WO2015098475A1 - 発泡成形体 - Google Patents
発泡成形体 Download PDFInfo
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- WO2015098475A1 WO2015098475A1 PCT/JP2014/082394 JP2014082394W WO2015098475A1 WO 2015098475 A1 WO2015098475 A1 WO 2015098475A1 JP 2014082394 W JP2014082394 W JP 2014082394W WO 2015098475 A1 WO2015098475 A1 WO 2015098475A1
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- instrument panel
- foamed
- panel duct
- mfr
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/228—Forming foamed products
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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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F10/02—Ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- 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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/0633—LDPE, i.e. low density polyethylene
-
- 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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0608—PE, i.e. polyethylene characterised by its density
- B29K2023/065—HDPE, i.e. high density polyethylene
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- 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2500/00—Characteristics or properties of obtained polyolefins; Use thereof
- C08F2500/12—Melt flow index or melt flow ratio
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2201/00—Foams characterised by the foaming process
- C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
- C08J2201/03—Extrusion of the foamable blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/06—CO2, N2 or noble gases
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/08—Supercritical fluid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
- C08J2205/052—Closed cells, i.e. more than 50% of the pores are closed
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2207/00—Foams characterised by their intended use
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Definitions
- the present invention relates to a foamed molded product molded from a foamed resin in a molten state.
- a tubular air conditioning duct for allowing air to flow is used.
- a foam molded article using a foamed resin obtained by foaming a thermoplastic resin with a foaming agent is known.
- the demand for expanded molded articles is increasing because they can simultaneously achieve high heat insulation and light weight.
- Patent Document 1 Japanese Patent Laid-Open No. 2005-2411557 discloses a surface on the outer surface by foam blow molding in which a supercritical fluid is added as a foaming agent.
- a foam duct having a roughness and a foaming ratio within a predetermined range is disclosed.
- Patent Document 2 Japanese Patent No. 4084209 discloses that foaming is performed with a physical foaming agent using a resin in which a specific high-density polyethylene and a specific low-density polyethylene are blended in a specific ratio as a base resin for the foam layer. And a technique for forming a foamed layer is disclosed.
- Patent Document 1 discloses an example in which a polypropylene resin is used as a raw material resin for a foam duct.
- a polypropylene resin is generally used as a raw material resin for a foam molded article.
- Patent Document 2 since the raw material of the polypropylene resin is expensive, in recent years, there is a resin using a polyethylene resin as disclosed in Patent Document 2 as the raw material resin for the foam molded article. Since polyethylene-based resins are generally less expensive than polypropylene-based resins, it is possible to produce foamed molded articles at low cost.
- the present inventors tried to obtain a desired foamed molded product by using a polyethylene-based resin as a raw material resin for the foamed molded product.
- the foamed molded product molded by clamping with a split mold is taken out from the split mold, the resin constituting the foamed molded product is divided into molds. As a result, the foamed molded product could not be easily removed from the split mold. For this reason, it is desired that the foamed molded product can be easily taken out from the split mold.
- An object of the present disclosure is to obtain a foamed molded product that can be easily taken out from a split mold.
- the foamed molded product according to one aspect of the present disclosure is: A foamed molded article formed by clamping a foamed resin obtained by melting and kneading a polyethylene resin with a split mold, MFR (190 degreeC, g / 10min) of the shape
- molded said foaming molding is less than 0.8, It is characterized by the above-mentioned.
- the polyethylene resin has an MFR (190 ° C., g / 10 min) of 1.0 or less.
- FIG. FIG. 3 is a cross-sectional view taken along the line D-D ′ of FIG. 2.
- It is a 1st figure which shows the example of a shaping
- It is a 3rd figure which shows the example of a shaping
- FIG. 1 is a diagram illustrating a configuration example of a foamed molded body 1 according to an aspect of the present disclosure.
- FIG. 9 is a diagram for explaining a foamed molded body 1 according to an aspect of the present disclosure.
- the foamed molded body 1 is a foamed molded body 1 formed by clamping a foamed resin obtained by melting and kneading a polyethylene resin with a split mold.
- the foamed molded product 1 according to one embodiment of the present disclosure is characterized in that the molded foamed molded product 1 has an MFR (190 ° C., g / 10 minutes) of less than 0.8. .
- the MFR (190 ° C., g / 10 minutes) of the polyethylene resin is 1.0 or less.
- the molded foamed molded product 1 When the molded foamed molded product 1 is taken out from between the split molds by setting the MFR of the molded foamed molded product 1 to less than 0.8 or the MFR of the polyethylene resin to 1.0 or less, foaming is performed.
- the foamed resin constituting the molded body 1 does not stick to the split mold, and the foam molded body 1 can be easily taken out from the split mold.
- an embodiment of a foamed molded product 1 according to one aspect of the present disclosure will be described in detail with reference to the accompanying drawings.
- the instrument panel duct 1 will be described as an example of the foam molded body 1.
- FIG. 1 is a schematic plan view of the instrument panel duct 1 and shows the instrument panel duct 1 on the side having a supply unit 105 for connection to an air conditioner unit (not shown).
- FIG. 2 is a schematic plan view of the periphery of the fitting portion 102d shown in FIG. 1, and
- FIG. 3 is a sectional view taken along the line DD ′ of FIG.
- the instrument panel duct 1 of the present embodiment is a lightweight instrument panel duct 1 for circulating cool and warm air supplied from an air conditioner unit to a desired part.
- the instrument panel duct 1 of this embodiment is molded by clamping a foamed resin obtained by melting and kneading a predetermined polyethylene resin with a split mold and blow molding.
- the instrument panel duct 1 of the present embodiment has a closed cell structure (for example, a closed cell rate of 70% or more) having a foaming ratio of 1.3 times or more and a plurality of bubbles.
- the average thickness of the instrument panel duct 1 is 0.5 mm or more.
- the surface roughness Rmax of the inner surface of the duct of the instrument panel duct 1 is 200 ⁇ m or less. By configuring the surface roughness Rmax to be 200 ⁇ m or less, the ventilation efficiency can be improved.
- the instrument panel duct 1 of the present embodiment preferably has a tensile fracture elongation at ⁇ 10 ° C. of 40% or more and a tensile elastic modulus at room temperature of 1000 kg / cm 2 or more. Further, the tensile fracture elongation at ⁇ 10 ° C. is preferably 100% or more. The terms used in this embodiment are defined below.
- Foaming ratio A value obtained by dividing the density of the foamed resin used in the molding method of the present embodiment, which will be described later, by the apparent density in the tube main body X1 (see FIG. 3) of the instrument panel duct 1 obtained by the molding method of the present embodiment. The expansion ratio was taken.
