JP2018050642A - Upper material and shoe with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an upper material that is made of knit fabric which is knitted like a sock without sewing, and that has superior adhesiveness with a sole which is formed by injection process, without using an adhesive or a surface treatment agent, and to provide a shoe with this upper material, with less appearance defect, and with excellent wearing comfort.SOLUTION: The upper material is characterized in that it is knitted like a sock without sewing and that, at least in a part of the upper material in contact with a sole, it is composed of a knit density with a course 8-30 pieces/inch and a wale 8-30 pieces/inch.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an upper material knitted in a sock shape without sewing and a shoe provided with the upper material.

  In general, a shoe is composed of an upper material that covers the instep and a sole that absorbs impact upon landing. The upper material is a sock-like shape (for example, forear, outer side, inner shell) prepared by cutting or die cutting various materials, preparing multiple parts, and stitching each part together or bonding them with an adhesive. Side, ridge, bottom). In addition, since it is necessary to adjust the size of the upper material for each size, if there are a large number of parts forming the upper material, the production process becomes very complicated and time-consuming, and the yield also deteriorates and the cutting waste is reduced. Since the amount of waste increased due to the occurrence of this, the cost was high.

  For such a problem, there has been proposed an upper material formed three-dimensionally in a sock shape without sewing using a knitting machine or the like (Patent Documents 1 and 2). In the case of the upper material, the material is only knitting yarns, which can be formed into a sock-like shape in the knitting process, so that the sewing process is unnecessary, the labor and time for creating the upper material can be greatly reduced, and cutting waste is not generated. In addition, the design can be improved depending on the color, type, and knitting method of the knitting yarn, and there is no need to worry about the design limit due to the number of parts.

  On the other hand, there are mainly two methods for forming a sole on the upper material. There are generally referred to as a handmade manufacturing method, a method in which a previously prepared sole is bonded to the upper bottom portion with an adhesive, and an injection manufacturing method in which the sole is formed by injection molding and is simultaneously bonded to the upper material bottom portion.

  By the way, as a method of forming the sole on the upper material knitted in a sock shape without sewing, a handmade manufacturing method is mainly employed. For example, Patent Documents 1 and 2 disclose that a handmade manufacturing method can be used, but the injection manufacturing method is not particularly described. This is because, when surface treatment such as application of an adhesive or primer treatment is performed on the upper material made of knitted fabric, the texture of the knitted fabric is often impaired by these treatment agents. Therefore, it is considered that a handmade manufacturing method that can easily adjust the application range of the treatment agent is suitable.

  On the other hand, in the injection manufacturing method, from the formation of the sole to the adhesion with the upper material can be performed in a single step, the manufacturing process is generally fewer than the handmade manufacturing method, but depending on the material constituting the upper material, Deviations, wrinkles, and hang-ups when suspended in the last mold occur, which affects the molding of the sole and tends to appear as appearance defects such as excessive penetration of the injection resin. In addition, when knitted fabric is used as the upper material, the injection resin easily penetrates into the gaps between the knitting yarns, so it is easy to adhere to the injection resin. May cause functional problems, such as foot contact, etc. may occur when wearing shoes. In addition, in order to improve the adhesion between the upper material and the sole, a surface treatment such as an adhesive or a primer treatment is required separately, which may cause problems such as loss of productivity and texture of the material.

  Under these circumstances, up to now, many studies have been made on upper materials suitable for shoes, focusing on the types and stitches of knitting yarns, but what has been studied on upper materials suitable for injection manufacturing methods I couldn't see it.

JP 2007-236612 A WO2013 / 108506

  Therefore, the present invention consists of a knitted fabric knitted in a sock shape without sewing, and an upper material with good adhesion to a sole formed by an injection manufacturing method without using a surface treatment such as an adhesive or a primer treatment. Another object is to provide a shoe comprising the upper material and having a low appearance defect and excellent comfort.

