JP3869190B2 - Finishing method for plastic containers - Google Patents

Description

【００２１】
上記実験結果から、削り屑混入防止には、本発明の如く、段差隙間Ｃが形成されるよう、仕上げ加工を施すことが有効であることが判明した。
【００２２】
上述したところは、本発明の好適な実施例を示したに過ぎず、当業者によれば、請求の範囲において、種々の変更を加えることができる。
【図面の簡単な説明】
【図１】 本発明の一実施例に係る樹脂製容器の仕上げ加工方法を説明する図であって、（ａ）は仕上げ加工すべき樹脂製容器と、回転式の切削刃とを示す一部断面図、（ｂ）は仕上げ加工の状態を示す断面図である。
【図２】 本発明の仕上げ加工が施された樹脂製容器を示す断面図である。
【図３】 仕上げ加工が施された従来の樹脂製容器を示す断面図である。
【符号の説明】
１０ 樹脂製容器
１１ 開口部（樹脂製容器）
１１ｆ 内周面（開口部）
１２ 入口端（開口部）
１３ 出側端（開口部）
１４ 段差部分（開口部）
２０ 仕上げ加工具
２１ テーパ（回転式切削刃）
２２ 最大径部分（回転式切削刃）
ｃ 段差隙間
Ｌ 開口部の全長[0001]
【Technical field】
The present invention relates to a method for finishing a resin container.
[0002]
[Prior art]
As a method of manufacturing a container that can be filled with a liquid or the like, for example, a cylindrical parison is accommodated in a mold and blow-molded. When a blow-molded container is taken out, it is compressed into the parison. The nozzle that ejects air is also removed along with the mold. In this case, since a burr | flash etc. may arise in the opening edge of a container, in order to ensure the sealing performance of a container, as shown in FIG. It is common to finish the inner peripheral surface 11f of the opening 11 by penetrating it.
[0003]
However, in the above finishing process, when the inner peripheral surface of the container opening is finished using a drill or the like, there is an inconvenience that the chip (shavings) enters the inner space of the container. It was necessary to discharge shavings from the inside of the container by performing air blow or the like during processing.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned facts, and when finishing the inner peripheral surface of the container opening using a rotary cutting blade, the shavings enter the internal space of the container. The purpose is to eliminate.
[0005]
[Means for Solving the Problems]
In order to solve this problem, the method for finishing a resin container according to the present invention includes a rotary cutting blade having a taper at the tip, and the finish of the inner peripheral surface of the opening of the resin container is The finishing process is started from the inlet end of the opening, and the finishing process is finished until reaching the outlet end of the opening connected to the internal space of the container.
[0006]
In this case, when finishing the inner peripheral surface of the opening of the resin container, since the rotary cutting blade does not penetrate to the maximum diameter portion, the shavings can be prevented from entering the internal space of the container. .
[0007]
Therefore, according to the present invention, the finishing process applied to the inner peripheral surface of the opening of the resin container can be performed with a smaller number of processes than in the prior art, so that the productivity can be improved while suppressing the manufacturing cost.
[0008]
[Embodiment]
In a preferred embodiment of the present invention, it is preferable that the radial range in which the finishing process is performed by the rotary cutting blade in the container opening is a range exceeding 0.5 mm from the inner surface of the container opening. Furthermore, the range of 1.0 mm or more is particularly preferable.
[0009]
【Example】
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0010]
FIG. 1 is a view for explaining a process for finishing the inner peripheral surface of an opening of a resin container using a rotary cutting blade having a taper at the tip, and (a) should be finished. A container and a rotary cutting blade are shown, (b) is sectional drawing which shows the state of finishing.
[0011]
A container 10 shown in FIG. 1A is a direct blow molded container. Specific examples of the resin material constituting the container include polyethylene (PE) and high-density polyethylene (HD). The finishing tool 20 that is a rotary cutting blade has a taper 21 at the tip. The finishing tool 20 may be a rotary cutting blade having a taper at the tip, and may be a reamer or an end mill in addition to the drill.
[0012]
Next, the finishing method according to this embodiment will be described in detail with reference to FIGS.
[0013]
As shown in FIG. 1A, the resin container finishing method according to the present invention finishes the inner peripheral surface by introducing a finishing tool 20 from the inlet end 12 of the opening 11 of the resin container 10. Apply. As shown in FIG. 1B, the finishing tool 20 starts finishing from the inlet end 12 of the opening 11 and reaches the exit end 13 of the opening 11 connected to the internal space of the container 10. Finish processing.
[0014]
In this case, when finishing the inner peripheral surface of the opening 11 of the resin container 10, the finishing tool 20 does not penetrate to the portion of the maximum diameter φmax, so that the shavings enter the internal space of the container 10. Intrusion can be prevented.
[0015]
Specifically, the finished opening 11 has a cross-sectional shape as shown in FIG. 2, and a stepped portion 14 of the gap c is formed between the inlet end 12 and the outlet end 13. Therefore, the step portion 14 prevents the shavings generated by the cutting process from being drawn into the internal space of the container 10. However, the dimension of the gap c that forms the stepped portion 14 is a range that does not affect the inner diameter dimension of the opening 11 and the strength and sealability of the container opening.
[0016]
Further, in the present embodiment, since the finishing tool 20 has a smaller cutting amount than the conventional finishing process in which the finishing tool 20 penetrates the opening 11, and the shavings are also reduced, the discharging from the opening 11 is facilitated.
[0017]
Therefore, according to the present embodiment, the finishing process applied to the inner peripheral surface of the opening portion 11 of the resin container 10 can be performed with a smaller number of processes compared to the conventional method, so that the productivity can be improved while suppressing the manufacturing cost. Can be planned.
[0018]
In a preferred embodiment of the present invention, the radial range in which the finishing process is performed by the finishing tool 20 in the container opening 11, that is, the step gap c is a range exceeding 0.5 mm from the inner surface of the opening 11. It is preferable. Furthermore, the range of 1.0 mm or more is particularly preferable.
[0019]
Next, experimental results in the present invention will be described. In the experiment, a conventional processing method A in which a drill made of a high-density polyethylene was used, the drill (material φ25CPN) as the finishing tool was rotated at 1200 rpm, and no air blow was performed after finishing. The present invention processing method B in which the step gap C is formed, that is, finish each 200 pieces in 4 patterns of a) C = 0.5 mm, b) C = 1.0 mm, c) C = 1.5 mm, The number of shavings mixed was confirmed. The results are shown in Table 1.
[0020]
[Table 1]

