JP5040374B2 - 金型組立体及び射出成形方法 - Google Patents
金型組立体及び射出成形方法 Download PDFInfo
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- JP5040374B2 JP5040374B2 JP2007057310A JP2007057310A JP5040374B2 JP 5040374 B2 JP5040374 B2 JP 5040374B2 JP 2007057310 A JP2007057310 A JP 2007057310A JP 2007057310 A JP2007057310 A JP 2007057310A JP 5040374 B2 JP5040374 B2 JP 5040374B2
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- UAMZXLIURMNTHD-UHFFFAOYSA-N dialuminum;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Mg+2].[Al+3].[Al+3] UAMZXLIURMNTHD-UHFFFAOYSA-N 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- JBSLOWBPDRZSMB-FPLPWBNLSA-N dibutyl (z)-but-2-enedioate Chemical compound CCCCOC(=O)\C=C/C(=O)OCCCC JBSLOWBPDRZSMB-FPLPWBNLSA-N 0.000 description 1
- 229940100539 dibutyl adipate Drugs 0.000 description 1
- AYOHIQLKSOJJQH-UHFFFAOYSA-N dibutyltin Chemical class CCCC[Sn]CCCC AYOHIQLKSOJJQH-UHFFFAOYSA-N 0.000 description 1
- HBGGXOJOCNVPFY-UHFFFAOYSA-N diisononyl phthalate Chemical compound CC(C)CCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCC(C)C HBGGXOJOCNVPFY-UHFFFAOYSA-N 0.000 description 1
- PWEVMPIIOJUPRI-UHFFFAOYSA-N dimethyltin Chemical class C[Sn]C PWEVMPIIOJUPRI-UHFFFAOYSA-N 0.000 description 1
- HGQSXVKHVMGQRG-UHFFFAOYSA-N dioctyltin Chemical class CCCCCCCC[Sn]CCCCCCCC HGQSXVKHVMGQRG-UHFFFAOYSA-N 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- WDCPOHDQDCNUAC-UHFFFAOYSA-N hexanedioic acid hex-1-yne Chemical compound C#CCCCC.C(CCCCC(=O)O)(=O)O WDCPOHDQDCNUAC-UHFFFAOYSA-N 0.000 description 1
- 229920005669 high impact polystyrene Polymers 0.000 description 1
- 239000004797 high-impact polystyrene Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 239000002563 ionic surfactant Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 150000002611 lead compounds Chemical class 0.000 description 1
- OCWMFVJKFWXKNZ-UHFFFAOYSA-L lead(2+);oxygen(2-);sulfate Chemical compound [O-2].[O-2].[O-2].[Pb+2].[Pb+2].[Pb+2].[Pb+2].[O-]S([O-])(=O)=O OCWMFVJKFWXKNZ-UHFFFAOYSA-L 0.000 description 1