- Tensile elongation at break After cutting out the tube main body X1 of the instrument panel duct 1 obtained by the molding method of this embodiment described later, and storing at -10 ° C, the tensile speed is 50 mm as a No. 2 type test piece according to JIS K-7113. The value measured at / min was taken as the tensile elongation at break.
- Tensile elastic modulus The tube body X1 of the instrument panel duct 1 obtained by the molding method of this embodiment described later is cut out and pulled at a normal temperature (for example, 23 ° C.) as a No. 2 type test piece according to JIS K-7113. Was measured at 50 mm / min as the tensile elastic modulus.
- a supply unit 105 for connection to an air conditioner unit is provided at one end of the pipe unit 101 (101a to 101d). Further, the fitting part 102 (102a to 102d) is provided at the other end of the pipe part 101 (101a to 101d). Further, a flange portion 103 (103a to 103g) is connected to a tube main body X1 (see FIG. 3) composed of the tube portion 101 (101a to 101d), the supply portion 105, and the fitting portion 102 (102a to 102d). .
- the average thickness means an average value of the thickness measured at equal intervals of about 100 mm in the hollow drawing direction of the molded product. If it is a hollow molded product, measure the wall thickness in the direction of the 90 ° direction of each part of the two wall parts welded via the parting line, and mean the average value of the measured thickness To do. However, the above-described flange portion 103 and the like are not included in the measurement position.
- the inner side of the pipe body X1 is configured to have a flow path through which the fluid flows, so that the cool and warm air of the air conditioner unit can be circulated.
- the flow path of the fluid supplied from the opening 111 of the supply section 105 to the inside of the tube main body X1 is divided into four paths A, B-1, B-2, and C as shown in FIG.
- the fluid supplied from the opening 111 of the supply unit 105 to the inside of the tube main body X1 flows out from the opening of the fitting portion 102a in the flow path A. Further, in the flow path B-1, it flows out from the opening of the fitting portion 102b. Further, in the flow path B-2, it flows out from the opening of the fitting portion 102c. Moreover, in the flow path C, it flows out from the opening part of the fitting part 102d.
- a supply portion 105 is provided at one end of the tube portion 101a, and a fitting portion 102a is provided at the other end.
- flange portions 103a and 103e are connected to a tube main body X1 including the tube portion 101a, the supply portion 105, and the fitting portion 102a.
- the flange portion 103a is provided with a fixing hole 107a for fixing to another tubular member connected by the fitting portion 102a.
- the instrument panel duct 1 can be fixed to another tubular member by passing a bolt (not shown) through the fixing hole 107a and tightening it with a nut.
- a fixing hole 107e is also formed in the flange portion 103e.
- a supply portion 105 is provided at one end of the tube portion 101b, and a fitting portion 102b is provided at the other end. Further, the flange portion 103b is connected to the tube main body X1 including the tube portion 101b, the supply portion 105, and the fitting portion 102b. The flange portion 103b is provided with a fixing hole 107b for fixing to another tubular member connected by the fitting portion 102b.
- a bridging portion 104e for maintaining strength is connected to each of the pipe portions 101a and 101b at a portion where the distance between the pipe portions 101a and 101b is narrow.
- the configuration around the channel B-2 in the instrument panel duct 1 is the same as the configuration around the channel B-1.
- the configuration around the flow path C in the instrument panel duct 1 is the same as the configuration around the flow path A described above.
- a flange part 103g is provided so as to be connected to the pipe parts 101b and 101c.
- a fixing hole 107g is also formed in the flange portion 103g.
- flange portions 103 (103a to 103g) are connected to the outside of the tube main body X1 (see FIG. 3).
- the tube main body X1 means a portion composed of the tube portion 101 (101a to 101d), the supply portion 105, and the fitting portion 102 (102a to 102d).
- the opening area of the opening portion 100 of the fitting portion 102 is larger than the opening area of the pipe portion 101.
- the opening area of the pipe part 101 means the area of the opening part of the pipe part 101 cut in the direction orthogonal to the flow path traveling direction of the instrument panel duct 1 at the location of the pipe part 101.
- the shape of the fitting part 102 can be realized by a trumpet shape.
- the trumpet shape refers to a shape in which the opening area increases toward the opening end.
- FIG. 4 is a view showing the open state of the split mold
- FIG. 5 is a view showing the closed state of the split mold from the side of the split mold
- FIG. 6 is a cross-sectional view showing the closed state of the divided molds from the contact surfaces of the two divided molds to the divided mold 12a side.
- the foamed parison is injected from the annular die 11, and the cylindrical foamed parison 13 is pushed out between the divided molds 12a and 12b.
- the divided molds 12a and 12b are clamped, and the foam parison 13 is sandwiched between the divided molds 12a and 12b as shown in FIG. Thereby, the foam parison 13 is accommodated in the cavities 10a and 10b of the divided molds 12a and 12b.
- the blowing needle 14 and the blowing needle 15 are passed through predetermined holes provided in the divided molds 12 a and 12 b with the divided molds 12 a and 12 b clamped. And pierce the foam parison 13 simultaneously. As soon as the tips of the blowing needle 14 and the blowing needle 15 enter the foamed parison 13, a compressed gas such as air is blown from the blowing needle 14 into the foamed parison 13, and the blowing needle 15 passes through the foamed parison 13. Compressed gas is blown out of the tube, and blow molding is performed at a predetermined blow pressure.
- the blowing needle 14 is pierced into a position corresponding to the opening 111 of the supply unit 105 of the instrument panel duct 1 shown in FIG. 1 to form a blowing port for blowing compressed gas into the foamed parison 13. Further, the blowing needle 15 is pierced into a position corresponding to each of the opening portions 100 (100a to 100d) of the fitting portions 102 (102a to 102d) of the instrument panel duct 1 shown in FIG. A blowout opening is formed for blowing out.
- the compressed gas can be blown into the inside of the foam parison 13 from the blow needle 14, the compressed gas can be blown out from the blow needle 15 through the inside of the foam parison 13, and blow molding can be performed with a predetermined blow pressure.
- compressed gas is blown into the foam parison 13 from the blow needle 14 and exhaust is performed from the cavities 10a and 10b of the split molds 12a and 12b, and a gap between the foam parison 13 and the cavities 10a and 10b is formed. Eliminate and let negative pressure. As a result, a pressure difference is set between the inside and outside of the foam parison 13 housed in the cavities 10a and 10b inside the split molds 12a and 12b (the inside of the foam parison 13 means a higher pressure than the outside), and the foam parison 13 Is pressed against the wall surfaces of the cavities 10a and 10b.
