JP5782007B2 - Processing method for reduced diameter part and ring-shaped enlarged part of drinking straw - Google Patents
Processing method for reduced diameter part and ring-shaped enlarged part of drinking straw Download PDFInfo
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- JP5782007B2 JP5782007B2 JP2012236476A JP2012236476A JP5782007B2 JP 5782007 B2 JP5782007 B2 JP 5782007B2 JP 2012236476 A JP2012236476 A JP 2012236476A JP 2012236476 A JP2012236476 A JP 2012236476A JP 5782007 B2 JP5782007 B2 JP 5782007B2
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Description
本発明は、プラスチック製飲料用ストローの一端側に縮径部を成形すると共に、この縮径部近くに略リング状の拡径部を更に一体成形する加工方法に関し、特には、二段式飲料用ストローの外管に、同じ金型で縮径部とリング状の拡径部を連続的に成形する加工方法に関する。 The present invention relates to a processing method for forming a reduced diameter portion on one end side of a plastic beverage straw and further integrally forming a substantially ring-shaped enlarged diameter portion near the reduced diameter portion, and in particular, a two-stage beverage. The present invention relates to a processing method for continuously forming a reduced diameter portion and a ring-shaped enlarged diameter portion on the outer tube of a drinking straw with the same mold.
従来、二段式飲料用ストローは伸縮自在な構成にするため、外管の一端側を縮径に形成し、伸長した際に内管が抜け落ちないようにしている。
他方、飲料用ストローを飲料容器に刺し込んで吸引すると、飲料容器内が減圧し容器が変形して飲みづらくなり、このため吸引を中断し再び吸引することを繰り返す不便があった。これを解決する手段として、近年飲料用ストローに溝や突状部あるいは端部に拡径部を設けて吸引の際に容器内に空気が入り、吸引がスムーズに行うことが種々行われている。
2. Description of the Related Art Conventionally, in order to make a two-stage beverage straw stretchable, one end side of an outer tube is formed with a reduced diameter so that the inner tube does not fall out when it is extended.
On the other hand, when the drinking straw is inserted into the beverage container and sucked, the inside of the beverage container is depressurized and the container is deformed and becomes difficult to drink. For this reason, there is an inconvenience that the sucking is interrupted and the sucking is repeated again. As means for solving this, various types of drinking straws have been recently performed in which a groove or a protruding portion or an enlarged diameter portion is provided at the end portion so that air enters the container at the time of suction and the suction is smoothly performed. .
この拡径部を有する飲料用ストローとしては、例えば、特許文献１（特開２００３−１３５２４２号公報）では、径の異なる２本以上の管が伸縮自在に組合わされ、前記管のうち、最も外側に位置する最外管が、断面円弧形の外周壁と、外周壁の長手方向に沿った１本以上の凸条とを有する多段式ストローが開示されている。これにより、吸引の際に、飲料容器が減圧にならず、飲みやすい効果を有する。 As a drinking straw having this enlarged diameter portion, for example, in Patent Document 1 (Japanese Patent Laid-Open No. 2003-135242), two or more tubes having different diameters are combined so as to be freely stretchable, and the outermost of the tubes. A multi-stage straw is disclosed in which the outermost tube located in the section includes an outer peripheral wall having an arc cross section and one or more ridges along the longitudinal direction of the outer peripheral wall. Thereby, at the time of suction | inhalation, it has the effect that a drink container does not become pressure reduction and is easy to drink.
