WO2012132597A1 - Dispositif de moule pour moulage multicouche et article moulé multicouche - Google Patents

Dispositif de moule pour moulage multicouche et article moulé multicouche Download PDF

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Publication number
WO2012132597A1
WO2012132597A1 PCT/JP2012/053511 JP2012053511W WO2012132597A1 WO 2012132597 A1 WO2012132597 A1 WO 2012132597A1 JP 2012053511 W JP2012053511 W JP 2012053511W WO 2012132597 A1 WO2012132597 A1 WO 2012132597A1
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WIPO (PCT)
Prior art keywords
layer
molded article
multilayer
mold
gate
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PCT/JP2012/053511
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English (en)
Japanese (ja)
Inventor
裕司 東村
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南部化成株式会社
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Priority to JP2013507250A priority Critical patent/JP5746754B2/ja
Publication of WO2012132597A1 publication Critical patent/WO2012132597A1/fr

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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
    • B29C45/03—Injection moulding apparatus
    • B29C45/04—Injection moulding apparatus using movable moulds or mould halves
    • B29C45/0441—Injection moulding apparatus using movable moulds or mould halves involving a rotational movement
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0027—Gate or gate mark locations
    • 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
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses

Definitions

  • the present invention relates to a mold apparatus for performing multilayer molding and a multilayer molded article molded thereby.
  • Projector lenses such as LED illumination
  • whose demand has been increasing in recent years are thick lenses of 12 mm or more in light collection characteristics.
  • a long cooling time is required to reduce the influence of the optical characteristics of the sink marks generated in the largest thickness portion.
  • a multilayer molding technique has been proposed.
  • Patent Document 1 discloses a plurality of molds in which the thickness is successively increased from one surface side in the thickness direction of the resin thick lens, and finally reaches a specified thickness.
  • a multi-layering technique has been disclosed in which resin is injected several times for each mold while forming and replacing the mold on this one side.
  • Patent Document 2 discloses a multi-layering technique in which a convex lens having a thickness of about 1 ⁇ 2 of the thickness of a convex lens finally obtained is secondarily molded as an insert to form a convex lens having substantially the same curvature as the insert. It is disclosed.
  • the present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a multi-layer molding die apparatus capable of facilitating mold design and improving optical characteristics in lens molding. Do.
  • the volume (volume) of one or more first cavity blocks forming one side of a mold cavity with the same shape and size, and that of the other mold cavity on the other side of the mold cavity And a second cavity block formed of protrusions or recesses different in height (depth) and paired with the first cavity block, one or more first template plates for fixing the first cavity block, and A second cavity block is fixed and formed of a second mold plate paired with the first mold plate, and all of the first cavity block and the second cavity block are formed by mold-matching with each other, and the volumes are mutually different.
  • An intermediate molded product formed by injecting a molten resin into each of a plurality of (N) different mold cavities is sequentially transferred to the mold cavity having a larger volume of the mold cavity.
  • the respective gates for supplying the molten resin to the respective mold cavities in the respective mold alignment states up to the mold alignment state for the (N-1) -th layer before the N-th layer molding where the volume is maximum are:
  • the molten resin is placed in a mold cavity in a mold-aligned state for forming the Nth layer, which is provided at a position where the gate mark of the gate does not appear on the outer surface of the multilayer molded article and the volume of the mold cavity becomes maximum.
  • a gate for supplying H.sub.2 is provided at a position corresponding to the outer surface of the multilayer molded article.
  • the gate mark of the gate for molding each layer is provided so as not to appear on the outer surface of the multilayer molded product, the installable area of the gate becomes relatively wide. Therefore, the metal mold can be easily designed, and the gate can be provided at a position and a state optimum for the formation of each layer, and the excellent effect that the degree of freedom of molded product design is improved and the design becomes easy.
  • the gate mark of each gate from the first layer to the (N-1) layer is covered by the later layer forming and the forming of the N layer, each of the first layer to the (N-1) layer is covered The gate marks and the interface of the intermediate molded product are melted, and the minute unevenness and residual stress disappear. Therefore, in the case where the multilayer molded product is an optical product such as a lens or the like, an excellent effect of being able to manufacture a multilayer molded product with excellent optical characteristics is exhibited.
