WO2013145507A1 - 射出成形方法、射出成形金型装置、および成形品 - Google Patents

射出成形方法、射出成形金型装置、および成形品 Download PDF

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Publication number
WO2013145507A1
WO2013145507A1 PCT/JP2013/000136 JP2013000136W WO2013145507A1 WO 2013145507 A1 WO2013145507 A1 WO 2013145507A1 JP 2013000136 W JP2013000136 W JP 2013000136W WO 2013145507 A1 WO2013145507 A1 WO 2013145507A1
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WO
WIPO (PCT)
Prior art keywords
mold
cavity forming
forming surface
cavity
transfer film
Prior art date
Application number
PCT/JP2013/000136
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English (en)
French (fr)
Japanese (ja)
Inventor
英生 峯
隆彦 曽山
太士 丸一
Original Assignee
パナソニック株式会社
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Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to JP2014507348A priority Critical patent/JP5849202B2/ja
Priority to CN201380007159.XA priority patent/CN104093540B/zh
Publication of WO2013145507A1 publication Critical patent/WO2013145507A1/ja

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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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14827—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles using a transfer foil detachable from the insert

Definitions

  • a molten resin is injected into a molding space (cavity) of an injection mold to obtain a molded product by injection molding.
  • a transfer layer of a multilayer film disposed in the injection mold is molded.
  • the present invention relates to an injection molding method and an injection mold apparatus for forming a transfer layer on the surface of the molded article by transferring it onto the surface of the article, and a molded article obtained by the injection molding method or the injection mold apparatus. .
  • Patent Document 1 discloses an injection molding simultaneous painting apparatus that performs preheating on a transfer film disposed between a male mold and a female mold before injection molding. The configuration of this injection molding simultaneous painting apparatus is shown in FIG.
  • a long transfer film 131 having a transfer layer on a base film is moved between a male mold 133 and a female mold 134 constituting an injection mold by a foil feeding means 132.
  • Injection molding is performed every time one pitch is sent in between. Specifically, the male mold 133 and the female mold 134 are closed, molten resin is injected into a cavity formed by the mold closing, the molten resin in the cavity is cooled and solidified, and then the male mold 133 and the female die 134 are opened.
  • the injection molding simultaneous painting apparatus is also provided with a heating and taking-out means 139 having a molded product taking-out mechanism 137 and a heating mechanism 138 in the back direction.
  • the transfer film 131 is fed, and the heating / unloading means 139 is guided between the male mold 133 and the female mold 134, and the molded article taking-out mechanism 137 holds the molded article (simultaneous injection molded article) 136.
  • the heating mechanism 138 preliminarily heats the transfer film 131 fed between the male mold 133 and the female mold 134.
  • the heating / extracting means 139 is guided out of the mold.
  • This injection molding simultaneous painting apparatus is configured such that the molded product 136 can be removed from the molded product take-out mechanism 137 outside the mold. As described above, this injection molding simultaneous painting apparatus preheats the transfer film 131 using a short time during which the male mold 133 and the female mold 134 are opened.
  • Patent Document 2 a heating device is provided on the upper side of the injection mold composed of the A mold and the B mold, on the substantially same surface as the cavity forming surface of the A mold or the B mold.
  • a mold for simultaneous decorating is disclosed in which a transfer film is preheated at a stage on the upper side of the injection mold.
  • the transfer film can be stretched only to about 20% to 30% only by heating the transfer film before injection molding. For this reason, in the case of a deeply rising molded product (deep-drawn molded product) where the transfer film needs to be stretched further, the transfer film is sucked into the cavity forming surface, and after the mold closing process, the molten resin enters the cavity. A large tensile stress or a local tensile stress acts on the transfer film until it is filled.
  • FIG. 14 is a side sectional view showing a state in the middle of mold closing of a general injection mold apparatus.