また、ストローの端部を拡径するための製造装置としては、特許文献２（特開２００１−０５８３５１号公報）では、熱可塑性樹脂からなる長尺の筒状体の少なくとも一方の端部に、端部に向って内径及び外径を大きくした拡径部を設けた拡径ストロー管の製造装置であって、先端から基端に向って筒状体の内径よりも小さい径から筒状体の外径よりも大きい径まで拡径した拡径金型部と溝を有する段部とを有する拡径ストロー管の製造装置が開示されている。
これにより、製造する拡径ストロー管の壁圧を所望の座屈強度が得られる程度に厚くしても、外径が小さい部分で使用する材料の量は少なくて済む。したがって、軽量化とコストの削減を図ることができるというものである。
In addition, as a manufacturing apparatus for expanding the diameter of the end of the straw, in Patent Document 2 (Japanese Patent Laid-Open No. 2001-058351), at least one end of a long cylindrical body made of a thermoplastic resin, An apparatus for manufacturing a diameter-enlarged straw tube having an enlarged diameter part with an increased inner diameter and outer diameter toward an end, wherein the diameter of the cylindrical object is smaller than the inner diameter of the cylindrical object from the distal end toward the proximal end. An apparatus for manufacturing a diameter-expanded straw tube having a diameter-enlarged mold portion that is expanded to a diameter larger than the outer diameter and a step portion having a groove is disclosed.
Thus, even if the wall pressure of the diameter-enlarged straw tube to be manufactured is increased to such an extent that a desired buckling strength can be obtained, the amount of material used in the portion having a small outer diameter can be reduced. Therefore, weight reduction and cost reduction can be achieved.
上記従来の二段式飲料用ストローにおいては、その外管には、その一端側を縮径し縮径部を形成し、更に、外管に突状部や拡径部を別々に加工していたので、それらの金型も別々に必要となり、工程数も多くなって手間を要し、そのため加工費用が増加する問題点を有していた。 In the above-mentioned conventional two-stage beverage straw, the outer tube is reduced in diameter on one end side to form a reduced diameter portion, and the protruding portion and the expanded diameter portion are processed separately in the outer tube. Therefore, these dies are also required separately, and the number of processes is increased, which requires time and effort, and thus has a problem of increasing processing costs.
また、飲料用ストローに溝や突状部を形成するのは、それがストローの端部、あるいは外周であっても、ストローの長手方向に凸部や溝を形成するものであり、その加工方法は比較的に容易である。
即ち、特許文献１のものでは、ストローの長手方向に凸条を加工するのに、ストロー内に刺し込んだ雄型ロッドは凸条を成形後に、凸条が長手方向に成形したものであるから、凸状が形成された雄型ロッドであっても、凸状を成形後に雄型ロッドをストロー内から比較的容易に引き出せるので、加工上大きな問題もなく、他方特許文献２の場合にも、ストローの端部を拡径するものであるから、金型をストローの端部に押し込んでも極めて容易に金型を外すことができ、加工が容易である。
In addition, the grooves and protrusions are formed in the drinking straw by forming the protrusions and grooves in the longitudinal direction of the straw, even if it is the end or outer periphery of the straw. Is relatively easy.
That is, in the thing of patent document 1, in order to process a protruding item | line in the longitudinal direction of a straw, since the male rod stabbed in the straw formed a protruding item | line, the protruding item | line was shape | molded in the longitudinal direction. Even in the case of a male rod having a convex shape, since the male rod can be pulled out from the straw relatively easily after the convex shape is formed, there is no major problem in processing. Since the diameter of the end of the straw is increased, the mold can be removed very easily even if the mold is pushed into the end of the straw, and the processing is easy.
しかしながら、図６に示すように、ストローの中間に略リング状の拡径部（１a）を形成する場合においては、拡径部（１a）がリング状であるから、その拡径部（１a）を成形する金型ロッドをストロー内に挿入することが極めて難しく、例え金型ロッドが挿入されたとしても、拡径部（１a）の成形後に、ストローから金型ロッドを引き抜くことが困難となり、ストロー内に金型ロッドを挿入した加工には無理が生じ、これらを解決するには、複雑な金型ロッドが必要となり、多大な費用を要する問題点があった。 However, as shown in FIG. 6, when the substantially ring-shaped enlarged diameter portion (1a) is formed in the middle of the straw, the enlarged diameter portion (1a) is ring-shaped, and therefore the enlarged diameter portion (1a). It is very difficult to insert the mold rod into the straw, and even if the mold rod is inserted, it is difficult to pull out the mold rod from the straw after forming the enlarged diameter portion (1a). The process of inserting the mold rod into the straw is unreasonable, and in order to solve these problems, a complicated mold rod is required, and there is a problem that requires a large amount of cost.