- the step of blowing compressed gas into the foam parison 13 and the step of generating a negative pressure outside the foam parison 13 do not need to be performed at the same time, and the steps are shifted in time. It is also possible to do this.
- the foam parison 13 is clamped with the pressing force Z by the divided molds 12a and 12b. Therefore, as described above, the portion of the foam parison 13 that becomes the tube main body X1 is pressed against the cavities 10a and 10b by a predetermined blow pressure, and the flange portions 103 (103a to 103g) and the bridging portions 104 (104e and 104f) are pressed. The portion that becomes the plate-like portion Y1 is pressed in the thickness direction and compressed to the thickness between the cavities 10a and 10b of the divided molds 12a and 12b.
- the compressed gas such as air
- the compressed gas from the blow needle 15 passes through the inside of the foam parison 13. Blow out.
- the foam parison 13 is pressed against the cavities 10a and 10b by a predetermined blow pressure for a predetermined time, and about 50 to 80% of the foam parison 13 is cooled and solidified from the cavities 10a and 10b in the thickness direction of the tube body X1. .
- the remaining foamed parison 13 in the molten state is naturally solidified with the molds clamped by the divided molds 12a and 12b.
- the temperature of the compressed gas supplied for cooling from the blowing needle 14 into the foamed parison 13 is preferably set to 10 ° C. to 30 ° C. and set to room temperature (for example, 23 ° C.).
- room temperature for example, 23 ° C.
- the cooling time of the instrument panel duct 1 can be shortened.
- the cooling time by the compressed gas is preferably 35 seconds or less.
- the foam parison 13 is cooled and solidified from the cavities 10a and 10b in the thickness direction of the tube body X1, and the foam parison 13 on the inner surface side of the tube body X1 can be left in a molten state. it can. Thereafter, the remaining foamed parison 13 in the molten state can be naturally solidified without being cooled by the compressed gas and being clamped by the divided molds 12a and 12b.
- the resin applicable when molding the instrument panel duct 1 of the present embodiment is preferably a foamed resin obtained by melt-kneading a predetermined polyethylene resin so that the MFR of the instrument panel duct 1 that is a molded product is less than 0.8. .
- the MFR is a value obtained by measuring a resin obtained by heating and melting a sample piece cut out from a molded product at a test temperature of 190 ° C. and a test load of 2.16 kg according to JIS K-7210. The surface roughness, removal property, and deburring property will be described later in Examples.
- the polyethylene resin forming the foamed resin is a low density polyethylene resin alone, a high density polyethylene resin alone, a blend resin in which a plurality of low density polyethylene resins are mixed, a blend resin in which a plurality of high density polyethylene resins are mixed, It is formed by melt-kneading a blend resin obtained by mixing a low-density polyethylene resin and a high-density polyethylene resin.
- MFR (190 degreeC, g / 10min) of the polyethylene-type resin which forms foamed resin shall be 1.0 or less.
- the MFR obtained by calculating the MFR of the two types of polyethylene resins by the mixing ratio of the two types of polyethylene resins is the following formula 1. Try to be satisfied.
- A is the MFR of the first polyethylene resin
- B is the MFR of the second polyethylene resin
- X is the mixing ratio of the first polyethylene resin forming the foamed resin
- the foamed resin is preferably formed using a polyethylene resin produced by an autoclave method rather than a polyethylene resin produced by a tubular method. This is because the expansion ratio of the instrument panel duct 1 that is a molded product can be increased by using a polyethylene resin produced by an autoclave method rather than a polyethylene resin produced by a tubular method.
- the low density polyethylene resin preferably has an MFR of 1.0 to 3.0.
- the foamed resin used when molding the instrument panel duct 1 can also be formed by using a pulverized material obtained by pulverizing burrs generated when molding the instrument panel duct 1. In this case, it is preferable to form the foamed resin by melt-kneading the pulverized material and the virgin material, rather than forming the foamed resin with 100% of the pulverized material.
- the virgin material is an unused resin, and in the present embodiment, the above-described polyethylene-based resin is used. By using the virgin material, it is possible to avoid deterioration of the resin constituting the instrument panel duct 1.
- the pulverized material and the virgin material are melt-kneaded to form the foamed resin, the pulverized material and the virgin material are melt-kneaded at a ratio of 90% and virgin material.
- examples of the foaming agent that can be applied when the instrument panel duct 1 of the present embodiment is molded include a physical foaming agent, a chemical foaming agent, and a mixture thereof.
- Physical foaming agents include inorganic physical foaming agents such as air, carbon dioxide, nitrogen gas, and water, organic physical foaming agents such as butane, pentane, hexane, dichloromethane, dichloroethane, and their supercritical fluids. Can be applied.
- the supercritical fluid is preferably prepared using carbon dioxide, nitrogen, or the like. If nitrogen, the critical temperature is -149.1 ° C., the critical pressure is 3.4 MPa or more, and if carbon dioxide, the critical temperature is 31. It can be created by setting the critical pressure to 7.4 MPa or higher.
- the molded instrument panel 1 is taken out from the divided molds 12a and 12b. Specifically, the split molds 12a and 12b are opened in a state where a burr formed on the upper part of the instrument panel duct 1 is gripped by a predetermined machine (a clip or the like), and the instrument panel duct 1 is opened between the split molds 12a and 12b. Take out.
- a predetermined machine a clip or the like
- the instrument panel duct 1 of the present embodiment includes all fitting portions 102 (102a to 102d) constituting the pipe body X1 and all the openings 100 (100a to 100d) formed in the supply portion 105, A flange portion 103 (103a to 103g) and a bridging portion 104 (104e, 104f) are provided in the vicinity of 111.
- the instrument panel duct 1 of this embodiment can fix the instrument panel duct 1 to other tubular members around the openings 100 and 111. Further, the strength around the openings 100 and 111 can be strengthened.
- the instrument panel duct 1 of the present embodiment is difficult to be taken out from the divided molds 12a and 12b because the overall outer shape is complicated.
- the instrument panel duct 1 as the embodiment described above can be molded by, for example, the molding method shown in FIG.
- the molding method shown in FIG. 8 replaces the molding of the cylindrical foamed parison 13 between the divided molds 12a and 12b by the molding method described above, and replaces the sheet-shaped foamed resin between the divided molds 12a and 12b. It is extruded and molded.
- a molding apparatus used in another molding method includes two extrusion apparatuses 50a and 50b and split molds 12a and 12b similar to the above-described molding method examples. .
