JP6792565B2 - Injection molding mold for resin molded product and resin molded product - Google Patents

Injection molding mold for resin molded product and resin molded product Download PDF

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JP6792565B2
JP6792565B2 JP2017555018A JP2017555018A JP6792565B2 JP 6792565 B2 JP6792565 B2 JP 6792565B2 JP 2017555018 A JP2017555018 A JP 2017555018A JP 2017555018 A JP2017555018 A JP 2017555018A JP 6792565 B2 JP6792565 B2 JP 6792565B2
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resin molded
injection molding
base end
molded product
rib
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JPWO2017098942A1 (en
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直高 堀
直高 堀
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TRUMO KABUSHIKI KAISHA
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • 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
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
    • 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
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/44—Removing or ejecting moulded articles for undercut articles

Description

本発明は、樹脂成形体の射出成形用金型およびその金型を用いて作製された樹脂成形体に関するものである。 The present invention relates to an injection molding die for a resin molded body and a resin molded body manufactured by using the mold.

一般に、樹脂成形体、例えばシリンジ用外筒を形成する場合、シリンジ用外筒の外面形状を形成するための外側金型（キャビティ）と、シリンジ用外筒の内面形状及び基端形状を成形するためのコアからなる射出成形用金型を用いて、これらの金型の間に溶融樹脂を注入する射出成形方法により行われている。 Generally, when forming a resin molded body, for example, an outer cylinder for a syringe, an outer mold (cavity) for forming an outer surface shape of the outer cylinder for a syringe and an inner surface shape and a base end shape of the outer cylinder for a syringe are formed. This is performed by an injection molding method in which a molten resin is injected between these dies using an injection molding die composed of a core for the purpose.

このような射出成形に使用される金型としては、本件出願人が提案する特許文献１（特開２００７−９８６９８）、特許文献２（特開２００６−２７１６６５）がある。 Examples of the mold used for such injection molding include Patent Document 1 (Japanese Patent Laid-Open No. 2007-98698) and Patent Document 2 (Japanese Patent Laid-Open No. 2006-271665) proposed by the applicant.

特許文献１および２のものでは、射出成形用金型１は、図１，図２に示すように、キャビティ２と、コア３，１４とを備えている。キャビティ２内にコア３を挿入することによりキャビティ２と、コア３，１４との間には、シリンジ用外筒成形物が形成される空隙１０が形成される。コア３は、図１ないし図４に示すように、外筒本体部形成部６と、ノズル部形成部１１とを備えている。ノズル部形成部１１は、本体部形成部６の先端側に形成されノズル部３８の内面形状を形成する部分である。 In those of Patent Documents 1 and 2, the injection molding die 1 includes a cavity 2 and cores 3 and 14 as shown in FIGS. 1 and 2. By inserting the core 3 into the cavity 2, a gap 10 is formed between the cavity 2 and the cores 3 and 14 to form an outer cylinder molded product for a syringe. As shown in FIGS. 1 to 4, the core 3 includes an outer cylinder body portion forming portion 6 and a nozzle portion forming portion 11. The nozzle portion forming portion 11 is a portion formed on the tip end side of the main body portion forming portion 6 to form the inner surface shape of the nozzle portion 38.

本体部形成部６は、シリンジ用外筒２０の外筒本体部３７の内面形状を形成する部分である。本体部形成部６は、図１，図２に示すように、縮径部６ａと、略同一外径部６ｂとを備えている。そして、略同一外径部６ｂの基端部にはリブ１３が設けられている。 本体部形成部６に設けられたリブ１３は、本体部形成部６の円周上に形成された環状リブ１３であることが好ましい。環状リブ１３は、本発明の実施例においては、断面形状が略台形状となっている。また、環状リブ１３は、断面形状が略円形状もしくは略楕円形状であってもよい。また、コア３，１４の環状リブ１３より基端側部分は基端側に向かって拡径している。コア３に環状リブ１３が形成されていることにより、シリンジ用外筒２０には、環状溝部５９が形成される。 The main body portion forming portion 6 is a portion that forms the inner surface shape of the outer cylinder main body portion 37 of the syringe outer cylinder 20. As shown in FIGS. 1 and 2, the main body portion forming portion 6 includes a reduced diameter portion 6a and a substantially the same outer diameter portion 6b. A rib 13 is provided at the base end portion of the substantially same outer diameter portion 6b. The rib 13 provided in the main body portion forming portion 6 is preferably an annular rib 13 formed on the circumference of the main body portion forming portion 6. In the embodiment of the present invention, the annular rib 13 has a substantially trapezoidal cross-sectional shape. Further, the annular rib 13 may have a substantially circular shape or a substantially elliptical cross-sectional shape. Further, the diameter of the base end side portion of the cores 3 and 14 from the annular rib 13 is increased toward the base end side. Since the annular rib 13 is formed in the core 3, the annular groove portion 59 is formed in the outer cylinder 20 for the syringe.

上記特許文献１および２のものでは、シリンジ用外筒２０が環状溝部５９を有している。これに対して、特許文献３（特開平７−３２３０８５）のようなものも提案されている。 In those of Patent Documents 1 and 2, the syringe outer cylinder 20 has an annular groove portion 59. On the other hand, a patent document 3 (Japanese Patent Laid-Open No. 7-323805) has also been proposed.

特許文献３のシリンジ外筒は、筒体部と該筒体部先端に突設されるチップ部からなる熱可塑性樹脂性シリンジ外筒であり、該筒体部内壁が先端から底部にかけて、底部の方が広がったテーパー状となっている。そして、図１に示すシリンジ外筒１は、筒体部であり、チップ部２，フランジ３を備える。また、ディスポーザブルシリンジの外筒においては、製造時において、金型から取り出しの際、雌金型に成形品が残らないようにするために、筒体部底部近傍の内壁にアンダーカットの凸部４等が設けられている。 The syringe outer cylinder of Patent Document 3 is a thermoplastic resin syringe outer cylinder including a cylinder portion and a tip portion projecting from the tip of the cylinder portion, and the inner wall of the cylinder portion extends from the tip to the bottom of the bottom portion. It has a tapered shape with a wider side. The syringe outer cylinder 1 shown in FIG. 1 is a tubular body portion and includes a tip portion 2 and a flange 3. Further, in the outer cylinder of the disposable syringe, the undercut convex portion 4 is formed on the inner wall near the bottom of the cylinder portion so that the molded product does not remain in the female mold when it is taken out from the mold during manufacturing. Etc. are provided.

特開２００７−９８６９８JP-A-2007-98698 特開２００６−２７１６６５JP 2006-271665 特開平７−３２３０８５JP-A-7-323805

上述した特許文献３のような筒体部底部近傍の内壁に環状リブを有するシリンジ外筒においても、金型として、外側金型とその中に挿入されるコアとにより構成されるものが一般的である。そして、シリンジ外筒は、上記の金型に熱可塑性樹脂を射出成形し、金型内より取り出すことにより、作製される。外筒の金型からの取り出しは、通常、射出樹脂の冷却後、外側金型より、コアを引き抜き、続いて、外筒より、コアを引き抜くことにより行われる。 Even in a syringe outer cylinder having an annular rib on the inner wall near the bottom of the cylinder portion as described in Patent Document 3, the mold is generally composed of an outer mold and a core inserted therein. Is. Then, the syringe outer cylinder is manufactured by injection molding a thermoplastic resin into the above-mentioned mold and taking it out from the inside of the mold. The outer cylinder is usually taken out from the mold by cooling the injection resin, pulling out the core from the outer mold, and then pulling out the core from the outer cylinder.

上記の工程において、外側金型より、コアを引き抜いた時、外側金型に成形物である外筒が残留することがあった。さらに、外筒よりコアを引き抜く際に、筒体部底部近傍に内面リブを形成するための外面凹部の先端側部分が、内面リブを乗り越える際に、環状リブに損傷を与えることがあった。 In the above step, when the core was pulled out from the outer mold, the outer cylinder, which was a molded product, sometimes remained in the outer mold. Further, when the core is pulled out from the outer cylinder, the tip end side portion of the outer surface recess for forming the inner surface rib near the bottom of the cylinder portion may damage the annular rib when overcoming the inner surface rib.

本発明の目的は、外側金型とコアとからなるシリンジ外筒のような樹脂成形体形成用金型において、成形体形成用樹脂の射出後、外側金型よりコアを引き抜いた時、外側金型に成形物である外筒が残留することがなく、外筒を金型より容易に取り出すことができ、かつ、外筒よりコアを引き抜く際に、成形物の基端部内面に形成された内面リブに損傷を与えることが極めて少ない樹脂成形体の射出成形用金型およびその金型を用いて作製された樹脂成形体を提供するものである。 An object of the present invention is an outer mold when a core is pulled out from an outer mold after injection of a molding resin in a resin molded body forming mold such as a syringe outer cylinder composed of an outer mold and a core. The outer cylinder, which is a molded product, does not remain in the mold, the outer cylinder can be easily taken out from the mold, and the core is formed on the inner surface of the base end of the molded product when the core is pulled out from the outer cylinder. It is an object of the present invention to provide an injection molding die of a resin molded body that hardly damages the inner rib, and a resin molded body manufactured by using the die.