  • the transfer film 143 is fed between the movable side mold 141 and the fixed side mold 142 constituting the injection mold, first, the foil pressing plate 144 moves to move the transfer film 143 together with the movable side mold 141. And the transfer film 143 is restrained. Thereafter, the movable mold 141 and the movable mold 141 are closed by moving the movable mold 141. At this time, the transfer film 143 comes into contact with the cavity forming surface 145 of the fixed mold 142, and the cavity forming surface 145 of the fixed mold 142 approaches the cavity forming surface 146 of the movable mold 141. It is drawn into the cavity while being stretched.
  • FIG. 15 is a plan view schematically showing the state of the transfer film 143 during mold closing.
  • the transfer film 143 is drawn into the cavity while being stretched.
  • the transfer film 143 receives a large tensile stress in the vicinity of the four cavity-shaped straight portions 151, which are straight portions at the outer edge of the cavity, and is stretched as shown by an arrow 152.
  • the transfer film 143 is locally thinned at the cavity-shaped linear portion 151 and the transfer film 143 is torn.
  • the color or pattern printed on the transfer layer of the transfer film 143 may deteriorate.
  • the outer edge of the cavity is the edge of the concave cavity forming surface 146 of the movable mold 141 or the boundary between the mating surface of the fixed mold 142 and the cavity.
  • the transfer film 143 is in the middle of mold closing, It receives a smaller tensile stress than that near the cavity-shaped straight portion 151. Therefore, the amount of the transfer film 143 drawn into the cavity from the cavity shape corner portion 153 is smaller than the amount of the transfer film 143 drawn into the cavity from the cavity shape straight portion 151. As a result, as indicated by an arrow 154 in the vicinity of the cavity-shaped corner portion 153, compressive stress is generated in the transfer film 143, and wrinkles 155 are generated in the transfer film 143.
  • the amount of the transfer film drawn into the cavity is larger than that of a molded product having a shallow rise (molded product having a shallow drawing shape), and thus the range in which wrinkles 155 are generated is widened. The amount of wrinkles 155 is also increased.
  • the present invention requires a transfer layer in the surface of a deep-drawn shaped molded product without causing tears or wrinkles on the transfer film and without deteriorating the color or pattern printed on the transfer layer. It is an object of the present invention to provide an injection molding method and an injection mold apparatus capable of transferring a transfer layer to an appropriate part. Another object of the present invention is to provide a molded article in which a transfer layer that is free of tears and wrinkles and has no deterioration in printed color or pattern is transferred to a necessary location.
  • One aspect of the injection molding method of the present invention is that a first mold provided with a first cavity forming surface and a second mold provided with a second cavity forming surface are brought close to each other to form a base film and its base A transfer film having a transfer layer on the film is sandwiched between the first mold and the second mold, and the transfer film is restrained, and at the same time, a concave shape is formed by the first cavity forming surface and the second cavity forming surface. Forming the cavity forming surface, and closing the first mold, the second mold, and the third mold provided with the third cavity forming surface to form the first to third molds.
  • Forming a molding space by a cavity forming surface injecting a resin into the molding space formed by the first to third cavity forming surfaces, the first mold, the second mold, and the first 3 Open the mold Is that having a, obtaining a molded article which has been transferred to the part of the separation and said transfer layer is the surface from the base film.
  • one aspect of the injection mold apparatus includes a first mold provided with a first cavity forming surface, and a second cavity forming that forms a concave cavity forming surface together with the first cavity forming surface.
  • a second mold provided with a surface, and a third mold provided with a third cavity forming surface that forms a molding space together with the concave cavity forming surface, the first mold and the first mold.
  • a transfer film having a base film and a transfer layer on the base film is sandwiched and restrained by the first mold and the second mold, and at the same time, the first mold
  • the concave cavity forming surface is formed by the first cavity forming surface and the second cavity forming surface.
  • the other side surface of the injection mold apparatus of the present invention includes an end portion on the first cavity forming surface side of the mating surface of the first mold and the second cavity forming surface of the mating surface of the second mold. That is, an inclined surface is provided at each end portion on the side.
  • another side surface of the injection mold apparatus of the present invention is that a projection shape is provided on at least one of the mating surface of the first mold and the mating surface of the second mold.
