WO2006011415A1 - 熱可塑性樹脂の射出発泡成形方法 - Google Patents
熱可塑性樹脂の射出発泡成形方法 Download PDFInfo
- Publication number
- WO2006011415A1 WO2006011415A1 PCT/JP2005/013415 JP2005013415W WO2006011415A1 WO 2006011415 A1 WO2006011415 A1 WO 2006011415A1 JP 2005013415 W JP2005013415 W JP 2005013415W WO 2006011415 A1 WO2006011415 A1 WO 2006011415A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thermoplastic resin
- injection
- foaming
- gas
- supply
- 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
- B29C45/70—Means for plasticising or homogenising the moulding material or forcing it into the mould, combined with mould opening, closing or clamping devices
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
- B29C44/422—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum by injecting by forward movement of the plastizising screw
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/58—Moulds
- B29C44/586—Moulds with a cavity increasing in size during foaming
-
- 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
Definitions
- the present invention relates to a method for injection foam molding of thermoplastic resin. More specifically, the present invention relates to a method for injection foam molding of thermoplastic resin capable of easily, safely and efficiently obtaining an injection foam molded article having a desired cell diameter and density.
- Foam molded products in which a large number of air bubbles are present in the interior of the resin are excellent in physical properties such as lightness, heat insulation, sound absorption, and rigidity at the same mass, and thus are used in various fields. ing.
- weight reduction has been regarded as important because it is directly linked to cost reductions such as raw material costs and transportation costs, and the field of application of foam molded products has been further expanded.
- the foam molding method of resin is classified into physical foaming method and chemical foaming method according to the type of foaming agent mixed in the resin.
- a physical foaming agent an inert gas such as nitrogen or carbon dioxide; a vaporizable substance such as hydrocarbons or fluorocarbons is used.
- the chemical foaming method uses chemical foaming agents, such as organic foaming agents such as azo compounds and nitroso compounds; and inorganic foaming agents such as sodium bicarbonate.
- chemical foaming agents such as organic foaming agents such as azo compounds and nitroso compounds
- inorganic foaming agents such as sodium bicarbonate.
- an injection foam molding method in which such a foaming method is applied to an injection molding method as a resin molding method, a foaming agent-containing molten resin mixed with a foaming agent and a resin is injected and filled into a mold cavity.
- an injection foamed product having a bubble diameter of about 80 to 300 m can be obtained inside the molded product by foaming the resin.
- a foam molding method of a resin for example, foaming with bubbles inside a molded product using a short shot method (low pressure method) by mixing a chemical foaming agent or a physical foaming agent with an olefin resin and melting it.
- a molding method for obtaining a molded product has been disclosed (see Patent Document 1).
- an inert gas such as nitrogen gas; a volatile substance such as hydrocarbons and fluorocarbons, etc.
- a foaming agent-containing molten resin mixed with a foaming agent or chemical foaming agent and rosin is fed into an accumulator with an extruder, and then the foaming agent is fed into the accumulator.
- molten resin By injecting molten resin into a mold and foaming the resin, an injection foam molded product having bubbles inside the molded product is obtained.
- a method of obtaining a foamed molded product by using a physical foaming agent for example, a gas such as air, a vaporizable substance, and the like are supplied under pressure simultaneously with the supply of resin from an extruder hopper.
- a method is disclosed in which melting of rosin and inclusion and dispersion of bubbles are performed with a screw extruder (see Patent Document 2).
- polyethylene is used, and air is pressurized at about 0.69 to 0.78 MPa (7 to 8 kgfZcm 2 ) to extrude a sponge-like substance containing independent bubbles. I have a molded product.
- Patent Document 1 Japanese Patent Publication No. 44-6080
- Patent Document 2 Japanese Patent Publication No. 43-9913
- Patent Document 3 Japanese Patent Publication No. 06-506724
- Patent Documents 1 to 3 have the following problems. That is, in the case of the method disclosed in Patent Document 1, when molding is performed by supplying a resin and an organic chemical foaming agent such as an azo compound or a -troso compound, it is corrosive due to thermal decomposition. Ammonia, carbon monoxide, water vapor, cyanic acid, isocyanic acid, and the like are produced as decomposition products, and these decomposition products are released into the atmosphere and remain in the molded product. In the case of molding by supplying vaporizable substances such as hydrocarbons and fluorocarbons, which are physical foaming agents that do not generate decomposition products, the release to the atmosphere as environmental pollution and environmental destruction substances is regulated.
- an organic chemical foaming agent such as an azo compound or a -troso compound
- Patent Document 2 In the case of the method disclosed in (1), there is a problem that it is difficult to obtain a foamed molded article having a desired cell density and cell diameter because the gas is not finely dispersed in the foamed resin-containing molten resin. Furthermore, in the case of the method disclosed in Patent Document 3, a supercritical fluid generating device and a supplying device are required, and these devices are subject to legal regulations because they handle high-pressure gas, and the introduction and handling of equipment is required. When it became complicated, there was a problem.
- the present invention has been made to achieve the above-mentioned object, and the present invention provides the following method for injection foam molding of thermoplastic resin.
