WO2018061250A1 - フィルム材のインサート成形方法及びその装置 - Google Patents
フィルム材のインサート成形方法及びその装置 Download PDFInfo
- Publication number
- WO2018061250A1 WO2018061250A1 PCT/JP2017/010504 JP2017010504W WO2018061250A1 WO 2018061250 A1 WO2018061250 A1 WO 2018061250A1 JP 2017010504 W JP2017010504 W JP 2017010504W WO 2018061250 A1 WO2018061250 A1 WO 2018061250A1
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- WO
- WIPO (PCT)
- Prior art keywords
- resin layer
- film material
- transparent resin
- intermediate body
- edge
- Prior art date
Links
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Images
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Definitions
- the present invention relates to a film material insert molding method and apparatus for forming a transparent resin layer on the surface of a film material having a design portion and forming a base resin layer on the back surface.
- a film material provided with a design portion is pasted and integrated with a transparent resin layer or a base resin layer by an insert molding method. Things are in practical use.
- the base resin layer As a method of affixing the film material to the base resin layer, etc., after placing the film material in which the design part is decorated (preliminarily molded) with a pattern or an uneven shape in the cavity of the injection mold, the base resin layer A method of joining a film material and a base resin layer by thermal welding by injecting a molten resin material, such as a material, into the cavity is employed.
- a radio wave radar device for example, a millimeter wave radar device
- a radio wave radar device is disposed behind the front grill for the purpose of driving support such as measuring the distance between vehicles and the distance from obstacles.
- the emblem which is an exterior product having a design portion, is fixed to the center portion of the front grill at the front end of the vehicle body, it occupies a position overlapping with the traveling path of the radar wave emitted from the radio wave radar device. Accordingly, a method of manufacturing an emblem (vehicle radio wave transmission cover) having a characteristic capable of transmitting radar waves has been proposed.
- the method for manufacturing a radio wave transmission cover for a vehicle disclosed in Patent Document 1 includes a shaping process for forming a rugged design portion and shaping a film material on which a metal film is deposited, and forming the film material into a final outer shape.
- a decorative body forming process for forming a decorative body, a decorative body forming process for forming a decorative body, a transparent resin layer forming process for forming a transparent resin layer on the surface of the decorative body by an injection process, and a decorative body A base resin layer forming step for forming a base resin layer on the back surface of the base material by an injection step.
- an emblem having a three-layer structure of a film material, a transparent resin layer, and a base resin layer is manufactured.
- a transparent resin layer and a base resin layer are sequentially injection-molded on both front and back surfaces of a film material, and then the whole is molded (cut) to obtain the outer shape of the final product. Since the trimming manufacturing process is unnecessary, the manufacturing process is simplified.
- Patent Document 1 does not require trimming of the outer shape after the base resin layer forming process, which is the final process, and has the advantage that the manufacturing process can be simplified. There is a possibility that the appearance of the final product (insert molded product) after the layer forming step cannot be sufficiently improved.
- the gate After completing the transparent resin layer formation process, the gate is placed at the side of the cavity that avoids the design surface, taking into account the removal traces due to the removal of the solid resin of the gate resin formed by solidification of the molten resin remaining in the gate Then, there is a tendency to adopt a side gate type mold in which a molten resin material is injected into the cavity from the side of the cavity.
- the shearing force acts on the film material arranged in the mold by the flow pressure of the molten transparent resin material that flows in the direction parallel to the surface of the film material in the side gate, and the film material is in the specified position. It has become a factor to move from.
- the end of the film material may be exposed on the outer peripheral side surface of the final product.
- the transparent resin layer and the base resin layer are formed on both the front and back surfaces of the film material by injection molding in a state of being interposed between the film materials.
- An object of the present invention is to provide a film material insert molding method and apparatus, etc., capable of improving the appearance of the final product while simplifying the production process.
- the invention of claim 1 is a film material insert molding method in which a transparent resin layer is formed on the surface of a film material provided with a design portion and a base resin layer is formed on the back surface.
- a base resin layer forming step comprising:
- the intermediate body formation process which forms the 1st intermediate body provided with the edge part extended radially outward in the outer peripheral end vicinity part of the final shape of a film material, and the 1st intermediate body to which the edge part was fixed
- one or a plurality of concave portions recessed inward in the radial direction is formed in the edge portion, and in the transparent resin layer forming step, the The first intermediate body is positioned by one or a plurality of recesses.
- the first intermediate in the transparent resin layer forming step, is positioned with a locating pin and radially inward at a position corresponding to the locating pin of the transparent resin layer.
- a recessed receiving surface portion is formed, and in the base resin layer forming step, the base resin layer is formed so as to cover the receiving surface portion.
