WO2013121941A1 - 金型、発泡成形体の製造方法及び発泡成形体 - Google Patents
金型、発泡成形体の製造方法及び発泡成形体 Download PDFInfo
- Publication number
- WO2013121941A1 WO2013121941A1 PCT/JP2013/052675 JP2013052675W WO2013121941A1 WO 2013121941 A1 WO2013121941 A1 WO 2013121941A1 JP 2013052675 W JP2013052675 W JP 2013052675W WO 2013121941 A1 WO2013121941 A1 WO 2013121941A1
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- WIPO (PCT)
- Prior art keywords
- mold
- reinforcing material
- cavity
- parting line
- seat pad
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- 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
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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
- 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
-
- 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
- B29C33/0038—Moulds or cores; Details thereof or accessories therefor with sealing means or the like
-
- 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
- B29C44/14—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being a lining
- B29C44/143—Means for positioning the lining in the mould
-
- 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
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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
- B29K2101/00—Use of unspecified macromolecular compounds 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
- B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
Definitions
- the present invention provides a mold for producing a foamed molded body in which a reinforcing material is disposed along at least a part of the outer surface of a molded body main body made of a foamed synthetic resin, and the reinforcing material is integrated with the molded body main body.
- the foamed synthetic resin raw material is foamed in the cavity, thereby forming the molded body, and the reinforcing material and the molded body. It is related with the metal mold
- the present invention relates to a method for producing a foamed molded using the mold, and a foamed article produced by this production method.
- a vehicle seat or a seat such as a sofa installed in a house is configured using a seat pad made of a foamed synthetic resin such as a soft polyurethane foam or a semi-rigid polyurethane foam.
- FIG. 10 is a cross-sectional view showing a conventional example of the seat pad with a reinforcing material
- FIG. 11 is a cross-sectional view showing a conventional example of a mold for manufacturing the seat pad with the reinforcing material. 10 and 11 have substantially the same contents as FIGS. 1 and 2 of Patent Document 1, respectively.
- the seat pad 120 in FIG. 10 is disposed along a seat pad body 121 made of a foamed synthetic resin such as polyurethane foam, and a surface opposite to the seating surface of the seat pad body 121 (hereinafter referred to as a back surface).
- a reinforcing material 122 integrated with the seat pad main body 121 is included.
- the reinforcing material 122 is made of a nonwoven fabric or the like.
- the mold 101 in FIG. 11 has an upper mold 102 and a lower mold 103.
- the upper mold 102 and the lower mold 103 are matched with each other at their peripheral portions.
- a symbol P in FIG. 11 indicates a parting line formed by joining the mating surfaces of the peripheral portions of the upper mold 102 and the lower mold 103.
- the seat pad 120 (the seat pad main body 121) is molded with the seat surface facing downward. That is, the back surface of the seat pad 120 is formed by the cavity inner surface of the upper mold 102, and the seating surface and the side peripheral surface of the seat pad 120 are molded by the cavity inner surface of the lower mold 103.
- the reinforcing material 122 is disposed along the inner surface of the cavity of the upper mold 102, and the reinforcing material 122 is fixed to the upper mold 102 by a fixing tool (not shown) such as a pin or a magnet.
- a foamed synthetic resin raw material is supplied into the lower mold 103 and the mold is clamped to foam the raw material.
- the seat pad main body 121 is molded, and the seat pad main body 121 and the reinforcing material 122 are integrated.
- the mold is opened and demolded to obtain a seat pad 120 in which a reinforcing material 122 is integrally provided on the back surface.
- the seat pad 120 is reinforced to evenly and sufficiently reinforce the seat pad 120 to the end side of the seat surface, and to prevent the outer edge portion of the reinforcing material 122 from being peeled off from the seat pad main body 121 due to bending of the seat pad 120 when seated. It is desirable that the material 122 is disposed up to the end on the outer peripheral side of the back surface of the seat pad main body 121.
- a parting line P exists at a position corresponding to the outer peripheral end of the back surface of the seat pad body 121 in the inner surface of the cavity 104 of the mold 101. Therefore, when the reinforcing material 122 is disposed up to the end on the outer peripheral side of the back surface of the seat pad main body 121, high mounting accuracy is required when the reinforcing material 122 is attached to the inner surface of the cavity of the upper mold 102.
- the manufacturing work is complicated. That is, in this case, when attaching the reinforcing material 122 to the inner surface of the cavity of the upper mold 102, it is necessary to align the outer peripheral edge of the reinforcing material 122 with the parting line P.
- the reinforcing material 122 may be sandwiched between the mating surfaces of the upper mold 102 and the lower mold 103 during mold clamping. In this case, the seal becomes insufficient in the parting line P after the mold clamping, there is a fear that defective molding occurs.
