JP3670605B2 - Ruled sheet and case using the same - Google Patents

Description

折強度率
本実施例において、折強度（Ｎ）とは、シートが折れ曲がった時の強度をいい、折強度率（％）とは、罫線加工後のシートの折強度（Ｎ）／罫線加工前のシートの折強度（Ｎ）をいうものとする。
【００２３】
折強度測定法
本実施例において、折強度は、罫線部を中心として５ｃｍ×１０ｃｍのシートを切り出し、サンプルの片側を水平に固定し、もう片側を幅方向中央（端より２５ｍｍ）、罫線部より１７±２ｍｍの位置を中心に加圧し、その時の押し圧強度をプッシュプルゲージにて測定した。
（実施例１）
実施例１においては、図１に示すようなシートを用いて、セロハン４１〜４３の３層を接着剤で多層に貼り合わせて、その両面にポリプロピレン２、３を貼り合わせて、シート全厚みが２６５μｍのシートを作成した。
【００２４】
第１層（符号２）は、１個ケースの最外層の一層をなし、樹脂としてポリプロピレン（商品名：「スーパーソフティ」、出光ユニテック製、引張破断伸度＝５３０％）を使用した。第２層（符号４１）は、樹脂としてセロハン（商品名：普通セロハンＰＬ＃５００、二村化学工業製、引張破断伸度＝２６％）を使用した。また、第３層（符号４２）、第４層（符号４３）は、第２層（符号４１）と同様に樹脂としてセロハンを使用した。第５層（符号３）は、１個ケースの最外層の一層をなし、第１層（符号２）と同様の樹脂を使用した。シートの各層の厚みは、第１層が８０μｍ、第２層が３５μｍ、第３層が３５μｍ、第４層が３５μｍ、第５層が８０μｍとした。
【００２５】
有機溶剤に溶融された接着材をグラビアロールコーティング法により塗布して、熱風乾燥後、第１層から第５層を貼り合わせて積層シートとしている。また、罫線加工においては、図２に示すように、最外層２のポリプロピレンが破断しないように、刃先が鋭角でない罫線刃６を用いて、ポリプロピレン２側から罫線刃６を押圧した。
【００２６】
その結果、最外層２、３は、破断することなく（連続状態）、中層４１、４２、４３のみが、それぞれ４１Ａ、４１Ｂ、４２Ａ、４２Ｂ、４３Ａ、４３Ｂに破断して、中層のみが破断した罫線加工部５を有する透明シートが形成された。このとき、加工条件は冷間で行ったが、罫線刃６を加熱して行うこともできる。このようにして得られた罫線入りシート１００を、図４に示すように、刃入れ側を外側にして罫線加工部５の部分で折り曲げたところ、良好な折り曲げ性が得られた。また、折り曲げ部において、５０回の繰り返し屈曲試験を実施したが、折り曲げ部を構成している第１層（符号２）、第５層（符号３）に全く破断は認められなかった。
（実施例２）
実施例２においては、図６に示すようなシートを用いて、セロハン４１〜４４の４層を接着剤で多層に貼り合わせて、その両面にポリプロピレン２、３を貼り合わせて、シート全厚みが３００μｍのシートを作成した。
【００２７】
第１層（符号２）は、１個ケースの最外層の一層をなし、樹脂としてポリプロピレン（商品名：「スーパーソフティ」、出光ユニテック製、引張破断伸度＝５３０％）を使用した。第２層（符号４１）は、樹脂としてセロハン（商品名：普通セロハンＰＬ＃５００、二村化学工業製、引張破断伸度＝２６％）を使用した。また、第３層（符号４２）、第４層（符号４３）、第５層（符号４４）は、第２層（符号４１）と同様に樹脂としてセロハンを使用した。第６層（符号３）は、１個ケースの最外層の一層をなし、第１層（符号２）と同様の樹脂を使用した。シートの各層の厚みは、第１層が８０μｍ、第２層が３５μｍ、第３層が３５μｍ、第４層が３５μｍ、第５層が３５μｍ、第６層が８０μｍのとした。
【００２８】
また、有機溶剤に溶融された接着材をグラビアロールコーティング法により塗布して、熱風乾燥後、第１層から第６層を貼り合わせて積層シートとしている。また、罫線加工においては、図２に示すように、最外層２のポリプロピレンが破断しないように、刃先が鋭角でない罫線刃６を用いて、ポリプロピレン２側から罫線刃６を押圧し罫線加工部５を形成した。こうして得られた罫線入り透明シートを、図４に示すように、刃入れ側を外側にして罫線加工部５の部分で折り曲げたところ、良好な折り曲げ性が得られた。また、得られたケース内に化粧品を入れ、同寸法の従来の罫線を有したＰＰクリアケースとの強度比較を行った結果、実用上では罫線加工部での破れや破損を生じることはなかった。
【００２９】
また、実施例２では、折強度率を測定したところ、罫線加工後のシートの折強度０．９（Ｎ）／罫線加工前のシートの折強度３．６（Ｎ）であったため、折強度率は２５（％）であった。このように折強度率は、５０％以下で、かつ１．０（Ｎ）以下であることが好ましい。
（実施例３）
実施例３においては、図５に示すようなシートを用いて、ポリ乳酸４の両面にポリプロピレン２、３を貼り合わせて、シート全厚みが３００μｍのシートを作成した。
【００３０】
第１層（符号２）は、１個ケースの最外層の一層をなし、樹脂としてポリプロピレン（商品名：「スーパーソフティ」、出光ユニテック製、引張破断伸度＝５３０％）を使用した。第２層（符号４）は、樹脂としてポリ乳酸（商品名：レイシア、三井化学製、引張破断伸度＝４．０％）を使用した。第３層（符号３）は、１個ケースの最外層の一層をなし、第１層（符号２）と同様の樹脂を使用した。シートの各層の厚みは、第１層が１００μｍ、第２層が１００μｍ、第３層が１００μｍとした。また、有機溶剤に溶融された接着材をグラビアロールコーティング法により塗布して、熱風乾燥後、第１層から第３層を貼り合わせて積層シートとしている。
