outer edge portion of the shoe sole) where the thin body is attached to the outer periphery of the shoe sole ( (Hereinafter, for convenience, this will be referred to as the "first part of the sole") (hereinafter, for convenience, this will be referred to as the "first injection process"); forming the entire sole by injecting a sole material into a portion (hereinafter referred to as the "second injection step" for convenience) with a sole material; It is characterized by:

[0007] Furthermore, as the above dummy last mold,
A temporary attachment groove for fitting the longitudinal edge of the thin body is provided in the part constituting the outer edge of the sole, and furthermore, as the dummy last mold, the part where the inner surface of the thin body abuts,
It is also characterized in that a needle-like protrusion for temporary attachment that pierces the thin body is provided outwardly and downwardly. Note that in the present invention, after forming the first part of the sole in the first injection process, the second part of the sole may be formed in the second injection process;

[Effect] and

(Refer to [Example]), the second injection process may be composed of a plurality of processes, and when it is composed of a plurality of processes, each process may be arranged before and after the first injection process.

[0008]

[Operation] In the first step in the method for manufacturing injection molded shoes of the present invention, the side mold, the bottom mold, and the dummy last mold to which a thin body such as jute tape is temporarily attached are closed, and these molds are A first portion of the sole is formed by injecting sole material into the cavity formed by. At this time, the strip is firmly bonded to the injected sole material and integrated with the first part of the sole. In this case, the thin body is temporarily attached to the side surface of the dummy last mold corresponding to the outer periphery of the shoe sole, but an appropriate adhesive means such as double-sided tape can be used as the attachment method. In addition, a groove for temporary attachment may be provided in the part of the dummy last mold that constitutes the outer edge of the sole of the shoe, or a groove for temporary attachment may be provided in which the thin body is inserted into the part where the thin body contacts. A needle-like projection may be provided.

[0009] Now, the side mold is opened and the dummy last mold is removed. As described above, the thin body is firmly attached to the side surface of the sole and is configured to be easily removed from the dummy last mold, so that the first portion of the sole is left behind on the molding surface of the bottom mold. The first part of the sole formed in this way forms a part of the sole and does not constitute the entire sole, but the part other than the first part of the sole is By injection molding the shoe sole integrally with the first part of the shoe sole in the process or in a part of the second injection process, a shoe sole with the thin body firmly attached to the outer periphery is formed. for example,
When the injection process consists of two steps, the first part of the sole is first formed in the first step. Next, in the second process, the last mold with the hanging cover suspended, and the side mold,
The entire sole is formed by closing the bottom mold on which the first part of the sole is placed and injecting sole material into the cavity created thereby.

[0010] Furthermore, when the second injection process consists of two processes, first, a part of the second part of the sole is formed by a part of the process of the second injection process, and then the shoe is formed by the first injection process. It is also possible to construct the first part of the sole and then form the remainder of the second part of the sole by the remaining steps of the second injection step. In this way, high fashion injection molded shoes with strips firmly attached to the edges can be produced efficiently and without dangerous work steps.

[0011]

[Embodiment] An embodiment of the method for manufacturing injection molded shoes according to the present invention will be described below. FIG. 1 is an explanatory diagram showing an example of a dummy last mold used in the present invention, and FIG. 1 (A) shows a dummy last mold 1 to which a thin body (jute tape 2 in FIG. A bottom view, (B) is a cutaway sectional view of the mold 1 in the direction of arrow α in (A), and (C) is a side view of the mold 1 without the jute tape 2 attached. It is. Also, Figure 2
1(A) to 1(C) are diagrams showing how injection molded shoes to which jute tape 2 is attached are manufactured using the dummy last mold 1 shown in FIGS. 1(A) to 1(C). FIG. , side mold 5, bottom mold 6
jute tape 2 in the cavity formed by
This figure shows how the first part 7 of the sole (shown with diagonal lines) to which the first part 7 of the sole is attached is formed, and (B) shows that after forming the first part 7 of the sole, the dummy last mold 1 is removed. By closing the side mold 5, the bottom mold 6, and the last mold 9 in which the shoe cover 8 is suspended, the second sole of the shoe is formed.
It is a figure which shows how a part is formed.