本発明は、複雑な加工金型や工程を要することなく、一つの金型でもって、ストローの一端側を縮径部に成形すると共に、連続してこの縮径部の近くに略リング状の拡径部を更に一体成形できる飲料用ストローの縮径部及びリング状拡径部の加工方法を提供することを目的とする。 According to the present invention, one end of the straw is formed into a reduced diameter portion with a single mold without requiring a complicated working die or process, and a substantially ring shape is continuously formed near the reduced diameter portion. It aims at providing the processing method of the diameter-reduced part of a drinking straw and the ring-shaped diameter-expanded part which can form an expanded-diameter part further integrally.
本発明の他の目的は、略リング状の拡径部（１a）を成形するのに、加工金型がシンプルで、しかもストロー内に挿入する部分の金型に拡径部（１a）を形成するための凸状部を必要とせず、加工金型の挿入及び抜き差しが極めて簡単な飲料用ストローのリング状拡径部の加工方法を提供するにある。 Another object of the present invention is to form a substantially ring-shaped enlarged-diameter portion (1a), with a simple working mold, and to form an enlarged-diameter portion (1a) in the portion of the mold to be inserted into the straw. The present invention provides a method for processing a ring-shaped enlarged portion of a drinking straw, which does not require a convex portion for the purpose, and is extremely easy to insert and remove a processing mold.
上記課題を解決するために、本発明は、飲料用ストロー（１）の一端側に縮径部（1b）を成形すると共に、連続してこの縮径部（1b）近くに略リング状の拡径部（1a）を更に一体成形する加工方法であって、挿入穴（21a）が穿設された先端面をテーパー状の成形部（21b）に形成した丸棒状の金型本体（21）と、該金型本体（21）に前記挿入穴（21a）と同芯状で固定されると共に、細軸部（22a）の先端が前記成形部（21b）より突出させた段付きピン中子（22）とから成り、且つ、前記挿入穴（21a）の内周面（21c）と前記細軸部（22a）との間に間隙部（23）を有する成形金型（２）を用い、先ず、予め加熱された前記成形金型（２）あるいは前記飲料用ストロー（１）を移動し、前記飲料用ストロー（１）の一端を前記成形部（21b）に当接させながら間隙部（23）に挿入し前記成形金型（２）の段部（22ｂ）まで押し込んで前記縮径部（1b）を成形し、更に一定量押し込み前記成形部（21b）でもって、前記飲料用ストロー（１）の前記縮径部（1b）近くに略リング状の前記拡径部（1a）を成形させたことを特徴とする。 In order to solve the above-mentioned problems, the present invention forms a reduced diameter portion (1b) on one end side of a drinking straw (1) and continuously expands in a substantially ring shape near the reduced diameter portion (1b). A round bar-shaped mold body (21) in which a distal end surface with an insertion hole (21a) formed in a tapered molded part (21b) is a processing method for further integrally molding the diameter part (1a). The stepped pin core (15) is fixed to the mold body (21) concentrically with the insertion hole (21a), and the tip of the thin shaft portion (22a) protrudes from the molding portion (21b). 22) and having a gap portion (23) between the inner peripheral surface (21c) of the insertion hole (21a) and the thin shaft portion (22a), While moving the pre-heated molding die (2) or the drinking straw (1) and bringing one end of the drinking straw (1) into contact with the molding part (21b) Insert into the gap part (23) and push into the step part (22b) of the molding die (2) to form the reduced diameter part (1b), and then push in a certain amount to form the beverage with the molding part (21b). A substantially ring-shaped enlarged diameter portion (1a) is formed near the reduced diameter portion (1b) of the drinking straw (1).
また、前記金型本体（21）の前記成形部（21b）のテーパー角（θ）が、６０度〜１３０度の範囲である前記成形金型（２）を使用するのが好ましい。 Moreover, it is preferable to use the said shaping | molding die (2) whose taper angle ((theta)) of the said shaping | molding part (21b) of the said mold main body (21) is the range of 60 degree | times-130 degree | times.