  • the depth dimension of the recesses which form one side of each of the mold cavities and which have the same shape and the same dimensions as all other members of the respective mold cavities is the largest depth of the respective recesses. It is characterized in that it is smaller than the height dimension.
  • the present invention is characterized in that the gate provided at a position where a gate mark does not appear on the outer surface of the multilayer molded article is a pin gate or a hot runner.
  • the gate mark is relatively small, coating by the subsequent layer can be easily performed, and a multilayer molded article having excellent optical properties can be obtained, and separation of the intermediate molded article at the gate is facilitated to perform multilayer molding. Improve the process efficiency.
  • the difference between the maximum height or depth of the protrusion or recess for forming the Nth layer and the maximum height or depth of the protrusion or recess for forming the (N-1) th layer is It is characterized in that it is configured to be smaller than the same difference between any layers in younger layer order.
  • the present invention relates to a multilayer molded article molded by using the above-mentioned multilayer molding mold apparatus, in which the gate mark of the gate on which the N-th layer is molded is exposed on the outer surface, and the other layer is molded. It is characterized in that the mark is not exposed.
  • the multilayer molded article of the present invention exhibits an excellent effect of being excellent in appearance since the gate mark is exposed only at one place. Furthermore, the gate mark of the gate of the inner layer, which is essential for such a configuration, melts and disappears at the interface, and only the gate mark of the gate forming the Nth layer is exposed on the outer surface. The excellent effect of not deteriorating the characteristics is exhibited.
  • the present invention is a multilayer molded article molded using the multilayer molding die apparatus, wherein the outer peripheral end of the multilayer molded article is formed into one or two layers, and the outer peripheral end of the multilayer molded article The portion except for is formed in the N layer.
  • the outer peripheral end is formed with one layer or two layers although the portion other than the outer peripheral end is a multilayer of three or more layers. That is, since the portion other than the outer peripheral end is multi-layered, the original function is exhibited, and the outer peripheral end requiring only the function as the attachment member is formed in the necessary minimum shape while maintaining the formability. Can. Therefore, the multilayer molded article of the present invention exhibits an excellent effect of being functionally, characteristically and appearanceally good.
  • the present invention is a multilayer molded article molded using the above-described multilayer molding mold device, wherein one surface of the multilayer molded article has a small curvature or a planar shape as a first layer of multilayer molding.
  • the other surface of the multilayer molded article is characterized in that it has a curvature larger than the curvature of the one surface, which is the Nth layer of multilayer molding.
  • the mold apparatus for molding such a multilayer molded article according to the present invention can reduce the processing cost of the concave portion on the side having the same shape and the same dimension, thereby reducing the processing cost. Therefore, the mold apparatus can be manufactured at low cost, and the multilayer molded product of the present invention has an excellent effect of reducing the cost.
  • the present invention is characterized in that the multilayer molded article is an optical lens.
  • FIG. 1 is a side view of a partial cross section showing the configuration of an embodiment of the mold apparatus of the present invention.
  • FIG. 2 is a front view showing the state of a first cavity block which is opened after injection in the case of eight mold cavities (eight layers).
  • FIG. 3A is an enlarged front view showing the mold cavity (eighth layer) portion of FIG. 2 in detail.
  • 3B is a cross-sectional view taken along the line IIIA-IIIA of FIG. 3A showing the mold cavity (eighth layer) of FIG.
  • FIG. 4A is a front view of a mold cavity showing a first modification of the gate in FIG.
  • FIG. 4B is a cross-sectional view of a mold cavity showing a first modified embodiment of the gate in FIG.
  • FIG. 5 is a cross-sectional view of a mold cavity showing a second modified embodiment of the gate in FIG.
  • FIG. 6 is a cross-sectional view of a mold cavity showing a third modification of the gate in FIG.
  • FIG. 7 is a perspective view of a multilayer molded article molded by the mold apparatus shown in FIGS. 1 to 5.
  • FIG. 8 is a side view of a multilayer molded article having two outer peripheral ends.
  • FIG. 9 is a perspective view with a partial cross section of a multilayer molded article molded by a mold apparatus provided with a gate according to a fourth modified embodiment.
  • the mold apparatus 1 includes a pair of a first cavity block 2 and a second cavity block 3 which form a mold cavity 6 by molding together, and a first cavity block 2. And the second mold plate 5 for fixing the first mold plate 4 and the second cavity block 3.