The dummy last mold 1 shown in FIGS. 1(A) to 1(C) has a large number of grooves (
In the same figure, a flange portion 3 which can come into contact with the longitudinal edge of the jute tape 2 is provided on the upper edge of the side surface. The dummy last mold 1 shown in the figure is provided with protrusions 4a and 4b on the heel and the stepping portion, the bottom surfaces of which abut against the bottom mold 6 (see FIG. 2(A)). The jute tape 2 is made relatively firmly so as not to fall off before the dummy last mold 1, the side mold 5 shown in FIGS. 2(A) and 2(B), and the bottom mold 6 are closed. When each mold is opened, the jute tape 2 is loosely attached to the dummy last mold 1 so that it can be easily separated from the dummy last mold and left behind in the bottom mold 6 together with the first part 7 of the sole. There is a need.

For example, the jute tape 2 may be a ring-shaped piece with some elasticity and attached around the dummy last mold 1 as it is for temporary attachment. A temporary attachment means such as an adhesive may be provided, and the jute tape 2 may be wrapped annularly around the entire periphery of the dummy last mold 1. Also, apply an amount of adhesive to several places on the inner surface of the jute tape 2 to allow temporary attachment to the dummy last mold 1, or paste an extra-thin double-sided adhesive tape along the circumference of the inner surface of the jute tape 2. By keeping the jute tape 2 in place, the jute tape 2 may be temporarily attached. In addition, when using the above-mentioned adhesive or adhesive tape, a material that undergoes thermal decomposition by the heat of the injected shoe sole material (first injection material) can also be used as the material for the adhesive. By doing the above, the jute tape 2 will not fall off from the dummy last mold 1 when each of the above molds is closed, and will be easily removed from the dummy last mold when each of the above molds is opened. Appropriate adhesive strength can be obtained so that the shoe sole is separated and left on the bottom mold 6 together with the first part 7 of the sole.

Furthermore, the jute tape 2 does not necessarily need to cover the entire circumference of the dummy last mold 1, but may be attached to a part of the circumference of the dummy last mold 1 as long as it does not fall off from the last mold 1. There may be. For example, in the dummy last mold 1 shown in FIG. 3, the outer peripheral portion 4c to which the jute tape 2 is not attached is processed into a shape that protrudes by the thickness of the jute tape 2. The shape of the part of the dummy last mold 1 to which the jute tape 2 is attached varies, but the cavity formed by the molding surface of the dummy last mold 1, the molding surface of the bottom mold 6, and the inner surface of the jute tape 2 Any shape may be used as long as the cavity forms a portion (sole first portion 7) that holds the jute tape 2 when the sole material is injected.

The manufacturing process of injection molded shoes using the mold shown in FIGS. 1(A) to 1(C) will be described below with reference to FIGS. 2(A) and 2(B). First, in FIG. 2(A), a shoe sole material (first injection material) is injected into the cavity formed by the molds 1, 5, and 6, and the shoe sole material (first injection material) is injected into the shoe sole with the jute tape 2 attached to the outer periphery of the shoe sole. 1 part 7 is formed. Here, the side mold 5 is opened and the dummy last mold 1 is lifted upward. At this time, the jute tape 2 is firmly attached to the first part 7 of the sole, and is attached to the first part 7 of the sole on the bottom mold 6. Retained. In FIG. 2(A), the many grooves G formed on the side surface of the dummy last mold 1 are tapered upward, so that when the dummy last mold 1 is removed, the dummy last mold 1 and the first part 7 of the sole The withdrawal will be smooth.

After that, the last mold 9 with the shoe cover 8 suspended therein is closed as shown in FIG. 2(B), and the sole material (
A second injection material) is injected to form the second part 10 of the sole. At this time, since the first part 7 of the sole firmly holds the jute tape 2, close contact between the jute tape 2 and the side mold 5 is ensured. Therefore, there is a second
Although the injection material hardly enters, for example, in order to further strengthen the above-mentioned adhesion, some of the molded parts formed by the grooves G in the first part 7 of the sole when the mold is closed are shown in FIG. As shown in FIG. 2, the shape may be such that it is pressed toward the side mold 5 by the last mold 9.