本発明の飲料用ストローは、プラスチック製の１本又は２段式ストローを含み、特には、２段式ストローの外管を加工対象とするものである。 The drinking straw of the present invention includes a plastic one-stage or two-stage straw, and in particular, an outer tube of the two-stage straw.
本発明は飲料用ストロー（１）あるいは成形金型（２）のいずれかを移動させ、飲料用ストロー（１）の端部を成形金型（２）の成形部（21b）に当接させながら、成形金型（２）の段部（22b）まで押し込んで縮径部（1b）を成形し、連続して更に一定量押し込んで略リング状の拡径部（1a）を成形する加工方法であり、飲料用ストロー（１）を一つの成形金型（２）に押し込むだけで、飲料用ストロー（１）の一端に縮径部（1b）と、その一端近くに略リング状の拡径部（1a）との両方が容易に成形でき、従来のように飲料用ストロー（１）の外側から押圧する別な金型も不要であるから、加工に要する時間が極めて短く、製造のスピード化をもたらすと共に金型の故障もなくコスト低減を成す。 In the present invention, either the beverage straw (1) or the molding die (2) is moved and the end of the beverage straw (1) is brought into contact with the molding portion (21b) of the molding die (2). In the processing method of forming the reduced diameter part (1b) by pushing into the step part (22b) of the molding die (2), and then forming a substantially ring-shaped enlarged diameter part (1a) by pushing in a certain amount continuously. Yes, just by pushing the drinking straw (1) into one mold (2), the drinking straw (1) has a reduced diameter portion (1b) at one end and a substantially ring-shaped enlarged diameter portion near one end. (1a) can be easily molded, and there is no need for a separate mold to press from the outside of the drinking straw (1) as in the past, so the time required for processing is extremely short and the production speed is increased. The cost is reduced without any failure of the mold.
また、本発明の加工方法においては、先端面をテーパー状の成形部（21b）に形成した丸棒状の金型本体（21）と、細軸部（22a）の先端が前記成形部（21b）より突出させた段付きピン中子（22）とから成り、且つ、前記挿入穴（21a）の壁面（21c）と前記細軸部（22a）との間に間隙部（23）を形成する成形金型（２）を使用するため、この加熱状態な成形金型（２）の成形部（21b）に飲料用ストロー（１）の端部を当接しながら押し込むと、その端部が軟化してテーパー状の成形部（21b）に沿って徐々に縮径をしながら、間隙部（23）内に押し込まれる。やがて、その端部が段付きピン中子（22）の段部（22b）に当接した状態では、間隙部（23）内に飲料用ストロー（１）の縮径された端部側が隙間なく入り込み、正確な縮径部（1b）を成形することができる。
この状態の飲料用ストロー（１）を更に一定量押し込むと、飲料用ストロー（１）は、その外周が規制されず加熱された成形部（21b）の部分で略リング状に盛り上り、飲料用ストロー（１）の一端近くに飲料用ストロー（１）の外径よりも大きな径の拡径部（1a）が容易に一体成形される。
つまり、本発明では、成形部（21b）でもって縮径部（1b）と拡径部（1a）の成形を行うことができるため、金型の簡素化が容易となり、且つ、加工の容易化を成す点に特徴を有する。
この際に成形部（21b）のテーパー面でもって、拡径部（1a）の形状を整えると共に、テーパー面の角度（θ）及び押し込量を変えることにより拡径部（1a）の形状及び高さを自由に調節することができる。
Further, in the processing method of the present invention, a round bar-shaped mold body (21) whose tip surface is formed into a tapered molding part (21b) and the tip of the thin shaft part (22a) are the molding part (21b). Molding comprising a stepped pin core (22) projecting more and forming a gap (23) between the wall surface (21c) of the insertion hole (21a) and the thin shaft portion (22a) Since the mold (2) is used, when the end of the drinking straw (1) is pushed into the molded part (21b) of the heated mold (2) while being pressed, the end softens. The taper is pushed into the gap (23) while gradually reducing the diameter along the tapered shaped part (21b). Eventually, in a state where the end portion is in contact with the stepped portion (22b) of the stepped pin core (22), the end portion of the beverage straw (1) having a reduced diameter is not left in the gap portion (23). It is possible to form an accurate reduced diameter portion (1b).
