WO2017169351A1 - 発泡複合成形体の製造方法、型内発泡成形体ユニット、発泡複合成形体、および発泡複合成形用の金型 - Google Patents
発泡複合成形体の製造方法、型内発泡成形体ユニット、発泡複合成形体、および発泡複合成形用の金型 Download PDFInfo
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- WO2017169351A1 WO2017169351A1 PCT/JP2017/006747 JP2017006747W WO2017169351A1 WO 2017169351 A1 WO2017169351 A1 WO 2017169351A1 JP 2017006747 W JP2017006747 W JP 2017006747W WO 2017169351 A1 WO2017169351 A1 WO 2017169351A1
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- WIPO (PCT)
- Prior art keywords
- mold
- molded body
- insert material
- foam
- exposed
- Prior art date
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 143
- 238000000465 moulding Methods 0.000 title claims abstract description 87
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 238000005187 foaming Methods 0.000 title claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 155
- 229920002635 polyurethane Polymers 0.000 claims abstract description 24
- 239000004814 polyurethane Substances 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 239000006260 foam Substances 0.000 claims description 261
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 65
- 239000011496 polyurethane foam Substances 0.000 claims description 65
- 229920005992 thermoplastic resin Polymers 0.000 claims description 16
- 238000000034 method Methods 0.000 abstract description 49
- 239000002245 particle Substances 0.000 description 27
- 229920005672 polyolefin resin Polymers 0.000 description 18
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- 239000002184 metal Substances 0.000 description 15
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000010097 foam moulding Methods 0.000 description 8
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- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
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- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
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- 239000004793 Polystyrene Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 239000004917 carbon fiber Substances 0.000 description 1
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- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
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- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
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- 239000003063 flame retardant Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
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- 238000003780 insertion Methods 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
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- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical group [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical class O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
- A47C27/14—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/02—Seat parts
- A47C7/18—Seat parts having foamed material included in cushioning part
- A47C7/20—Seat parts having foamed material included in cushioning part with reinforcement in the foam layer
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
- B29C33/14—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels against the mould wall
- B29C33/16—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels against the mould wall using magnetic means
-
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/26—Moulds or cores
- B29C39/28—Moulds or cores with means to avoid flashes
-
- 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
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/1271—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed parts being partially covered
-
- 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
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
- B29C44/1285—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being foamed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/70—Upholstery springs ; Upholstery
- B60N2/7017—Upholstery springs ; Upholstery characterised by the manufacturing process; manufacturing upholstery or upholstery springs not otherwise provided for
-
- 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
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
-
- 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
-
- 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
- B29K2105/048—Expandable particles, beads or granules
-
- 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
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
-
- 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
- B29L2031/3005—Body finishings
-
- 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
- B29L2031/771—Seats
Definitions
- the present invention relates to a method for producing a foam composite molded body, an in-mold foam molded body unit, a foam composite molded body, and a mold for foam composite molding.
- a vehicle seat is generally produced by integrally molding a metal wire as an insert material for stabilizing the shape into a seat body made of polyurethane foam in an embedded shape.
- Patent Documents 1 and 2 Polyurethane foam integral molding technology is disclosed in Patent Documents 1 and 2, for example.
- Patent Document 1 discloses an integral molding technique of polyurethane foam and synthetic resin fiber.
- a magnetic fiber is attached to a synthetic resin fiber with an adhesive, and the synthetic resin fiber is fixed to a magnet installed in a die for integral molding. Then, with the synthetic resin fiber fixed to the magnet, a polyurethane liquid is introduced into the mold to integrally mold the polyurethane foam and the synthetic resin fiber.
- Patent Document 2 discloses a technique for integrally molding a polyurethane foam and a metal wire.
- a metal wire is fixed to a magnet installed in a die for integral molding.
- the in-mold foam molded body unit is obtained by insert molding an insert material (for example, a metal wire) into an in-mold foam molded body made of foamed particles of a thermoplastic resin (for example, an olefin resin).
- the in-mold foam molded body unit is used as a vehicle seat core.
- An in-mold foam molded body unit and a polyurethane foam are integrally molded and covered with a seat cover to provide a vehicle seat.
- the in-mold foam molded body unit when the in-mold foam molded body unit is disposed in the mold for foam composite molding, a gap is generated between the in-mold foam molded body unit and the foam composite mold, and the gap In some cases, polyurethane liquid and polyurethane foam may invade. As a result, an unnecessary polyurethane foam is formed between the in-mold foam molded body unit and the mold for foam composite molding, making it difficult to attach the foam composite molded body to the vehicle body, or foam composite molding. There is a problem that it is necessary to remove unnecessary polyurethane foam existing between the body and the body.
- Patent Documents 1 and 2 are not techniques related to integral molding of the in-mold foam molded body unit and the polyurethane foam.
- the present invention has been made in view of the above-mentioned problems, and its purpose is to produce a foamed composite molded body capable of preventing unnecessary polyurethane foam from being molded in unintended locations, and in-mold foaming.
- the object is to realize a molded body unit, a foamed composite molded body, and a mold for foamed composite molding.
- a method for producing a foamed composite molded body includes an insert material inserted into an in-mold foam molded body made of a thermoplastic resin, and at least a part of the insert material.
- the method includes a fixing step of fixing the portion with a fixing portion provided in the mold, and an introduction step of introducing a polyurethane liquid into the mold.
- the “mold” means a mold for foam composite molding.
- an in-mold foam molded body unit is an in-mold foam molded body in which an insert material is insert-molded in an in-mold foam molded body made of a thermoplastic resin.
- the unit is arranged in a mold, at least a part of the insert material is exposed from the in-mold foam-molded body at least on the side in contact with the mold in the in-mold foam-molded body. It is a feature.
- the foamed composite molded article according to still another aspect of the present invention is an in-mold foam molded article unit in which an insert material is insert-molded in an in-mold foam molded article made of a thermoplastic resin. And a foam composite molded body in which polyurethane foam is integrated, wherein the in-mold foam molded body has an exposed surface, and on the exposed surface side of the in-mold foam molded body, at least the insert material It is characterized by a part being exposed to the outside.