- the extrusion apparatus 50 (50a, 50b) is a predetermined interval between the divided molds 12a, 12b, and the resin sheets P1, P2 made of a foamed resin in a molten state, using the same material as the foam parison 13 in the above-described molding method example. It is arranged so that it hangs down substantially in parallel. Adjustment rollers 30a and 30b are disposed below the T dies 28a and 28b for pushing out the resin sheets P1 and P2, and the thicknesses and the like are adjusted by the adjustment rollers 30a and 30b. The resin sheets P1 and P2 thus extruded are sandwiched between the molds 12a and 12b, and are clamped and molded.
- the extrusion apparatus 50 includes a cylinder 22 provided with a hopper 21, a screw (not shown) provided in the cylinder 22, a hydraulic motor 20 connected to the screw, an accumulator 24 in which the cylinder 22 communicates with the inside, A plunger 26 provided in the accumulator 24, a T die 28, and a pair of adjusting rollers 30 are provided.
- the resin pellets introduced from the hopper 21 are melted and kneaded by rotation of the screw by the hydraulic motor 20 in the cylinder 22, and the foamed resin in the molten state is transferred to the accumulator 24 and stored in a certain amount, and driven by the plunger 26.
- the foamed resin is sent toward the T die 28.
- a continuous resin sheet made of a foamed resin in a molten state is pushed out and sent downward while being pinched by a pair of adjusting rollers 30 arranged at intervals. It hangs down between the split molds 12a and 12b.
- the T die 28 is provided with a die bolt 29 for adjusting the slit interval of the extrusion slit.
- the slit interval adjusting mechanism may include various other known adjusting mechanisms.
- the resin sheets P1 and P2 having bubble cells inside are extruded from the extrusion slits of the two T dies 28a and 28b, and are adjusted to have a uniform thickness in the vertical direction (meaning the extrusion direction). And is suspended between the divided molds 12a and 12b.
- the divided molds 12a and 12b are advanced in the horizontal direction, and a mold frame (not shown) located on the outer periphery of the divided molds 12a and 12b. Is closely attached to the resin sheets P1 and P2. After the resin sheets P1 and P2 are thus held by the molds on the outer periphery of the divided molds 12a and 12b, the resin sheets P1 and P2 are vacuum-sucked into the cavities 10a and 10b of the divided molds 12a and 12b. Each P2 is shaped along the cavities 10a and 10b.
- the divided molds 12a and 12b are advanced in the horizontal direction and clamped, and the blowing needle 14 and the blowing needle 15 are pierced into the resin sheets P1 and P2 and air is blown from the blowing needle 14 in the same manner as the molding method described above. Or the like is blown into the resin sheets P1 and P2, and the compressed gas is blown out from the blowing needle 15 via the resin sheets P1 and P2. In this way, the inside of the part which becomes the pipe body X1 of the instrument panel duct 1 is cooled.
- the split molds 12a and 12b are moved backward in the horizontal direction, and the split molds 12a and 12b are released from the instrument panel duct 1.
- the resin sheets P1 and P2 suspended between the pair of split molds 12a and 12b have a resin sheet thickness and an extrusion speed in order to prevent variations in thickness due to drawdown, neck-in, and the like. It is necessary to individually adjust the thickness distribution in the extrusion direction. Various adjustments such as the thickness of the resin sheet, the extrusion speed, and the thickness in the extrusion direction may be used.
- the instrument panel duct 1 according to the present embodiment can be suitably molded by the other molding method examples shown in FIG. 8 as in the molding methods described with reference to FIGS. Further, in another example of the molding method shown in FIG. 8, the instrument panel duct 1 corresponding to various conditions is molded by making the materials, foaming magnifications, thicknesses, etc. of the two resin sheets P1, P2 different. It is also possible.
- Example 1 As a raw material resin for the instrument panel duct 1, a foamed blow molding machine equipped with a screw-type extruder having a gas supply port in a cylinder is used as a foamed resin obtained by melting and kneading resin A at 50 parts by mass and resin B at 50 parts by mass. A supercritical fluid of nitrogen is added from the gas supply port, and a sample of the instrument panel duct 1 having the same shape as that shown in FIG. 1 is foamed and blown under the following molding conditions by the same molding method as in FIGS. Molded.
- the MFR (190 ° C., g / 10 minutes) of the resin material calculated from the blend ratio of 50 parts by mass of resin A and 50 parts by mass of resin B is 1.00.
- molded instrument panel duct 1 was 0.40. Moreover, the expansion ratio of the molded instrument panel duct 1 was 4.3 times. Moreover, the surface roughness Rmax of the duct inner surface of the molded instrument panel duct 1 was 200 ⁇ m or less, and the surface roughness was good ( ⁇ ). Further, when the molded instrument panel duct 1 is taken out from the split molds 12a and 12b, the foamed resin constituting the instrument panel duct 1 does not stick to the split molds 12a and 12b, and the instrument panel duct 1 is removed from the split mold 12a. , 12b can be easily taken out, and the take-out property is good ( ⁇ ). Moreover, the burr
- MFR is a value measured at a test temperature of 190 ° C. and a test load of 2.16 kg according to JIS K-7210.
- the expansion ratio was obtained by dividing the density of the foamed resin used when molding the instrument panel duct 1 by the apparent density in the tube body X1 of the molded instrument panel duct 1 (see FIG. 3).
- the surface roughness Rmax indicates the maximum height measured using a surface roughness measuring machine (Surfcom 470A manufactured by Tokyo Seimitsu Co., Ltd.).
- the measurement site of the surface roughness was the entire region of the inner surface of the instrument panel duct 1.
- the evaluation method of the surface roughness was good ( ⁇ ) when Rmax was 200 ⁇ m or less in all regions.
- the evaluation method of the take-out property is that, after blow molding, the split molds 12a and 12b are opened in a state where the burrs formed on the upper part of the instrument panel duct 1 are gripped by a predetermined machine (such as a clip), so When taking out from between 12a and 12b, the foamed resin constituting the instrument panel duct 1 did not stick to the split molds 12a and 12b, and the instrument panel duct 1 could be easily taken out from the split molds 12a and 12b. In the case, it was judged as good ( ⁇ ).
- the foamed resin constituting the instrument panel duct 1 is adhered to the split molds 12a and 12b.
- the instrument panel duct 1 moved more than a predetermined distance with the movement of 12a and 12b, it was judged as defective (x). Further, the case where the foamed resin remained in the divided molds 12a and 12b was also judged as defective (x).