- the reinforcing material 122 is designed to be slightly smaller than the back surface of the seat pad body 121, and when the reinforcing material 122 is attached to the inner surface of the cavity of the upper mold 102, the reinforcing material 122 is used.
- the reinforcing material 122 is arranged so that the outer peripheral edge of the part is slightly separated from the parting line P toward the center of the inner surface of the cavity.
- molding defects caused by the sandwiching of the reinforcing material 122 into the parting line P are disposed so that the reinforcing material 122 straddles the position corresponding to the parting line P on the outer surface of the molded body 121. May also occur.
- the present invention can produce a foamed molded product in which a reinforcing material is disposed up to a position corresponding to a parting line on the inner surface of a cavity of a mold, on the outer surface of a molded product body, and to the parting line. and to provide a mold capable of preventing molding defects caused by entrapment of the reinforcement.
- this invention aims at providing the manufacturing method of the foaming molding using this metal mold
- a mold according to a first aspect is a foam molding having a molded body made of a synthetic foam resin, and a reinforcing material disposed along at least a part of the outer surface of the molded body and integrated with the molded body.
- a mold for manufacturing a body wherein the mold includes at least two molds, and the molds are clamped to form a cavity surrounded by the molds.
- a parting line is formed on the inner surface of the cavity by joining the mating surfaces of the molding dies. At the time of manufacturing the foamed molded body, at least one part is required before clamping.
- the reinforcing material is disposed along the inner surface of the cavity of the mold, wherein the reinforcing material is disposed adjacent to at least a part of the parting line in the cavity, and then clamped
- the cavity In the mold in which the foamed synthetic resin raw material is foamed, at least a part of the parting line where the reinforcing material is adjacently disposed, the concave stepped part facing the inside of the cavity on the mating surface of at least one of the molds
- the concave step portion is configured such that the reinforcing material can be retracted into the concave step portion when the reinforcing material enters between the mating surfaces of the parting line during mold clamping. It is characterized by being.
- the mold according to the second aspect is characterized in that, in the first aspect, the width of the concave step portion in the extending direction of the mating surface and the direction of entering and exiting from the cavity is 1 to 10 mm.
- the mold according to a third aspect is the mold according to the first or second aspect, wherein the reinforcing material is made of a nonwoven fabric having a basis weight of 0.05 to 0.2 kg / m 2 and the depth of the concave step portion from the mating surface. Is 0.2 to 3 mm.
- a seal member for sealing between the mating surfaces is provided on the opposite side of the cavity from the concave stepped portion. It is characterized by being.
- a method for producing a foamed molded body comprising: a molded body main body made of a foamed synthetic resin; and a reinforcing material disposed along at least a part of the outer surface of the molded body main body and integrated with the molded body main body.
- the outer peripheral edge of the reinforcing material is in contact with the parting line, or the outer peripheral edge of the reinforcing material and the party member.
- spacing between the Ngurain is characterized in placing the stiffener so that 5mm or less.
- the foamed molded body of the seventh aspect has a molded body main body made of foamed synthetic resin, and a reinforcing material that is disposed along at least a part of the outer surface of the molded body main body and integrated with the molded body main body.
- a foamed molded product which is produced by the method for producing a foamed molded product of the fifth or sixth aspect.
- Foamed molded article of the eighth aspect, in the seventh aspect, is characterized in that the foam moldings are seat pad.
- the reinforcing material is disposed along the inner surface of the cavity of at least one molding die before clamping, and at this time, this reinforcing material is used as the cavity. It arrange
- a concave step portion facing the inside of the cavity is provided on the mating surface of at least one of the molds.
- a molded foam body in which a reinforcing material is disposed up to a position corresponding to the parting line on the inner surface of the mold cavity is formed on the outer surface of the molded body body without causing molding defects in the molded body body.
- an allowable range of a mounting error of the reinforcing material is about 0 to 5 mm.
- the width of the concave step portion in the extending direction of the mating surface of the mold and in the direction of entering and exiting from the cavity is 1 to 10 mm.
- the depth of the concave step from the mating surface of the mold is appropriately set according to the thickness of the reinforcing material used for the foamed molded product.
- a cloth material such as a nonwoven fabric
- the depth of the stepped portion is set.
- the depth of the concave step portion is set to 0.2. It is preferably set to 3 mm.
- a reinforcing member is provided between the mating surfaces of the parting line by providing a seal member for sealing between the mating surfaces of the mold on the opposite side of the cavity from the concave stepped portion. It is possible to further improve the sealing performance of the parting line when it enters between the gaps.