- the invention of claim 4 is characterized in that, in the invention of any one of claims 1 to 3, a plurality of cuts extending in a radial direction are formed in the edge portion in the intermediate forming step.
- the invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein in the intermediate body forming step, an uneven shape is formed in the design portion, and in the base resin layer forming step, the insert molding is performed.
- the base resin layer is formed so that the thickness of the product is uniform.
- radio wave transmission can be ensured while providing a sense of depth.
- the invention of claim 6 is an insert molding apparatus for a film material that forms a transparent resin layer on the surface of a film material having a design portion and forms a base resin layer on the back surface. Formation of a transparent resin layer having a peripheral portion formed in the vicinity and extending outward in the radial direction, and forming a second intermediate body having a transparent resin layer by injection molding on the surface of the first intermediate body to which the edge portion is fixed And a base resin layer forming means for forming an insert-molded product having a base resin layer covering the radial outer end surface of the edge portion by injection molding on the back surface of the second intermediate body. It is characterized by that.
- the transparent resin layer is formed by injection molding on the surface of the first intermediate body that has the edge extending radially outwardly formed in the vicinity of the outer peripheral edge of the final shape of the film material and the edge is fixed. Since it has the transparent resin layer formation means which forms the 2nd intermediate body with which it was equipped, at the time of a transparent resin layer formation process, the edge part of a film material can be fixed, and, thereby, the molten transparent resin material which flows through the inside of a gate The movement of the film material due to the fluid pressure can be prevented, and the generation of wrinkles of the film material can be prevented.
- An insert that is a final product because it has a base resin layer forming means for forming an insert molded product having a base resin layer that covers the surface of the radially outer end of the edge by injection molding on the back surface of the second intermediate It can prevent that the edge part of a film material exposes from the outer peripheral side surface of a molded article, and can prevent the visual recognition of the film material edge part.
- a seventh aspect of the present invention provides the positioning mechanism according to the sixth aspect, wherein the transparent resin layer forming means positions the first intermediate body by one or a plurality of concave portions recessed radially inward of the edge portion. It is characterized by having prepared.
- the film material insert molding method and apparatus according to the present invention can improve the appearance of the final product while simplifying the manufacturing process.
- FIG. It is a partial longitudinal cross-sectional perspective view of the emblem of the vehicle manufactured by the insert molding method of the film material which concerns on Example 1.
- FIG. It is a principal part enlarged view of FIG. 1, Comprising: It is an enlarged view of area
- Embodiment 1 of the present invention will be described with reference to FIGS.
- This vehicle is equipped with a millimeter wave radar (not shown) at the position on the back side of the front grille.
- the millimeter wave radar uses a millimeter wave having a frequency of 30 GHz to 300 GHz and a wavelength of 1 to 10 mm, and a difference between a transmitted wave transmitted from the own vehicle and a received wave reflected from an object (for example, a preceding vehicle).
- the vehicle distance and relative speed between the object and the host vehicle can be measured based on this, and a driving support system such as an auto cruise system is executed using the detected value.
- the installation position of the millimeter wave radar is defined so that the emblem 1 having a uniform thickness is included in the traveling path of the radar.
- the emblem 1 includes a first intermediate body 2 on which a design portion is formed, a transparent resin layer 3 formed on the surface of the first intermediate body 2, and a back surface of the first intermediate body 2.
- the formed base resin layer 4 is provided.
- the thickness dimension of the emblem 1 is uniformly set to be an integral multiple of half the wavelength of the millimeter wave irradiated by the millimeter wave radar.
- the first intermediate 2 has a wavelength selectivity capable of controlling the transmission and reflection of light for each wavelength, has a radar light reflectance of 90% or more, and does not contain heavy metal (for example, PICASUS manufactured by Toray Industries, Inc.) (Registered trademark)).
- heavy metal for example, PICASUS manufactured by Toray Industries, Inc.
- the first intermediate body 2 includes a design portion 5 including a shape portion 5a and a background portion 5b formed around the shape portion 5a.
- a predetermined mark shape having a metallic luster (for example, silver color) and an elliptical shape surrounding the mark shape are formed so as to protrude from the background portion 5b toward the surface, and the background portion 5b has a shape portion 5a.
- the design is expressed in black in the area excluding.
- the surface of the first intermediate 2 is uniformly covered with a transparent transparent resin layer 3. Thereby, a feeling of depth is given to the design part 5, and the design property of the emblem 1 is improved.
