JP2004115112A - Blister pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blister pack in which a dent or a break on impact can be prevented as much as possible. <P>SOLUTION: The blister pack has a curvature formed from the top part to the bottom part of the blister pack and the dent or the break on impact can be prevented as much as possible by the curvature. <P>COPYRIGHT: (C)2004,JPO

Description

【００１１】
また、前期試験において、残留応力を測定した。撮影による測定であって、図１７に示すものが実施例であり、図１８に示すものが比較例である。比較例に比し、実施例の方が残留応力が少ないことがわかる。
【００１２】
【発明の効果】
本発明は、ブリスターパックの頂部から底部にかけて湾曲形成させたので、衝撃によるブリスターパックの凹みや割れを極力防止することができる。
【図面の簡単な説明】
【図１】実施例の分解斜視図。
【図２】成形工程を示す縦断面図。
【図３】図２の上面図。
【図４】図３の側面図。
【図５】成形工程を示す縦断面図。
【図６】比較例１を示す金型の縦断面図。
【図７】図６の上面図。
【図８】図７の側面図。
【図９】成形工程を示す縦断面図。
【図１０】成形工程を示す縦断面図。
【図１１】比較例２の成形工程を示す縦断面図。
【図１２】図１１の上面図。
【図１３】図１２の側面図。
【図１４】図１１の要部拡大図。
【図１５】実施例の肉厚状態を示す要部縦断面図。
【図１６】比較例１、２の肉厚状態を示す要部縦断面図。
【図１７】実施例の残留応力状態を示す写真。
【図１８】比較例２の残留応力を示す写真。
【符号の説明】
１　　収容物
２　　ブリスターパック部
３　　流線型部
４　　開口部
５　　シール材
６　　金型
７　　シート材
９　　空間
１０　　薄肉箇所
１１　　凹み
１２　　肉厚差[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to blister packs.
[0002]
[Prior art]
The blister pack is made of vinyl chloride, polyethylene terephthalate, polystyrene, polypropylene, or the like, molded into a box shape, and after storing the contents, the opening is sealed with a sealing material made of PP sheet or cardboard. It has a structure with impact resistance.
Further, in the distribution process from shipment of the factory to display at the store, the pieces are arranged in a box every 5 to 12 pieces. If an impact such as a drop is received in this state, the inherent flexibility of the blister pack cannot be exhibited due to the arrangement in the box, and the product may break through the blister pack and become undisplayable. For this reason, measures have been taken such as providing a recess in the blister pack to make it easier to absorb impact (see Patent Document 1).
[0003]
[Patent Document 1]
JP-T-2001-500827 (FIG. 1)
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned prior art, some impact can be absorbed, but there is still room for development. More specifically, if an impact is applied to the corner of the blister pack, the corner is dented and damages the product. It is exposed.
[0005]
[Means for Solving the Problems]
Therefore, the gist of the present invention is that the blister pack is curved from the top to the bottom.
[0006]
【Example】
Example;
Hereinafter, the first embodiment will be described in detail with reference to FIGS. In the figure, reference numeral 1 denotes an article to be packaged in a packaging container, which is, for example, a column-shaped writing instrument as in the related art.
The blister pack 2, which is the main body of the packaging container, is made of a molded product such as vinyl chloride, polyethylene terephthalate, polystyrene, or polypropylene, and a PP sheet is formed in the opening 4 of the blister pack 2, as in the prior art. By sticking a sealing material 5 such as paper or cardboard, the container 1 is accommodated, and the blister pack portion 2 is closed or sealed.
In such a blister pack, in the present invention, both end surfaces 3 in the longitudinal direction of the blister pack portion 2 have a smooth streamline shape. That is, it is curved from the top of the blister pack portion 2 to the sealing material 5. The streamlined portion 3 is preferably provided on both sides, but may be provided on only one side. However, considering a fall or the like, the side facing downward when dropped, that is, the side on which an impact is likely to act. It is preferable to form it.
[0007]
FIG. 2 shows a cross-sectional view of a mold 6 for vacuum-forming the blister pack portion 2 and a sheet material 7. 3 is a view of the mold 6 of FIG. 2 as viewed from above, and FIG. 4 is a view of the mold 6 of FIG. 2 as viewed from the side. In this manner, by forming the end face 3 in the longitudinal direction of the blister pack portion 2 in a smooth streamline shape, the thickness of both end faces 3 due to the elongation of the sheet material 7 vacuum-formed by the mold 6 as shown in FIG. As a result, stress concentration upon impact and generation of residual stress during molding can be prevented.
[0008]
Comparative Example 1;
FIG. 6 shows a mold shape for forming a blister pack portion in accordance with the shape of the contents. 7 is a view of the mold 6 of FIG. 6 as viewed from above, and FIG. 8 is a view of the mold 6 of FIG. 6 as viewed from the side. In the mold shape shown in FIG. 6, since the angles of both end surfaces 3 in the longitudinal direction are nearly perpendicular, a space 9 is formed during the molding as shown in FIG. 9, and a thin portion 10 is generated when the molding shown in FIG. 10 is completed.
Comparative Example 2;
FIG. 11 shows a mold shape for molding a bubble having a recess 11 in the end face 3 in the longitudinal direction. FIG. 12 is a view of the mold 6 of FIG. 11 as viewed from above, and FIG. 13 is a view of the mold 6 of FIG. 11 as viewed from the side. FIG. 14 is a cross-sectional view of the blister pack portion 7 formed by the mold 6 of FIG. 11, and a thin portion 10 at the time of molding occurs on both end surfaces 3 in the longitudinal direction similarly to the mold shape of FIG. ing.
When the thin portion 10 is generated, a thickness difference 12 is generated, and the stress at the time of receiving an impact is concentrated, so that the portion is easily broken. Further, a portion such as the dent 11 that is greatly deformed at the time of molding, that is, a small curved portion, is likely to be cracked by an impact due to generation of residual stress.
[0009]
The test specimens were tested by changing the thickness of the sheet material in various ways. Table 1 shows the results.
The test method is as follows. Each of the test items contained the same container, sealed with the same backing paper, and stored in the same outer box of 10 coated balls. Dropped vertically on concrete ground to add.
15 (Example) and FIG. 16 (Comparative Examples 1 and 2) show the molded state of each test sample. It is understood that the numerical values described in the figure are the thickness (unit: mm) of the main part, and the dimensional variation of the thickness in the example is small.
[0010]
[Table 1]