【００３１】
また、罫線加工においては、図２に示すように、最外層２のポリプロピレンが破断しないように、刃先が鋭角でない罫線刃６を用いて、ポリプロピレン２側から罫線刃６を押圧した。その結果、最外層２、３は、破断することなく（連続状態）、中層４は破断して、中層のみが破断した罫線加工部を有する透明シートが形成された。こうして得られた罫線入りシートを、図４に示すように、刃入れ側を外側にして罫線加工部５の部分で折り曲げたところ、良好な折り曲げ性が得られた。また、得られたケース内に化粧品を入れ、同寸法の従来の罫線を有したＰＰクリアケースとの強度比較を行った結果、実用上では罫線加工部で破れや破損が生じることはなかった。
（実施例４）
実施例４においては、図１に示すようなシートを用いて、セロハン４１〜４３の３層を接着剤で多層に貼り合わせて、その両面にポリエチレンテレフタレート２、３を貼り合わせて、シート全厚みが２５５μｍのシートを作成した。
【００３２】
第１層（符号２）は、１個ケースの最外層の一層をなし、樹脂としてポリエチレンテレフタレート（商品名：「テフレックス」、帝人製、引張破断伸度＝５１％）を使用した。第２層（符号４１）は、樹脂としてセロハン（商品名：普通セロハンＰＬ＃５００、二村化学工業製、引張破断伸度＝２６％）を使用した。また、第３層（符号４２）、第４層（符号４３）は、第２層（符号４１）と同様に樹脂としてセロハンを使用した。第５層（符号３）は、１個ケースの最外層の一層をなし、第１層（符号２）と同様の樹脂を使用した。
【００３３】
シートの各層の厚みは、第１層が７５μｍ、第２層が３５μｍ、第３層が３５μｍ、第４層が３５μｍ、第５層が７５μｍとした。また、有機溶剤に溶融された接着材をグラビアロールコーティング法により塗布して、熱風乾燥後、第１層から第５層を貼り合わせて積層シートとしている。また、罫線加工においては、図２に示すように、最外層２のポリエチレンテレフタレートが破断しないように、刃先が鋭角でない罫線刃６を用いて、ポリエチレンテレフタレート２側から罫線刃６を押圧した。その結果、最外層２、３は、破断することなく（連続状態）、中層４１、４２、４３のみが、それぞれ破断して、中層のみが破断した罫線加工部５を有する透明シートが形成された。なお、図１１に示すように、最外層２のポリエチレンテレフタレートの引張破断伸度と中層４１、４２、４３の引張破断伸度とが非常に近いため、罫線加工部５を形成するのが困難であった。
【００３４】
こうして得られた罫線入りシートを、図４に示すように、刃入れ側を外側にして罫線加工部５の部分で折り曲げたところ、良好な折り曲げ性が得られた。
【００３５】
以上本発明の好ましい実施の形態について詳述したが、本発明は係る特定の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の要旨の範囲内において、種々の変形・変更が可能である。
【００３６】
【発明の効果】
以上詳述したところから明らかなように、本発明によれば、罫線加工部において中層が露出することがないので、見栄えがよく、層間剥離を起こすことのないシート及びこれを使用したケースを提供できる。
【図面の簡単な説明】
【図１】本実施の形態において用いたシートを示す図である。
【図２】本発明に係る罫線入りシートの罫線加工時の断面図である。
【図３】本発明に係る罫線入りシートの断面図である。
【図４】本発明に係る罫線入りシートに対して、折り曲げ加工したときの状態を示す図である。
【図５】本実施の形態において用いたシートを示す図である。
【図６】本実施の形態において用いたシートを示す図である。
【図７】本発明に係る罫線入りシートを用いた１個ケースを展開した様子を示した図である。
【図８】本発明に係る罫線入りシートを用いた１個ケースを組立てた図である。
【図９】従来における罫線加工時の断面を示す図である。
【図１０】従来の罫線入りシートを示した図である。
【図１１】引張破断伸度のグラフを示した図である。
【符号の説明】
１、１１、１２ シート
２、３ 最外層
４、４１、４２、４３、４４ 中層
５ 罫線加工部
１００ 罫線入りシート[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet with ruled lines in which a folding ruled line is formed and a case using the sheet.
[0002]
[Prior art]
Conventionally, various transparent packaging containers and the like have been manufactured by using a sheet on which a folding ruled line is formed and bending the sheet along the folding ruled line.
[0003]
