JPS58185105A - Production of injection molded shoes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing double injection injection molded shoes using a dummy last.

Conventionally, in the case of the manufacturing method of injection molded shoes using double injection using dummy lath (dummy lath) Th, as shown in Fig. 9, the primary mold made up of dummy lath (3), side mold (2), and bottom mold (1) is used. The bottom molding cavity (4) is completely formed, and the bottom molding cavity (4) is completely formed, as shown in FIG.
After injecting the primary injection material into the primary outsole #5), the dummy lath (3) ffi was removed, and the last (7) with the lace cover (6) suspended, as shown in Figure 11, was formed. ), the primary outsole (5) and side mold (2) present at the last stop.
) to form a secondary outsole molding cavity (8).

Next, as shown in FIG. 12, after injecting the secondary injection material to completely form the secondary outsole (9), the side mold (2),
Bottom mold (14) Open at 1 and close at the end (
14), and injection molded shoes as shown in FIG. 13 were obtained.

However, this manufacturing method performs the first injection molding, - after forming the missing bottom sole (5), the dummy lath [3] is formed.
f: When taking out, part or all of the upper surface of the missing outsole (5) touches the bottom of the dummy last (3), and as shown in Figure 11, the primary outsole [5] is attached to the bottom mold (14). In many cases, part or all of the design surface was raised. If you perform the second injection molding as it is, the first
As shown in Figure 2, part of the secondary injection molding material is
5) If the first and second injection materials are different colors, this may cause a defective product that is not separated into the upper and lower two colors. It became. In order to prevent this phenomenon, the worker must hold the partially or fully lifted primary outsole (5) in the machine tray and manually push it into the designed surface of the bottom mold (14), which may reduce work efficiency. There were complications.

The present invention provides a method for manufacturing injection molded shoes that eliminates these conventional drawbacks.

That is, the present invention provides a method for manufacturing injection molded shoes that uses a dummy 2-stroke and is injected twice, which is characterized in that an overhang design is provided in part or all of the bottom mold design. Involved.

Hereinafter, the present invention will be explained in detail based on the drawings. As shown in Fig. 1, the primary outsole molding cavity (fl), which is composed of a bottom mold (fl) in which part or all of the bottom mold design is provided with an overparts design, a side mold (2), and a dummy last (3), 4) Form. Side mold (2)
generally uses a side mold that can be divided into two laterally. Next, as shown in FIG. 2, the primary injection material (gold) is injected into the gap (4) for forming the missing bottom to completely form the primary bottom (5). The primary injection material is generally . Next, remove the dummy last (3) and remove the cover (6) as shown in Figure 3.
A secondary outsole molding gap (8) is formed from the last (7) suspended from the last (7), the primary outsole (5) existing on the last, and the side mold (2).

Then, as shown in FIG. 4, a secondary injection molding material is injected to completely form the secondary outsole (9). The secondary injection molding material is M
The material may be the same as the primary injection molding material, or may be different as long as there is compatibility. Generally, they are made of the same material but in different colors so that the completed outsole has two colors laminated from the sides. Next, after the secondary outsole (9) is completely formed, the side molds (2) and bottom mold (1) are fully opened and the shoe is taken off from the last (7) to obtain an injection molded shoe as shown in FIG.

The overhang design provided on the bottom mold (1) used in the present invention refers to a shape in which the upper end width of the design component piece (10) is longer than the lower end width.
The open part (12) of the cavity (1]) formed by the design component (10) and the design component (10) is
) (Bottom surface of the recess on the surface of the last mold) Including narrower ones.More specifically, when the primary outsole (5) is formed, some parts of the design surface have a reverse taper shape and can be easily A design that is formed so that it cannot be separated is defined here as an overhang design. For example, as shown in FIG. 6, the cross section of the design component (10) may be T-shaped, or as shown in FIG. 7, the cross section of the design component (10) may be in the shape of an inverted triangle. , as shown in Figure 8,
The cross sections of the design constituent pieces (10) (10) may be combined in a square shape. In addition, these various design configurations
0), or may be used in combination with a general design such as a waveform design.

The present invention provides an over-part design on the top surface of the bottom mold, so that when the dummy last is separated from the primary outsole, the next outsole tapers inversely to the over-part design on the top surface of the bottom mold. Since the upper surface of the primary outsole was partially or completely stuck to the lower surface of the dummy last, the position did not shift. Since the two layers of the sole do not intertwine in a complicated manner, injection molded shoes with normal two layers can be obtained.1. Also, since the outsole does not lift up, when the dummy last is removed, This eliminates the need for the worker to look into the bottom mold each time to see if the primary outsole has risen, improving work efficiency and reducing work time. Furthermore, since the present invention is achieved by providing an overhang design on the upper surface of the bottom mold, it not only increases the area of the upper end of the design component without changing the sole design, but also increases the area of the upper end of the design component, which is conventionally used. It is possible to express the design without changing the sole design.

[Brief explanation of the drawing]

FIGS. 1 to 5 are explanatory diagrams showing the manufacturing process of injection molded shoes of the present invention, FIGS. 6 to 8 are schematic cross-sectional views for explaining the overhang design of the present invention, and FIGS. 9 to 13th
The figure is an explanatory diagram showing the manufacturing process of injection molded shoes using a conventional dummy last and double injection. (1)...Bottom mold country with an overbang design...Side mold (3)...Dummy last (4)...-Missing bottom molding gap (5)...-Missing bottom ( 6)...Flip cover (7)...Last (8)...Secondary outsole molding gap (9)...Secondary outsole (10)...Design component (11)...・Void part (12)...Open part (13)...Bottom patent applicant -7- (13

Claims (1)

[Claims] A method for manufacturing injection molded shoes using a dummy last layer and using a double injection method, the method comprising using a bottom mold in which part or all of the bottom mold design is provided with an overbank design.