JP2005313427A - Injection molding method for conveyance container - Google Patents

Injection molding method for conveyance container Download PDF

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JP2005313427A
JP2005313427A JP2004132781A JP2004132781A JP2005313427A JP 2005313427 A JP2005313427 A JP 2005313427A JP 2004132781 A JP2004132781 A JP 2004132781A JP 2004132781 A JP2004132781 A JP 2004132781A JP 2005313427 A JP2005313427 A JP 2005313427A
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container
hole
injection molding
handle
rib
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Kazuhisa Aono
一久 青野
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Mitsubishi Plastics Inc
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Mitsubishi Plastics Inc
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Priority to JP2004132781A priority Critical patent/JP2005313427A/en
Publication of JP2005313427A publication Critical patent/JP2005313427A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/2628—Moulds with mould parts forming holes in or through the moulded article, e.g. for bearing cages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/34—Moulds having venting means

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding method for a conveyance vehicle which can enough improve the strength of a grip part without increasing the wall thickness of the grip part or fitting a large rib for reinforcement. <P>SOLUTION: In the injection molding method for the conveyance container 11 having a through hole 14 for a handle in the vicinity of the opening of the container 11 with its upper part opened by using a mold having a resin gate on the container bottom side of the through hole, at least one lateral rib 19 having a semi-circular cross section is formed on the outside surface of a grip part 15 on the container opening side of the through hole, and gas is extracted from a degassing slit formed in the bottom part of a concave channel forming the apex part of the lateral rib. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、運搬用容器の射出成形方法に関し、詳しくは、容器開口部の近傍に把手用通孔を設けてグリップ部を形成した合成樹脂製の運搬用収納容器を射出成形法により製造する方法に関する。   The present invention relates to an injection molding method for a transport container. More specifically, the present invention relates to a method for manufacturing a transport container made of synthetic resin having a grip through hole provided near a container opening by an injection molding method. About.

合成樹脂製の運搬用容器は、飲料用瓶の搬送や保管等に広く用いられている。このような運搬用容器には、人手による搬送を容易に行えるように、容器開口部の外周に把手部が設けられているが、この把手部の下部に通孔を設けて把手部を手で握れるようにしたもの、すなわち、グリップ部を形成するようにしたものが多い。   Synthetic resin transport containers are widely used for transporting and storing beverage bottles. In such a transport container, a handle portion is provided on the outer periphery of the opening portion of the container so that it can be easily transported by hand. A through hole is provided at a lower portion of the handle portion so that the handle portion can be manually moved. There are many things that can be gripped, that is, those that form a grip portion.

このような合成樹脂製の運搬用容器は、一般に射出成形法で一体成形することにより製造されるが、通常は、樹脂ゲート部が容器底面部に設けられているため、容器開口部の近傍に把手用通孔を設けたものは、グリップ部の中央付近で樹脂が合流する状態になる。この射出成形における樹脂の合流部（ウェルド部）は、そのときの成形条件の影響を受け易く、ウェルド強度も変化するため、厳重な品質管理体制が必要であった。   Such synthetic resin transport containers are generally manufactured by integral molding by an injection molding method. Normally, however, the resin gate is provided on the bottom of the container, so that it is in the vicinity of the container opening. The thing provided with the through-hole for a handle will be in the state where resin merges near the center of a grip part. The joint part (weld part) of the resin in this injection molding is easily affected by the molding conditions at that time, and the weld strength also changes, so a strict quality control system is necessary.