- the transparent resin layer 3 is composed of a transparent resin material 12 (for example, polycarbonate (PC)) made of an amorphous synthetic resin. Since this transparent resin material 12 has molecular chains and cannot take a regular molecular arrangement in the process of cooling and solidifying from a molten state, it has a characteristic that the mechanical strength rapidly decreases when the glass transition temperature Tg is exceeded. is doing.
- a transparent resin material 12 for example, polycarbonate (PC)
- PC polycarbonate
- the transparent resin material 12 has a random arrangement even in the solidified state, the volume of the transparent resin material 12 is expanded or contracted by heating or cooling compared to a crystalline synthetic resin (for example, polyethylene (PE), polypropylene (PP), etc.). Has a gradual change trend.
- a crystalline synthetic resin for example, polyethylene (PE), polypropylene (PP), etc.
- the surface exposed to the outside of the transparent resin layer 3 is uniformly coated with a hard coat layer having an ultraviolet cut effect.
- the intermediate structure in which the transparent resin layer 3 is formed on the surface of the first intermediate 2 will be described as the second intermediate 6 for convenience of description.
- the back surface of the first intermediate body 2 (second intermediate body 6) and the outer peripheral portion of the radially outer end of the first intermediate body 2 are colored (for example, black).
- the base resin layer 4 is uniformly covered. Thus, the appearance of the emblem 1 is improved while ensuring the rigidity.
- the base resin layer 4 is made of a base resin material 13 made of an amorphous synthetic resin (for example, acrylonitrile butadiene styrene copolymer (ABS)).
- the base resin material 13 has a glass transition temperature lower than the glass transition temperature Tg (145 ° C.) of the transparent resin material 12.
- ABS polycarbonate ABS
- PC / ABS polycarbonate ABS
- PC / PBT polycarbonate PBT
- the insert molding processing procedure of the emblem 1 includes a first intermediate body 2 (see FIG. 7) provided with an edge 2 a extending radially outward in the vicinity of the outer peripheral end of the final shape of the film material 11.
- an emblem 1 as an insert-molded product provided with a base resin layer 4 covering the radial outer end of the edge 2a on the back surface of the second intermediate body 6 by injection molding.
- the intermediate forming step S ⁇ b> 1 includes a coloring step S ⁇ b> 11 for performing screen printing on the design portion 5 continuously on the front and back surfaces of the long belt-like film material 11, and the shape of each design portion 5.
- a film corresponding to the emblem 1 by performing a concavo-convex creating step S12 for forming a concavo-convex shape (concavo-convex design) on the part 5a, and trimming to remove an unnecessary portion from the long strip-shaped film material 11 so as to have a final outer shape.
- the trimming process S13 which forms the final shape (1st intermediate body 2) of the material 11 is comprised.
- the coloring device 21 performs mask processing corresponding to the shape of the shape portion 5a on the surface of the film material 11, and in the first round, the unmasked area (background) on the surface of the film material 11 subjected to mask processing. After the black paint is transferred to the part 5b) and the mask is removed and dried, the gray paint is transferred to the back surface of the film material 11 and dried in the second round.
- the concavo-convex shape is formed by the pressure forming dies 22, 23 at the position corresponding to the shape portion 5a of the long belt-like film material 11.
- the film material 11 placed at a predetermined position and softened by heating is sandwiched by the mold closing operation of the pressure forming molds 22 and 23, and a vacuum is formed between the mold 22 and the film material 11.
- the film material 11 is brought into close contact with the mold 22 by the pressure of the compressed air supplied from the mold 23 side, thereby forming an uneven shape.
- an uneven design having a height difference of about 5 mm is formed at a position corresponding to the shape portion 5a of the film material 11, a so-called central mark and an elliptical portion surrounding the mark.
- the first intermediate body 2 is formed from the film material 11 by a trimming device (not shown).
- the first intermediate body 2 includes a design part 5 including a shape part 5 a and a background part 5 b and is formed in a substantially elliptical shape in front view so as to correspond to the emblem 1, and near the outer peripheral end.
- the portion is provided with an edge 2a slightly extending radially outward.
- the radial dimension of the edge 2a is a dimension that remains slightly in the transparent resin layer forming step S2.
- the edge 2a is formed uniformly over the entire circumference of the first intermediate body 2.
- the edge portion 2a is provided with a pair of substantially rectangular recesses 2b recessed inward in the radial direction at both ends in the major axis direction, and a plurality of cut portions 2c extending in the radial direction over the entire circumference. .
- An extension 2d extending radially outward from the radially outer end of the edge 2a is formed in a portion of the edge 2a that faces a runner 38b described later.
- the extension portion 2d is set to a dimension that allows the tip portion to partially enter the runner 38b (see FIG. 11).
