JP2004074477A - Mold device for molding resin needle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To produce a resin needle which can be segregated easily and incinerated. <P>SOLUTION: A mold device M is composed of the first mold 10 having a cavity 11 for molding the outline of the resin needle, the second mold 20 having a cavity 21 connected to the tip side of the cavity 11 of the first mold 10, and a mold sliding mechanism which slides one of the molds 10 and 20 along the mold mating face A of the molds 10 and 20. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mold device for molding a resin needle.
[0002]
[Prior art]
BACKGROUND ART A hollow needle such as an injection needle is manufactured by drawing a pipe made of a metal such as stainless steel and reducing the diameter, and sharpening the cutting edge.
In recent years, injection needles and syringes that are discarded after a single use are often used to prevent secondary infection accidents. Disposal of such injection needles and syringes is performed by specialized companies because the injection needles are made of metal and cannot be incinerated, and the tips are sharp and dangerous. There is.
[0003]
In addition, since there is a risk that a needlestick accident may occur during storage before disposal, danger prevention is achieved by putting a cap on the used injection needle, but it is easy to cause a needlestick accident when putting the cap on. There are also problems.
[0004]
A metal injection needle is generally firmly adhered to a resin needle base. For this reason, not only the problem that the assembly of the needle and the needle base is costly, but also the problem that it is difficult to separate and discard the metal and the resin.
[0005]
[Problems to be solved by the invention]
From such a problem, the production and use of resin needles have been conventionally proposed, for example, as disclosed in Japanese Patent Publication No. 2-56899. However, it is extremely difficult to sharpen the cutting edge of a resin needle, and in particular, needle molding by resin injection molding, which is a manufacturing method suitable for mass production, has not been realized.
[0006]
The present invention has been made in view of the above problems, and has as its object to realize the manufacture of a resin needle that can be easily separated and can be incinerated.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, a resin needle molding die apparatus according to the invention of claim 1 includes a first die having a cavity for molding an outer shape of a resin needle, and the first die. A second mold having a continuous cavity at the tip side of the cavity, and a mold that slides any one of these molds along a mold mating surface between the second mold and the first mold. And a slide mechanism.
According to this invention, the needle having the cutting surface as the cutting surface can be formed by sliding the mold along the matching surface, so that a resin needle having a sharp cutting edge can be formed.
[0008]
The resin needle molding die apparatus according to the second aspect of the present invention is the resin needle molding die apparatus according to the first aspect, further provided in the cavity of the first mold to allow the resin needle to be hollow. And a core pin driving mechanism for driving the core pin along the axial direction of the cavity.
According to the present invention, it is possible to realize the manufacture of a hollow resin needle such as an injection needle by arranging and molding the core pin in the cavity.
[0009]
According to a third aspect of the present invention, there is provided the resin needle molding die apparatus according to the first or second aspect, wherein a mold mating surface between the first mold and the second mold is provided to be inclined. It is characterized by:
According to the present invention, a resin needle having a sharper cutting edge can be manufactured by the inclination of the molding surface.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, a resin needle molding die apparatus M according to the present embodiment includes a molding die (first die) 10 having a cavity 11 for molding the outer shape of a resin needle 100, and the molding die 10. A slide mold (second mold) 20 having a cavity 21 that is continuous with the tip side of the cavity 11 of the mold 10 and a core pin 30 provided in the cavity 11 of the mold 10 to mold the resin needle 100 into a hollow. In addition, both surfaces of the mold 10 are configured as PL surfaces (mold matching surfaces) A and B.
[0011]
The molding die 10 has a cavity 11 and a runner portion 12 communicating with the cavity 11, and includes a lower surface 13 orthogonal to the axial direction of the cavity 11, and an inclined slope 14. The cavity 11 has a cylindrical inner surface for molding the outer shape of the resin needle 100 and is formed so as to penetrate the molding die 10 and open on the PL surfaces A and B. The inclined surface 14 is inclined with respect to the cavity 11 so as to have an inclined shape of the cutting edge of 100 resin needles. The cavity 11 and the runner section 12 are closed by the mold 10 contacting the slide mold 20 and the lower plate 40 on the PL surfaces A and B, respectively. The closed cavity 11 is filled with a molten resin injected from an injection machine (not shown) via a runner section 12.
[0012]
The slide die 20 is provided with a cavity 21 having a cylindrical inner surface continuous with the cavity 11 of the molding die 10, and is capable of moving back and forth in the axial direction of the cavity 11 with respect to the molding die 10 and sliding along the PL surface A (the inclined surface 14). It is provided as possible. The slide mold 20 retreats when the molded product is taken out, separates from the mold 10 and opens the PL surface A, and when resin is injected, advances and abuts on the inclined surface 14 of the mold 10 with the sliding surface 22 to form the cavity. 11 can be closed by the cavity 21. Further, the slide mold 20 is driven by the mold slide mechanism 60 and slides along the PL surface A (the inclined surface 14), so that the slide mold 20 can move so as to shift the position of the cavity 21 with respect to the cavity 11. . The mold slide mechanism 60 is configured by, for example, an air cylinder mechanism, and can slide the slide mold 20 along the PL surface A of the molding mold 10 and the slide mold 20.
