WO2006062016A1 - 中空成形品の製造方法 - Google Patents
中空成形品の製造方法 Download PDFInfo
- Publication number
- WO2006062016A1 WO2006062016A1 PCT/JP2005/021975 JP2005021975W WO2006062016A1 WO 2006062016 A1 WO2006062016 A1 WO 2006062016A1 JP 2005021975 W JP2005021975 W JP 2005021975W WO 2006062016 A1 WO2006062016 A1 WO 2006062016A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- injection
- molten resin
- pressure
- gas
- pressurized fluid
- Prior art date
Links
Classifications
-
- 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
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76551—Time
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76822—Phase or stage of control
- B29C2945/76859—Injection
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76822—Phase or stage of control
- B29C2945/76862—Holding, dwelling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0063—Density
Definitions
- the present invention relates to a method for producing a resin molded product (hollow molded product) having a hollow portion inside by a gas assist molding method.
- the gas assist molding method is a resin molding in which a molten fluid is filled in a mold cavity, a pressurized fluid such as a gas or liquid is injected into the molten resin, and a hollow portion is formed inside.
- a method of manufacturing a product for example, see Patent Document 1).
- a device for carrying out this gas assist molding method is commercially available, and generally a high pressure gas supply device for supplying a pressurized fluid is provided in the vicinity of the injection molding device. (For example, see Patent Document 2).
- Patent Document 1 Japanese Patent Publication No. 48-041264
- Patent Document 2 Japanese Patent Laid-Open No. 2002-028960
- Patent Document 3 Japanese Patent Laid-Open No. 08-197561
- the injection time (T1) is generally determined by the injection speed and the injection pressure, in the case of a control method in which the filling time ( ⁇ ) is constant, if the injection speed changes for some reason, The injection time (T1) fluctuates, and as a result, the pressure holding time ( ⁇ 2) fluctuates.
- injection molding due to variations in fluidity between lots of molten resin, effects of room temperature, etc.
- the holding time (T2) will become shorter by ⁇ and the injection time (T1) When ⁇ ⁇ becomes shorter, the pressure holding time (T2) becomes longer ⁇ .
- the pressure, viscosity and weight of the molten resin filled in the mold cavity vary from shot to shot.
- the molten resin filled in the mold cavity is filled with a pressurized fluid, and therefore, the molten powder filled in the mold cavity is filled.
- the relationship between the pressure of the fat and the pressure of the pressurized fluid injected into the molten resin is important. This is because the pressure of the pressurized fluid is constant, so that the injection amount of the pressurized fluid decreases when the pressure of the molten resin is high, and the injection amount of the pressurized fluid increases when the pressure of the molten resin is low. .
- the present invention has been made to solve such a problem, and provides a method for producing a hollow molded article in which the hollow ratio is substantially constant and defects such as warpage, deformation, swelling, and burst are eliminated. It is something to offer.
- the method for producing a hollow molded article according to claim 1 is characterized in that the molten resin is injected into the mold cavity by controlling the injection time to be constant, and the density of the molten resin is controlled by controlling the holding time to be constant. After injecting the pressurized fluid into the molten resin, the injected pressurized fluid is discharged while the molten resin is being cooled, so that the hollow ratio of the hollow molded product is made substantially constant, and warping, deformation, etc. Molding defects can be eliminated.
- the molten resin is injected into the mold cavity by controlling the injection time constant, and the density of the molten resin is controlled by controlling the holding pressure constant. After injecting the pressurized fluid into the molten resin, the injected pressurized fluid is cooled while cooling the molten resin. Since it is discharged, the hollow ratio of the hollow molded product can be made substantially constant, and molding defects such as warpage and deformation can be eliminated.
- the method for producing a hollow molded article according to claim 3 is the method according to claim 1 or 2, wherein the injection speed and the injection pressure are controlled in multiple stages when the molten resin is injected into the mold cavity.
- the hollow ratio is made substantially constant, and molding defects such as warpage and deformation are eliminated.
- the present invention has an effect that various molding defects occurring in a hollow molded product can be eliminated by making the pressure of the molten resin in the mold cavity which is not affected by disturbance substantially constant. .
- a plate (thickness: 2mm), width: 100mm, length: 450mm, height H: 3mm, width T: lmm, length Hollow molded product 1 with 450mm rib 2 was molded by gas assist molding method using transparent ABS ⁇ Toyolac 920 (trade name) ⁇ .
- the gate was provided at the inlet 3 and nitrogen gas as a pressurized fluid was injected from the inlet 3
- Molding conditions are as follows: molten resin is injected into the mold cavity at a speed setting of 70% of the maximum injection speed and a pressure setting of 65% of the maximum injection pressure, and 0% at a pressure setting of 40% of the maximum injection pressure.
- the molten resin in the mold cavity was held at the set value for 5 seconds.
- nitrogen gas was injected into the molten resin at lOMPa for 5 seconds, gas holding pressure was applied for 5 seconds, and nitrogen gas was discharged to the atmosphere from a gap between gas injection pins (not shown). .
- the mold was opened, the hollow molded product 1 was taken out from the mold cavity, and the length L where the hollow portion 4 was formed was measured.
- the length L is the maximum length that the nitrogen gas has advanced along the rib 2 from one end of the hollow molded article 1 having the inlet 3.
- This hollow molded article 1 is filled with a case where an apparatus (for example, an injection molding apparatus manufactured by Meiki Seisakusho) that can control the injection time T1 and the pressure holding time T2 independently by a timer is used.
- An apparatus for example, an injection molding apparatus manufactured by Meiki Seisakusho
- the fact that the injection time T1 and the pressure holding time ⁇ 2 can be controlled independently by a timer means that the elapsed time of the injection start force of the molten resin is monitored by the timer, and when the injection time reaches T1, Stopping resin injection and monitoring the elapsed time from the start of pressure holding of the molten resin with a timer, and stopping pressure holding of the molten resin when the pressure holding time reaches ⁇ 2.
- the fact that the filling time ⁇ ⁇ ⁇ ⁇ can be controlled by a timer means that the injection time T1 and the pressure holding time ⁇ 2 are not monitored individually by the timer, but the total filling time ⁇ is monitored by the timer, that is, the molten resin The time elapsed after the injection start force is monitored with a timer, and the holding pressure of the molten resin is stopped when the filling time reaches ⁇ .
- the molding product shown in Fig. 1 and Fig. 2 described in Example 1 was molded by the gas assist molding method.
- the molding conditions were a speed setting of 70% of the maximum injection speed and a pressure setting of 65% of the maximum injection pressure.
- the molten resin was injected into the mold cavity with the pressure of 40% of the maximum injection pressure, and the molten resin in the mold cavity was held at the set value for 2 seconds.
- nitrogen gas was injected into the molten resin at a pressure of lOMPa for 5 seconds, and the gas holding pressure was maintained for 10 seconds! Nitrogen gas was discharged into the atmosphere through the gap between the injection pins. Then, the mold was opened, the hollow molded product 1 was taken out from the mold cavity, and the length L that the hollow portion 4 was formed was measured.
- the thickness (top meat) is 2.5 mm
- the length is 100 mm
- the height is 100 mm
- the part 11 the length 50 mm
- ABS ⁇ Toyolac 920 (trade name) ⁇ it was molded by the gas assist molding method.
- the gate was provided at the gate port 10, and nitrogen gas as a pressurized fluid was injected from the injection port 15.
- an injection molding apparatus for example, an injection speed and an injection pressure can be set independently in multiple stages and an injection time T1 and a pressure holding time T2 can be controlled independently
- Molding conditions are as follows: Member 11 (A point force is also up to B point), injection speed is 70% of maximum injection speed, injection pressure is 65% of maximum injection pressure, and member 12 (from B point to C point) ), The injection speed is 20% of the maximum injection speed, the injection pressure is 20% of the maximum injection pressure, and the injection speed of member 13 (C point force up to D point) is 70% of the maximum injection speed.
- the pressure was maintained for 4 seconds at 40% of the maximum injection pressure. After completion of primary pressure (after completion of injection, that is, after completion of injection time T1) 0.
- the hollow molded product 16 shown in FIG. 3 can be controlled independently of the injection time T1 and the holding time T2, and the injection speed is variable, but the injection pressure is one pressure (die Cavity
- the injection molding device for example, an injection molding device manufactured by Sumitomo Heavy Industries) that is the maximum pressure setting and the pressure follows according to the injection speed
- the molding conditions are as follows: member 11 (point A force is also up to point B), the injection speed is 70% of the maximum injection speed, and member 12 (point B to point C) is the injection speed of the maximum injection speed.
- the injection speed was set at a maximum injection speed of 70%.
- the injection pressure is the maximum injection after injecting molten resin into the mold cavity at an injection speed of 20% of the maximum injection speed in order to prevent burrs from being stretched when passing through point B and point C.
- the pressure was maintained for 4 seconds at 40% of the pressure for 0.5 seconds. After completion of primary pressure (after completion of injection, that is, after completion of injection time T1) 0.
- a melt shutter may be provided on a mold cavity for molding a hollow molded product.
- the melt shutter is a shutter provided in a passage that connects the mold cavity (the shape of the dust) provided close to the mold cavity and the mold cavity.
- melt shutter closed With the melt shutter closed, the molten resin is injected into the mold cavity, the resin pressure is retained, the mold cavity surface is transferred to the molten resin, the melt shutter is opened, and the molten resin is opened.
- nitrogen gas is injected into the fat, excess molten resin (melt) moves to the resin pool through the internal force passage of the molten resin according to the formation of the hollow part inside the molten resin.
- the melt shutter is operated by operating a pin with a hydraulic or pneumatic cylinder so that the shirt is applied to the pin. It can have one function.
- the mold cavity and the grease reservoir can be opened and closed by a forward and backward movement of the pin by a hydraulic cylinder. It is desirable to close the melt shutter during the gas holding pressure of nitrogen gas or during the air discharge.
- the thickness of the rib is desirably 70% or less of the thickness of the top meat at the root. This is because, if the rib thickness exceeds 70% of the thickness of the top meat, rib transfer spots appear on the appearance of the hollow molded product. However, if the rib thickness must be 70% or more of the thickness of the carcass due to the design of the molded product, a sufficient grease holding pressure before injecting nitrogen gas can be obtained by using a melt shutter. As a result, the transfer rate of the mold cavity surface is increased, so that a relatively beautiful hollow molded product can be obtained.
- the hollow ratio of the hollow molded product it is desirable to match the volume of the resin molded product with the volume of the resin pool. In this case, it is desirable to use a mechanism that can change the volume of the resin reservoir.
- the capacity of the resin reservoir is preferably filled with the melt by injecting nitrogen gas. desirable.
- the pressurized fluid when the pressurized fluid is injected directly into the molten resin, the void ratio tends to increase in the vicinity of the gate, and the dimensional accuracy tends to improve in a place away from the gate.
- a gas injection mechanism in the flow path of the molten resin.
- octopus-one dollar When a primary sprue cold struggle or a special gas injection shape is used for gas injection (referred to as “octopus-one dollar”), injection pressure is applied to the gas injection pin, and pressurized fluid is injected. Difficulty in injection pressure or time. As a result, problems such as variations in the hollow ratio of the hollow molded product occur, which is not preferable.
- inert gas for example, nitrogen gas, carbon dioxide gas, etc.
- inert gas for example, nitrogen gas, carbon dioxide gas, etc.
- an inert gas having a cold struggle or runner lock pin force is injected during injection.
- the gas injection pin used in the gas assist molding is such that nitrogen gas or the like as a pressurized fluid is input and output from a gap of about 0.03 mm provided in the gas injection pin.
- the molten resin in contact with the tip of the gas must be melted during gas injection (gas “in”), and must be completely cooled and solidified when gas is released (gas “out”). It is important. This is because if the mold is opened while the gas circuit is blocked, that is, with the residual pressure remaining in the hollow portion, defective products such as blisters and bursts will result. In order to prevent this, it is preferable to surround the molten resin with a thickness of about 0.5 mm to about Lmm around the tip of the gas injection pin. Is not preferred.
- Gas-assisted molding reduces the cooling time because the thick part, which takes time to cool and solidify, becomes hollow, so that the cooling time is shortened. It is desirable to cool the injection pin to sufficiently cool and solidify the molten resin in the gas discharge circuit portion. This can be achieved by blowing air to the rear of the gas injection pin and cooling it.
- the material of the gas injection pin may be steel, but it has good thermal conductivity, and it is preferable to use linseed copper or beryllium copper. Alternatively, Ni may be applied to silver and manufactured by machining.
- the pressure of the molten resin in the mold cavity increases, so the pressure of the pressurized fluid injected into the molten resin must be high.
- the pressure of the molten resin in the mold cavity is lower than that in the case of a single-point gate, so the pressure of the pressurized fluid injected into the molten resin can be reduced. .
- the injection molding apparatus capable of controlling the holding time T2 is used when the molten resin in the mold cavity is made high by the holding time T2 and the injection pressure (the injection pressure is increased to extend the holding time T2. ), And when the pressure is low (when the injection pressure is reduced by shortening the holding time T2), the pressure of the molten resin in the mold cavity is increased before the caloric pressure fluid is supplied. It is possible to control the appearance and the hollow ratio of the hollow molded article by injecting or injecting a pressurized fluid with the pressure of the molten resin in the mold cavity low.
- the gas injection pin When the gas injection pin is installed in a part surrounded by grease, for example, where it is good to install in a place where the cooling is performed smoothly, for example, in a place surrounded by a square with high ribs, the gas injection pin Does not cool down, causing blisters and bursts.