- flash formed in the upper part of the instrument panel duct 1 is the part of the foaming resin which protruded from the upper part of the division mold 12a, 12b in the state which clamped the division mold 12a, 12b.
- the deburring property evaluation method is such that when a part of the burr formed around the instrument panel duct 1 taken out from the divided molds 12a and 12b is cut with a cutter or the like to remove the burr using a hand or the like. Was easily removed from the instrument panel duct 1 (good). Further, when the burr was removed and the burr was broken and remained in the instrument panel duct 1 or when the instrument panel duct 1 was deformed when the burr was removed, it was judged as defective (x). The burr is a part formed around the parting line of the instrument panel duct 1, and a thin part formed by pinch-off exists between the instrument panel duct 1 and the burr, and the burr is cut at the thin part. Become.
- Example 2 The instrument panel duct 1 was molded in the same manner as in Example 1 except that the resin used for the instrument panel 1 was a foamed resin obtained by melting and kneading the resin A at 60 parts by mass and the resin B at 40 parts by mass.
- the MFR (190 ° C., g / 10 minutes) of the resin material calculated from the blend ratio of 60 parts by mass of resin A and 40 parts by mass of resin B is 0.86.
- molded instrument panel duct 1 was 0.37.
- the expansion ratio of the molded instrument panel duct 1 was 3.9 times.
- the surface roughness, removal property, and deburring property were all good ( ⁇ ).
- Example 3 The instrument panel duct 1 was molded in the same manner as in Example 1 except that the resin used for the instrument panel 1 was a foamed resin obtained by melting and kneading the resin A at 70 parts by mass and the resin B at 30 parts by mass.
- the MFR (190 ° C., g / 10 minutes) of the resin material calculated from the blend ratio of 70 parts by mass of resin A and 30 parts by mass of resin B is 0.72.
- molded instrument panel duct 1 was 0.26. Moreover, the expansion ratio of the molded instrument panel duct 1 was 2.8 times. Further, the surface roughness, removal property, and deburring property were all good ( ⁇ ).
- Example 4 The instrument panel duct 1 was molded in the same manner as in Example 1 except that the raw material resin for the instrument panel duct 1 was a foamed resin obtained by melting and kneading the resin A at 80 parts by mass and the resin B at 20 parts by mass.
- the MFR (190 ° C., g / 10 minutes) of the resin material calculated from the blend ratio of 80 parts by mass of resin A and 20 parts by mass of resin B is 0.58.
- molded instrument panel duct 1 was 0.22.
- the expansion ratio of the molded instrument panel duct 1 was 2.2 times.
- the surface roughness, removal property, and deburring property were all good ( ⁇ ).
- Example 5 The instrument panel duct 1 was molded in the same manner as in Example 1 except that the resin used for the instrument panel 1 was a foamed resin obtained by melting and kneading the resin A at 90 parts by mass and the resin B at 10 parts by mass.
- the MFR (190 ° C., g / 10 minutes) of the resin material calculated from the blend ratio of 90 parts by mass of resin A and 10 parts by mass of resin B is 0.44.
- molded instrument panel duct 1 was 0.18.
- the expansion ratio of the molded instrument panel duct 1 was 1.6 times.
- the surface roughness, removal property, and deburring property were all good ( ⁇ ).
- Example 6 The instrument panel duct 1 was molded in the same manner as in Example 1 except that the raw material resin for the instrument panel duct 1 was a foamed resin obtained by melting and kneading the resin A at 60 parts by mass and the resin C at 40 parts by mass.
- the MFR (190 ° C., g / 10 minutes) of the foamed resin obtained by melt-kneading Resin A and Resin C was 0.9.
- the MFR (190 ° C., g / 10 minutes) of the resin material calculated from the blend ratio of 60 parts by mass of resin A and 40 parts by mass of resin C is 0.90.
- molded instrument panel duct 1 was 0.39.
- the expansion ratio of the molded instrument panel duct 1 was 1.6 times.
- the surface roughness, removal property, and deburring property were all good ( ⁇ ).
- Example 7 The instrument panel duct 1 was molded in the same manner as in Example 1 except that the resin used for the instrument panel 1 was a foamed resin obtained by melting and kneading the resin A at 60 parts by mass and the resin D at 40 parts by mass.
- the MFR (190 ° C., g / 10 minutes) of the foamed resin obtained by melt-kneading Resin A and Resin D was 0.34.
- the MFR (190 ° C., g / 10 minutes) of the resin material calculated from the blend ratio of 60 parts by mass of resin A and 40 parts by mass of resin D is 0.34.
- molded instrument panel duct 1 was 0.17.
- the expansion ratio of the molded instrument panel duct 1 was 1.3 times.
- the surface roughness, removal property, and deburring property were all good ( ⁇ ).
- Example 8 The instrument panel duct 1 was molded in the same manner as in Example 1, except that the resin resin D was a foamed resin obtained by melting and kneading the resin D at 100 parts by mass. MFR (190 degreeC, g / 10min) of the resin material which computed resin D with the blend ratio of 100 mass parts is 0.40.
- molded instrument panel duct 1 was 0.18.
- the expansion ratio of the molded instrument panel duct 1 was 1.6 times.
- the surface roughness, removal property, and deburring property were all good ( ⁇ ).
- Example 1 The instrument panel duct 1 was molded in the same manner as in Example 1 except that the resin resin B was a foamed resin obtained by melting and kneading the resin B at 100 parts by mass. MFR (190 degreeC, g / 10min) of the resin material which calculated resin B by the blend ratio of 100 mass parts is 1.70.
- molded instrument panel duct 1 was 0.80. Moreover, the expansion ratio of the molded instrument panel duct 1 was 5.0 times. Moreover, the surface roughness Rmax of the duct inner surface of the molded instrument panel duct 1 was 200 ⁇ m or less, and the surface roughness was good ( ⁇ ). Further, when the molded instrument panel duct 1 is taken out from the split molds 12a and 12b, the foamed resin constituting the instrument panel duct 1 sticks to the split molds 12a and 12b, and the instrument panel duct 1 is removed from the split molds 12a and 12b. It could not be easily taken out, and the takeout property was poor (x). Moreover, the burr
- the instrument panel duct 1 was molded in the same manner as in Example 1 except that the raw material resin for the instrument panel duct 1 was a foamed resin obtained by melting and kneading the resin E at 60 parts by mass and the resin B at 40 parts by mass.
- the MFR (190 ° C., g / 10 minutes) of the resin material calculated from the blend ratio of 60 parts by mass of resin E and 40 parts by mass of resin B is 3.68.