  In order to solve the above-mentioned problems, the present inventors studied by focusing on the fact that the ease of penetration of the injection resin (entanglement) can be controlled by adjusting the knitting density of the knitted fabric. By using the knitted fabric, it was possible to achieve good adhesion with the injection resin without using an adhesive, a surface treatment agent, or the like, and the present invention was achieved.

That is, the present invention is an upper material knitted in a sock-like shape without sewing, and the knitting density is 8-30 pcs / inch for the course and 8-30 wales / inch for the wales at least at the position where the sole contacts. It is characterized by being.

  If a knitted fabric having a specific knitting density is used, good adhesion can be obtained when the sole is formed by the injection manufacturing method.

  In addition, the upper material of the present invention preferably has an aspect in which an auxiliary bonding yarn is knitted at a position where the sole contacts.

  Thus, the adhesiveness of the knitted fabric in which the auxiliary bonding yarn is knitted further improves. In particular, when a heat-meltable yarn is used as the auxiliary bonding yarn, the effect is remarkable.

  In addition, the shoe having a sole formed by the injection method on the upper material of the present invention has good adhesion between the upper material and the sole because the injection resin soaks moderately into the bottom or periphery of the upper material. In addition, excessive penetration of the resin into the upper material is suppressed, the appearance is good, and the comfort is also excellent.

  The present invention is an upper material knitted in a sock-like shape without sewing, and at least a portion where the sole is in contact is knitted at a specific knitting density, so that it is not necessary to use a surface treatment such as an adhesive or a primer treatment. Adhesiveness with the sole formed by the injection manufacturing method becomes good.

  In addition, if the upper material is knitted sock-like without sewing, and the part where the sole contacts is knitted at a specific knitting density, and the auxiliary auxiliary yarn is knitted at the same time, Without the process, the adhesion between the upper material and the sole can be further improved.

  The shoe provided with a sole formed by the injection manufacturing method in the upper material of the present invention has a good adhesiveness between the upper material and the sole because the injection resin soaks moderately into the bottom or periphery of the upper material, and the appearance. It is good and has excellent comfort.

It is a side view which shows the upper material of this invention. It is a side view which shows the shoes of this invention. It is a figure which shows arrangement | positioning of an adhesion auxiliary | assistant thread | yarn. It is a figure explaining an injection manufacturing method, and shows (a) side sectional view (b) buttock sectional drawing.

  The present invention will be described with reference to the drawings, but is not limited to the following embodiments.

  The present invention is an upper material 1 which is knitted in a sock shape without sewing, and has a knitting density of 8 to 30 wales / inch and a course of 8 to 30 / inch at least where the sole 2 contacts. Yes.

  The upper material 1 knitted in a sock shape without sewing in the present invention means one knitted in three dimensions one by one following a foot shape (sock shape) using a knitting machine, for example, as shown in FIG. doing. The knitted fabric is knitted by repeatedly forming a loop with one or two or more knitting yarns and further forming a new loop through the loop. Therefore, although the upper material 1 consists of the front upper 11, the outer upper side 12, the inner upper side 13, the heel 14, and the bottom surface 15, if a knitting machine is used, each part will be formed into arbitrary solid shapes without sewing together. It is possible.

  The upper material 1 may partially have a double structure for reinforcement. For example, a sock-like interior material prepared separately may be inserted inside the upper material 1 or may be knitted so as to have a double structure using a knitting machine.

  As the knitting machine, it is preferable to use a flat knitting machine capable of knitting a specific range with a specific knitting density.

  In the present invention, at least a portion of the upper material 1 in contact with the sole 2 has a knitting density of 8 to 30 wales (in the horizontal direction) and 8-30 rubles per inch (in the vertical direction). . The knitting density here is an index of the degree of clogging of the stitches, and is indicated by the number of loops per inch. When the wale and the course are less than 8 pieces / inch, the knitting density is small, that is, the gap of the stitches is large, the injection resin is soaked too much, and the exposed and hardened resin makes the surface in contact with the foot worse. . Further, when the wales and the course exceed 30 pieces / inch, because the knitting density is high, that is, the stitches are clogged too much and there are few voids, so that the penetration of the injection resin is inhibited and sufficient adhesiveness cannot be obtained. . In addition, although it is preferable to set it as the knitted fabric of a specific knitting density in the whole area | region of the location which a sole contact | connects, as long as adhesiveness is acquired, you may provide partially.