- a supply unit and a plasticizing unit are provided, and the thermoplastic resin supplied from the supply unit is plasticized by the plasticizing unit and injected as a foaming agent-containing molten resin containing a blowing agent.
- An injection device having a mold cavity whose volume can be enlarged and reduced, and a mold for filling the mold cavity with the foaming agent-containing molten resin ejected from the injection device.
- Injection foam molding of thermoplastic resin in which the foaming agent-containing molten resin is injected and filled into the mold cavity, and then the mold cavity is expanded to form the foaming agent-containing molten resin by foaming.
- the foaming agent is contained in the thermoplastic resin, and a mixture of a cell nucleus forming agent and a foaming gas is used as the foaming agent, and the mixture is supplied to the supply unit of the injection device.
- a mixture of a cell nucleus forming agent and a foaming gas is used as the foaming agent, and the mixture is supplied to the supply unit of the injection device.
- 0. IMPa or more, 1. less than OMPa The injection of the thermoplastic resin characterized in that the mixture is brought into contact with the pre-plasticized or plasticized thermoplastic resin present in the supply part or plasticizing part by force.
- Foam molding method hereinafter sometimes referred to as “first invention”).
- a supply section and a plasticizing section are provided, and the thermoplastic resin supplied from the supply section is plasticized by the plasticizing section and injected as a blowing agent-containing molten resin containing a blowing agent.
- an injection device having a mold cavity whose volume can be enlarged and reduced, and a mold for filling the mold cavity with the foaming agent-containing molten resin ejected from the injection device, Thermoplastic resin that is formed by injecting and filling the foaming agent-containing molten resin from the injection device into the mold cavity and then expanding the mold cavity to foam the foaming agent-containing molten resin.
- the foaming agent is contained in the thermoplastic resin, using a cell nucleus forming agent and a foaming gas as the foaming agent, and the cell core of the foaming agent.
- a forming agent is supplied to the supply unit of the injection device together with the thermoplastic resin before plasticization, and the foaming gas of the foaming agent is supplied to the supply unit or the plasticizing unit of the injection device.
- IMPa or more 1. Supply at a pressure of less than OMPa, and supply the foamable gas to the pre-plasticized or plasticized thermoplastic resin and bubble nucleating agent present in the supply section or plastic section.
- Thermoplastic resin characterized by being brought into contact Injection foam molding method (hereinafter, "second invention" t, it is Ukoto).
- the bubble nucleating agent the fine powder of at least one inorganic substance selected from the group force consisting of iron oxide, calcium silicate, zinc stearate and magnesium stearate is used. [1], [3] ] A method for injection foam molding of thermoplastic resin according to [4] or [5].
- thermoplastic resin according to any one of [1] to [7], wherein polypropylene (PP) or polyethylene (PE) is used as the thermoplastic resin.
- PP polypropylene
- PE polyethylene
- thermoplastic resin Polyacetal (POM) or polyamide (PA) is used as the thermoplastic resin.
- the method of injection foam molding of thermoplastic resin according to [2], [3], [4] or [5].
- the screw disposed in the plasticizing part is a two-stage screw.
- thermoplastic resin Automotive interior grade polypropylene (PP, melt flow index 10 to 70 ZISO-1133) is used as the thermoplastic resin, and an organic acid is used as the bubble nucleating agent in the thermoplastic resin. Used in a mixed state of 1 to 10% by mass, carbon dioxide is supplied as the foaming gas to the plastic casing at a pressure of 0.5 to 0.9 MPa, and the expansion ratio is 1.1 to 3.0.
- thermoplastic resin that can easily, safely and efficiently obtain an injection foam molded article having a desired cell diameter and density. Furthermore, it is possible to provide a method for injection foam molding of thermoplastic resin having less environmental impact.
- FIG. 1 is an explanatory view schematically showing the overall configuration of an embodiment of a horizontal clamping type injection molding apparatus used in a method for injection foam molding of thermoplastic resin according to the present invention.
- FIG. 2 is an explanatory view schematically showing a basic configuration of an example of a foaming gas supply means used in the method for injection foam molding of thermoplastic resin of the present invention.
- Injection device 31 Plasticizing cylinder
- the injection foam molding method for thermoplastic resin of the present invention includes a supply part (shown in FIG. 1 shows a hopper 35) and a plastic part (in FIG. 1).
- the plastic cylinder 31 and the screw 32 are shown), and the thermoplastic resin supplied from the supply section (hot bar) 35 is plasticized by the plastic sections (plastic cylinder and screw) 31, 32
- a mold 10 filled with Oa the foaming agent-containing molten resin is injected and filled into the mold cavity 10a from the injection device 30 and then the mold cavity 10a is expanded to expand the foaming agent-containing molten resin.
- An injection foam molding method of thermoplastic resin for foaming and molding, Incorporation of the foaming agent into the plastic resin is performed by using a mixture of a cell nucleating agent and a foaming gas as the foaming agent, and the mixture is supplied to the supply unit (hot bar) 35 of the injection device 30 or the plastic bottle part (plastic Cylinder and screw) 31, 32 ⁇ 0. More than IMPa, 1. Supply at a pressure less than OMPa and exist in supply section (Hono 35 or plastic section (plastic cylinder and screw) 31, 32) Characterized by contacting the mixture before or after plasticizing thermoplastic Is.