- the manufacturing method of the foaming molding of the 5th mode manufactures a foaming molding with a reinforcing material using the metallic mold of the present invention. Therefore, according to the method for producing a foamed molded article of the present invention, as described above, the parting line on the inner surface of the cavity of the mold out of the outer surface of the molded body without causing molding defects in the molded body. It is possible to manufacture a foamed molded body in which a reinforcing material is disposed up to a corresponding position.
- the reinforcing material in the method for producing a foamed molded article of the present invention, it is preferable to dispose the reinforcing material so that the distance between the outer peripheral edge of the reinforcing material and the parting line is 5 mm or less as in the sixth aspect.
- the reinforcing material By arranging the reinforcing material in this way, it is possible to more surely correspond to the parting line on the inner surface of the cavity of the mold out of the outer surface of the molded body without causing molding defects in the molded body. It is possible to manufacture a foamed molded body in which the reinforcing material is disposed up to the position where the reinforcing material is placed.
- the foamed molded product of the seventh aspect manufactured by the method for manufacturing a foamed molded product of the present invention it is possible to prevent a molding defect from occurring due to the reinforcing material sandwiched in the parting line in the molded product main body, and In the outer surface of the molded body, the reinforcing material is disposed up to a position corresponding to the parting line on the cavity inner surface of the mold.
- the present invention is suitable for application to a seat pad.
- FIG. 4a and 4b are a rear view and a cross-sectional view of a seat pad as a foam molded body manufactured using the mold of FIG. 5a and 5b are enlarged sectional views of the same part as in FIG. 2 when a reinforcing material enters the parting line of the mold of FIG. 6a and 6b are a rear view of a seat pad and a plan view of a lower mold showing a second embodiment.
- Figure 7a, 7b is an enlarged sectional view of FIG.
- the following embodiment shows an application example of the present invention to a mold for manufacturing a seat pad and a method of manufacturing a seat pad using the mold.
- the present invention can also be applied to a mold for producing a foam molded body other than the pad and a method for producing a foam molded body using this mold.
- FIG. 1 is a sectional view of a mold according to the first embodiment.
- FIG. 2 is an enlarged cross-sectional view of a portion II in FIG.
- FIG. 3 is a plan view of the lower mold of this mold.
- FIG. 4a is a back view of a seat pad as a foam molded body manufactured using this mold
- FIG. 4b is a cross-sectional view taken along line IVB-IVB in FIG. 4a.
- FIGS. 5a and 5b are enlarged sectional views of the same part as in FIG. 2 when a reinforcing material enters the parting line of this mold
- FIG. 5a shows a state before mold clamping
- FIG. 5b Indicates the state after clamping.
- the mold 1 is for manufacturing the seat pad 20 constituting the vehicle seat.
- the seat pad 20 is a cushion pad that constitutes a seat portion of a vehicle seat, but the present invention can also be applied to a back pad that constitutes a backrest portion of a vehicle seat.
- FIG. 1 shows a vertical cross section along the left-right direction when the seat pad (cushion pad) 20 is used.
- the seat pad 20 includes a seat pad main body 21 as a molded body made of a foamed synthetic resin such as polyurethane foam, and a back surface of the seat pad main body 21 (in this embodiment, since the seat pad 20 is a cushion pad, the seat pad main body And a reinforcing member 22 integrated with the seat pad main body 21.
- a seat pad main body 21 as a molded body made of a foamed synthetic resin such as polyurethane foam
- a back surface of the seat pad main body 21 in this embodiment, since the seat pad 20 is a cushion pad, the seat pad main body And a reinforcing member 22 integrated with the seat pad main body 21.
- the reinforcing material 22 is disposed substantially to the end on the outer peripheral side of the back surface of the seat pad main body 21.
- the reinforcing member 22 has a shape that covers substantially the entire back surface of the seat pad body 21, and the outer peripheral edge of the back surface of the seat pad body 21 extends over the entire circumference. It arrange
- a parting line P is present at a position corresponding to the outer peripheral end of the back surface of the seat pad body 21 in the inner surface of the cavity 4 of the mold 1 described later.
- the reinforcing member 22 is made of a breathable material. As this air-permeable material, a nonwoven fabric or the like is suitable.
- the shape and arrangement of the reinforcing material 22 and the constituent materials are not limited to this.
- the reinforcing member 22 has a shape that covers a part of the back surface of the seat pad main body 21, and is arranged so that a part of the outer peripheral edge thereof is aligned with a part of the end on the outer peripheral side of the back surface of the seat pad main body 21. May be.
- Reinforcement 22, of the outer surface of the seat pad main body 21 may be disposed in a region other than the back surface of the seat pad main body 21.
- the reinforcing material 22 may be disposed across two or more of the back surface, the side peripheral surface, and the seat surface of the seat pad main body 21.
- the reinforcing material 22 may be made of a material other than the nonwoven fabric.