  • One aspect of the molded article of the present invention includes a transfer layer and a surface having a portion on which the transfer layer is formed, and the transfer layer is formed on a part of the surface. And a step for lowering the portion where the transfer layer is formed, and the step is an inclined surface or a curved surface.
  • a transfer layer is formed on a part of the surface of a deep-drawn shaped molded product without causing tears and wrinkles on the transfer film and without deteriorating the color or pattern printed on the transfer layer. Can be transferred. Therefore, according to the present invention, it is possible to apply a high-quality decoration or a high-quality functional film to a portion of the surface of a deep-drawn molded product that requires a transfer layer.
  • FIG. 3 is a side cross-sectional view showing an outline of a main part of a configuration example of an injection mold apparatus according to Embodiment 1.
  • FIG. 3 is a side sectional view showing a state when the mold of the injection molding die apparatus in the first embodiment is closed.
  • 3 is a flowchart illustrating an example of an injection molding method according to Embodiment 1.
  • 3 is a cross-sectional view of a molded product in Embodiment 1.
  • FIG. It is a sectional side view which shows the state at the time of mold closing of a general injection molding die apparatus. It is a figure which expands and shows a part of FIG. It is sectional drawing of a general deep drawing shaped molded article.
  • FIG. 1 is a side cross-sectional view showing an outline of a main part of a configuration example of an injection mold apparatus according to Embodiment 1.
  • FIG. 3 is a side sectional view showing a state when the mold of the injection molding die apparatus in the first embodiment is closed.
  • FIG. 6 is a side sectional view showing a state when the mold of the injection mold apparatus in the second embodiment is closed. It is a figure which expands and shows the A section of FIG. 6 is a cross-sectional view of a molded product in Embodiment 2.
  • FIG. It is a figure which expands and shows a part of FIG.
  • FIG. 9 is a partially enlarged side sectional view showing a state of the injection molding die device in Embodiment 3 when the mold is closed.
  • It is a block diagram of a general injection mold apparatus. It is a sectional side view which shows the state in the middle of mold closing of a general injection molding die apparatus. It is a top view which shows typically the state of the transfer film in the middle of mold closing of a general injection molding die apparatus.
  • (Embodiment 1) 1 is a side sectional view showing a main part of one configuration example of an injection molding die apparatus according to Embodiment 1.
  • FIG. 1 is a side sectional view showing a main part of one configuration example of an injection molding die apparatus according to Embodiment 1.
  • An injection mold apparatus 10 shown in FIG. 1 includes a main movable mold 11 that is an example of a first mold, an annular sub movable mold 12 that is an example of a second mold, and a third mold. And a fixed mold 13 which is an example of the above.
  • the sub movable mold 12 is disposed between the main movable mold 11 and the fixed mold 13.
  • the main movable side mold is provided by a foil feeding means (not shown).
  • a transfer film 14 is transported between 11 and the sub movable mold 12.
  • the main movable mold 11 is provided with a shallow concave cavity forming surface 15a which is an example of a first cavity forming surface.
  • the annular secondary movable mold 12 approaches the main movable mold 11, sandwiches the transfer film 14 together with the main movable mold 11 around the concave cavity forming surface 15 a, and restrains the transfer film 14. To do. Therefore, the transfer film 14 is restrained between the mating surface of the main movable mold 11 and the mating surface of the sub movable mold 12.
  • the sub movable mold 12 serves as a foil pressing plate.
  • FIG. 2 is a side sectional view showing a state of the injection mold apparatus 10 according to the first embodiment when the mold is closed.
  • the main movable mold 11 and the sub movable mold 12 are integrated into the fixed side.
  • Approaching the mold 13, the main movable mold 11, the sub movable mold 12, and the fixed mold 13 are closed.
  • the fixed mold 13 is formed with a convex cavity forming surface which is an example of a third cavity forming surface.