  • Providing a plurality of mold cavities 6 in the pair of first cavity blocks 2 and second cavity blocks 3 as shown in FIG. 1 is effective in terms of improving economy and workability.
  • one mold cavity may be provided in the pair of first cavity blocks and the second cavity block.
  • the first template and the second template fix the first cavity block and the second cavity block in the same number as the number (N) of layers of the multilayer molded product to be obtained.
  • first cavity block and a second cavity block having one or more mold cavities may be fixed to one or more pairs of first and second mold plates, respectively.
  • first and second templates either all pairs of first and second templates should be attached to the same clamping device, or Either configuration of distributed attachment of some pairs to other clamping devices is feasible.
  • the number of mold cavities, the number of pairs of first cavity block and second cavity block, the number of pairs of first template and second template, and the number of clamping devices can be all implemented as long as the mold cavity is disposed with predetermined requirements as described later, and these are included in the scope of the present invention.
  • the mold cavity 6 has one side formed in the first cavity block 2 and the other side formed in the second cavity block 3 as the first cavity block 2 and the second cavity block 3. It is formed by unifying by molding with.
  • the number of mold cavities 6 is the same as the number (N) of layers of the multilayer molded article molded by the mold apparatus 1.
  • the recesses forming one side of the mold cavity 6 in the first cavity block 2 have the same shape and the same size.
  • the protrusion 12 forming the other side of the mold cavity 6 in the second cavity block 3 has a height dimension smaller than the depth dimension of the recess forming one side of the mold cavity 6 and the mold alignment of the second cavity block 3 is performed.
  • the protrusion 12 protrudes from the surface and has an outer peripheral shape similar to the outer peripheral shape of the recess.
  • the shape of the protrusion at that time will be represented by volume and depth, not volume and height (the same applies hereinafter).
  • the outer peripheral ends of the mold cavities 6a to 6h face the mold cavity surface of the second cavity block 3.
  • the height of the projection 12h is zero in this embodiment. That is, the surface of the multilayer molded article molded by the mold cavity 6h is flat.
  • the mold cavities 6a to 6h thus formed are arranged at equal intervals on the circumference, as shown in FIG. Then, the volumes of the mold cavities 6a to 6h gradually increase from the mold cavity 6a to the mold cavity 6h.
  • the mold cavities may be arranged not on the circumference but on a straight line.
  • an intermediate molded product as a first layer is formed in the mold cavity 6a in which the volume of the protrusion 12a is the largest and the volume of the mold cavity is the smallest.
  • the intermediate molded product is transferred from the mold cavity 6a to the juxtaposed mold cavity 6b having a larger volume of the mold cavity by means such as rotating the first template 4 at the time of mold opening.
  • a substantial mold cavity 6b is formed by the surface on the second cavity block side of the intermediate molded article of the first layer, and the second layer is formed.
  • the intermediate molded articles formed of the first to seventh layers corresponding to the mold cavity 6a to the mold cavity 6g are sequentially transferred to the mold cavity having a larger mold cavity volume. As shown in FIG.
  • Articles 15 and 16 are completed. Thereafter, the multilayer molded articles 15, 16 are released from the mold cavity 6h and taken out.
  • the convex lens was illustrated as multilayer molded articles 15 and 16, a multilayer molded article may be a light-guide plate etc. which are optical products, and may be non-optical products.
  • the surface 19 as the Nth layer of the multilayer molded article 16 is formed by transfer molding by the projecting portion 12 in the case of assuming that the concave portion is deeper than the concave portion depth of the first cavity block 2 in the mold of FIG. Ru.
  • the transfer state of the surface 19 is an important factor that influences the characteristics of the multilayer molded product 16 when it is an optical product. A good transfer state is exhibited when the surface shape of the protrusion 12 is faithfully transferred, but in order to do so, it is necessary to reduce the cooling effect at the time of forming the Nth layer. Therefore, the temperature of the projecting portion 12 for forming the Nth layer is set to be higher than the temperature of the projecting portions of the other layers.
  • the difference between the maximum height or the maximum depth of the projection 12 (recess) for layer formation is configured to be smaller than the same difference between any layers in the younger layer order.
  • the gates 7a to 7g are provided at the end of the counter electrode with the communicating portions of the resin passages 11a to 11g which project and communicate with the outer peripheries of the mold cavities 6a to 6g.