When a certain amount of the drinking straw (1) in this state is pushed in further, the drinking straw (1) rises in a substantially ring shape at the portion of the molded part (21b) that is heated without being regulated in its outer periphery. An enlarged diameter portion (1a) having a diameter larger than the outer diameter of the drinking straw (1) is easily integrally formed near one end of the straw (1).
In other words, in the present invention, since the reduced diameter portion (1b) and the enlarged diameter portion (1a) can be formed by the molded portion (21b), the die can be simplified and the processing can be facilitated. It has the feature in the point which comprises.
At this time, the shape of the enlarged diameter portion (1a) is adjusted by the tapered surface of the molded portion (21b), and the shape of the enlarged diameter portion (1a) is changed by changing the angle (θ) and the pushing amount of the tapered surface. The height can be adjusted freely.
更に、本発明では、成形金型（２）が、その軸方向に凹凸がないため、加工の際、飲料用ストロー（１）に押し込んだり、抜き出すのが極めて簡単となる。 Furthermore, in the present invention, since the molding die (2) has no irregularities in its axial direction, it is very easy to push and extract it into the drinking straw (1) during processing.
以下、図を基に本発明の飲料用ストローに縮径部（1b）及び略リング状の拡径部（1a）を一体成形する加工方法について説明する。 Hereinafter, a processing method for integrally forming the reduced diameter portion (1b) and the substantially ring-shaped enlarged diameter portion (1a) in the beverage straw of the present invention will be described with reference to the drawings.
先ず、本発明の加工方法に使用する成形金型（２）について、図２〜図５を基に説明する。この成形金型（２）は基本的に外側の金型本体（21）とその中に嵌着した段付きピン中子（22）とから成る。 First, the molding die (2) used for the processing method of the present invention will be described with reference to FIGS. This molding die (2) basically comprises an outer die body (21) and a stepped pin core (22) fitted therein.
金型本体（21）は、図２の如く、金属製の丸棒状で、その先端面に挿入穴（21a）を穿設すると共に，肉厚筒状な先端側の先端面を、その中心に向けて凹ませ、断面がテーパー面の成形部（21b）に形成したものである。つまり、成形部（21b）は外周に向かって広がるラッパ状である。
前記挿入穴（21a）の穴径は、飲料用ストロー（１）の縮径部（1b）外径とほぼ同一で、縮径部（1b）が隙間なく容易に挿入できる大きさである。
前記成形部（21b）のテーパー面の角度（θ）は、６０度〜１３０度の範囲で、より好ましくは９０度〜１１０度がよく、６０度以下では拡径部（1a）の外径がリング状に盛り上がらずなだらかな裾広がりとなり、拡径部（1a）の形成が難しく、他方、１３０度以上では、縮径部（1b）を成形する際に、飲料用ストロー（１）の端部を成形部（21b）に当接しながらし押し込んでも縮径されずに潰れた状態になり、縮径部（1b）を成形することができない。
As shown in FIG. 2, the mold body (21) is in the shape of a metal round bar, and has an insertion hole (21a) formed in the distal end surface thereof, and the distal end surface on the distal end side having a thick cylindrical shape. The concave portion is formed in the molded portion (21b) having a tapered surface in cross section. That is, the molding part (21b) has a trumpet shape extending toward the outer periphery.
The diameter of the insertion hole (21a) is almost the same as the outer diameter of the reduced diameter portion (1b) of the drinking straw (1), and the reduced diameter portion (1b) can be easily inserted without a gap.
The angle (θ) of the tapered surface of the molded part (21b) is in the range of 60 ° to 130 °, more preferably 90 ° to 110 °, and the outer diameter of the enlarged diameter portion (1a) is less than 60 °. It is difficult to form the enlarged diameter part (1a), and it is difficult to form the enlarged diameter part (1a) at the angle of 130 degrees or more, and the end part of the drinking straw (1) when molding the reduced diameter part (1b) Even if it is pressed in contact with the molding part (21b), it is crushed without being reduced in diameter, and the reduced diameter part (1b) cannot be molded.