- a breathable member may be disposed in a region of the reinforcing member 22 that overlaps an exhaust hole 5 of the mold 1 described later.
- ⁇ Disposed to the corresponding position) '' means that the outer peripheral edge of the reinforcing member 22 is closer to the rear surface than the outer peripheral end of the rear surface of the seat pad main body 21 within a preset allowable range of attachment error. It shows that it may be located on the center side or may protrude from the outer peripheral end of the back surface to the side of the seat pad main body 21.
- the mold 1 has an upper mold 2 and a lower mold 3, and gas in a cavity 4 surrounded by the upper mold 2 and the lower mold 3 is placed outside the cavity 4.
- An exhaust hole 5 for discharging is provided.
- the mold 1 may further have a core mold (not shown).
- the upper mold 2 and the lower mold 3 correspond to the mold of the first mode.
- the upper mold 2 and the lower mold 3 are matched with each other at their peripheral portions.
- Reference symbol P denotes a parting line formed by joining the mating surfaces 2a and 3a (see FIGS. 2, 3, 5a, and 5b) at the peripheral portions of the upper die 2 and the lower die 3. During foam molding, the gas in the cavity 4 is also discharged from the parting line P.
- the exhaust hole 5 is provided on the center side of the cavity inner surface 2b of the upper mold 2 with respect to the parting line P.
- the exhaust hole 5 has, for example, a portion located higher than the parting line P in the cavity inner surface 2b of the upper mold 2 or a portion lower than the parting line P between the parting line P and the exhaust hole 5. such portions exist, only from the parting line P during foam molding is disposed in the escape difficult part gas.
- FIG. 1 two exhaust holes 5 arranged at intervals in the left-right direction of the seat pad are shown, but the number and arrangement of the exhaust holes 5 are not limited to this.
- the exhaust hole 5 may be provided also in the lower mold
- the seat pad 20 (the seat pad main body 21) is molded by a seat surface down. That is, the seat surface and the side peripheral surface of the seat pad 20 are formed by the cavity inner surface 3 b of the lower mold 3, and the back surface of the seat pad 20 is formed by the cavity inner surface 2 b of the upper mold 2.
- the parting line P is located at the boundary between the back surface and the side peripheral surface of the seat pad 20, that is, at the end on the outer peripheral side of the back surface of the seat pad 20.
- positioning of the parting line P is not limited to this, You may arrange
- the reinforcing material 22 Prior to the foam molding process of the seat pad 20, the reinforcing material 22 is disposed along the cavity inner surface 2 b of the upper mold 2, and the reinforcing material 22 is fixed to the upper mold 2 by a fixing tool (not shown) such as a pin or a magnet. . At that time, the reinforcing member 22 is arranged so that the outer peripheral edge thereof is substantially aligned with the parting line P over the entire circumference.
- the reinforcing material 22 is arranged so that its outer peripheral edge is substantially aligned with the parting line P over the entire circumference” means that the reinforcing material 22 is attached to the cavity inner surface 2 b of the upper mold 2.
- the center side of the cavity inner surface 2b of the boundary portion Bd 1 between the mating surfaces 2a and the cavity inner surface 2b of the upper mold 2 Or may protrude from the boundary Bd 1 to the mating surface 2a side (or in the state where the mold 1 is clamped, the peripheral edge of the reinforcing member 22 exceeds the parting line P). It may overlap the cavity inner surface 3b of the lower mold 3).
- a concave step portion 6 facing the inside of the cavity 4 is provided on the mating surface 3 a of the lower mold 3.
- the concave step portion 6 is configured such that the reinforcing member 22 can be retracted into the concave step portion 6 when the reinforcing member 22 enters the parting line P (between the mating surfaces 2a and 3a). Yes.
- the concave step 6 is also aligned as shown in FIG. It is formed over the entire circumference of the surface 3a.
- the boundary portion Bd 2 between the bottom surface of the recessed step portion 6 and the cavity inner surface 3b of the lower die 3 in the extending direction of the mating surfaces 2a and 3a is as described above. It overlaps with the boundary portion Bd 1 between the mating surface 2a of the upper mold 2 and the cavity inner surface 2b.
- the boundary portion Bd 1, Bd 2 each other, the mating surfaces 2a may be shifted in the extending direction of 3a.
- the width W 1 of the concave step portion 6 from the boundary portion Bd 2 in the extending direction of the mating surfaces 2 a and 3 a and the direction of entering and exiting from the cavity 4 (FIG. 2; hereinafter simply referred to as the width W 1 ) is this gold. It is set as appropriate according to the allowable range of the mounting error of the reinforcing member 22 set in advance for the seat pad 20 manufactured using the mold 1. For example, when the seat pad 20 is for constituting a very general vehicle seat, the allowable range of the mounting error of the reinforcing member 22 is about 0 to 5 mm. In this case, the width W 1 of the recessed step portion 6 is preferably 1 to 10 mm, particularly 5 to 10 mm.