  In the present invention, the location where the sole 2 of the upper material 1 contacts is the bottom surface 15 of the upper material 1 and the peripheral portion 16 having a width of several millimeters from the bottom surface 15 as shown in FIGS. It is a part that fits in 5. The width d of the peripheral edge is appropriately set depending on the design of the shoe. However, since a problem such as peeling of the sole occurs, it is necessary to be at least 5 mm, and preferably 5 to 15 mm.

The knitting yarn that can be used in the present invention is not particularly limited as long as it is generally used for forming a knitted fabric.
Examples of the material include natural fibers such as cotton, hemp, silk, and wool, and synthetic fibers such as polyester, nylon, and acrylic, and yarns or twisted yarns obtained by spinning these fibers alone or in combination can be used. Examples of the type include monofilament yarn, multifilament yarn, spun yarn, and core-sheath structure.
If the fineness of the knitting yarn is 100 to 700 denier, it is suitable for knitting the upper material of the shoe.

  In the upper material 1 of the present invention, it is preferable that the auxiliary bonding yarn 4 is knitted at a location where it contacts the sole 2. The adhesion auxiliary yarn 4 refers to a yarn having an effect of improving the adhesion to the sole in the injection manufacturing method. In the case of using a knitting machine, it is possible to knit the auxiliary bonding yarn at an arbitrary position when knitting a sock-like upper material. For example, FIGS. 1 and 3 show what is knitted on the bottom surface 15 and the peripheral edge 16 along the width direction of the shoe. In the present invention, it does not exclude that the auxiliary bonding yarn exists in a range where the sole does not contact.

  Examples of the auxiliary bonding yarn 4 include a yarn using a resin that is excellent in adhesiveness with an injection resin. As the injection resin for forming the sole 2, vinyl chloride resin and polyurethane resin are mainly used. However, as the auxiliary auxiliary yarn 4, the same resin as that for forming the sole 2 or adhesiveness to these resins. It is preferable to use an excellent one.

Another example of the auxiliary bonding yarn 4 is a yarn that melts by heat at the time of injection molding. Specifically, the yarn is made of a thermoplastic resin such as nylon or polyester and melts at a temperature of 160 ° C. or less. A hot melt yarn is mentioned.
When vinyl chloride resin is used as the injection resin, the temperature of the molten vinyl chloride resin is around 200 ° C, so if a hot-melt yarn that melts at a temperature of 160 ° C or less is used, it is hot-melted with the injection resin during injection molding. Adhesion is improved by melting the yarn.
Further, when a polyurethane resin is used as the injection resin, the molding temperature is about 100 ° C., but it is considered that the surface of the hot melt yarn is softened or slightly melted due to the exothermic reaction of urethanization and the adhesion is improved.

  A yarn having a shape easily entangled with the injection molding resin can also be used as the auxiliary bonding yarn 4. For example, a yarn whose surface of the knitting yarn is fuzzy or a twisted yarn can be mentioned.

Such an adhesion assisting yarn 4 is preferably contained in an amount of 10% to 50% by weight per unit area.
When the weight ratio of the auxiliary bonding yarn 4 is less than 10%, it is difficult to obtain the effect of auxiliary bonding. On the other hand, when it exceeds 50%, the tactile feeling may be inferior, or the knitted fabric strength may be inferior at the boundary with the portion not including the auxiliary bonding yarn due to thermoforming when forming the sole.

  The shoe 3 of the present invention can be obtained by forming the sole on the upper material 1 of the present invention by an injection manufacturing method, that is, a manufacturing method in which the sole 2 is bonded to the bottom of the upper material at the same time by injection molding.