上記目的を達成するものは、以下のものである。
先端部と、基端部と、前記基端部の内面に設けられた内面リブと、前記内面リブより前記基端部の基端側に位置する内面凹部とを備える筒状の樹脂成形体のための射出成形用金型であって、前記射出成形用金型は、前記樹脂成形体の外側形状を形成するための外側金型と、前記外側金型内に挿入され、前記樹脂成形体の内側形状を形成するためのコアとを備え、前記外側金型は、前記樹脂成形体の外側形状を形成するための内面部と、前記外側金型と前記コア間の空隙に溶融樹脂を注入するための溶融樹脂注入ゲートとを備え、前記コアは、前記樹脂成形体の内側形状を形成するための外面部を備え、前記外面部は、前記内面リブを形成するための外面凹部と、前記外面凹部より前記コアの先端側に設けられ、前記樹脂成形体の本体部の内面を形成する本体部形成部と、前記樹脂成形体の前記先端部の内面を形成する先端部形成部と、前記外面凹部より前記コアの基端側に形成され、前記内面凹部を形成するための外面リブとを備え、前記本体部形成部の外面の基端方向延長線と前記外面リブの基端側部分間の傾斜角度βは、前記本体部形成部の外面の基端方向延長線と前記外面凹部の先端側部分間の傾斜角度αより大きく、前記外面リブの高さＨは、前記外面凹部の深さＤより大きいものとなっている筒状の樹脂成形体の射出成形用金型。 Those that achieve the above objectives are as follows.
And a distal end, a proximal end, wherein the inner surface ribs provided on the inner surface of the base end portion, said inner surface ribs than the proximal end cylindrical having an inner surface recess located on the proximal side of the resin molding The injection molding mold for forming the outer mold for forming the outer shape of the resin molded body and the outer mold inserted into the outer mold of the resin molded body. A core for forming an inner shape is provided, and the outer mold injects molten resin into an inner surface portion for forming an outer shape of the resin molded body and a gap between the outer mold and the core. The core is provided with an outer surface portion for forming the inner shape of the resin molded body, and the outer surface portion is an outer surface recess for forming the inner surface rib and the outer surface portion. provided on the distal end side of the core from the concave portion, a body portion forming part that forms the inner surface of the main body of the resin molded body, and a distal portion forming portion that forms the inner surface of the tip portion of the resin molded body, said outer surface It is formed on the base end side of the core from the recess, and is provided with an outer surface rib for forming the inner surface recess, and is between the extension line of the outer surface of the main body forming portion and the base end side portion of the outer surface rib. The inclination angle β is larger than the inclination angle α between the extension line in the proximal direction of the outer surface of the main body forming portion and the tip end side portion of the outer surface recess, and the height H of the outer surface rib is the depth D of the outer surface recess. A mold for injection molding of a tubular resin molded body that is larger.

また、上記目的を達成するものは、以下のものである。
上記に記載の樹脂成形体の射出成形用金型を用いて射出成形された筒状の樹脂成形体であって、前記樹脂成形体は、前記樹脂成形体の基端部内面に設けられた内面リブと、前記内面リブと近接しかつ前記内面リブより前記樹脂成形体の基端側に位置する内面凹部と、前記内面凹部より前記樹脂成形体の基端側に位置し、前記樹脂成形体の基端に向かって拡径する基端テーパー部とを備える筒状の樹脂成形体。 In addition, those that achieve the above objectives are as follows.
A tubular resin molded body injection-molded using the injection molding mold of the resin molded body described above, wherein the resin molded body is an inner surface provided on an inner surface of a base end portion of the resin molded body. The ribs, the inner surface recesses that are close to the inner surface ribs and located closer to the base end side of the resin molded body than the inner surface ribs, and the inner surface recesses that are located closer to the base end side of the resin molded body than the inner surface recesses of the resin molded body. A tubular resin molded body having a base end tapered portion whose diameter increases toward the base end.

図１は、本発明の樹脂成形体の射出成形用金型をシリンジ用外筒の射出成形用金型に応用した実施例の部分破断図（外側金型を断面にて、コアを外観にて示す図）である。FIG. 1 is a partially broken view of an example in which an injection molding die of a resin molded product of the present invention is applied to an injection molding die of an outer cylinder for a syringe (outer mold in cross section, core in appearance). (Figure shown). 図２は、図１に示した射出成形用金型のＡ−Ａ線にて部分的に破断した図（外側金型を断面にて、コアを外観にて示す図）である。FIG. 2 is a view in which the injection molding die shown in FIG. 1 is partially broken along the line AA (a view showing the outer mold in cross section and the core in appearance). 図３は、図１に示した射出成形用金型の基端部付近の部分拡大図である。FIG. 3 is a partially enlarged view of the vicinity of the base end portion of the injection molding die shown in FIG. 図４は、図１に示した射出成形用金型の一方の基端部付近の部分拡大図である。FIG. 4 is a partially enlarged view of the vicinity of one base end portion of the injection molding die shown in FIG. 図５は、図１に示した射出成形用金型の一方の外面凹部および外面リブ付近を説明するための説明図である。FIG. 5 is an explanatory view for explaining the vicinity of one outer surface recess and the outer surface rib of the injection molding die shown in FIG. 図６は、他の実施例の射出成形用金型を説明するための射出成形用金型を部分的に破断した図（外側金型を断面にて、コアを外観にて示す図）である。FIG. 6 is a view in which the injection molding die for explaining the injection molding die of another embodiment is partially broken (the outer mold is shown in cross section and the core is shown in appearance). .. 図７は、他の実施例の射出成形用金型を説明するための射出成形用金型を部分的に破断した図（外側金型を断面にて、コアを外観にて示す図）である。FIG. 7 is a view in which the injection molding die for explaining the injection molding die of another embodiment is partially broken (the outer mold is shown in cross section and the core is shown in appearance). .. 図８は、本発明の樹脂成形体の実施例であるシリンジ用外筒の部分破断図である。FIG. 8 is a partially cutaway view of an outer cylinder for a syringe, which is an example of the resin molded product of the present invention. 図９は、本発明の樹脂成形体の射出成形用金型の作用を説明するための説明図である。FIG. 9 is an explanatory diagram for explaining the operation of the injection molding die of the resin molded product of the present invention. 図１０は、本発明の樹脂成形体の射出成形用金型の作用を説明するための説明図である。FIG. 10 is an explanatory diagram for explaining the operation of the injection molding die of the resin molded product of the present invention.

本発明の樹脂成形体の射出成形用金型をシリンジ用外筒の射出成形用金型に応用した実施例について、図面を用いて説明する。
なお、本発明の樹脂成形体の射出成形用金型は、シリンジ用外筒の射出成形用金型に限定されるものではなく、筒状の樹脂成形体、例えば、試験管、採血管、バイアル容器、薬剤容器などにも利用できる。An example in which the injection molding die of the resin molded body of the present invention is applied to the injection molding die of the outer cylinder for a syringe will be described with reference to the drawings.
The injection molding mold for the resin molded product of the present invention is not limited to the injection molding mold for the outer cylinder for the syringe, and the tubular resin molded product, for example, a test tube, a blood collection tube, or a vial. It can also be used for containers and drug containers.

本発明の樹脂成形体の射出成形用金型１は、先端部と、基端部と、基端部内面に設けられた内面リブ２７と、内面リブ２７より基端部の基端側に位置する内面凹部２８とを備える筒状の樹脂成形体２０のための射出成形用金型である。射出成形用金型１は、樹脂成形体２０の外側形状を形成するための外側金型２と、外側金型２内に挿入され、樹脂成形体の内側形状を形成するためのコア３とを備え、外側金型２は、樹脂成形体の外側形状を形成するための内面部と、外側金型２とコア３間の空隙に溶融樹脂を注入するための溶融樹脂注入ゲート１６とを備える。 The injection molding die 1 of the resin molded product of the present invention is located at the tip end portion, the base end portion, the inner surface rib 27 provided on the inner surface of the base end portion, and the base end side of the base end portion from the inner surface rib 27. This is an injection molding die for a tubular resin molded body 20 having an inner surface recess 28. The injection molding die 1 has an outer mold 2 for forming the outer shape of the resin molded body 20 and a core 3 inserted into the outer mold 2 for forming the inner shape of the resin molded body. The outer mold 2 includes an inner surface portion for forming the outer shape of the resin molded body, and a molten resin injection gate 16 for injecting the molten resin into the gap between the outer mold 2 and the core 3.

コア３は、樹脂成形体２０の内側形状を形成するための外面部６を備え、外面部６は、内面リブ２７を形成するための外面凹部７と、外面凹部７より先端側に設けられ、樹脂成形体の本体部の内面を形成する本体部形成部６ａと、樹脂成形体２０の先端部２３の内面を形成する先端部形成部６ｂと、外面凹部７より基端側に形成され、内面凹部２８を形成するための外面リブ８とを備える。 The core 3 includes an outer surface portion 6 for forming the inner shape of the resin molded body 20, and the outer surface portion 6 is provided with an outer surface recess 7 for forming the inner surface rib 27 and a tip side from the outer surface recess 7. A main body forming portion 6a forming the inner surface of the main body portion of the resin molded body, a tip forming portion 6b forming the inner surface of the tip portion 23 of the resin molded body 20, and an inner surface formed on the base end side of the outer surface recess 7 It is provided with an outer surface rib 8 for forming the recess 28.

そして、本体部形成部６ａの外面の基端方向延長線Sと外面リブ８の基端側部分８１間の傾斜角度βは、本体部形成部６ａの外面の基端方向延長線Sと外面凹部７の先端側部分７１間の傾斜角度αより大きく、外面リブ８の高さＨは、外面凹部７の深さＤより大きいものとなっている。 The inclination angle β between the extension line S of the outer surface of the main body forming portion 6a and the proximal end side portion 81 of the outer surface rib 8 is the extension line S of the outer surface of the main body forming portion 6a and the outer surface recess. The inclination angle α between the tip end side portions 71 of 7 is larger than the inclination angle α, and the height H of the outer surface rib 8 is larger than the depth D of the outer surface recess 7.

また、図示する実施例のシリンジ用外筒の射出成形用金型１は、先端に設けられた液体排出口２５と、基端部外面に設けられたフランジ部２４と、基端部内面に設けられた内面リブ２７と、内面リブ２７に近接しかつ基端側に設けられた内面凹部２８と、内面凹部の基端側の基端側に設けられ、かつ基端に向かって拡径する基端テーパー部２９とを備えるシリンジ用外筒（樹脂成形体）２０のための射出成形用金型である。 Further, the injection molding die 1 of the outer cylinder for a syringe of the illustrated embodiment is provided on the liquid discharge port 25 provided at the tip, the flange portion 24 provided on the outer surface of the base end portion, and the inner surface of the base end portion. An inner surface rib 27 provided, an inner surface recess 28 provided close to the inner surface rib 27 and provided on the proximal end side, and a group provided on the proximal end side of the inner surface concave portion on the proximal end side and increasing in diameter toward the proximal end. This is an injection molding die for a syringe outer cylinder (resin molded product) 20 having an end tapered portion 29.