- molded instrument panel duct 1 was 3.20. Moreover, the expansion ratio of the molded instrument panel duct 1 was 4.3 times. Further, the surface roughness Rmax on the inner surface of the molded instrument panel duct 1 was partially higher than 200 ⁇ m, and the surface roughness was poor ( ⁇ ). Further, when the molded instrument panel duct 1 is taken out from the split molds 12a and 12b, the foamed resin constituting the instrument panel duct 1 sticks to the split molds 12a and 12b, and the instrument panel duct 1 is removed from the split molds 12a and 12b. It could not be easily taken out, and the takeout property was poor (x). Moreover, the burr
- FIG. 9 shows the blend ratio of the resin material used when molding the instrument panel ducts 1 of Examples 1 to 8 and Comparative Examples 1 and 2, the MFR of the resin material calculated based on the blend ratio, the molded instrument panel duct 1 MFR, foaming magnification, surface roughness, takeout property, and deburring property of the molded instrument panel duct 1 are shown.
- the MFR of the molded instrument panel 1 is less than 0.8, or the MFR of the resin material calculated by the blend ratio is 1.0 or less, so that the surface of the instrument panel duct 1 It was found that an instrument panel duct 1 having good roughness, extractability and deburring properties was obtained. Moreover, it turned out that the instrument panel duct 1 with a high expansion ratio can be obtained by using the foamed resin which mixed the high density polyethylene-type resin and the low density polyethylene-type resin. Moreover, it became clear that the instrument panel duct 1 with a high expansion ratio can be obtained by using a foamed resin mixed with a polyethylene resin produced by an autoclave method.
- the MFR of the molded instrument panel 1 is less than 0.8, or the MFR of the resin material calculated by the blend ratio is 1.0. It was found that the instrument panel duct 1 having the surface roughness, the take-out property, and the deburring property of the instrument panel duct 1 are all good by making the following conditions.
- the instrument panel duct 1 has been described as an example. However, it can also be applied to a rear cooler duct or the like.
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Abstract
Description
ポリエチレン系樹脂を溶融混練した発泡樹脂を分割金型で型締めして成形した発泡成形体であって、
成形した前記発泡成形体のMFR(190℃、g/10分)が0.8未満である、ことを特徴とする。
または、前記ポリエチレン系樹脂のMFR(190℃、g/10分)が1.0以下である、ことを特徴とする。
まず、図1、図9を参照しながら、本開示の一態様にかかる発泡成形体1の実施形態の概要について説明する。図1は、本開示の一態様にかかる発泡成形体1の構成例を示す図である。図9は、本開示の一態様にかかる発泡成形体1を説明するための図である。
まず、図1~図3を参照しながら、本実施形態のインパネダクト1の構成例について説明する。図1は、インパネダクト1の概略平面図であり、エアコンユニット(図示せず)に接続するための供給部105を有する側のインパネダクト1を示す。図2は、図1に示す嵌め合い部102d周辺の概略平面図を示し、図3は、図2のD-D’断面図を示す。
引張破壊伸び:後述する本実施形態の成形方法により得られたインパネダクト1の管本体X1を切り出し、-10℃で保管後に、JIS K-7113に準じて2号形試験片として引張速度を50mm/分で測定を行った値を引張破壊伸びとした。
引張弾性率:後述する本実施形態の成形方法により得られたインパネダクト1の管本体X1を切り出し、常温(例えば、23℃)で、JIS K-7113に準じて2号形試験片として引張速度を50mm/分で測定を行った値を引張弾性率とした。
次に、図4~図6を参照しながら、本実施形態のインパネダクト1の成形方法例について説明する。図4は分割金型の開状態、図5は分割金型の閉状態を分割金型側面から示した図である。図6は、分割金型の閉状態を2つの分割金型の当接面から分割金型12a側について示す断面図である。
A×X/100+B×Y/100≦1.0・・・式1
Aは、第1のポリエチレン系樹脂のMFR
Bは、第2のポリエチレン系樹脂のMFR
Xは、発泡樹脂を形成する第1のポリエチレン系樹脂の混合割合
Yは、発泡樹脂を形成する第2のポリエチレン系樹脂の混合割合
X+Y=100とする。
上述した実施形態としてのインパネダクト1は、例えば、図8に示す成形方法で成形することも可能である。
こうした樹脂シートの厚み、押出速度、押出方向の肉厚等の調整は、公知の各種方法を用いてよい。
次に、実施例、比較例により上述したインパネダクト1について説明する。但し、以下の実施例に限定されるものではない。