- the transparent resin layer forming step S ⁇ b> 2 includes a preparation step S ⁇ b> 21 for preparing the first and second molds 31 and 32, and an arrangement step S ⁇ b> 22 for arranging the first intermediate body 2 on the first mold 31.
- the restraint process S23 which positions and supports the first intermediate body 2 with respect to the first mold 31, the mold closing process S24, and the injection for injecting the transparent resin material 12 melted by the injection mechanism (not shown) into the cavity C1 Step S25, a first cooling step S26 for cooling the transparent resin material 12 at a first cooling rate K1, a mold opening step S27, a second cooling step S28 for cooling the second intermediate 6 at a second cooling rate K2, etc.
- the first and second molds 31 and 32 correspond to the transparent resin layer forming means.
- a first mold 31 that is a movable mold and a second mold 32 that is a fixed mold that forms the cavity C1 in cooperation with the first mold 31 are prepared.
- the first mold 31 is provided so as to be able to support the first intermediate body 2 in a substantially orthogonal posture with respect to the horizontal direction, and is configured to be able to adjust the mold temperature.
- the first mold 31 is provided with a vacuum pump 33 (suction mechanism) capable of vacuum suction of the first intermediate body 2, a main body 31a, and the main body 31a.
- a telescopic die 31b that can be inserted into the recess is provided.
- the telescopic die 31b is formed in the same shape as the planar shape of the shape portion 5a in plan view, and a part of the main body 31a is preloaded in one half of the telescopic die 31b.
- the main body 31a and the telescopic die 31b form a first suction passage 34a that is a divided gap (interval of about 0.05 mm) at a portion corresponding to the boundary portion between the shape portion 5a and the background portion 5b.
- All of the first suction passages 34a communicate with each other in an annular shape. Further, a second suction passage 34b is formed at a position in the vicinity of the downstream side of the convex portion 36 to be described later.
- the first mold 31 has a movable portion 31c, a plurality of grooves 34c that transmit the suction force of the vacuum pump 33 to the first and second suction passages 34a, 34b, and a uniform suction force distributed to the plurality of grooves 34c. And a convex portion 36 formed at a position corresponding to the upstream portion of the runner 38b of the main body 31a, a pair of locating pins 37 (positioning mechanism), and the like.
- the movable portion 31c is provided at the outer peripheral portion on the second mold 32 side excluding the position corresponding to the runner 38b of the main body 31a, and slightly (for example, about 1) from the main body 31a while being urged toward the second mold 32. .3 mm) apart.
- the urging force and the separation distance are set to values that allow the air in the cavity C1 in the injection step S25 to be discharged to the outside when the movable portion 31c is in contact with the second mold 32 with this urging force.
- the first mold 31 moves forward so that the movable portion 31c is closest to the main body 31a. It has been adjusted.
- the plurality of groove portions 34c are formed corresponding to the end portions of the first and second suction passages 34a and 34b, respectively.
- the distribution unit 35 communicates the first and second suction passages 34 a and 34 b with the vacuum pump 33.
- the distribution portion 35 is provided in a portion of the telescopic die 31b opposite to the second mold 32 (upstream portion of the first and second suction passages 34a and 34b), and is connected in parallel to the plurality of groove portions 34c. ing.
- the cubic convex portion 36 protrudes in the direction of the second mold 32 orthogonally from the main body 31 a at a position in the vicinity of the upstream side of the extended portion 2 d of the first intermediate body 2.
- 38b is formed so as to cross from one end side to the other end side in the mold surface direction.
- die 32 which comprises the convex part 36 and the runner 38b is equivalent to the flow direction change means of the transparent resin material 12.
- the pair of locating pins 37 are configured to be able to fit into a pair of recesses 2b formed at both ends in the major axis direction of the first intermediate body 2, respectively.
- the pair of locating pins 37 are formed so as to be able to advance and retract from the main body 31a in the direction of the second mold 32, respectively, and engage the receiving surface portion 3a of the transparent resin layer 3 to thereby perform the eject function of the second intermediate body 6. I have.
- the second mold 32 is provided so that the second intermediate body 6 can be molded in a state substantially orthogonal to the horizontal direction, and the mold temperature can be adjusted. Yes.
- the second mold 32 includes an injection mechanism, an introduction gate 38a that connects the injection mechanism and the side gate via a runner 38b, and a wall portion that constitutes a part of the runner 38b and faces the first mold 31. Etc. When the second mold 32 and the first mold 31 are closed, the first and second molds 31 and 32 cooperate to form the cavity C1 and the runner 38b, and the downstream end of the runner 38b. Forms a side gate.
- the introduction gate 38a is set so that the diameter dimension is increased toward the first mold 31.