  • the runners 7 formed in the second cavity block 3 and the second template 5 are connected to the gates 7, 7a to 7g.
  • Each runner 8 can be cut from the gates 7, 7a to 7g when the intermediate molded product is released from the second cavity block 3.
  • the runner 9 is provided in the second template 5 so as to communicate with the runner 8.
  • the runner 9 is preferably a hot runner or a cold runner, but may be configured to take out the runner 9 together with the runner 8 from the gap formed by dividing the second template 5 at the portion of the runner 9.
  • the sprue 10 is provided in the second template 5 so as to communicate with the runner 9 and a nozzle of an injection device (not shown) abuts on the open end of the sprue 10 so that molten resin is injected and injected.
  • the gates 7a to 7g are preferably pin gates in terms of minimizing gate marks and facilitating separation from the intermediate molded product. In addition, the configuration in which the gates 7a to 7g are hot tips of a hot runner is effective in that the separation of the intermediate molded product is further facilitated.
  • the gates 7a to 7g are provided at positions where the mold cavity surface of the Nth layer is to be formed, but instead, the resin passages 11a to 11g are extended outward to form the outer end face of the multilayer molded product You may comprise so that it may provide.
  • the gates of the first to (N-1) -th layers are provided on one surface of the outer peripheral end face of the multilayer molded article having two layers, and the outer peripheral end face of the multilayer molded article has become two layers.
  • the gate of the Nth layer is provided on the other side.
  • the resin passages 11a to 11g are connected to the outer peripheral end portions of the respective projecting portions 12a to 12g (recesses) on the mold mating surface of the second cavity block 3 with the first cavity block 2. It forms at the time of shaping
  • the resin passages 11a to 11g have a cross-sectional area sufficient to reduce the stress due to the injection pressure remaining in the vicinity of the inlet of the molten resin to each mold cavity 6a to 6g, thereby improving the optical characteristics of the multilayer molded article Have the effect of Further, the gate balance can be adjusted by changing the cross-sectional area of each of the resin passages 11a to 11g for each of the mold cavities 6a to 6g.
  • the gate 7i is a first modification of the gates 7a to 7g.
  • the gate 7i is provided directly on the portion of each of the mold cavities 6a to 6g facing the second cavity block 3. That is, the gate 7i is provided on the surface of the mold cavity 6h for forming the eighth layer (N-th layer), and the gate mark is a second generation and is an interface in forming the eighth layer as the N-th layer. Is melted, so that minute irregularities and residual stress disappear, and a multilayer molded article 15 with excellent optical characteristics can be manufactured.
  • the gate 7i is preferably a pin gate. Since this configuration does not require a resin passage, it is extremely simple, and the multilayer molding die device can be easily configured.
  • the gate 7 h is provided at a position corresponding to the outer peripheral end face of the multilayer molded article 15 molded by the mold cavity 6 h of the eighth layer (Nth layer).
  • the gate 7 h is preferably a side gate having a relatively large cross-sectional area in order to reduce the residual stress remaining on the outer peripheral end face of the multilayer molded article.
  • a gate mark 14 formed by cutting and separating the runner at the gate 7h portion appears on the outer peripheral end face of the multilayer molded article 15, as shown in FIG. 7, a gate mark 14 formed by cutting and separating the runner at the gate 7h portion appears.
  • the molded article 15 molded by the mold apparatus whose configuration is shown in FIG.
  • the mold apparatus shown in FIG. 4 is configured so that the A layer 20 is not formed by the molding of the first layer, and the outer peripheral end of the molded article 15 is formed by the molding of the eighth layer (N layer). It may consist only of
  • the mold cavity 6h for the eighth layer (Nth layer) is the intermediate molded product as the first to seventh layers, the resin passages 11a to 11g, and the gates 7a to 7 described above. 7g (gate 7i) is substantially on one side.
  • the molding of the eighth layer (Nth layer) into the mold cavity 6h covers the intermediate molded products as the first to seventh layers, the resin passages 11a to 11g, and the gates 7a to 7g (gate 7i). This is the final process to be performed with a multilayer molded article. Therefore, the marks of the gates 7a to 7g do not appear on the outer surface of the multilayer molded article, and as shown in FIG. 7, only the gate marks 14 which are marks of the gate 7h remain on the outer peripheral end face.