FIG. 10 is a diagram showing an example of a conventional sheet with ruled lines. In the sheet 20, intermediate layers 231, 232 and 233 are laminated between outermost layers 21 and 22 provided on both outer sides. Further, the folding ruled line is usually composed of a ruled line processing portion 26 formed on the sheet 20 as shown in FIG. 10, and is formed over the entire width of the portion to be bent. Such a ruled line processing section 26 uses a ruled line blade 25 as shown in FIG. 9, sandwiches the sheet 20 between the ruled line blade 25 and a flat cradle (not shown), and is recessed in the thickness direction. It is formed by not.
[0004]
[Problems to be solved by the invention]
However, in the above-described sheet 20, after bending, as shown in FIG. 10, when the material used for the middle layers 231, 232, and 233 is a material that is weak against humidity, the middle layers 231, 232, and 233 of the sheet 20. However, there was a problem that mold and the like were generated because it was in direct contact with outside air, and the appearance was not good. Also, as shown in FIG. 10, in order to increase the strength of the entire sheet 20, a sheet is formed by laminating multiple layers. However, in the conventional sheet 20, the ruled line processing portion 26 is exposed to the outside. Therefore, there is a problem that the laminated sheets are peeled off (delamination).
[0005]
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a ruled sheet having a good appearance and no delamination, and a case using the same, which solves the problems of the prior art.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the ruled sheet according to claim 1 is a ruled sheet in which at least one middle layer is laminated between outermost layers provided on both outer sides, and the outermost layer comprises: It is made of a resin having a tensile breaking elongation higher than that of the middle layer alone, and has a ruled line portion for bending without breaking the outermost layer and breaking at least a part of the middle layer. It is characterized by.
[0007]
The ruled sheet according to claim 2 is characterized in that in the ruled sheet according to claim 1, the thickness of the entire sheet is 100 μm to 500 μm.
[0008]
The ruled sheet according to claim 3 is the ruled sheet according to claim 1 or 2, wherein the outermost layer is made of polypropylene, polyethylene or polyethylene terephthalate.
[0009]
A ruled sheet according to claim 4 is the ruled sheet according to any one of claims 1 to 3, wherein the middle layer is made of cellophane or polylactic acid.
[0010]
Furthermore, the case of Claim 5 uses the sheet | seat with a ruled line in any one of Claims 1 thru | or 4.