また、上記グリップ部を成形する金型部分には、型内の空気や樹脂の揮発分、樹脂の分解成分を型外に排出するためのガス抜き部を設けて強度を得るようにしているが、ウェルド部の強度は他の部分と比べて劣っていた。すなわち、上記グリップ部では、成形時に左右対称の樹脂の流れが合流する状態になるため、ウェルド部が一直線状に形成されることになり、左右対称性から、その断面は、一平面状に近い状態になると考えられる。したがって、このウェルド部の強度は、母材の強度に比べればかなり低い値となり、グリップ部における所定の強度を得るためには、グリップ部の肉厚を増加させたり、補強用のリブを設けたりする必要があった。   In addition, the mold part for forming the grip part is provided with a gas vent part for discharging the air in the mold, the volatile content of the resin, and the decomposition components of the resin out of the mold to obtain strength. The strength of the weld part was inferior to the other parts. That is, in the grip part, since the flow of the symmetrical resin flows at the time of molding, the weld part is formed in a straight line, and the cross section is almost uniplanar due to the left-right symmetry. It is considered to be in a state. Therefore, the strength of the weld portion is considerably lower than the strength of the base material, and in order to obtain a predetermined strength in the grip portion, the thickness of the grip portion is increased or a reinforcing rib is provided. There was a need to do.

このため、把手用通孔より容器開口部側の範囲内に樹脂ゲート部を設けた金型を使用して運搬用容器を射出成形することにより、グリップ部にウェルド部が形成されないようにする方法が提案されている（例えば、特許文献１参照。）。
特開平１０−７６５４９号公報 For this reason, a method for preventing the weld from being formed in the grip portion by injection-molding the transporting container using a mold provided with a resin gate portion within the range of the container opening side from the handle through-hole. Has been proposed (see, for example, Patent Document 1).
JP-A-10-76549

上述の方法によれば、グリップ部にウェルド部が形成されることがないので、厚肉にしたり、リブを設けたりすることなくグリップ部の強度向上が図れ、収納容器の軽量化やコストダウンが図れるという利点はあるものの、金型の構造が複雑になるという問題があった。   According to the above method, since the weld portion is not formed in the grip portion, the strength of the grip portion can be improved without increasing the thickness or providing the rib, and the weight and cost of the storage container can be reduced. Although there is an advantage that it can be achieved, there is a problem that the structure of the mold becomes complicated.

そこで本発明は、グリップ部の肉厚を増加させたり、補強用の大きなリブを設けたりすることなく、小さな横リブを追加するとともに、このリブの部分から十分なガス抜きが行えるようにすることにより、グリップ部の強度を十分に向上させることが可能な運搬用容器の射出成形方法を提供することを目的としている。   Therefore, the present invention is to add a small lateral rib without increasing the thickness of the grip portion or providing a large rib for reinforcement, and to allow sufficient degassing from the rib portion. Thus, an object of the present invention is to provide an injection molding method for a transport container capable of sufficiently improving the strength of the grip portion.

上記目的を達成するため、本発明の運搬用容器の射出成形方法は、上方が開口した運搬用容器の容器開口部近傍に把手用通孔を有する運搬用容器を、前記把手用通孔よりも容器底部側に樹脂ゲートを有する金型を用いて射出成形する方法において、前記把手用通孔の容器開口部側のグリップ部外側面に断面半円形状の横リブを１本以上形成するとともに、該横リブの頂点部分からガス抜きを行うことを特徴としている。   In order to achieve the above-mentioned object, the injection molding method for a transport container according to the present invention includes a transport container having a handle through hole in the vicinity of the container opening of the transport container having an upper opening than the handle through hole. In the method of injection molding using a mold having a resin gate on the container bottom side, one or more horizontal ribs having a semicircular cross section are formed on the grip portion outer surface of the handle opening side of the handle through-hole, It is characterized in that gas is vented from the apex portion of the lateral rib.