  • the molded product 15 molded by the mold apparatus having the configuration shown in FIG. 3 is a molded portion of the first layer and a molded portion of the A layer 20 where the gate mark is not exposed and the eighth layer (Nth layer) It has an outer peripheral end composed of two layers with the B layer 21 where the gate mark 14 is exposed.
  • the gate 7 h is provided not at a position corresponding to the outer peripheral end face of the multilayer molded article 15 but at a position corresponding to the outer peripheral end portion formed by molding the eighth layer (Nth layer) or in the vicinity thereof. You may do so.
  • the mold apparatus shown in FIG. 3 is configured so that the A layer 20 is not formed by molding the first layer, and the outer peripheral end of the molded article 15 is formed by molding the eighth layer (N layer). It may consist only of
  • the flowing molten resin is the first As the intermediate molded product as the layers to the seventh layer, the resin passages 11a to 11g, and the gates 7a to 7g (gate 7i) are melted at their interfaces with each other, minute irregularities and residual stress are eliminated. And multilayer molded articles having excellent optical properties.
  • the gates 7a to 7g (gate 7i) can be set at any position corresponding to the optical surface which is the surface forming the mold cavity 6h for forming the eighth layer (Nth layer), multi-layer molding The freedom of product design is increased.
  • FIG. 5 shows the molding state of the third layer in the mold apparatus of FIG.
  • the gate 7j is located at the tip of the runner 8 formed by forming a hole in the protrusion 12 for forming each of the first to (N-1) th layers.
  • the surface facing the second cavity block 3 of the intermediate molded product formed by the projecting portion 12 is a mold cavity surface for forming a fourth layer as a later generation. Therefore, the gate 7j is provided on the mold cavity surface for subsequent layer forming of each layer.
  • the gate 7j can be provided in one or more optional mold cavities.
  • the molded product 15 molded by the mold apparatus whose configuration is shown in FIG. 5 is the molded portion of the first layer and the A layer 20 where the gate mark is not exposed, and the eighth layer (N Layer B, and has an outer peripheral end composed of two layers with the B layer 21 where the gate mark 14 is exposed.
  • the gate for molding the eighth layer (Nth layer) is a position corresponding to the outer peripheral end face of the multilayer molded article 15 or an outer peripheral end formed by molding the eighth layer (Nth layer) Or it can provide in the position corresponded in the vicinity.
  • the mold apparatus shown in FIG. 5 is configured so that the A layer 20 is not formed by molding the first layer, and the outer peripheral end of the molded article 15 is formed by molding the eighth layer (N layer). It may consist only of
  • FIG. 6 shows a third modification of the gates 7a to 7g.
  • FIG. 6 shows a molding state of the seventh layer ((N-1) layer) in the mold apparatus of FIG.
  • the gate 7k is provided on the mold cavity surface for forming the seventh layer corresponding to the formation of each layer from the first layer to the sixth layer.
  • the gate 7l is located at the tip of the runner 8 formed by drilling in the second cavity block 3 for forming the seventh layer, and is provided on the mold cavity surface for forming the eighth layer (Nth layer).
  • the gate mark of the gate 7k generated in each of the first to sixth layers melts the interface in the subsequent formation of the seventh layer, so that the minute unevenness and residual stress disappear, and the optical characteristics Excellent multilayer molded articles can be produced.
  • the multilayer molded product molded by the mold apparatus having the configuration shown in FIG. 6 has a molded portion in the first layer as the A layer, and a molded portion in the seventh layer as the C layer, and an eighth layer (Nth layer not shown) And the outer peripheral edge consisting of three layers in which the molded portion in FIG. At this time, the gate for molding the eighth layer should be provided at a position corresponding to the outer peripheral end face of the multilayer molded product or at a position corresponding to the outer peripheral end portion formed by molding the eighth layer (Nth layer) or in the vicinity thereof.
  • the mold apparatus shown in FIG. 6 is configured so that the outer peripheral end of the multilayer molded article is not formed by molding the first layer and the seventh layer, and the outer peripheral end of the multilayer molded article is the eighth layer (Nth layer It may consist of only one layer formed by molding of 2.).
  • the depth dimension of the concave portion which forms one side of each mold cavity 6 and has the same shape and the same size as each other among the respective projecting portions 12 is all If it is larger than the maximum height dimension of.