- the thermoplastic foam injection molding method of the present invention includes a supply section (shown as hopper 35 in FIG. 1) and a plastic collar section (shown in FIG. 1).
- the plastic cylinder 31 and the screw 32 are shown), and the thermoplastic resin supplied from the supply section (hot bar) 35 is plasticized by the plastic sections (plastic cylinder and screw) 31, 32
- a mold 10 filled with Oa the foaming agent-containing molten resin is injected and filled into the mold cavity 10a from the injection device 30 and then the mold cavity 10a is expanded to expand the foaming agent-containing molten resin.
- thermoplastic resin for foaming and molding Incorporation of foaming agent into plastic resin, using cell nucleation agent and foaming gas as foaming agent, supply of injection device 30 together with thermoplastic resin before plasticization of cell nucleation agent of foaming agent To the part (hotsuba) 35 and the foaming gas of the foaming agent to the supply part (hono 35 or plasticizing part (plasticizing cylinder and screw) 31, 32 of the injection device 30.
- IMPa or more 1.
- Pre-plasticized or plasticized thermoplastic resin and cell nuclei present in the supply section (hot bar) 35 or plastic section (plastic cylinder and screw) 31, 32 at a pressure of less than 0 MPa This is performed by bringing a foaming gas into contact with the forming agent, and the overall configuration of the horizontal clamping type injection molding apparatus 100 shown in FIG.
- a mixture of a cell nucleating agent and a foaming gas is used as the foaming agent, and this mixture is used as the supply unit (hot bar) 35 of the injection device 30 or plastic.
- OMPa preferably 0.5 to 0.9 ⁇ Pa. If the supply pressure of the mixture (foaming gas) is less than 0. IMPa, the desired bubble density and bubble diameter cannot be obtained. 1. If it is OMPa or more, the appearance of the molded product by the shell mark Defects become prominent.
- a conventional supercritical fluid generator that uses foaming gas in a supercritical state by setting the supply pressure of the mixture (foaming gas) to 0. IMPa or more and less than OMPa. And no need for feeding equipment.
- a cell nucleus forming agent and a foaming gas are used as the foaming agent
- the nucleating agent is supplied to the supply unit (hot bar) 35 of the injection device 30 together with the thermoplastic resin before plasticization
- the foaming gas of the foaming agent is supplied to the supply unit (hot bar) 35 of the injection device 30 or plastic.
- OMPa preferably at a pressure of 0.5 to 0.9 MPa, to the plasticizing section (plasticizing cylinder and screw) 31, 32.
- the reason for setting the supply pressure of the foaming gas within the above range is the same as in the case of the first invention.
- the supply section (hot bar) 35 or the plastic flange section (plastic cylinder and screw) 31, 32 of the injection device 30 for the mixture or foamable gas Is preferably performed in a state where the supply pressure is controlled (the control device 70 is shown in FIG. 1).
- the control device 70 will be described later.
- first and second inventions air, carbon dioxide, nitrogen, or a mixed gas of carbon dioxide and nitrogen, which is an inorganic gas, is used as the foaming gas.
- This configuration eliminates the need to use foaming agents that are harmful to the environment (the burden on the environment is large), and supercritical fluid generators and supply devices that are complicated to introduce and handle and are subject to legal regulations.
- it is possible to easily, safely and efficiently obtain a thermoplastic resin injection foam molded article having a desired cell density and cell diameter and having no harmful decomposition products remaining.
- At least one kind of inorganic substance is selected as the cell nucleus forming agent, and the group strength including iron oxide, calcium silicate, zinc stearate and magnesium stearate is also selected. It is preferable to use fine powder.
- organic acids such as citrate and tartaric acid, aluminum silicate, glass fiber, and a group force consisting of talc force are selected.
- Use powder too.
- olefin-based resin such as P) or polyethylene (PE) as polypropylene as the thermoplastic resin.
- a cell nucleating agent iron oxide, calcium silicate, zinc stearate, and a group power consisting of magnesium stearate, at least one inorganic fine powder selected, and as foaming gas, air, carbon dioxide, nitrogen Or when using an inorganic gas such as a mixed gas of carbon dioxide and nitrogen, polypropylene (PP), polyethylene (PE)
- olefin-based resin such as olefin can be suitably used.
- organic acids such as citrate and tartaric acid, aluminum silicate, glass fiber, and at least one fine powder selected from talc force, and as foaming gas, air, carbon dioxide, nitrogen
- an inorganic gas such as a mixed gas of carbon dioxide and nitrogen
- polyolefins such as polypropylene (PP) and polyethylene (PE), polyacetal (POM), polyamide (PA), etc. Crystalline or amorphous rosin other than olefin-based rosin may be used.
- the supply portion of the mixture or foamable gas to the injection device is the supply portion (hot bar) 35 of the injection device 30 or the plastic flange portion (plasticization).
