【考案の詳細な説明】[Detailed description of the invention]
（産業上の利用分野）
本考案は、一端部分を周知手段により加熱し挾
圧持して周知形状の底部が形成されるプラスチツ
ク製胴部を有し、美顔用パツク剤が充填されるチ
ユーブ容器に関する。
（従来技術とその問題点）
プラスチツク製のチユーブ容器は化粧品等の容
器として広く使用されている。そして、この胴部
は単層であり、プラスチツク材としては、化粧品
容器として求められる表面光沢や印刷性に優れ、
かつ柔軟性が高く押し出しが容易な低密度ポリエ
チレンが使用されている。
ところで、上記のプラスチツク製チユーブ容器
を美顔用パツク剤用として適用できるかを確認す
るために、促進試験として、従来、化粧品容器と
して使用されている低密度ポリエチレン製の単層
チユーブ容器20個に、美顔用パツク剤を充填密封
し、50℃の恒温貯蔵試験を行つたところ、25日後
に13個、33日後には20個全部のチユーブ容器の底
部からパツク剤の漏出が見られた。而して、上記
試験において漏出を生じた個所は、第３図に示す
ように、加熱、挾圧持されて接合した部分と接合
されない部分との境界線２６から始まり、上記接
合部分側に向つて僅かに進みつつ接合部分の外面
に達している破断個所２７であつた。なお、第３
図に断面で示すチユーブ容器の底部は、周知の底
部の形状であり、この底部は適宜手段で胴部とな
る中空円筒体の一端部分を加熱し、平板上に歯を
設けたラツク状の１組の挾持板を、互に凸部と凸
部、凹部と凹部をそれぞれ対向させて前記一端部
分を挾圧持して形成したものであり、２１は、当
該挾圧持した際に挾持板から押し出され胴部端に
形成された押し出され部分、２２，２２′は挾圧
持時に上記押し出され部分２１と反対方向に押し
出され形成された突出部、２３，２３′は前記挾
持板の凹部部分で挾圧され形成された山部分、２
５，２５′は挾持板の凸部分で挾圧され形成され
た谷部分である。前記の底部の接合部分は、交互
に上記の山部分、谷部分を有して成り、破断個所
２７は接合部分と接合されてない部分の境界線２
６から上記突出部２２と谷部分２５との境附近に
延びていた。
本考案は、従つて美顔用パツク剤を充填し、密
封した後、長時間貯蔵しても美顔用パツク剤が漏
洩せず、表面光沢、印刷性に優れ、押し出し容易
なプラスチツク製チユーブ容器を提供することを
目的とする。
なお、プラスチツク製のチユーブ容器には、積
層胴部を有するものが知られているが、従来の積
層胴部は、例えば歯磨き容器として使用されてい
るように、香りの透過防止や水分の透過防止等を
目的とするものや外表面の印刷性向上を目的とす
るものであり、加熱し挾圧持して形成した底部か
らの漏出防止を目的としたものは知られてない。
（考案の構成）
本考案は、上記の目的を達成するために、胴部
が、低密度ポリエチレンから成る外層と高密度ポ
リエチレンから成る内層とから成り、かつ、上記
外層厚さと内層厚さの比が３〜７：７〜３である
構成を具備する。
本考案のチユーブ容器が上記の構成を具備する
理由は、以下に述べる実験結果に基づく。
即ち低密度ポリエチレンから成る外層厚さを高
密度ポリエチレンから成る内層厚さの合計が従来
の単層胴部厚さに等しく、かつ内、外層の厚さの
比を１：９から９：１まで段階的に変えた胴部を
有するチユーブ容器を製作し、これらチユーブ容
器に美顔用パツク剤を充填した後、胴部の端部を
常法により加熱挾圧持して密封し、密封したチユ
ーブ容器を50℃の恒温室に35日間貯蔵する促進試
験を行い、かつ胴部の表面光沢について低密度ポ
リエチレン単層チユーブ容器の胴部と目視比較を
行ない、次の表を得、外層厚さと内層厚さの比が
３〜７：７〜３のものは貯蔵試験期間中に漏洩せ
ず、しかも表面光沢が低密度ポリエチレン単層の
ものと同等であることが判明したことによる。
(Industrial Application Field) The present invention is a tube container that is filled with a facial mask and has a plastic body whose one end is heated by a known means and then clamped to form a bottom of a known shape. Regarding. (Prior art and its problems) Plastic tube containers are widely used as containers for cosmetics and the like. The body is single-layered, and as a plastic material, it has excellent surface gloss and printability, which are required for cosmetic containers.