本発明の運搬用容器の射出成形方法によれば、ウェルド部による破損が容器高さ方向であるから、グリップ部に横リブを追加することによってグリップ部の強度を向上させることができる。また、横リブの断面形状を半円形状としているので、グリップ部の側壁や従来から設けられているリブを肉厚にするのに比べて大幅に樹脂量を少なくでき、変形や寸法誤差、重量増も抑えることができる。さらに、ガスは樹脂の流動末端部に集まるため、側壁部よりも肉厚が厚い横リブに集まりやすくなるので、横リブの頂点からガスを抜くことによってガスを効率よく抜くことができる。   According to the injection molding method for a transporting container of the present invention, the damage due to the weld part is in the container height direction. Therefore, the strength of the grip part can be improved by adding a lateral rib to the grip part. In addition, since the cross-sectional shape of the lateral ribs is semicircular, the amount of resin can be greatly reduced compared to making the side wall of the grip part and the conventional ribs thicker, resulting in deformation, dimensional errors, and weight. The increase can also be suppressed. Furthermore, since the gas collects at the flow end portion of the resin, it is easy to collect in the lateral ribs that are thicker than the side wall portions, so that the gas can be efficiently extracted by extracting the gas from the apex of the lateral ribs.

図は本発明方法を適用した運搬用容器の一形態例を示すもので、図１は運搬用容器の斜視図、図２は同じく正面図、図３は図２のIII−III断面図、図４は射出成形金型の要部を示す断面図である。   FIG. 1 shows an example of a transport container to which the method of the present invention is applied. FIG. 1 is a perspective view of the transport container, FIG. 2 is a front view of the same, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view showing the main part of the injection mold.

運搬用容器１１は、方形状の底板１２と、四周の側壁１３，１３とからなる箱状のものであって、容器開口部近傍には把手用通孔１４が設けられ、この把手用通孔１４によって容器開口部側にグリップ部１５が形成されている。各側壁１３の外面には、縦方向及び横方向の板状リブ１６，１７が多数設けられており、把手用通孔１４の周囲は環状リブ１８によって囲まれている。   The transporting container 11 is a box-shaped object composed of a rectangular bottom plate 12 and four side walls 13 and 13. A handle through hole 14 is provided in the vicinity of the container opening, and this handle through hole is provided. 14, a grip portion 15 is formed on the container opening side. A large number of longitudinal and lateral plate-like ribs 16 and 17 are provided on the outer surface of each side wall 13, and the periphery of the handle through-hole 14 is surrounded by an annular rib 18.

このような運搬用容器１１において、把手用通孔１４の容器開口部側に位置するグリップ部１５の外側面には、断面半円形状の横リブ１９が同じ形状で平行に５本、等間隔で設けられている。この横リブ１９の半径、すなわち、側壁からの突出量は、０．５〜３ｍｍの範囲に設定されており、前記板状リブ１６，１７の突出量が１５〜２０ｍｍ程度であるのに比べて小さく、横リブ１９の直径が板状リブ１６，１７の厚みと同じであっても、断面積は大幅に小さくなっている。   In such a transporting container 11, five lateral ribs 19 having a semicircular cross-section in the same shape and parallel to the outer surface of the grip part 15 located on the container opening part side of the handle through hole 14 are equally spaced. Is provided. The radius of the lateral rib 19, that is, the protruding amount from the side wall is set in a range of 0.5 to 3 mm, compared with the protruding amount of the plate-like ribs 16 and 17 being about 15 to 20 mm. Even if the diameter of the lateral rib 19 is the same as the thickness of the plate-like ribs 16 and 17, the cross-sectional area is significantly reduced.

前記運搬用容器１１は、図４に示すように、固定型２１、可動型２２、スライド型２３等を有する射出成形金型によって射出成形される。型内には、底板成形部３１，側板成形部３２，グリップ部成形部３３，通孔成形部３４，板状リブ成形部３５等がそれぞれ設けられており、グリップ部成形部３３の外側面成形部には、前記横リブ１９を成形するための半円形状の凹溝３６が設けられるとともに、各凹溝３６の底部にはガス抜きスリット３７がそれぞれ設けられている。   As shown in FIG. 4, the transport container 11 is injection-molded by an injection mold having a fixed mold 21, a movable mold 22, a slide mold 23 and the like. In the mold, a bottom plate forming portion 31, a side plate forming portion 32, a grip portion forming portion 33, a through hole forming portion 34, a plate-like rib forming portion 35, etc. are provided. The part is provided with a semicircular concave groove 36 for forming the lateral rib 19, and a gas vent slit 37 is provided at the bottom of each concave groove 36.