- Cylinders and screws) 31, 32 for example, in a foaming agent-containing molten resin
- the foaming gas and the cell nucleating agent can be sufficiently dispersed and mixed in the foaming agent-containing molten resin.
- the installed screw is a two-stage screw because the foaming gas and the cell nucleating agent can be more reliably dispersed and mixed in the foaming agent-containing molten resin.
- the screw 32 is provided with a highly dispersible screw head from the viewpoint of enhancing the dispersibility and mixing of the foaming agent-containing molten resin with the foaming gas and the cell nucleating agent. I like it.
- thermoplastic resin melt flow index 10 to 70ZISO-1133
- organic acids such as citrate and tartaric acid
- PP polypropylene
- cell nucleating agent organic acids such as citrate and tartaric acid
- the horizontal mold clamping type injection molding apparatus 100 used in the present invention includes a mold 10, a mold clamping apparatus 20, an injection apparatus 30, a foaming gas supply means 40, and a control apparatus 70.
- the mold 10 is a force with the fixed mold 3 attached to the fixed platen 1 and the movable mold 4 attached to the movable platen 2, and the fixed mold 3 and the movable mold 4 have a half-push structure.
- the mold cavity 10a is formed by combining the cavity surface formed on the fixed mold 3 and the cavity surface formed on the movable mold 4 in the fitted state. It has a configuration.
- the fitting part of the half-push structure is formed over the entire circumference of the mold cavity 10a. Even if the mold cavity 10a is enlarged after injection filling, the filler filled in the mold cavity 10a is not removed from the mold 10. Prevent it from leaking out.
- the mold clamping device 20 includes a mold clamping cylinder 22 that operates to open and close the mold 10.
- the movable mold 4 is a tie bar (not shown) with respect to the fixed mold 3. It is constructed so that it can be guided back and forth, and the volume of the mold cavity 10a can be enlarged or reduced.
- the mold 10 having a semi-indentation structure is used in which the grease filled in the mold cavity 10a does not leak even if the mold 10 is opened by a predetermined stroke.
- other molds such as a flat pushing structure may be used.
- a horizontal clamping type injection molding device having a direct pressure type clamping device is used.
- a toggle type clamping device, an electric servo motor type or a rigid clamping type injection molding device is used. Use it.
- the injection device 30 includes a plastic cylinder 31, a screw 32 that is housed in the plasticizing cylinder 31 and has a flight, and a hopper 35 that supplies a molding material into the plastic cylinder 31.
- a screw moving means 33 for moving the screw 32 back and forth and a screw rotating means 34 for rotating the screw 32 are provided, and the foaming gas supply means 40 to the supply part (hot bar) 35 or the plastic part (plastic plastic) Cylinder and screw) 31 and 32 are configured to supply foaming gas into the foamed resin-containing molten resin.
- a heater (not shown) is attached to the outer peripheral surface of the plastic cylinder 31.
- the injection device 30 is configured such that a pellet-shaped molding material is supplied from the hono 35 into the plastic cylinder 31 when the screw 32 is rotated by the screw rotating means 34.
- the pelletized molding material is heated by a heater attached to the plastic cylinder 31 and is subjected to a kneading compression action by the rotation of the screw 32 to disperse and mix the foaming gas and the cell nucleating agent. Then, it is melted and sent to the front of the screw 32.
- the foamed resin-containing molten resin in which the foamable gas and the cell nucleating agent sent to the front of the screw 32 are dispersed and kneaded is attached to the tip of the plasticized cylinder 31 by the screw 32 that is advanced by the screw moving means 33.
- the filled nozzle 36 can be injected and filled into the mold.
- the bubble nucleating agent supply device 61 described later is used. 62, a suitable amount can be supplied based on the preset molding conditions.
- the screw moving means 33 is a hydraulic cylinder
- the screw rotating means 34 is a hydraulic motor.
- a screw rotating means may be used.
- the present embodiment has an inline screw type injection device that performs plasticization and injection with a single screw, but a screw prebra type injection that performs plasticization and injection with separate mechanisms.
- An apparatus may be used.
- the force that makes the shape of the screw 32 a two-stage screw. For example, when the supply position of the foaming gas is the hopper 35, V may be a single stage screw! /, .
- the foamable gas supply means 40 includes an air supply source 41, a carbon dioxide supply source 42, and a foamable gas supply device 43.
- the air supply source 41 and the carbon dioxide supply source 42 are connected by a supply path. It is connected.
- the foamable gas supply means 40 is provided with a foamable gas supply path to a gas supply port provided in the plastic cylinder 31 and the hopper 35 of the injection device 30, and to the injection device 30 based on a command from the control device 70.
- Supply foaming gas supplied gas.
- bubble nucleating agent supply devices 61 and 62 for supplying a bubble nucleating agent are provided near the end of the supply path connected to the foaming gas supply device 43 and the injection device 30. It is configured to supply a fine powder of at least one inorganic substance selected from the group strength of iron oxide, calcium silicate, zinc stearate and magnesium stearate.
- the foaming gas supply means 40 includes an air supply source 41, a carbon dioxide supply source 42, and a foaming gas supply device 43.
