JP2018034451A - Manufacturing method of hollow molded article - Google Patents
Manufacturing method of hollow molded article Download PDFInfo
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- JP2018034451A JP2018034451A JP2016170173A JP2016170173A JP2018034451A JP 2018034451 A JP2018034451 A JP 2018034451A JP 2016170173 A JP2016170173 A JP 2016170173A JP 2016170173 A JP2016170173 A JP 2016170173A JP 2018034451 A JP2018034451 A JP 2018034451A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000000465 moulding Methods 0.000 claims abstract description 109
- 239000012530 fluid Substances 0.000 claims abstract description 83
- 229920005989 resin Polymers 0.000 claims abstract description 66
- 239000011347 resin Substances 0.000 claims abstract description 66
- 239000000463 material Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 238000009835 boiling Methods 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 17
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 238000005429 filling process Methods 0.000 abstract description 4
- 239000000047 product Substances 0.000 description 176
- 239000000243 solution Substances 0.000 description 21
- 238000001746 injection moulding Methods 0.000 description 18
- 238000005304 joining Methods 0.000 description 18
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 12
- 239000012768 molten material Substances 0.000 description 11
- 229920006351 engineering plastic Polymers 0.000 description 10
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- 239000011780 sodium chloride Substances 0.000 description 6
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- 230000002787 reinforcement Effects 0.000 description 4
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- 229910052751 metal Inorganic materials 0.000 description 3
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- 150000003839 salts Chemical class 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 239000004740 DURAFIDE® Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 2
- 229930006000 Sucrose Natural products 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
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- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
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- 238000011156 evaluation Methods 0.000 description 1
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- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000003960 organic solvent Substances 0.000 description 1
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- 230000001737 promoting effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
本発明は、中空成形品の製造方法に関する。 The present invention relates to a method for producing a hollow molded article.
中空成形品の製造方法として、射出成形機による製造方法が知られている。射出成形機により中空成形品を製造する場合、まず、１次成形において、中空成形品を二つ割りの半中空成形品あるいは分割体として成形する。続いて、２次成形において、その分割面を突き合わせ、そして突き合わせた部分に、溶融された樹脂（以下、「溶融樹脂」という。）を射出して１個の中空成形品を製造する。 As a method for producing a hollow molded article, a production method using an injection molding machine is known. When a hollow molded product is produced by an injection molding machine, first, in the primary molding, the hollow molded product is molded as a half-hollow molded product or a split body. Subsequently, in the secondary molding, the divided surfaces are abutted, and a molten resin (hereinafter referred to as “molten resin”) is injected into the abutted portion to produce one hollow molded product.
このような射出成形方法の実施に使用される金型は、固定金型とスライド金型とを含んで構成される。１次成形において、まずは、スライド金型を型締めする。続いて、固定金型では、第１の半中空成形品を成形するとともに、スライド金型では、第２の半中空成形品を成形する。そして、第１及び第２の半中空成形品が固化した後に、スライド金型を開き、スライド金型を、スライド金型の成形面が固定金型の成形面に対向するように移動し、第１の半中空成形品と第２の半中空成形品との接合部どうしを突き合わせる。この突き合わせにより、中空部（接合空間部）が形成される。 A mold used for carrying out such an injection molding method includes a fixed mold and a slide mold. In the primary molding, first, the slide mold is clamped. Subsequently, in the stationary mold, the first semi-hollow molded product is molded, and in the slide mold, the second semi-hollow molded product is molded. Then, after the first and second semi-hollow molded products are solidified, the slide mold is opened, and the slide mold is moved so that the molding surface of the slide mold faces the molding surface of the fixed mold, The joints between the first semi-hollow molded product and the second semi-hollow molded product are butted together. By this butting, a hollow portion (joining space portion) is formed.
図５は、第１の半中空成形品１１１の接合部１１１Ａと第２の半中空成形品１１２の接合部１１２Ａとを突き合わせ、中空部（接合空間部）１１３を形成したときの射出成形装置１００の状態を示す模式図である。中空部（接合空間部）１１３を形成した後の２次成形では、一対の半中空成形品１１１、１１２の接合部１１１Ａ、１１２Ａの外周に、溶融樹脂１１４’を射出し、第１の半中空成形品部材１１１と第２の半中空成形品部材１１２とを一体化する。そして、溶融樹脂１１４’が硬化し、２次樹脂の硬化物１１４になった後に成形品を取り出すことで、図６に示す中空成形品１１０が得られる。 FIG. 5 shows an injection molding apparatus 100 when the joining portion 111A of the first semi-hollow molded product 111 and the joining portion 112A of the second semi-hollow molded product 112 are abutted to form a hollow portion (joining space portion) 113. It is a schematic diagram which shows this state. In the secondary molding after forming the hollow portion (joining space portion) 113, molten resin 114 ′ is injected to the outer periphery of the joining portions 111A and 112A of the pair of semi-hollow molded products 111 and 112, and the first semi-hollow The molded product member 111 and the second semi-hollow molded product member 112 are integrated. Then, after the molten resin 114 ′ is cured and becomes a cured product 114 of the secondary resin, the molded product is taken out, whereby the hollow molded product 110 shown in FIG. 6 is obtained.
上記製造方法によると、中空成形品１１０を製造するための各々の工程を自動化でき、中空成形品１１０を低コストで効率よく量産できるという利点がある。また、一対の半中空成形品１１１、１１２が射出成形により成形されるので、中空成形品１１０が複雑な形状であっても量産可能という利点もある。 According to the manufacturing method, each process for manufacturing the hollow molded article 110 can be automated, and there is an advantage that the hollow molded article 110 can be mass-produced efficiently at low cost. Further, since the pair of semi-hollow molded products 111 and 112 are molded by injection molding, there is an advantage that mass production is possible even if the hollow molded product 110 has a complicated shape.
ところで、上記の製造方法では、２次成形において、一対の半中空成形品１１１、１１２の接合部の外周に、溶融樹脂１１４’を射出するにあたり、図７の（Ａ）に示すように、２次成形での射出圧力によって一対の半中空成形品１１１、１１２の形状が変形され得ることが知られている。また、図７の（Ｂ）に示すように、２次成形での射出圧力によって一対の半中空成形品１１１、１１２が破壊し、２次成形で供給される溶融材料１１４’が一対の半中空成形品１１１、１１２の中空部１１３に流れ込んで硬化し、２次樹脂の硬化物１１４になる可能性があることも知られている。 By the way, in the above-described manufacturing method, in the secondary molding, when the molten resin 114 ′ is injected to the outer periphery of the joint portion of the pair of semi-hollow molded products 111 and 112, as shown in FIG. It is known that the shape of the pair of semi-hollow molded products 111 and 112 can be changed by the injection pressure in the next molding. Further, as shown in FIG. 7B, the pair of semi-hollow molded products 111 and 112 are broken by the injection pressure in the secondary molding, and the molten material 114 ′ supplied in the secondary molding is a pair of semi-hollows. It is also known that there is a possibility of flowing into the hollow portion 113 of the molded products 111 and 112 and curing to become a cured product 114 of the secondary resin.
この課題を解決するため、一対の半中空成形品１１１、１１２をリブ補強することや、一対の半中空成形品１１１、１１２を厚肉にすることが考えられる。しかしながら、一対の半中空成形品１１１、１１２のリブ補強、厚肉化のいずれによっても、中空部１１３の容積が小さくなるため、中空部１１３の容積を確保するため、一対の半中空成形品１１１、１１２を大型化しなければならないことが懸念される。 In order to solve this problem, it is conceivable to reinforce the pair of semi-hollow molded products 111 and 112 or to make the pair of semi-hollow molded products 111 and 112 thick. However, the volume of the hollow portion 113 is reduced by rib reinforcement or thickening of the pair of semi-hollow molded products 111 and 112. Therefore, in order to secure the volume of the hollow portion 113, the pair of semi-hollow molded products 111 , 112 must be enlarged.
特許文献１は、２次成形に関し、一方の半中空成形品の底部に設けられた透孔から、突き合わせ後の一対の半中空成形品の中空部に袋状の弾性体を挿入し、この袋状の弾性体の内部に圧縮空気を注入することで、突き合わせた接合部の内周部を加圧流体で膨張させた袋状の弾性体で支持してから、一対の半中空成形品の接合部の外周に、溶融樹脂を射出し、溶融樹脂を冷却固化して中空成形品を得ることを開示する。そして、袋状の弾性体は、シリコンゴム、合成ゴム等からなる。また、２次成形用の溶融樹脂の温度は、例えば２００℃程度である。特許文献１に記載の発明によると、突き合わせた接合部の内周部が、加圧流体で膨張させた袋状の弾性体で支持されているので、２次成形用の射出圧力を大きくしても、接合部分が変形して溶融樹脂が内部へ洩れることがなく、十分な接合強度を得ることができる。また、特許文献１に記載の発明によると、２次成形用の射出圧力を大きくすることができるので、２次成形用の溶融樹脂の流れの流路を長くすることもできる。さらに、特許文献１に記載の発明によると、溶融樹脂が内部へ洩れないので、薄肉の合成樹脂製中空成形品を得ることもできる。 Patent Document 1 relates to secondary molding, and inserts a bag-like elastic body into a hollow portion of a pair of semi-hollow molded products after abutting from a through hole provided at the bottom of one semi-hollow molded product. By injecting compressed air into the inside of the elastic body, the inner peripheral part of the joined part is supported by a bag-like elastic body expanded with a pressurized fluid, and then a pair of semi-hollow molded products are joined Disclosed is to inject a molten resin on the outer periphery of the part and cool and solidify the molten resin to obtain a hollow molded product. The bag-like elastic body is made of silicon rubber, synthetic rubber, or the like. The temperature of the molten resin for secondary molding is, for example, about 200 ° C. According to the invention described in Patent Document 1, since the inner peripheral portion of the joined joint is supported by a bag-like elastic body inflated with a pressurized fluid, the injection pressure for secondary molding is increased. However, the joining portion is not deformed and the molten resin does not leak into the interior, and a sufficient joining strength can be obtained. Further, according to the invention described in Patent Document 1, since the injection pressure for secondary molding can be increased, the flow path of the molten resin flow for secondary molding can also be lengthened. Furthermore, according to the invention described in Patent Document 1, since the molten resin does not leak into the interior, a thin synthetic resin hollow molded product can be obtained.