射出成形用金型１は、外筒２０の外側形状を形成するための外側金型２と、外側金型２内に挿入され、外筒２０の内側形状を形成するためのコア３とを備える。外側金型２は、外筒２０の外側形状を形成するための内面部４と、外側金型２とコア３間の空隙１０に溶融樹脂を注入するための溶融樹脂注入ゲート１６を備える。 The injection molding die 1 includes an outer mold 2 for forming the outer shape of the outer cylinder 20 and a core 3 inserted into the outer mold 2 for forming the inner shape of the outer cylinder 20. .. The outer mold 2 includes an inner surface portion 4 for forming the outer shape of the outer cylinder 20, and a molten resin injection gate 16 for injecting the molten resin into the gap 10 between the outer mold 2 and the core 3.

コア３は、外筒２０の内側形状を形成するための外面部６を備える。外面部６は、内面リブ２７を形成するための外面凹部７と、外面凹部７より先端側に設けられ、外筒２０の本体部２１の内面を形成する本体部形成部６ａと、外筒２０の先端部２３の内面を形成する先端部形成部６ｂと、外面凹部７に近接しかつ基端側に設けられ、内面凹部２８を形成するための外面リブ８と、外面リブ８より基端側に形成され、外筒２０の基端テーパー部２９を形成するための基端側拡径テーパー部９と、外面凹部７と基端側拡径テーパー部９との境界部９ａとを備えている。 The core 3 includes an outer surface portion 6 for forming the inner shape of the outer cylinder 20. The outer surface portion 6 includes an outer surface recess 7 for forming the inner surface rib 27, a main body portion forming portion 6a provided on the tip side of the outer surface recess 7 and forming the inner surface of the main body portion 21 of the outer cylinder 20, and the outer cylinder 20. The tip forming portion 6b forming the inner surface of the tip portion 23 of the above, the outer surface rib 8 provided near the outer surface recess 7 and on the proximal end side for forming the inner surface recess 28, and the proximal end side of the outer surface rib 8. The base end side enlarged taper portion 9 for forming the base end side tapered portion 29 of the outer cylinder 20 and the boundary portion 9a between the outer surface recess 7 and the base end side enlarged diameter tapered portion 9 are provided. ..

この実施例のシリンジ用外筒の射出成形用金型１により射出形成されるシリンジ用外筒２０は、図８に示すような外面および内側形状を有している。具体的には、この実施例のシリンジ用外筒２０は、先端に設けられた液体排出口２５と、基端部外面に設けられたフランジ部２４と、基端部内面に設けられた内面リブ２７（環状内面リブ２７）と、内面リブ２７（環状内面リブ２７）の基端と近接するように設けられた内面凹部２８と、基端テーパー部２９と、凹部２８（この実施例では、環状凹部２８）と基端テーパー部２９の境界部に設けられた凸部環状凸部）を備えている。 The syringe outer cylinder 20 injected and formed by the injection molding die 1 of the syringe outer cylinder of this embodiment has an outer surface and an inner shape as shown in FIG. Specifically, the outer cylinder 20 for a syringe of this embodiment has a liquid discharge port 25 provided at the tip, a flange portion 24 provided on the outer surface of the base end portion, and an inner surface rib provided on the inner surface of the base end portion. 27 (annular inner surface rib 27), inner surface recess 28 provided so as to be close to the base end of the inner surface rib 27 (annular inner surface rib 27), base end tapered portion 29, and recess 28 (in this embodiment, annular shape). It is provided with a convex annular convex portion) provided at the boundary between the concave portion 28) and the proximal end tapered portion 29.

具体的には、図８に示すように、この実施例の外筒２０は、外筒本体部２１と、外筒本体部２１の先端部に設けられたノズル部２３と、外筒本体部２１の基端部に設けられたフランジ部２４と、内腔部２２とを備える。ノズル部２３は、その先端に液体排出口２５を備えている。
外筒本体部２１は、図８に示すように、ほぼ円筒状に延びるものとなっている。さらに、外筒２０の内面は、後述する内面リブ２７より先端側は、先端側に向かって、後述する基端テーパー部２９に比べてなだらかであり、かつ、僅かに縮径するテーパー部となっている。なお、このような、抜き勾配を持たないものであってもよい。Specifically, as shown in FIG. 8, the outer cylinder 20 of this embodiment includes an outer cylinder main body 21, a nozzle portion 23 provided at the tip of the outer cylinder main body 21, and an outer cylinder main body 21. A flange portion 24 provided at a base end portion thereof and a lumen portion 22 are provided. The nozzle portion 23 is provided with a liquid discharge port 25 at its tip.
As shown in FIG. 8, the outer cylinder main body 21 extends in a substantially cylindrical shape. Further, the inner surface of the outer cylinder 20 is a tapered portion whose tip side from the inner surface rib 27, which will be described later, is gentler toward the tip side than the base end tapered portion 29, which will be described later, and whose diameter is slightly reduced. ing. It should be noted that such a thing having no draft may be used.

ノズル部２３は、図８に示すように、先端に開口部（液体排出口）２５を有し、外筒本体部２１より小径の筒状部となっている。また、ノズル部２３は、先端側に向かって縮径するテーパー部となっている。ノズル部２３は、注射針等の医療用具の接続が可能なものとなっている。さらに、この実施例の外筒２０では、シールキャップ（図示せず）が螺合するためのノズル部側螺合部２３ａと、シールキャップと係合するためのノズル部側係合部２３ｂが設けられている。 As shown in FIG. 8, the nozzle portion 23 has an opening (liquid discharge port) 25 at the tip thereof, and has a tubular portion having a diameter smaller than that of the outer cylinder main body portion 21. Further, the nozzle portion 23 is a tapered portion whose diameter is reduced toward the tip side. The nozzle portion 23 is capable of connecting a medical device such as an injection needle. Further, in the outer cylinder 20 of this embodiment, a nozzle portion side screwing portion 23a for screwing the seal cap (not shown) and a nozzle portion side engaging portion 23b for engaging with the seal cap are provided. Has been done.

外筒２０は、図８に示すように、基端テーパー部２９を備えている。基端テーパー部２９は、外筒２０のほぼ基端より、所定長先端側に延びるものとなっている。そして、基端テーパー部２９の傾き（外筒２０の中心軸と基端テーパー部２９間の角度）は、５〜２０°であることが好ましく、特に、１０〜１５°であることが好ましい。また、基端テーパー部２９の長さは、１．０〜３．０ｍｍであることが好ましい。また、基端テーパー部２９が形成されている部分は、図８に示すように、外筒本体部２１より若干肉厚部となっていることが好ましい。両者の肉厚差としては、０．０１〜０．３５ｍｍが好ましい。 As shown in FIG. 8, the outer cylinder 20 includes a base end tapered portion 29. The base end tapered portion 29 extends from the substantially base end of the outer cylinder 20 toward the tip end side having a predetermined length. The inclination of the proximal end tapered portion 29 (the angle between the central axis of the outer cylinder 20 and the proximal end tapered portion 29) is preferably 5 to 20 °, particularly preferably 10 to 15 °. Further, the length of the base end tapered portion 29 is preferably 1.0 to 3.0 mm. Further, as shown in FIG. 8, it is preferable that the portion where the base end tapered portion 29 is formed is slightly thicker than the outer cylinder main body portion 21. The wall thickness difference between the two is preferably 0.01 to 0.35 mm.

外筒２０は、図８ないし図１０に示すように、基端テーパー部２９より先端側に設けられた内面リブ２７を備えている。この実施例では、内面リブ２７は、環状内面リブ２７となっている。筒状本体部２１の内面に対する内面リブ２７の高さは、０．１０〜０．３０ｍｍであることが好ましく、特に、０．１〜０．１５ｍｍであることが好ましい。また、環状内面リブ２７は、頂部および後端側が湾曲面となっていることが好ましい。また、環状内面リブ２７の先端部は、傾斜部となっていることが好ましい。この環状内面リブ２７は、後述する射出成形用金型１のコア３に形成された外面凹部７（外面凹部７）により形成され、外面凹部７の形状に対応した形状を有するものとなっている。 As shown in FIGS. 8 to 10, the outer cylinder 20 includes an inner rib 27 provided on the tip side of the base end tapered portion 29. In this embodiment, the inner surface rib 27 is an annular inner surface rib 27. The height of the inner surface rib 27 with respect to the inner surface of the tubular main body 21 is preferably 0.10 to 0.30 mm, and particularly preferably 0.1 to 0.15 mm. Further, it is preferable that the annular inner surface rib 27 has a curved surface at the top and the rear end side. Further, it is preferable that the tip portion of the annular inner surface rib 27 is an inclined portion. The annular inner surface rib 27 is formed by an outer surface recess 7 (outer surface recess 7) formed in the core 3 of the injection molding die 1 described later, and has a shape corresponding to the shape of the outer surface recess 7. ..

そして、この実施例の外筒２０は、環状内面リブ２７の基端と連続し、基端側に位置する内面凹部２８を備えている。この実施例では、内面凹部２８は、環状内面凹部２８となっている。この内面凹部２８は、後述する射出成形用金型１のコア３に形成された外面リブ８（環状外面リブ８）により形成され、外面リブ８の形状に対応した形状を有するものとなっている。 The outer cylinder 20 of this embodiment includes an inner surface recess 28 that is continuous with the base end of the annular inner surface rib 27 and is located on the base end side. In this embodiment, the inner surface recess 28 is an annular inner surface recess 28. The inner surface recess 28 is formed by an outer surface rib 8 (annular outer surface rib 8) formed in the core 3 of the injection molding die 1 described later, and has a shape corresponding to the shape of the outer surface rib 8. ..

筒状本体部２１の内面に対する内面凹部２８の深さは、内面リブ２７の高さより大きいものが好ましい。具体的には、筒状本体部２１の内面に対する内面凹部２８の深さは、０．１５〜０．３５ｍｍであることが好ましく、特に、０．２０〜０．２５ｍｍであることが好ましい。また、筒状本体部２１の内面に対する内面凹部２８の深さは、内面リブ２７の高さより、０．０５〜０．２５ｍｍ大きいものが好ましく、特に、０．１０〜０．１５ｍｍ大きいものが好ましい。 The depth of the inner surface recess 28 with respect to the inner surface of the tubular main body 21 is preferably larger than the height of the inner surface rib 27. Specifically, the depth of the inner surface recess 28 with respect to the inner surface of the tubular main body 21 is preferably 0.15 to 0.35 mm, and particularly preferably 0.25 to 0.25 mm. Further, the depth of the inner surface recess 28 with respect to the inner surface of the tubular main body 21 is preferably 0.05 to 0.25 mm larger than the height of the inner rib 27, and particularly preferably 0.10 to 0.15 mm larger. ..