- a mold for foam composite molding has an insert material inserted into an in-mold foam molded body made of a thermoplastic resin.
- an in-mold foam molded body unit and polyurethane foam are integrated by disposing an in-mold foam molded body unit in which at least a part of the insert material is exposed from the in-mold foam molded body.
- a mold for foam composite molding comprising: a fixing portion that fixes the exposed insert material at a position facing the exposed portion of the insert material when the in-mold foam molded body unit is disposed. It is characterized by that.
- (A) is sectional drawing which shows the characteristic on a structure of the foaming composite molding manufactured by the manufacturing method which concerns on Embodiment 1 of this invention, and shows the structure of a bottomed hole vicinity
- (b) is this It is sectional drawing which shows the structure of the modification of the foaming composite molded object which concerns on Embodiment 1 of invention.
- (A) is a cross-sectional view showing a method for producing a foamed composite molded article according to Embodiment 2 of the present invention, and (b) to (d) are modified examples of the position fixing portion shown in (a). It is sectional drawing which shows schematic structure.
- FIG. 8 is a cross-sectional view showing the structural characteristics of a foamed composite molded body manufactured by a molding method using the in-mold foam molded body unit shown in FIG. 7B as a core material.
- FIG. 3 is a schematic view schematically showing a molding method of a foamed composite molded body of Comparative Example 1 and Examples 1 to 3.
- FIG. 1 is an external view of a foamed composite molded body used in the present embodiment as viewed from the side.
- the foamed composite molded body 1 is a molded body in which a polyurethane foam 2 and an in-mold foam molded body unit 5 are integrally molded.
- the in-mold foam molded body unit 5 includes an insert material 3 and an in-mold foam molded body made of thermoplastic resin foam particles.
- the in-mold foam foam made of polyolefin resin foam particles is used.
- the molded body 4 and the insert material 3 are integrally formed.
- the polyurethane foam 2 is formed on at least the surface of the in-mold foam molded body 4 opposite to the mounting side on the vehicle. It is preferable that it is not formed on this surface.
- the insert material 3 is inserted into the in-mold foam molded body 4.
- the insert material 3 is made of a material having higher strength against breakage (tensile strength) than the in-mold foam molded body 4, that is, a material harder than the in-mold foam molded body 4 or softer than the in-mold foam molded body 4.
- Various materials can be used as long as they are not severed.
- the insert material 3 is preferably a material having high affinity with the polyurethane foam 2.
- a metal, inorganic fiber (carbon fiber, glass fiber, etc.), fiber reinforced plastic (carbon fiber reinforced plastic, glass fiber reinforced plastic, etc.), fiber reinforced metal, wood, concrete can be mentioned.
- the insert material 3 is a metal wire. Examples of the metal constituting the insert material 3 include iron, stainless steel, zinc, and aluminum.
- the base resin constituting the expanded particles is not particularly limited, and examples thereof include polyolefin resins, polystyrene resins, styrene modified polyolefin resins (olefin modified polystyrene resins), polyester resins, and the like.
- polyolefin resin polystyrene resins, styrene modified polyolefin resins (olefin modified polystyrene resins), polyester resins, and the like.
- polyolefin resin olefin resin such as styrene-modified polyolefin resin, most preferably polyolefin resin is used, so that buffer properties, chemical resistance, heat resistance, and compression strain are obtained. It is preferable from the viewpoint of easy recovery and recycling.
- the polyolefin resin is not particularly limited, and examples thereof include a polypropylene resin and a polyethylene resin.
- polypropylene resins include propylene homopolymers, ethylene / propylene copolymers, ethylene / propylene / 1-butene copolymers.
- polyethylene resins include ethylene homopolymers, high density polyethylene resins, medium density polyethylene resins, low density polyethylene resins, linear low density polyethylene resins, and more specifically, ethylene / Examples thereof include 1-butene copolymer and ethylene-4-methyl-1-pentene copolymer.
- the copolymer may be a random copolymer or a block copolymer.
- the production method of the expanded particles is not particularly limited, and examples thereof include conventionally known production methods.
- the foamed particles to be produced are polyolefin-based resin foamed particles
- the production methods disclosed in International Publication Nos. WO2009 / 075208, JP-A-2006-117842, and the like can be mentioned.
- the foamed particles to be produced are polystyrene-based resin foamed particles
- the production methods disclosed in JP2003-2013360A, JP2014-118474A, International Patent Publication WO2015 / 137363, and the like can be mentioned. (It is described as “pre-expanded particles” in the patent document).
- the foamed particles to be produced are styrene-modified polyolefin resin foamed particles
- the production methods disclosed in Japanese Patent Application Laid-Open No. 2008-239794, International Patent Publication WO2016 / 152243, and the like can be mentioned.
- the production method of the expanded particles is not limited to these production methods.
- the foamed particles thus obtained can contain or be coated with additives such as flame retardants, antistatic agents, colorants and the like as appropriate by conventionally known methods.
- the particle diameter of the expanded particles is not particularly limited, and may be, for example, 1 mm to 10 mm. However, from the viewpoint of filling into a mold for in-mold foam molding, 1 mm to 5 mm is preferable, and 1 mm to 3 mm is more preferable.
- the expansion ratio of the expanded particles is not particularly limited, and may be, for example, 3 to 90 times, but is preferably 5 to 60 times from the viewpoint of mechanical strength and moldability, and 5 to 45 times. Double is more preferred.
- Such expanded particles are commercially available, for example, as Eperan-PP and Eperan-XL manufactured by Kaneka Corporation, and are easily available.
- the in-mold foam molded body 4 in the present embodiment is hereinafter described as an in-mold foam molded body made of polyolefin resin foam particles for convenience.
- the in-mold foam molded body 4 is molded by heat-foaming and fusing the polyolefin resin foam particles using a mold apparatus for in-mold foam molding. Details will be described below.