しかしながら、特許文献１に記載の手法では、溶融樹脂を冷却固化した後、袋状の弾性体から空気を抜き、袋状の弾性体を透孔から取り出すことを要する。そのため、一方の半中空成形品の底部に設けられた透孔の大きさが小さく、突き合わせ後の一対の半中空成形品の中空部の大きさが大きい場合、袋状の弾性体を透孔から取り出すのが困難となり得る。 However, in the technique described in Patent Document 1, it is necessary to cool and solidify the molten resin, and then remove air from the bag-like elastic body and take out the bag-like elastic body from the through holes. Therefore, when the size of the through hole provided at the bottom of one of the semi-hollow molded products is small and the size of the hollow portions of the pair of semi-hollow molded products is large, the bag-like elastic body is removed from the through-hole. It can be difficult to remove.
本発明は、以上のような課題を解決するためになされたものであり、その目的は、薄肉、小型であっても中空部の容積が確保された中空成形品を低コストで効率よく量産することである。 The present invention has been made to solve the above-described problems, and its purpose is to efficiently mass-produce a hollow molded product in which the volume of the hollow portion is secured even though it is thin and small in size. That is.
本発明者らは、上記のような課題を解決するために鋭意研究を重ねた。その結果、一対の半中空成形品の接合部の外周に溶融樹脂を射出する２次成形を行うにあたり、一対の半中空成形品の接合部どうしを突き合わせた後、一対の半中空成形品の中空部に流動体を充填して、一対の半中空成形品の内部から外部にかかる圧力が、一対の半中空成形品の外部から内部にかかる圧力以上である状態で、一対の半中空成形品を一体化することで、上記の課題を解決できることを見出し、本発明の完成に至った。具体的に、本発明は以下のものを提供する。 The inventors of the present invention have made extensive studies in order to solve the above problems. As a result, in performing the secondary molding in which the molten resin is injected to the outer periphery of the joint portion of the pair of semi-hollow molded products, after joining the joint portions of the pair of semi-hollow molded products, The pair of semi-hollow molded products is filled with a fluid in a state where the pressure applied from the inside to the outside of the pair of semi-hollow molded products is equal to or greater than the pressure applied from the outside to the inside of the pair of semi-hollow molded products. As a result of the integration, it was found that the above-mentioned problems can be solved, and the present invention has been completed. Specifically, the present invention provides the following.
（１）本発明は、接合部を有する一対の半中空成形品を成形する１次成形工程と、前記一対の半中空成形品の接合部どうしを突き合わせる突き合わせ工程と、前記突き合わせ工程の前又は後に前記一対の半中空成形品の中空部に流動体を充填する充填工程と、前記充填工程の後、前記一対の半中空成形品の接合部の外周に、溶融樹脂を射出し、前記一対の半中空成形品の内部から外部にかかる圧力が、前記一対の半中空成形品の外部から内部にかかる圧力以上である状態で、前記一対の半中空成形品を一体化し、中空成形品を得る２次成形工程と、前記中空成形品の中空部から前記流動体を排出する流動体排出工程とを含み、前記充填工程で充填する流動体の沸点は、前記２次成形工程で射出する材料の温度よりも高い、中空成形品の製造方法である。 (1) The present invention relates to a primary molding step of molding a pair of semi-hollow molded products having joints, a butting step of butting the joints of the pair of semi-hollow molded products, and before or A filling step of filling the hollow portions of the pair of semi-hollow molded products later with a fluid, and after the filling step, a molten resin is injected into the outer periphery of the joint portion of the pair of semi-hollow molded products; In the state where the pressure applied from the inside to the outside of the semi-hollow molded product is equal to or higher than the pressure applied from the outside to the inside of the pair of semi-hollow molded products, the pair of semi-hollow molded products are integrated to obtain a hollow molded product 2 The boiling point of the fluid that is filled in the filling step includes the temperature of the material injected in the secondary molding step, including a secondary molding step and a fluid discharge step of discharging the fluid from the hollow portion of the hollow molded product Higher than hollow mold manufacturing method It is.
（２）また、本発明は、前記一対の半中空成形品の少なくとも一方には、穴が形成されており、前記充填工程の後、前記穴を塞ぐ部材を前記穴に挿入し、前記一対の半中空成形品の外部から前記穴を塞ぐ部材に向けて力を加えることで、前記一対の半中空成形品の内部から外部にかかる圧力を大きくする内圧上昇工程をさらに含み、前記２次成形工程は、前記内圧上昇工程によって、前記一対の半中空成形品の内部から外部にかかる圧力が、前記一対の半中空成形品の外部から内部にかかる圧力以上にされた状態で、前記一対の半中空成形品の接合部の外周に、溶融樹脂を射出する工程であり、前記流動体排出工程は、前記穴を塞ぐ部材を前記穴から外し、前記流動体を前記穴から排出する工程である、（１）に記載の中空成形品の製造方法である。 (2) Further, according to the present invention, a hole is formed in at least one of the pair of semi-hollow molded products, and after the filling step, a member that closes the hole is inserted into the hole, The secondary molding step further includes an internal pressure increasing step of increasing the pressure applied from the inside to the outside of the pair of semi-hollow molded products by applying a force from the outside of the semi-hollow molded product to the member that closes the hole. In the state where the pressure applied from the inside to the outside of the pair of semi-hollow molded products is equal to or higher than the pressure applied from the outside to the inside of the pair of semi-hollow molded products by the internal pressure increasing step. A step of injecting a molten resin to the outer periphery of the joint portion of the molded product, and the fluid discharge step is a step of removing a member closing the hole from the hole and discharging the fluid from the hole. Method for producing hollow molded article according to 1) A.
（３）また、本発明は、前記１次成形工程は、固定金型とスライド金型とにより形成されているキャビティに、溶融樹脂を射出し、前記固定金型の成形面上に、一方の半中空成形品を、接合部を有するように成形するとともに、前記スライド金型の成形面上に、他方の半中空成形品を、接合部と前記穴とを有するように成形する工程であり、前記突き合わせ工程は、前記スライド金型を、前記スライド金型の成形面が前記固定金型の成形面に対向するように移動させて、前記一対の半中空成形品の接合部どうしを突き合わせる工程であり、前記内圧上昇工程は、前記穴を塞ぐ部材を前記穴に挿入した後、前記スライド金型を型締めすることで、前記一対の半中空成形品の内部から外部にかかる圧力を大きくする工程である、（２）に記載の中空成形品の製造方法である。 (3) Further, according to the present invention, in the primary molding step, molten resin is injected into a cavity formed by a fixed mold and a slide mold, and one of the molds is formed on the molding surface of the fixed mold. The step of molding the semi-hollow molded product so as to have a joint, and molding the other semi-hollow molded product on the molding surface of the slide mold so as to have the joint and the hole, The abutting step is a step of abutting the joint portions of the pair of semi-hollow molded articles by moving the slide mold so that the molding surface of the slide mold faces the molding surface of the fixed mold. The internal pressure increasing step increases the pressure applied from the inside to the outside of the pair of semi-hollow molded products by inserting a member for closing the hole into the hole and then clamping the slide mold. The process described in (2) It is a manufacturing method of a molded article.
（４）また、本発明は、前記一対の半中空成形品の少なくとも一方には、穴が形成されており、前記２次成形工程は、前記穴を塞ぐ部材を前記穴に挿入することと、前記一対の半中空成形品の接合部の外周に、溶融樹脂を射出することと、前記溶融樹脂を前記接合部の外周に射出する射出圧力を、前記穴を塞ぐ部材に加えることとを含む、（１）に記載の中空成形品の製造方法である。 (4) In the present invention, a hole is formed in at least one of the pair of semi-hollow molded products, and the secondary molding step includes inserting a member for closing the hole into the hole, Injecting molten resin to the outer periphery of the joint part of the pair of semi-hollow molded products, and applying an injection pressure for injecting the molten resin to the outer periphery of the joint part to the member that closes the hole, It is a manufacturing method of the hollow molded article as described in (1).