- UMKARVFXJJITLN-UHFFFAOYSA-N lead;phosphorous acid Chemical compound [Pb].OP(O)O UMKARVFXJJITLN-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000005300 metallic glass Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- DJDSLBVSSOQSLW-UHFFFAOYSA-N mono(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(O)=O DJDSLBVSSOQSLW-UHFFFAOYSA-N 0.000 description 1
- KINULKKPVJYRON-PVNXHVEDSA-N n-[(e)-[10-[(e)-(4,5-dihydro-1h-imidazol-2-ylhydrazinylidene)methyl]anthracen-9-yl]methylideneamino]-4,5-dihydro-1h-imidazol-2-amine;hydron;dichloride Chemical compound Cl.Cl.N1CCN=C1N\N=C\C(C1=CC=CC=C11)=C(C=CC=C2)C2=C1\C=N\NC1=NCCN1 KINULKKPVJYRON-PVNXHVEDSA-N 0.000 description 1
- WIBFFTLQMKKBLZ-SEYXRHQNSA-N n-butyl oleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCCCC WIBFFTLQMKKBLZ-SEYXRHQNSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 150000002816 nickel compounds Chemical class 0.000 description 1
- TXIYCNRKHPXJMW-UHFFFAOYSA-N nickel;1-octyl-2-(2-octylphenyl)sulfanylbenzene Chemical compound [Ni].CCCCCCCCC1=CC=CC=C1SC1=CC=CC=C1CCCCCCCC TXIYCNRKHPXJMW-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 150000002898 organic sulfur compounds Chemical class 0.000 description 1
- 150000002903 organophosphorus compounds Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229910002077 partially stabilized zirconia Inorganic materials 0.000 description 1
- DDBREPKUVSBGFI-UHFFFAOYSA-N phenobarbital Chemical group C=1C=CC=CC=1C1(CC)C(=O)NC(=O)NC1=O DDBREPKUVSBGFI-UHFFFAOYSA-N 0.000 description 1
- 239000002530 phenolic antioxidant Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229960000969 phenyl salicylate Drugs 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- QVLTXCYWHPZMCA-UHFFFAOYSA-N po4-po4 Chemical class OP(O)(O)=O.OP(O)(O)=O QVLTXCYWHPZMCA-UHFFFAOYSA-N 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 229940098458 powder spray Drugs 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- LVEOKSIILWWVEO-UHFFFAOYSA-N tetradecyl 3-(3-oxo-3-tetradecoxypropyl)sulfanylpropanoate Chemical compound CCCCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCCCC LVEOKSIILWWVEO-UHFFFAOYSA-N 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