  • the depth dimension of the concave portion which forms one side of each mold cavity 6 and has the same shape and the same dimensions as all is the maximum depth of the respective concave portions when the projecting portion 12 is concave. It can also be configured smaller than the dimensions. With this configuration, it is possible to reduce the processing cost of the recess. In particular, when the molded product is an optical lens, it is necessary to make the concave portion a non-spherical mirror surface, and the processing cost is high.
  • a multilayer molded article 16 shown in FIG. 8 is an optical lens molded by the multilayer molding die apparatus having such a configuration.
  • the multilayer molded product 16 has a small curvature aspheric or planar surface 18 formed by transfer molding with one of the recesses of the same shape in the mold cavity, and the recess when the protrusion 12 is concaved.
  • the surface of the aspheric surface 19 has a curvature larger than the curvature of the surface 18 and is formed by the recess having the largest depth.
  • the surface 18 is the first layer of the multilayer molded article, and the surface 19 is the Nth layer of the multilayer molded article.
  • the molded article 16 has an outer peripheral end portion consisting of two layers in which the molded portion in the first layer is the A layer 20 and the molded portion in the eighth layer (Nth layer) which is the final layer is the B layer 21. Have.
  • the multilayer molding die apparatus having the configuration described in the preceding paragraph, it is possible to easily and inexpensively form both surfaces of different curvatures of the optical lens.
  • FIG. 9 Shown in FIG. 9 is a multilayer molded article 17 as another example of the multilayer molded article 16 shown in FIG. 8 and also includes a fourth modified embodiment of the gate.
  • the multilayer molded article 17 is molded by a mold apparatus different from the mold apparatus shown in FIG. 3 in the following point. That is, the gates 7a to 7g for supplying the molten resin to the mold cavities from the first layer to the seventh layer in FIG. 3 are provided at the end of the resin passages 11a to 11g toward the mold cavities of the eighth layer. It is done.
  • the gate is provided at a portion of the resin passage 28 to 31 extended to the outer peripheral end face of the multilayer molded article 17.
  • the order of lamination of the molding layers is that in the mold apparatus shown in FIG. 3 the layers are laminated in the order of convex surface to planar surface, while in the mold apparatus of the multilayer molded article 17 they are laminated in order of planar surface to convex surface.
  • the multilayer molded article 17 molded in this manner has the gate mark 22 of the gate formed by molding the A layer 20 as the first layer without the resin passage on one of the outer peripheral end faces formed into two layers, A gate mark 23 of the gate formed by molding the second layer 32 through the resin passage 28 and a gate mark 24 of the gate formed by molding the third layer 33 through the resin passage 29 on the other of the two outer peripheral end faces.
  • a gate mark 25 of the gate formed by molding the fourth layer 34 through the resin passage 30, a gate mark 26 of the gate formed by molding the fifth layer 35 through the resin passage 31, a sixth layer 36 and a seventh layer 37 has a gate mark (not shown) and a gate mark 27 of a gate formed by molding an eighth layer 38 (B layer 21) having no resin passage.
  • Each mold cavity is provided with a resin passage communicating radially from the outer periphery to the gate so as to be formed on the surface of the A layer 20 (first layer).
  • the mold cavity may be configured to partially cover a portion of the previous layer.
  • the resin passage will be provided on the surface of the intermediate molded product in a plurality of layers.
  • the gate is preferably a side gate less affected by heat generation at the gate portion.
  • the ridge portion as the outer peripheral end portion is formed from the first layer molded portion and the Nth layer molded portion as the intermediate molded product. Or a layer consisting of the N-th layer molding portion.
  • the main part which is a part except the heel part in a multilayer molded article is N layer.
  • a ridge having a thickness corresponding to the thickness of the N layer was required. Therefore, since the outer peripheral end of the multilayer molded article of the present invention is one layer or two layers even if N is three or more, the excellent effect of the present invention is exhibited when N is three or more. .
  • the gate is provided at a position where the gate mark of the gate does not appear on the outer surface of the multilayer molded article 15, so that the installable area of the gate becomes relatively wide.
  • the metal mold can be easily designed, and the gate can be provided at a position and a state optimum for the formation of each layer, and the excellent effect that the degree of freedom of molded product design is improved and the design becomes easy.