（５）また、本発明は、前記流動体が粉体であり、前記充填工程で充填する前記粉体の融点が、前記２次成形工程で射出する材料の温度よりも高い、（１）から（４）のいずれかに記載の中空成形品の製造方法である。 (5) Further, in the invention, the fluid is a powder, and the melting point of the powder filled in the filling step is higher than the temperature of the material injected in the secondary molding step. (4) A method for producing a hollow molded article according to any one of (4).
（６）また、本発明は、前記粉体が水溶性であり、前記粉体排出工程は、前記中空成形品の中空部に水溶液を供給し、前記粉体を前記水溶液で溶かす工程を含む、（５）に記載の中空成形品の製造方法である。 (6) Further, in the present invention, the powder is water-soluble, and the powder discharging step includes a step of supplying an aqueous solution to a hollow portion of the hollow molded article and dissolving the powder with the aqueous solution. It is a manufacturing method of the hollow molded article as described in (5).
本発明によると、薄肉、小型であっても中空部の容積が確保された中空成形品を低コストで効率よく量産することができる。 According to the present invention, a hollow molded product in which the volume of the hollow portion is ensured even if it is thin and small can be mass-produced efficiently at low cost.
以下、本発明の実施形態について詳細に説明するが、本発明は、以下の実施形態に何ら限定されるものではなく、本発明の目的の範囲内において、適宜変更を加えて実施することができる。なお、説明が重複する箇所については、適宜説明を省略する場合があるが、発明の要旨を限定するものではない。 Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and can be implemented with appropriate modifications within the scope of the object of the present invention. . In addition, although description may be abbreviate | omitted suitably about the location where description overlaps, the summary of invention is not limited.
＜樹脂複合成形体の製造方法＞
〔第１の実施形態〕
まず、本発明の第１の実施形態について説明する。本実施形態の製造方法は、（Ａ）接合部を有する一対の半中空成形品を成形する１次成形工程と、（Ｂ）一対の半中空成形品の接合部どうしを突き合わせる突き合わせ工程と、（Ｃ）突き合わせ工程の前又は後に、一対の半中空成形品の中空部に流動体を充填する充填工程と、（Ｄ）充填工程の後、一対の半中空成形品の接合部の外周に、溶融樹脂を射出し、一対の半中空成形品の内部から外部にかかる圧力が、一対の半中空成形品の外部から内部にかかる圧力以上である状態で、前記一対の半中空成形品を一体化し、中空成形品を得る２次成形工程と、（Ｅ）中空成形品の中空部から流動体を排出する流動体排出工程とを含む。
<Method for producing resin composite molded body>
[First Embodiment]
First, a first embodiment of the present invention will be described. The manufacturing method of the present embodiment includes (A) a primary forming step of forming a pair of semi-hollow molded products having joint portions, and (B) a butting step of matching the joint portions of the pair of semi-hollow molded products, (C) Before or after the butting step, a filling step of filling the fluid into the hollow portions of the pair of semi-hollow molded products, and (D) after the filling step, on the outer periphery of the joint portion of the pair of semi-hollow molded products, The molten resin is injected, and the pair of semi-hollow molded products are integrated in a state where the pressure applied from the inside to the outside of the pair of semi-hollow molded products is equal to or higher than the pressure applied from the outside to the inside of the pair of semi-hollow molded products. A secondary molding step of obtaining a hollow molded product, and (E) a fluid discharge step of discharging the fluid from the hollow portion of the hollow molded product.
［（Ａ）１次成形工程］
１次成形工程では、１次成形用金型を用いて、２以上の分割部分に分割され、その各々に接合部を有する半中空成形品を成形する。
[(A) Primary molding step]
In the primary molding step, a semi-hollow molded product that is divided into two or more divided parts and has a joint portion in each of them is molded using a primary molding die.
ここで、半中空成形品の材料は、射出成形が可能な材料であれば特に限定されるものでなく、樹脂材料、ゴム、接着剤、金属等のいずれであってもよい。このうち、樹脂材料としては、熱可塑性樹脂、硬化性樹脂（熱硬化性樹脂、光硬化性樹脂、放射線硬化性樹脂等）のいずれであってもよい。樹脂材料として好適な材質としては、例えば、ポリフェニレンスルフィド（ＰＰＳ）、液晶ポリマー（ＬＣＰ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリアセタール（ＰＯＭ）等が挙げられる。 Here, the material of the semi-hollow molded product is not particularly limited as long as it is a material capable of injection molding, and may be any of resin material, rubber, adhesive, metal, and the like. Among these, the resin material may be any of a thermoplastic resin and a curable resin (such as a thermosetting resin, a photocurable resin, and a radiation curable resin). Examples of suitable materials for the resin material include polyphenylene sulfide (PPS), liquid crystal polymer (LCP), polybutylene terephthalate (PBT), and polyacetal (POM).
材料を半中空成形品に成形する方法としては、ＤＳＩ（ダイスライドインジェクション）法、ＤＲＩ（ダイロータリーインジェクション）法のように２次成形用金型と兼用の金型で射出成形する方法や、予め用意した部品と複合成形するインサート成形する方法等が挙げられるが、これらに限定されるものではなく、半中空成形品を別々の金型で成形して、それらを組み合わせて用いることもできる。 As a method of molding the material into a semi-hollow molded product, a method of injection molding using a mold that is also used as a secondary molding die, such as a DSI (die slide injection) method or a DRI (die rotary injection) method, Examples of the method include insert molding for composite molding with the prepared part, but the present invention is not limited to these methods, and semi-hollow molded products can be molded with separate dies and used in combination.
具体的態様として、１次成形工程は、固定金型とスライド金型とにより形成されているキャビティに、溶融樹脂を射出し、固定金型の成形面上に、一方の半中空成形品を、接合部を有するように成形するとともに、スライド金型の成形面上に、他方の半中空成形品を、接合部と開口（穴）とを有するように成形することが挙げられる。 As a specific aspect, in the primary molding step, molten resin is injected into a cavity formed by a fixed mold and a slide mold, and one semi-hollow molded product is formed on the molding surface of the fixed mold. It is possible to form the other semi-hollow molded product so as to have a joint portion and an opening (hole) on the molding surface of the slide mold while molding so as to have the joint portion.
１次成形される半中空成形品は、接合部を有しており、一対の分割部分に各々設けられている接合部どうしを接触させたときに、中空となる形状を有する。ここで、半中空成形品の接合部の形状には特に制限はなく、例えば突き合わせ部分が互いに嵌まり合うような形状にしてもよい。また、半中空成形品は必ずしも一対、すなわち二つのみの分割部分としたものに限定される訳ではなく、三つ以上の分割部分の接合部を接触させて、中空となる形状を有するようにしてもよい。 The semi-hollow molded product that is primarily formed has a joint, and has a shape that becomes hollow when the joints provided in the pair of divided parts are brought into contact with each other. Here, there is no restriction | limiting in particular in the shape of the junction part of a semi-hollow molded product, For example, you may make it a shape which a butt | matching part fits mutually. Moreover, the semi-hollow molded product is not necessarily limited to a pair, that is, only two divided parts, but has a shape that is hollow by bringing the joints of three or more divided parts into contact with each other. May be.
半中空成形品について、リブ補強の有無は、特に限定されない。また、半中空成形品は、必ずしも厚肉である必要はなく、薄肉であってもよい。具体的に、半中空成形品の肉厚は、０．５ｍｍ以上８ｍｍ以下であってもよいし、１ｍｍ以上５ｍｍ以下であってもよい。 The presence or absence of rib reinforcement for the semi-hollow molded product is not particularly limited. Moreover, the semi-hollow molded product does not necessarily need to be thick, and may be thin. Specifically, the thickness of the semi-hollow molded product may be 0.5 mm or more and 8 mm or less, or 1 mm or more and 5 mm or less.
射出成形機を用いて中空成形品を製造する際、これまでであれば、２次成形において、一対の半中空成形品の接合部の外周に、溶融樹脂を射出するにあたり、２次成形での射出圧力によって一対の半中空成形品の形状が変形されたり、２次成形での射出圧力によって一対の半中空成形品が破壊することに起因して、２次成形で供給される溶融材料が一対の半中空成形品の中空部１１３に流れ込んだりすることがあった。これらを解消するため、これまでであれば、一対の半中空成形品をリブ補強することや、一対の半中空成形品を厚肉にすること等の対策を要した。 When producing a hollow molded product using an injection molding machine, if it has been so far, in secondary molding, when injecting molten resin to the outer periphery of the joint part of a pair of semi-hollow molded products, Due to the deformation of the pair of semi-hollow molded products due to the injection pressure or the destruction of the pair of semi-hollow molded products due to the injection pressure in the secondary molding, a pair of molten materials supplied in the secondary molding Sometimes flow into the hollow portion 113 of the semi-hollow molded product. In order to solve these problems, it has been necessary to take measures such as reinforcing the ribs of the pair of semi-hollow molded products and making the pair of semi-hollow molded products thick.
しかしながら、本実施形態に記載の発明では、半中空成形品のリブ補強や、半中空成形品の厚肉化等の対策を要することなく、中空成形品を量産できるため、リブ補強の有無は、特に限定されないし、半中空成形品が薄肉であってもよい。 However, in the invention described in the present embodiment, since the hollow molded product can be mass-produced without requiring measures such as rib reinforcement of the semi-hollow molded product or thickening of the semi-hollow molded product, There is no particular limitation, and the semi-hollow molded product may be thin.