- Reference numeral 31 is a plastic cylinder
- reference numeral 32 is a screw
- reference numerals 61 and 62 are bubble nucleating agent supply devices for supplying a bubble nucleating agent into the foamable gas (the same reference numerals as those in FIG. 1 are attached).
- the air supply source 41 is an air compressor 45, Pressure regulator 46, check valve 47 and pressure gauge 48, carbon dioxide supply source 42, carbon dioxide cylinder 51, pressure regulator 52, pressure gauge 54 and check valve 55, foaming gas supply device 43 On-off valves 56 and 57 and electromagnetic switching valves 58 and 59 are provided.
- the air supply source 41 is configured such that the air compressed by the air compressor 45 is reduced by the pressure adjusting valve 46 and supplied to the foamable gas supply device 43 via the check valve 47.
- the air supplied to the gas supply device 43 can be sent into the injection molding device 30 from the plastic cylinder 31 and Z or the hopper 35 via the on-off valve 56 and the electromagnetic switching valves 58 and 59.
- the air that has been decompressed to a desired pressure by the pressure regulating valve 46 by opening the on-off valve 56 is supplied to the foaming gas supply device 43 via the check valve 47.
- By opening the electromagnetic switching valve 58 the air supplied to the foaming gas supply device 43 is opened from the supply port into the foaming agent-containing molten resin provided in the approximate center of the plastic cylinder 31.
- the air compressor 45 is used as the air source.
- the factory air is reduced to a predetermined pressure to directly expand the foamable gas. It may be configured to be connected to the supply device 43.
- the carbon dioxide source 42 is configured to depressurize the carbon dioxide in the carbon dioxide cylinder 51 with the pressure regulating valve 52 and supply it to the foaming gas supply device 43 through the check valve 55.
- the diacid carbon supplied to the foamable gas supply device 43 can also send the plastic cylinder 31 and the hopper force into the injection molding device 30 via the on-off valve 57 and the electromagnetic switching valves 58, 59. it can.
- the carbon dioxide decompressed to a desired pressure by the pressure regulating valve 52 by opening the on-off valve 57 is supplied to the foaming gas supply device 43 via the check valve 55.
- the dioxygen carbon supplied to the foaming gas supply device 43 is opened from the supply port into the molten resin provided in the approximate center of the plastic cylinder 31.
- the switching valve 59 By opening the switching valve 59, the gas can be fed from the gas supply port provided in the hopper 35.
- the nitrogen supply source in the case of using nitrogen as the foaming gas has the same configuration as that of the carbon dioxide supply source 42 in FIG. 2, and the nitrogen cylinder is changed to a diacid-carbon cylinder 51 as the nitrogen source. The configuration is replaced. Further, without using a nitrogen supply source, for example, the air supply source 41 is equipped with a nitrogen gas separation device having a gas permeable membrane to separate nitrogen in the air, It can also be supplied to the air compressor 45! ⁇ .
- the control device 70 is a group consisting of plasticizing the molding material, foaming gas, and iron oxide, calcium silicate, zinc stearate, and magnesium stearate as foam nucleating agents.
- An injection control unit 71 that controls the supply of fine powder of at least one inorganic substance selected from the above and injection of the foaming agent-containing molten resin into the mold 10, and mold clamping that controls the mold clamping force of the mold 10 It consists of a control unit 72 and timers.
- the mold clamping control unit 72 includes a position and speed setting unit that moves the position of the movable platen 2 so that the volume of the mold cavity 10a becomes a desired volume at the start of the foaming process of the resin.
- the foaming process includes a process of detecting the completion of resin filling in the mold cavity 10a and depressurizing the mold clamping force, and a process of expanding the volume of the mold cavity 1 Oa. Skin layers and foam nuclei are formed on the surface, and more foam nuclei are formed as the pressure-decreasing speed of the clamping force increases.
- the expansion speed of mold cavity 10a is set by the elongation viscosity of the molding resin, and the elongation viscosity is low! In the case of ⁇ , the expansion speed is slow and the extensional viscosity is high! In this case, it is preferable to set the enlargement speed fast.
- an organic acid such as citrate or tartaric acid, aluminum silicate, glass fiber, talc or the like is mixed with a molding material and supplied to an injection molding apparatus.
- a method of dry blending the cell nucleating agent in powder form into the molding material a method of adding the cell nucleating agent into a master batch and adding it to the molding material may be used.
- the pressure oil applied to the piston head side of the clamping cylinder 22 is reduced to lower the pressure of the clamping force.
- the movable platen 2 is moved in the anti-fixed platen direction, the mold 10 is opened, and the mold cavity 10a is opened. Increase the volume. Mold cavity 10a
- the volume expansion control is performed based on the setting values of the position and speed setting section for moving the position of the movable platen 2 provided in the mold clamping control unit 72.
- the movable platen 2 is set at a preset position. The position is held so that the movable platen 2 is not pushed back by the foaming pressure of the grease in the mold.
- the resin pressure in the mold cavity 10a begins to decrease, and at the same time, foaming occurs inside the resin cavity. Begin to happen.