[0011]
According to the above invention, due to the difference in tensile rupture elongation between the outermost layer and the middle layer, only the middle layer is broken by applying the press groove processing, and the outermost layer is continuous without breaking. Therefore, by breaking only the middle layer, the folding strength is lowered, and a ruled line portion having good folding suitability is formed.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, in the present embodiment, a sheet 1 in which outermost layers 2 and 3 and intermediate layers 4 (41, 42, and 43) are laminated is used.
[0013]
As shown in FIG. 1, the outermost layers 2 and 3 of the sheet 1 used in the present invention need to use a resin having a tensile elongation at break higher than that of the middle layers 41, 42, and 43, The tensile breaking elongation of the outermost layer single bodies 2 and 3 in the sheet 1 is higher than the tensile breaking elongation of the middle layer single bodies 41, 42 and 43, preferably, the tensile breaking elongation of the outermost layer single bodies 2 and 3 is 200% or more, And it is preferable that the tensile breaking elongation of the middle layer single-piece | unit 41,42,43 is 200% or less.
[0014]
Here, it is necessary that the tensile rupture elongation of the outermost layer single bodies 2 and 3 is larger than the tensile rupture elongation of the middle layer single bodies 41, 42 and 43. If it is smaller than the tensile breaking elongation of 41, 42, 43, the outermost layers 2 and 3 break before the middle layer 4 at the time of ruled line processing, and a ruled line cannot be formed only on the middle layer 4. is there. Moreover, it is preferable that the tensile breaking elongation of the outermost layer simple substances 2 and 3 is 200% or more. If the breaking elongation of the outermost single layers 2 and 3 is less than 200%, the outermost layers 2 and 3 are It is because it becomes easy to break at the time of ruled line processing, and it becomes difficult to form a sheet with ruled lines.
[0015]
Thus, the outermost layers 2 and 3 of the sheet 1 may be any resin as long as it has a tensile elongation at break higher than the tensile break elongation of the middle layers 41, 42, and 43, such as polypropylene, Polyethylene or polyethylene terephthalate is used, and it is particularly preferable to use polypropylene having a high tensile elongation at break.
[0016]
Further, the middle layers 41, 42, 43 of the sheet 1 may be any resin as long as it has a tensile elongation at break lower than that of the outermost single layers 2, 3, such as cellophane or polylactic acid. Etc. can be used. Moreover, the sheet | seat with a ruled line of this invention should just be a 3 layer structure in which both outermost layers contain two layers and a middle layer contains one layer, and can arrange | position another layer in a middle layer as needed. For example, as shown in the sheet 11 shown in FIG. 5, the outermost layers 2 and 3 and the middle layer 4 (one layer) are laminated, or as the sheet 12 shown in FIG. What laminated | stacked the middle layer 4 (4 layers of 41, 42, 43, 44) can be used.
[0017]
Next, the ruled sheet according to the present invention will be specifically described. FIG. 2 is a cross-sectional view of the sheet with ruled lines according to the present invention at the time of ruled line processing. FIG. 3 is a cross-sectional view of the ruled sheet according to the present invention. Further, FIG. 4 is a diagram showing a state when the sheet with ruled lines according to the present invention is bent.
[0018]
As shown in FIGS. 2 to 4, the folding ruled line processing portion 5 provided on the sheet 1 is formed by applying the ruled line blade 6 from the outermost layer 2 side, and the thickness of the outermost layer 2 on the ruled line blade insertion side is as follows. When the ruled line blade 6 is pressed deeply and all the middle layers 41, 42, 43 are broken, the ruled line blade 6 is pressed to the depth of the outermost layer 3 on the side where the ruled line blade is not inserted, as shown in FIG. . Further, depending on the configuration of the sheet 1, the bending angle, the required bendability, and strength, only some of the intermediate layers 41, 42, 43 are broken, for example, only the middle layers 41, 42 are broken to form ruled lines. You may make it do.
