JP3896633B2 - Mold device for injection molding of ink storage member having many parallel blades - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold apparatus for injection molding of a resin molded product having a large number of parallel blades. Here, as an example of a resin molded product having a large number of parallel blades, a temporary ink storage member used in a fountain pen, a direct liquid writing instrument, or an ink jet printer that has been attracting attention in recent years. There are temporary ink storage members that are used, or ink storage members that allow ink to permeate a pad such as a stamp.
[0002]
[Prior art]
Conventionally, a mold apparatus as shown in FIGS. 4 to 6 is known as an injection mold apparatus for a resin molded product having a large number of parallel blades. Inside the cavity 10, a core made up of a large number of parallel split split plates 11 is arranged. The thickness of the parallel blades of the molded product is determined by the length of the interval between the parallel dividing plates 11, and the interval of the parallel blades is determined by the thickness of the parallel dividing plate 11.
[0003]
[Problems to be solved by the invention]
In the above prior art, as shown in FIGS. 4 to 6, when the resin begins to flow into the mold cavity 10 from the gate 12 at high speed and high pressure, the resin 13 that has flowed in easily moves straight, and the parallel dividing plate under the gate. 11 and flows in the left-right direction when the flowing resistance increases. Before flowing to the parallel dividing plate 11 from side to side, the parallel dividing plate 11 under the gate falls to the left and right. Since the space between the second parallel dividing plate 11 on the left and right and the parallel dividing plate 11 below the gate is narrow, it is difficult to flow, and further flows in the left-right direction. When it flows through the third parallel dividing plate 11 on the left and right, it does not flow into the second parallel dividing plate 11 and therefore it is tilted to the second parallel dividing plate 11 side.
In this way, the resin is filled between the parallel dividing plates 11, but the blades having different thicknesses and narrowed upper portions are stretched or broken at the time of mold release. There was a problem that the repeated stress of the material worked and was damaged.
[0004]
[Means for Solving the Problems]
The present invention aims to solve the above problems, is disposed a core having a number of parallel dividing plates in the cavity, connecting portion two parallel dividing plates adjacent located below the Gate It is characterized by being connected by.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described in detail based on one example shown in FIGS.
1 is a fixed mold, 2 and 3 are split molds, and a core 5 having a large number of parallel dividing plates 5a is disposed in the cavity 4 as shown in FIGS. Two connecting portions 7 and 8 are formed and integrated between the gap portions of the two parallel dividing plates 5a.
[0006]
Next, the operation will be described.
Resin begins to flow into the cavity 4 from the gate 6 at high speed and high pressure, and filling of the blades 9a under the gate 6 begins. Since the two parallel dividing plates 5a are integrally strong and do not deform. Next, the resin flows in the left-right direction. Once it begins to flow in the left-right direction, it becomes easier to flow in that direction. A molded product 9 in which the second and subsequent blades 9a are uniform is obtained.
[0007]
【The invention's effect】
The present invention is disposed a core having a number of parallel dividing plates in the cavity, so are connected by a connecting portion two parallel dividing plates adjacent located below the Gate, parallel dividing plate A molded product having uniform blades with uniform thickness and spacing is obtained without falling. Further, since the parallel split plates do not fall down, it is possible to reliably prevent the blades of the molded product from being undercut and coming off, and the parallel split plates are not damaged by repeated stress.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a mold cavity when resin is filled according to the present invention.
FIG. 2 is a perspective view of the outer appearance of a core in FIG.
3 is an external perspective view in which two parallel dividing plates under the gate of FIG. 2 are integrated. FIG.
FIG. 4 is an external perspective view of a conventional core.
FIG. 5 is a front sectional view of a mold cavity at the time of conventional resin filling.
FIG. 6 is an enlarged view of a part shown in FIG. 5A.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixed mold 2,3 Split mold 4 Cavity 5 Core 5a Parallel dividing plate 6 Gate 7, 8 Connection part 9 Molded product 9a Blade

Claims (1)

It arranged a core having a number of parallel dividing plates in the cavity, having a number of parallel blades, characterized in that it has connected by a connecting portion two parallel dividing plates adjacent located below the Gate Mold device for injection molding of ink storage member.

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