- the depth D from the mating surface 3a to the bottom surface of the recessed step portion 6 (FIG. 2; hereinafter simply referred to as depth D) is appropriately set according to the thickness of the reinforcing material 22 used for the seat pad 20. .
- the depth D is set to 0.2 to 0.5 mm, particularly 0. .3 to 0.4 mm is preferable, and when the basis weight of this nonwoven fabric is 0.1 to 0.2 kg / m 2 , the depth D is set to 0.3 to 3 mm, particularly 0.4 to 0.5 mm. It is preferable.
- the recessed step portion 6 is provided on the mating surface 3a of the lower mold 3, but may be provided on the mating surface 2a of the upper mold 2, and the upper mold 2 and the lower mold 3 may be provided. It may be provided on both the mating surfaces 2a and 3a.
- the reinforcing material 22 is disposed along the cavity inner surface 2b of the upper mold 2, and the reinforcing material 22 is fixed to the upper mold 2 by the fixing tool (reinforcement). Material placement process).
- the reinforcing material 22 is disposed so as to cover the entire cavity inner surface 2b of the upper mold 2, and the outer peripheral edge of the reinforcing material 22 is arranged around the entire parting line P (the cavity inner surface 2b of the upper mold 2). And the boundary portion Bd 1 ) with the mating surface 2a.
- a foamed synthetic resin raw material is injected into the lower mold 3, and the lower mold 3 and the upper mold 2 are clamped to foam the raw material (foam molding process).
- the foamed synthetic resin formed by foaming this raw material fills the cavity 4.
- the gas in the cavity 4 passes through the reinforcing material 22 made of a gas permeable material and is discharged out of the cavity 4 from the exhaust hole 5.
- the seat pad main body 21 is molded and the seat pad main body 21 and the reinforcing material 22 are integrated.
- the mold is opened and demolded. Then, the seat pad 20 is completed by performing the finishing process of the surface of the seat pad 20 as needed.
- the mold 1 at least the mating surface 3 a of the lower mold 3 among the mating surfaces 2 a and 3 a of the upper mold 2 and the lower mold 3 that are joined to each other in the parting line P in which the reinforcing material 22 is disposed adjacently.
- a concave step 6 facing the cavity 4 is provided, and if the reinforcing material 22 enters between the mating surfaces 2a and 3a at the time of clamping, the reinforcing material 22 becomes the concave step 6. It can be evacuated inside. Thereby, it is possible to more reliably prevent the molding defect of the seat pad main body 21 due to the reinforcement member 22 being caught in the parting line P.
- the reinforcing material 22 is disposed up to a position corresponding to the parting line P on the inner surface of the cavity 4 of the mold 1 in the outer surface of the seat pad main body 21 without causing molding defects in the seat pad main body 21.
- the manufactured seat pad 20 can be manufactured.
- the allowable range of the mounting error of the reinforcing member 22 is about 0 to 5 mm. Therefore, as in this embodiment, the mating surfaces 2a and 3a By setting the width of the recessed step portion 6 in the extending direction of the cavity 4 and in the direction of entering and exiting from the cavity 4 to 1 to 10 mm, preferably 5 to 10 mm, even if an attachment error occurs in the reinforcing member 22 within the above allowable range, It is possible to prevent molding defects of the seat pad main body 21 due to the reinforcement member 22 being caught in the parting line P more reliably.
- the reinforcing material 22 is made of a nonwoven fabric, and the depth D of the recessed step portion 6 is appropriately set according to the basis weight of the nonwoven fabric. That is, when the basis weight of this nonwoven fabric is 0.05 to 0.1 kg / m 2 , the depth D is preferably 0.2 to 0.5 mm, and the basis weight of this nonwoven fabric is 0.1 to 0.2 kg / m 2. When m 2 , the depth D is preferably 0.3 to 3 mm. With this configuration, even when the reinforcing material 22 enters between the mating surfaces 2 a and 3 a, the reinforcing material 22 can be sufficiently accommodated in the recessed step portion 6.
- FIG. 6a is a back view of the seat pad manufactured by the mold according to the second embodiment
- FIG. 6b is a plan view of the lower mold of the mold.
- the reinforcing material 22 has a shape covering substantially the entire back surface of the seat pad main body 21, and the reinforcing material 22 is formed on the inner surface of the cavity of the upper mold 2.