[0011]
In the first test, residual stress was measured. FIG. 17 shows an example of measurement by photographing, and FIG. 18 shows a comparative example. It can be seen that the example has less residual stress than the comparative example.
[0012]
【The invention's effect】
In the present invention, since the blister pack is curved from the top to the bottom, dents and cracks of the blister pack due to impact can be prevented as much as possible.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an embodiment.
FIG. 2 is a longitudinal sectional view showing a molding step.
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a side view of FIG. 3;
FIG. 5 is a longitudinal sectional view showing a molding step.
FIG. 6 is a longitudinal sectional view of a mold showing Comparative Example 1.
FIG. 7 is a top view of FIG. 6;
FIG. 8 is a side view of FIG. 7;
FIG. 9 is a longitudinal sectional view showing a molding step.
FIG. 10 is a longitudinal sectional view showing a molding step.
FIG. 11 is a longitudinal sectional view showing a molding step of Comparative Example 2.
FIG. 12 is a top view of FIG. 11;
FIG. 13 is a side view of FIG. 12;
FIG. 14 is an enlarged view of a main part of FIG. 11;
FIG. 15 is an essential part longitudinal cross sectional view showing a thickness state of the example.
FIG. 16 is a longitudinal sectional view of a main part showing a thickness state of Comparative Examples 1 and 2.
FIG. 17 is a photograph showing a residual stress state in the example.
FIG. 18 is a photograph showing the residual stress of Comparative Example 2.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Contents 2 Blister pack part 3 Streamline part 4 Opening 5 Seal material 6 Die 7 Sheet material 9 Space 10 Thin part 11 Depression 12 Thickness difference

Claims (1)

A blister pack characterized in that the blister pack is curved from the top to the bottom.

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