[0019]
In FIG. 2, in order to break all the middle layers 41, 42, and 43, the ruled line blade 6 is pressed deeply to create the ruled line processing portion 5. As a result, as shown in FIG. 3, the outermost layers 2 and 3 are made of a resin having a higher elongation at break than the middle layers 41, 42 and 43, that is, a resin that extends better than the middle layer. Therefore, the outermost layers 2 and 3 are not broken (continuous state), and the middle layers 41, 42, and 43 are broken into middle layers 41A, 41B, 42A, 42B, 43A, and 43B, respectively, and only the middle layer is broken. A sheet 100 having the ruled line processing portion 5 was formed. The ruled sheet 100 can be folded in the opposite direction to the normal direction, that is, the outermost layer 2 side on the blade insertion side.
[0020]
FIG. 7 is a view showing a state in which one case using a ruled sheet according to the present invention is developed. Reference numeral 200 denotes a case, and a broken line 5 denotes a ruled line processing portion. FIG. 8 is an assembled view of a single case using a ruled sheet according to the present invention. When the ruled sheet 200 shown in FIG. 7 is assembled, the case 300 is completed.
【Example】
Hereinafter, the present invention will be described with reference to examples. In this embodiment, a case where a transparent sheet is used will be described. Moreover, the physical property measurement of the sheet | seat in the following Examples was performed with the following method.
[0021]
Tensile breaking elongation samples were cut into strips with a width of 10 mm, and the measurement length was set to 50 mm, which was stored on the chart paper with a tensile tester at a pulling speed of 100 mm / min. The distance between chucks at the time of sheet breakage was divided by the measured length to obtain the tensile break elongation (%). The tensile elongation at break obtained as described above is shown in Table 1 and FIG.
[0022]
[Table 1]

Folding strength rate In this example, the folding strength (N) means the strength when the sheet is bent, and the folding strength rate (%) means the folding strength (N) of the sheet after ruled line processing / before the ruled line processing. The folding strength (N) of the sheet.
[0023]
Folding strength measurement method In this example, the folding strength is determined by cutting a sheet of 5 cm × 10 cm around the ruled line part, fixing one side of the sample horizontally, and fixing the other side in the center in the width direction (25 mm from the end), from the ruled line part. Pressure was applied around a position of 17 ± 2 mm, and the pressing strength at that time was measured with a push-pull gauge.
(Example 1)
In Example 1, using a sheet as shown in FIG. 1, three layers of cellophane 41 to 43 are laminated together with an adhesive, and polypropylenes 2 and 3 are laminated on both sides thereof. A 265 μm sheet was prepared.
[0024]
The first layer (reference numeral 2) was one outermost layer of one case, and polypropylene (trade name: “Supersoft”, manufactured by Idemitsu Unitech, tensile elongation at break = 530%) was used as the resin. Cellophane (trade name: ordinary cellophane PL # 500, manufactured by Futamura Chemical Co., Ltd., tensile breaking elongation = 26%) was used for the second layer (reference numeral 41). The third layer (reference numeral 42) and the fourth layer (reference numeral 43) used cellophane as a resin as in the second layer (reference numeral 41). The fifth layer (reference numeral 3) is one outermost layer of one case, and the same resin as that of the first layer (reference numeral 2) is used. The thickness of each layer of the sheet was 80 μm for the first layer, 35 μm for the second layer, 35 μm for the third layer, 35 μm for the fourth layer, and 80 μm for the fifth layer.
[0025]
An adhesive material melted in an organic solvent is applied by a gravure roll coating method, dried with hot air, and then the first to fifth layers are bonded to form a laminated sheet. In the ruled line processing, as shown in FIG. 2, the ruled line blade 6 was pressed from the polypropylene 2 side by using the ruled line blade 6 having a sharp edge so that the polypropylene of the outermost layer 2 was not broken.
[0026]
As a result, the outermost layers 2 and 3 were not broken (continuous state), only the middle layers 41, 42, and 43 were broken into 41A, 41B, 42A, 42B, 43A, and 43B, respectively, and only the middle layer was broken. A transparent sheet having the ruled line processing portion 5 was formed. At this time, although the processing conditions were performed cold, it can also be performed by heating the ruled line blade 6. As shown in FIG. 4, when the sheet 100 with the ruled line obtained as described above was bent at the ruled line processed portion 5 with the blade insertion side facing outward, a good bendability was obtained. Further, the bending test was repeated 50 times in the bent portion, but no breakage was observed in the first layer (reference numeral 2) and the fifth layer (reference numeral 3) constituting the bent portion.