  • the gate mark of each gate from the first layer to the (N-1) layer is covered by the later layer forming and the forming of the N layer, each of the first layer to the (N-1) layer is covered
  • the gate marks and the interface of the intermediate molded product are melted, and the minute unevenness and residual stress disappear. Therefore, in the case where the multilayer molded product is an optical product such as a lens or the like, an excellent effect of being able to manufacture a multilayer molded product with excellent optical characteristics is exhibited.
  • the gate mark 14 of the gate having the Nth layer molded appears only at the outer peripheral end or in the vicinity thereof. Since the mark of the gate formed by molding the layer does not appear, there is an excellent effect that the optical properties of the multilayer molded article are remarkably improved despite the provision of the gate of the intermediate molded article on the optical surface.
  • the present invention can also be applied to various combinations of the above-described gate modifications.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention porte sur un dispositif de moule pour moulage multicouche qui peut faciliter la conception du moule et qui, lorsqu'une lentille est moulée, peut améliorer les caractéristiques optiques de cette lentille, ainsi que aussi sur un article moulé multicouche. Lorsqu'un article moulé multicouche (15) ayant N couches est moulé par transfert et injection successifs de chacun des articles moulés intermédiaires obtenus par injection d'une résine fondue dans N empreintes de moule (6) qui sont formées par l'appariement des moules entre tous les premiers blocs d'empreintes (2) et tous les seconds blocs d'empreintes (3) et qui ont des capacités différentes les unes des autres, dans une empreinte de moule (6) ayant une plus grande capacité, des attaques (7a-7g) formées dans des états d'appariement de moules respectifs à partir de l'état d'appariement de moules d'une première couche à l'état d'appariement de moules d'une (N-1)ième couche sont disposées dans des positions dans lesquelles les traces d'attaque des attaques n'apparaissent pas sur la surface extérieure de l'article moulé multicouche (15), et une attaque servant à acheminer la résine fondue à une empreinte de moule dans l'état d'appariement des moules pour mouler une Nième couche dans lequel la capacité de l'empreinte de moule est maximale, est placée dans une position qui correspond à la surface extérieure de l'article moulé multicouche.
PCT/JP2012/053511 2011-03-31 2012-02-15 Dispositif de moule pour moulage multicouche et article moulé multicouche WO2012132597A1 (fr)

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JP2016055642A (ja) * 2014-09-11 2016-04-21 東芝機械株式会社 光拡散用レンズの製造装置および製造方法
WO2016096096A1 (fr) * 2014-12-16 2016-06-23 Gebr. Krallmann Gmbh Procédé de fabrication d'une lentille multicouche en matière plastique
EP2971944A4 (fr) * 2013-03-15 2016-11-16 Cree Inc Élément optique monobloc à lentilles multiples et méthode de fabrication
CN106660244A (zh) * 2014-07-28 2017-05-10 奥林巴斯株式会社 复合光学元件的制造装置和复合光学元件的制造方法
US10119662B2 (en) 2009-04-28 2018-11-06 Cree, Inc. Lens with controlled light refraction
US10207440B2 (en) 2014-10-07 2019-02-19 Cree, Inc. Apparatus and method for formation of multi-region articles
JP2019130834A (ja) * 2018-01-31 2019-08-08 住友重機械工業株式会社 射出成形方法および金型装置
JP2021132896A (ja) * 2020-02-27 2021-09-13 株式会社Lixil トイレ装置のカバー材

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KR102313013B1 (ko) * 2021-02-04 2021-10-14 한상용 사출 금형 장치 및 그것을 이용한 사출 제품의 제조방법과 그 제조방법을 이용하여 제조된 사출 제품

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WO2016096096A1 (fr) * 2014-12-16 2016-06-23 Gebr. Krallmann Gmbh Procédé de fabrication d'une lentille multicouche en matière plastique
CN107206713B (zh) * 2014-12-16 2019-12-10 格布尔.克拉尔曼有限责任公司 制造多层塑料透镜的方法
JP2019130834A (ja) * 2018-01-31 2019-08-08 住友重機械工業株式会社 射出成形方法および金型装置
JP2021132896A (ja) * 2020-02-27 2021-09-13 株式会社Lixil トイレ装置のカバー材
JP7411444B2 (ja) 2020-02-27 2024-01-11 株式会社Lixil トイレ装置のカバー材

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