US20200078997A1 - System of manufacturing injection molded article and metal mold - Google Patents
System of manufacturing injection molded article and metal mold Download PDFInfo
- Publication number
- US20200078997A1 US20200078997A1 US16/561,102 US201916561102A US2020078997A1 US 20200078997 A1 US20200078997 A1 US 20200078997A1 US 201916561102 A US201916561102 A US 201916561102A US 2020078997 A1 US2020078997 A1 US 2020078997A1
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- United States
- Prior art keywords
- molten resin
- flow channel
- cavity
- metal mold
- temperature
- Prior art date
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- Abandoned
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- 239000002184 metal Substances 0.000 title claims abstract description 52
- 238000002347 injection Methods 0.000 title claims abstract description 46
- 239000007924 injection Substances 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 239000011347 resin Substances 0.000 claims abstract description 176
- 229920005989 resin Polymers 0.000 claims abstract description 176
- 239000010410 layer Substances 0.000 claims abstract description 17
- 239000012792 core layer Substances 0.000 claims abstract description 16
- 230000009969 flowable effect Effects 0.000 claims abstract description 11
- 238000010792 warming Methods 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 19
- 238000012546 transfer Methods 0.000 claims description 7
- 230000001629 suppression Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 42
- 230000008569 process Effects 0.000 abstract description 42
- 238000000465 moulding Methods 0.000 abstract description 14
- 238000001746 injection moulding Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
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- 230000008859 change Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000012768 molten material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
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- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2737—Heating or cooling means therefor
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2725—Manifolds
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2725—Manifolds
- B29C2045/2733—Inserts, plugs, bushings
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2737—Heating or cooling means therefor
- B29C2045/2754—Plurality of independent heating or cooling means, e.g. independently controlling the heating of several zones of the nozzle
Definitions
- Embodiments of this disclosure relate to a system of manufacturing an injection molded article and a metal mold.
- one aspect of the present disclosure provides a novel system of manufacturing injection molded articles. That is, in a mold injection process of injecting molten resin into a cavity of a metal mold, high temperature molten resin having a given temperature is injected in advance as a part of a single shot of molten resin into a cavity to later form a skin layer of an injection-molded article. Other molten resin having a low temperature near a flowable limit is subsequently injected into the cavity as another part of the single shot of molten resin to later form a core layer of the injection-molded article.
- Another aspect of the present disclosure provides a novel metal mold that includes a flow channel to guide low temperature resin (herein below referred to as a low temperature flow channel section) and a flow channel to warm the low temperature resin (herein below referred to as a high temperature flow channel section).
- the high temperature flow channel section includes a first flow channel located right before a cavity of a metal mold to warm molten resin injected in an early stage as a part of a single shot of molten resin until a high temperature to later form a skin layer of an injection molded article.
- the low temperature flow channel section includes a second flow channel connected to the first flow channel to retain heat of molten resin injected after the early stage as another part of the single shot of molten resin at a low temperature near the flowable limit to later form a core layer of the injection molded article.
- FIG. 1 is a diagram illustrating an exemplary general view of an injection molding machine with a metal mold structure according to a first embodiment of the present disclosure
- FIG. 2 is a cross-sectional view illustrating the metal mold of the first embodiment of the present disclosure
- FIG. 3 is a cross-sectional view illustrating the metal mold of the first embodiment of the present disclosure when molten resin is supplied to a flow channel:
- FIG. 4 is a cross-sectional view illustrating the metal mold of the first embodiment of the present disclosure when a cavity is filled with the molten resin:
- FIG. 5 is a cross-sectional view illustrating the metal mold of the first embodiment of the present disclosure when the molten resin in the cavity is solidified
- FIG. 6 is a cross-sectional view illustrating the metal mold of the first embodiment of the present disclosure when the metal mold is open:
- FIG. 7 is a diagram schematically illustrating exemplary behavior of molten resin in an initial stage of filling during an injection process:
- FIG. 8 is a diagram schematically illustrating exemplar) behavior of the molten resin in a medium stage of filling during the injection process
- FIG. 9 is a diagram schematically illustrating exemplary behavior of the molten resin during the injection process when the molten resin is completely filled.
- FIG. 10 is a diagram schematically illustrating an exemplary change in temperature of the resin in the cavity during the cooling process.
- FIG. 11 is a cross-sectional view illustrating a metal mold of a second embodiment of the present disclosure.
- an injection molding machine 10 is provided to manufacture a molded article by performing injection molding.
- the injection molding is a system to obtain a molded article (i.e., an injection molded article) by injecting molten material into a metal mold 40 and cooling and solidifying the molten material.
- the injection molding machine 10 includes a mold fastening section 31 and an injection section 32 .
- the injection section 32 heats and melts resin material and injects a melting result into the metal mold 40 .
- the injection section 32 includes a molten resin supply source.
- the injection section 32 controls injection speed when resin flows thru the metal mold 40 and controls pressure when the metal mold 40 has been filled with the resin.
- the mold fastening section 31 opens and closes the metal mold 40 and removes the molded article therefrom or the like.
- the metal mold 40 includes a fixed mold 41 and a movable mold 42 and is installed in the mold fastening section 31 .
- a cavity 43 is formed between the fixed and movable molds 41 and 42 as a space. Resin filled into the cavity 43 becomes a molded article when it is solidified therein.
- the movable mold 42 is disposed to be able to approach and separate from the fixed mold 41 .
- the metal mold 40 can be opened when the movable mold 42 is separated from the fixed mold 41 and closed when the movable mold 42 approaches the fixed mold 41 .
- the metal mold 40 is in a closed state.
- the fixed mold 41 includes a mounting plate 44 located on a side of the injection section 32 , a plate 45 to form a cavity 43 between itself and the movable mold 42 , and a spacer block 46 sandwiched between the mounting plate 44 and the plate 45 .
- the fixed mold 41 also includes a hot runner unit 47 mounting over the mounting plate 44 to the plate 45 . These devices other than the hot runner unit 47 can adopt other known suitable configurations.