- a volume chamber having a predetermined capacity is formed at the connecting portion with the runner 38b. It is configured as follows.
- the first intermediate body 2 is disposed at a specified position of the first mold 31 with the first and second molds 31 and 32 being separated from each other.
- the pair of recesses 2b formed in the first intermediate body 2 are respectively fitted to the pair of locating pins 37 and positioned.
- the first intermediate body 2 is sucked in the direction of the first mold 31 through the first suction passage 34a corresponding to the boundary portion between the shape portion 5a and the background portion 5b.
- the supporting ability is improved while maintaining the merchantability.
- the shape accuracy of the shape portion 5a can be increased by positively marking the boundary portion (ridge line portion).
- first suction passage 34a is annularly communicated with the shape portion 5a, so that the first intermediate body 2 is sucked and fixed with a uniform suction force over the entire area.
- the first intermediate body 2 positioned with respect to the main body 31a has an edge portion over substantially the entire circumference except for the edge portion 2a corresponding to the extension portion 2d by the mold closing by the first and second molds 31 and 32. Since 2a is clamped between the first and second molds 31, 32, it is securely held at the specified position.
- the movable portion 31c is separated from the main body 31a by a predetermined biasing force.
- the molten transparent resin material 12 heated to the injection temperature T1 is injected into the cavity C1.
- the molten transparent resin material 12 is injected from the injection mechanism and supplied into the cavity C1 through the introduction gate 38a and the runner 38b.
- the convex portion 36 causes the transparent resin material 12 flowing in the runner 38 b to be on the wall portion of the second mold 32 constituting a part of the runner 38 b in the direction opposite to the convex portion 36.
- the transparent resin material is changed so that the wall portion of the second mold 32 constituting a part of the runner 38b presses the extension portion 2d of the first intermediate body 2 toward the first mold 31. 12 flow directions are changed. Thereby, the suction force from the second suction passage 34 b and the pressing force from the transparent resin material 12 act on the extension portion 2 d of the first intermediate body 2 in the direction of the first mold 31.
- the contact pressure between the second mold 32 and the movable part 31c is adjusted to a predetermined value, so that the air in the cavity C1
- the transparent resin material 12 is discharged outside without obstructing the inflow of the transparent resin material 12. Thereby, air can be smoothly discharged
- the transparent resin material 12 is cooled from the injection temperature T1 to the mold temperature T2 at the first cooling rate K1. Thereby, the transparent resin layer 3 is shape
- the transparent resin material 12 is an amorphous synthetic resin
- the relationship between the glass transition temperature Tg and the mold temperature T2 in consideration of moldability can be expressed by the following formula (1).
- the temperature ranges are 250 ° C. ⁇ T1 ⁇ 320 ° C. and 105 ° C. ⁇ T2 ⁇ 125 ° C.
- the injection temperature T1 is 300 ° C.
- the mold temperature T2 is 120. Set to ° C.
- the temperature of the transparent resin material 12 is maintained at the injection temperature T1. Simultaneously with the end, cooling of the transparent resin material 12 is started.
- the first cooling rate K1 is set as the following equation (2) according to the relationship between the injection temperature T1, the mold temperature T2, and the cooling period (t3-t2).
- the cooling period (t3-t2) is set in advance for each type of transparent resin material 12 in consideration of molding efficiency and moldability.
- the pressure holding process is started simultaneously with the first cooling process S26.
- the first intermediate body 2 and the transparent resin layer 3 are held in the cavity C1 for a predetermined period in the period of the first cooling step S26.
- the mold opening step S27 is performed during a period from t3 to t4, and after the first mold 31 is moved backward so as to be separated from the second mold 32, the second intermediate body 6 is taken out.
- the transparent resin layer 3 of the second intermediate body 6 is provided with a rectangular receiving surface portion 3a recessed radially inward at a position corresponding to the recess 2b.
- the radially inner end portions of the locating pins 37 are formed so as to be able to engage with each other by partially overlapping the radially outer end portion of the second intermediate body 6.
- the receiving surface portion 3a is not limited to a rectangular (rectangular) concave portion, and may be a concave concave portion. In the case of the recessed portion due to the inclination, there is no sudden luminance change of the reflected light, and the merchantability can be improved by improving the appearance.
- the second intermediate body 6 taken out of the cavity C1 is cooled to room temperature (for example, 20 to 30 ° C.) at a second cooling rate K2 that is faster than the first cooling rate K1.
- the second intermediate body 6 taken out from the first mold 31 starts cooling at the end of the mold opening step S28 and is cooled for a period of t4 to t5.