FIG. 5A is a partial sectional view showing an example of the sole of an injection molded shoe manufactured as described above. The present invention provides that the attachment of the jute tape 2 to the sole of the shoe is carried out together with the injection molding of the first and second injection materials, and
Since the jute tape 2 is made of injection material, peeling of the jute tape 2 is less likely to occur. Furthermore, by appropriately processing the lower end of the side mold 5 in contact with the jute tape 2, as shown in FIG. 5(B).
As shown in the β part of , the first injection material is jute tape 2
The first portion of the sole may also be formed to cover the lower end of the shoe. This further strengthens the prevention of peeling of the jute tape 2 due to wear and the like.

FIG. 6 shows, as the dummy last mold 1,
FIG. 2 is a diagram showing a method of manufacturing injection molded shoes when using a temporary attachment groove 11 for fitting the longitudinal edge of jute tape 2 into a region constituting the outer edge of the sole; A) is dummy last mold 1 and side mold 5
The first part 7 of the sole is formed by closing the bottom mold 6 and the bottom mold 6. FIG. FIG. 3 is a diagram showing a case where the second part 10 of the sole is formed by closing the molds. Note that the contact portion of the molding surface of the side mold 5 with the jute tape 2 shown in FIGS. Since the dummy last mold 1 as shown in FIG. 6(A) is provided with a groove 11 for temporary attachment, jute tape 2 (usually a tape slightly thicker than the width of the groove 11 is used) can be attached very easily. In addition to being able to attach the jute tape 2, there is no possibility that the jute tape 2 will be misaligned during the process from attaching the jute tape 2 to closing the dummy last mold 1, side mold 5, and bottom mold 6, or when injecting the first injection material. There is no.

FIG. 7 is a diagram showing a dummy last mold 1 in which a needle-like protrusion 12 for temporarily attaching the jute tape 2 is provided outwardly and downwardly at a portion where the inner surface of the jute tape 2 contacts. Dummy last mold 1 in the same figure
Even when using jute tape 2, it can be attached to dummy last mold 1 very easily, and from the time when jute tape 2 is attached to the closing of dummy last mold 1, side mold 5, and bottom mold 6, Or the first
When injection material is injected, jute tape 2 does not shift. As described above, after passing through the first injection process, the second injection process is entered. That is, in the first injection process, the first part 7 of the sole to which the jute tape 2 is attached is formed, and in the next injection process, the last mold 9 on which the shoe cover 8 is suspended, the side mold 5, and the bottom mold 6 are formed. The second part 10 of the sole is formed by closing the mold.

[0020] The first part 7 of the sole, which is formed by attaching the jute tape 2 to the first part 7 of the sole, is formed during the injection process before the first injection process (this injection process is the second injection process). 1A to 1C can be formed after forming a part of the second part 10 of the sole. For example, first, a part of the second sole portion 10 is molded by first injection molding using a dummy last mold (not shown) different from the dummy last mold 1 used in the present invention, and then a part of the second part 10 of the sole is molded. In the process, the first part 7 of the sole to which the jute tape 2 is attached is molded using the dummy last mold 1 with the jute tape 2 attached to the edge, and then the remaining part of the second part 10 of the sole is molded. Injection molded shoes may be manufactured by molding. In addition, the first part 7 of the sole
After the injection process of the first part 7 of the sole to which the jute tape 2 is attached, the last mold 9 in which the cover 8 is suspended, the side mold 5, and the bottom mold 6 are closed to form the sole part 7. A second injection process is performed to form two parts, but this second injection process may be performed in multiple stages. For example, the first part 7 of the sole is injection molded using a dummy last mold 1 in which jute tape 2 is attached to the first part 7 of the sole, and then the dummy last mold 1 used in the present invention is molded.
A part of the second part of the sole is injection molded using a dummy last mold (not shown) different from the above, and then the last mold 9, side mold 5, and bottom mold 5 are closed to make the shoe. The remaining bottom portion of the second bottom portion may be injection molded.