また、環状内面凹部２８は、先端部および頂部は、湾曲面となっていることが好ましい。また、環状内面凹部２８の基端部は、傾斜部となっていることが好ましい。
さらに、この実施例の外筒２０は、内面凹部２８の基端側に設けられた基端テーパー部２９を有し、内面凹部２８の基端と基端テーパー部２９の先端間の境界部に設けられた凸部２９ａを備えている。Further, it is preferable that the tip portion and the top portion of the annular inner surface recess 28 are curved surfaces. Further, it is preferable that the base end portion of the annular inner surface recess 28 is an inclined portion.
Further, the outer cylinder 20 of this embodiment has a proximal end tapered portion 29 provided on the proximal end side of the inner surface concave portion 28, and is located at a boundary portion between the proximal end of the inner surface concave portion 28 and the distal end of the proximal end tapered portion 29. The convex portion 29a provided is provided.

また、フランジ部２４は、図８に示すように、外筒本体部２１の基端全周より垂直方向に突出するように形成された楕円ドーナツ状の円盤部となっている。フランジ部２４は、幅広となった２つの把持部を備え、さらに、把持部の先端面側には、複数のリブが形成されている。また、図８に示すように、フランジ部２４の基端面は、周縁および外筒基端のリブ部分以外となる部分は凹部となっている。また、フランジ部２４の内面に上述した基端テーパー部２９、環状凹部２８が形成されている。 Further, as shown in FIG. 8, the flange portion 24 is an elliptical donut-shaped disk portion formed so as to project in the vertical direction from the entire circumference of the base end of the outer cylinder main body portion 21. The flange portion 24 includes two wide grip portions, and a plurality of ribs are formed on the tip end surface side of the grip portion. Further, as shown in FIG. 8, the base end surface of the flange portion 24 has a concave portion other than the rib portion of the peripheral edge and the base end of the outer cylinder. Further, the base end tapered portion 29 and the annular recess 28 described above are formed on the inner surface of the flange portion 24.

外筒２０の形成材料としては、薬剤吸着性、酸素透過性、水蒸気透過性の少ない材料、また、耐γ線性、耐オートクレーブ性など耐滅菌性に優れているものが好ましい。シリンジ用外筒２０の形成材料としては、ポリプロピレン、ポリエチレン、ポリスチレン、ポリアミド、ポリカーボネート、ポリ塩化ビニル、ポリ−（４−メチルペンテン−１）、アクリル樹脂、アクリロニトリル−ブタジエン−スチレン共重合体、ポリエチレンテレフタレート等のポリエステル、環状ポリオレフィンのような各種樹脂が挙げられるが、その中でも成形が容易で耐熱性があることから、ポリプロピレン、環状ポリオレフィンのような樹脂が好ましい。 As the material for forming the outer cylinder 20, a material having low chemical adsorption, oxygen permeability, and water vapor permeability, and a material having excellent sterilization resistance such as γ-ray resistance and autoclave resistance are preferable. Examples of the material for forming the outer cylinder 20 for the syringe include polypropylene, polyethylene, polystyrene, polyamide, polycarbonate, polyvinyl chloride, poly- (4-methylpentene-1), acrylic resin, acrylonitrile-butadiene-styrene copolymer, and polyethylene terephthalate. Examples thereof include various resins such as polyester and cyclic polyolefin, but among them, resins such as polypropylene and cyclic polyolefin are preferable because they are easy to mold and have heat resistance.

そして、射出成形用金型１は、図１ないし図５に示すように、外側金型２、コア３と、外側底部金型１４とを備えている。外側金型内（具体的には、外側金型２および外側底部金型１４内）にコア３を挿入することにより外側金型の内面とコアの外面との間にはシリンジ用外筒成形物が成形される空隙１０が形成される。 Then, as shown in FIGS. 1 to 5, the injection molding die 1 includes an outer die 2, a core 3, and an outer bottom die 14. By inserting the core 3 into the outer mold (specifically, inside the outer mold 2 and the outer bottom mold 14), an outer cylinder molded product for a syringe is placed between the inner surface of the outer mold and the outer surface of the core. The void 10 in which the is formed is formed.

外側金型２は、図１ないし図５に示すように、外筒本体部形成部４ａと、ノズル部形成部５と、フランジ部形成部１１と、溶融樹脂注入ゲート１６とを備えている。
外筒本体部形成部４ａは、ほぼ円筒状内面を有する。なお、外筒本体部形成部４ａは、僅かに縮径するテーパー部を有するものが好ましいが、このような、抜き勾配を持たないものであってもよい。As shown in FIGS. 1 to 5, the outer mold 2 includes an outer cylinder body portion forming portion 4a, a nozzle portion forming portion 5, a flange portion forming portion 11, and a molten resin injection gate 16.
The outer cylinder main body forming portion 4a has a substantially cylindrical inner surface. The outer cylinder main body forming portion 4a preferably has a tapered portion having a slightly reduced diameter, but may not have such a draft.

ノズル部形成部５は、本体部形成部４ａの先端側に設けられ、先端に液体排出口を有するノズル部２３の外面形状を形成する部分である。ノズル部形成部５は、この実施例においては、先端側に向かってテーパー状に縮径するように形成され、先端部には、液体排出口２５の先端面を形成する形成部５ａが設けられ、基端部には、先端側から順にノズル部側螺合部２３ａの形成部５ｂと、ノズル部側係合部２３ｂの形成部５ｃが設けられている。 The nozzle portion forming portion 5 is a portion provided on the tip end side of the main body portion forming portion 4a and forming an outer surface shape of the nozzle portion 23 having a liquid discharge port at the tip end. In this embodiment, the nozzle portion forming portion 5 is formed so as to taper toward the tip end side, and the tip portion is provided with a forming portion 5a forming the tip surface of the liquid discharge port 25. The base end portion is provided with a forming portion 5b of the nozzle portion side screwing portion 23a and a forming portion 5c of the nozzle portion side engaging portion 23b in order from the tip end side.

この実施例では、溶融樹脂注入ゲート１６は、図２に示すように、外筒本体部形成部４ａの基端部に近接するように形成されたフランジ部形成部１１の側面（具体的には、外側面）に形成されている。なお、ゲート１６の位置はこれ限られることはなく、例えば本体部形成部４ａの側面またはノズル部側係合部２３ｂの形成部５ｃの側面等にあってもよい。なお、溶融樹脂注入ゲート１６と連通する樹脂流路１７は、外側金型２に設けられている。なお、溶融樹脂注入ゲート１６と連通する樹脂流路１７は、外側金型２と外側底部金型１４間により形成されているものであってもよい。 In this embodiment, as shown in FIG. 2, the molten resin injection gate 16 is a side surface (specifically, specifically) of the flange portion forming portion 11 formed so as to be close to the base end portion of the outer cylinder main body portion forming portion 4a. , Outer surface). The position of the gate 16 is not limited to this, and may be, for example, on the side surface of the main body portion forming portion 4a or the side surface of the forming portion 5c of the nozzle portion side engaging portion 23b. The resin flow path 17 communicating with the molten resin injection gate 16 is provided in the outer mold 2. The resin flow path 17 communicating with the molten resin injection gate 16 may be formed between the outer mold 2 and the outer bottom mold 14.

そして、この実施例では、溶融樹脂注入ゲート１６は、フランジ部形成部１１の把持部連結部形成部の側面の中央部分（具体的には、外筒本体部形成部４ａの中心軸に対応する位置）に形成されている。具体的には、溶融樹脂注入ゲート１６は、図２に示すように、フランジ部形成部１１の側面でありかつ若干基端側となる位置に形成されている。
また、この実施例のように溶融樹脂注入ゲート１６がフランジ部形成部１１に設けられていることにより、溶融樹脂が注入された際にコールドスラッグがフランジ部形成部１１内に留まるため注入された溶融樹脂の流れが乱されることがない。Then, in this embodiment, the molten resin injection gate 16 corresponds to the central portion of the side surface of the grip portion connecting portion forming portion of the flange portion forming portion 11 (specifically, the central axis of the outer cylinder main body portion forming portion 4a). Position) is formed. Specifically, as shown in FIG. 2, the molten resin injection gate 16 is formed at a position on the side surface of the flange portion forming portion 11 and slightly on the proximal end side.
Further, since the molten resin injection gate 16 is provided in the flange portion forming portion 11 as in this embodiment, the cold slug stays in the flange portion forming portion 11 when the molten resin is injected. The flow of molten resin is not disturbed.

フランジ部形成部１１は、本体部形成部４ａの基端部に形成され上述したようなフランジ部２４の外面形状を形成する部分となっている。
また、外側金型２には、金型内のエアもしくはガスがスムースに抜けるようにエアベントを設けることが好ましい（図示せず）。
外側底部金型１４は、外筒２０のフランジ部２４の基端形状を形成するためのものである。そして、外側底部金型１４は、上面にフランジ部２４の基端形状を形成するための形成部１２を備えている。また、この実施例では、外側底部金型１４は、後述するコア３を挿通するための貫通路を備えている。The flange portion forming portion 11 is a portion formed at the base end portion of the main body portion forming portion 4a and forming the outer surface shape of the flange portion 24 as described above.
Further, it is preferable that the outer mold 2 is provided with an air vent so that the air or gas in the mold can be smoothly released (not shown).
The outer bottom mold 14 is for forming the base end shape of the flange portion 24 of the outer cylinder 20. The outer bottom mold 14 is provided with a forming portion 12 on the upper surface for forming the base end shape of the flange portion 24. Further, in this embodiment, the outer bottom mold 14 is provided with a gangway for inserting the core 3 described later.