- the mold 10 can be retracted to the molded product removal position to obtain a foam molded product.
- the fixed mold 3 and the movable mold 4 are fitted in the fitting portion, and the foaming agent in the mold cavity 10a is used. The contained molten resin does not leak out of the mold 10.
- MRF30ZISO1133 was used.
- a fine powder of iron oxide was used as a bubble nucleating agent and air was used as a foaming gas, and was injected at a pressure of 0.6 MPa into a molten resin containing a blowing agent in a plastic cylinder.
- the plasticized screw used was a two-stage screw with a mixing head attached to the screw tip.
- the molded product is a 350 x 220mm automotive interior product (glove box water) with a mold cavity thickness of 1.8mm when filled and a thickness of 3.6mm after expansion (volume) (Magnification factor 2 times) was used.
- the molding conditions were set at a resin temperature of 200 ° C and a mold temperature of 30 ° C.
- the molded product was evaluated by visual observation of the density state and appearance state of the foamed cells.
- the foamed state of the molded product cell layer obtained in Example 1 is an aggregate of fine foamed cells having a desired cell density and cell diameter, and the appearance is also good with little swirl burst and small burst leak. It was. Since fine powder of iron oxide is used as the bubble nucleating agent and air is used as the foaming gas, no harmful decomposition products are generated during molding. ⁇ We were able to obtain a foamed molded product of thermoplastic resin
- Example 2 Using fine powder of citrate as the cell nucleating agent and carbon dioxide as the foaming gas (molding machine, molding material, molded product, screw and molding conditions were the same as in Example 1), polypropylene (Mitsui Chemicals) Co., Ltd. Automotive interior grade MRF30ZISO1133) Molding material mixed with 2.5% by weight of fine powder of succinic acid is supplied to the molding machine Hotsuba, and carbon dioxide is injected into the molten resin in the plastic cylinder. Injected at a pressure of 6 MPa.
- the foamed state of the molded product cell layer obtained in Example 2 is an aggregate of fine foamed cells having a desired cell density and cell diameter, and the appearance is also good with little swirl burst.
- High-pressure carbon dioxide was used as the foaming gas (molding machine, molding material, molded product, screw and molding conditions were the same as in Example 1), polypropylene (Mitsui Igaku Co., Ltd., automotive interior grade MRF30ZISO1133)
- the carbon dioxide that was supplied to the hot press of the molding machine and pressurized by the pressure increasing device was injected into the molten resin in the plastic cylinder at a pressure of lOMPa.
- the cell layer of the molded product obtained in Comparative Example 1 is in a foamed state in which coarse bubbles are mixed, and the appearance is a fine cell having the desired cell density and cell diameter, which is marked by silver streak. It was difficult to obtain an injection-foamed molded article of foam cell aggregates.
- thermoplastic foam injection foam molding method of the present invention requires a thermoplastic resin injection foam molded article having excellent physical properties such as lightness, heat insulation, sound absorption, and rigidity at the same mass. It is suitably used in various industrial fields.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/579,414 US7858002B2 (en) | 2004-07-26 | 2005-07-21 | Method for injection expansion molding of thermoplastic resin |
JP2006529280A JP4735541B2 (ja) | 2004-07-26 | 2005-07-21 | 熱可塑性樹脂の射出発泡成形方法 |
KR1020067023058A KR101255770B1 (ko) | 2004-07-26 | 2005-07-21 | 열가소성 수지의 사출발포 성형방법 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004217333 | 2004-07-26 | ||
JP2004-217333 | 2004-07-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006011415A1 true WO2006011415A1 (ja) | 2006-02-02 |
Family