[0021]

[Effects of the Invention] In the present invention, a thin body such as jute tape is temporarily attached to a dummy last mold, and the sole portion to which the thin body is attached is injection molded on the molding surface of the bottom mold. It was decided that the unformed portions would be formed using another injection process. Therefore, compared to the conventional method of attaching the thin body after sole molding, the thin body is attached to the sole edge by injection molding integrally with the injection material. It can be provided in the section. In addition, compared to the conventional method of attaching a thin body to the molding surface of a side mold before injection, it is only necessary to attach the thin body to the dummy last mold, which simplifies work on the production line and enables the design of a predetermined design. Since the strips can be attached without variations in position, it is possible to manufacture shoe soles with stable quality strips, and workers can be avoided from dangers caused by mechanical movement of the mold. Furthermore, since the sole is completed with the thin body held in a part of the sole, there is a very low possibility that the injection material will enter between the side mold and the thin body, and the surface will not be contaminated. In addition, an injection molded shoe can be formed having the elongated body firmly attached to the edge of the sole.

[0022] In the present invention, the dummy last mold is further provided with a temporary attachment groove into which the thin body can be fitted or a temporary attachment needle-like protrusion for fixing the thin body. therefore,
Not only can the thin body be attached to the dummy last mold accurately, reliably, and easily, but after attachment,
It is possible to prevent the thin body from falling off during the process of closing the dummy last mold, side mold, etc., and also prevent the thin body from shifting during injection. In this way, the present invention makes it possible to manufacture injection molded shoes with an extremely high hand-glued texture, and to efficiently manufacture injection molded shoes with a high degree of safety and high fashionability with a wide degree of freedom in design. be able to.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a dummy last mold used in the manufacturing method of the present invention, in which (A) is a bottom view when jute tape is temporarily attached, and (B) is a bottom view ( A
) is a sectional view taken in the direction of arrow α, and (C) is a side view when no jute tape is attached.

FIG. 2 is a diagram showing an example of carrying out the manufacturing method of the present invention using the dummy last mold shown in FIGS. 1(A) to (C), and FIG. The same figure (B) is a diagram showing how to mold the second part of the sole.

FIG. 3: FIGS. 1(A) to (C) used in the manufacturing method of the present invention.
) is a diagram showing a dummy last mold different from that shown in FIG.

FIG. 4 is a diagram showing another embodiment in which the second portion of the sole is molded with jute tape pressed against the side mold.

FIG. 5 shows an example of a shoe sole edge produced by the manufacturing method of the present invention; FIG. 5(A) shows a shoe sole edge produced by the apparatus shown in FIG. 2, and FIG. It is a figure which shows the case where the bottom 1st part is shape|molded so that the lower part of jute tape may be covered.

FIG. 6 is a diagram showing how to carry out the manufacturing method of the present invention using a dummy last mold provided with a temporary attachment groove for fitting the longitudinal edge of the thin body into a portion constituting the outer edge of the shoe sole; FIGS. 3A and 3B are diagrams showing other examples, in which FIG. 1A shows how the first part of the sole is molded, and FIG. 7B shows how the second part of the sole is molded.

FIG. 7 is a diagram showing a dummy last mold used in the manufacturing method of the present invention, in which a needle-like protrusion for temporarily attaching the thin body is provided outwardly and downwardly at a portion where the inner surface of the thin body contacts. .

[Explanation of symbols]

1 Dummy last mold 2 Jute tape 3 Flange part 5 Side mold 6 Bottom mold 7 First part of sole 8. Cover 9 Last mold 10 Second part of sole 11 Temporary mounting groove 12. Needle-like protrusion for temporary attachment

Claims (3)

[Claims] Claim 1: By injecting sole material into a cavity formed by a side mold, a bottom mold, and a dummy last mold in which a thin body is temporarily attached to the side surface corresponding to the outer periphery of the sole, a step of forming a shoe sole portion including at least an outer edge portion of the shoe sole, in which the thin body is attached to the outer periphery of the shoe sole, and a portion of the shoe sole other than the sole portion formed by the above step; A method for manufacturing an injection molded shoe, comprising the step of: forming the entire sole by injecting a sole material into the shoe. 2. The dummy last mold used is a dummy last mold that is provided with a temporary attachment groove in which the longitudinal edge of the thin body is fitted in a portion constituting the outer edge of the shoe sole. A method of manufacturing injection molded shoes as described. 3. A claim characterized in that the dummy last mold is provided with needle-like protrusions facing outward and downward for temporary attachment to pierce the thin body at a portion where the inner surface of the thin body abuts. 2. The method for manufacturing injection molded shoes according to 1 and 2.