［（Ｂ）突き合わせ工程］
突き合わせ工程では、成形された半中空成形品の一対の分割部分について、接合部どうしを突き合わせる。具体的態様として、スライド金型を、スライド金型の成形面が固定金型の成形面に対向するように移動させて、一対の半中空成形品の接合部どうしを突き合わせることが挙げられる。これにより、半中空成形品が接合部において接触することで、中空部を有する組立体が形成される。
[(B) Matching step]
In the butting step, the joints are butted against a pair of divided portions of the molded semi-hollow molded product. As a specific embodiment, the slide mold is moved so that the molding surface of the slide mold faces the molding surface of the fixed mold, and the joint portions of the pair of semi-hollow molded products are brought into contact with each other. Thereby, the assembly which has a hollow part is formed because a semi-hollow molded product contacts in a junction part.
図１は、第１の半中空成形品３１の接合部３１Ａと第２の半中空成形品３２の接合部３２Ａとを突き合わせ、中空部（接合空間部）３３を形成したときの射出成形装置１０の状態を示す模式図である。 FIG. 1 shows an injection molding apparatus 10 when a joining portion 31A of a first semi-hollow molded product 31 and a joining portion 32A of a second semi-hollow molded product 32 are abutted to form a hollow portion (joining space portion) 33. It is a schematic diagram which shows this state.
半中空成形品３１、３２の接合部３１Ａ、３２Ａどうしを突き合わせた組立体には、流動体４１を導入及び導出させる開口３４が設けられる。本実施形態は、開口３４の大きさに関わらず、薄肉、小型であっても中空部３３の容積が確保された中空成形品を、低コストで効率よく量産できることを特徴とする。その点で、開口３４の大きさは、特に限定されるものでなく、中空部３３の形状や容積に応じて適宜設定すればよい。開口３４が大きければ、後述する流動体４１の排出が容易となるが、中空成形品３１の中空部３３を気密状態に保つ必要がある用途に用いる場合には、最終的に開口３４を封止する必要があるため、開口３４を小さくしておく方が好ましい。開口３４の断面積は、２００ｍｍ２以下であってもよいし、１００ｍｍ２以下であってもよい。また、中空部３３の形状も特に限定されるものでなく、棒状であってもよく、柱状であってもよい。そして、中空部３３の容積も特に限定されるものでなく、５０００ｍｍ３以上であってもよいし、１００００ｍｍ３以上であってもよい。 An opening 34 through which the fluid 41 is introduced and led out is provided in the assembly in which the joint portions 31A and 32A of the semi-hollow molded articles 31 and 32 are abutted with each other. The present embodiment is characterized in that, regardless of the size of the opening 34, a hollow molded product in which the volume of the hollow portion 33 is secured even if it is thin and small can be efficiently mass-produced at low cost. In that respect, the size of the opening 34 is not particularly limited, and may be set as appropriate according to the shape and volume of the hollow portion 33. If the opening 34 is large, the fluid 41 described later can be easily discharged. However, when the opening 34 is used for an application where the hollow portion 33 of the hollow molded article 31 needs to be kept airtight, the opening 34 is finally sealed. Therefore, it is preferable to keep the opening 34 small. The cross-sectional area of the opening 34 may be 200 mm 2 or less, or 100 mm 2 or less. Further, the shape of the hollow portion 33 is not particularly limited, and may be a rod shape or a column shape. Then, the volume of the hollow portion 33 is also not particularly limited, and may also be 5000 mm 3 or more, may be 10000 mm 3 or more.
また、中空部３３の容積（単位：ｍｍ３）の開口３４の断面積（単位：ｍｍ２）に対する比（中空部３３の容積／開口３４の断面積、単位：ｍｍ）も特に限定されるものでなく、２０以上であってもよいし、１００以上（たとえば５００以上）であってもよい。 Further, the ratio of the volume (unit: mm 3 ) of the hollow portion 33 to the cross-sectional area (unit: mm 2 ) of the opening 34 (volume of the hollow portion 33 / cross-sectional area of the opening 34, unit: mm) is also particularly limited. Instead, it may be 20 or more, or 100 or more (for example, 500 or more).
［（Ｃ）充填工程］
充填工程は、突き合わせ工程の前又は後に、一対の半中空成形品３１、３２からなる組立体の中空部３３に、流動体４１を充填する工程である。
[(C) Filling step]
The filling step is a step of filling the fluid 41 into the hollow portion 33 of the assembly composed of the pair of semi-hollow molded products 31 and 32 before or after the matching step.
充填工程のタイミングは、突き合わせ工程の前であってもよいし、突き合わせ工程の後であってもよい。突き合わせ工程の前である場合、十分な量の流動体の中へ半中空体成形品を沈めて、半中空体成形品の中空部３３に流動体４１が充満した状態で突き合わせ工程を行うことが挙げられる。突き合わせ工程の後である場合、突き合わせ工程によって得られる一対の半中空成形品３１、３２からなる組立体の中空部３３に、流動体４１を充填することが挙げられる。 The timing of the filling process may be before the matching process or after the matching process. If it is before the butting step, the semi-hollow molded product is submerged in a sufficient amount of fluid, and the butting step is performed with the fluid 41 filled in the hollow portion 33 of the semi-hollow molded product. Can be mentioned. When it is after the butting step, filling the fluid 41 in the hollow portion 33 of the assembly composed of the pair of semi-hollow molded articles 31 and 32 obtained by the butting step may be mentioned.
流動体４１は、後の（Ｄ）２次成形工程で射出する溶融材料３５’の温度よりも高い沸点を有する流動性の材料であれば、特に限定されず、粉体、ゲル、液体のいずれであってもよい。常温で流動性を示していても、（Ｄ）２次成形工程で射出する溶融材料３５’の温度よりも沸点が低い材料であると、（Ｄ）２次成形工程で供給される溶融材料３５’の熱が中空部３３の内部に伝わり、その熱によって流動体が気化する。そうすると、流動体が一対の半中空成形品３１、３２からなる組立体の隙間から漏れ、一対の半中空成形品３１、３２の内部から外部にかかる圧力を、一対の半中空成形品３１、３２の外部から内部にかかる圧力以上の状態に維持できない可能性がある。そのため、常温で流動性を示していても、（Ｄ）２次成形工程で射出する溶融材料３５’の温度よりも沸点が低い材料を流動体４１にすることは、好ましくない。 The fluid 41 is not particularly limited as long as it is a fluid material having a boiling point higher than the temperature of the molten material 35 ′ injected in the subsequent (D) secondary molding step, and any of powder, gel, and liquid can be used. It may be. Even if fluidity is exhibited at room temperature, (D) the molten material 35 supplied in the secondary molding step is (D) a material having a boiling point lower than the temperature of the molten material 35 ′ injected in the secondary molding step. The heat of 'is transmitted to the inside of the hollow portion 33, and the fluid is vaporized by the heat. Then, the fluid leaks from the gap between the assembly composed of the pair of semi-hollow molded products 31, 32, and the pressure applied from the inside to the outside of the pair of semi-hollow molded products 31, 32 is applied to the pair of semi-hollow molded products 31, 32. It may not be possible to maintain a pressure higher than the pressure applied from the outside to the inside. Therefore, even if fluidity is exhibited at room temperature, it is not preferable that the fluid 41 is made of a material having a boiling point lower than the temperature of the molten material 35 ′ injected in the (D) secondary molding step.
中でも、流動体４１が粉体であり、粉体の融点は、（Ｄ）２次成形工程で射出する溶融材料３５’の温度よりも高いことが好ましい。（Ｄ）２次成形工程での溶融材料３５’の射出温度において固体である粉体を中空部３３に充填することで、後述する（Ｄ）２次成形工程において、組立体の中空部３３の内部から外部にかかる圧力を、外部から内部にかかる圧力より大きくしたときにも、組立体の接合部の隙間からの流動体４１の漏出を低減できるため、（Ｄ）２次成形工程で射出する溶融材料３５’（２次材料）への汚染を低減できる。また、特に、エンジニアリング・プラスチックやスーパーエンジニアリング・プラスチックのように、高温の材料で２次成形を行う場合であっても、液体やゲルを充填させた場合と比べて、充填された材料の沸騰や熱膨張に起因した、成形品や金型の破損を防ぐことができる。 Among them, the fluid 41 is preferably a powder, and the melting point of the powder is preferably higher than the temperature of the molten material 35 ′ injected in the (D) secondary molding step. (D) By filling the hollow portion 33 with a powder that is solid at the injection temperature of the molten material 35 ′ in the secondary molding step, (D) in the secondary molding step described later, Even when the pressure applied from the inside to the outside is made larger than the pressure applied from the outside to the inside, leakage of the fluid 41 from the gap in the joint portion of the assembly can be reduced, and therefore (D) injection is performed in the secondary molding step. Contamination to the molten material 35 ′ (secondary material) can be reduced. In particular, even when secondary molding is performed with high-temperature materials, such as engineering plastics and super engineering plastics, compared to the case where liquids or gels are filled, It is possible to prevent damage to the molded product and the mold due to thermal expansion.