(Example 2)
In Example 2, by using a sheet as shown in FIG. 6, four layers of cellophane 41 to 44 are laminated together with an adhesive, and polypropylenes 2 and 3 are laminated on both sides thereof. A 300 μm sheet was prepared.
[0027]
The first layer (reference numeral 2) was one outermost layer of one case, and polypropylene (trade name: “Supersoft”, manufactured by Idemitsu Unitech, tensile elongation at break = 530%) was used as the resin. Cellophane (trade name: ordinary cellophane PL # 500, manufactured by Futamura Chemical Co., Ltd., tensile breaking elongation = 26%) was used for the second layer (reference numeral 41). The third layer (reference numeral 42), the fourth layer (reference numeral 43), and the fifth layer (reference numeral 44) were made of cellophane as a resin in the same manner as the second layer (reference numeral 41). The sixth layer (reference numeral 3) is the outermost layer of one case, and the same resin as that of the first layer (reference numeral 2) is used. The thickness of each layer of the sheet was 80 μm for the first layer, 35 μm for the second layer, 35 μm for the third layer, 35 μm for the fourth layer, 35 μm for the fifth layer, and 80 μm for the sixth layer.
[0028]
Moreover, the adhesive material melt | dissolved in the organic solvent is apply | coated by the gravure roll coating method, a hot air drying is performed, the 1st layer-the 6th layer are bonded together, and it is set as the lamination sheet. In the ruled line processing, as shown in FIG. 2, the ruled line blade 6 is pressed from the polypropylene 2 side by using the ruled line blade 6 whose blade edge is not acute so that the polypropylene of the outermost layer 2 does not break, and the ruled line processing unit 5 Formed. When the transparent sheet with ruled lines obtained in this way was bent at the ruled line processed portion 5 with the blade insertion side facing outward, as shown in FIG. 4, good bendability was obtained. Moreover, as a result of putting the cosmetics in the obtained case and comparing the strength with the PP clear case having the same ruled line of the same size, there was no practical breakage or breakage in the ruled line processed part. .
[0029]
In Example 2, the fold strength rate was measured, and the fold strength of the sheet after the crease line processing was 0.9 (N) / the fold strength of the sheet before the crease line processing was 3.6 (N). The rate was 25 (%). Thus, the bending strength rate is preferably 50% or less and 1.0 (N) or less.
(Example 3)
In Example 3, a sheet having a total sheet thickness of 300 μm was prepared by laminating polypropylene 2 and 3 on both sides of polylactic acid 4 using a sheet as shown in FIG.
[0030]
The first layer (reference numeral 2) was one outermost layer of one case, and polypropylene (trade name: “Supersoft”, manufactured by Idemitsu Unitech, tensile elongation at break = 530%) was used as the resin. For the second layer (reference numeral 4), polylactic acid (trade name: Lacia, manufactured by Mitsui Chemicals, tensile elongation at break = 4.0%) was used as the resin. The third layer (reference numeral 3) is the outermost layer of one case, and the same resin as the first layer (reference numeral 2) is used. The thickness of each layer of the sheet was 100 μm for the first layer, 100 μm for the second layer, and 100 μm for the third layer. Moreover, the adhesive material melt | dissolved in the organic solvent is apply | coated by the gravure roll coating method, and after drying with hot air, the 1st layer to the 3rd layer are bonded together to make a laminated sheet.
[0031]
In the ruled line processing, as shown in FIG. 2, the ruled line blade 6 was pressed from the polypropylene 2 side by using the ruled line blade 6 having a sharp edge so that the polypropylene of the outermost layer 2 was not broken. As a result, the outermost layers 2 and 3 were not broken (continuous state), the middle layer 4 was broken, and a transparent sheet having a ruled line processed portion in which only the middle layer was broken was formed. As shown in FIG. 4, when the sheet with the ruled line thus obtained was folded at the ruled line processed portion 5 with the blade insertion side facing outward, a good bendability was obtained. Moreover, as a result of putting cosmetics in the obtained case and comparing the strength with the PP clear case having the same ruled line of the same size, the ruled line processed part was not torn or damaged practically.
(Example 4)
In Example 4, using a sheet as shown in FIG. 1, three layers of cellophane 41 to 43 are laminated together with an adhesive, and polyethylene terephthalate 2 and 3 are laminated on both sides thereof to obtain the total thickness of the sheet. Produced a sheet of 255 μm.