- WEAPVABOECTMGR-UHFFFAOYSA-N triethyl 2-acetyloxypropane-1,2,3-tricarboxylate Chemical compound CCOC(=O)CC(C(=O)OCC)(OC(C)=O)CC(=O)OCC WEAPVABOECTMGR-UHFFFAOYSA-N 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 1
- 238000005019 vapor deposition process Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Images
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Description
(A)第1金型部、第2金型部、及び、第1金型部に設けられた溶融樹脂射出部を備え、第1金型部と第2金型部との型締めによってキャビティが形成される金型、並びに、
(B)第1金型部及び/又は第2金型部に配置され、キャビティを構成する面を形成する入れ子、
を備えた金型組立体であって、
入れ子は、
(a)金属製ブロック、
(b)金属製ブロックの少なくともキャビティに面した表面に形成された、厚さ0.03mm乃至1mmの金属下地層、及び、
(c)金属下地層上に形成された、セラミックスから成る溶射皮膜、
から構成されており、
溶射皮膜は、厚さ方向に変化した気孔率を有し、
該気孔率は、溶射皮膜表面に近い側ほど、低い値であることを特徴とする。
(イ)第1金型部と第2金型部とを型締めしてキャビティを形成した後、溶融樹脂射出部から溶融熱可塑性樹脂をキャビティ内に射出し、次いで、
(ロ)キャビティ内の熱可塑性樹脂を冷却、固化し、その後、得られた成形品を金型から離型する、
工程を具備することを特徴とする。
(イ)成形すべき成形品の容積よりもキャビティの容積が大きくなるように、第1金型部と第2金型部とを型締めした後、溶融樹脂射出部から溶融熱可塑性樹脂をキャビティ内に射出し、
(ロ)溶融熱可塑性樹脂の射出開始と同時に、あるいは射出中に、あるいは射出完了と同時に、あるいは射出完了後、キャビティの容積を成形すべき成形品の容積まで減少させ、その後、
(ハ)キャビティ内の熱可塑性樹脂を冷却、固化し、その後、得られた成形品を金型から離型する、
工程を具備することを特徴とする。
(A)第1金型部(固定金型部)11、第2金型部(可動金型部)12、及び、第1金型部11に設けられた溶融樹脂射出部14A,14Bを備え、第1金型部11と第2金型部12との型締めによってキャビティ13が形成される金型、並びに、
(B)第1金型部11及び第2金型部12に配置され、キャビティ13を構成する面を形成する入れ子20A,20B、
を備えている。尚、溶融樹脂射出部14A,14Bは、ゲート点数が2点のサイドゲート構造を有する。そして、図1の(A)に模式的な断面図を示し、図1の(B)に拡大した模式的な一部断面図を示すように、入れ子20A,20Bは、
(a)金属製ブロック31A,31B、
(b)金属製ブロック31A,31Bの少なくともキャビティ13に面した表面(金属製ブロック31A,31Bの頂面)に形成された、厚さ0.03mm乃至1mmの金属下地層32A,32B、及び、
(c)金属下地層32A,32B上に形成された、セラミックスから成る溶射皮膜33A,33B、
から構成されている。
射出成形機 :東芝機械株式会社IS1300E
熱可塑性樹脂:ポリカーボネート樹脂/ABS樹脂(三菱エンジニアリングプラスチックス株式会社製 MB2214)
樹脂温度 :260゜C
金型温度 :60゜C
射出圧力 :130MPa
射出成形機 :日精樹脂工業株式会社AZ7000
熱可塑性樹脂:PC/ABS樹脂(三菱エンジニアリングプラスチックス株式会社製 MB8300)
樹脂温度 :260゜C
金型温度 :70゜C
射出圧力 :100MPa
射出成形機 :日精樹脂工業株式会社AZ7000
熱可塑性樹脂:PC樹脂(三菱エンジニアリングプラスチックス株式会社製 H3000R)
樹脂温度 :290゜C
金型温度 :80゜C
射出圧力 :80MPa
射出成形機 :日精樹脂工業株式会社AZ7000
熱可塑性樹脂:PC/PBT樹脂(三菱エンジニアリングプラスチックス株式会社製 MB4303)
樹脂温度 :270゜C
金型温度 :80゜C
射出圧力 :80MPa
Claims (8)
- (A)第1金型部、第2金型部、及び、第1金型部に設けられた溶融樹脂射出部を備え、第1金型部と第2金型部との型締めによってキャビティが形成される金型、並びに、
(B)第1金型部及び/又は第2金型部に配置され、キャビティを構成する面を形成する入れ子、
を備えた金型組立体であって、
入れ子は、
(a)金属製ブロック、
(b)金属製ブロックの少なくともキャビティに面した表面に形成された、厚さ0.03mm乃至1mmの金属下地層、及び、
(c)金属下地層上に形成された、セラミックスから成る溶射皮膜、
