JPH06247475A - Production of screen window for side wall of cylindrical body - Google Patents

Abstract

PURPOSE:To make a ventilating screen window for use in the side wall of a cylindrical body in a simpler manner than the conventional screen window. CONSTITUTION:A pair of die members having joining faces are provided, a side wall molding cavity 7 is provided in the one die member, a window hole forming raised part 8 adapted to project into the cavity 7 is provided in either of the die members, either horizontal net line molding cavity 9 or vertical net line molding cavity 11 is provided in the window hole forming raised part 8 formed in the one die member and either of horizontal net line molding cavity 9 and vertical net line molding cavity 11 not formed in the aforesaid raised part 8 is provided in the other die member. In this way is formed a die wherein, when both the die members are joined together, the intersecting points of the horizontal net line molding cavity 9 and the vertical net line molding cavity 11 communicate with one another and wherein both the ends of the cavity 9 and of the cavity 11 communicate with the side wall molding cavity 7. All of the cavities 7, 9 and 11 of this die are filled with molten resin for curing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of providing a mesh window on a side wall of a cylindrical body such as a cap of a container for ventilation. The cylindrical body is not limited to a cylindrical shape, and includes a cylindrical body having a rectangular cross section.

[0002]

2. Description of the Related Art Conventionally, in order to provide a mesh window on the side wall of a tubular body, a window hole is formed in the side wall of the tubular body, and the mesh body is formed separately from this, and the peripheral edge of the mesh body is formed. The method of welding to the opening edge of the window has been adopted.

[0003]

The conventional method of manufacturing a mesh window as described above has many steps and is complicated. Therefore, an object of the present invention is to provide a novel manufacturing method capable of efficiently manufacturing a mesh window with a small number of steps.

[0004]

In order to achieve the above object, a method of manufacturing a mesh window on a side wall of a tubular body of the present invention comprises a pair of mold members having mating surfaces, one of which is The side wall forming cavity 7 is provided in the mold member, and the window hole forming convex portion 8 projecting into the side wall forming cavity 7 is provided in either one of the mold members, and the window hole provided in the one mold member. The forming convex portion 8 is further provided with one of the net horizontal line forming cavity 9 or the net vertical line forming cavity 11, and the other mold member is provided with the net horizontal line forming cavity 9 or the net vertical line forming cavity 11. In the state where both the mold members are combined, the intersection point of the horizontal line forming cavity 9 of the net and the vertical line forming cavity 11 of the net communicate with each other, and the horizontal line forming cavity 9 of the net and the vertical line of the net are connected. Forming cavity 1 Both ends of which form a mold communicating with the above-mentioned side wall forming cavity 7, and each of the above-mentioned cavities 7, 9, 11 of this mold is filled with molten resin and solidified. .

[0005]

According to the manufacturing method of the present invention, the side wall of the cylindrical body and the mesh window can be integrally formed at the same time. Further, since the horizontal line forming cavity 9 and the vertical line forming cavity 11 are separately provided in separate mold members, the resin flow in each cavity is good, and each corner of the cavity can be swiftly and reliably. Filled with resin.

[0006]

Embodiments will be described below with reference to the drawings. First, FIGS. 2 to 4 show an example of a cap 1 manufactured by carrying out the present invention. That is, the cap 1 is a circular tubular body, and the side wall 2 thereof is provided with the mesh window 3. The mesh window 3 has a structure in which a mesh composed of a large number of thin horizontal lines 4 and a large number of thin vertical lines 5 orthogonal to these is stretched in the window hole.

FIG. 1 shows a manufacturing process of the mesh window 3. In the figure, 6 is a cavity plate, and this cavity plate 6 is slidable in the lateral direction. The cavity plate 6 is provided with a side wall forming cavity 7, and a horizontal hole forming cavity 9 is formed in a window hole forming convex portion 8 protruding into the side wall forming cavity 7. Both ends of the horizontal line forming cavity 9 communicate with the side wall forming cavity 7.

In the figure, 10 is a vertically movable core, and a side wall of the core 10 is provided with a cavity 11 for forming a vertical line of mesh. The vertical line forming cavity 11 is a thin groove in the same direction as the core 10 drawing direction (longitudinal direction) and communicates with the horizontal line forming cavity 9 at an intersection orthogonal to the horizontal line forming cavity 9 and also with the side wall forming cavity 7. Both ends communicate.

When the thermoplastic resin is heated and melted to fill the side wall forming cavity 7 from the gate (not shown) of the mold, the resin is further filled up to the vertical line forming cavity 11 and the horizontal line forming cavity 9. It

When cooled thereafter, the resin inside the side wall forming cavities 7, the vertical line forming cavities 11 and the horizontal line forming cavities 9 is solidified, and the cavity plate 6 is moved in the horizontal direction and the core 10 is moved in the vertical direction. When moved to and opened, the molded product of the cap 1 having the mesh window 3 on the side wall 2 as shown in FIG. 2 can be taken out.

As in the above embodiment, the cavity plate 6 which is slidable in the lateral direction is provided with the window hole forming projections 8 and the horizontal line forming cavities 9, and the vertically moving core 10 is arranged in the vertical line. If the forming cavity 11 is provided, the occurrence of undercut can be avoided.

[0012]

The present invention is as described above, and since the mesh window can be formed integrally with the side wall and at the same time, it is not complicated as in the conventional method of separately forming and welding the mesh bodies. The process is extremely simplified and the cost is reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a manufacturing process.

FIG. 2 is a perspective view of a molded product.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap 2 Side wall 3 Mesh window 4 Horizontal line 5 Vertical line 6 Cavity plate 7 Side wall forming cavity 8 Window hole forming convex portion 9 Horizontal line forming cavity 10 Core 11 Vertical line forming cavity

Claims (1)

[Claims] 1. A pair of mold members having mating surfaces to each other, a side wall forming cavity 7 is provided in one of the mold members, and a window hole forming convex portion protruding into the side wall forming cavity 7 is formed. 8 is provided on one of the mold members,
The window hole forming projection 8 provided on one of the mold members is further provided with one of a net horizontal line forming cavity 9 and a net vertical line forming cavity 11, and the other mold member is provided with a net horizontal line forming cavity. 9 or the other of the vertical line forming cavities 11 of the net is provided, and the intersections of the horizontal line forming cavities 9 of the net and the vertical line forming cavities 11 of the net communicate with each other in a state where both mold members are combined, and Both ends of the horizontal line forming cavity 9 and the net vertical line forming cavity 11 form a mold that communicates with the side wall forming cavity 7, and the resin melted in each of the above cavities 7, 9, 11 of the mold. A method for manufacturing a mesh window on a side wall of a tubular body, which comprises filling with solidification.