- the amount of shrinkage between the first intermediate body 2 having a high heat shrinkage speed and the transparent resin layer 3 having a low heat shrinkage speed integrated with the first intermediate body 2 can be made uniform, and the peeling that occurs between the two. The occurrence of gaps due to the above is suppressed.
- the second cooling rate K2 of the second cooling step S28 exhibits a shrinkage promoting effect of the transparent resin layer 3 at 2 ° C./sec or more, and a high effect can be expected at 4 ° C./sec or more.
- the second intermediate 6 is immersed in room temperature water at the same time as being taken out from the first mold 31.
- the refrigerant of the second intermediate 6 only needs to be able to manage a predetermined cooling rate, may be cooled by water mist, or may be cooled by dry ice.
- the base resin layer forming step S ⁇ b> 3 includes a preparation step S ⁇ b> 31 for preparing the first and second molds 41 and 42, and an arrangement step for arranging the second intermediate body 6 in the first mold 41.
- S32, a restraining step S33 for positioning and supporting the second intermediate body 6 with respect to the first mold 41, a mold closing step S34, and a base resin material 13 melted by an injection mechanism (not shown) is injected into the cavity C2.
- dies 41 and 42 are equivalent to the base-material resin layer formation means.
- a first mold 41 that is a fixed mold and a second mold 42 that is a movable mold that forms the cavity C2 in cooperation with the first mold 41 are prepared.
- die 41 is provided so that the 2nd intermediate body 6 can be supported in the state of a substantially orthogonal attitude
- the first mold 41 includes a pair of openings 41a, a vacuum pump 43 (a suction mechanism) that can vacuum-suck the second intermediate body 6, and a pair of openings 41a.
- a vacuum pump 43 a suction mechanism
- the first mold 41 includes a pair of openings 41a, a vacuum pump 43 (a suction mechanism) that can vacuum-suck the second intermediate body 6, and a pair of openings 41a.
- a pair of suction passages 44 for transmitting the suction force of the vacuum pump 43 to each other
- a distribution portion 45 for uniformly distributing the suction force of the vacuum pump 43 for each passage, and the like.
- FIGS. 15a to 15d are cross-sectional views.
- the pair of openings 41a is configured to suck the transparent resin layer 3 of the second intermediate body 6, and is formed in a substantially bowl shape. These openings 41 a are arranged at substantially symmetrical positions so as to correspond to regions where the thickness from the surface of the transparent resin layer 3 to the first intermediate body 2 is thicker than the average thickness of the second intermediate body 6. In the present embodiment, a pair of openings 41a is disposed at a position corresponding to the position P (see FIG. 7) of the background portion 5b on both sides in the major axis direction with respect to the center of the second intermediate body 6.
- the pair of openings 41 a communicate with the vacuum pump 43 via a pair of suction passages 44 and a distributor 45.
- the distributor 45 has one end connected to the vacuum pump 43 and the other end connected in parallel to the upstream end of the pair of suction passages 44.
- the second mold 42 is provided so that the second intermediate body 6 can be molded in a state of being substantially orthogonal to the horizontal direction, and the mold temperature can be adjusted. Yes.
- the second mold 42 includes an injection mechanism (not shown) and an introduction gate 48 that communicates the injection mechanism with the cavity C2.
- an injection mechanism not shown
- an introduction gate 48 that communicates the injection mechanism with the cavity C2.
- the shape of the cavity C2 is such that the thickness of the final insert-molded product is substantially uniform and the base resin layer 4 that covers the surface of the edge 2a in the radial direction of the edge 2a of the first intermediate body 2 and the receiving surface 3a is formed. It is configured.
- the introduction gate 48 is formed so as to correspond to the central portion of the cavity C2, and is configured such that the diameter dimension increases toward the first mold 41 side.
- the second intermediate body 6 is arranged at a specified position of the first mold 41 with the first and second molds 41 and 42 being separated from each other.
- the transparent resin layer 3 is positioned so that the regions corresponding to the background portions 5b on both sides in the major axis direction (regions corresponding to the position P) are in contact with the pair of openings 41a.
- the second intermediate body 6 is sucked in the direction of the first mold 41 through the pair of openings 41a. Since the second intermediate body 6 is supported at a position substantially equally divided into three in the major axis direction, the support capability can be increased with an equal suction force.
- the molten base resin material 13 heated to the injection temperature T3 is injected into the cavity C2.
- the molten base resin material 13 is injected from the injection mechanism and supplied into the cavity C ⁇ b> 2 through the introduction gate 48.
- the injection temperature (melting temperature) T3 is 180 to 270 ° C., which is higher than the glass transition temperature Tg of polycarbonate, so there is concern about suction marks due to softening of the transparent resin layer 3.