[0013]
The lower plate 40 is provided so as to be able to advance and retreat in the axial direction of the cavity 11 with respect to the molding die 10. When the molded product is taken out, the lower plate 40 retreats and separates from the molding die 10 to open the PL surface B, while when injecting the resin. By moving forward, it comes into contact with the mold 10 and the base end side of the cavity 11 can be closed.
[0014]
The core pin 30 has a cylindrical outer surface forming the inner surface of the resin needle 100 and a distal end surface 31 coinciding with the PL surface A, and is arranged so as to penetrate the lower plate 40 and advance and retreat in the cavity 11. The core pin 30 is driven separately from the lower plate 40 by a core pin driving mechanism 50. The core pin driving mechanism 50 is configured by, for example, an air cylinder mechanism, and can drive the core pin 30 along the axial direction of the cavity 11.
[0015]
Here, a molding process using the resin needle molding die apparatus M configured as described above will be described.
[Mold clamping process]
First, the PL surface A and the PL surface B are closed and mold-clamped with the distal end surface 31 of the core pin 30 protruding from the inclined surface 14 as shown in FIG.
[0016]
[Injection process]
As shown in FIG. 2, the cavities 11 and 21 of the clamped mold apparatus M are filled with a molten resin via the runner section 12. At this time, it is difficult for the molten resin to fill the entire cavity 21 because the cavity 11 is narrow, but it is necessary to fill at least the inside of the cavity 11 and to fill the cavity 21 beyond the PL plane A.
[0017]
[Core pin retreating process]
After the molten resin filled in the cavities 11 and 21 is solidified, the core pin 30 is retracted by using the core pin driving mechanism 50 so that the front end surface 31 coincides with the PL surface A, as shown in FIG.
[0018]
[Tip cutting / removal process]
With the front end surface 31 aligned with the PL surface A, as shown in FIG. 4 (a view taken along the line IV-IV in FIG. 3), the mold slide mechanism is moved to a position where the cavity 21 does not communicate with the cavity 11. The slide mold 20 is slid along the PL surface A (the slope 14 and the sliding surface 22) by using 60, and the resin that has solidified in the cavities 11 and 21 communicated with each other is cut by the peripheral edge of the cavity 21. At this time, since the core pin 30 fitted inside the solidified resin is cut as a support, the tip of the resin needle 100 is formed in a sharp shape.
[0019]
By moving the slide mold 20 in this manner, the tip of the resin needle 100 is formed, and the cavity 21 in which the remaining material is left is opened. Dispensed from 20 and prepared for the next molding step.
Then, by lowering the lower plate 40 to open the PL surface B and taking out the molded resin needle 100 (and the runner) from the mold apparatus M, the resin needle 100 having a sharp cutting edge can be obtained.
[0020]
As described above, the mold is configured such that the PL surface A obliquely crossing the cavity axis direction is formed at an intermediate portion of the cavities 11 and 21 of the ultrafine columnar shape, and the molten resin filled in the cavities is formed. By sliding the mold along the PL surface A after cooling and solidifying, the resin can be cut along the PL surface A, so that the resin needle 100 having a sharp cutting edge can be injection-molded.
[0021]
The various shapes, combinations, and the like of the constituent members shown in the above-described embodiment are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.
[0022]
【The invention's effect】
As described above, according to the resin needle forming die apparatus according to the first aspect of the present invention, the needle having the die mating surface as the blade tip surface is formed by sliding the die along the die mating surface. As a result, a resin needle having a sharp cutting edge can be formed. Therefore, the tip of the cavity, not the tip of the cavity at the time of filling the resin, is formed as a needle tip. Can be manufactured by injection molding of a resin.
[0023]
According to the resin needle molding die apparatus according to the second aspect of the present invention, it is possible to realize the production of a hollow resin needle such as an injection needle by arranging and molding the core pin in the cavity. it can. This realizes a resin injection needle or a blood transfusion needle, which eliminates the need to separate the metal portion from the resin portion, enables incineration, and facilitates disposal of used medical needles.
[0024]
Further, according to the resin needle molding die apparatus according to the third aspect of the present invention, a resin needle having a sharper cutting edge can be manufactured by the inclination of the mold mating surface.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a main part of a resin needle molding die apparatus according to an embodiment of the present invention.
FIG. 2 is a view showing an injection step in the mold apparatus shown in FIG.
FIG. 3 is a view showing a core pin retracting step in the mold apparatus shown in FIG. 1;
FIG. 4 is a view showing a tip cutting and remaining material discharging step in the mold apparatus shown in FIG. 1;
[Explanation of symbols]
REFERENCE SIGNS LIST 10 first mold 11, 21 cavity 20 second mold 30 core pin 50 core pin drive mechanism 60 mold slide mechanism 100 resin needle M resin needle molding die apparatus

Claims (3)

A molding die apparatus for injection molding a resin needle,
A first mold having a cavity for molding the outer shape of the resin needle, a second mold having a cavity continuous with a tip end of the cavity of the first mold, and a second mold. A mold slide mechanism for sliding any one of these molds along a mold mating surface with the first mold. 2. The resin needle molding die apparatus according to claim 1, further comprising: a core pin provided in a cavity of the first mold for molding the resin needle into a hollow, and the core pin being a shaft of the cavity. And a core pin driving mechanism for driving the resin in a direction. The mold device for resin needle molding according to claim 1 or 2, wherein a mold mating surface between the first mold and the second mold is provided at an inclination.

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