中空部３３に充填する流動体４１の具体例としては、砂糖（スクロース）、塩化ナトリウム、砂、消石灰、金属粉、水溶性樹脂（たとえばポリビニルアルコールなど）からなる粉末等が挙げられる。その中でも、流動体４１は、溶液に対して可溶性であることが好ましく、水溶性であることがさらに好ましい。このような流動体４１を用いることにより、後述する（Ｅ）流動体排出工程において、流動体４１を溶かすことの可能な溶液を中空部３３に供給し、溶液に接した後の流動体４１を溶液が溶解又は分散するため、流動体４１を中空部３３から効率的に排出でき、かつ、中空部３３を溶液で洗浄できる。そのため、中空成形体への流動体４１の残留を効率的に低減でき、中空成形体を水回り部材等にも好適に用いることができる。特に、水溶性の流動体４１を用いることで、溶液として水を用いることができ、溶液にかかるコストが低減されるため、中空成形品の製造コストの面で有利である。 Specific examples of the fluid 41 that fills the hollow portion 33 include sugar (sucrose), sodium chloride, sand, slaked lime, metal powder, and a powder made of a water-soluble resin (for example, polyvinyl alcohol). Among them, the fluid 41 is preferably soluble in the solution, and more preferably water-soluble. By using such a fluid 41, a solution capable of dissolving the fluid 41 is supplied to the hollow portion 33 in the fluid discharge step (E) described later, and the fluid 41 after contacting the solution is supplied. Since the solution is dissolved or dispersed, the fluid 41 can be efficiently discharged from the hollow portion 33, and the hollow portion 33 can be washed with the solution. Therefore, the residue of the fluid 41 in the hollow molded body can be efficiently reduced, and the hollow molded body can be suitably used for a water-circulating member or the like. In particular, by using the water-soluble fluid 41, water can be used as the solution, and the cost for the solution is reduced, which is advantageous in terms of the manufacturing cost of the hollow molded product.
ここで、水溶性の流動体４１としては、流動体を中空部からの排出をより促進できる観点から、２０℃の水に対する溶解度が０．１［ｇ／１００ｇ−Ｈ２Ｏ］以上のものが好ましく、１［ｇ／１００ｇ−Ｈ２Ｏ］以上のものがより好ましく、１０［ｇ／１００ｇ−Ｈ２Ｏ］以上のものがさらに好ましく、３０［ｇ／１００ｇ−Ｈ２Ｏ］以上のものがさらに好ましい。また、水溶性の流動体としては、必要に応じて酸やアルカリ等を含んだ水溶液と反応して、水溶性の物質（金属イオン等）を形成し、又は均一な水分散液を形成することで、可溶性を呈するものを用いてもよい。 Here, the fluid 41 of the water-soluble, the fluid from the viewpoint of further promoting the discharge from the hollow portion, the solubility 20 ° C. water 0.1 [g / 100g-H 2 O] or more of Preferably, 1 [g / 100 g-H 2 O] or more is more preferable, 10 [g / 100 g-H 2 O] or more is more preferable, and 30 [g / 100 g-H 2 O] or more is more preferable. Further preferred. Moreover, as a water-soluble fluid, it reacts with an aqueous solution containing acid, alkali, etc. as necessary to form a water-soluble substance (metal ion, etc.) or to form a uniform aqueous dispersion. And what exhibits solubility may be used.
沸点、融点、水への溶解性を考慮すると、流動体４１は、砂糖（スクロース）、塩化ナトリウムであることが好ましく、塩化ナトリウムであることがより好ましい。 Considering the boiling point, melting point, and solubility in water, the fluid 41 is preferably sugar (sucrose) or sodium chloride, more preferably sodium chloride.
［（Ｄ）２次成形工程］
２次成形工程は、（Ｃ）充填工程の後、一対の半中空成形品３１、３２の接合部３１Ａ、３２Ａの外周に、溶融樹脂３５’を射出し、一対の半中空成形品３１、３２を一体化し、中空成形品３０を得る工程である。その際、一対の半中空成形品３１、３２の内部から外部にかかる圧力は、一対の半中空成形品３１、３２の外部から内部にかかる圧力以上である。
[(D) Secondary molding step]
In the secondary molding step, after the filling step (C), the molten resin 35 ′ is injected to the outer periphery of the joint portions 31 </ b> A and 32 </ b> A of the pair of semi-hollow molded products 31 and 32, and the pair of semi-hollow molded products 31 and 32. Is a process of obtaining a hollow molded product 30. At this time, the pressure applied from the inside to the outside of the pair of semi-hollow molded products 31 and 32 is equal to or higher than the pressure applied from the outside to the inside of the pair of semi-hollow molded products 31 and 32.
２次成形工程において射出する溶融樹脂３５’の種類は、特に限定されず、エンジニアリング・プラスチックであってもよいし、スーパーエンジニアリング・プラスチックであってもよい。 The type of the molten resin 35 ′ injected in the secondary molding process is not particularly limited, and may be engineering plastic or super engineering plastic.
樹脂材料としてエンジニアリング・プラスチックやスーパーエンジニアリング・プラスチックを用いる場合、成形温度をより高温にする必要があり、半中空成形品を介して流動体の温度も上昇するため、流動体としてより高い温度でも流動性を示さない材料を用いることが求められる。そのため、特に樹脂材料としてエンジニアリング・プラスチックを用いる場合は、流動体として１００℃で流動性を示さない材料を用いることが好ましく、１２０℃で流動性を示さない材料を用いることがより好ましい。また、樹脂材料としてスーパーエンジニアリング・プラスチックを用いる場合は、流動体として１５０℃で流動性を示さない材料を用いることが好ましく、１６０℃で流動性を示さない材料を用いることがより好ましい。他方で、樹脂材料としてエンジニアリング・プラスチックやスーパーエンジニアリング・プラスチックに該当しない材料を用いる場合は、より低い温度で流動性を示す材料を用いてもよい。 When engineering plastics or super engineering plastics are used as the resin material, the molding temperature needs to be higher, and the temperature of the fluid rises through the semi-hollow molded product. It is required to use a material that does not exhibit properties. Therefore, in particular, when engineering plastic is used as the resin material, it is preferable to use a material that does not exhibit fluidity at 100 ° C., and more preferably a material that does not exhibit fluidity at 120 ° C. as the fluid. Further, when super engineering plastic is used as the resin material, it is preferable to use a material that does not exhibit fluidity at 150 ° C., and more preferably a material that does not exhibit fluidity at 160 ° C. as the fluid. On the other hand, when a material not corresponding to engineering plastic or super engineering plastic is used as the resin material, a material exhibiting fluidity at a lower temperature may be used.
２次成形工程において射出する樹脂の融点は、１次成形工程で用いられる材料の融点よりも低いことが好ましい。このとき、２次成形工程で射出する材料の成形温度を、１次成形工程で用いられる材料の融点よりも低く設定できる場合が多いため、１次成形工程で用いられる材料の変形を抑えられる。ただし、２次成形工程において射出する樹脂の融点が、１次成形工程で用いられる材料の融点より同じか、それより高い場合であっても、２次成形工程で射出する材料の成形温度が、一対の半中空成形品３１、３２を著しく溶融変形させるほど高いものでなければ、これを利用することができる。特に、１次成形工程で用いられる材料と、２次成形工程で射出する材料が相溶性のあるものならば、２次成形工程で射出する材料の成形温度が高い場合、一対の半中空成形品３１、３２の表面が溶融し、２次成形工程で射出する材料と相溶化することで、半中空成形品３１、３２をより強固に一体化させることができる。なお、半中空成形品３１、３２の接合部３１Ａ、３２Ａの表面に溝を設けておくことで、半中空成形品３１、３２、及び２次成形工程における溶融樹脂３５’が、異なる材料の組み合わせであるような場合においても、強固に一体化させやすくなる。上記の溝は、１次成形工程で使用する金型にあらかじめ凹凸を彫っておくことで、接合部３１Ａ、３２Ａに溝を有する半中空成形品３１、３２を成形することで設けてもよく、半中空成形品３１、３２を切削加工することで設けてもよく、半中空成形品３１、３２にレーザー光などを照射することで、接合部３１Ａ、３２Ａの表層の材料を一部除去することで設けてもよい。特に、繊維状強化材を含有する樹脂からなる半中空成形品３１、３２に対し、レーザー光を照射して樹脂成分を一部除去することにより、内側に繊維状強化材が露出した溝を設ける場合、２次成形工程において、溝の内側に露出した繊維状強化材が、溶融樹脂３５’の内部に埋め込まれるような状態で、溶融樹脂３５’が充填されるため、より強固に一体化された中空成形品を得ることが可能となる。 The melting point of the resin injected in the secondary molding step is preferably lower than the melting point of the material used in the primary molding step. At this time, since the molding temperature of the material injected in the secondary molding process can often be set lower than the melting point of the material used in the primary molding process, deformation of the material used in the primary molding process can be suppressed. However, even if the melting point of the resin injected in the secondary molding step is the same as or higher than the melting point of the material used in the primary molding step, the molding temperature of the material injected in the secondary molding step is If the pair of semi-hollow molded articles 31 and 32 are not so high as to cause significant melt deformation, this can be used. In particular, if the material used in the primary molding process and the material injected in the secondary molding process are compatible, if the molding temperature of the material injected in the secondary molding process is high, a pair of semi-hollow molded products When the surfaces of 31 and 32 are melted and are compatible with the material to be injected in the secondary molding process, the semi-hollow molded products 31 and 32 can be more firmly integrated. In addition, by providing grooves on the surfaces of the joint portions 31A and 32A of the semi-hollow molded products 31 and 32, the semi-hollow molded products 31 and 32 and the molten resin 35 ′ in the secondary molding process are a combination of different materials. Even in such a case, it becomes easy to firmly integrate. The grooves may be provided by molding the semi-hollow molded products 31 and 32 having grooves in the joint portions 31A and 32A by previously carving irregularities in the mold used in the primary molding step, The semi-hollow molded products 31 and 32 may be provided by cutting, and by partially irradiating the semi-hollow molded products 31 and 32 with laser light or the like, part of the surface layer material of the joint portions 31A and 32A is removed. May be provided. In particular, the semi-hollow molded articles 31 and 32 made of a resin containing a fibrous reinforcing material are irradiated with laser light to partially remove the resin component, thereby providing a groove in which the fibrous reinforcing material is exposed inside. In this case, in the secondary molding step, the fibrous reinforcing material exposed inside the groove is filled with the molten resin 35 ′ in a state where the fibrous reinforcing material is embedded in the molten resin 35 ′. A hollow molded product can be obtained.