- the mold apparatus for in-mold foam molding includes a concave unit having a concave mold and a concave housing that holds the concave mold, and a convex unit having a convex mold and a convex housing that holds the convex mold. .
- a space is formed by the concave mold and the convex mold.
- the space is filled with expanded particles of polyolefin resin.
- the foamed particles may be preliminarily injected with an inorganic gas or the like to increase the internal pressure, or may be foamed particles at atmospheric pressure to which no internal pressure is applied.
- the foamed particles of the polyolefin resin are heated and foamed by supplying a saturated water vapor pressure of about 0.04 to 0.40 MPa (G) into the respective chambers provided in the concave housing and the convex housing, Fuse.
- G saturated water vapor pressure
- the in-mold foam molded body unit 5 has the insert material 3 installed in the convex or concave mold of the mold device for the in-mold foam molded body, and the in-mold foam molded body 4 and the insert material 3 Are integrally molded.
- the in-mold foam molded body unit 5 can be used, for example, as a vehicle seat core.
- the foamed composite molded body 1 has an exposed surface 5a (a contact surface with a mold for foamed composite molding) on which the in-mold foam molded body unit 5 is exposed attached to the vehicle body, and the polyurethane foam 2 is molded.
- the covered surface is covered with a seat cover, thereby being used as a vehicle seat for an automobile or the like.
- FIG. 2 is a plan view showing the configuration of the in-mold foam molded body unit according to Embodiment 1 of the present invention, in which the insert material is exposed through a hole (or hole) formed in the in-mold foam molded body.
- FIG. FIG. 2 is a plan view seen from the exposed surface 5a side.
- a hole 6 is provided in the exposed surface 5 a of the in-mold foam molded body 4, and a part of the insert material 3 is exposed from the hole 6.
- a part of the insert material 3 exposed from the hole 6 comes into contact with a fixing portion provided in a mold for foaming composite molding described later. Thereby, the position of the in-mold foam-molded body 4 in the mold for foam composite molding can be fixed at the time of molding.
- the main object of the present embodiment is to easily prevent the polyurethane foam 2 from entering the exposed surface 5a of the in-mold foam molded body unit 5 when the foam composite molded body 1 is molded.
- the present inventors have determined that the insert material 3 exposed on the exposed surface 5a, which is the contact surface with the mold in the in-mold foam molded body unit 5, is a mold for foam composite molding. If it can be fixed inside, it can be easily suppressed that the polyurethane foam 2 wraps around the exposed surface 5a, and the following manufacturing method has been completed.
- the manufacturing method (molding method) of the foam composite molded body 1 according to the present embodiment is an insert provided on the exposed surface 5a (contact surface with the mold for foam composite molding) in the in-mold foam molded body unit 5.
- FIG. 3A is a cross-sectional view showing a conventional method for forming a foamed composite molded body
- FIG. 3B is a cross-sectional view showing a method for forming the foamed composite molded body 1 according to the present embodiment. is there.
- the hole 6 (see FIG. 2) provided in the in-mold foam molded body 4 is a bottomed hole 6a.
- the in-mold foam molded body unit 5 is disposed in the mold 10 for foam composite molding, at least a part of the insert material 3 is in the mold at least on the side in contact with the mold 10 in the in-mold foam molded body 4. It is exposed from the foamed molded body 4. Part of the insert material 3 is fitted into the bottom of the bottomed hole 6a, that is, the insert material 3 is exposed from the in-mold foam molded body 4 through the bottomed hole 6a.
- in-mold foam molding is first performed in order to integrally mold the in-mold foam molded body unit 5 and the polyurethane foam 2.
- the body unit 5 is placed in a mold 10 for foam composite molding.
- a polyurethane liquid as a raw material of the polyurethane foam 2 is introduced into the mold 10 for foam composite molding (introduction step).
- the polyurethane liquid is foamed by heating the polyurethane liquid to 70 to 150 ° C., and the polyurethane foam 2 is formed.
- the foam composite molded body 1 in which the polyurethane foam 2 and the in-mold foam molded body unit 5 are integrally molded is obtained.
- the in-mold foam molded body unit 5 is manufactured by foam molding of the olefin resin together with the insert material 3 in the mold, some sink marks or warps are formed in the in-mold foam molded body unit 5. End up. For this reason, as shown in FIG. 3 (a), when the conventional in-mold foam molded body unit 5 ′ is placed in the mold 10 ′ for foam composite molding, the in-mold foam molded body unit 5 ′ is exposed. A gap exists between the surface 5′a and the mold 10 ′, and the polyurethane liquid and the polyurethane foam 2 enter through the gap. As a result, the polyurethane foam 2 is molded between the exposed surface 5'a of the in-mold foam molded unit 5 'and the mold 10'.
- the manufacturing method (molding method) of the foam composite molded body 1 according to the present embodiment is such that the exposed portion of the insert material 3 in the in-mold foam molded body unit 5 is a fixed portion provided in the mold 10. And a fixing step of fixing with.
- the fixing portion provided in the mold 10 corresponds to the exposed portion of the insert material 3 in the in-mold foam molded body unit 5.
- the mold 10 is provided with a magnetic body 11 as the fixing portion.
- the magnetic body 11 is preferably a magnet, but may be an electromagnet.
- the material of the magnet is not particularly limited, but is preferably neodymium or samarium cobalt.
- the material of the insert material 3 according to this embodiment is preferably iron that adsorbs to the magnetic body 11 among metal wires.
- the magnetic body 11 is provided at a position facing the insert material 3 exposed on the bottom surface of the bottomed hole 6a formed on the exposed surface 5a when the in-mold foam molded body unit 5 is disposed on the mold 10. Yes. When the in-mold foam molded body unit 5 is disposed in the mold 10, the insert material 3 exposed on the bottom surface of the bottomed hole 6 a comes into contact with the magnetic body 11.
- the exposed portion of the insert material 3 in the in-mold foam molded body unit 5 is magnetically attracted (magnetically attached) by the magnetic body 11. And fixed (fixing step).