から構成されており、
溶射皮膜は、組成の異なる単位層が、複数、積層された構造を有し、
溶射皮膜表面から溶射皮膜内部に向かって厚さ0.05mmまでの部分における気孔率平均値は1.0%乃至1.3%であり、金属下地層と溶射皮膜との界面から溶射皮膜内部に向かって厚さ0.2mmまでの部分における気孔率平均値は5%以上10%以下であり、
溶射皮膜表面の表面粗さRaは0.05μm以下であることを特徴とする金型組立体。 - キャビティに面した入れ子の表面の全てが溶射皮膜から構成されていることを特徴とする請求項1に記載の金型組立体。
- キャビティに面した入れ子の表面は、一部が溶射皮膜から構成されており、残部には金属製ブロックが露出していることを特徴とする請求項1に記載の金型組立体。
- 溶射皮膜の熱伝導率は、1W/(m・K)乃至4W/(m・K)であり、
溶射皮膜の平均厚さは、0.3mm乃至2.0mmであることを特徴とする請求項1乃至請求項3のいずれか1項に記載の金型組立体。 - 溶射皮膜表面から溶射皮膜内部に向かって厚さ0.05mmまでの部分における溶射皮膜を構成する材料の平均粒径は2×10-6m乃至5×10-5mであり、金属下地層と溶射皮膜との界面から溶射皮膜内部に向かって厚さ0.2mmまでの部分における溶射皮膜を構成する材料の平均粒径は2×10-5m乃至1×10-4mであることを特徴とする請求項1乃至請求項4のいずれか1項に記載の金型組立体。
- (A)第1金型部、第2金型部、及び、第1金型部に設けられた溶融樹脂射出部を備え、第1金型部と第2金型部との型締めによってキャビティが形成される金型、並びに、
(B)第1金型部及び/又は第2金型部に配置され、キャビティを構成する面を形成する入れ子、
を備えた金型組立体であって、
入れ子は、
(a)金属製ブロック、
(b)金属製ブロックの少なくともキャビティに面した表面に形成された、厚さ0.03mm乃至1mmの金属下地層、及び、
(c)金属下地層上に形成された、セラミックスから成る溶射皮膜、
から構成されており、
溶射皮膜は、組成の異なる単位層が、複数、積層された構造を有し、
溶射皮膜表面から溶射皮膜内部に向かって厚さ0.05mmまでの部分における気孔率平均値は1.0%乃至1.3%であり、金属下地層と溶射皮膜との界面から溶射皮膜内部に向かって厚さ0.2mmまでの部分における気孔率平均値は5%以上10%以下であり、
溶射皮膜表面の表面粗さRaは0.05μm以下である金型組立体を用いた射出成形方法であって、
(イ)第1金型部と第2金型部とを型締めしてキャビティを形成した後、溶融樹脂射出部から溶融熱可塑性樹脂をキャビティ内に射出し、次いで、
(ロ)キャビティ内の熱可塑性樹脂を冷却、固化し、その後、得られた成形品を金型から離型する、
工程を具備することを特徴とする射出成形方法。 - キャビティに連通した加圧流体注入ノズルを更に備えた金型組立体を用い、
前記工程(イ)において、溶融樹脂射出部から溶融熱可塑性樹脂をキャビティ内に射出中に、あるいは射出完了と同時に、あるいは射出完了後、キャビティ内に射出された溶融熱可塑性樹脂内に加圧流体注入ノズルから加圧流体の注入を開始することを特徴とする請求項6に記載に射出成形方法。 - (A)第1金型部、第2金型部、及び、第1金型部に設けられた溶融樹脂射出部を備え、第1金型部と第2金型部との型締めによってキャビティが形成される金型、並びに、
(B)第1金型部及び/又は第2金型部に配置され、キャビティを構成する面を形成する入れ子、
を備えた金型組立体であって、
入れ子は、
(a)金属製ブロック、
(b)金属製ブロックの少なくともキャビティに面した表面に形成された、厚さ0.03mm乃至1mmの金属下地層、及び、
(c)金属下地層上に形成された、セラミックスから成る溶射皮膜、
から構成されており、
溶射皮膜は、組成の異なる単位層が、複数、積層された構造を有し、
溶射皮膜表面から溶射皮膜内部に向かって厚さ0.05mmまでの部分における気孔率平均値は1.0%乃至1.3%であり、金属下地層と溶射皮膜との界面から溶射皮膜内部に向かって厚さ0.2mmまでの部分における気孔率平均値は5%以上10%以下であり、
溶射皮膜表面の表面粗さRaは0.05μm以下である金型組立体を用いた射出成形方法であって、
(イ)成形すべき成形品の容積よりもキャビティの容積が大きくなるように、第1金型部と第2金型部とを型締めした後、溶融樹脂射出部から溶融熱可塑性樹脂をキャビティ内に射出し、
(ロ)溶融熱可塑性樹脂の射出開始と同時に、あるいは射出中に、あるいは射出完了と同時に、あるいは射出完了後、キャビティの容積を成形すべき成形品の容積まで減少させ、その後、
(ハ)キャビティ内の熱可塑性樹脂を冷却、固化し、その後、得られた成形品を金型から離型する、
工程を具備することを特徴とする射出成形方法。
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