インパネダクト1の原料樹脂として、樹脂Aを50質量部、樹脂Bを50質量部で溶融混練した発泡樹脂とし、シリンダにガス供給口を有するスクリュー式押出機を備えた発泡ブロー成形機を用い、ガス供給口より窒素の超臨界流体を添加し、上述した図4~図6と同様な成形方法で図1に示したものと同様の形状のインパネダクト1のサンプルを下記の成形条件で発泡ブロー成形した。
樹脂Bは、低密度ポリエチレン系樹脂(住友化学(株)製スミカセンG201F(密度=0.919g/cm3、MFR=1.7g/10min,190℃、重合法=オートクレーブ法)である。
樹脂Aを50質量部、樹脂Bを50質量部のブレンド比率により計算した樹脂材料のMFR(190℃、g/10分)は、1.00である。ブレンド比率により計算した樹脂材料のMFRは、樹脂AのMFR(0.3)をブレンド比率(50%)で算出した値(0.3×50/100=0.15)と、樹脂BのMFR(1.7)をブレンド比率(50%)で算出した値(1.7×50/100=0.85)と、を加算した値(0.15+085=1.00)である。
成形条件
パリソンの外径:120mm
ダイの出口における樹脂温度:172℃
パリソンの肉厚:5mm
インパネダクト1の平均肉厚0.5mm
また、成形されたインパネダクト1の発泡倍率は、4.3倍であった。
また、成形されたインパネダクト1のダクト内面の表面粗さRmaxは、200μm以下であり、表面粗さは良好(○)であった。
また、成形されたインパネダクト1を分割金型12a,12bから取り出す際に、インパネダクト1を構成する発泡樹脂が分割金型12a,12bに貼り付くことがなく、インパネダクト1を分割金型12a,12bから容易に取り出すことができ、取出性は良好(○)であった。
また、成形されたインパネダクト1のバリを容易に取り除くことができ、バリ取り性は良好(○)であった。
発泡倍率は、インパネダクト1を成形する際に用いた発泡樹脂の密度を、成形されたインパネダクト1の管本体X1(図3参照)における見かけ密度で割った値を発泡倍率とした。
表面粗さRmaxは、表面粗さ測定機(株式会社東京精密製サーフコム470A)を用いて計測した最大高さを示す。表面粗さの測定部位は、インパネダクト1のダクト内面の全ての領域とした。表面粗さの評価方法は、全ての領域においてRmaxが200μm以下の場合に良好(○)とした。また、Rmaxが200μmより高い部分が存在する場合に不良(×)とした。
取出性の評価方法は、ブロー成形後に、インパネダクト1の上部に形成されるバリを所定の機械(クリップ等)で掴んだ状態で分割金型12a,12bを開いてインパネダクト1を分割金型12a,12bの間から取り出す際に、インパネダクト1を構成する発泡樹脂が分割金型12a,12bに貼り付くことがなく、インパネダクト1を分割金型12a,12bから容易に取り出すことができた場合は良好(○)とした。また、分割金型12a,12bを開いてインパネダクト1を分割金型12a,12bの間から取り出す際に、インパネダクト1を構成する発泡樹脂が分割金型12a,12bに貼り付き、分割金型12a,12bの移動に伴いインパネダクト1も所定の距離以上移動した場合は不良(×)とした。また、分割金型12a,12bに発泡樹脂が残った場合も不良(×)とした。なお、インパネダクト1の上部に形成されるバリとは、分割金型12a,12bを型締めした状態で分割金型12a,12bの上部から突出した発泡樹脂の部分である。
バリ取り性の評価方法は、分割金型12a,12bから取り出したインパネダクト1の周囲に形成されるバリの一部にカッター等で切り込みを入れて手などを使ってバリを取り除く際に、バリをインパネダクト1から容易に取り除くことができた場合は良好(○)とした。また、バリを取り除く際に、バリがちぎれてインパネダクト1に残ってしまったり、バリを取り除く際にインパネダクト1が変形してしまったりした場合は不良(×)とした。バリは、インパネダクト1のパーティングラインの周囲に形成される部分であり、インパネダクト1とバリとの間にはピンチオフにより形成した薄肉部分が存在し、その薄肉部分でバリを切除することになる。
インパネダクト1の原料樹脂として、樹脂Aを60質量部、樹脂Bを40質量部で溶融混練した発泡樹脂とした以外は、実施例1と同様にしてインパネダクト1を成形した。
樹脂Aを60質量部、樹脂Bを40質量部のブレンド比率により計算した樹脂材料のMFR(190℃、g/10分)は、0.86である。
また、成形されたインパネダクト1の発泡倍率は、3.9倍であった。
また、表面粗さ、取出性、バリ取り性は何れも良好(○)であった。
インパネダクト1の原料樹脂として、樹脂Aを70質量部、樹脂Bを30質量部で溶融混練した発泡樹脂とした以外は、実施例1と同様にしてインパネダクト1を成形した。
樹脂Aを70質量部、樹脂Bを30質量部のブレンド比率により計算した樹脂材料のMFR(190℃、g/10分)は、0.72である。
また、成形されたインパネダクト1の発泡倍率は、2.8倍であった。
また、表面粗さ、取出性、バリ取り性は何れも良好(○)であった。
インパネダクト1の原料樹脂として、樹脂Aを80質量部、樹脂Bを20質量部で溶融混練した発泡樹脂とした以外は、実施例1と同様にしてインパネダクト1を成形した。
樹脂Aを80質量部、樹脂Bを20質量部のブレンド比率により計算した樹脂材料のMFR(190℃、g/10分)は、0.58である。
また、成形されたインパネダクト1の発泡倍率は、2.2倍であった。
また、表面粗さ、取出性、バリ取り性は何れも良好(○)であった。
インパネダクト1の原料樹脂として、樹脂Aを90質量部、樹脂Bを10質量部で溶融混練した発泡樹脂とした以外は、実施例1と同様にしてインパネダクト1を成形した。
樹脂Aを90質量部、樹脂Bを10質量部のブレンド比率により計算した樹脂材料のMFR(190℃、g/10分)は、0.44である。
また、成形されたインパネダクト1の発泡倍率は、1.6倍であった。
また、表面粗さ、取出性、バリ取り性は何れも良好(○)であった。
インパネダクト1の原料樹脂として、樹脂Aを60質量部、樹脂Cを40質量部で溶融混練した発泡樹脂とした以外は、実施例1と同様にしてインパネダクト1を成形した。
樹脂Cは、低密度ポリエチレン系樹脂(Schulman製CP763(密度=0.919g/cm3、MFR=1.8g/10min,190℃、重合法=チューブラー法)である。
樹脂A、樹脂Cを溶融混練した発泡樹脂のMFR(190℃、g/10分)は、0.9であった。
樹脂Aを60質量部、樹脂Cを40質量部のブレンド比率により計算した樹脂材料のMFR(190℃、g/10分)は、0.90である。
また、成形されたインパネダクト1の発泡倍率は、1.6倍であった。
また、表面粗さ、取出性、バリ取り性は何れも良好(○)であった。
インパネダクト1の原料樹脂として、樹脂Aを60質量部、樹脂Dを40質量部で溶融混練した発泡樹脂とした以外は、実施例1と同様にしてインパネダクト1を成形した。
樹脂Dは、低密度ポリエチレン系樹脂(住友化学(株)製スミカセンF108-1(密度=0.921g/cm3、MFR=0.4g/10min,190℃、重合法=チューブラー法)である。
樹脂A、樹脂Dを溶融混練した発泡樹脂のMFR(190℃、g/10分)は、0.34であった。
樹脂Aを60質量部、樹脂Dを40質量部のブレンド比率により計算した樹脂材料のMFR(190℃、g/10分)は、0.34である。
また、成形されたインパネダクト1の発泡倍率は、1.3倍であった。
また、表面粗さ、取出性、バリ取り性は何れも良好(○)であった。
インパネダクト1の原料樹脂として、樹脂Dを100質量部で溶融混練した発泡樹脂とした以外は、実施例1と同様にしてインパネダクト1を成形した。
樹脂Dを100質量部のブレンド比率により計算した樹脂材料のMFR(190℃、g/10分)は、0.40である。