- an introducing step of introducing the polyurethane liquid into the mold 10 in a state where the exposed portion of the insert material 3 in the in-mold foam molded body unit 5 is fixed as described above is performed. .
- the contact between the exposed surface 5a of the in-mold foam molded body unit 5 and the mold 10 is maintained by the magnetic adsorption between the insert material 3 and the magnetic body 11, so that the polyurethane liquid and the polyurethane foam 2 are Intrusion between the exposed surface 5a and the mold 10 can be prevented.
- the polyurethane foam 2 it is possible to prevent the polyurethane foam 2 from being molded between the exposed surface 5 a of the in-mold foam molded body unit 5 and the mold 10.
- the exposed part of the insert material 3 in the exposed surface 5a of the in-mold foam molded body unit 5 is provided at a place where a gap between the mold 10 and the exposed surface 5a is assumed to be large. Yes. Thereby, it can suppress efficiently that a polyurethane liquid and the polyurethane foam 2 penetrate
- the polyurethane liquid is applied to the mold 10 ′.
- the position of the in-mold foam molded body unit 5 ′ is shifted in the mold 10 ′ due to the pressure of the polyurethane liquid at the time of introduction.
- the foamed composite molded body 1 according to this embodiment shown in FIG. 3B, after the in-mold foam molded body unit 5 is placed in the mold 10, the in-mold foam molding is performed.
- the position of the body unit 5 is fixed by magnetic adsorption between the exposed portion of the insert material 3 and the magnetic body 11. Therefore, the foamed composite molded body 1 can be molded while suppressing the displacement of the in-mold foam molded body unit 5 in the mold 10.
- the foamed composite molded body 1 with more accurate dimensions can be manufactured.
- a plurality of exposed portions of the insert material 3 are provided on the exposed surface 5 a of the in-mold foam molded body 4. Thereby, it can suppress more efficiently that a polyurethane liquid and the polyurethane foam 2 penetrate
- FIG. A plurality of exposed portions of the insert material 3 may be provided in a concentrated manner when there is one location where a gap between the mold 10 and the exposed surface 5a is assumed to be large. In addition, when there are a plurality of places where the gap between the mold 10 and the exposed surface 5a is assumed to be large, they may be distributed so as to correspond to the assumed places.
- the magnetic body 11 was configured to be magnetically attracted only at the lower end portion of the insert material 3.
- the magnetic body 11 is not particularly limited as long as it can be configured to fix the position of the insert material 3 by magnetic attraction.
- the shape of the magnetic body 11 may have a fitting recess for fitting with the insert material 3.
- the fitting recess may be configured by a plurality of magnetic bodies 11 gathering together.
- the molding method according to the present embodiment is not limited to the in-mold foam molded body unit 5 in which at least a part of the insert material 3 is exposed from the in-mold foam molded body 4 as shown in FIG.
- the present invention is also applicable to the in-mold foam molded body unit exposed from the in-mold foam molded body from the upper end to the lower end of the insert material 3.
- FIG. 4A is a cross-sectional view showing the structural features of the foamed composite molded body 1 manufactured by the manufacturing method according to the present embodiment, and showing the configuration in the vicinity of the bottomed hole 6a.
- the foamed composite molded body 1 has an exposed surface 5a from which the in-mold foam molded body 4 is exposed. At least a part of the insert material 3 is exposed to the outside on the exposed surface 5a side. Specifically, the insert material 3 is exposed from the bottom surface of the bottomed hole 6a.
- the polyurethane foam 2 is formed on the surface opposite to the exposed surface 5a of the in-mold foam molded body 4.
- the insert material 3 exposed on the bottom surface of the bottomed hole 6a is magnetically attracted to the magnetic body of the mold during the introduction step. Therefore, even if the polyurethane foam 2 is molded, the insert material 3 exposed on the bottom surface of the bottomed hole 6a remains exposed.
- FIG. 4B is a cross-sectional view showing a configuration of a modified example of the foamed composite molded body according to the present embodiment.
- a modified foam composite body 1a is different from the foam composite body 1 in that a hole provided in the in-mold foam body 4a is a through hole 6b.
- the in-mold foam molded body unit 5 which is a core material of the foam composite molded body 1a has a configuration in which the insert material 3 is exposed from the in-mold foam molded body 4a through the through hole 6b.
- the through hole 6b penetrates the in-mold foam molded body 4a.
- the insert material 3 has a structure exposed from the in-mold foam molded body 4a from the upper end to the lower end.
- the foam composite molded body 1a is formed by the above-described manufacturing method using such an in-mold foam molded body unit 5 as a core material.
- the foamed composite molded body 1a has an exposed surface 5a in which the upper portion of the insert material 3 exposed from the upper end to the lower end in the through hole 6b contacts the polyurethane foam 2.
- the lower part of the side is exposed to the outside.
- the insert material 3 is a material having high affinity with the polyurethane foam 2 such as metal. Therefore, when the upper portion of the insert material 3 exposed at the through hole 6b is in contact with the polyurethane foam 2, the adhesive strength between the polyurethane foam 2 and the in-mold foam molded body unit 5 can be improved.
- the shape of the magnetic body 11 is not particularly limited, and for example, a cylinder, a cylinder, a prism, a square cylinder, and a sphere can be used. From the viewpoint of ease of installation on the mold 10, a cylindrical shape or a rectangular tube shape is preferable.
- the size of the magnetic body 11 is not particularly limited.
- the diameter of the magnetic body 11 is preferably 1.0 mm or more and 35.0 mm or less, more preferably 5.0 mm or more and 25.0 mm or less, and 8.0 mm or more and 20.0 mm or less. More preferably it is.
- the size of the bottomed hole 6a or the through-hole 6b can be increased as the size of the in-mold foam molded body 4 is increased, there is no upper limit. However, it is preferable that the size is slightly larger than the size of the magnetic body 11 from the viewpoint of easy attachment to the foam composite molding die.