- the outer peripheral edge of the reinforcing member 22 is adjacent to the parting line P over the entire circumference of the parting line P of the mold 1. Therefore, in the first embodiment, the recessed step 6 for retracting the reinforcing material is formed over the entire circumference of the parting line P.
- the reinforcing material 22 is the back surface of the seat pad main body 21. In that case, the recessed step 6 for retracting the reinforcing material is provided only in the part of the parting line P where the outer peripheral edge of the reinforcing material 22 is adjacent. Also good.
- the reinforcing member 22 is the rear half in the front-rear direction when the seat pad 20A is used, on the back surface of the seat pad body 21, as shown in FIG. 6a.
- the reinforcing material 22 is disposed up to the outer peripheral end on the rear half side of the back surface of the seat pad main body 21. Therefore, when the reinforcing member 22 is arranged along the cavity inner surface 2a of the upper mold 2 (not shown in FIG. 6b), it corresponds to the outer peripheral end of the rear half side of the back surface of the seat pad body 21 in the parting line P.
- the outer peripheral edge of the reinforcing member 22 is adjacent only to approximately half the circumference. Therefore, in this embodiment, as shown in FIG. 6b, it is only necessary to provide the recessed step portion 6 only in the substantially half circumference of the rear half side where the outer peripheral edge of the reinforcing member 22 is adjacent to the parting line P.
- the outer peripheral edge of the reinforcing member 22 is not adjacent to the rest of the parting line P, it is preferable not to provide a recessed step portion 6. By doing in this way, it is prevented that an extra burr
- the recessed step portion 6 is provided on the mating surface 3a of the lower mold 3, but may be provided on the mating surface 2a of the upper mold 2 and the upper mold. 2 and the lower mold 3 may be provided on both mating surfaces 2a and 3a.
- FIGS. 7a and 7b are enlarged sectional views in the vicinity of the parting line of the mold according to the third embodiment (the same part as FIG. 2).
- FIG. 7a shows a state before mold clamping.
- FIG. 7b shows the state after mold clamping.
- FIGS. 7a and 7b show a case where a reinforcing material enters the parting line of the mold.
- FIG. 8 is a plan view of the lower mold in this mold.
- a sealing member 7 for sealing between the mating surfaces 2a, 3a of the upper mold 2 and the lower mold 3 on the opposite side of the cavity 4 from the concave step portion 6.
- the seal member 7 is made of an elastic material such as rubber.
- the sealing member 7, for example, silicon rubber, fluorine rubber, although nitrile rubbers and the like are suitable, but is not limited thereto.
- a sealing member mounting groove 2c is provided on the mating surface 2a of the upper mold 2, and the sealing member 7 has a base end side (the upper end side in FIGS. 7a and 7b) on the sealing member mounting groove 2c. It is being fixed to the upper mold
- the seal member 7 is provided over the entire circumference of the mating surface 2 a of the upper mold 2. As shown in FIG. 7a, when the upper mold 2 and the lower mold 3 are opened, the tip side of the sealing member 7 from the mating surface 2a of the upper mold 2 (the lower end side in FIGS. 7a and 7b) is the lower mold 3. It will be overhanging to the side.
- the front end side of the seal member 7 is pressed against the mating surface 3a of the lower mold 3, and the seal member 7 is elastically moved between the mating surface 2a of the upper mold 2 (the inner surface of the seal member mounting groove 2c) and the lower mold 3. By being in close contact with the mating surface 3a, the space between them is sealed.
- the seal member 7 is inserted into the parting line P when the mold is clamped, and further, the reinforcement material 22 extends further to the outside of the cavity 4 than the recessed step portion 6 (however, the seal member). 7 to the cavity 4 side), even when sandwiched between the mating surfaces 2a and 3a, the mating surfaces 2a and 3a can be sufficiently sealed. That is, in this embodiment, the region from the inner surface of the cavity 4 to the seal member 7 between the mating surfaces 2a and 3a is the reinforcing material 22 between the mating surfaces 2a and 3a during mold clamping. Thus, even when the reinforcing material 22 is inserted, the reinforcing material is allowed to be sandwiched between the mating surfaces 2a and 3a.
- the distance from the boundary Bd 1 between the mating surface 2a of the upper mold 2 and the cavity inner surface 2a to the seal member 7 in the extending direction of the mating surface 2a and in the direction of entering and exiting from the cavity 4 (that is, the reinforcing material sandwiching allowable region) Width) W 2 (FIG. 7a) is also similar to the width W 1 of the recessed step portion 6 in the mounting error of the reinforcing member 22 set in advance with respect to the seat pad 20 manufactured using the mold 1A. It is set as appropriate according to the allowable range. For example, when the seat pad 20 is for constituting a very general vehicle seat, the allowable range of the mounting error of the reinforcing member 22 is about 0 to 5 mm. In this case, the distance W 2 from the boundary portion Bd 1 to the seal member 7 is preferably 1 to 10 mm, particularly 5 to 10 mm.