前記各型の組み合わせによって形成されたキャビティ内には、把手用通孔１４よりも容器底部側に設けられた樹脂ゲート、例えば、底板成形部３１に設けられた樹脂ゲート３８から溶融樹脂が射出されて運搬用容器１１が成形される。このとき、グリップ部成形部３３に流れる溶融樹脂は、通孔成形部３４を迂回して流れ、グリップ部形成部３３の両側から流れ込んで中央付近で合流し、グリップ部１５の中央付近に容器高さ方向のウェルド部が発生することになる。   In the cavity formed by the combination of the molds, molten resin is injected from a resin gate provided on the container bottom side with respect to the handle through-hole 14, for example, a resin gate 38 provided on the bottom plate molding portion 31. Thus, the transport container 11 is formed. At this time, the molten resin flowing in the grip part forming part 33 flows around the through hole forming part 34, flows from both sides of the grip part forming part 33, and merges in the vicinity of the center. A weld portion in the vertical direction is generated.

このようにして運搬用容器１１を射出成形する際に、樹脂の合流部（ウェルド部）となるグリップ部成形部３３に複数の断面半円形状の横リブ１９を成形するための凹溝３６を設けるとともに、横リブ１９の頂点部分となる凹溝３６の底部にガス抜きスリット３７を設けておくことにより、溶融樹脂の流動末端部に集まる型内のガスを、凹溝３６によって他の側板成形部３２や板状リブ成形部３５よりも厚肉になっているグリップ部成形部３３に集めやすくなり、集まったガスをガス抜きスリット３７から型外へ効率よく排出することができる。   Thus, when the transport container 11 is injection-molded, the concave groove 36 for molding the plurality of semicircular cross-sectional lateral ribs 19 is formed in the grip part molding part 33 which becomes a resin joining part (weld part). In addition, by providing a gas vent slit 37 at the bottom of the concave groove 36 which is the apex portion of the lateral rib 19, the gas in the mold gathered at the flow end portion of the molten resin is formed into another side plate by the concave groove 36. It becomes easy to collect in the grip part molding part 33 which is thicker than the part 32 and the plate-like rib molding part 35, and the collected gas can be efficiently discharged out of the mold from the gas vent slit 37.

そして、成形後の運搬用容器１１においては、グリップ部１５に発生するウェルド部に直交する方向の横リブ１９を形成した状態に設けられていることから、ウェルド部の破損方向に対する強度を大幅に向上させることができる。また、前述のように、通常の板状リブ１６，１７に比べて断面積が小さくなっているので、大幅に樹脂量を少なくすることができる。さらに、横リブ１９の突出量に合わせてグリップ部１５の全体を厚肉にする場合に比べても樹脂量を少なくすることができる。これにより、製品の変形や寸法誤差、重量増も抑えることができる。   And since the conveyance container 11 after shaping | molding is provided in the state which formed the horizontal rib 19 of the direction orthogonal to the weld part which generate | occur | produces in the grip part 15, the intensity | strength with respect to the failure direction of a weld part is greatly increased. Can be improved. In addition, as described above, since the cross-sectional area is smaller than that of the normal plate-like ribs 16 and 17, the amount of resin can be greatly reduced. Furthermore, the amount of resin can be reduced as compared with the case where the entire grip portion 15 is thickened in accordance with the protruding amount of the lateral rib 19. Thereby, deformation of the product, dimensional error, and weight increase can be suppressed.