  • a deep concave cavity forming surface is formed by the shallow concave cavity forming surface 15a formed in the main movable mold 11 and the inner peripheral surface 15b of the annular sub movable mold 12. . Therefore, here, the inner peripheral surface 15b of the sub movable mold 12 is an example of a second cavity forming surface. Then, the convex cavity forming surface 15c of the fixed mold 13 protrudes into the deep concave cavity forming surface to form a deeply rising (deep drawing shape) molding space (cavity). Thus, the inner peripheral surface 15b of the sub movable mold 12 is a cavity forming surface, and plays the role of a side surface of the deep concave cavity forming surface. The molten resin is filled into the cavities formed by the cavity forming surfaces 15a to 15c from the resin injection holes 16 formed in the fixed mold 13.
  • the movable side mold is divided into the main movable side mold 11 and the sub movable side mold 12.
  • a split surface different from the split surfaces of the movable mold and the fixed mold in a general injection mold apparatus is formed on the movable mold.
  • the transfer film 14 is restrained by the dividing surface of the divided movable mold.
  • the transfer film 14 can be stretched from a position shallower than the upper end of the cavity shape toward the bottom surface of the cavity shape. Therefore, even if the molded product has a deep drawing shape, the transfer film 14 does not have a deep drawing shape.
  • the transfer film 14 can be formed in a shallow drawing shape that is nearly flat and can be along the bottom surface side of the cavity (cavity forming surface 15 a).
  • the transfer film 14 is vacuum-sucked from a vacuum suction hole (not shown) in which one end surface is disposed on the cavity forming surface 15a of the main movable mold 11.
  • FIG. 3 is a flowchart showing an example of the injection molding method (injection molding simultaneous foil transfer method) in the first embodiment.
  • step S1 a long transfer film 14 having a transfer layer on a base film is fed into the mold by one pitch (desired distance). At this time, the transfer film 14 is conveyed between the main movable mold 11 and the sub movable mold 12.
  • step S ⁇ b> 2 the annular secondary movable mold 12 moves to sandwich the transfer film 14 together with the main movable mold 11 and restrains the transfer film 14. Thereafter, in step S ⁇ b> 3, the transfer film 14 is vacuum-sucked toward the cavity forming surface 15 a side of the main movable mold 11.
  • step S4 first, the main movable side mold 11, the sub movable side mold 12, and the fixed side mold 13 are closed, and the shallow movable cavity forming surface 15a of the main movable side mold 11 is closed.
  • a deep-drawn cavity is formed by the cavity forming surface 15 b that is the inner peripheral surface of the sub movable mold 12 and the convex cavity forming surface 15 c of the fixed mold 13.
  • molten resin is injected into the cavity.
  • the molten resin filled in the cavity is cooled and solidified.
  • step S5 first, the main movable mold 11, the sub movable mold 12, and the fixed mold 13 are opened. Thereby, the base film 14a of the transfer film 14 is peeled from the molded product attached to the convex cavity forming surface 15c of the fixed-side mold 13. Thereafter, a deep-drawn molded product (injection molded product) having the transfer layer 14b of the transfer film 14 transferred to only a part of the surface is taken out of the mold.
  • FIG. 4 is a cross-sectional view of a deep-drawn molded product obtained by the injection mold apparatus 10 in the first embodiment.
  • the film transfer layer 18 composed of the transfer layer 14b of the transfer film 14 is formed not only on the entire surface of the molded product 17 but on only a part thereof.
  • the transfer layer 14b of the transfer film 14 is transferred only to the surface of the bottom surface portion 17a of the molded product 17 and the surface of the side surface portion 17b of the molded product 17 on the side of the bottom surface portion 17a.
  • a film transfer layer 18 composed of the transfer layer 14 b of the transfer film 14 stretched in a shallow drawing shape that is nearly flat is formed on a part of the surface of the molded product 17.
  • the annular side surface of the cavity forming surface 15 a of the main movable mold 11 is formed on the base film 14 a of the transfer film 14 more than the annular cavity forming surface 15 b of the sub movable mold 12. It is preferable that the film is disposed on the outer side by the film thickness. In this manner, the side surface of the cavity forming surface 15a of the main movable mold 11 projects outward, so that the film transfer layer 18 formed on the molded product 17 is conspicuous from the surface of the molded product 17 as shown in FIG. Therefore, the appearance quality of the molded product 17 is improved.
  • the transfer film 14 can be stretched from a position shallower than the upper end of the cavity shape toward the bottom surface of the cavity shape. Therefore, according to the first embodiment, even if the molded product 17 has a deep-drawn shape, the color or pattern printed on the transfer layer of the transfer film 14 without generating tears or wrinkles on the transfer film 14.
  • the transfer layer 14b of the transfer film 14 can be transferred to a portion (a part of the surface) where the film transfer layer 18 is necessary in the molded product 17 without deteriorating the above.
  • FIG. 5 is a side sectional view showing a state of a general injection mold apparatus when the mold is closed.
  • FIG. 6 is an enlarged view of a part of FIG. Specifically, FIG. 6 is an enlarged view showing a boundary (parting line) 53 between the cavity forming surface 51 a of the movable mold 51 and the cavity forming surface 52 a of the fixed mold 52 and a cross section around the boundary 53. Yes.
  • the general injection mold apparatus shown in FIGS. 5 and 6 has a deep rise due to the deep concave cavity forming surface 51 a of the movable mold 51 and the convex cavity forming surface 52 a of the fixed mold 52.
  • a forming space deep drawing shape forming space
  • the transfer film 54 is sandwiched and restrained between the mating surface of the movable mold 51 and the mating surface of the fixed mold 52. For this reason, the transfer film 54 is extended from the annular parting line (cavity-shaped outer edge) 53 of the injection mold toward the bottom surface of the cavity shape.
  • FIG. 7 is a cross-sectional view of a deep-drawn shaped molded product obtained by a general injection mold apparatus.
  • the annular projection shape 55 is generated in the molding space (the outer edge of the cavity shape).
  • a deep-drawn shaped product 71 obtained by a general injection mold apparatus has a boundary (cavity between the cavity forming surface 51a and the cavity forming surface 52a forming the molding space.
  • An annular protrusion shape 72 is formed at a location corresponding to the outer edge 53 of the shape. The protruding shape 72 appears remarkably in the case of a deeply rising molded product (deep-drawn molded product).
  • This protrusion shape 72 causes the user of the molded product 71 to be injured and the appearance quality of the molded product 71 to be impaired. For this reason, when a general injection mold apparatus is used, it is necessary to perform a process of removing the protrusion shape 72 in a step subsequent to the injection molding simultaneous foil transfer process.
  • a film transfer layer 73 is formed on the entire surface (transfer surface) of the molded product 71 obtained by a general injection mold apparatus.
  • the cavity forming surface of the main movable mold 11 is used to obtain a deep-drawn molded product having no projection shape or a small projection shape.
  • An inclined surface is provided on the mating surface of the main movable mold 11 and the mating surface of the sub movable mold 12 along the boundary (parting line) between 15a and the cavity forming surface 15b of the sub movable mold 12. Yes.
  • FIG. 8 is a side sectional view showing a state when the mold of the injection molding die apparatus in the second embodiment is closed.
  • FIG. 9 is an enlarged view of a portion A in FIG. 8. The boundary (parting line) between the cavity forming surface 15 a of the main movable mold 11 and the cavity forming surface 15 b of the sub movable mold 12 and the boundary thereof. The cross section of the periphery is shown enlarged.
  • the bottom surface of the cavity forming surface 15 a of the main movable mold 11 is formed at the cavity side end of the mating surfaces 19 and 19 of the main movable mold 11 and the sub movable mold 12.
  • annular angle surfaces (inclined surfaces) 20 and 20 that are inclined at an angle of 30 degrees or more are formed. Therefore, when the transfer film 14 is stretched from the mating surfaces 19 and 19 of the main movable mold 11 and the sub movable mold 12 along the shallow concave cavity forming surface 15a of the main movable mold 11.
  • An R-shaped portion (arc-shaped portion) is formed on the transfer film 14 at the annular boundary (parting line) between the cavity forming surface 15a of the main movable mold 11 and the cavity forming surface 15b of the sub movable mold 12.
  • the angular surface (inclined surface) 20 of the sub-movable mold 12 is along the annular R-shaped portion, the annular protrusion shape generated in the cavity (molding space) along the R-shaped portion of the transfer film 14 Smaller or preferably such protrusion shapes do not occur in the cavity.
  • annular angle surface (inclined surface) 20 that is inclined toward the bottom surface of the cavity forming surface 15a of the main movable side mold 11 is formed on the mating surface 19 of the main movable side mold 11, such a case.
  • the transfer film 14 has an annular boundary (parting line) between the cavity forming surface 15 a of the main movable mold 11 and the cavity forming surface 15 b of the sub movable mold 12. It won't be bent suddenly.
  • the transfer film 14 since the tensile stress acting on the transfer film 14 is relieved, the transfer film 14 does not have to be locally thinned at the boundary between the cavity forming surface 15a and the cavity forming surface 15b as compared with the case where the angle surface 20 is not provided. . Therefore, even if an annular R-shaped portion (arc-shaped portion) is formed on the transfer film 14, the annular protrusion shape generated in the cavity (molding space) along the R-shaped portion of the transfer film 14 is an angular surface. Compared to the case without 20 Or, preferably, such a protrusion shape does not occur in the cavity.
  • the transfer film 14 is stretched from a position shallower than the outer edge of the deep-drawn cavity shape.
  • the tensile stress acting on the transfer film 14 is relaxed as compared with the case where the transfer film is stretched from the outer edge of the deep-drawn cavity shape to the deep-drawn shape. Therefore, the annular protrusion shape generated in the cavity (molding space) along the R-shaped portion of the transfer film 14 is reduced, or preferably, such a protrusion shape does not occur in the cavity.
  • the annular side surface of the cavity forming surface 15 a of the main movable mold 11 is formed on the base film 14 a of the transfer film 14 more than the annular cavity forming surface 15 b of the sub movable mold 12. It is preferable that the film is disposed on the outer side by the film thickness.
  • FIG. 10 is a cross-sectional view of a deep-drawn molded product obtained by the injection mold apparatus 10 in the second embodiment.
  • FIG. 11 shows an enlarged part of FIG. Specifically, FIG. 11 shows an enlarged cross-sectional view of the boundary between the portion where the film transfer layer 18 is formed and the portion where the film transfer layer 18 is not formed and the periphery of the boundary in the molded article 17. .
  • the annular protrusion shape generated in the cavity (molding space) along the R-shaped portion of the transfer film 14 is reduced, or preferably, such a protrusion shape does not occur in the cavity. Therefore, as shown in FIGS. 10 and 11, the boundary between the portion where the film transfer layer 18 is formed and the portion where the film transfer layer 18 is not formed, that is, the cavity forming surface 15 a of the main movable mold 11.
  • the user of the molded product 17 may be injured on the surface of the molded product 17, or the molded product 17
  • the shape of the annular protrusion having such a size as to cause the appearance quality of the product to be damaged is not generated. Or preferably, no such protrusion shape occurs. For this reason, it is not necessary to provide a process of removing the protrusion shape as a subsequent process of the injection molding simultaneous foil transfer process.
  • the film thickness of the base film 14a of the transfer film 14 is such that the annular side surface of the cavity forming surface 15a of the main movable mold 11 is more than the annular cavity forming surface 15b of the sub movable mold 12. It is arranged on the outside by that amount. As a result, as shown in FIGS. 10 and 11, the film transfer layer 18 formed on the molded product 17 does not protrude prominently from the surface of the molded product 17, so that the appearance quality of the molded product 17 is improved.
  • the portion where the film transfer layer 18 is formed on the surface of the molded article 17 (the transfer film 14 An annular step 21 is formed which lowers the portion where the transfer layer 14b is transferred) than the portion where the film transfer layer 18 is not formed.
  • the step 21 is an inclined surface or a curved surface.
  • the transfer film 14 can be stretched from a position shallower than the upper end of the cavity shape toward the bottom surface of the cavity shape. Thereby, even if the molded product 17 has a deep-drawn shape, the transfer film 14 is not torn or wrinkled, and the color or pattern printed on the transfer layer 14b of the transfer film 14 is not deteriorated. It becomes possible to transfer the transfer layer 14b of the transfer film 14 to a portion (a part of the surface) where the film transfer layer 18 is necessary in the molded product 17.