ID=35786164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/013415 WO2006011415A1 (ja) | 2004-07-26 | 2005-07-21 | 熱可塑性樹脂の射出発泡成形方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7858002B2 (ja) |
JP (1) | JP4735541B2 (ja) |
KR (1) | KR101255770B1 (ja) |
CN (1) | CN100513122C (ja) |
WO (1) | WO2006011415A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007055033A (ja) * | 2005-08-23 | 2007-03-08 | Ube Machinery Corporation Ltd | 熱可塑性樹脂の多層成形用金型及び多層成形方法 |
JP2008142997A (ja) * | 2006-12-08 | 2008-06-26 | Toyota Boshoku Corp | 射出発泡成形体の製造方法および該方法によって得られる成形体 |
JP2009202527A (ja) * | 2008-02-29 | 2009-09-10 | Prime Polymer Co Ltd | 耐湿性軽量樹脂成形体の製造方法 |
US7740776B2 (en) * | 2005-08-23 | 2010-06-22 | Ube Machinery Corporation, Ltd. | Method for foam injection molding of thermoplastic resin |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005023892A1 (de) * | 2005-05-24 | 2006-11-30 | Bosch Rexroth Aktiengesellschaft | Einspritzeinheit |
CN103608158B (zh) * | 2011-01-27 | 2017-05-24 | 新平衡运动公司 | 形成在鞋类中使用的材料的注射成型系统和方法及通过所述系统和方法制成的材料 |
CA2932723C (en) * | 2013-12-12 | 2022-08-23 | Diab International Ab | Apparatus and method for the production of expanded foam embryos |
US9956732B2 (en) | 2014-08-06 | 2018-05-01 | New Balance Athletics, Inc. | Injection molding systems and methods for forming materials used in footwear and materials manufactured by said systems and methods |
AT517359B1 (de) | 2015-07-03 | 2017-01-15 | Sonderhoff Engineering Gmbh | Vorrichtung mit intermittierend bereitgestellter flüssiger Kunststoffkomponente |
WO2017159166A1 (ja) * | 2016-03-15 | 2017-09-21 | 日立マクセル株式会社 | 発泡成形体の製造方法及び製造装置 |
CN109153161A (zh) * | 2016-04-21 | 2019-01-04 | 沙特基础工业全球技术公司 | 使用注射成型发泡工艺与模芯回退工艺结合生产具有提高的冲击性能的零件的方法 |
BR112020010880A2 (pt) * | 2017-12-01 | 2020-11-10 | Arkema Inc. | composição acrílica espumante |
CN108000823B (zh) * | 2017-12-28 | 2023-12-29 | 东华机械有限公司 | 一种化学微发泡注塑设备及化学微发泡注塑成型工艺 |
US11559927B2 (en) | 2018-03-01 | 2023-01-24 | Trexel, Inc. | Blowing agent introduction into hopper of polymer foam processing |
KR102099632B1 (ko) * | 2018-05-11 | 2020-04-13 | 김대희 | 용사법에 의한 발포금속 제조장치 |
CN109084288A (zh) * | 2018-08-31 | 2018-12-25 | 浙江晨丰科技股份有限公司 | 一种灯具散热件及成型工艺及灯具 |
WO2020189548A1 (ja) * | 2019-03-19 | 2020-09-24 | マクセル株式会社 | 電子レンジ用調理器具およびその製造方法 |
US11351707B2 (en) * | 2019-05-23 | 2022-06-07 | iMFLUX Inc. | Method and apparatus for real time control of injection of structural foaming agents, colorants, and other additives |
CN110815699A (zh) * | 2019-06-05 | 2020-02-21 | 杭州巨星科技股份有限公司 | 一种微发泡注塑成型工艺 |
US11673307B2 (en) | 2019-06-25 | 2023-06-13 | iMFLUX Inc. | Methods for controlling co-injection plastic pressure ratio between individual flow front layers |
KR102218682B1 (ko) * | 2019-08-13 | 2021-02-22 | 강명호 | 발포성형장치 및 그에 따른 발포성형방법 |
CN112776294B (zh) * | 2019-11-08 | 2022-05-13 | 中创文保科技发展(北京)有限公司 | 一种包装的制备工艺及利用该工艺制备的包装 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002079545A (ja) * | 2000-06-22 | 2002-03-19 | Mitsui Chemicals Inc | 射出発泡成形方法、並びにそれに適した射出成形機および樹脂組成物 |
JP2002200640A (ja) * | 2001-01-05 | 2002-07-16 | Sekisui Chem Co Ltd | 熱可塑性エラストマー発泡体の製造方法および熱可塑性エラストマー発泡体 |
JP2003119311A (ja) * | 2001-10-09 | 2003-04-23 | Toray Ind Inc | ポリオキシメチレン樹脂発泡成形品 |
JP2003211480A (ja) * | 2002-01-25 | 2003-07-29 | Asahi Kasei Corp | ポリアミド系樹脂組成物成形品、及びその射出成形方法 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS439913Y1 (ja) | 1965-05-29 | 1968-04-30 | ||
JPS446080Y1 (ja) | 1966-08-18 | 1969-03-05 | ||
US4144297A (en) * | 1976-12-28 | 1979-03-13 | Home Of Champions, S. A. | Method of injection molding a foamed thermoplastic resin ball core having an integral skin |
US4596832A (en) * | 1980-07-28 | 1986-06-24 | Dainippon Ink And Chemicals, Inc. | Process for producing thermoplastic resin foam |
JPH0798349B2 (ja) * | 1987-04-10 | 1995-10-25 | 三菱化学株式会社 | 熱可塑性樹脂発泡体の製造方法 |
US5034171A (en) * | 1989-11-30 | 1991-07-23 | Air Products And Chemicals, Inc. | Process for extruding thermoplastic materials using low pressure inert gases as foaming agents |