この実施例では、コア３は、図１ないし図５に示すように、外筒２０の内側形状を形成するための外面部６を備え、外面部６は、外筒本体部形成部６ａと、先端部形成部６ｂと、基端側拡径テーパー部９を備えている。さらに、外面部６は、外筒本体部形成部６ａの基端部に位置する外面凹部７を備えている。この外面凹部７は、外筒２０の基端部内部の内面リブ２７を形成するためのものである。言い換えれば、この外面凹部７より先端側が、外筒本体部形成部６ａとなっている。 In this embodiment, as shown in FIGS. 1 to 5, the core 3 includes an outer surface portion 6 for forming the inner shape of the outer cylinder 20, and the outer surface portion 6 includes an outer cylinder main body portion forming portion 6a. It includes a tip forming portion 6b and a base end side enlarged diameter tapered portion 9. Further, the outer surface portion 6 is provided with an outer surface recess 7 located at the base end portion of the outer cylinder main body portion forming portion 6a. The outer surface recess 7 is for forming an inner surface rib 27 inside the base end portion of the outer cylinder 20. In other words, the tip side of the outer surface recess 7 is the outer cylinder main body forming portion 6a.

この実施例では、外面凹部７は、環状外面凹部７となっている。このような環状凹部であることが好ましいが、外面凹部は、コアの中心軸に対して直交する同一の円周上領域に設けられた複数の非連続凹部であってもよい。そして、コア３の本体部形成部６ａの最大外径部に対するコア３の外面凹部７の深さＤ（図５参照）は、０．１０〜０．３０ｍｍであることが好ましく、特に、０．１０〜０．１５ｍｍであることが好ましい。また、外面凹部７の軸方向長Ｌ（図５参照）は、１．５〜３．５ｍｍであることが好ましく、特に、２．０〜３．０ｍｍであることが好ましい。 In this embodiment, the outer surface recess 7 is an annular outer surface recess 7. Such an annular recess is preferable, but the outer recess may be a plurality of discontinuous recesses provided in the same circumferential region orthogonal to the central axis of the core. The depth D (see FIG. 5) of the outer surface recess 7 of the core 3 with respect to the maximum outer diameter portion of the main body forming portion 6a of the core 3 is preferably 0.10 to 0.30 mm, and in particular, 0. It is preferably 10 to 0.15 mm. Further, the axial length L (see FIG. 5) of the outer surface recess 7 is preferably 1.5 to 3.5 mm, and particularly preferably 2.0 to 3.0 mm.

そして、外面凹部７と外筒本体部形成部６ａとの境界部７０、言い換えれば、外面凹部７の先端と外筒本体部形成部６ａの基端の境界部は、角のない丸みを帯びたものとなっている。また、外面凹部７は、基端方向に向かって窪んで行く先端側部分７１を備えている。特に、この実施例では、先端側部分７１は、基端方向に向かって内側に傾斜する先端側傾斜部となっている。そして、この実施例の外面凹部７は、上記の先端側部分である先端側傾斜部７１と、湾曲底部７２と、湾曲底部７２と連続し、基端方向に延びかつ深さが徐々に小さくなる基端部７３を備えている。具体的には、境界部７０と連続し基端側に延びる先端側傾斜部７１と、先端側傾斜部７１と連続し、丸みを帯びた底部７２と、底部７２と連続し、丸みを帯びた基端部７３を有するものとなっている。先端側傾斜部７１は、基端方向に向かって縮径する環状傾斜部となっている。また、図５に示す本体部形成部６ａの外面の基端方向延長線Sと外面凹部７の先端側部分（先端側傾斜部）７１間は、傾斜角度αを有するものとなっている。傾斜角度αとしては、１０〜３０度が好ましく、特に、１０〜１５度が好ましい。 The boundary 70 between the outer surface recess 7 and the outer cylinder body forming portion 6a, in other words, the boundary between the tip of the outer surface recess 7 and the base end of the outer cylinder body forming portion 6a is rounded without corners. It has become a thing. Further, the outer surface recess 7 includes a tip end side portion 71 that is recessed toward the proximal end direction. In particular, in this embodiment, the tip end side portion 71 is a tip end side inclined portion that inclines inward toward the proximal end direction. The outer surface recess 7 of this embodiment is continuous with the tip end side inclined portion 71, the curved bottom portion 72, and the curved bottom portion 72, which are the tip end side portions, and extends in the proximal direction and gradually decreases in depth. A base end portion 73 is provided. Specifically, the tip side inclined portion 71 which is continuous with the boundary portion 70 and extends toward the base end side, the tip side inclined portion 71, and the rounded bottom portion 72 and the bottom portion 72 are continuous and rounded. It has a base end portion 73. The tip-side inclined portion 71 is an annular inclined portion whose diameter is reduced toward the proximal end. Further, the extension line S in the base end direction of the outer surface of the main body portion forming portion 6a shown in FIG. 5 and the tip end side portion (tip side inclined portion) 71 of the outer surface recess 7 have an inclination angle α. The inclination angle α is preferably 10 to 30 degrees, and particularly preferably 10 to 15 degrees.

この実施例では、コア３は、図１ないし図５に示すように、外面部６は、外筒本体部形成部６ａの基端部に位置し、かつ、外面凹部７に近接しかつ基端側に設けられた外面リブ８を備えている。この外面リブ８は、外筒２０の基端部内部の内面凹部２８を形成するためのものである。そして、この外面リブ８より、基端側が基端側拡径テーパー部９となっている。そして、コア３の本体部形成部６ａの最大外径部に対するコア３の外面リブ８の高さＨ（図５参照）は、０．１５〜０．３５ｍｍであることが好ましく、特に、０．２０〜０．２５ｍｍであることが好ましい。また、外面リブ８の軸方向長Ｍ（図５参照）は、１．５〜３．５ｍｍであることが好ましく、特に、１．５〜２．５ｍｍであることが好ましい。 In this embodiment, as shown in FIGS. 1 to 5, the outer surface portion 6 of the core 3 is located at the base end portion of the outer cylinder body portion forming portion 6a, and is close to the outer surface recess 7 and at the base end. It is provided with an outer surface rib 8 provided on the side. The outer surface rib 8 is for forming an inner surface recess 28 inside the base end portion of the outer cylinder 20. The base end side of the outer surface rib 8 is a base end side diameter-expanded tapered portion 9. The height H (see FIG. 5) of the outer surface rib 8 of the core 3 with respect to the maximum outer diameter portion of the main body portion forming portion 6a of the core 3 is preferably 0.15 to 0.35 mm, and in particular, 0. It is preferably 20 to 0.25 mm. Further, the axial length M (see FIG. 5) of the outer surface rib 8 is preferably 1.5 to 3.5 mm, and particularly preferably 1.5 to 2.5 mm.

この実施例では、コア３は、図１ないし図５に示すように、外面凹部７の基端と外面リブ８の先端との境界部７８は、段差を持たず、スムーズに連続するものとなっている。また、外面リブ８は、先端方向に向かって膨らんでいく基端側部分８１を備えている。特に、この実施例では、基端側部分８１は、先端方向に向かって外側に傾斜する基端側傾斜部８１となっている。そして、この実施例のコア３では、外面リブ８は、基端側傾斜部８１と、湾曲頂部８２と、湾曲頂部８２と連続し、先端方向に延びかつ突出高さが徐々に小さくなる先端部８３を備えている。 In this embodiment, as shown in FIGS. 1 to 5, the boundary portion 78 between the base end of the outer surface recess 7 and the tip end of the outer surface rib 8 has no step and is smoothly continuous. ing. Further, the outer surface rib 8 includes a base end side portion 81 that swells toward the tip end direction. In particular, in this embodiment, the proximal end side portion 81 is a proximal end side inclined portion 81 that inclines outward toward the tip end direction. Then, in the core 3 of this embodiment, the outer surface rib 8 is continuous with the base end side inclined portion 81, the curved top portion 82, and the curved top portion 82, and extends in the tip direction and the protruding height gradually decreases. It is equipped with 83.

具体的には、外面リブ８は、丸みを帯びた先端部８３と、先端部８３と連続し、丸みを帯びた頂部８２と、頂部８２と連続する基端側傾斜部８１を有している。基端側傾斜部８１は、基端方向に向かって縮径する環状傾斜部となっている。特に、外面リブ８は、頂部から基端まで、エッジ、段差などを持たないことが好ましい。また、この実施例では、外面リブ８は、環状外面リブ８となっている。このような環状リブであることが好ましいが、外面リブは、コアの中心軸に対して直交する同一の円周上領域に設けられた複数の非連続凹部であってもよい。なお、この場合、外面リブは、外面凹部の基端側に位置し、かつ外面凹部の周方向長と同じ長さを少なくとも有するものとなる。 Specifically, the outer surface rib 8 has a rounded tip portion 83, a rounded top portion 82 continuous with the tip portion 83, and a proximal end side inclined portion 81 continuous with the top portion 82. .. The base end side inclined portion 81 is an annular inclined portion whose diameter is reduced toward the base end direction. In particular, it is preferable that the outer surface rib 8 has no edge, step, or the like from the top to the base end. Further, in this embodiment, the outer surface rib 8 is an annular outer surface rib 8. Such an annular rib is preferable, but the outer rib may be a plurality of discontinuous recesses provided in the same circumferential region orthogonal to the central axis of the core. In this case, the outer surface rib is located on the base end side of the outer surface recess and has at least the same length as the circumferential length of the outer surface recess.

さらに、この実施例のコア３では、図５に示すように、外面リブ８の高さＨは、外面凹部７の深さＤより大きいものとなっている。そして、外面リブ８の高さＨは、外面凹部７の深さＤより、０．０５〜０．２５ｍｍ大きいことが好ましく、特に、０．１０〜０．１５ｍｍ大きいことが好ましい。 Further, in the core 3 of this embodiment, as shown in FIG. 5, the height H of the outer surface rib 8 is larger than the depth D of the outer surface recess 7. The height H of the outer surface rib 8 is preferably 0.05 to 0.25 mm larger than the depth D of the outer surface recess 7, and is particularly preferably 0.10 to 0.15 mm larger.