- the diameter of the hole of the bottomed hole 6a or the through hole 6b is preferably 1.5 mm or more and 40.0 mm or less, more preferably 5.5 mm or more and 30.0 mm or less for general purposes. More preferably, it is 8.5 mm or more and 25.0 mm or less.
- the maximum value is obtained with no obstacles in the straight line when two points on the periphery of the hole are connected by a straight line. The part to be taken is considered as the diameter.
- FIG. 5 is sectional drawing which shows the shaping
- FIG. 6 is a cross-sectional view showing the structural features of the foamed composite molded body 1A manufactured by the molding method of FIG.
- the mold 10A used in the method for forming a foamed composite molded body according to this embodiment includes a position fixing portion 12.
- the position fixing portion 12 has a fitting recess (fitting portion) 12a that fits with the insert material 3 exposed on the exposed surface 5a of the in-mold foam molded body unit 5A.
- the insert material 3 is separated from the bottom surface of the bottomed hole 6a.
- the insert material 3 is exposed from the in-mold foam molded body 4 from its upper end to its lower end.
- the exposed portion of the insert material 3 in the in-mold foam molded body unit 5A is: It fits and is fixed to the fitting recess 12a (fixing step).
- the introduction step of introducing the polyurethane liquid into the mold 10A is performed in such a state that the exposed portion of the insert material 3 in the in-mold foam molded body unit 5A and the fitting recess 12a are fitted.
- the contact between the exposed surface 5a of the in-mold foam molded body unit 5A and the mold 10A is maintained by the fitting of the insert material 3 and the fitting recess 12a. Can be prevented from entering between the exposed surface 5a and the mold 10A.
- the foamed composite molded body 1A manufactured by the molding method of FIG. 5A has an exposed surface 5a from which the in-mold foam molded body 4 is exposed.
- the insert material 3 is exposed to the outside on the exposed surface 5a side, and more specifically, is exposed separately from the bottom surface of the bottomed hole 6a formed in the exposed surface 5a.
- the polyurethane foam 2 is formed on the surface opposite to the exposed surface 5a of the in-mold foam molded body 4.
- the fitting recess 12a shown in FIG. 5A has the same width at the upper end and the lower end. For this reason, the opening width was the same from the bottom surface at the lower end of the fitting recess 12a to the open portion at the upper end.
- the fitting recessed part 12a in this embodiment will not be specifically limited if it is a structure which can be fitted with the exposed part of the insert material 3. FIG.
- the fitting recess 12a may have a shape in which the bottom width at the lower end is narrower than the opening width at the upper end.
- the fitting recess 12b has a U shape that opens in a tapered shape so that the opening width gradually decreases from the upper end toward the bottom surface at the lower end. Also good.
- the fitting recess 12b has a wall surface that is tapered from the upper end, and the opening width becomes equal in the middle and extends to the lower end. It may be above.
- the position fixing part is not limited to the structure provided with the fitting recess as long as the insert material 3 can be fixed.
- it may be configured to include two leaf spring portions 13a and 13b.
- the leaf spring portions 13a and 13b are urged in a direction in which the mutual distance decreases.
- the insert material 3 is sandwiched between the leaf spring portions 13a and 13b. In this state, the urging forces of the leaf spring portions 13 a and 13 b are locked by the insert material 3.
- a magnetic body that magnetically attracts to the insert material 3 may be provided at least in a portion that contacts the insert material 3 in the fitting recesses 12a to 12c.
- the molding method according to the present embodiment is limited to the in-mold foam molded body unit 5A exposed from the in-mold foam molded body 4 from the upper end to the lower end of the insert material 3 as shown in FIG.
- the present invention can be applied to an in-mold foam molded body unit in which at least a part of the insert material is exposed from the in-mold foam molded body.
- FIG. 7A and 7B are plan views showing the configuration of the in-mold foam molded body unit 5 used in the present embodiment.
- the in-mold foam molded body 4 is divided into two molded body pieces 4A and 4B.
- the insert material 3 is annularly inserted across the two molded body pieces 4A and 4B.
- the insert material 3 is formed from the in-mold foam molded body 4 in the gap between two molded body pieces among the plurality of molded body pieces obtained by dividing the in-mold foam molded body 4. Exposed. At this time, the insert material 3 is exposed at two locations from the in-mold foam molded body 4.
- the in-mold foam molded body 4 may be divided into three or more. That is, three or more molded product pieces when the in-mold foam molded product 4 is divided may be used.
- the in-mold foam molded body unit 5 shown in FIG. 7 (b) is provided with a groove that crosses one of two opposing sides of a square corresponding to the routing of the insert material 3, and the in-mold foam molded body. A part of 4 is cut off. At this time, the insert material 3 is exposed only at one location from the in-mold foam molded body 4. In addition, the structure which formed two or more said grooves in the in-mold foaming molding 4 may be sufficient.
- the separation distance between the molded body piece 4A and the molded body piece 4B when the in-mold foam molded body 4 is divided, or the width of the groove formed in the in-mold foam molded body 4 by cutting a part thereof is defined as a delimiter width.
- a portion having the largest width is set as a separation width.
- the separation width can be increased as the size of the in-mold foam molded body 4 is increased, there is no upper limit on the length of the separation width.
- the separation width is preferably 1.0 mm or more and 150.0 mm or less, more preferably 5.0 mm or more and 30.0 mm or less, and more preferably 5.0 mm or more and 15.15 mm or less. More preferably, it is 0 mm or less.
- FIG. 8 is a cross-sectional view showing a molding method of a foamed composite molded body having the in-mold foam molded body unit 5 shown in FIG. 7A as a core material.
- FIG. 8 is a cross-sectional view corresponding to the cross section taken along line B-B ′ of FIG.
- the mold 10 ⁇ / b> B used in the molding method of the foamed composite molded body according to the present embodiment includes two position fixing portions 12.
- Each of these two position fixing parts 12 has a fitting recess (fitting part) 12a.