US5158986A (en) | 1991-04-05 | 1992-10-27 | Massachusetts Institute Of Technology | Microcellular thermoplastic foamed with supercritical fluid |
US5688192A (en) * | 1995-06-07 | 1997-11-18 | Acushnet Company | Solid construction golf ball incorporating compressible materials |
EP1621312A3 (en) * | 2000-06-22 | 2009-09-30 | Mitsui Chemicals, Inc. | Thermoplastic resin foam product |
US6849667B2 (en) * | 2000-10-18 | 2005-02-01 | Mitsui Chemicals, Inc. | Foam of thermoplastic urethane elastomer composition and process for producing the foam |
DE60209180T2 (de) * | 2001-01-24 | 2006-09-28 | Novartis Ag | Verfahren zur Herstellung von Linsen |
JP4889867B2 (ja) * | 2001-03-13 | 2012-03-07 | 株式会社カネカ | 末端にアルケニル基を有するビニル系重合体の製造方法、ビニル系重合体および硬化性組成物 |
US7166247B2 (en) * | 2002-06-24 | 2007-01-23 | Micron Technology, Inc. | Foamed mechanical planarization pads made with supercritical fluid |
JP4184178B2 (ja) * | 2002-07-09 | 2008-11-19 | 株式会社クラレ | 熱可塑性重合体組成物 |
US7815828B2 (en) * | 2003-09-17 | 2010-10-19 | Sekisui Plastics Co., Ltd. | Influence of each of the parameters on the foamed product strength |
-
2005
- 2005-07-21 WO PCT/JP2005/013415 patent/WO2006011415A1/ja active Application Filing
- 2005-07-21 KR KR1020067023058A patent/KR101255770B1/ko active IP Right Grant
- 2005-07-21 US US11/579,414 patent/US7858002B2/en active Active
- 2005-07-21 JP JP2006529280A patent/JP4735541B2/ja active Active
- 2005-07-21 CN CNB2005800175503A patent/CN100513122C/zh active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002079545A (ja) * | 2000-06-22 | 2002-03-19 | Mitsui Chemicals Inc | 射出発泡成形方法、並びにそれに適した射出成形機および樹脂組成物 |
JP2002200640A (ja) * | 2001-01-05 | 2002-07-16 | Sekisui Chem Co Ltd | 熱可塑性エラストマー発泡体の製造方法および熱可塑性エラストマー発泡体 |
JP2003119311A (ja) * | 2001-10-09 | 2003-04-23 | Toray Ind Inc | ポリオキシメチレン樹脂発泡成形品 |
JP2003211480A (ja) * | 2002-01-25 | 2003-07-29 | Asahi Kasei Corp | ポリアミド系樹脂組成物成形品、及びその射出成形方法 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007055033A (ja) * | 2005-08-23 | 2007-03-08 | Ube Machinery Corporation Ltd | 熱可塑性樹脂の多層成形用金型及び多層成形方法 |
US7740776B2 (en) * | 2005-08-23 | 2010-06-22 | Ube Machinery Corporation, Ltd. | Method for foam injection molding of thermoplastic resin |
JP2008142997A (ja) * | 2006-12-08 | 2008-06-26 | Toyota Boshoku Corp | 射出発泡成形体の製造方法および該方法によって得られる成形体 |
JP2009202527A (ja) * | 2008-02-29 | 2009-09-10 | Prime Polymer Co Ltd | 耐湿性軽量樹脂成形体の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
KR101255770B1 (ko) | 2013-04-17 |
JP4735541B2 (ja) | 2011-07-27 |
CN1960844A (zh) | 2007-05-09 |
KR20070048134A (ko) | 2007-05-08 |
US20080290543A1 (en) | 2008-11-27 |
US7858002B2 (en) | 2010-12-28 |
JPWO2006011415A1 (ja) | 2008-05-01 |
CN100513122C (zh) | 2009-07-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2006011415A1 (ja) | 熱可塑性樹脂の射出発泡成形方法 | |
JP4839728B2 (ja) | 熱可塑性樹脂の多層成形方法、及び多層成形装置 | |
JP4569417B2 (ja) | 熱可塑性樹脂の射出発泡成形方法 | |
JP4945957B2 (ja) | 熱可塑性樹脂の射出発泡成形方法及び射出発泡成形装置 | |
JP6628605B2 (ja) | 成形品の製造方法、成形品の製造装置 | |
JP3998374B2 (ja) | 超臨界二酸化炭素の添加方法および当該添加方法を用いた熱可塑性樹脂発泡体の製造方法 | |
US4824732A (en) | Process and apparatus for injection moulding and mouldings produced thereby | |
EP2613751A1 (en) | Polymer pellets containing supercritical fluid and methods of making and using | |
JP4640814B2 (ja) | 熱可塑性樹脂発泡体 | |
JP2003170432A (ja) | 発泡体の製造方法及び発泡体 | |
JP4951894B2 (ja) | 射出装置 | |
JP2009241537A (ja) | 射出発泡体の製造方法 | |
JP2006281698A (ja) | 発泡成形品の成形方法及び発泡成形品の成形装置 | |
JPH08300391A (ja) | 発泡性プラスチック組成物の射出成形方法 | |
JP4770334B2 (ja) | 熱可塑性樹脂の多層成形方法 | |
JP2002337186A (ja) | 射出成形機または押出機の材料供給方法 | |
JP2009226784A (ja) | 樹脂成形品の成形方法及び成形装置 | |
JP2003127191A (ja) | ハイサイクル発泡射出成形法 | |
JP2002331542A (ja) | 発泡成形方法 | |
JP2004250631A (ja) | 熱可塑性樹脂発泡体の製造方法 | |
CN102700045A (zh) | 聚丙烯物理发泡制备汽车保险杠的方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 11579414 Country of ref document: US Ref document number: 2006529280 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020067023058 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 200580017550.3 Country of ref document: CN |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |