JP2006232314A - Manufacturing method for decorative plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a decorative plate in which jetting is hard to occur at the time of injection molding, and by which the decorative plate being excellent in appearance can be obtained. <P>SOLUTION: This manufacturing method is used for manufacturing the decorative plate 5 by dividing the decorative plate 5 in the thickness direction into a first layer 5A and a second layer 5B by double molding. The first layer 5A is equipped with a first gate protruding section 55A which protrudes in the thickness direction toward the second layer 5B on the peripheral edge. The second layer 5B is equipped with a second gate protruding section 55B which protrudes in the thickness direction toward the first layer 5A on the peripheral edge. A primary mold which molds the first layer 5A and a secondary mold N2 which laminate-molds the second layer 5B on the first layer 5A are used. The primary molding gate G1 of the primary mold is arranged at the first gate protruding section 55A of the first layer 5A, and the first layer 5A is molded by injecting a synthetic resin to a position corresponding to the central section of the second layer 5B from the primary molding gate G1. After the first layer 5A has been molded, the secondary molding gate G2 of the secondary mold N2 is arranged at the second gate protruding section 55B of the second layer 5B, and the second layer 5B is laminate-molded on the first layer 5A by injecting a synthetic resin toward a position corresponding to the central section of the first layer 5A from the secondary molding gate G2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a decorative plate manufacturing method for manufacturing a decorative plate made of synthetic resin by injection molding, a decorative plate manufactured by the manufacturing method, and a decorative plate-equipped container provided with the decorative plate.

  2. Description of the Related Art Conventionally, a container body and a cap on which a mouth of the container body is fitted are provided, and a decorative plate (a plate-like member for decoration such as design improvement and display) is provided on a plate fitting portion provided on the top surface of the cap. ) Are manufactured and sold (for example, see Patent Document 1 below).

An example of the decorative plate in such a container with a decorative plate is a decorative convex lens. The decorative convex lens is generally formed by injection molding of a transparent resin. In the injection mold, when considering mold division, the gate is arranged at a position corresponding to the peripheral edge of the decorative convex lens, and the molten resin is directed from the gate to the position corresponding to the central part of the decorative convex lens. It is preferable to perform injection (this direction is hereinafter referred to as a “plane direction”).
In particular, in a decorative convex lens, in order to improve the design, a metal foil may be provided on the back surface by a hot stamp method, in which case, in order to increase the area of the metal foil on the back surface of the decorative convex lens. In addition, it is preferable that the back surface of the decorative convex lens has no burrs at the time of molding. Also from this point, the injection direction of the molten resin is preferably the surface direction.

JP 2000-255618 A

  However, according to the conventional manufacturing method in which the molten resin is injected in the plane direction, the molten resin injected from the gate is easily diffused in the cavity and becomes a meandering flow. As a result, so-called jetting easily occurs, and a meandering pattern tends to remain on the molded decorative plate. This jetting becomes particularly remarkable when injection molding is performed using a transparent resin having a high viscosity and when a thick decorative plate is injection molded, as in the case of manufacturing a convex lens for decoration.

  Accordingly, an object of the present invention is to provide a method for manufacturing a decorative plate that is less likely to cause jetting during injection molding of the decorative plate and obtain a decorative plate with an excellent appearance, a decorative plate manufactured by the manufacturing method, and the decorative plate. The object is to provide a container with a decorative plate.

  The present invention is a method for manufacturing a decorative plate, wherein a decorative plate made of a synthetic resin is manufactured by double molding by dividing the decorative plate into a first layer and a second layer in the thickness direction. A first gate protrusion protruding in the thickness direction toward the second layer at the periphery, and the second gate protrusion protruding in the thickness direction toward the first layer at the periphery of the second layer A primary molding die that molds the first layer and a secondary molding die that laminates the second layer on the first layer, and the primary molding gate of the primary molding die is the first layer. The first synthetic resin is disposed in the first gate protrusion, and the molten synthetic resin is injected from the primary molding gate toward a position corresponding to the central portion of the second layer to mold the first layer, After the first layer is molded, the secondary molding gate of the secondary molding die is connected to the second gate of the second layer. The molten synthetic resin is injected from the secondary molding gate toward the position corresponding to the central portion of the first layer, and the second layer is laminated on the first layer. The object has been achieved by providing a method for producing a decorative plate to be molded.

Moreover, this invention achieved the said objective by providing the decorative plate manufactured by the manufacturing method of the said decorative plate.
In addition, the present invention provides a container with a decorative plate, which includes a container body and a cap on which the mouth portion is fitted, and the decorative plate is fitted to a plate fitting portion provided on the top surface of the cap. By doing so, the above object was achieved.

According to the method for manufacturing a decorative plate of the present invention, it is difficult to cause jetting, and a decorative plate having an excellent appearance can be obtained. It is particularly suitable for producing a transparent and thick decorative plate.
In addition, the decorative plate and the container with the decorative plate of the present invention do not have a meandering pattern due to jetting on the decorative plate, and have an excellent appearance.

Hereinafter, the manufacturing method of the decoration plate of this invention, the decoration plate, and the container with a decoration plate are demonstrated.
A container 1 with a decorative plate according to a first embodiment, which is a preferred embodiment of the present invention, comprises a cap 3 on which a container body 2 and its mouth 21 are fitted, as shown in FIGS. A circular decorative plate 5 is fitted to a plate fitting portion 4 provided on the top surface 31 of the cap 3.

  As shown in FIGS. 1 to 3, the plate fitting portion 4 of the decorative plate-equipped container 1 of the present embodiment includes a plate arrangement surface 41 on which the decoration plate 5 is arranged, and a peripheral portion of the plate arrangement surface 41. Is provided with an annular standing portion 42 erected along.

As shown in FIG. 2, the container main body 2 includes a mouth portion 21 that is a liquid discharge port at an upper portion of a cylindrical housing portion 23 that accommodates a liquid, and a lower portion of the housing portion 23 is a bottom surface 22. . The container body 2 is made of polyethylene terephthalate (PET), a copolymer of polyethylene terephthalate and cyclohexanedimethanol (for example, PETG6763 of Eastman Chemical Co., or PCTG of the same company), a copolymer of polycyclohexylenedimethylene terephthalate and isophthalic acid. It consists of a synthetic resin such as a polymer (PCTA), an acrylonitrile / butadiene / styrene copolymer (ABS), preferably a transparent resin. The mouth portion 21 of the container body 2 is formed by, for example, injection molding or injection blow molding, and the accommodating portion 23 and the bottom surface 22 of the container body 2 are formed by, for example, blow molding, injection blow molding, or stretch blow molding. The container body 2 can also be formed from glass or the like.
Examples of the liquid stored in the container body 2 include a cosmetic liquid, an emulsion, a cream, a shampoo, and a treatment.

  A male screw portion 21 </ b> A that engages with a female screw portion 34 </ b> A (described later) provided on the inner peripheral surface of the inner annular hanging portion 34 of the cap 3 is provided on the peripheral portion of the mouth portion 21. A separate liquid injection stopper 21 </ b> B is fitted to the top of the mouth 21.

  As shown in FIGS. 1 to 3, the cap 3 is a so-called screw cap, for example, a synthetic resin injection-molded product. The cap 3 has a substantially circular top plate 32, a cylindrical outer ring hanging portion 33 depending from the peripheral edge of the top plate 32, and a cylindrical shape concentrically hanging from the top plate 32 inside the outer ring hanging portion 33. The inner ring hanging part 34 is provided.

As shown in FIGS. 2 and 3, a plate fitting portion 4 to which a circular decorative plate 5 can be fitted is provided on the top surface 31 of the top plate 32.
The plate fitting portion 4 includes a plate placement surface 41 on which the decorative plate 5 is placed, and an annular standing portion 42 that is erected along the peripheral edge of the plate placement surface 41.

The plate arrangement surface 41 is a surface on which the decoration plate 5 is arranged, and the size and shape of the plate arrangement surface 41 are matched with the size and shape of the decoration plate 5.
The plate arrangement surface 41 is parallel to the bottom surface 22 of the container body 2 in a state where the mouth portion 21 of the container body 2 is fitted by the cap 3.

  As shown in FIG. 3, the annular standing portion 42 is erected from the plate placement surface 41 along the peripheral edge of the plate placement surface 41, and is formed between the decorative plate 5 and the plate fitting portion 4. It is provided to stabilize the fitted state. The annular standing portion 42 is erected along a direction Z orthogonal to the bottom surface 22 of the container body 2. The height of the annular standing portion 42 is matched with the height of the peripheral edge portion 51 of the decorative plate 5.

  As shown in FIGS. 1 to 3, the outer ring hanging portion 33 has a cylindrical shape, and the outer peripheral surface thereof is substantially flush with the outer peripheral surface of the accommodating portion 23 of the container body 2, so that the design of the entire container can be improved. It is provided for improvement, ease of twisting of the cap 3, and the like.

  As shown in FIG. 3, the inner ring-suspended lower portion 34 has a cylindrical shape and includes an internal thread portion 34 </ b> A on the inner peripheral surface thereof. The cap 3 can be attached to the mouth portion 21 of the container main body 2 by screwing the female screw portion 34 </ b> A and the male screw portion 21 </ b> A of the mouth portion 21 of the container main body 2. That is, the cap 3 is a so-called screw cap.

The decorative plate 5 shown in FIGS. 2 and 3 is a plate-like member for decoration such as improvement in design and display, and is a convex lens for decoration in this embodiment. The decorative convex lens 5 gives depth and improves the design of the cap 3 by, for example, applying decoration such as providing a metal foil, characters, or the like on the back surface thereof. The decorative convex lens 5 has a surface 52 protruding in a smooth curved shape from the peripheral edge 51 toward the center, and a back surface 53 having a flat shape. As shown in FIG. 3, the peripheral edge 51 of the decorative plate 5 extends along the direction Z orthogonal to the bottom surface 22 of the container body 2 over the entire circumference.
The size and thickness of the decorative convex lens are appropriately set in consideration of design and the like. For example, the size is 10 to 50 mm in diameter, and the thickness is 2 to 15 mm.

The decorative plate 5 can be formed from synthetic resin, glass, or the like. The decorative convex lens is preferably formed from a transparent material.
Preferred synthetic resins include, for example, a copolymer of polyethylene terephthalate and cyclohexanedimethanol (for example, PETG6763 of Eastman Chemical Co., or PCTG of the company), a copolymer of polycyclohexylenedimethylene terephthalate and isophthalic acid ( PCTA) and acrylonitrile / butadiene / styrene copolymer (ABS).

Although a decorative plate can be formed using acrylonitrile styrene copolymer (AS), AS has good fluidity and is difficult to cause jetting. Therefore, the significance of applying the production method of the present invention is not significant. Few.
In the decorative plate 5 in the present embodiment, a metal foil (not shown) is provided on the entire back surface 53 by a hot stamp method.

In the decorative plate-equipped container 1 of the present embodiment, as shown in FIG. 3B, the peripheral edge 51 of the decorative plate 5 is close to the inner peripheral surface 42 </ b> A of the annular standing portion 42 over the entire circumference. And is fitted to the plate fitting portion 4.
In the container 1 with a decorative plate of the present embodiment, the decorative plate 5 is joined to the plate arrangement surface 41 of the plate fitting portion 4 of the cap 3 with an adhesive (not shown).

Next, a method for manufacturing the decorative plate of the embodiment will be described with reference to the drawings.
As shown in FIG. 4, the manufacturing method of the decorative plate 5 according to the present embodiment is obtained by dividing the decorative plate 5 made of synthetic resin into a first layer 5A and a second layer 5B in the thickness direction by double molding. It is a manufacturing method of the decorative plate to manufacture. The first layer 5A includes a first gate protrusion 55A in which a part of the periphery protrudes in the thickness direction toward the second layer 5B, and the second layer 5B has a part of the periphery of the first layer 5A. A second gate protrusion 55B protruding in the thickness direction is provided.

In the manufacturing method of the decorative plate 5 of the present embodiment, as shown in FIGS. 5 and 6, the primary molding die N1 for molding the first layer 5A and the secondary molding for laminating the second layer 5B on the first layer 5A. Use type N2.
5 shows a state in which the primary molding cavity C1 in the primary molding die N1 is filled with synthetic resin and the first layer 5A is molded, and FIG. 6 shows the secondary molding in the secondary molding die N2. A state in which the synthetic resin is filled in the cavity C2 and the second layer 5B is molded is shown.

  And in the manufacturing method of this embodiment, as shown in FIG. 5, the gate G1 of the primary mold N1 is disposed on the first gate protrusion 55A of the first layer 5A and melted from the gate G1. Synthetic resin is injected toward the position corresponding to the center of the second layer 5B to form the first layer 5A, and after the first layer 5A is formed as shown in FIG. The gate G2 of N2 is disposed on the second gate protrusion 55B of the second layer 5B, and the molten synthetic resin is injected from the gate G2 toward a position corresponding to the center of the first layer 5A, The second layer 5B is laminated and formed on the first layer 5A.

  The decorative plate 5 manufactured by the manufacturing method of this embodiment will be further described with reference to FIG. The decorative plate 5 is a laminated body that is manufactured by double molding by dividing it into a first layer 5A as an upper layer and a second layer 5B as a lower layer. In the present embodiment, the first layer 5A and the second layer 5B of the decorative plate 5 are made of the same material.

The first layer 5A includes a first gate protrusion 55A that protrudes in the thickness direction toward the second layer 5B on the periphery thereof. Further, the second layer 5B includes a second gate protrusion 55B protruding in the thickness direction toward the first layer 5A on the periphery thereof.
The decorative plate 5 has a substantially circular shape in plan view, and the first gate protrusion 55A of the first layer 5A and the second gate protrusion 55B of the second layer 5B are point-symmetric with respect to the center of the decorative plate 5. Is arranged.
The lower end of the first gate protrusion 55 </ b> A of the first layer 5 </ b> A is located on the back surface 53 of the decorative plate 5. The upper end of the second gate protrusion 55B of the second layer 5B is located on the surface 52 of the decorative plate 5.

The first gate protrusion 55A and the second gate protrusion 55B have a width along the circumferential direction of the decorative plate 5 that is preferably 5% to 45% of the entire circumference of the decorative plate 5.
The boundary between the first layer 5A and the second layer 5B is the back surface 53 except that the first gate protrusion 55A protrudes toward the second layer 5B and the second gate protrusion 55B protrudes toward the first layer 5A. It is in the shape of a parallel plane.

The manufacturing method of the decorative plate 5 of this embodiment will be described in further detail with reference to FIGS. In this manufacturing method, a so-called rotary double molding die is used.
First, a primary molding die and a secondary molding die for double molding used in the manufacturing method will be described.

As shown in FIG. 5, the primary mold N1 is for molding the first layer 5A. The primary mold N1 is a first mold M1 that forms the surface 52 side of the first layer 5A, and the back surface 53 side (the first layer 5A). And the second type M2 forming the second layer 5B side). Here, the first mold M1 is an upper mold and the second mold M2 is a lower mold.
The first mold M1 moves in the vertical direction and is configured to approach or separate from the second mold M2. The second mold M2 is provided on a turntable (not shown).

  In the primary mold N1, a primary mold cavity C1 corresponding to the shape of the first layer 5A is formed from the first mold M1 and the second mold M2. In the primary mold N1, the primary molding gate G1 is disposed at a position where the first gate protrusion 55A of the first layer 5A is formed. From the primary molding gate G1, the molten synthetic resin can be injected toward a position corresponding to the central portion of the second layer 5B.

As shown in FIG. 6, the secondary mold N2 is for molding the second layer 5B, and includes the first mold M1 and the third mold M3 that forms the back surface 53 side of the second layer 5B. Here, the first mold M1 is an upper mold, and the third mold M3 is a lower mold.
The third mold M3 is disposed on the turntable provided with the second mold M2 at a point-symmetrical position with respect to the rotation center of the second mold M2.

In the secondary mold N2, a secondary molding cavity C2 corresponding to the shape of the second layer 5B is formed from the first layer 5A molded in the first mold M1 and the third mold M3. In the secondary mold N2, the secondary molding gate G2 is arranged at a position where the second gate protrusion 55B of the second layer 5B is formed. From the secondary molding gate G2, the molten synthetic resin is injected toward a position corresponding to the central portion of the first layer 5A, and the second layer 5B can be laminated and formed on the first layer 5A.
In the double-molding mold, a configuration of a normal rotary double-molding mold is employed for a configuration that is not particularly described.

According to the method for manufacturing a decorative plate of this embodiment, the decorative plate 5 of the above embodiment can be manufactured as described below by using the mold for double molding.
First, as shown in FIG. 5, in the primary mold N1, the first mold M1 and the second mold M2 are brought into contact with each other to form the primary mold cavity C1.

  Next, in this state, the synthetic resin melted from the primary molding gate G1 is injected toward a position corresponding to the center portion of the second layer 5B. Here, when the synthetic resin injected from the primary molding gate G1 flows through a distance corresponding to the thickness of the first gate protrusion 55A, the wall surface disposed on the inner surface side of the first gate protrusion 55A in the second mold M2. Collide and diffuse into the primary molding cavity C1. Therefore, the first layer 5 </ b> A is obtained that is less likely to cause jetting and has an excellent appearance without a meandering pattern due to jetting.

  Next, after the predetermined time has elapsed and the first layer 5A is cured, the first mold M1 is moved upward with the first layer 5A attached. In this state, the turntable is rotated to place the third mold M3 below the first mold M1. Then, the first mold M1 is lowered until it comes into contact with the third mold M3. As a result, as shown in FIG. 6, a secondary molding cavity C2 in the secondary molding die N2 is formed.

  Subsequently, under this state, the synthetic resin melted from the secondary molding gate G2 is injected toward a position corresponding to the central portion of the first layer 5A. Here, when the synthetic resin injected from the secondary molding gate G2 flows through a distance corresponding to the thickness of the second gate protrusion 55B, the synthetic resin is disposed on the inner surface side of the second gate protrusion 55B in the first layer 5A. Collides with the part and diffuses into the secondary molding cavity C2. Therefore, the second layer 5B, which is less likely to cause jetting and has an excellent appearance without a meandering pattern due to jetting, is laminated and formed on the first layer 5A. As a result, the decorative plate 5 having an excellent appearance can be obtained.

The above-described effect of the decorative plate manufacturing method of the present embodiment is particularly prominent when a decorative plate is manufactured using a transparent resin having a high viscosity and when a thick decorative plate is manufactured.
Further, in the decorative plate 5 manufactured in this way, burrs at the time of molding may occur at the peripheral edge 51 but do not occur at the back surface 53. Therefore, the metal foil can be easily attached to the entire back surface 53 by the hot stamp method.

  Next, another embodiment of the container with a decorative plate of the present invention will be described. About the container with a decoration plate of another embodiment, a different point from the container with a decoration plate of 1st Embodiment is mainly demonstrated, the same code | symbol is attached | subjected about the same structure, and description is abbreviate | omitted. For points that are not particularly described, the description of the container with a decorative plate of the first embodiment is applied as appropriate.