- the fitting recesses 12a provided in the two position fixing portions 12 are respectively two inserts exposed in the gap between the two molded body pieces 4A and 4B in the in-mold foam molded body unit 5 shown in FIG. It is configured to be fitted with the material 3.
- the introduction step of introducing the polyurethane liquid into the mold 10B is performed in such a state that the exposed portion of the insert material 3 in the in-mold foam molded body unit 5 and the fitting recess 12a are fitted.
- the contact between the exposed surface of the in-mold foam molded body unit 5 and the mold 10B is maintained by the fitting of the insert material 3 and the fitting recess 12a. Intrusion between the exposed surface and the mold 10B can be prevented. As a result, it is possible to prevent the polyurethane foam 2 from being molded between the exposed surface of the in-mold foam molded body unit 5 and the mold 10B.
- FIG. 9A is a cross-sectional view showing the structural characteristics of the foamed composite molded body 1B manufactured by the molding method using the in-mold foam molded body unit 5 shown in FIG. 7A as a core material.
- FIG. 9B is a cross-sectional view showing the structural characteristics of the foamed composite molded body 1C manufactured by the molding method using the in-mold foam molded body unit 5 shown in FIG. 7B as a core material.
- 9A is a cross-sectional view corresponding to the cross section taken along line BB ′ of FIG. 7A
- FIG. 9B is a cross-sectional view of CC ′ of FIG. 7B. It is sectional drawing corresponding to a line cross section.
- the foamed composite molded body 1B has an exposed surface 5a in the reverse direction of the paper surface in FIG.
- the exposed surface 5a shown in (a) of FIG. 9 is a surface where the molded piece 4B shown in (a) of FIG. 7 is exposed.
- the polyurethane foam 2 when the polyurethane foam 2 is molded by the mold 10B shown in FIG. Therefore, as shown in FIG. 9A, in the foamed composite molded body 1 ⁇ / b> B, the polyurethane foam 2 does not exist in the portion corresponding to the position fixing portion 12, and an opening is provided. And the insert material 3 is exposed from the polyurethane foam 2 in this opening part. In other words, the upper portion of the insert material 3 opposite to the exposed surface 5a is in contact with the polyurethane foam 2, and the lower portion on the exposed surface 5a side is exposed to the outside.
- the foamed composite molded body 1C has an exposed surface 5a where the in-mold foam molded body 4 is exposed, as shown in FIG. 9B.
- the mold for molding the foam composite molded body 1C has a position fixing portion for fixing the exposed portion of the insert material 3 in the in-mold foam molded body unit 5 shown in FIG.
- This position fixing portion has the same configuration as the position fixing portion 12 shown in FIG. Therefore, in the foamed composite molded body 1 ⁇ / b> C, the insert material 3 is exposed from the polyurethane foam 2 at the opening corresponding to the position fixing portion.
- the foamed composite molded bodies 1B and 1C are configured such that at least a part of the insert material 3 is exposed to the outside on the exposed surface 5a side of the foamed molded body.
- the exposed portion of the insert material 3 is a mold for foamed composite molding (10, 10A, 10B).
- the exposed portion of the insert material 3 is preferably provided, for example, in at least a part of the insert material 3 that is entirely inserted into the outer peripheral portion of the exposed surface 5a of the in-mold foam molded body unit 5 (see FIG. 10). Thereby, it can suppress efficiently that a polyurethane liquid and the polyurethane foam 2 penetrate
- the exposed portion of the insert material 3 may be provided so as to protrude from the outer edge portion of the exposed surface of the in-mold foam molded body unit 5.
- the exposed portion of the insert material 3 is at a position where it can be easily magnetically attracted or fitted by the fixing portion of the foam composite molding die (10, 10A, 10B).
- the mold (10, 10A, 10B) for foamed composite molding and the in-mold foam molded body are used.
- Other methods for fixing the unit (5, 5A) may be used in combination.
- a hook portion is provided on the exposed insert material 3 in the in-mold foam molded body unit (5, 5A), and the hook portion and the mold for foam composite molding (10, 10A, 10B) are provided.
- an opening is provided in the in-mold foam molded body unit (5, 5A), and an insertion portion that engages with the opening is provided in the mold (10, 10A, 10B).
- a method of fixing the molding die (10, 10A, 10B) and the in-mold foam molded body unit (5, 5A) may be used.
- an insert material is insert-molded into an in-mold foam molded body made of a thermoplastic resin, and at least a part of the insert material is formed from the in-mold foam molded body.
- the exposed portion of the insert material in the in-mold foam molded body unit is fixed by the fixing portion provided in the mold. And after fixing the exposed part of the said insert material to the said metal mold
- the insert material is (1) a bottomed hole formed in the in-mold foam molded body (2) formed in the in-mold foam molded body.
- Through holes (3) a gap between two molded body pieces among a plurality of molded body pieces obtained by dividing the in-mold foam molded body, and (4) the outer surface of the in-mold foam molded body.
- the structure exposed from the said in-mold foaming molding body may be sufficient as at least 1 selected from the group which consists of circumference
- At least a part of the insert material integrated with the in-mold foam molded body can be easily exposed from the in-mold foam molded body.
- the exposed portion of the insert material may be fixed by a plurality of fixing portions provided in the mold.
- the exposed portion of the insert material in the in-mold foam molded body unit is magnetically attracted to a magnetic body provided in the fixed portion. You may fix by doing.
- the exposed portion of the insert material in the in-mold foam molded body unit is fitted into a fitting portion provided in the fixed portion. It may be fixed by combining them.
- die is maintained by fitting with the exposed part of the said insert material, and the said fitting part. Therefore, the polyurethane liquid can be prevented from entering between the contact surface and the mold.
- An in-mold foam-molded body unit is an in-mold foam-molded body unit in which an insert material is insert-molded into an in-mold foam-molded body made of a thermoplastic resin, and is disposed in a mold. In this case, at least a part of the insert material is exposed from the in-mold foam-molded body at least on the side in contact with the mold in the in-mold foam-molded body.