２次成形工程における溶融樹脂３５’の射出は、一対の半中空成形品３１、３２からなる組立体の内部から外部にかかる圧力が、組立体の外部から内部にかかる圧力以上となる状態で行う。これにより、溶融樹脂３５’の射出による圧力によっても流動体が変形し難くなるため、ひいては組立体の変形が抑制され、中空部において所望の容積が確保された中空成形品を作製することができる。 Injection of molten resin 35 'in the secondary molding step is performed in a state where the pressure applied from the inside to the outside of the assembly composed of the pair of semi-hollow molded products 31 and 32 is equal to or higher than the pressure applied from the outside to the inside of the assembly. . As a result, the fluid is hardly deformed even by the pressure due to the injection of the molten resin 35 ′, and as a result, the deformation of the assembly is suppressed, and a hollow molded product in which a desired volume is secured in the hollow portion can be manufactured. .
組立体の内部から外部にかかる圧力を、組立体の外部から内部にかかる圧力以上に高める手段として、本実施形態では、（Ｃ）充填工程の後、開口３４を塞ぐ部材４２を開口３４に挿入し、一対の半中空成形品３１、３２の外部から開口３４を塞ぐ部材４２に向けて力を加えることで、一対の半中空成形品３１、３２の内部から外部にかかる圧力を大きくする内圧上昇工程を行うものとしてもよい。なお、ここでいう組立体の内部から外部にかかる圧力とは、上記の内圧上昇工程によって付加的に生じる内圧のみを指す訳ではなく、半中空成形品３１、３２が、外力として溶融樹脂３５’の射出による圧力を受けた際に、半中空成形品３１、３２自体の剛性により生じる反発力、及び／又は組立体内部に充填された流動体４１自体から生じる反発力も含むものである。したがって、半中空成形品３１、３２自体、及び／又は流動体４１自体が高い強度を持つ場合や、流動体４１を高密度で充填している場合などのように、上記の反発力が高く、それのみで溶融樹脂３５’の射出による圧力に十分耐え得る場合には、上記の内圧上昇工程は行う必要はない。 As means for increasing the pressure applied from the inside of the assembly to the outside to be higher than the pressure applied from the outside of the assembly to the inside, in this embodiment, after the filling step (C), a member 42 that closes the opening 34 is inserted into the opening 34. Then, by applying a force from the outside of the pair of semi-hollow molded products 31 and 32 toward the member 42 that closes the opening 34, the internal pressure increases to increase the pressure applied from the inside to the outside of the pair of semi-hollow molded products 31 and 32. It is good also as what performs a process. Here, the pressure applied from the inside of the assembly to the outside does not mean only the internal pressure additionally generated by the above-described internal pressure increasing step, but the semi-hollow molded products 31 and 32 are melted resin 35 ′ as an external force. The repulsive force generated by the rigidity of the semi-hollow molded articles 31 and 32 itself and / or the repulsive force generated from the fluid 41 itself filled in the assembly is also included. Therefore, when the semi-hollow molded products 31 and 32 themselves and / or the fluid 41 itself has high strength, or when the fluid 41 is filled with high density, the repulsive force is high, If the pressure by the injection of the molten resin 35 ′ can be sufficiently tolerated by itself, it is not necessary to perform the internal pressure increasing step.
開口３４を塞ぐ部材４２として、ピストンの機能を有する金属シャフトが挙げられる。中空部３３に、流動体４１を中空部３３の容積と略同じ体積になるように収容した後、開口３４を塞ぐ部材３４を開口３４に挿入する。その後、スライド金型１１を型締めすることで、中空部３３に収容されている流動体４１を圧縮する。そうすることで、一対の半中空成形品３１、３２の内部から外部にかかる圧力を大きくすることができる。 An example of the member 42 that closes the opening 34 is a metal shaft having a piston function. After the fluid 41 is accommodated in the hollow portion 33 so as to have substantially the same volume as the hollow portion 33, a member 34 that closes the opening 34 is inserted into the opening 34. Then, the fluid 41 accommodated in the hollow portion 33 is compressed by clamping the slide mold 11. By doing so, the pressure applied from the inside to the outside of the pair of semi-hollow molded products 31 and 32 can be increased.
［（Ｅ）流動体排出工程］
流動体排出工程では、２次成形された中空成形品の中空部３３から、中空部３３に充填されていた流動体４１を外部に排出する。これにより、中空成形品の中空部３３を中空の状態にすることができる。
[(E) Fluid discharge process]
In the fluid discharge step, the fluid 41 filled in the hollow portion 33 is discharged from the hollow portion 33 of the hollow molded product that has been secondarily formed. Thereby, the hollow part 33 of a hollow molded product can be made into a hollow state.
流動体の排出は、中空成形品の中空部３３に設けられた開口３４から行う。例えば、溶融樹脂３５’が硬化して硬化物になった後、開口３４を塞ぐ部材４２を開口３４から外し、流動体４１を開口３４から排出する。本実施形態では、流動体４１を粉末又は溶液の状態で排出できるため、中空部３３に設けられている開口３４が小さくても、流動体４１の排出を容易に行うことができる。 The fluid is discharged from the opening 34 provided in the hollow portion 33 of the hollow molded product. For example, after the molten resin 35 ′ is cured to become a cured product, the member 42 that closes the opening 34 is removed from the opening 34, and the fluid 41 is discharged from the opening 34. In this embodiment, since the fluid 41 can be discharged in a powder or solution state, the fluid 41 can be easily discharged even if the opening 34 provided in the hollow portion 33 is small.
ここで、流動体４１が溶液に対して可溶性を呈する場合は、中空成形品の中空部３３に、流動体４１を溶かすことの可能な溶液を供給し、その溶液に流動体４１を溶かすことが好ましい。これにより、流動体４１を中空部３３からの排出を促進でき、かつ、中空部３３を溶液で洗浄することができる。 Here, when the fluid 41 is soluble in the solution, a solution capable of dissolving the fluid 41 is supplied to the hollow portion 33 of the hollow molded article, and the fluid 41 is dissolved in the solution. preferable. Thereby, discharge | emission of the fluid 41 from the hollow part 33 can be accelerated | stimulated, and the hollow part 33 can be wash | cleaned with a solution.
中空成形品の中空部３３に供給する溶液としては、水、温水、エタノール、アセトンなどの有機溶媒等が挙げられる。中でも、中空成形品の製造コストの面で有利な点で、溶媒として水を用いることが好ましい、また、溶液は純粋な溶液であってもよいが、特に中空成形品の材料として耐薬品性の高い材料を用いている場合は、必要に応じて酸やアルカリ等を含んだものであってもよい。 Examples of the solution supplied to the hollow portion 33 of the hollow molded product include organic solvents such as water, warm water, ethanol, and acetone. Among them, it is preferable to use water as a solvent because it is advantageous in terms of the manufacturing cost of the hollow molded article, and the solution may be a pure solution. In the case of using a high material, it may contain an acid, an alkali or the like as necessary.
溶液を中空部３３に供給すると、溶液と流動体４１とが接触し、流動体４１が溶液に溶ける。このとき、溶液と流動体４１との間で化学反応が起こっていてもよく、流動体４１又はその反応生成物が溶液に溶解又は分散することで、溶液に溶けた状態になればよい。 If a solution is supplied to the hollow part 33, a solution and the fluid 41 will contact and the fluid 41 will melt | dissolve in a solution. At this time, a chemical reaction may occur between the solution and the fluid 41, and the fluid 41 or a reaction product thereof may be dissolved or dispersed in the solution to be in a state dissolved in the solution.
〔第２の実施形態〕
続いて、図２を参照しながら、本発明の第２の実施形態について説明する。
[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
図２は、第１の半中空成形品３１の接合部３１Ａと第２の半中空成形品３２の接合部３２Ａとを突き合わせ、中空部３３を形成したときの射出成形装置２０の状態を示す模式図である。 FIG. 2 is a schematic view showing a state of the injection molding apparatus 20 when the joining portion 31A of the first semi-hollow molded product 31 and the joining portion 32A of the second semi-hollow molded product 32 are abutted to form the hollow portion 33. FIG.