Low-density polyethylene is used because it is highly flexible and easy to extrude. By the way, in order to confirm whether the above-mentioned plastic tube containers can be used for facial cosmetics, as an accelerated test, 20 single-layer tube containers made of low-density polyethylene, which are conventionally used as cosmetic containers, were When a facial mask was filled and sealed and subjected to a constant temperature storage test at 50°C, leakage of the pack was observed from the bottom of 13 tube containers after 25 days and all 20 tubes after 33 days. As shown in FIG. 3, the area where leakage occurred in the above test started from the boundary line 26 between the heated, clamped and joined part and the unjoined part, and started from the boundary line 26 toward the joined part. This was the fracture point 27, which had progressed slightly and reached the outer surface of the joint portion. In addition, the third
The bottom of the tube container shown in cross section in the figure has a well-known bottom shape, and this bottom is made by heating one end of a hollow cylindrical body, which becomes the body, by an appropriate means, and forming a rack-shaped one with teeth on a flat plate. A set of clamping plates is formed by sandwiching and pressing the one end portion with the convex portion and the convex portion facing each other, and the concave portion and the concave portion, respectively, and 21 indicates that when the clamping plate is clamped, The extruded parts 22 and 22' are extruded parts formed at the end of the body, and the protrusions 23 and 23' are the concave parts of the clamping plate, which are extruded in the opposite direction to the extruded part 21 during clamping. The mountain portion formed by being compressed with
5 and 25' are valley portions formed by being clamped and pressed by the convex portions of the clamping plates. The bottom joint part has the above-mentioned peak parts and valley parts alternately, and the breaking point 27 is the boundary line 2 between the joint part and the unjoined part.
6 to the vicinity of the boundary between the protruding portion 22 and the valley portion 25. Therefore, the present invention provides a plastic tube container that does not leak the facial mask even if stored for a long time after being filled with a facial mask and sealed, has excellent surface gloss and printability, and is easy to extrude. The purpose is to Note that some plastic tube containers are known to have a laminated body, but the conventional laminated body is designed to prevent scent and moisture from permeating, as is used for toothpaste containers, for example. etc., and those aimed at improving the printability of the outer surface, and there are no known ones aimed at preventing leakage from the bottom formed by heating and clamping. (Structure of the invention) In order to achieve the above-mentioned object, the present invention has a body comprising an outer layer made of low-density polyethylene and an inner layer made of high-density polyethylene, and the ratio of the outer layer thickness to the inner layer thickness is has a configuration in which the ratio is 3-7:7-3. The reason why the tube container of the present invention has the above configuration is based on the experimental results described below. That is, the total thickness of the outer layer made of low-density polyethylene and the inner layer made of high-density polyethylene is equal to the thickness of the conventional single-layer body, and the ratio of the thicknesses of the inner and outer layers is from 1:9 to 9:1. Tube containers having body portions that are changed in stages are manufactured, and after filling these tube containers with a facial mask, the ends of the body portions are sealed by heating and pressing in a conventional manner, thereby producing a sealed tube container. An accelerated test was carried out in which the material was stored in a constant temperature room at 50℃ for 35 days, and the surface gloss of the body was visually compared with the body of a low-density polyethylene single-layer tube container.The following table was obtained, and the outer layer thickness and inner layer thickness were This is because it was found that those with a ratio of 3 to 7:7 to 3 did not leak during the storage test period, and the surface gloss was equivalent to that of a single layer of low-density polyethylene.
【表】
なお、本考案において低密度ポリエチレンには
変性低密度ポリエチレンが含まれる。
次に本考案の１実施例について述べる。第１図
は、本考案チユーブ容器の一部破断側面図、第２
図は第１図のＡ−Ａ断面拡大図である。
先づ、第１図において、１は注出口部２を含む
頭部、３はその一端４に該頭部１が溶着されてい
て、高密度ポリエチレンから成る内層６と低密度
ポリエチレンから成る外層７とから成る２層胴