また、成形されたインパネダクト1の発泡倍率は、1.6倍であった。
また、表面粗さ、取出性、バリ取り性は何れも良好(○)であった。
インパネダクト1の原料樹脂として、樹脂Bを100質量部で溶融混練した発泡樹脂とした以外は、実施例1と同様にしてインパネダクト1を成形した。
樹脂Bを100質量部のブレンド比率により計算した樹脂材料のMFR(190℃、g/10分)は、1.70である。
また、成形されたインパネダクト1の発泡倍率は、5.0倍であった。
また、成形されたインパネダクト1のダクト内面の表面粗さRmaxは、200μm以下であり、表面粗さは良好(○)であった。
また、成形されたインパネダクト1を分割金型12a,12bから取り出す際に、インパネダクト1を構成する発泡樹脂が分割金型12a,12bに貼り付き、インパネダクト1を分割金型12a,12bから容易に取り出すことができず、取出性は不良(×)であった。
また、成形されたインパネダクト1のバリを容易に取り除くことができず、バリ取り性は不良(×)であった。
インパネダクト1の原料樹脂として、樹脂Eを60質量部、樹脂Bを40質量部で溶融混練した発泡樹脂とした以外は、実施例1と同様にしてインパネダクト1を成形した。
樹脂Eは、高密度ポリエチレン系樹脂(旭化成ケミカルズ(株)製J240(密度=0.966g/cm3、MFR=5.0g/10min,190℃、重合法=チューブラー法)である。
樹脂Eを60質量部、樹脂Bを40質量部のブレンド比率により計算した樹脂材料のMFR(190℃、g/10分)は、3.68である。
また、成形されたインパネダクト1の発泡倍率は、4.3倍であった。
また、成形されたインパネダクト1のダクト内面の表面粗さRmaxは一部に200μmよりも高い部分が存在し、表面粗さは不良(×)であった。
また、成形されたインパネダクト1を分割金型12a,12bから取り出す際に、インパネダクト1を構成する発泡樹脂が分割金型12a,12bに貼り付き、インパネダクト1を分割金型12a,12bから容易に取り出すことができず、取出性は不良(×)であった。
また、成形されたインパネダクト1のバリを容易に取り除くことができず、バリ取り性は不良(×)であった。
また、高密度ポリエチレン系樹脂と低密度ポリエチレン系樹脂とを混合した発泡樹脂を用いることで、発泡倍率の高いインパネダクト1を得ることができると判明した。
また、オートクレーブ法で製造したポリエチレン系樹脂を混合した発泡樹脂を用いることで、発泡倍率の高いインパネダクト1を得ることができると判明した。
また、MFRが1.0~3.0の低密度ポリエチレン系樹脂を用いて、成形されたインパネダクト1のMFRが0.8未満、または、ブレンド比率により計算した樹脂材料のMFRが1.0以下となるようにすることで、インパネダクト1の表面粗さ、取出性、バリ取り性が全て良好なインパネダクト1を得ることが判明した。
101 管部
102 嵌め合い部
103 フランジ部
104 橋渡し部
105 供給部
107 固定用孔
100、111 開口部
10a、10b キャビティ
11 環状ダイス
12a、12b 分割金型
13 発泡パリソン
14 吹き込み針
15 吹き出し針
16 レギュレータ
17 背圧レギュレータ
A,B,C,F 流路方向
20 油圧モーター
21 ホッパ
22 シリンダ
24 アキュムレータ
26 プランジャー
28 Tダイ
29 ダイボルト
30 調整ローラ
50 押出装置
X1 管本体
Y1 板状部分
Z 型締めによる押圧力
Claims (5)
- ポリエチレン系樹脂を溶融混練した発泡樹脂を分割金型で型締めして成形した発泡成形体であって、
成形した前記発泡成形体のMFR(190℃、g/10分)が0.8未満である、ことを特徴とする発泡成形体。 - ポリエチレン系樹脂を溶融混練した発泡樹脂を分割金型で型締めして成形した発泡成形体であって、
前記ポリエチレン系樹脂のMFR(190℃、g/10分)が1.0以下である、ことを特徴とする発泡成形体。 - 前記発泡樹脂は、第1のポリエチレン系樹脂と、第2のポリエチレン系樹脂と、を前記第1のポリエチレン系樹脂:前記第2のポリエチレン系樹脂=X:Yの混合割合で形成し(但し、X+Y=100とする)、
前記第1のポリエチレン系樹脂のMFRと、前記第2のポリエチレン系樹脂のMFRと、を前記混合割合で計算して得られるMFRが以下の式1を満足する、ことを特徴とする請求項1または請求項2記載の発泡成形体。
A×X/100+B×Y/100≦1.0・・・式1
Aは、前記第1のポリエチレン系樹脂のMFR
Bは、前記第2のポリエチレン系樹脂のMFR
Xは、前記発泡樹脂を形成する前記第1のポリエチレン系樹脂の混合割合
Yは、前記発泡樹脂を形成する前記第2のポリエチレン系樹脂の混合割合 - 前記第1のポリエチレン系樹脂は、高密度ポリエチレン系樹脂であり、
前記第2のポリエチレン系樹脂は、低密度ポリエチレン系樹脂である、ことを特徴とする請求項3記載の発泡成形体。 - 前記低密度ポリエチレン系樹脂は、オートクレーブ法で製造したものである、ことを特徴とする請求項4記載の発泡成形体。
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EP3339357A4 (en) * | 2015-08-18 | 2018-06-27 | Kyoraku Co., Ltd. | Foam molding resin and method for manufacturing foam molded article |
CN107849282B (zh) * | 2015-08-18 | 2020-07-10 | 京洛株式会社 | 发泡成型用树脂、发泡成型体的制造方法 |
US10988592B2 (en) | 2015-08-18 | 2021-04-27 | Kyoraku Co., Ltd. | Foam molding resin and method for manufacturing foam molded article |
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Publication number | Publication date |
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US11111349B2 (en) | 2021-09-07 |
KR102058745B1 (ko) | 2019-12-23 |
US20160333159A1 (en) | 2016-11-17 |
EP3088452A4 (en) | 2017-08-02 |
JP2015124380A (ja) | 2015-07-06 |
KR20190016606A (ko) | 2019-02-18 |
EP3088452A1 (en) | 2016-11-02 |
CN105849165B (zh) | 2019-03-29 |
US20210363318A1 (en) | 2021-11-25 |
CN110054823A (zh) | 2019-07-26 |
KR102208607B1 (ko) | 2021-01-27 |
JP6331390B2 (ja) | 2018-05-30 |
MX2016008487A (es) | 2016-09-13 |
CN110054823B (zh) | 2022-02-25 |
EP3088452B1 (en) | 2021-09-08 |
KR20160097305A (ko) | 2016-08-17 |
US11608420B2 (en) | 2023-03-21 |
CN105849165A (zh) | 2016-08-10 |
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