- the hot runner unit 47 constitutes a flow channel ranging from a nozzle 33 of the injection section 32 to the cavity 43 to keep molten resin melted therein.
- the hot runner unit 47 includes a sprue 51 , a heat retention manifold 52 , and a warming manifold 53 .
- the hot runner unit 47 also includes a gate 54 .
- the sprue 51 is attached to the mounting plate 44 and is connected to the nozzle 33 .
- the sprue 51 includes a sprue flow channel 55 .
- a sprue heater 56 is provided in the sprue 51 .
- the heat retention manifold 52 is located between the mounting plate 44 and the plate 45 and is connected to the sprue 51 .
- the heat retention manifold 52 includes a heat retention flow channel 57 .
- the heat retention manifold 52 includes a heat retention heater 58 .
- Molten resin injected from the injection section 32 has a low temperature TL.
- molten resin having has a low temperature TL is referred to as low temperature resin 92 .
- the sprue heater 56 and the heat retention heater 58 are set to the low temperature TL or similar temperature.
- the sprue 51 and the heat retention manifold 52 keep the low temperature resin 92 injected from the injection section 32 warm at the low temperature TL.
- the low temperature TL is near a flowable limit temperature and is lower than a temperature TN of molten resin injected into the cavity when an ordinary injection molding operation is performed (herein below, referred to as a normal temperature TN).
- the warming manifold 53 is located between the mounting plate 44 and the plate 45 and is connected to the heat retention manifold 52 .
- the warming manifold 53 includes a warming flow channel 59 .
- the warming manifold 53 is provided with a warming heater 61 .
- the gate 54 is a valve gate and includes a valve body 62 disposed on the plate 45 , a valve pin 63 , and a driving section 64 to drive the valve pin 63 .
- the valve body 62 is connected to the warming manifold 53 and includes a valve flow channel 65 .
- the valve pin 63 is enabled to open and close a connection hole connecting the valve flow channel 65 with the cavity 43 .
- the valve body 62 is provided with a valve heater 66 .
- Each of the warming heater 61 and the valve heater 66 is set to a high temperature TH higher than the low temperature TL.
- the warming heater 61 and the valve heater 66 warm molten resin remaining in the warming flow channel 59 and the valve flow channel 65 until the high temperature TH.
- the high temperature TH is usually higher than an ordinary molding temperature TN, and is lower than either a resin color change temperature or a resin decomposition temperature.
- molten resin warmed until the high temperature TH is referred to as high-temperature resin 91 .
- FIG. 3 and following drawings to distinguish the high-temperature resin 91 and the low temperature resin 92 from each other, a hatching pattern therefor is differentiated.
- the high-temperature resin 91 and the low temperature resin 92 are basically the same resin with each other.
- the warming flow channel 59 and the valve flow channel 65 collectively constitute a first flow channel 71 located just before the cavity 43 .
- the warming manifold 53 and the gate 54 collectively constitute a high temperature flow channel section 75 .
- the high temperature flow channel section 75 is enabled to warm molten resin injected in an early stage as a part of a single shot of molten resin to later form a skin layer (i.e. a surface layer section) of a molded article until the high temperature TH.
- a capacity of high-temperature resin 91 is desirably equal to or more than a product obtained by calculating the below described formula:
- the thickness of the skin layer is set accordingly.
- the sprue flow channel 55 and the heat retention flow channel 57 collectively constitute a second flow channel 72 connected to the first flow channel 71 .
- the sprue 51 and the heat retention manifold 52 collectively constitute a low temperature flow channel section 76 .
- the low temperature flow channel section 76 is partially enabled to retain heat of molten resin injected after the early stage as another part of the single shot of molten resin to later form a core layer (i.e. an interior) of the molded article at the low temperature TL.
- the injection section 32 (see FIG. 1 ) pushes out a high-temperature resin 91 in the first flow channel 71 to the cavity 43 in advance, and subsequently pushes out a low temperature resin 92 in the second flow channel 72 to the cavity 43 .
- the resin is filled and solidified in the cavity 43 thereby becoming a molded article 20 .
- the high-temperature flow channel section 75 is enabled to warm the low temperature resin 92 until the high temperature TH within a given period of time calculated by summing up a cooling period of time for cooling and solidifying the resin as illustrated in FIG. 5 after the cavity 43 is filled with resin as illustrated in FIG. 4 , a mold opening period of time for opening the metal mold 40 and ejecting the molded article 20 as illustrated in FIG. 6 , and a metal mold closing period of time for closing the metal mold 40 as illustrated in FIG. 3 .
- the low temperature resin 92 is warmed until the high temperature TH within the total of the cooling period of time and the mold opening period of time, for example.
- the warming manifold 53 is connected to the heat retention manifold 52 through a connection section 81 .
- a void 82 is provided excluding a position of the connection section 81 .
- the void 82 suppresses heat transfer between the warming manifold 53 and the heat retention manifold 52 .
- the void 82 acts as a heat-transfer suppression section.
- the injection molding machine 10 manufactures a molded article by repeating the following first to fourth processes.
- a cycle of molding molded articles with the manufacturing system starts when the first process starts and ends when the fourth process is completed.
- a metal mold closing process is described. As illustrated in FIG. 3 , the metal mold 40 is closed in a metal mold closing process. It is supposed that when the mold closing process starts, the low temperature resin 92 remaining in the second flow channel 72 and the high temperature resin 91 remaining in the first flow channel 71 during the last molding cycle exist as are.
- molten resin is successively injected from the first flow channel 71 and second flow channel 72 connected with each other in order into the cavity 43 .
- high-temperature resin 91 existing in the first flow channel 71 is injected into the cavity 43 in advance as a part of a single shot of molten resin to later form a skin layer 21 of a molded article 20 (see FIG. 6 ).
- low temperature resin 92 existing in the second flow channel 72 is subsequently injected into the cavity 43 as another part of the single shot of molten resin to later form a core layer 22 of the molded article 20 (see FIG. 6 ).
- a filling behavior of molten resin shown during the injection process that the molten resin almost gushes out from near a thickness center at a tip of a flow thereof.
- Such a filling behavior is called a fountain flow.
- the filling behavior is now described with reference to a schematic diagram.
- a high-temperature resin 91 flows into the cavity 43 in advance.
- a low temperature resin 92 coming thereafter passes through a center portion of the cavity 43 while pushing the precedent high temperature resin 91 .
- the high-temperature resin 91 is then pushed by the low temperature resin 92 and spreads toward an inner surface (i.e. a transfer surface) of the cavity 43 .
- the high temperature resin 91 filled in the cavity 43 forms a skin layer 21 and the low temperature resin 92 filled in the cavity 43 forms a core layer 22 .
- the gate 54 is closed and the resin filled in the cavity 43 is cooled while resin pushed out next time in advance is warmed until a high temperature TH.
- the resin pushed out next time in advance means low temperature resin 92 located in the valve flow channel 65 and the warming flow channel 59 when the injection process is terminated.
- a change in temperature of resin stored in the cavity 43 during a cooling process is described in comparison to a comparative example.
- all of molten resin filled into the cavity has a normal temperature TN.
- a temperature TS ⁇ 1 of the skin layer becomes a takeout allowable temperature TR or less shortly after a time t0.
- the takeout allowable temperature TR is near a melting temperature, at which a molded article is removable from a metal mold, for example.
- a temperature Tc ⁇ 1 of the deepest portion of the core layer becomes the takeout allowable temperature TR or less at a time t2 when a solidification time T1 has elapsed after the time t0.
- a temperature Ts ⁇ 2 of the skin layer becomes the takeout allowable temperature TR or less soon after the time t0.
- an initial value of a temperature Tc ⁇ 2 of the deepest portion of the core layer (of the first embodiment) is set lower than an initial value of a temperature Tc ⁇ 1 of the comparative example, the temperature Tc ⁇ 2 of the deepest portion of the core layer becomes the takeout allowable temperature TR or less at a time t1 when a solidification time T2 shorter than the solidification time T1 has elapsed.
- the cooling process can be more shortened than that that in the comparative example by an amount of time difference (T1 ⁇ T2) between the solidification times T1 and T2.
- T1 ⁇ T2 an amount of time difference between the solidification times T1 and T2.
- the above-described time difference (T1 ⁇ T2) varies depending on a shape of the molded article and a type of resin as used or the like.
- molten resin is successively injected into the cavity 43 of the metal mold 40 from the first flow channel 71 and the second flow channel 72 connected with each other in this order.
- High-temperature resin 91 existing in the first flow channel 71 is injected in advance into the cavity 43 as a part of a single shot of the molten resin to later form the skin layer 21 of the molded article 20 .
- low temperature resin 92 near the flowable limit existing in the second flow channel 72 is subsequently injected into the cavity 43 as another part of the single shot of the molten resin to later form a core layer 22 of the molded article 20 .
- a temperature of molten resin that later forms a core layer of the injection molded article is controlled to be a low level near the flowable limit, a time for solidifying resin after it is injected into the cavity can be reduced. Hence, a molding cycle can be shortened. Further, a temperature of molten resin that later forms a skin layer of the injection-molded article is controlled to be a higher level, generation of an injection molded article having a defective appearance can be suppressed.
- the high temperature resin 91 in the first flow channel 71 is pushed out into the cavity 43 in advance, and subsequently the low temperature resin in the second flow channel 72 is pushed out into the cavity 43 .
- the high temperature resin 91 and the low temperature resin 92 can be injected into the cavity 43 in order by simply injecting the single shot without switching channels and supply sources or the like, the molding cycle can be shortened.
- the manufacturing system includes: a mold closing process of closing a metal mold 40 as a previous process executed prior to an injection process; a cooling process of cooling resin injected into the cavity 43 as a post injection process; and a mold opening process of opening the metal mold 40 and ejecting a molded article 20 after the cooling process is ejected.
- molten resin located in a flow channel just before the cavity 43 i.e., the first flow channel 71
- a high-temperature resin 91 can be prepared in parallel to the existing process.
- a fixed mold 41 of the molding metal mold ( 40 ) includes the high-temperature flow channel section 75 and the low temperature flow channel section 76 .
- the high temperature flow channel section 75 includes the first flow channel 71 located just before the cavity 43 of the metal mold 40 and is enabled to warm the molten resin injected in an early stage as a part of a single shot of molten resin to later form a skin layer 21 of the molded article 20 until the high temperature TH.
- the low temperature flow channel section 76 includes the second flow channel 72 connected to the first flow channel 71 to reserve heat of molten resin injected after the early stage as another part of the single shot of molten resin to later form the core layer 22 of the injection molded article 20 at the low temperature TL near the flowable limit.
- a low temperature TL near the flowable limit is set as a temperature of a molten resin to later form a core layer 22 of a molded article 20 , a solidification time for solidifying resin injected into the cavity can be reduced. As a result, a molding cycle can be shortened. Further, since molten resin to form a skin layer 21 of a molded article 20 is warmed until a relatively high temperature, generation of a molded article 20 having a defective appearance can be suppressed.
- the injection molding machine 10 includes the injection section 32 acting as a supply source of molten resin.
- the molten resin supply source pushes out the high-temperature resin 91 in the first flow channel 71 in advance and the low temperature resin 92 in the second flow channel 72 subsequently to the cavity 43 .
- the high temperature resin 91 and the low temperature resin 92 can be injected into the cavity 43 in order by simply injecting the single shot without switching channels and supply sources or the like, the molding cycle can be shortened.
- the high-temperature flow channel section 75 is enabled to warm the low temperature resin 92 until the high temperature TH within a given period of time calculated by summing up a cooling period of time for cooling the resin filled in the cavity 43 , a period of time for opening the metal mold 40 and ejecting the molded article 20 , and a period of time for closing the metal mold 40 .
- high-temperature resin 91 can be prepared in parallel with an existing operation within an existing operation period of time.
- the low temperature flow channel section 76 includes the heat retention manifold 52 and the high temperature flow channel section 75 includes the warming manifold 53 , high-temperature resin 91 and low temperature resin 92 injected next time into the cavity 43 can be prepared in the hot runner unit 47 .
- the hot runner unit 47 can be preferably placed, for example, in accordance with a layout between the injection section 32 and the molded article 20 , degree of design freedom increases.
- the void 82 is provided between the warming manifold 53 and the heat retention manifold 52 to suppress heat-transfer from the warming manifold 53 to the heat retention manifold 52 . This can maintain a difference in temperature between the high-temperature resin 91 and the low temperature resin 92 .
- the high temperature flow channel section 75 is a sprue 51
- the first flow channel 71 is a sprue flow channel 55
- the low temperature flow channel section 76 is the injection section 32
- the second flow channel 72 is a flow channel formed in the nozzle 33 and the injection section 32 connected to the nozzle 33 .
- Remaining configurations of the second embodiment of the present disclosure are similar to configurations of the first embodiment of the present disclosure, and are accordingly possible to obtain the similar advantages as obtained by the first embodiment of the present disclosure.
- the metal mold 40 can be smaller, thereby downsizing a molding system.
- resin to be pushed out next time in advance can be warmed until a high temperature during either one of the cooling process, the mold opening process, and the mold closing process or all of the processes. Further, in the other embodiment of the present invention, resin to be pushed out next time in advance can be warmed until a high temperature in either one of the cooling period of time, the mold opening period of time, and the mold closing period of time or all of operation periods of time.
- the transmission suppression control section may be composed of a heat insulator or the like.
- the present invention is not limited to the above-described embodiments and can be implemented in various manners not deviating from a point of the present invention.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
- This patent application is based on and claims priority to Japanese Patent Application 2018-169487, filed on Sep. 11, 2018 in the Japan Patent Office, the entire disclosure of which is hereby incorporated by reference herein.
- Embodiments of this disclosure relate to a system of manufacturing an injection molded article and a metal mold.
- In a known manufacturing system of manufacturing an injection-molded article, multiple shots of molten resin are supplied from multiple sources and are sequentially injected into a cavity.
- In recent years, in a process of manufacturing injection molded articles, it is demanded that a molding cycle is further shortened. In this point of view, a known equipment disclosed in the first patent literature has room for improvement, because it cannot sufficiently shorten the molding cycle.
- Various embodiments of the present disclosure have been made in view of the above-discussed problem, and a purpose thereof is to provide a novel system of manufacturing injection-molded articles and a metal mold capable of effectively shortening a molding cycle.
- Accordingly, one aspect of the present disclosure provides a novel system of manufacturing injection molded articles. That is, in a mold injection process of injecting molten resin into a cavity of a metal mold, high temperature molten resin having a given temperature is injected in advance as a part of a single shot of molten resin into a cavity to later form a skin layer of an injection-molded article. Other molten resin having a low temperature near a flowable limit is subsequently injected into the cavity as another part of the single shot of molten resin to later form a core layer of the injection-molded article.
- Another aspect of the present disclosure provides a novel metal mold that includes a flow channel to guide low temperature resin (herein below referred to as a low temperature flow channel section) and a flow channel to warm the low temperature resin (herein below referred to as a high temperature flow channel section). The high temperature flow channel section includes a first flow channel located right before a cavity of a metal mold to warm molten resin injected in an early stage as a part of a single shot of molten resin until a high temperature to later form a skin layer of an injection molded article. The low temperature flow channel section includes a second flow channel connected to the first flow channel to retain heat of molten resin injected after the early stage as another part of the single shot of molten resin at a low temperature near the flowable limit to later form a core layer of the injection molded article.
- According to the above-described manufacturing system and the metal mold, by setting temperature of the molten resin that later forms the core layer of the injection molded article to a low level near the flowable limit, a time for solidifying the molten resin after it is injected into the cavity can be reduced. Hence, a molding cycle can be shortened. Further, by setting temperature of the molten resin that later forms the skin layer of the injection-molded article to a higher level and thereby lowering melt viscosity thereof, generation of an injection molded article having a defective appearance can be suppressed.
- A more complete appreciation of the present disclosure and many of the attendant advantages of the present disclosure will be more readily obtained as substantially the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
-
FIG. 1 is a diagram illustrating an exemplary general view of an injection molding machine with a metal mold structure according to a first embodiment of the present disclosure; -
FIG. 2 is a cross-sectional view illustrating the metal mold of the first embodiment of the present disclosure; -
FIG. 3 is a cross-sectional view illustrating the metal mold of the first embodiment of the present disclosure when molten resin is supplied to a flow channel: -
FIG. 4 is a cross-sectional view illustrating the metal mold of the first embodiment of the present disclosure when a cavity is filled with the molten resin: -
FIG. 5 is a cross-sectional view illustrating the metal mold of the first embodiment of the present disclosure when the molten resin in the cavity is solidified; -
FIG. 6 is a cross-sectional view illustrating the metal mold of the first embodiment of the present disclosure when the metal mold is open: -
FIG. 7 is a diagram schematically illustrating exemplary behavior of molten resin in an initial stage of filling during an injection process: -
FIG. 8 is a diagram schematically illustrating exemplar) behavior of the molten resin in a medium stage of filling during the injection process; -
FIG. 9 is a diagram schematically illustrating exemplary behavior of the molten resin during the injection process when the molten resin is completely filled; -
FIG. 10 is a diagram schematically illustrating an exemplary change in temperature of the resin in the cavity during the cooling process; and -
FIG. 11 is a cross-sectional view illustrating a metal mold of a second embodiment of the present disclosure. - Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views thereof, and in particular to
FIG. 1 , aninjection molding machine 10 is provided to manufacture a molded article by performing injection molding. The injection molding is a system to obtain a molded article (i.e., an injection molded article) by injecting molten material into ametal mold 40 and cooling and solidifying the molten material. - The
injection molding machine 10 includes amold fastening section 31 and aninjection section 32. Theinjection section 32 heats and melts resin material and injects a melting result into themetal mold 40. (Hence) Theinjection section 32 includes a molten resin supply source. Theinjection section 32 controls injection speed when resin flows thru themetal mold 40 and controls pressure when themetal mold 40 has been filled with the resin. Themold fastening section 31 opens and closes themetal mold 40 and removes the molded article therefrom or the like. Themetal mold 40 includes a fixedmold 41 and amovable mold 42 and is installed in themold fastening section 31. - As illustrated in
FIG. 2 , acavity 43 is formed between the fixed andmovable molds cavity 43 becomes a molded article when it is solidified therein. Themovable mold 42 is disposed to be able to approach and separate from the fixedmold 41. Thus, themetal mold 40 can be opened when themovable mold 42 is separated from thefixed mold 41 and closed when themovable mold 42 approaches thefixed mold 41. InFIG. 2 , themetal mold 40 is in a closed state. - The fixed
mold 41 includes amounting plate 44 located on a side of theinjection section 32, aplate 45 to form acavity 43 between itself and themovable mold 42, and aspacer block 46 sandwiched between themounting plate 44 and theplate 45. The fixedmold 41 also includes ahot runner unit 47 mounting over themounting plate 44 to theplate 45. These devices other than thehot runner unit 47 can adopt other known suitable configurations. - The
hot runner unit 47 constitutes a flow channel ranging from anozzle 33 of theinjection section 32 to thecavity 43 to keep molten resin melted therein. In this embodiment of the present disclosure, thehot runner unit 47 includes asprue 51, aheat retention manifold 52, and awarming manifold 53. Thehot runner unit 47 also includes agate 54. - The
sprue 51 is attached to themounting plate 44 and is connected to thenozzle 33. Thesprue 51 includes asprue flow channel 55. Asprue heater 56 is provided in thesprue 51. Theheat retention manifold 52 is located between themounting plate 44 and theplate 45 and is connected to thesprue 51. Theheat retention manifold 52 includes a heatretention flow channel 57. Theheat retention manifold 52 includes aheat retention heater 58. - Molten resin injected from the
injection section 32 has a low temperature TL. Herein below, molten resin having has a low temperature TL is referred to aslow temperature resin 92. Thesprue heater 56 and theheat retention heater 58 are set to the low temperature TL or similar temperature. Hence, thesprue 51 and theheat retention manifold 52 keep thelow temperature resin 92 injected from theinjection section 32 warm at the low temperature TL. The low temperature TL is near a flowable limit temperature and is lower than a temperature TN of molten resin injected into the cavity when an ordinary injection molding operation is performed (herein below, referred to as a normal temperature TN). - The
warming manifold 53 is located between themounting plate 44 and theplate 45 and is connected to theheat retention manifold 52. Thewarming manifold 53 includes awarming flow channel 59. The warmingmanifold 53 is provided with a warmingheater 61. Thegate 54 is a valve gate and includes avalve body 62 disposed on theplate 45, avalve pin 63, and adriving section 64 to drive thevalve pin 63. Thevalve body 62 is connected to the warmingmanifold 53 and includes avalve flow channel 65. Thevalve pin 63 is enabled to open and close a connection hole connecting thevalve flow channel 65 with thecavity 43. Thevalve body 62 is provided with avalve heater 66. - Each of the warming
heater 61 and thevalve heater 66 is set to a high temperature TH higher than the low temperature TL. The warmingheater 61 and thevalve heater 66 warm molten resin remaining in thewarming flow channel 59 and thevalve flow channel 65 until the high temperature TH. The high temperature TH is usually higher than an ordinary molding temperature TN, and is lower than either a resin color change temperature or a resin decomposition temperature. Herein below, molten resin warmed until the high temperature TH is referred to as high-temperature resin 91. InFIG. 3 and following drawings, to distinguish the high-temperature resin 91 and thelow temperature resin 92 from each other, a hatching pattern therefor is differentiated. However, the high-temperature resin 91 and thelow temperature resin 92 are basically the same resin with each other. - The
warming flow channel 59 and thevalve flow channel 65 collectively constitute afirst flow channel 71 located just before thecavity 43. The warmingmanifold 53 and thegate 54 collectively constitute a high temperatureflow channel section 75. As illustrated inFIG. 3 , the high temperatureflow channel section 75 is enabled to warm molten resin injected in an early stage as a part of a single shot of molten resin to later form a skin layer (i.e. a surface layer section) of a molded article until the high temperature TH. Here, a capacity of high-temperature resin 91 is desirably equal to or more than a product obtained by calculating the below described formula: -
Capacity of Single shot×6/Maximum Thickness×Thickness of Skin Layer. - Here, since it varies depending on a type of resin, temperature and a time for filing thereof, the thickness of the skin layer is set accordingly.
- The
sprue flow channel 55 and the heatretention flow channel 57 collectively constitute asecond flow channel 72 connected to thefirst flow channel 71. Thesprue 51 and theheat retention manifold 52 collectively constitute a low temperatureflow channel section 76. The low temperatureflow channel section 76 is partially enabled to retain heat of molten resin injected after the early stage as another part of the single shot of molten resin to later form a core layer (i.e. an interior) of the molded article at the low temperature TL. - As illustrated in
FIGS. 3 and 4 , by pumping out a single shot of molten resin from thenozzle 33 to thesecond flow channel 72 and thefirst flow channel 71 in order, the injection section 32 (seeFIG. 1 ) pushes out a high-temperature resin 91 in thefirst flow channel 71 to thecavity 43 in advance, and subsequently pushes out alow temperature resin 92 in thesecond flow channel 72 to thecavity 43. As illustrated inFIG. 5 , the resin is filled and solidified in thecavity 43 thereby becoming a moldedarticle 20. - The high-temperature
flow channel section 75 is enabled to warm thelow temperature resin 92 until the high temperature TH within a given period of time calculated by summing up a cooling period of time for cooling and solidifying the resin as illustrated inFIG. 5 after thecavity 43 is filled with resin as illustrated inFIG. 4 , a mold opening period of time for opening themetal mold 40 and ejecting the moldedarticle 20 as illustrated inFIG. 6 , and a metal mold closing period of time for closing themetal mold 40 as illustrated inFIG. 3 . In this embodiment of the present disclosure, thelow temperature resin 92 is warmed until the high temperature TH within the total of the cooling period of time and the mold opening period of time, for example. - The warming
manifold 53 is connected to theheat retention manifold 52 through aconnection section 81. Between the warmingmanifold 53 and theheat retention manifold 52, a void 82 is provided excluding a position of theconnection section 81. The void 82 suppresses heat transfer between the warmingmanifold 53 and theheat retention manifold 52. In other words, the void 82 acts as a heat-transfer suppression section. - Now, a system of manufacturing a molded article by using an
injection molding machine 10 is described. Theinjection molding machine 10 manufactures a molded article by repeating the following first to fourth processes. A cycle of molding molded articles with the manufacturing system starts when the first process starts and ends when the fourth process is completed. - First, a metal mold closing process is described. As illustrated in
FIG. 3 , themetal mold 40 is closed in a metal mold closing process. It is supposed that when the mold closing process starts, thelow temperature resin 92 remaining in thesecond flow channel 72 and thehigh temperature resin 91 remaining in thefirst flow channel 71 during the last molding cycle exist as are. - Secondly, in an injection process, as illustrated in
FIG. 4 , molten resin is successively injected from thefirst flow channel 71 andsecond flow channel 72 connected with each other in order into thecavity 43. At this moment, high-temperature resin 91 existing in thefirst flow channel 71 is injected into thecavity 43 in advance as a part of a single shot of molten resin to later form askin layer 21 of a molded article 20 (seeFIG. 6 ). Further,low temperature resin 92 existing in thesecond flow channel 72 is subsequently injected into thecavity 43 as another part of the single shot of molten resin to later form acore layer 22 of the molded article 20 (seeFIG. 6 ). - In the injection process, since a single shot of molten resin is fed from the
nozzle 33 to thesecond flow channel 72 and thefirst flow channel 71 in this order, the high-temperature resin 91 in thefirst flow channel 71 is pushed out in advance to thecavity 43, and thelow temperature resin 92 in thesecond flow channel 72 pushed out to thecavity 43 thereafter. In other words, in the injection process, thehigh temperature resin 91 located in the heatretention flow channel 57 and thesprue flow channel 55, and thelow temperature resin 92 located in thevalve flow channel 65 and thewarming flow channel 59 are almost pushed by thelow temperature resin 92 emitted from thenozzle 33 thereby being filled into thecavity 43 in this order. - It is known as a filling behavior of molten resin shown during the injection process that the molten resin almost gushes out from near a thickness center at a tip of a flow thereof. Such a filling behavior is called a fountain flow. The filling behavior is now described with reference to a schematic diagram. First, as illustrated in
FIG. 7 , a high-temperature resin 91 flows into thecavity 43 in advance. Then, as illustrated inFIG. 8 , alow temperature resin 92 coming thereafter passes through a center portion of thecavity 43 while pushing the precedenthigh temperature resin 91. The high-temperature resin 91 is then pushed by thelow temperature resin 92 and spreads toward an inner surface (i.e. a transfer surface) of thecavity 43. In the end, as illustrated inFIG. 9 , thehigh temperature resin 91 filled in thecavity 43 forms askin layer 21 and thelow temperature resin 92 filled in thecavity 43 forms acore layer 22. - Now, an exemplary cooling process executed while warming resin shot next time until high-temperature is described herein below. As illustrated in
FIG. 5 , in the cooling process, thegate 54 is closed and the resin filled in thecavity 43 is cooled while resin pushed out next time in advance is warmed until a high temperature TH. Here, the resin pushed out next time in advance meanslow temperature resin 92 located in thevalve flow channel 65 and thewarming flow channel 59 when the injection process is terminated. - Now, a change in temperature of resin stored in the
cavity 43 during a cooling process is described in comparison to a comparative example. In the comparative exam, all of molten resin filled into the cavity has a normal temperature TN. As illustrated inFIG. 10 , in the comparative example, a temperature TS−1 of the skin layer becomes a takeout allowable temperature TR or less shortly after a time t0. The takeout allowable temperature TR is near a melting temperature, at which a molded article is removable from a metal mold, for example. Further, a temperature Tc−1 of the deepest portion of the core layer becomes the takeout allowable temperature TR or less at a time t2 when a solidification time T1 has elapsed after the time t0. - By contrast, according to the first embodiment of the present disclosure, a temperature Ts−2 of the skin layer becomes the takeout allowable temperature TR or less soon after the time t0. Further, since an initial value of a temperature Tc−2 of the deepest portion of the core layer (of the first embodiment) is set lower than an initial value of a temperature Tc−1 of the comparative example, the temperature Tc−2 of the deepest portion of the core layer becomes the takeout allowable temperature TR or less at a time t1 when a solidification time T2 shorter than the solidification time T1 has elapsed. Hence, in the first embodiment of the present disclosure, the cooling process can be more shortened than that that in the comparative example by an amount of time difference (T1−T2) between the solidification times T1 and T2. The above-described time difference (T1−T2) varies depending on a shape of the molded article and a type of resin as used or the like.
- Now, an exemplary mold opening process executed while warming resin until high-temperature for the next shot is described. In the mold opening process, as illustrated in
FIG. 6 , themetal mold 40 is opened and a moldedarticle 20 is ejected. In this process, resin to be pushed out next time in advance is successively warmed until a high temperature TH. - As described heretofore, according to the first implementation of the present disclosure, during the injection process, molten resin is successively injected into the
cavity 43 of themetal mold 40 from thefirst flow channel 71 and thesecond flow channel 72 connected with each other in this order. High-temperature resin 91 existing in thefirst flow channel 71 is injected in advance into thecavity 43 as a part of a single shot of the molten resin to later form theskin layer 21 of the moldedarticle 20. Further,low temperature resin 92 near the flowable limit existing in thesecond flow channel 72 is subsequently injected into thecavity 43 as another part of the single shot of the molten resin to later form acore layer 22 of the moldedarticle 20. - According to the manufacturing system, since a temperature of molten resin that later forms a core layer of the injection molded article is controlled to be a low level near the flowable limit, a time for solidifying resin after it is injected into the cavity can be reduced. Hence, a molding cycle can be shortened. Further, a temperature of molten resin that later forms a skin layer of the injection-molded article is controlled to be a higher level, generation of an injection molded article having a defective appearance can be suppressed.
- Further, according to the first embodiment of the present disclosure, by sending single shot of the molten resin from the
injection section 32 to thesecond flow channel 72 and thefirst flow channel 71 in this order in the injection process, thehigh temperature resin 91 in thefirst flow channel 71 is pushed out into thecavity 43 in advance, and subsequently the low temperature resin in thesecond flow channel 72 is pushed out into thecavity 43. Thus, since thehigh temperature resin 91 and thelow temperature resin 92 can be injected into thecavity 43 in order by simply injecting the single shot without switching channels and supply sources or the like, the molding cycle can be shortened. - Further, according to the first embodiment of the present disclosure, the manufacturing system includes: a mold closing process of closing a
metal mold 40 as a previous process executed prior to an injection process; a cooling process of cooling resin injected into thecavity 43 as a post injection process; and a mold opening process of opening themetal mold 40 and ejecting a moldedarticle 20 after the cooling process is ejected. In the cooling process and the mold opening process, molten resin located in a flow channel just before thecavity 43, i.e., thefirst flow channel 71, is warmed until a high temperature TH. As a result, without additionally imposing a process of warming the resin to be injected into thecavity 43 next time in advance until the hot temperature TH, a high-temperature resin 91 can be prepared in parallel to the existing process. - Further, according to the first embodiment of the present disclosure, a fixed
mold 41 of the molding metal mold (40) includes the high-temperatureflow channel section 75 and the low temperatureflow channel section 76. The high temperatureflow channel section 75 includes thefirst flow channel 71 located just before thecavity 43 of themetal mold 40 and is enabled to warm the molten resin injected in an early stage as a part of a single shot of molten resin to later form askin layer 21 of the moldedarticle 20 until the high temperature TH. The low temperatureflow channel section 76 includes thesecond flow channel 72 connected to thefirst flow channel 71 to reserve heat of molten resin injected after the early stage as another part of the single shot of molten resin to later form thecore layer 22 of the injection moldedarticle 20 at the low temperature TL near the flowable limit. - According to the
injection molding machine 10, since a low temperature TL near the flowable limit is set as a temperature of a molten resin to later form acore layer 22 of a moldedarticle 20, a solidification time for solidifying resin injected into the cavity can be reduced. As a result, a molding cycle can be shortened. Further, since molten resin to form askin layer 21 of a moldedarticle 20 is warmed until a relatively high temperature, generation of a moldedarticle 20 having a defective appearance can be suppressed. - Further, according to the first embodiment of the present disclosure, the
injection molding machine 10 includes theinjection section 32 acting as a supply source of molten resin. By sending a single shot of molten resin to thesecond flow channel 72 and thefirst flow channel 71 in order, the molten resin supply source pushes out the high-temperature resin 91 in thefirst flow channel 71 in advance and thelow temperature resin 92 in thesecond flow channel 72 subsequently to thecavity 43. Thus, since thehigh temperature resin 91 and thelow temperature resin 92 can be injected into thecavity 43 in order by simply injecting the single shot without switching channels and supply sources or the like, the molding cycle can be shortened. - Further, according to the first embodiment of the present disclosure, the high-temperature
flow channel section 75 is enabled to warm thelow temperature resin 92 until the high temperature TH within a given period of time calculated by summing up a cooling period of time for cooling the resin filled in thecavity 43, a period of time for opening themetal mold 40 and ejecting the moldedarticle 20, and a period of time for closing themetal mold 40. Hence, even if a waiting time for warming resin injected next time into thecavity 43 in advance until a high temperature TH is not employed, high-temperature resin 91 can be prepared in parallel with an existing operation within an existing operation period of time. - Further, according to the first embodiment of the present disclosure, since the low temperature
flow channel section 76 includes theheat retention manifold 52 and the high temperatureflow channel section 75 includes the warmingmanifold 53, high-temperature resin 91 andlow temperature resin 92 injected next time into thecavity 43 can be prepared in thehot runner unit 47. Further, since thehot runner unit 47 can be preferably placed, for example, in accordance with a layout between theinjection section 32 and the moldedarticle 20, degree of design freedom increases. - Further, according to the first embodiment of the present disclosure, the void 82 is provided between the warming
manifold 53 and theheat retention manifold 52 to suppress heat-transfer from the warmingmanifold 53 to theheat retention manifold 52. This can maintain a difference in temperature between the high-temperature resin 91 and thelow temperature resin 92. - Now, a second embodiment of the present disclosure is described. In a second embodiment of the present disclosure, as illustrated in
FIG. 11 , the high temperatureflow channel section 75 is asprue 51, and thefirst flow channel 71 is asprue flow channel 55. The low temperatureflow channel section 76 is theinjection section 32, and thesecond flow channel 72 is a flow channel formed in thenozzle 33 and theinjection section 32 connected to thenozzle 33. Remaining configurations of the second embodiment of the present disclosure are similar to configurations of the first embodiment of the present disclosure, and are accordingly possible to obtain the similar advantages as obtained by the first embodiment of the present disclosure. Further, according to the second embodiment of the present disclosure, themetal mold 40 can be smaller, thereby downsizing a molding system. - Another embodiment is herein below described. As a yet another embodiment of the present disclosure, resin to be pushed out next time in advance can be warmed until a high temperature during either one of the cooling process, the mold opening process, and the mold closing process or all of the processes. Further, in the other embodiment of the present invention, resin to be pushed out next time in advance can be warmed until a high temperature in either one of the cooling period of time, the mold opening period of time, and the mold closing period of time or all of operation periods of time.
- According to yet another embodiment of the present inventions, since the present invention is not limited to the void, the transmission suppression control section may be composed of a heat insulator or the like.
- The present invention is not limited to the above-described embodiments and can be implemented in various manners not deviating from a point of the present invention.
- Numerous additional modifications and variations of the present disclosure are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the present disclosure may be executed otherwise than as specifically described herein. For example, the system of manufacturing an injection-molded article is not limited to the above-described various embodiments and may be altered as appropriate. Similarly, the mold is not limited to the above-described various embodiments and may be altered as appropriate.
Claims (9)
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US17/901,927 US11931936B2 (en) | 2018-09-11 | 2022-09-02 | System of manufacturing injection molded article and metal mold |
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JP2018169487A JP7091958B2 (en) | 2018-09-11 | 2018-09-11 | Manufacturing method of injection molded products |
JP2018-169487 | 2018-09-11 |
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US17/901,927 Division US11931936B2 (en) | 2018-09-11 | 2022-09-02 | System of manufacturing injection molded article and metal mold |
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US20220355520A1 (en) * | 2021-05-07 | 2022-11-10 | The Gillette Company Llc | Method and system for molding an article |
US11931936B2 (en) | 2018-09-11 | 2024-03-19 | Denso Corporation | System of manufacturing injection molded article and metal mold |
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US3026567A (en) * | 1958-11-10 | 1962-03-27 | Phillips Petroleum Co | Apparatus for injection molding of plastic materials |
US3103039A (en) * | 1959-07-23 | 1963-09-10 | William H Robinson | Molding apparatus |
US4031176A (en) * | 1971-05-03 | 1977-06-21 | The General Tire & Rubber Company | Method of injection molding expanded thermoplastics and articles produced thereby |
US4108956A (en) * | 1977-01-21 | 1978-08-22 | Owens-Illinois, Inc. | Injection molding method and apparatus |
US4451224A (en) * | 1982-03-25 | 1984-05-29 | General Electric Company | Mold device for making plastic articles from resin |
JPH06328509A (en) * | 1993-05-21 | 1994-11-29 | Toyota Motor Corp | Production of sandwichlike molding |
JP3017052B2 (en) * | 1995-08-10 | 2000-03-06 | 東京大学長 | Multilayer molding method and apparatus |
US6264460B1 (en) | 1999-12-09 | 2001-07-24 | Pechiney Emballage Flexible Europe | Injection gate insulating and cooling apparatus |
US20030096364A1 (en) * | 2000-09-05 | 2003-05-22 | Genentech, Inc. | Secreted and transmembrane polypeptides and nucleic acids encoding the same |
JP2003340879A (en) | 2002-05-28 | 2003-12-02 | Toshiba Mach Co Ltd | Hot runner die for sandwich molding |
AU2006277289A1 (en) * | 2005-08-09 | 2007-02-15 | Daiichi Sankyo Company, Limited | Novel cercosporamide derivative |
US20070096364A1 (en) | 2005-11-03 | 2007-05-03 | Mgs Mfg. Group, Inc. | Sandwich molding system with independent runner passages |
US7390184B2 (en) * | 2005-11-09 | 2008-06-24 | Centoco Plastics Limited | Dual injection manifold |
JP4784948B2 (en) | 2006-03-03 | 2011-10-05 | モルド−イノ カンパニー リミテッド | Non-contact high frequency induction heating device for plastic injection nozzle |
WO2007149021A1 (en) | 2006-06-21 | 2007-12-27 | Flexiject Co-Injection Ab | Method for injection moulding of products in thermoplast with stepwise opening of different parts of the mould cavity, and tool for practizing the method |
US20080093772A1 (en) | 2006-10-06 | 2008-04-24 | Graham Packing Company, Lp | Method and apparatus for delivering sequential shots to multiple cavities to form multilayer articles |
US20080088047A1 (en) | 2006-10-12 | 2008-04-17 | Mold-Masters Limited | Apparatus and method for a hot runner injection molding system |
JP5657482B2 (en) | 2011-06-24 | 2015-01-21 | 本田技研工業株式会社 | Injection molding method and apparatus |
WO2012176900A1 (en) | 2011-06-24 | 2012-12-27 | 本田技研工業株式会社 | Injection moulding method and device therefor |
RU2537096C2 (en) | 2013-01-28 | 2014-12-27 | Открытое Акционерное Общество "Автоштамп" | Thermoelectric module (versions) |
JP7091958B2 (en) | 2018-09-11 | 2022-06-28 | 株式会社デンソー | Manufacturing method of injection molded products |
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- 2018-09-11 JP JP2018169487A patent/JP7091958B2/en active Active
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US11931936B2 (en) | 2018-09-11 | 2024-03-19 | Denso Corporation | System of manufacturing injection molded article and metal mold |
US20220355520A1 (en) * | 2021-05-07 | 2022-11-10 | The Gillette Company Llc | Method and system for molding an article |
US11931937B2 (en) * | 2021-05-07 | 2024-03-19 | The Gillette Company Llc | Method and system for molding an article |
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JP7091958B2 (en) | 2022-06-28 |
DE102019122272A1 (en) | 2020-03-12 |
US11931936B2 (en) | 2024-03-19 |
CN110884064B (en) | 2023-02-03 |
CN110884064A (en) | 2020-03-17 |
US20220410453A1 (en) | 2022-12-29 |
JP2020040293A (en) | 2020-03-19 |
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