- the in-mold foam molded body unit having the above configuration to the method for manufacturing a foamed composite molded body according to an embodiment of the present invention, it is possible to prevent unnecessary polyurethane foam from being molded in unintended locations. it can.
- a foamed composite molded body is a foamed composite in which an in-mold foam molded body unit in which an insert material is insert-molded into an in-mold foam molded body made of a thermoplastic resin and a polyurethane foam are integrated.
- the exposed surface in the foamed composite molded body according to an embodiment of the present invention is formed by forming a contact surface with a mold in the in-mold foamed molded unit when molding the foamed composite molded body.
- the exposed portion of the insert material provided on the contact surface (exposed surface) with the mold in the in-mold foam molded body unit is fixed. Molded in a state of being fixed by the part. Therefore, the foamed composite molded body according to an embodiment of the present invention has an exposed surface from which the in-mold foam molded body is exposed, and on the exposed surface side of the in-mold foam molded body, at least one of the insert materials. Is exposed to the outside.
- an insert material is insert-molded in an in-mold foam molded body made of a thermoplastic resin, and at least a part of the insert material is in the mold.
- a fixing portion for fixing the exposed insert material is provided at a position facing the exposed portion of the insert material when the in-mold foam molded body unit is disposed.
- FIG. 10 is a schematic view schematically showing a molding method of the foamed composite molded body 1 of Comparative Example 1 and Examples 1 to 3.
- the polyolefin resin foamed particles were manufactured by Kaneka Corporation, L-EPP36 (ethylene-propylene random copolymer, bulk density 20 g / L, melting point 146 ° C., impregnated with pressurized air in a pressure-resistant container to adjust the internal pressure. About 0.1 MPa (G)) was used.
- In-mold foam molded body 4 (length 1300.0 mm ⁇ width 600.0 mm ⁇ thickness 150.0 mm) is inserted with a rectangular annular insert material 3 (iron, diameter 4.5 mm, length 1200.0 mm ⁇ width 500.0 mm).
- the magnetic body 11 (neodymium magnet manufactured by Magfine Co., Ltd.
- the polyurethane foam 2 was integrally molded without fixing the exposed portion of the insert material 3 with a countersunk round shape (diameter 20.0 mm).
- Example 1 In-mold foam molded body 4 (length 1300.0 mm ⁇ width 600.0 mm ⁇ thickness 150.0 mm) is inserted with a rectangular annular insert material 3 (iron, diameter 4.5 mm, length 1200.0 mm ⁇ width 500.0 mm).
- the magnetic body 11 (neodymium magnet manufactured by Magfine Co., Ltd.
- the polyurethane foam 2 was integrally molded by fixing one exposed portion of the insert material 3 with a countersunk round shape (diameter 20.0 mm).
- the circles in FIG. 10 indicate the places where the magnetic body 11 is fixed.
- one of the two long sides of the rectangular ring formed by the insert material 3 is fixed by the magnetic body 11.
- Example 2 The foamed composite molded body 1 was molded in the same manner as in Example 1 except that the number of fixing portions of the exposed portion of the insert material 3 by the magnetic body 11 was changed to two. As shown in FIG. 10, in Example 2, both of two rectangular short sides formed by the insert material 3 are fixed by the magnetic body 11.
- Example 3 The foamed composite molded body 1 was molded in the same manner as in Example 1 except that the number of fixing portions of the exposed portion of the insert material 3 by the magnetic body 11 was changed to three. As shown in FIG. 10, in Example 2, both of the two rectangular short sides and one of the two long sides of the insert material 3 are fixed by the magnetic body 11.
- Example 4 The foamed composite molded body 1 was molded in the same manner as in Example 1 except that the number of fixing portions of the exposed portion of the insert material 3 by the magnetic body 11 was ten.
- Evaluation criteria for urethane wrapping ⁇ : The wraparound length is 20.0 mm or less at all wraparound locations ⁇ : Locations where the wraparound length exceeds 20.0 mm are 1 to 2 ⁇ : Locations where the wraparound length exceeds 20.0 mm However, there are three places ⁇ : four or more places where the wraparound length is more than 20.0 mm Evaluation criteria for positional deviation in the mold 10 Relative of the in-mold foam molded body unit 5 in the produced foamed composite molded body Using the positional relationship as an index, the positional deviation of the in-mold foam molded body unit 5 in the mold 10 was visually evaluated. Then, the evaluation was made in three stages of x, ⁇ , and o in order from the one with the largest degree of positional deviation to the one with the smallest degree of positional deviation.