- the resin that can be used in the present invention includes ABS, HIPS, and other styrenes, PE, PP, and other olefins, vinyl chloride and other vinyls, polyamides, amides, polyesters, ester, and ethers. All of the thermoplastic resin represented by fats, all of thermosetting resin represented by urea and phenol, polymer blends and polymer alloys of the resins, and inorganic and Z or organic fiber It is expected that the application can be expanded to injection molding of composite materials containing minerals and flame retardants, as well as aluminum and magnesium, and alloys based on them.
- the injection molding method to which the present invention can be applied is effective for general injection molding (solid injection molding method), in particular, AGI, GPI, CGM, H 2 M of Asahi Kasei Kogyo, GIM of Idemitsu Petrochemical, Nippon Steel Chemical PFP, British thin press, US GAIN Technology, Germany's Air Monoredo, hollow injection (gas assist) molding method represented by Contool, and UCC method, USM method, or Toshiba machine Using TAF method developed by Asahi Dow, EX—CELL—O method, Hettinger's foam molding, New—SF, GCP method, Allied Chemical's technique, and supercritical air condition (body) U.S.
- Trecell's MuCell and Asahi Kasei's AMOTEC foam injection molding methods foam molding, foam injection molding methods and the above gas-assisted molding methods, and compression molding , Injection compression molding, transfer molding, Ono Sangyo Cisco, developed by GE Plastics, sold to heat and cool are, Sumitomo Chemical SP mold, is applied to a method that combines with the gas-assisted forming shape method of in-mold molding method.
- the present invention is applied to the production of a hollow molded article.
- FIG. 1 is a perspective view of a hollow molded article produced according to the present invention (Example 1).
- FIG. 2 is a partially enlarged view of a hollow molded article produced according to the present invention (Example 1).
- FIG. 3 is a perspective view of a hollow molded article produced according to the present invention (Example 2).
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004352925A JP2006159566A (ja) | 2004-12-06 | 2004-12-06 | 中空成形品の製造方法 |
JP2004-352925 | 2004-12-06 |
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WO2006062016A1 true WO2006062016A1 (ja) | 2006-06-15 |
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PCT/JP2005/021975 WO2006062016A1 (ja) | 2004-12-06 | 2005-11-30 | 中空成形品の製造方法 |
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WO (1) | WO2006062016A1 (ja) |
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JP7063730B2 (ja) * | 2018-06-04 | 2022-05-09 | 株式会社アルファ | 樹脂成形品の製造方法、溶着用治具及び樹脂成形品 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02212114A (ja) * | 1989-02-14 | 1990-08-23 | Toyo Mach & Metal Co Ltd | 射出成形機の成形条件入力方法 |
JPH0596560A (ja) * | 1991-10-07 | 1993-04-20 | Asahi Chem Ind Co Ltd | 中空射出成形方法 |
JPH11348084A (ja) * | 1998-06-05 | 1999-12-21 | Toshiba Mach Co Ltd | 電動射出成形機の射出速度切換制御方法 |
JP2001121546A (ja) * | 1999-10-29 | 2001-05-08 | Taisei Kako Co Ltd | 自己調芯成形金型、並びに、回転体状薄肉成形品の製造方法 |
JP2003175525A (ja) * | 2001-10-02 | 2003-06-24 | Asahi Kasei Corp | ガス加圧射出成形方法及びその成形品 |
JP2003236874A (ja) * | 2002-02-14 | 2003-08-26 | Mitsubishi Engineering Plastics Corp | 熱可塑性樹脂製のレバー及びその射出成形方法 |
-
2004
- 2004-12-06 JP JP2004352925A patent/JP2006159566A/ja active Pending
-
2005
- 2005-11-30 WO PCT/JP2005/021975 patent/WO2006062016A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02212114A (ja) * | 1989-02-14 | 1990-08-23 | Toyo Mach & Metal Co Ltd | 射出成形機の成形条件入力方法 |
JPH0596560A (ja) * | 1991-10-07 | 1993-04-20 | Asahi Chem Ind Co Ltd | 中空射出成形方法 |
JPH11348084A (ja) * | 1998-06-05 | 1999-12-21 | Toshiba Mach Co Ltd | 電動射出成形機の射出速度切換制御方法 |
JP2001121546A (ja) * | 1999-10-29 | 2001-05-08 | Taisei Kako Co Ltd | 自己調芯成形金型、並びに、回転体状薄肉成形品の製造方法 |
JP2003175525A (ja) * | 2001-10-02 | 2003-06-24 | Asahi Kasei Corp | ガス加圧射出成形方法及びその成形品 |
JP2003236874A (ja) * | 2002-02-14 | 2003-08-26 | Mitsubishi Engineering Plastics Corp | 熱可塑性樹脂製のレバー及びその射出成形方法 |
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