- seal member 7 may be disposed away from the concave step portion 6 to the outside of the cavity 4, or may be disposed adjacent to the concave step portion 6.
- the distance between the seal member 7 and the recessed step portion 6 is preferably 0 to 10 mm, particularly 3 to 5 mm.
- the protruding height T (FIG. 7a) of the seal member 7 from the mating surface 2a in the mold open state is also set as appropriate according to the thickness of the reinforcing member 22 as with the depth D of the recessed step portion 6.
- a cloth material such as a nonwoven fabric
- the overhang height T is set to 0.2 to 1.5 mm, in particular. It is preferably 0.5 to 0.8 mm, and when the basis weight of this nonwoven fabric is 0.1 to 0.2 kg / m 2 , the overhang height T is 0.5 to 1.5 mm, particularly 0.8 to 1. .2 mm is preferable.
- FIGS. 7a, 7b and 8 are the same as those of the mold 1 in the first embodiment, and the same reference numerals in FIGS. 7a, 7b and 8 as those in FIGS. 1 to 5b denote the same parts.
- the method of manufacturing the seat pad 20 using this mold 1A is the same as that using the mold 1.
- a seal member 7 for sealing between the mating surfaces 2a and 3a of the upper mold 2 and the lower mold 3 is provided on the opposite side of the cavity 4 from the concave step portion 6. Therefore, the sealing performance of the parting line P when the reinforcing material 22 enters between the mating surfaces of the parting line P during mold clamping can be further improved.
- the seal member 7 is such that the reinforcing material 22 that has entered the parting line P further protrudes outward of the cavity 4 from the recessed step portion 6 (but to the cavity 4 side of the seal member 7). Even when sandwiched between the mating surfaces 2a and 3a, the mating surfaces 2a and 3a can be sufficiently sealed. Therefore, even when the attachment error of the reinforcing material 22 is somewhat increased, it is possible to sufficiently prevent the molding failure of the seat pad main body 21 due to the reinforcement material 22 being caught in the parting line P.
- FIG. 9 is a plan view of the lower mold in the mold according to the fourth embodiment.
- the reinforcing material 22 is adjacent to only a part of the parting line P, and the concave step portion 6 is provided only in the part of the parting line P where the reinforcing material 22 is adjacent.
- the seal member 7 may be provided on the side opposite to the cavity 4 from the concave step portion 6.
- the seal member 7 is preferably provided over the entire circumference of the parting line P.
- the seal member 7 is preferably provided over the entire circumference of the parting line P.
- the width W 2 of the sandwiching reinforcement allowable region are arranged such that the preferred range described above, other portions That is, the portion where the recessed step portion 6 does not exist between the inner surface of the cavity 4 is arranged at a position as close as possible to the inner peripheral side (cavity 4 side) edge of the mating surfaces 2a and / or 3a. It is preferable. As a result, in the portion where the recessed step portion 6 is not provided, it is possible to prevent the foamed synthetic resin from entering the parting line P as much as possible, and to prevent extra burrs and the like from occurring in the seat pad body 21. can do.
- each of the above embodiments shows an application example of the present invention to a seat pad, but the present invention can also be applied to a foam molded body other than the seat pad.
- the present invention can be applied not only to the mating surface of the upper mold and the lower mold, but also to all the mating positions of the molds such as the upper mold and the core mold, and the lower mold and the core mold.