また、図５に示す本体部形成部６ａの外面の基端方向延長線Sと外面リブ８の後部傾斜部８１間は、傾斜角度βを有するものとなっている。傾斜角度βとしては、１５〜３５度が好ましく、特に、１５〜２０度が好ましい。そして、本発明のコア３では、本体部形成部６ａの外面の基端方向延長線Ｓと外面リブ８の基端側部分７１間の傾斜角度βは、本体部形成部６ａの外面の基端方向延長線Ｓと外面凹部７の先端側傾斜部７１間の傾斜角度αより大きいものとなっている。そして、傾斜角度βは、傾斜角度αより、５〜２５度大きいことが好ましく、特に、５〜１５度大きいことが好ましい。 Further, the extension line S in the proximal direction of the outer surface of the main body portion forming portion 6a shown in FIG. 5 and the rear inclined portion 81 of the outer surface rib 8 have an inclination angle β. The inclination angle β is preferably 15 to 35 degrees, and particularly preferably 15 to 20 degrees. In the core 3 of the present invention, the inclination angle β between the extension line S in the proximal direction of the outer surface of the main body forming portion 6a and the proximal end side portion 71 of the outer surface rib 8 is the proximal end of the outer surface of the main body forming portion 6a. The inclination angle α between the direction extension line S and the tip-side inclined portion 71 of the outer surface recess 7 is larger than that. The inclination angle β is preferably 5 to 25 degrees larger than the inclination angle α, and particularly preferably 5 to 15 degrees larger.

そして、コア３は、基端側拡径テーパー部９を備えている。この基端側拡径テーパー部９は、内面リブ８より基端側に形成され、外筒２０の基端テーパー部２９を形成するための部位である。そして、この実施例では、 基端側拡径テーパー部９は、フランジ部形成部１１となる部分内面を形成する部位に設けられている。基端側拡径テーパー部９の軸方長は、１．０〜３．０ｍｍであることが好ましく、特に、１．５〜２．５ｍｍであることが好ましい。また、基端側拡径テーパー部９の本体部形成部６ａの外面の基端方向延長線Ｓに対する傾きは、０．３〜２°であることが好ましく、特に、０．５〜１°であることが好ましい。 The core 3 is provided with a base end side diameter-expanded tapered portion 9. The base end side enlarged diameter tapered portion 9 is formed on the base end side from the inner surface rib 8 and is a portion for forming the base end tapered portion 29 of the outer cylinder 20. Then, in this embodiment, the base end side diameter-expanded tapered portion 9 is provided at a portion forming the inner surface of the portion to be the flange portion forming portion 11. The axial length of the base end side enlarged taper portion 9 is preferably 1.0 to 3.0 mm, and particularly preferably 1.5 to 2.5 mm. Further, the inclination of the outer surface of the main body portion forming portion 6a of the proximal end side enlarged taper portion 9 with respect to the extension line S in the proximal end direction is preferably 0.3 to 2 °, particularly 0.5 to 1 °. It is preferable to have.

そして、コア３に設けられる外面凹部および外面リブは、図３ないし図５に示すように、外面凹部７および内面リブ８であることが好ましい。しかし、これに限定されるものではなく、外面凹部および外面リブは、図６に示す実施例の金型１ａが備えるもののように、所定長円弧状に延びる複数の円弧状外面凹部７ａ、７ｂおよび円弧状外面リブ８ａ、８ｂからなるものであってもよい。円弧状外面凹部７ａと円弧状外面リブ８ａは、一体に形成されかつ同じ周方向長を有しており、同様に、円弧状外面凹部７ｂと円弧状外面リブ８ｂも、一体に形成されかつ同じ周方向長を有している。この実施例金型１ａでは、円弧状外面リブおよび外面凹部間に形成された、凹部およびリブ非存在部８５を有している。 The outer surface recess and the outer surface rib provided in the core 3 are preferably the outer surface recess 7 and the inner surface rib 8 as shown in FIGS. 3 to 5. However, the present invention is not limited to this, and the outer surface recesses and the outer surface ribs are a plurality of arcuate outer surface recesses 7a, 7b and a plurality of arcuate outer surface recesses 7a, 7b extending in a predetermined long arc shape, as in the mold 1a of the embodiment shown in FIG. It may be composed of arcuate outer surface ribs 8a and 8b. The arc-shaped outer surface recess 7a and the arc-shaped outer surface rib 8a are integrally formed and have the same circumferential length. Similarly, the arc-shaped outer surface recess 7b and the arc-shaped outer surface rib 8b are integrally formed and have the same circumferential length. It has a circumferential length. The mold 1a of this embodiment has a recess and a rib-free portion 85 formed between the arcuate outer surface rib and the outer surface recess.

さらには、コア３に設けられる外面凹部および外面リブは、図７に示す実施例の金型１ｂが備えるもののように、所定長円弧状に延びる短い多数の円弧状外面凹部７０ａ，７０ｂ，７０ｃ，７０ｄおよび円弧状外面リブ８０ａ，８０ｂ，８０ｃ，８０ｄ，８０ｅからなるものであってもよい。円弧状外面凹部７０ａと円弧状外面リブ８０ａは、一体に形成されかつ同じ周方向長を有しており、同様に、他の円弧状外面凹部７０ｂ、７０ｃ、７０ｄ、７０ｅと円弧状外面リブ８０ｂ，８０ｃ，８０ｄ，８０ｅも、一体に形成されかつ同じ周方向長を有している。この実施例金型１ｂにおいても、円弧状外面リブおよび外面凹部間に形成された、凹部およびリブ非存在部８５ａ，８５ｂ，８５ｃ，８５ｄを有している。 Further, the outer surface recesses and the outer surface ribs provided in the core 3 have a large number of short arcuate outer surface recesses 70a, 70b, 70c, which extend in a predetermined long arc shape, as provided in the mold 1b of the embodiment shown in FIG. It may be composed of 70d and arcuate outer surface ribs 80a, 80b, 80c, 80d, 80e. The arc-shaped outer surface recess 70a and the arc-shaped outer surface rib 80a are integrally formed and have the same circumferential length. Similarly, the other arc-shaped outer surface recesses 70b, 70c, 70d, 70e and the arc-shaped outer surface rib 80b are formed. , 80c, 80d, 80e are also integrally formed and have the same circumferential length. The mold 1b of this embodiment also has recesses and rib-free portions 85a, 85b, 85c, and 85d formed between the arcuate outer surface ribs and the outer surface recesses.

次に、本発明の脂成形体の射出成形用金型の作用について説明する。
図１および図２に示すよう、外側金型内にコアが挿入された状態にて、ゲートより溶融樹脂が注入される。そして、樹脂をある程度の温度まで冷却した後、外側金型より、コアを引き抜く。本発明の金型では、コア３が、外面凹部７および外面リブ８を有することにより、成形物２０は、コア３に確実に保持されるため、引き抜き時における成形物２０の外側金型内への残留がない。Next, the operation of the injection molding die of the fat molded body of the present invention will be described.
As shown in FIGS. 1 and 2, the molten resin is injected from the gate with the core inserted in the outer mold. Then, after cooling the resin to a certain temperature, the core is pulled out from the outer mold. In the mold of the present invention, since the core 3 has the outer surface recess 7 and the outer surface rib 8, the molded product 20 is surely held by the core 3, so that the molded product 20 is inserted into the outer mold of the molded product 20 at the time of drawing. There is no residue.

続いて、成形物２０より、コア３を離脱する。この作業は、図９および図１０に示すように、成形物２０より、コア３を引き抜くことにより行われる。本発明の樹脂成形体の射出成形用金型１では、コア３が、外面凹部７と外面リブ８の両者を備え、かつ、コア３の本体部形成部の外面の基端方向延長線と外面リブ８の基端側部分間の傾斜角度βは、本体部形成部の外面の基端方向延長線と外面凹部７の先端側部分間の傾斜角度αより大きく、外面リブの高さＨは、外面凹部の深さＤより大きいものとなっている。 Subsequently, the core 3 is detached from the molded product 20. This work is performed by pulling out the core 3 from the molded product 20, as shown in FIGS. 9 and 10. In the injection molding die 1 of the resin molded product of the present invention, the core 3 includes both the outer surface recess 7 and the outer surface rib 8, and the extension line and the outer surface in the base end direction of the outer surface of the main body portion forming portion of the core 3 The inclination angle β between the base end side portions of the rib 8 is larger than the inclination angle α between the extension line in the base end direction of the outer surface of the main body forming portion and the tip end side portion of the outer surface recess 7, and the height H of the outer surface rib is. It is larger than the depth D of the outer surface recess.

このため、図９に示すように、成形物２０からのコア３の抜去時において、コア３が、矢印方向（下方）に移動することにより、大きい傾斜角度βを有し、かつ高い突出高を有する外面リブ８が、成形物２０の基端部を、矢印方向（側面外方）に押し広げる。この外面リブによる押し広げにより、コア３の外面凹部の先端（境界部）７０を含む全体は、成形物２０の内面リブ２７より徐々に離間する。 Therefore, as shown in FIG. 9, when the core 3 is removed from the molded product 20, the core 3 moves in the direction of the arrow (downward), so that the core 3 has a large inclination angle β and a high protrusion height. The outer surface rib 8 to hold pushes the base end portion of the molded product 20 in the direction of the arrow (outside the side surface). Due to the expansion by the outer surface rib, the entire core 3 including the tip (boundary portion) 70 of the outer surface recess is gradually separated from the inner surface rib 27 of the molded product 20.

そして、図１０に示すように、コア３の外面リブ８の頂部付近が、成形物２０の内面凹部２８の基端を押し広げる状態では、コア３の外面凹部の先端（境界部）７０およびコア３の本体部形成部４ａは、成形物２０の内面と十分に離間し、この状態にて、コアの外面凹部が、成形物の内面リブを通過する。このため、コアの外面凹部７の先端７０および先端側傾斜部７１が、成形物２０の内面リブ２７に接触することがなく、コア抜去時における成形物の内面リブの損傷が極めて少ない。 Then, as shown in FIG. 10, in a state where the vicinity of the top of the outer surface rib 8 of the core 3 pushes out the base end of the inner surface recess 28 of the molded product 20, the tip (boundary portion) 70 of the outer surface recess of the core 3 and the core The main body portion forming portion 4a of No. 3 is sufficiently separated from the inner surface of the molded product 20, and in this state, the outer surface recess of the core passes through the inner surface rib of the molded product. Therefore, the tip 70 of the outer surface recess 7 of the core and the tip end side inclined portion 71 do not come into contact with the inner surface rib 27 of the molded product 20, and the inner surface rib of the molded product is damaged very little when the core is removed.