- the generation of suction marks is avoided by supporting the molten base resin material 13 at a portion (region corresponding to the position P) where heat is hardly transmitted.
- a plurality of cut portions 2c extending in the radial direction are formed in the edge portion 2a of the first intermediate body 2, in addition to measures against wrinkles, wraparound to the surface side of the edge portion 2a of the molten base resin material 13 is performed. Increases sex.
- the base resin material 13 is cooled at a constant cooling rate from the injection temperature T3 to the mold temperature T4.
- the base resin layer 4 is formed by solidifying the molten base resin material 13.
- the temperature range is 40 ° C. ⁇ T4 ⁇ 80 ° C.
- the cooling rate of the cooling step S36 is set according to the relationship between the injection temperature T3, the mold temperature T4, and the cooling period.
- the cooling period is determined for each type of the base resin material 13 in consideration of the molding efficiency and moldability. Is set in advance.
- the pressure holding process is started simultaneously with the cooling process S36.
- the second intermediate body 6 and the base resin layer 4 are held in the cavity C2 for a predetermined period in the period of the cooling step S36.
- the mold opening step S37 after the second mold 42 is moved backward so as to be separated from the first mold 41, the final product emblem 1 is taken out by an eject mechanism (not shown), and the surface of the transparent resin layer 3 is removed. Hard coat treatment is applied to
- the edge part 2a of the 1 intermediate body 2 can be fixed with respect to the 1st, 2nd metal mold
- the movement of the film material 11 can be prevented, and wrinkling of the film material 11 can be prevented.
- the intermediate body forming step S1 a pair of concave portions 2b recessed inward in the radial direction is formed in the edge portion 2a.
- the first intermediate body 2 is positioned by the pair of concave portions 2b. The positioning accuracy of the first intermediate body 2 in the transparent resin layer forming step S2 can be improved.
- the first intermediate body 2 is positioned by the locate pin 37, and a receiving surface portion 3a recessed radially inward is formed at a position corresponding to the locate pin 37 of the transparent resin layer 3, and the base resin In the layer forming step S3, since the base resin layer 4 is formed so as to cover the receiving surface portion, it is possible to achieve both the positioning accuracy and the appearance improvement of the first intermediate body 2.
- the edge portion 2a is used to strengthen and fix the first intermediate body 2 by the first and second molds 31 and 32. Even when the length is extended, generation of wrinkles generated in the first intermediate 2 can be suppressed.
- the intermediate body forming step S1 an uneven shape is formed in the design portion 5, and in the base resin layer forming step S3, the base resin layer 4 is formed so that the thickness of the emblem 1 is uniform. In addition, radio wave transmission can be ensured.
- This insert molding apparatus is an insert molding apparatus for a film material 11 that forms the transparent resin layer 3 on the surface of the film material 11 provided with the design portion 5 and forms the base resin layer 4 on the back surface.
- a second intermediate body that includes an edge portion 2a that is formed in the vicinity of the outer peripheral end of the shape and extends radially outward, and has a transparent resin layer 3 formed by injection molding on the surface of the first intermediate body 2 to which the edge portion 2a is fixed.
- the first and second molds 31 and 32 that form the base 6 and the base resin layer 4 that covers the surface of the outer edge in the radial direction of the edge 2a by injection molding on the back surface of the second intermediate body 6 And first and second molds 41 and 42 for forming the.
- the surface of the first intermediate body 2 provided with the edge 2a extending radially outward and formed in the vicinity of the outer peripheral edge of the final shape of the film material 11 is fixed to the surface of the first intermediate body 2 to which the edge 2a is fixed by injection molding. Since it has the 1st, 2nd metal mold
- first and second molds 31, 32 are provided with a pair of locating pins 37 for positioning the first intermediate body 2 by a pair of recesses 2b recessed inward in the radial direction of the edge 2a, a transparent resin layer is formed.
- the positioning accuracy of the first intermediate body 2 in step S2 can be improved.
- the intermediate layer may be formed of a film material provided with a design part. It may be an insert-molded product formed by a shape part and a background part distinguished only by color. In this case, the color boundary portion between the shape portion and the background portion is formed so as to correspond to the division gap between the mold body and the nested die.
- a pair of recesses is formed at both ends in the major axis direction.
- the transparent resin layer is PC
- the film material is a specific material not containing heavy metal
- the base resin layer is ABS.
- any material that meets at least the design conditions may be used and can be arbitrarily selected. . 4)
- those skilled in the art can implement the present invention in a form in which various modifications are added to the above-described embodiment or in a form in which each embodiment is combined without departing from the gist of the present invention. Various modifications are also included.