[0021]
From the above experimental results, it has been found that it is effective to perform finishing so as to form the step gap C as in the present invention in order to prevent shavings from being mixed.
[0022]
The above description is only a preferred embodiment of the present invention, and various modifications can be made by those skilled in the art within the scope of the claims.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a finishing method of a resin container according to an embodiment of the present invention, in which (a) is a partial view showing a resin container to be finished and a rotary cutting blade; Sectional drawing and (b) are sectional drawings which show the state of finishing.
FIG. 2 is a cross-sectional view showing a resin container that has been subjected to the finishing process of the present invention.
FIG. 3 is a cross-sectional view showing a conventional resin container that has been finished.
[Explanation of symbols]
10 Resin container 11 Opening (resin container)
11f Inner peripheral surface (opening)
12 Entrance end (opening)
13 Outlet end (opening)
14 Stepped part (opening)
20 Finishing tool 21 Taper (rotary cutting blade)
22 Maximum diameter part (rotary cutting blade)
c Step gap L Total length of the opening

Claims (2)

When finishing the inner peripheral surface of the opening of the resin container using a rotary cutting blade having a taper at the tip,
A finishing method for a resin container, wherein finishing is started from an inlet end of the opening and the finishing is finished before reaching the outlet end of the opening connected to the internal space of the container. The method according to claim 1, wherein a radial range in which the finishing process is performed by the rotary cutting blade in the container opening is a range exceeding 0.5 mm from the inner surface of the container opening.

Images