本発明の樹脂成形体の射出成形用金型は、以下のものである。
（１） 基端部内面に設けられた内面リブと、前記内面リブより基端側に位置する内面凹部とを備える樹脂成形体のための射出成形用金型であって、
前記射出成形用金型は、前記樹脂成形体の外側形状を形成するための外側金型と、前記外側金型内に挿入され、前記樹脂成形体の内側形状を形成するためのコアとを備え、前記外側金型は、前記樹脂成形体の外側形状を形成するための内面部と、前記外側金型と前記コア間の空隙に溶融樹脂を注入するための溶融樹脂注入ゲートとを備え、
前記コアは、前記樹脂成形体の内側形状を形成するための外面部を備え、前記外面部は、前記内面リブを形成するための外面凹部と、前記外面凹部より先端側に設けられ、前記樹脂成形体の本体部の内面を形成する本体部形成部と、前記樹脂成形体の先端部の内面を形成する先端部形成部と、前記外面凹部より基端側に形成され、前記内面凹部を形成するための外面リブとを備え、
前記本体部形成部の外面の基端方向延長線と前記外面リブの基端側部分間の傾斜角度βは、前記本体部形成部の外面の基端方向延長線と前記外面凹部の先端側部分間の傾斜角度αより大きく、前記外面リブの高さＨは、前記外面凹部の深さＤより大きいものとなっている樹脂成形体の射出成形用金型。The injection molding die of the resin molded product of the present invention is as follows.
(1) An injection molding die for a resin molded body having an inner surface rib provided on the inner surface of the base end portion and an inner surface concave portion located on the base end side of the inner surface rib.
The injection molding die includes an outer mold for forming the outer shape of the resin molded body and a core inserted into the outer mold to form the inner shape of the resin molded body. The outer mold includes an inner surface portion for forming the outer shape of the resin molded body and a molten resin injection gate for injecting the molten resin into the gap between the outer mold and the core.
The core includes an outer surface portion for forming the inner shape of the resin molded body, and the outer surface portion is provided with an outer surface recess for forming the inner surface rib and a tip side from the outer surface recess, and the resin. The main body forming portion forming the inner surface of the main body portion of the molded body, the tip forming portion forming the inner surface of the tip portion of the resin molded body, and the tip forming portion formed on the base end side from the outer surface recess to form the inner surface recess. With outer ribs for
The inclination angle β between the extension line in the proximal direction of the outer surface of the main body portion forming portion and the proximal end side portion of the outer surface rib is the extension line in the proximal end direction of the outer surface of the main body portion forming portion and the tip end side portion of the outer surface recess. A mold for injection molding of a resin molded body, which is larger than the inclination angle α between the two, and the height H of the outer surface rib is larger than the depth D of the outer surface recess.

この樹脂成形体の射出成形用金型では、コアが、外面凹部と外面リブの両者を備えている。このため、樹脂成形体形成用樹脂の射出後、外側金型より、コアを引き抜いた時、外側金型に成形物が残留することがなく、樹脂成形体を金型よりコアとともに確実に取り出すことができる。さらに、コアの本体部形成部の外面の基端方向延長線と外面リブの基端側部分間の傾斜角度βは、本体部形成部の外面の基端方向延長線と外面凹部の先端側部分間の傾斜角度αより大きく、外面リブの高さＨは、外面凹部の深さＤより大きいものとなっている。このため、成形物からのコアの抜去時において、大きい傾斜角度βを有し、かつ高い突出高を有する外面リブが、成形物の基端部を十分に押し広げた後、コアの外面凹部が、成形物の内面リブを通過する。このため、コアの外面凹部の先端が、成形物の内面リブに接触することを防止し、コア抜去時における成形物の内面リブの損傷が極めて少ない。 In the injection molding die of this resin molded product, the core includes both an outer surface recess and an outer surface rib. Therefore, when the core is pulled out from the outer mold after the resin for forming the resin molded product is injected, the molded product does not remain in the outer mold, and the resin molded product is surely taken out from the mold together with the core. Can be done. Further, the inclination angle β between the extension line in the proximal direction of the outer surface of the main body forming portion of the core and the proximal end side portion of the outer surface rib is the extension line in the proximal end direction of the outer surface of the main body forming portion and the tip end side portion of the outer surface recess. The inclination angle α between them is larger, and the height H of the outer surface rib is larger than the depth D of the outer surface recess. Therefore, when the core is removed from the molded product, the outer surface rib having a large inclination angle β and a high protrusion height sufficiently expands the base end portion of the molded product, and then the outer surface recess of the core is formed. , Passes through the inner ribs of the part. Therefore, the tip of the outer surface recess of the core is prevented from coming into contact with the inner surface rib of the molded product, and the inner surface rib of the molded product is extremely less damaged when the core is removed.

また、上記の実施態様は、以下のものであってもよい。
（２） 前記外面リブの高さＨは、前記外面凹部の深さＤより、０．０５〜０．２５ｍｍ大きいものとなっている上記（１）に記載の樹脂成形体の射出成形用金型。
（３） 前記外面リブの高さＨは、０．１５〜０．３５ｍｍであり、前記外面凹部の深さＤは、０．１０〜０．３０ｍｍである上記（２）に記載の樹脂成形体の射出成形用金型。
（４） 前記傾斜角度βは、前記傾斜角度αより、５〜２５度大きいものとなっている上記（１）ないし（３）のいずれかに記載の樹脂成形体の射出成形用金型。
（５） 前記傾斜角度βは、１５〜３５度であり、前記傾斜角度αは、１０〜３０度である上記（４）に記載の樹脂成形体の射出成形用金型。
（６） 前記外面リブは、前記基端側部分を形成する基端側傾斜部と、湾曲頂部と、前記湾曲頂部と連続し、先端方向に延びかつ突出高さが徐々に小さくなる先端部を備えている上記（１）ないし（５）のいずれかに記載の樹脂成形体の射出成形用金型。
（７） 前記外面凹部は、前記先端側部分を形成する先端側傾斜部と、湾曲底部と、前記湾曲底部と連続し、基端方向に延びかつ深さが徐々に小さくなる基端部を備えている上記（１）ないし（６）のいずれかに記載の樹脂成形体の射出成形用金型。
（８） 前記外面リブは、環状外面リブであり、前記外面凹部は、環状外面凹部である上記（１）ないし（７）のいずれに記載の樹脂成形体の射出成形用金型。
（９） 前記外面リブは、前記コアの中心軸に対して直交する同一の円周上領域に設けられた複数の非連続リブであり、前記外面凹部は、前記外面リブと対応するように形成され、かつ、前記コアの中心軸に対して直交する同一の円周上領域に設けられた複数の非連続リブである上記（１）ないし（７）のいずれに記載の樹脂成形体の射出成形用金型。
（１０） 前記外面リブの前記コアの軸方向長は、前記外面凹部の前記コアの軸方向長と同等もしくは長いものとなっている上記（１）ないし（９）のいずれかに記載の樹脂成形体の射出成形用金型。
（１１） 前記外側金型は、フランジ部を形成するためのフランジ部形成部を備え、前記溶融樹脂注入ゲートは、前記フランジ部形成部の側面に設けられている上記（１）ないし（１０）のいずれかに記載の樹脂成形体の射出成形用金型。
（１２） 前記樹脂成形体が、シリンジ用外筒である上記（１）ないし（１１）のいずれかに記載の樹脂成形体の射出成形用金型。Moreover, the above-mentioned embodiment may be as follows.
(2) The injection molding die for the resin molded product according to (1) above, wherein the height H of the outer surface rib is 0.05 to 0.25 mm larger than the depth D of the outer surface recess. ..
(3) The resin molded product according to (2) above, wherein the height H of the outer surface rib is 0.15 to 0.35 mm, and the depth D of the outer surface recess is 0.10 to 0.30 mm. Mold for injection molding.
(4) The injection molding die for a resin molded product according to any one of (1) to (3) above, wherein the inclination angle β is 5 to 25 degrees larger than the inclination angle α.
(5) The injection molding die for a resin molded product according to (4) above, wherein the inclination angle β is 15 to 35 degrees, and the inclination angle α is 10 to 30 degrees.
(6) The outer surface rib is continuous with the base end side inclined portion forming the base end side portion, the curved top portion, and the curved top portion, and extends toward the tip end direction and the protruding height gradually decreases. The injection molding die for the resin molded product according to any one of (1) to (5) above.
(7) The outer surface recess includes a tip-side inclined portion forming the tip-side portion, a curved bottom portion, and a base end portion which is continuous with the curved bottom portion and extends in the proximal end direction and gradually decreases in depth. The injection molding die for the resin molded product according to any one of (1) to (6) above.
(8) The injection molding die for a resin molded product according to any one of (1) to (7) above, wherein the outer surface rib is an annular outer surface rib, and the outer surface recess is an annular outer surface recess.
(9) The outer surface ribs are a plurality of discontinuous ribs provided in the same circumferential region orthogonal to the central axis of the core, and the outer surface recesses are formed so as to correspond to the outer surface ribs. The resin molded product according to any one of (1) to (7) above, which is a plurality of discontinuous ribs provided in the same circumferential region orthogonal to the central axis of the core. Mold.
(10) The resin molding according to any one of (1) to (9) above, wherein the axial length of the core of the outer surface rib is equal to or longer than the axial length of the core of the outer surface recess. Mold for injection molding of the body.
(11) The outer mold includes a flange portion forming portion for forming a flange portion, and the molten resin injection gate is provided on a side surface of the flange portion forming portion (1) to (10). Mold for injection molding of the resin molded product according to any one of.
(12) The injection molding die for a resin molded product according to any one of (1) to (11) above, wherein the resin molded product is an outer cylinder for a syringe.

また、本発明の樹脂成形体は、以下のものである。
（１３） 上記（１）ないし（１２）のいずれかに記載の樹脂成形体の射出成形用金型を用いて射出成形された樹脂成形体であって、前記樹脂成形体は、基端部内面に設けられた内面リブと、前記内面リブと近接しかつ基端側に位置する内面凹部と、前記内面凹部より基端側に位置し、基端に向かって拡径する基端テーパー部とを備える樹脂成形体。Further, the resin molded product of the present invention is as follows.
(13) A resin molded body injection-molded using the injection molding die of the resin molded body according to any one of (1) to (12) above, wherein the resin molded body has an inner surface of a base end portion. An inner surface rib provided on the inner surface rib, an inner surface recess located close to the inner surface rib and located on the proximal end side, and a proximal end tapered portion located on the proximal end side from the inner surface concave portion and expanding in diameter toward the proximal end. Resin molded body to be provided.