Abstract
Description
従って、透明樹脂材12がポリカーボネートの場合、250℃≦T1≦320℃、105℃≦T2≦125℃の温度範囲とされ、本実施例では、射出温度T1を300℃、金型温度T2を120℃に設定している。
尚、冷却期間(t3-t2)は、成形能率と成形性とを考慮して透明樹脂材12の種類毎に予め設定されている。
1〕前記実施形態においては、形状部が凹凸形成された意匠部の例を説明したが、少なくとも3層構造において、中間層が意匠部を備えたフィルム材で形成されれば良く、意匠部が色彩のみで区別された形状部と背景部とにより形成されたインサート成形品であっても良い。この場合、形状部と背景部との色彩境界部が、金型本体と入子型間の分割隙間に対応するように形成する。
2〕前記実施形態においては、長径方向両端部に1対の凹部を形成した例を説明したが、少なくとも前後左右の位置決めができれば良く、矩形状の場合、1つの凹部であっても良い。3以上の凹部を設ける場合、角部のない断面円状のロケートピンであっても良い。
3〕前記実施形態においては、車両の外装品であるエンブレムの例を説明したが、車両の内装品に適用しても良く、また、車両以外の装飾品に適用可能である。
4〕その他、当業者であれば、本発明の趣旨を逸脱することなく、前記実施形態に種々の変更を付加した形態や各実施形態を組み合わせた形態で実施可能であり、本発明はそのような変更形態も包含するものである。
2 第1中間体
2a 縁部
2b 凹部
2c 切れ込み部
3 透明樹脂層
3a 受面部
4 基材樹脂層
5 意匠部
11 フィルム材
31 (透明樹脂層形成用)第1金型
32 (透明樹脂層形成用)第2金型
37 ロケートピン
41 (基材樹脂層形成用)第1金型
42 (基材樹脂層形成用)第2金型
S1 中間体形成工程
S2 透明樹脂層工程
S3 基材樹脂層工程
Claims (7)
- 意匠部を備えたフィルム材の表面に透明樹脂層を形成すると共に裏面に基材樹脂層を形成するフィルム材のインサート成形方法において、
前記フィルム材の最終形状の外周端近傍部に放射方向外側に延びる縁部を備えた第1中間体を形成する中間体形成工程と、
前記縁部が固定された第1中間体の表面に射出成形によって透明樹脂層を備えた第2中間体を形成する透明樹脂層形成工程と、
前記第2中間体の裏面に射出成形によって前記縁部の放射方向外側端部の表面を覆う基材樹脂層を備えたインサート成形品を形成する基材樹脂層形成工程と、
を有することを特徴とするフィルム材のインサート成形方法。 - 前記中間体形成工程において、前記縁部に放射方向内側に凹入した1又は複数の凹部を形成し、
前記透明樹脂層形成工程において、前記1又は複数の凹部により前記第1中間体を位置決めすることを特徴とする請求項1に記載のフィルム材のインサート成形方法。 - 前記透明樹脂層形成工程において、前記第1中間体をロケートピンで位置決めすると共に前記透明樹脂層のロケートピンに対応した位置に放射方向内側に凹設された受面部が形成され、
前記基材樹脂層形成工程において、前記基材樹脂層が前記受面部を覆うように形成されたことを特徴とする請求項1又は2に記載のフィルム材のインサート成形方法。 - 前記中間体形成工程において、前記縁部に放射方向に延びる複数の切れ込みを形成することを特徴とする請求項1~3の何れか1項に記載のフィルム材のインサート成形方法。
- 前記中間体形成工程において、前記意匠部に凹凸形状を形成し、
前記基材樹脂層形成工程において、前記インサート成形品の厚みが均一になるように前記基材樹脂層を形成することを特徴とする請求項1~4の何れか1項に記載のフィルム材のインサート成形方法。 - 意匠部を備えたフィルム材の表面に透明樹脂層を形成すると共に裏面に基材樹脂層を形成するフィルム材のインサート成形装置において、
前記フィルム材の最終形状の外周端近傍部に形成された放射方向外側に延びる縁部を備え且つ前記縁部が固定された第1中間体の表面に射出成形によって透明樹脂層を備えた第2中間体を形成する透明樹脂層形成手段と、
前記第2中間体の裏面に射出成形によって前記縁部の放射方向外側端部の表面を覆う基材樹脂層を備えたインサート成形品を形成する基材樹脂層形成手段と、
を有することを特徴とするフィルム材のインサート成形装置。 - 前記透明樹脂層形成手段が、前記縁部の放射方向内側に凹入した1又は複数の凹部により前記第1中間体を位置決めする位置決め機構を備えたことを特徴とする請求項6に記載のフィルム材のインサート成形装置。
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