部、５は該胴部３の他端を加熱し挾圧持して閉鎖
し形成した底部である。
本具体例では、バリソン押出し成形機により、
中空円筒体の２層を積層状態で同時に押し出し成
形したバリソンを適宜長さに切断し、この切断し
た中空円筒体の一端に頭部１を射出成形と同時に
溶着したものを用いた。
中空円筒体は他の手段、例えば積層シートをま
るめて成形する等の手段によつて成形したもので
もよく、頭部と胴部との接合を他の手段で行つた
ものでもよい。
底部形成には、加熱し挾圧持することが必須要
件とするが、その加熱手段には、ガス火焔、誘導
加熱等適宜な手段を使用してよい。
次に第２図で、１１は前記挾持板で胴部の一端
部分を加熱し挾圧持した時に、胴部端方向に押し
出された内層部分、１２，１２′は該挾圧持時に
内層の押し出され方向と反対方向に押し出され形
成された外層突出部、１３，１３′は挾圧持部分
１４（第１図）のうち、挾持板の凹部部分で挾圧
持され形成された山の部分、１５，１５′は挾持
板の凸部部分で挾圧持され形成された谷の部分で
ある。挾圧持部分１４を含む上記形状の底部５を
もつチユーブ容器の内、外層の厚さの比を約６：
４とし、合計厚さを低密度ポリエチレン単層の容
器の胴部厚さと等しい約0.46mmとした。
このチユーブ容器20個に、前記と同じ美顔用パ
ツク剤を充填し密封して、50℃の恒温室に貯蔵し
漏洩の有無を調べた。その結果、貯蔵開始から33
日後まで漏洩したものは１個もなかつた。
（考案の効果）
本考案のチユーブ容器は、胴部が、低密度ポリ
エチレンから成る外層と高密度ポリエチレンから
成る内層とから成り、かつ上記外層厚さと内層厚
さの比が３〜７：７〜３である構成を具備してい
るので、胴部の内、外層合計厚さを単層チユーブ
容器の胴部厚さと等しくしても、美顔用パツク剤
を充填密封し、長期間貯蔵しても漏洩するものを
生じることがなく、表面光沢も低密度ポリエチレ
ン単層のものと同等の光沢を有すし、さらに印刷
性、押し出し容易さにおいても単層のものと実質
的に変りがないという諸効果を奏する。[Table] Note that in the present invention, low-density polyethylene includes modified low-density polyethylene. Next, one embodiment of the present invention will be described. Figure 1 is a partially cutaway side view of the tube container of the present invention;
The figure is an enlarged cross-sectional view taken along the line AA in FIG. 1. First, in FIG. 1, 1 is a head including a spout 2, 3 is a head 1 welded to one end 4, an inner layer 6 made of high-density polyethylene, and an outer layer 7 made of low-density polyethylene. 5 is a bottom portion formed by heating and pressing the other end of the body 3 to close it. In this specific example, using a balisong extrusion molding machine,
A balisong made by simultaneously extruding two layers of hollow cylindrical bodies in a laminated state was cut to an appropriate length, and a head 1 was welded to one end of the cut hollow cylindrical body at the same time as the injection molding. The hollow cylindrical body may be formed by other means, such as rolling a laminated sheet into a ball, or the head and body may be joined by other means. Although heating and clamping are essential for forming the bottom, any appropriate heating means such as a gas flame or induction heating may be used. Next, in FIG. 2, reference numeral 11 indicates an inner layer portion pushed out toward the end of the body when one end portion of the body is heated and clamped with the clamping plate, and 12 and 12' are inner layer portions that are pushed out toward the end of the body when the clamping plate heats and clamps one end of the body. Outer layer protrusions 13 and 13' formed by being extruded in a direction opposite to the extrusion direction are mountain portions of the clamping and pressing portion 14 (Fig. 1) formed by being clamped and pressed in the concave portion of the clamping plate. , 15, 15' are valley portions formed by being clamped and pressed by the convex portions of the clamping plates. The thickness ratio of the inner and outer layers of the tube container having the bottom portion 5 of the above shape including the clamping portion 14 is approximately 6:
4, and the total thickness was about 0.46 mm, which is equal to the body thickness of a single-layer low-density polyethylene container. Twenty tube containers were filled with the same facial mask as described above, sealed, and stored in a constant temperature room at 50° C. to check for leakage. As a result, 33
Not a single one had leaked until days later. (Effects of the invention) The tube container of the invention has a body comprising an outer layer made of low density polyethylene and an inner layer made of high density polyethylene, and the ratio of the outer layer thickness to the inner layer thickness is 3 to 7:7 to 7. 3, so even if the total thickness of the inner and outer layers of the body is equal to the thickness of the body of a single-layer tube container, it can be filled with a facial mask and sealed and stored for a long time. It does not leak anything, has a surface gloss equivalent to that of a single layer of low-density polyethylene, and has the same printability and ease of extrusion as a single layer. play.
【図面の簡単な説明】[Brief explanation of the drawing]
第１図は、本考案容器の一部破断側面図、第２
図は、第１図Ａ−Ａ断面拡大図、第３図は、単層
チユーブ容器における第２図類似の底部断面拡大
図。
図中、Ｔはチユーブ容器、１は頭部、３は胴
部、５は底部、６は内層、７は外層である。
Figure 1 is a partially cutaway side view of the container of the present invention;
The figures are an enlarged sectional view taken along the line A-A in Fig. 1, and Fig. 3 is an enlarged sectional view of the bottom of a single-layer tube container similar to Fig. 2. In the figure, T is a tube container, 1 is a head, 3 is a body, 5 is a bottom, 6 is an inner layer, and 7 is an outer layer.