第１の実施形態では、（Ｃ）充填工程の後に内圧上昇工程を行うにあたり、開口３４を塞ぐ部材４２を開口３４に挿入した後、スライド金型を型締めすることで、一対の半中空成形品３１、３２の外部から穴を塞ぐ部材４２に向けて力を加え、一対の半中空成形品３１、３２の内部から外部にかかる圧力を大きくした。第２の実施形態における射出成形装置２０は、開口３４を塞ぐ部材４２が設置される位置の略上方に、溶融樹脂３５’を供給する配管４３を備える。そして、第２の実施形態では、（Ｃ）充填工程の後に（Ｄ）２次成形工程を行うにあたって、一対の半中空成形品３１、３２の接合部３１Ａ、３２Ａの外周に、溶融樹脂３５’を射出するだけでなく、溶融樹脂３５’を接合部３１Ａ、３２Ａの外周に射出する射出圧力を、開口３４を塞ぐ部材４２にも加えることで、一対の半中空成形品３１、３２の内部から外部にかかる圧力を大きくする。この点で、第２の実施形態は、第１の実施形態とは異なる。 In the first embodiment, when the internal pressure increasing step is performed after the (C) filling step, the member 42 that closes the opening 34 is inserted into the opening 34, and then the slide mold is clamped to form a pair of semi-hollow moldings. A force was applied from the outside of the products 31 and 32 toward the member 42 that blocks the hole, and the pressure applied from the inside to the outside of the pair of semi-hollow molded products 31 and 32 was increased. The injection molding apparatus 20 in the second embodiment includes a pipe 43 that supplies the molten resin 35 ′ substantially above the position where the member 42 that closes the opening 34 is installed. And in 2nd Embodiment, in performing the (D) secondary shaping | molding process after a (C) filling process, it is molten resin 35 'on the outer periphery of the junction parts 31A and 32A of a pair of semi-hollow molded products 31 and 32. In addition to injecting molten resin 35 ′ to the outer peripheries of the joint portions 31 A and 32 A, an injection pressure is also applied to the member 42 that closes the opening 34, so that the inside of the pair of semi-hollow molded products 31 and 32 Increase the external pressure. In this regard, the second embodiment is different from the first embodiment.
配管４３の断面積は、開口３４を塞ぐ部材４２の断面積と略同じであることが好ましい。そうすることで、一対の半中空成形品３１、３２の外部から穴を塞ぐ部材４２に向けて力を均一に加えることができる。 The cross-sectional area of the pipe 43 is preferably substantially the same as the cross-sectional area of the member 42 that closes the opening 34. By doing so, force can be applied uniformly toward the member 42 that closes the hole from the outside of the pair of semi-hollow molded products 31 and 32.
なお、図２において、図１と同じ符号が用いられる部材については、第１の実施形態において説明された内容と同じである。 In FIG. 2, members for which the same reference numerals as those in FIG. 1 are used are the same as those described in the first embodiment.
以下、本発明を実施例によりさらに詳細に説明するが、本発明はこれらの実施例によって限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by these Examples.
＜実施例＞
図１に記載の射出成形装置１０を用いて、１０個の中空成形品を得た。その際、各条件は、以下のとおりとした。
（Ａ）１次成形工程
１次成形樹脂：ポリフェニレンサルファイド樹脂（製品名：ジュラファイド ０２２０Ａ９、ビカット軟化点：２５０℃、ポリプラスチックス社製）
１次成形の条件：（予備乾燥）１４０℃、３時間、（シリンダ温度）３２０℃、（金型温度）１５０℃、（射出速度）２０ｍｍ／ｓｅｃ、（保圧）５０ＭＰａ
１次成形品の肉厚：２ｍｍ
開口３４の断面積：２８．２６ｍｍ２
中空部３３の容積：２０３２１．１ｍｍ３
中空部３３の容積（単位：ｍｍ３）の開口３４の断面積（単位：ｍｍ２）に対する比（中空部３３の容積／開口３４の断面積）：７１９
（Ｃ）充填工程
中空部３３に、流動体４１として食塩（塩化ナトリウム）を、中空部３３の容積と略同じ体積になるように収容した。
（Ｄ）２次成形工程
スライド金型１１を、型締め圧力：１００ｔｏｎにて型締めすることで、中空部３３に収容されている流動体４１を圧縮した。その後、２次成形に係る溶融樹脂３５’を射出した。
２次成形樹脂：ポリフェニレンサルファイド樹脂（製品名：ジュラファイド ０２２０Ａ９、ビカット軟化点：２５０℃、ポリプラスチックス社製）
２次成形の条件：（予備乾燥）１４０℃、３時間、（シリンダ温度）３２０℃、（金型温度）１５０℃、（射出速度）２０ｍｍ／ｓｅｃ、（保圧）５０ＭＰａ
（Ｅ）流動体排出工程
開口３４を塞ぐ部材４２を開口３４から外し、中空成形品の中空部３３に水を供給し、流動体４１（食塩）を水で溶かすことで、流動体４１（食塩）を開口３４から排出した。
<Example>
Ten hollow molded articles were obtained using the injection molding apparatus 10 shown in FIG. At that time, each condition was as follows.
(A) Primary molding process Primary molding resin: Polyphenylene sulfide resin (Product name: Durafide 0220A9, Vicat softening point: 250 ° C., manufactured by Polyplastics)
Primary molding conditions: (preliminary drying) 140 ° C., 3 hours, (cylinder temperature) 320 ° C., (mold temperature) 150 ° C., (injection speed) 20 mm / sec, (holding pressure) 50 MPa
Wall thickness of primary molded product: 2mm
Cross-sectional area of the opening 34: 28.26 mm 2
Volume of the hollow portion 33: 20321.1 mm 3
Ratio of volume of hollow portion 33 (unit: mm 3 ) to cross-sectional area (unit: mm 2 ) of opening 34 (volume of hollow portion 33 / cross-sectional area of opening 34): 719
(C) Filling Step Salt (sodium chloride) as the fluid 41 was accommodated in the hollow portion 33 so as to have substantially the same volume as the volume of the hollow portion 33.
(D) Secondary molding process The fluid 41 accommodated in the hollow part 33 was compressed by clamping the slide mold 11 with a clamping pressure of 100 ton. Thereafter, molten resin 35 ′ for secondary molding was injected.
Secondary molding resin: Polyphenylene sulfide resin (Product name: Durafide 0220A9, Vicat softening point: 250 ° C., manufactured by Polyplastics)
Secondary molding conditions: (preliminary drying) 140 ° C., 3 hours, (cylinder temperature) 320 ° C., (mold temperature) 150 ° C., (injection speed) 20 mm / sec, (holding pressure) 50 MPa
(E) Fluid discharging step The member 42 that closes the opening 34 is removed from the opening 34, water is supplied to the hollow portion 33 of the hollow molded article, and the fluid 41 (salt) is dissolved in water, whereby the fluid 41 (salt) ) Was discharged from the opening 34.
＜比較例１＞
中空部３３に、流動体４１として食塩（塩化ナトリウム）を、中空部３３の容積と略同じ体積になるように収容した後、スライド金型１１の型締めを行うことなく、２次成形に係る溶融樹脂３５’を射出した。それ以外は、実施例と同じ手法にて、１０個の中空成形品を得た。
<Comparative Example 1>
After accommodating sodium chloride (sodium chloride) as the fluid 41 in the hollow portion 33 so as to have substantially the same volume as the volume of the hollow portion 33, secondary molding is performed without clamping the slide mold 11. Molten resin 35 'was injected. Other than that, ten hollow molded articles were obtained by the same method as in the example.
＜比較例２＞
図５に記載の射出成形装置１００を用いて、１０個の中空成形品を得た。すなわち、中空成形品の中空部３３に流動体４１を充填することなく、２次成形に係る溶融樹脂３５’を射出した。
<Comparative example 2>
Ten hollow molded articles were obtained using the injection molding apparatus 100 shown in FIG. That is, the molten resin 35 ′ related to the secondary molding was injected without filling the fluid 41 in the hollow portion 33 of the hollow molded product.
＜評価＞
実施例、比較例１、比較例２のそれぞれについて、中空成形品の外観を評価した。図３に示すように、外観に不良が認められないものを良品とした。図４の（Ａ）に示すように、２次成形での射出圧力によって一対の半中空成形品の形状に変形が認められるものを不良品１とした。図４の（Ｂ）に示すように、２次成形での射出圧力によって一対の半中空成形品が破壊し、２次成形で供給される溶融材料が一対の半中空成形品の中空部に流れ込んだものを不良品２とした。そして、良品、不良品１、不良品２の数をカウントした。結果を表１に示す。
<Evaluation>
For each of the example, comparative example 1, and comparative example 2, the appearance of the hollow molded article was evaluated. As shown in FIG. 3, a non-defective product was determined as a non-defective product. As shown in FIG. 4A, a defective product 1 is defined as one in which deformation is recognized in the shape of a pair of semi-hollow molded products due to injection pressure in secondary molding. As shown in FIG. 4 (B), the pair of semi-hollow molded products are destroyed by the injection pressure in the secondary molding, and the molten material supplied in the secondary molding flows into the hollow portions of the pair of semi-hollow molded products. The product was designated as defective 2. The number of non-defective products, defective products 1 and defective products 2 was counted. The results are shown in Table 1.