そして、金型本体（21）に挿入する金属製の段付きピン中子（22）は、段部（22b）を境に、細い部分の細軸部（22a）と太い部分の基部（22c）とからなる丸棒状の段付きピンである。
この段付きピン中子（22）の基部（22c）側から金型本体（21）の挿入穴（21a）内に挿入し、金型本体（21）に基部（22c）側をスプリングピン（３）で同芯状に固定する。
この際に、細軸部（22a）と挿入穴（21a）の壁面（21c）との間には環状の間隙部（23）が形成され、しかも細軸部（22a）の先端側は成形部（21b）より突出している。
また、間隙部（23）の広さは、飲料用ストロー（１）の肉厚と略同等であり、しかも細軸部（22a）の外径が飲料用ストロー（１）の縮径部（1b）内径と略同等である。
従って、このように構成した成形金型（２）においては、飲料用ストロー（１）の加工した縮径部（1b）が間隙部（23）内に隙間なく容易に入り込めるようにしている。
And the metal stepped pin core (22) to be inserted into the mold body (21) has a thin shaft part (22a) and a thick base part (22c) with the step part (22b) as a boundary. This is a round bar-shaped stepped pin consisting of
The stepped pin core (22) is inserted into the insertion hole (21a) of the mold main body (21) from the base (22c) side, and the base (22c) side of the mold main body (21) is inserted into the spring pin (3 ) To fix it concentrically.
At this time, an annular gap portion (23) is formed between the thin shaft portion (22a) and the wall surface (21c) of the insertion hole (21a), and the distal end side of the thin shaft portion (22a) is a molded portion. Projected from (21b).
The width of the gap (23) is substantially the same as the thickness of the drinking straw (1), and the outer diameter of the thin shaft portion (22a) is the reduced diameter (1b) of the drinking straw (1). ) Almost the same as the inner diameter.
Therefore, in the molding die (2) configured as described above, the processed reduced diameter portion (1b) of the beverage straw (1) can easily enter the gap portion (23) without any gap.
次に、図１を基に、上記成形金型（２）を使用した縮径部（1b）及び拡径部(1a）の加工方法について、成形金型（２）の方を移動した場合について説明すると、成形金型（２）は、予め加熱装置（３）で約１１０℃〜１６０℃に加熱させておく。
図１（ａ）に示すように、この加熱された状態の成形金型（２）を移動させ最初に突出した細軸部（22a）を飲料用ストロー（１）の穴に挿入して押し込んでいくと、飲料用ストロー（１）の先端部が成形部（21b）に当接する。
更に成形金型（２）を押し込んでいくと、飲料用ストロー（１）の先端部側が成形部（21b）のテーパー面で縮径されながら、図１（ｂ）に示すように、成形金型（２）内の間隙部（23）内まで押し込まれ、やがて飲料用ストロー（１）の縮径された先端部が段部（22b）に当接し縮径部（1b）が成形される。
この当接した後、図１（ｃ）に示すように、更に成形金型（２）を一定量押し込むと、加熱され軟化した部分の飲料用ストロー（１）は、縮径部（1b）が間隙部（23）内では詰まった状態のため、成形部（21b）の所で外側にリング状に膨らんで盛り上がり、略リング状の拡径部（1a）が成形されるのである。
Next, based on FIG. 1, the processing method of the reduced diameter portion (1b) and the enlarged diameter portion (1a) using the molding die (2) is the case where the molding die (2) is moved. To explain, the mold (2) is preheated to about 110 ° C. to 160 ° C. by the heating device (3).
As shown in FIG. 1 (a), the heated mold (2) is moved, and the first protruding thin shaft portion (22a) is inserted into the hole of the beverage straw (1) and pushed in. Then, the tip of the drinking straw (1) comes into contact with the molded part (21b).
When the molding die (2) is further pushed in, the tip of the beverage straw (1) is reduced in diameter by the tapered surface of the molding portion (21b), as shown in FIG. 1 (b). (2) The inner end of the beverage straw (1) is pushed into the gap portion (23), and the reduced diameter tip portion of the beverage straw (1) comes into contact with the stepped portion (22b) to form the reduced diameter portion (1b).