  • the second embodiment it is possible to obtain a deep-drawn molded product 17 having no protrusion shape or a small protrusion shape. Therefore, the user of the molded product 17 is not injured, and the appearance quality of the molded product 17 is not impaired. Further, it is not necessary to provide a process for removing the protrusion shape.
  • the angle surface 20 may be provided annularly along the parting line, or may be provided partially along the parting line within a range that does not substantially depart from the effects of the present invention.
  • FIG. 12 is a partially enlarged side sectional view showing a state of the injection mold apparatus according to the third embodiment when the mold is closed.
  • the cavity forming surface 15a of the main movable mold 11 and the cavity of the sub movable mold 12 are shown.
  • a boundary (parting line) of the formation surface 15b and a cross section around the boundary are shown enlarged.
  • an annular convex shape 22 or a convex portion (on the mating surface 19 on the main movable side mold 11 side of the sub movable side mold 12 ( (Protrusions or protrusions) are locally provided. Therefore, when the injection mold is closed, the transfer film 14 is locally compressed by the annular convex shape 22 or the convex portion on the mating surfaces 19 and 19 of the main movable side mold 11 and the sub movable side mold 12. Under stress. Thereby, when the transfer film 14 is stretched from the mating surfaces 19 and 19 of the main movable mold 11 and the sub movable mold 12 along the shallow concave cavity forming surface 15a of the main movable mold 11.
  • the film 14 is pushed and filled into the R-shaped part. Therefore, the annular protrusion shape generated in the cavity (molding space) along the R-shaped portion of the transfer film 14 is reduced, or preferably, such a protrusion shape does not occur in the cavity.
  • the annular convex shape 22 or the convex portion is preferably provided in the vicinity of the annular cavity forming surface 15b along the annular cavity forming surface 15b.
  • the height of the annular convex shape 22 or the convex portion can be selected from the range of 0.1 mm to 1.0 mm, for example. Further, the width of the annular convex shape 22 or the convex portion can be selected from the range of 2.0 mm to 5.0 mm, for example.
  • the third embodiment as in the second embodiment described above, it is possible to obtain a deep-drawn molded product 17 having no protrusion shape or a small protrusion shape. Therefore, the user of the molded product 17 is not injured, and the appearance quality of the molded product 17 is not impaired. Further, it is not necessary to provide a process for removing the protrusion shape.
  • FIG. 12 illustrates a structure in which a local convex shape 22 or a convex portion (projection shape or projection portion) is formed on the mating surface 19 of the sub-movable mold 12, but an annular convex shape is illustrated.
  • 22 or the convex portion may be provided on the mating surface 19 of the main movable mold 11, or may be provided on the mating surfaces 19 and 19 of both the main movable mold 11 and the sub movable mold 12.
  • providing the convex shape 22 or the convex portion on the mating surface 19 of the sub movable mold 12 more reliably pushes the transfer film 14 into the R-shaped portion (arc-shaped portion) of the transfer film 14, and the R The shape film can be filled with the transfer film 14.
  • the convex shape 22 or the convex portion may be provided in a ring shape along the parting line, or may be provided partially along the parting line within a range that does not substantially depart from the effect of the present invention.
  • the injection molding method and the injection mold apparatus according to the present invention are a deep-drawn molded product without causing tears or wrinkles on the transfer film, and without deteriorating the color or pattern printed on the transfer layer.
  • the transfer layer can be transferred to a part of the surface of the film, and is useful for injection molding of various exterior molded products.
  • the molded product according to the present invention can improve the appearance quality, and is useful for various exterior molded products.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
PCT/JP2013/000136 2012-03-28 2013-01-16 射出成形方法、射出成形金型装置、および成形品 WO2013145507A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2014507348A JP5849202B2 (ja) 2012-03-28 2013-01-16 射出成形金型装置と射出成形方法
CN201380007159.XA CN104093540B (zh) 2012-03-28 2013-01-16 注塑成型方法及注塑成型模具

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