なお、横リブ１９の設置数や半径は任意であり、運搬用容器１１及びグリップ部１５の形状や必要強度、他に設けられている板状リブ１６，１７の形状や配置状態に応じて適当に設定することができ、１本でも十分な効果を得られることがある。   The number and the radius of the lateral ribs 19 are arbitrary, and are appropriate according to the shape and required strength of the transport container 11 and the grip portion 15 and the shape and arrangement of the plate-like ribs 16 and 17 provided elsewhere. In some cases, even a single effect can provide a sufficient effect.

本発明方法を適用した運搬用容器の一形態例を示す斜視図である。It is a perspective view which shows one example of a container for conveyance to which the method of this invention is applied. 同じく正面図である。It is also a front view. 図２のIII−III断面図である。FIG. 3 is a sectional view taken along line III-III in FIG. 2. 射出成形金型の要部を示す断面図である。It is sectional drawing which shows the principal part of an injection mold.

符号の説明Explanation of symbols

１１…運搬用容器、１２…底板、１３…側壁、１４…把手用通孔、１５…グリップ部、１６，１７…板状リブ、１８…環状リブ、１９…横リブ、２１…固定型、２２…可動型、２３…スライド型、３１…底板成形部、３２…側板成形部、３３…グリップ部成形部、３４…通孔成形部、３５…板状リブ成形部、３６…凹溝、３７…ガス抜きスリット、３８…樹脂ゲート   DESCRIPTION OF SYMBOLS 11 ... Container for conveyance, 12 ... Bottom plate, 13 ... Side wall, 14 ... Passage hole for grip, 15 ... Grip part, 16, 17 ... Plate-shaped rib, 18 ... Circular rib, 19 ... Lateral rib, 21 ... Fixed type, 22 ... movable mold, 23 ... slide mold, 31 ... bottom plate forming part, 32 ... side plate forming part, 33 ... grip part forming part, 34 ... through hole forming part, 35 ... plate-like rib forming part, 36 ... concave groove, 37 ... Gas vent slit, 38 ... resin gate

Claims (1)

上方が開口した運搬用容器の容器開口部近傍に把手用通孔を有する運搬用容器を、前記把手用通孔よりも容器底部側に樹脂ゲートを有する金型を用いて射出成形する方法において、前記把手用通孔の容器開口部側のグリップ部外側面に断面半円形状の横リブを１本以上形成するとともに、該横リブの頂点部分からガス抜きを行うことを特徴とする運搬用容器の射出成形方法。   In the method of injection molding using a mold having a resin gate on the container bottom side of the handle through hole, a transport container having a handle through hole in the vicinity of the container opening of the transport container having an upper opening, One or more horizontal ribs having a semicircular cross section are formed on the grip portion outer side surface of the handle through hole on the container opening side, and gas is vented from the apex portion of the horizontal rib. Injection molding method.
JP2004132781A 2004-04-28 2004-04-28 Injection molding method for conveyance container Pending JP2005313427A (en)

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JP2011020265A (en) * 2009-07-13 2011-02-03 Sanko Co Ltd Integrally molded type container molding method
WO2011087140A1 (en) * 2010-01-13 2011-07-21 Canon Kabushiki Kaisha Resin-molded component and resin-molding mold
JP2016101675A (en) * 2014-11-27 2016-06-02 日本プラスト株式会社 Resin molded article
WO2018062393A1 (en) * 2016-09-28 2018-04-05 キョーラク株式会社 Molded article and manufacturing method for same
JP2018179357A (en) * 2017-04-07 2018-11-15 キョーラク株式会社 Formed part and method of manufacturing the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011020265A (en) * 2009-07-13 2011-02-03 Sanko Co Ltd Integrally molded type container molding method
WO2011087140A1 (en) * 2010-01-13 2011-07-21 Canon Kabushiki Kaisha Resin-molded component and resin-molding mold
CN102712119A (en) * 2010-01-13 2012-10-03 佳能株式会社 Resin-molded component and resin-molding mold
CN102712119B (en) * 2010-01-13 2015-05-20 佳能株式会社 Resin-molded component and resin-molding mold
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