[0032]
The first layer (reference numeral 2) was one outermost layer of one case, and polyethylene terephthalate (trade name: “Teflex”, manufactured by Teijin, tensile elongation at break = 51%) was used as the resin. Cellophane (trade name: ordinary cellophane PL # 500, manufactured by Futamura Chemical Co., Ltd., tensile breaking elongation = 26%) was used for the second layer (reference numeral 41). The third layer (reference numeral 42) and the fourth layer (reference numeral 43) used cellophane as a resin as in the second layer (reference numeral 41). The fifth layer (reference numeral 3) is one outermost layer of one case, and the same resin as that of the first layer (reference numeral 2) is used.
[0033]
The thickness of each layer of the sheet was 75 μm for the first layer, 35 μm for the second layer, 35 μm for the third layer, 35 μm for the fourth layer, and 75 μm for the fifth layer. Moreover, the adhesive material melt | dissolved in the organic solvent is apply | coated by the gravure roll coating method, and after drying with hot air, the 1st layer-the 5th layer are bonded together, and it is set as the lamination sheet. Further, in the ruled line processing, as shown in FIG. 2, the ruled line blade 6 was pressed from the polyethylene terephthalate 2 side using a ruled line blade 6 having a sharp edge so that the polyethylene terephthalate of the outermost layer 2 was not broken. As a result, the outermost layers 2 and 3 were not broken (continuous state), only the middle layers 41, 42, and 43 were broken, and a transparent sheet having the ruled line processed portion 5 in which only the middle layer was broken was formed. . As shown in FIG. 11, the tensile breaking elongation of the polyethylene terephthalate of the outermost layer 2 is very close to the tensile breaking elongation of the middle layers 41, 42, 43, so it is difficult to form the ruled line processed portion 5. there were.
[0034]
As shown in FIG. 4, when the sheet with the ruled line thus obtained was folded at the ruled line processed portion 5 with the blade insertion side facing outward, a good bendability was obtained.
[0035]
Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment, and various modifications are possible within the scope of the gist of the present invention described in the claims.・ Change is possible.
[0036]
【The invention's effect】
As is clear from the above detailed description, according to the present invention, since the middle layer is not exposed in the ruled line processed portion, it provides a good-looking sheet that does not cause delamination and a case using the sheet. it can.
[Brief description of the drawings]
FIG. 1 is a diagram showing a sheet used in the present embodiment.
FIG. 2 is a cross-sectional view of a sheet with ruled lines according to the present invention at the time of ruled line processing.
FIG. 3 is a cross-sectional view of a sheet with ruled lines according to the present invention.
FIG. 4 is a diagram showing a state when a ruled sheet according to the present invention is bent.
FIG. 5 is a diagram illustrating a sheet used in the present embodiment.
FIG. 6 is a diagram showing a sheet used in the present embodiment.
FIG. 7 is a view showing a state in which one case using a ruled sheet according to the present invention is developed.
FIG. 8 is an assembled view of a single case using a ruled sheet according to the present invention.
FIG. 9 is a diagram showing a cross-section during ruled line processing in the prior art.
FIG. 10 is a view showing a conventional sheet with ruled lines.
FIG. 11 is a graph showing a tensile elongation at break.
[Explanation of symbols]
1, 11, 12 Sheet 2, 3 Outermost layer 4, 41, 42, 43, 44 Middle layer 5 Ruled line processing section 100 Ruled sheet

Claims (5)

A ruled sheet in which at least one middle layer is laminated between outermost layers provided on both outer sides,
The outermost layer is made of a resin having a tensile elongation at break higher than that of the middle layer alone,
A sheet with ruled lines, comprising a ruled line portion for bending that is formed without breaking the outermost layer and breaking at least a part of the middle layer. The sheet with ruled lines according to claim 1,
A sheet with ruled lines, wherein the thickness of the entire sheet is 100 μm to 500 μm. In a ruled sheet according to claim 1 or 2,
The outermost layer is made of polypropylene, polyethylene, or polyethylene terephthalate, and is a ruled sheet. In the sheet with ruled lines according to any one of claims 1 to 3,
The middle layer is made of cellophane or polylactic acid, and is a ruled sheet.   A case using the sheet with ruled lines according to any one of claims 1 to 4.

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