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Abstract
Description
第1図は、第1の実施の形態に係る金型の断面図である。第2図は、第1図のII部分の拡大断面図である。第3図は、この金型の下型の平面図である。第4a図は、この金型を用いて製造された発泡成形体としてのシートパッドの裏面図であり、第4b図は、第4a図のIVB-IVB線に沿う断面図である。第5a,5b図は、この金型のパーティングラインに補強材が入り込んだ場合における第2図と同様部分の拡大断面図であり、第5a図は型締め前の状態を示し、第5b図は型締め後の状態を示している。
第6a図は、第2の実施の形態に係る金型により製造されたシートパッドの裏面図であり、第6b図は、この金型の下型の平面図である。
第7a,7b図は、第3の実施の形態に係る金型のパーティングライン付近(第2図と同様部分)の拡大断面図であり、第7a図は型締め前の状態を示し、第7b図は型締め後の状態を示している。なお、第7a,7b図は、この金型のパーティングラインに補強材が入り込んだ場合を示している。第8図は、この金型における下型の平面図である。
第9図は、第4の実施の形態に係る金型における下型の平面図である。
なお、本出願は、2012年2月13日付で出願された日本特許出願(特願2012-028460)に基づいており、その全体が引用により援用される。
Claims (8)
- 発泡合成樹脂よりなる成形体本体と、該成形体本体の外面の少なくとも一部に沿って配置され、該成形体本体と一体化された補強材とを有する発泡成形体を製造するための金型であって、
該金型は、少なくとも2個の成形型を備えており、該成形型同士が型締めされることにより、該成形型同士によって囲まれたキャビティが形成され、該キャビティの内面に、各成形型の合わせ面同士が接合されてなるパーティングラインが形成されるものであり、
該発泡成形体を製造するに当り、型締め前に、少なくとも1個の該成形型の該キャビティ内面に沿って該補強材が配置され、その際、該補強材は、該キャビティ内の該パーティングラインの少なくとも一部に隣接するように配置され、その後、型締めされ、該キャビティ内で発泡合成樹脂原料が発泡される金型において、
該パーティングラインのうち少なくとも該補強材が隣接配置される部分において、少なくとも一方の該成形型の合わせ面に、該キャビティ内に臨む凹段部が設けられており、
該凹段部は、型締め時に該補強材が該パーティングラインの合わせ面同士の間に入り込んだ場合に、該補強材が該凹段部内に退避しうるように構成されていることを特徴とする金型。 - 請求項1において、前記合わせ面の延在方向且つ前記キャビティからの出入り方向における前記凹段部の幅は1~10mmであることを特徴とする金型。
- 請求項1又は2において、前記補強材は、目付が0.05~0.2kg/m2の不織布よりなり、
前記合わせ面からの前記凹段部の深さは0.2~3mmであることを特徴とする金型。 - 請求項1ないし3のいずれか1項において、前記凹段部よりも前記キャビティと反対側に、前記合わせ面同士の間をシールするためのシール部材が設けられていることを特徴とする金型。
- 発泡合成樹脂よりなる成形体本体と、該成形体本体の外面の少なくとも一部に沿って配置され、該成形体本体と一体化された補強材とを有する発泡成形体を、請求項1ないし4のいずれか1項に記載の金型を用いて製造する発泡成形体の製造方法であって、
該金型の型締め前に、少なくとも1個の前記成形型の前記キャビティ内面に沿って該補強材を配置し、その際、該補強材を前記キャビティ内の前記パーティングラインの少なくとも一部に隣接するように配置する補強材配置工程と、
該補強材配置工程の後、該金型を型締めし、該キャビティ内で発泡合成樹脂原料を発泡させる発泡成形工程と
を行うことを特徴とする発泡成形体の製造方法。 - 請求項5において、
前記補強材配置工程において、前記補強材の外周縁が前記パーティングラインに接するか、又は、該補強材の外周縁と該パーティングラインとの間の間隔が5mm以下となるように該補強材を配置することを特徴とする発泡成形体の製造方法。 - 発泡合成樹脂よりなる成形体本体と、該成形体本体の外面の少なくとも一部に沿って配置され、該成形体本体と一体化された補強材とを有した発泡成形体であって、
請求項5又は6に記載の発泡成形体の製造方法により製造された発泡成形体。 - 請求項7において、該発泡成形体はシートパッドであることを特徴とする発泡成形体。
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US14/378,046 US10099409B2 (en) | 2012-02-13 | 2013-02-06 | Mold, method for manufacturing molded foam body, and molded foam body |
CN201380008819.6A CN104114344B (zh) | 2012-02-13 | 2013-02-06 | 模具、发泡成型体的制造方法以及发泡成型体 |
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JP2006198818A (ja) * | 2005-01-19 | 2006-08-03 | Toyo Tire & Rubber Co Ltd | シート用パッド成形用金型及びシート用パッドの製造方法 |
WO2009145102A1 (ja) * | 2008-05-28 | 2009-12-03 | 株式会社ブリヂストン | 発泡成形用の金型及び発泡成形方法 |
JP2010017962A (ja) * | 2008-07-11 | 2010-01-28 | Bridgestone Corp | 発泡成形品及びその製造方法 |
JP2011110798A (ja) * | 2009-11-26 | 2011-06-09 | Bridgestone Corp | サポート材、発泡成形部材及び発泡成形方法 |
JP2011218573A (ja) * | 2010-04-05 | 2011-11-04 | Bridgestone Corp | 成形用金型及び該成形用金型を用いた発泡成形体の製造方法 |
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CN104114344B (zh) | 2016-10-19 |
MX2014009672A (es) | 2015-03-03 |
US10099409B2 (en) | 2018-10-16 |
JP2013163346A (ja) | 2013-08-22 |
US20150001754A1 (en) | 2015-01-01 |
JP5905288B2 (ja) | 2016-04-20 |
CN104114344A (zh) | 2014-10-22 |
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