Claims (14)

先端部と、基端部と、前記基端部の内面に設けられた内面リブと、前記内面リブより前記基端部の基端側に位置する内面凹部とを備える筒状の樹脂成形体のための射出成形用金型であって、
前記射出成形用金型は、前記樹脂成形体の外側形状を形成するための外側金型と、前記外側金型内に挿入され、前記樹脂成形体の内側形状を形成するためのコアとを備え、前記外側金型は、前記樹脂成形体の外側形状を形成するための内面部と、前記外側金型と前記コア間の空隙に溶融樹脂を注入するための溶融樹脂注入ゲートとを備え、
前記コアは、前記樹脂成形体の内側形状を形成するための外面部を備え、前記外面部は、前記内面リブを形成するための外面凹部と、前記外面凹部より前記コアの先端側に設けられ、前記樹脂成形体の本体部の内面を形成する本体部形成部と、前記樹脂成形体の前記先端部の内面を形成する先端部形成部と、前記外面凹部より前記コアの基端側に形成され、前記内面凹部を形成するための外面リブとを備え、
前記本体部形成部の外面の基端方向延長線と前記外面リブの基端側部分間の傾斜角度βは、前記本体部形成部の外面の基端方向延長線と前記外面凹部の先端側部分間の傾斜角度αより大きく、前記外面リブの高さＨは、前記外面凹部の深さＤより大きいものとなっていることを特徴とする筒状の樹脂成形体の射出成形用金型。 And a distal end, a proximal end, wherein the inner surface ribs provided on the inner surface of the base end portion, said inner surface ribs than the proximal end cylindrical having an inner surface recess located on the proximal side of the resin molding It is a mold for injection molding for
The injection molding die includes an outer mold for forming the outer shape of the resin molded body and a core inserted into the outer mold to form the inner shape of the resin molded body. The outer mold includes an inner surface portion for forming the outer shape of the resin molded body and a molten resin injection gate for injecting the molten resin into the gap between the outer mold and the core.
The core includes an outer surface portion for forming the inner shape of the resin molded body, and the outer surface portion is provided with an outer surface recess for forming the inner surface rib and a tip side of the core from the outer surface recess. , forming a main body portion forming portion that forms the inner surface of the main body of the resin molded body, and a distal portion forming portion that forms the inner surface of the tip portion of the resin molded body, the base end side of the core from said outer surface recess And provided with an outer surface rib for forming the inner surface recess.
The inclination angle β between the extension line in the proximal direction of the outer surface of the main body portion forming portion and the proximal end side portion of the outer surface rib is the extension line in the proximal end direction of the outer surface of the main body portion forming portion and the tip end side portion of the outer surface recess. A mold for injection molding of a tubular resin molded body, which is larger than the inclination angle α between the two, and the height H of the outer surface rib is larger than the depth D of the outer surface recess. 前記外面リブの高さＨは、前記外面凹部の深さＤより、０．０５〜０．２５ｍｍ大きいものとなっている請求項１に記載の樹脂成形体の射出成形用金型。 The injection molding die for a resin molded product according to claim 1, wherein the height H of the outer surface rib is 0.05 to 0.25 mm larger than the depth D of the outer surface recess. 前記外面リブの高さＨは、０．１５〜０．３５ｍｍであり、前記外面凹部の深さＤは、０．１０〜０．３０ｍｍである請求項２に記載の樹脂成形体の射出成形用金型。 The injection molding of the resin molded product according to claim 2, wherein the height H of the outer surface rib is 0.15 to 0.35 mm, and the depth D of the outer surface recess is 0.10 to 0.30 mm. Mold. 前記傾斜角度βは、前記傾斜角度αより、５〜２５度大きいものとなっている請求項１ないし３のいずれかに記載の樹脂成形体の射出成形用金型。 The injection molding die for a resin molded product according to any one of claims 1 to 3, wherein the inclination angle β is 5 to 25 degrees larger than the inclination angle α. 前記傾斜角度βは、１５〜３５度であり、前記傾斜角度αは、１０〜３０度である請求項４に記載の樹脂成形体の射出成形用金型。 The injection molding die for a resin molded product according to claim 4, wherein the inclination angle β is 15 to 35 degrees, and the inclination angle α is 10 to 30 degrees. 前記外面リブは、前記基端側部分を形成する基端側傾斜部と、湾曲頂部と、前記湾曲頂部と連続し、前記コアの先端方向に延びかつ突出高さが徐々に小さくなる先端部を備えている請求項１ないし５のいずれかに記載の樹脂成形体の射出成形用金型。 The outer surface rib is continuous with the base end side inclined portion forming the base end side portion, the curved top portion, and the curved top portion, and extends toward the tip end direction of the core and the protruding height gradually decreases. The injection molding die for a resin molded product according to any one of claims 1 to 5. 前記外面凹部は、前記先端側部分を形成する先端側傾斜部と、湾曲底部と、前記湾曲底部と連続し、前記コアの基端方向に延びかつ深さが徐々に小さくなる基端部を備えている請求項１ないし６のいずれかに記載の樹脂成形体の射出成形用金型。 The outer surface recess includes a tip-side inclined portion forming the tip-side portion, a curved bottom portion, and a proximal end portion which is continuous with the curved bottom portion and extends in the proximal direction of the core and gradually decreases in depth. The injection molding die for the resin molded product according to any one of claims 1 to 6. 前記外面リブは、環状外面リブであり、前記外面凹部は、環状外面凹部である請求項１ないし７のいずれに記載の樹脂成形体の射出成形用金型。 The injection molding die for a resin molded product according to any one of claims 1 to 7, wherein the outer surface rib is an annular outer surface rib, and the outer surface recess is an annular outer surface recess. 前記外面リブは、前記コアの中心軸に対して直交する同一の円周上領域に設けられた複数の非連続リブであり、前記外面凹部は、前記外面リブと対応するように形成され、かつ、前記コアの中心軸に対して直交する同一の円周上領域に設けられた複数の非連続リブである請求項１ないし７のいずれに記載の樹脂成形体の射出成形用金型。 The outer surface ribs are a plurality of discontinuous ribs provided in the same circumferential region orthogonal to the central axis of the core, and the outer surface recesses are formed so as to correspond to the outer surface ribs. The injection molding die for a resin molded product according to any one of claims 1 to 7, which is a plurality of discontinuous ribs provided in the same circumferential region orthogonal to the central axis of the core. 前記外面リブの前記コアの軸方向長は、前記外面凹部の前記コアの軸方向長と同等もしくは長いものとなっている請求項１ないし９のいずれかに記載の樹脂成形体の射出成形用金型。 The injection molding die for a resin molded product according to any one of claims 1 to 9, wherein the axial length of the core of the outer surface rib is equal to or longer than the axial length of the core of the outer surface recess. Mold. 前記外側金型は、フランジ部を形成するためのフランジ部形成部を備え、前記溶融樹脂注入ゲートは、前記フランジ部形成部の側面に設けられている請求項１ないし１０のいずれかに記載の樹脂成形体の射出成形用金型。 The outer mold comprises a flange portion forming portion for forming a flange portion, and the molten resin injection gate is provided according to any one of claims 1 to 10 provided on a side surface of the flange portion forming portion. Mold for injection molding of resin molded body. 前記筒状の樹脂成形体が、シリンジ用外筒である請求項１ないし１１のいずれかに記載の樹脂成形体の射出成形用金型。 The injection molding mold for a resin molded product according to any one of claims 1 to 11, wherein the tubular resin molded product is an outer cylinder for a syringe. 請求項１ないし１２のいずれかに記載の樹脂成形体の射出成形用金型を用いて射出成形された筒状の樹脂成形体であって、前記樹脂成形体は、前記樹脂成形体の基端部内面に設けられた内面リブと、前記内面リブと近接しかつ前記内面リブより前記樹脂成形体の基端側に位置する内面凹部と、前記内面凹部より前記樹脂成形体の基端側に位置し、前記樹脂成形体の基端に向かって拡径する基端テーパー部とを備えることを特徴とする筒状の樹脂成形体。 A tubular resin molded product that is injection-molded using the injection molding mold of the resin molded product according to any one of claims 1 to 12, wherein the resin molded product is a base end of the resin molded product. An inner surface rib provided on the inner surface of the portion, an inner surface recess that is close to the inner surface rib and located on the base end side of the resin molded body from the inner surface rib, and a position on the base end side of the resin molded body from the inner surface recess. A tubular resin molded body , which comprises a base end tapered portion whose diameter increases toward the base end of the resin molded body. 請求項１ないし１２のいずれかに記載の樹脂成形体の射出成形用金型を用いて射出成形されたシリンジ用外筒であって、前記シリンジ用外筒は、前記シリンジ用外筒の基端部内面に設けられた内面リブと、前記内面リブと近接しかつ前記内面リブより前記シリンジ用外筒の基端側に位置する内面凹部と、前記内面凹部より前記シリンジ用外筒の基端側に位置し、前記シリンジ用外筒の基端に向かって拡径する基端テーパー部とを備えることを特徴とするシリンジ用外筒。An outer cylinder for a syringe formed by injection molding using the injection molding mold of the resin molded product according to any one of claims 1 to 12, wherein the outer cylinder for a syringe is a base end of the outer cylinder for a syringe. An inner surface rib provided on the inner surface of the portion, an inner surface recess close to the inner surface rib and located closer to the base end side of the syringe outer cylinder than the inner surface rib, and a base end side of the syringe outer cylinder from the inner surface recess. An outer cylinder for a syringe, which is located in the above and includes a base end taper portion whose diameter increases toward the base end of the outer cylinder for a syringe.
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JP4594147B2 (en) * 2005-03-29 2010-12-08 テルモ株式会社 Syringe outer cylinder, syringe, injection mold for syringe outer cylinder, and method for manufacturing syringe outer cylinder
JP4818752B2 (en) * 2006-02-24 2011-11-16 テルモ株式会社 Injection molding die for outer cylinder for syringe, manufacturing method for outer cylinder for syringe, outer cylinder for syringe and prefilled syringe
JP6659022B2 (en) * 2015-03-30 2020-03-04 テルモ株式会社 Mold for injection molding of resin moldings

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