After the contact, as shown in FIG. 1 (c), when the molding die (2) is further pushed in a certain amount, the softened portion of the drinking straw (1) has a reduced diameter portion (1b). Since it is clogged in the gap (23), it swells and rises outward in the form of a ring at the forming part (21b), and the substantially ring-shaped enlarged diameter part (1a) is formed.
この際に、拡径部（1a）は、テーパー面の成形部（21b）に添って盛り上がるので、その形状が整えられ、断面形状がきれいな山型に成形されるのである。
また、飲料用ストロー（１）に成形される拡径部（1a）の位置は、通常飲料用ストロー（１）の一端から約３ｍｍ〜４ｍｍ程度の所が飲料用ストロー（１）を飲料容器に刺し込んで吸引するのに好ましいが、本発明の加工方法では、成形金型（２）の成形部（21b）で成形されるため、この丁度良い位置に形成される。
更に、拡径部（1a）の高さは、飲料用ストロー（１）が段部（22b）に当接した後、更に飲料用ストロー（１）を一定量押し込む量で調整され、この押し込む量としては、例えば、外径が５ｍｍの飲料用ストロー（１）の場合、１ｍｍ〜３ｍｍの程度である。
尚、飲料用ストロー（１）に成形金型（２）を押し込む場合に、成形金型（２）は拡径部（1a）が成形されるまで連続して押し込まれる。そして、拡径部（1a）が成形された後に、成形金型（２）を飲料用ストロー（１）から抜き出せばよい。
At this time, the enlarged diameter portion (1a) rises along the tapered surface forming portion (21b), so that the shape thereof is adjusted and the cross-sectional shape is formed into a clean mountain shape.
Moreover, the position of the diameter-expansion part (1a) shape | molded on the drinking straw (1) is a place about 3 mm-4 mm from the end of the drinking straw (1) normally, and the drinking straw (1) is made into a drink container. Although it is preferable to pierce and suck, in the processing method of the present invention, since it is molded by the molding part (21b) of the molding die (2), it is formed in this just good position.
Further, the height of the diameter-expanded portion (1a) is adjusted by an amount by which the beverage straw (1) is further pushed in after the beverage straw (1) comes into contact with the step portion (22b). For example, in the case of a drinking straw (1) having an outer diameter of 5 mm, it is about 1 mm to 3 mm.
When the molding die (2) is pushed into the drinking straw (1), the molding die (2) is continuously pushed in until the enlarged diameter portion (1a) is molded. And after a diameter-expanded part (1a) is shape | molded, what is necessary is just to extract a shaping die (2) from the drinking straw (1).
上記の説明した加工方法は、成形金型（２）の方を飲料用ストロー（１）側に移動した場合であるが、逆に飲料用ストロー（１）を成形金型（２）の方に移動して加工してもよく、その場合も成形金型（２）を移動するのと同様に加工される。 The processing method described above is a case where the molding die (2) is moved to the drinking straw (1) side, but conversely the drinking straw (1) is moved toward the molding die (2). It may be moved and processed, and in that case, it is processed in the same manner as moving the molding die (2).
本発明に使用する成形金型（２）に対し、その加熱装置、押し込むための移動装置等は、すべて公知のものが使用され、例えば、図示しないが、加熱装置としては成形金型（２）の外周に設けたドーナツ型のヒーターであり、他方、移動装置としては、アクチュエーター、駆動カム等を備えたものである。要するに、成形金型（２）が加熱状態で移動し飲料用ストロー（１）に押し込めるための加熱装置及び移動装置であればよい。
尚、成形金型（２）を移動させずに、飲料用ストロー（１）を成形金型（２）の方に移動する場合は、加熱装置は同様であるが、移動装置は飲料用ストロー（１）を移動するための移動装置が使用される。
For the molding die (2) used in the present invention, the heating device, the moving device for pushing in, etc. are all known ones. For example, although not shown, the heating device is a molding die (2). On the other hand, the moving device is provided with an actuator, a drive cam, and the like. In short, what is necessary is just a heating apparatus and a moving apparatus for a shaping | molding die (2) to move in a heating state, and to push it into the drinking straw (1).