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Abstract
Description
図1は、本実施形態に用いられる発泡複合成形体を側面から見た外観図である。
発泡複合成形体1の成形方法(製造方法)について、図3を参照しながら説明する。図3の(a)は、従来の発泡複合成形体の成形方法を示す断面図であり、図3の(b)は、本実施形態に係る発泡複合成形体1の成形方法を示す断面図である。
上述の製造方法により製造された発泡複合成形体1の構成上の特徴について、図4の(a)に基づいて説明する。図4の(a)は、本実施形態に係る製造方法により製造された発泡複合成形体1の構成上の特徴を示し、有底孔6a近傍の構成を示す断面図である。
本発明の他の実施形態について説明すれば、以下のとおりである。なお、説明の便宜上、前記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
本発明のさらに他の実施形態について説明すれば、以下のとおりである。なお、説明の便宜上、前記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。図7の(a)及び(b)は、本実施形態にて使用される型内発泡成形体ユニット5の構成を示す平面図である。
本発明の一実施形態に係る発泡複合成形体の製造方法は、熱可塑性樹脂からなる型内発泡成形体にインサート材がインサート成形され、前記インサート材の少なくとも一部が前記型内発泡成形体から露出した型内発泡成形体ユニットと、ポリウレタンフォームと、が一体化した発泡複合成形体の製造方法であって、前記型内発泡成形体ユニットにおける前記インサート材の露出部分を、金型内に設けられた固定部にて固定する固定工程と、前記金型にポリウレタン液を導入する導入工程と、を含むことを特徴としている。
型内発泡成形体4(縦1300.0mm×横600.0mm×厚さ150.0mm)に矩形環状のインサート材3(鉄製、直径4.5mm、縦1200.0mm×横500.0mm)がインサート成形され、露出面(直径22.0mmの有底孔)にてインサート材3の一部が露出した型内発泡成形体ユニット5を芯材として、磁性体11(株式会社マグファイン製ネオジム磁石、皿穴付丸型形状、直径20.0mm)によりインサート材3の露出部分を固定せずに、ポリウレタンフォーム2を一体成形した。
型内発泡成形体4(縦1300.0mm×横600.0mm×厚さ150.0mm)に矩形環状のインサート材3(鉄製、直径4.5mm、縦1200.0mm×横500.0mm)がインサート成形され、露出面(直径22.0mmの有底孔)にてインサート材3の一部が露出した型内発泡成形体ユニット5を芯材として、磁性体11(株式会社マグファイン製ネオジム磁石、皿穴付丸型形状、直径20.0mm)によりインサート材3の露出部分を1か所固定して、ポリウレタンフォーム2を一体成形した。図10の○は、磁性体11による固定箇所を示す。図10に示されるように、実施例1では、インサート材3が構成する矩形環状の2つの長辺の一方を磁性体11により固定している。
磁性体11によるインサート材3の露出部分の固定箇所を2か所とした以外、実施例1と同様に、発泡複合成形体1を成形した。図10に示されるように、実施例2では、インサート材3が構成する矩形環状の2つの短辺の両方を磁性体11により固定している。
磁性体11によるインサート材3の露出部分の固定箇所を3か所とした以外、実施例1と同様に、発泡複合成形体1を成形した。図10に示されるように、実施例2では、インサート材3が構成する矩形環状の2つの短辺の両方及び2つの長辺の一方を磁性体11により固定している。
磁性体11によるインサート材3の露出部分の固定箇所を10か所とした以外、実施例1と同様に、発泡複合成形体1を成形した。
◎:回り込み箇所のすべてで回り込み長さが20.0mm以下
○:回り込み長さが20.0mm超の箇所が、1~2箇所
△:回り込み長さが20.0mm超の箇所が、3箇所
×:回り込み長さが20.0mm超の箇所が、4箇所以上
金型10での位置ずれの評価基準
作製した発泡複合成形体内での型内発泡成形体ユニット5の相対的な位置関係を指標に、金型10での型内発泡成形体ユニット5の位置ずれを目視にて評価した。そして、位置ずれの度合いが大きいものから位置ずれの度合いが小さいものへ順に、×、△、○の3段階で評価した。
2 ポリウレタンフォーム
3 インサート材
4、4a 型内発泡成形体
4A、4B 成形体片
5、5A 型内発泡成形体ユニット
5a 露出面
6a 有底孔
6b 貫通孔
10、10A、10B 金型(発泡複合成形用の金型)
11 磁性体(固定部)
12 位置固定部(固定部)
12a 嵌合凹部(嵌合部)
Claims (8)
- 熱可塑性樹脂からなる型内発泡成形体にインサート材がインサート成形され、前記インサート材の少なくとも一部が前記型内発泡成形体から露出した型内発泡成形体ユニットと、ポリウレタンフォームと、が一体化した発泡複合成形体の製造方法であって、
前記型内発泡成形体ユニットにおける前記インサート材の露出部分を、金型内に設けられた固定部にて固定する固定工程と、
前記金型にポリウレタン液を導入する導入工程と、を含むことを特徴とする発泡複合成形体の製造方法。 - 前記インサート材は、
(1)前記型内発泡成形体に形成された有底孔
(2)前記型内発泡成形体に形成された貫通孔
(3)前記型内発泡成形体が区分けされて得られた複数の成形体片のうち2つの成形体片の間の隙間、および、
(4)前記型内発泡成形体の外面の周囲
からなる群より選択される少なくとも1つにて、前記型内発泡成形体から露出していることを特徴とする請求項1に記載の発泡複合成形体の製造方法。 - 前記固定工程では、前記金型内に設けられた複数の固定部にて、前記インサート材の露出部分を固定することを特徴とする請求項1または2に記載の発泡複合成形体の製造方法。
- 前記固定工程では、前記型内発泡成形体ユニットにおける前記インサート材の露出部分を、前記固定部に設けられた磁性体に磁気吸着させることにより固定することを特徴とする請求項1~3の何れか1項に記載の発泡複合成形体の製造方法。
- 前記固定工程では、前記型内発泡成形体ユニットにおける前記インサート材の露出部分を、前記固定部に設けられた嵌合部に嵌合させることにより固定することを特徴とする請求項1~4の何れか1項に記載の発泡複合成形体の製造方法。
- 熱可塑性樹脂からなる型内発泡成形体にインサート材がインサート成形された型内発泡成形体ユニットであって、
金型内に配置されたとき、少なくとも前記型内発泡成形体における金型と接触する側において前記インサート材の少なくとも一部が前記型内発泡成形体から露出していることを特徴とする型内発泡成形体ユニット。 - 熱可塑性樹脂からなる型内発泡成形体にインサート材がインサート成形された型内発泡成形体ユニットと、ポリウレタンフォームとが一体化された発泡複合成形体であって、
前記型内発泡成形体が露出した露出面を有し、
前記型内発泡成形体における露出面側では、前記インサート材の少なくとも一部が外部に露出していることを特徴とする発泡複合成形体。 - その内部に、熱可塑性樹脂からなる型内発泡成形体にインサート材がインサート成形され、前記インサート材の少なくとも一部が前記型内発泡成形体から露出した型内発泡成形体ユニットを配置し型内発泡成形体ユニットとポリウレタンフォームとが一体化された発泡複合成形体を製造するための発泡複合成形用の金型であって、
前記型内発泡成形体ユニットが配置されたときに、前記インサート材の露出部分と対向する位置に、露出した前記インサート材を固定する固定部を備えたことを特徴とする発泡複合成形用の金型。
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