  As shown in FIG. 4, the injection manufacturing method includes a step of suspending the upper material 1 knitted in a sock-like shape without sewing according to the present invention in a foot mold (last mold) 51, a last mold 51, a side mold 52, and a bottom A process of forming a sole molding cavity by combining the mold 53 and injecting an injection molding resin material from the inlet 54 into the cavity is performed.

  The present invention will be described below based on examples, but is not limited to the examples.

[Create shoes]
Use a flat knitting machine (manufactured by Shima Seiki Seisakusho Co., Ltd., 15 gauge), and use the same upper knitted fabric for the upper, inner and outer upper sides, and heels, and change the knitting density at the point where the sole touches Various socks-like upper materials were knitted. Next, soles were formed on the obtained various upper materials by an injection manufacturing method to obtain shoes. A polyurethane resin was used as the sole resin.

[Example 1]
The upper material was knitted so that the knitting density at the point where the sole touches was 20 courses / inch and 18 wells / inch.
[Example 2]
The knitting density at the point where the sole touches is the same as in Example 1, and further as an auxiliary bonding yarn,
A hot melt yarn (melting point 105 ° C.) of nylon resin manufactured by Toray Industries, Inc. was knitted as shown in FIGS. At that time, the knitted amount was set to 30% by weight per unit area.
[Comparative Example 1]
The upper material was knitted so that the knitting density at the location where the sole touches was 7 courses / inch for the course and 7 pieces / inch for the wells.
[Comparative Example 2]
The upper material was knitted so that the knitting density at the location where the sole contacts was 35 courses / inch and 34 wells / inch.

  In the obtained shoes, the following items were evaluated. The results are shown in Table 1.

[Adhesion]
Regarding the adhesion between the upper part and the sole part, the resin part and the knitted fabric part were clamped with a shopper tensile strength tester, pulled at a speed of 200 mm / min, and the peel strength was measured.

Evaluation criteria: ◎ 30 N / cm or more
○ 20 N / cm or more and less than 30 N / cm
× Less than 20 N / cm

[Joint strength]
Tensile strength was measured in accordance with JIS L 1096 at the knitted fabric at the boundary between the portion with and without the heat fusion yarn in the upper portion.

Evaluation criteria: ○ 130 N / cm or more
× Less than 130 N / cm

[Per foot (seeding out)]
Sensory evaluation was performed by five test subjects on the influence of the injection resin on the bottom of the upper portion on the foot contact when the shoes were worn.

Evaluation criteria: ○ All five subjects do not feel the footsteps
× There is one or more subjects with footsteps

  From Table 1, by knitting so as to have a specific knitting density in the range where the sole of the upper material comes into contact, the penetration amount of the injection resin can be appropriately controlled, and the adhesion between the upper material and the sole is good. In addition, the result was unobtrusive when wearing shoes.

  In Example 2, when a hot melt yarn was used as an auxiliary bonding yarn, the adhesion between the upper material and the sole was further improved.

DESCRIPTION OF SYMBOLS 1 Upper material 11 Front upper 12 Outer side 13 Inner side 14 踵 15 Bottom face 16 Peripheral part 2 Sole 3 Shoes 4 Adhesive auxiliary thread 5 Injection mold 51 Last mold 52 Side mold 53 Bottom mold 54 Injection resin injection port d Periphery Width of part

Claims (4)

Upper material knitted sock-like without sewing,
An upper material characterized in that the knitting density is 8 to 30 pcs / inch for the course and 8 to 30 wales / inch for the lace at least at a position where the sole is in contact.
The upper material according to claim 1, wherein an adhesion auxiliary yarn is knitted at a location where the sole contacts.
The upper material according to claim 2, wherein the auxiliary bonding yarn is a hot-melt yarn that melts at a temperature of 160 ° C. or lower.
A shoe comprising a sole formed by an injection manufacturing method on the upper material according to claim 1.

Images