When the drinking straw (1) is moved toward the molding die (2) without moving the molding die (2), the heating device is the same, but the moving device is the drinking straw ( A moving device for moving 1) is used.
また、飲料用ストロー（１）を成形金型（２）に搬送する手段としては、図示しないが、例えば、上部のホッパーと、その下部で、外周に多数の円弧状溝を設けたステップ回転する回転搬送ドラムと、その回転搬送ドラムの下半分に添って回転する押えベルトから成る供給搬送装置でもって、円弧状溝に収納した飲料用ストロー（１）を成形金型（２）と対向する所までステップ回転しながら送られる。
この際に、対向する飲料用ストロー（１）と成形金型（２）とは、互いの中心が一致した状態にセットされ、飲料用ストロー（１）あるいは成形金型（２）の何れかを移動させて加工される。
In addition, as a means for transporting the drinking straw (1) to the molding die (2), although not shown, for example, the upper hopper and the lower part thereof are rotated stepwise by providing a large number of arc-shaped grooves on the outer periphery. A place where a drinking straw (1) stored in an arc-shaped groove is opposed to a molding die (2) in a supply / conveying device comprising a rotary conveying drum and a presser belt rotating along the lower half of the rotary conveying drum. Sent while rotating step by step.
At this time, the drinking straw (1) and the molding die (2) facing each other are set so that their centers coincide with each other, and either the drinking straw (1) or the molding die (2) is used. It is moved and processed.
１ 飲料用ストロー
1a 拡径部
1b 縮径部
２ 成形金型
21 金型本体
21a 挿入穴
21b 成形部
21c 内周面
22 段付きピン中子
22a 細軸部
22b 段部
23 間隙部
1 Drinking straw
1a Expanded part
1b Reduced diameter part 2 Mold
21 Mold body
21a Insertion hole
21b Molding part
21c Inner peripheral surface
22 Stepped pin core
22a Fine shaft
22b Step
23 Gap
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| JP2012236476A JP5782007B2 (en) | 2012-10-26 | 2012-10-26 | Processing method for reduced diameter part and ring-shaped enlarged part of drinking straw |
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| JP2012236476A JP5782007B2 (en) | 2012-10-26 | 2012-10-26 | Processing method for reduced diameter part and ring-shaped enlarged part of drinking straw |
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| JP2014083820A JP2014083820A (en) | 2014-05-12 |
| JP5782007B2 true JP5782007B2 (en) | 2015-09-24 |
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| CN110435228B (en) * | 2019-08-14 | 2022-01-07 | 义乌市给力机械设备有限公司 | Flaring and closing device for paper telescopic straw automatic sleeve production line |
| JP7404804B2 (en) | 2019-11-21 | 2023-12-26 | 株式会社島津製作所 | Resin tube end forming method and forming tool |
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| JPS5945491B2 (en) * | 1976-05-28 | 1984-11-07 | 積水化学工業株式会社 | Method for manufacturing thermoplastic resin pipe with socket and groove for attaching packing etc. |
| US4736887A (en) * | 1985-03-08 | 1988-04-12 | Koichi Inaba | Extensible straw assembly for beverages |
| DE4423372A1 (en) * | 1994-07-04 | 1996-01-11 | Ruppert Hans Peter | Method and device for forming flanges on pipes made of partially crystalline thermoplastics |
| JP3569573B2 (en) * | 1995-07-31 | 2004-09-22 | 東洋キャップ製造株式会社 | Straw end forming equipment |
| EP0931489A1 (en) * | 1998-01-27 | 1999-07-28 | Carapak Braintrust Nv | A tubular element for removal of liquid and a process for manufacturing such a tubular element |
| JP4529697B2 (en) * | 2005-01-14 | 2010-08-25 | 豊田合成株式会社 | Tubular body manufacturing method and diameter-reducing jig used in the manufacturing method |
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