実施例の中空成形品は、１次成形品の肉厚が２ｍｍと薄肉であり、開口の断面積が２８．２６ｍｍ２、中空部の容積が２０３２１．１ｍｍ３、中空部の容積／開口の断面積が７１９と開口部が小さい形状であるが、全体の１００％が良品である。その結果、実施例によると、薄肉、小型であっても中空部の容積が確保された中空成形品を低コストで効率よく量産できるといえる。さらに、開口部に対し中空部の容積が大きく、袋状弾性体を用いる従来技術では、中空部から取り出すことが困難な形状（いわゆる「不可能ボトル形状」）であっても、流動体を開口から容易に排出することができる。 The hollow molded product of the example is as thin as 2 mm in the thickness of the primary molded product, the cross-sectional area of the opening is 28.26 mm 2 , the volume of the hollow portion is 20321.1 mm 3 , and the volume of the hollow portion / breakage of the opening Although the area is 719 and the opening is small, 100% of the total is good. As a result, according to the examples, it can be said that a hollow molded product in which the volume of the hollow portion is ensured can be mass-produced efficiently at low cost even if it is thin and small. Furthermore, the volume of the hollow part is larger than the opening part, and the conventional technique using a bag-like elastic body opens the fluid even if it is difficult to take out from the hollow part (so-called “impossible bottle shape”). Can be easily discharged.
それに対し、比較例１の中空成形品は、良品が全体の３０％にとどまり、比較例２の中空成形品は、良品が全体の１０％にとどまる。したがって、比較例１及び２の製造方法では、１次成形品に対し、厚肉化、リブ補強等の対策が必要となり、中空部の容積を確保するため、一対の半中空成形品を大型化しなければならない。この点で、比較例１及び２の製造方法では、実施例に比べ、中空成形品を設計する際の自由度が劣る。 In contrast, the hollow molded product of Comparative Example 1 has only 30% of the non-defective product, and the hollow molded product of Comparative Example 2 has only 10% of the non-defective product. Therefore, in the manufacturing methods of Comparative Examples 1 and 2, measures such as thickening and rib reinforcement are required for the primary molded product, and the pair of semi-hollow molded products is enlarged in order to secure the volume of the hollow portion. There must be. In this regard, in the manufacturing methods of Comparative Examples 1 and 2, the degree of freedom in designing a hollow molded product is inferior compared to the Examples.
１０ 射出成形装置
３１ 第１の半中空成形品
３２ 第２の半中空成形品
３３ 中空部
３４ 開口
３５’ 溶融材料（溶融樹脂）
４１ 流動体
４２ 開口を塞ぐ部材
DESCRIPTION OF SYMBOLS 10 Injection molding apparatus 31 1st semi-hollow molded product 32 2nd semi-hollow molded product 33 Hollow part 34 Opening 35 'Molten material (molten resin)
41 Fluid 42 Member for closing opening
Claims (6)
前記一対の半中空成形品の接合部どうしを突き合わせる突き合わせ工程と、
前記突き合わせ工程の前又は後に、前記一対の半中空成形品の中空部に流動体を充填する充填工程と、
前記充填工程の後、前記一対の半中空成形品の接合部の外周に、溶融樹脂を射出し、前記一対の半中空成形品の内部から外部にかかる圧力が、前記一対の半中空成形品の外部から内部にかかる圧力以上である状態で、前記一対の半中空成形品を一体化し、中空成形品を得る２次成形工程と、
前記中空成形品の中空部から前記流動体を排出する流動体排出工程とを含み、
前記充填工程で充填する流動体の沸点は、前記２次成形工程で射出する材料の温度よりも高い、中空成形品の製造方法。 A primary molding step of molding a pair of semi-hollow molded articles having joints;
A butting step of butting the joints of the pair of semi-hollow molded articles;
Before or after the abutting step, a filling step of filling a fluid into the hollow portions of the pair of semi-hollow molded products,
After the filling step, molten resin is injected into the outer periphery of the joint part of the pair of semi-hollow molded products, and the pressure applied from the inside to the outside of the pair of semi-hollow molded products A secondary molding step of integrating the pair of semi-hollow molded products to obtain a hollow molded product in a state where the pressure applied from the outside to the inside is higher than,
Including a fluid discharge step of discharging the fluid from the hollow portion of the hollow molded article,
The boiling point of the fluid filled in the filling step is a method for producing a hollow molded article, which is higher than the temperature of the material injected in the secondary molding step.
前記充填工程の後、前記穴を塞ぐ部材を前記穴に挿入し、前記一対の半中空成形品の外部から前記穴を塞ぐ部材に向けて力を加えることで、前記一対の半中空成形品の内部から外部にかかる圧力を大きくする内圧上昇工程をさらに含み、
前記２次成形工程は、前記内圧上昇工程によって、前記一対の半中空成形品の内部から外部にかかる圧力が、前記一対の半中空成形品の外部から内部にかかる圧力以上にされた状態で、前記一対の半中空成形品の接合部の外周に、溶融樹脂を射出する工程であり、
前記流動体排出工程は、前記穴を塞ぐ部材を前記穴から外し、前記流動体を前記穴から排出する工程である、請求項１に記載の中空成形品の製造方法。 A hole is formed in at least one of the pair of semi-hollow molded products,
After the filling step, a member that closes the hole is inserted into the hole, and a force is applied to the member that closes the hole from the outside of the pair of semi-hollow molded products. An internal pressure increasing step for increasing the pressure applied from the inside to the outside;
In the secondary molding step, the pressure applied from the inside to the outside of the pair of semi-hollow molded products is equal to or higher than the pressure applied from the outside to the inside of the pair of semi-hollow molded products by the internal pressure increasing step. It is a step of injecting molten resin to the outer periphery of the joint part of the pair of semi-hollow molded products,
The said fluid discharge | emission process is a manufacturing method of the hollow molded product of Claim 1 which is a process of removing the member which plugs up the said hole from the said hole, and discharging | emitting the said fluid from the said hole.
前記突き合わせ工程は、前記スライド金型を、前記スライド金型の成形面が前記固定金型の成形面に対向するように移動させて、前記一対の半中空成形品の接合部どうしを突き合わせる工程であり、
前記内圧上昇工程は、前記穴を塞ぐ部材を前記穴に挿入した後、前記スライド金型を型締めすることで、前記一対の半中空成形品の内部から外部にかかる圧力を大きくする工程である、請求項２に記載の中空成形品の製造方法。 In the primary molding step, molten resin is injected into a cavity formed by a fixed mold and a slide mold, and one semi-hollow molded product is bonded to the molding surface of the fixed mold. And forming the other semi-hollow molded product on the molding surface of the slide mold so as to have a joint and the hole,
The abutting step is a step of abutting the joint portions of the pair of semi-hollow molded articles by moving the slide mold so that the molding surface of the slide mold faces the molding surface of the fixed mold. And
The internal pressure increasing step is a step of increasing the pressure applied from the inside to the outside of the pair of semi-hollow molded products by inserting a member for closing the hole into the hole and then clamping the slide mold. The method for producing a hollow molded article according to claim 2.
前記２次成形工程は、
前記穴を塞ぐ部材を前記穴に挿入することと、
前記一対の半中空成形品の接合部の外周に、溶融樹脂を射出することと、
前記溶融樹脂を前記接合部の外周に射出する射出圧力を、前記穴を塞ぐ部材に加えることとを含む、請求項１に記載の中空成形品の製造方法。 A hole is formed in at least one of the pair of semi-hollow molded products,
The secondary molding step includes
Inserting a member for closing the hole into the hole;
Injecting molten resin to the outer periphery of the joint part of the pair of semi-hollow molded products;
The method for producing a hollow molded article according to claim 1, further comprising: applying an injection pressure for injecting the molten resin to an outer periphery of the joint portion to a member that closes the hole.
前記充填工程で充填する前記粉体の融点は、前記２次成形工程で射出する材料の温度よりも高い、請求項１から４のいずれかに記載の中空成形品の製造方法。 The fluid is a powder,
The method for producing a hollow molded product according to any one of claims 1 to 4, wherein a melting point of the powder filled in the filling step is higher than a temperature of a material injected in the secondary forming step.
前記粉体排出工程は、前記中空成形品の中空部に水溶液を供給し、前記粉体を前記水溶液で溶かす工程を含む、請求項５に記載の中空成形品の製造方法。 The powder is water soluble,
The said powder discharge | emission process is a manufacturing method of the hollow molded product of Claim 5 including the process of supplying aqueous solution to the hollow part of the said hollow molded product, and melt | dissolving the said powder with the said aqueous solution.
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| WO2022091844A1 (en) * | 2020-11-02 | 2022-05-05 | 株式会社バンダイ | Model component and model component production method |
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| KR102148617B1 (en) * | 2019-12-23 | 2020-08-27 | 고정훈 | Manufacturing method of faucet main body using dissolution core and faucet main body manufacturied by the same |
| WO2022091844A1 (en) * | 2020-11-02 | 2022-05-05 | 株式会社バンダイ | Model component and model component production method |
| JP2022073659A (en) * | 2020-11-02 | 2022-05-17 | 株式会社バンダイ | Model component and manufacturing method of model component |
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