As shown in FIG. 7, the decorative plate-equipped container 1 of the second embodiment is mainly different in shape of the decorative plate 5 from the decorative plate-equipped container of the first embodiment.
Specifically, the decorative plate 5 in the second embodiment has the surface 52 of the decorative plate 5 inclined as a whole as compared with the typical convex lens-shaped decorative plate 5 in the first embodiment. In other words, the decorative plate 5 has a shape that gradually increases as a whole. Here, “as a whole” means “when the surface of the decorative plate is viewed as being close to a plane”.

  As schematically shown in FIG. 7B, the decorative plate 5 having such a shape also has a first layer 5A including a first gate protrusion 55A, like the decorative plate 5 in the first embodiment, The second layer 5B provided with the second gate protrusion 55B can be divided and manufactured by double molding.

  If the decorative plate 5 having such a shape is employed, the surface 52 of the decorative plate 5 is inclined as a whole without the plate mounting surface 41 of the plate fitting portion 4 being inclined with respect to the bottom surface 22 of the container body 2. It can be set as the form. As a result, according to the container 1 with the decorative plate of the second embodiment, the same effect as the container 1 with the decorative plate of the first embodiment can be obtained, and the design of the entire container can be improved.

The manufacturing method of the decorative plate of the present invention is not limited to the above-described embodiment, and can be appropriately changed as shown below, for example, without departing from the spirit of the present invention.
In the above-described embodiment, the first mold M1 is moved up and down, and the second mold M2 and the third mold M3 are rotated to perform double molding. On the contrary, the first mold is moved up and down. It can be configured to rotate together (the positions of the second mold and the third mold do not move).
The method of the mold for double molding is not limited to the rotary type as in the above embodiment, and a known method in double molding can be adopted. For example, the so-called core back type (a method in which the slide core moves away from the first layer after primary molding to form a secondary molding cavity), or the in-mold type (separately molded first layer is a mold) The method of laminating and forming the second layer after being installed in the above can be adopted.

The injection direction of the molten synthetic resin in the primary molding gate G1 or the secondary molding gate G2 is a geometrically accurate direction toward the position corresponding to the center of the second layer 5B or the center of the first layer 5A. It is not limited to the direction toward the position corresponding to the part, and may be inclined from the direction within a range where jetting does not occur (for example, 10 degrees or less).
The mold division of the primary mold N1 and the secondary mold N2 is not limited to the mold division in the above-described embodiment.
The number of gates in the primary mold N1 and the secondary mold N2 is not limited to one and may be two or more.

The decorative plate of the present invention and the container with the decorative plate provided therewith are not limited to the above-described embodiments, and can be appropriately changed as shown below, for example, without departing from the spirit of the present invention.
In the decorative plate, the first layer may be a lower layer and the second layer may be an upper layer. The first layer and the second layer can be formed from different colors or different materials of the same color (so-called two-color molding).
The arrangement of the first gate protrusion of the first layer and the second gate protrusion of the second layer is not limited to a point-symmetric arrangement with respect to the center of the decorative plate. The number of first gate protrusions and second gate protrusions is not limited to one, and may be two or more.

The outer shape of the container body container and the cap is not limited to a circular shape in plan view, and may be an ellipse, a polygon such as a quadrangle, a hexagon, or an octagon.
The mouth part of the container body and the cap may be of a fitting type.
The shape of the decorative plate and the plate fitting portion is not limited to a circle, and may be an ellipse, or a polygon such as a quadrangle, a hexagon, or an octagon.
The decorative plate is not limited to a decorative convex lens, and may be, for example, a concave lens, a flat plate, or a patterned plate.
The joining of the plate fitting portion of the cap and the decorative plate is not limited to joining with an adhesive, and for example, joining with a double-sided tape may be used.

In the above-described embodiment, the metal foil is provided as a decorative thin film on the back surface of the decorative plate by the hot stamp method. As another metal foil, for example, a hologram foil is exemplified. Examples of the foil other than the metal foil include a pigment foil (printing foil).
The method of providing the foil on the back surface of the decorative plate is not limited to the hot stamp method, and for example, an in-mold transfer method may be used. As a method of providing a decorative thin film on the back surface of the decorative plate for the purpose of display or the like, in addition to the transfer of the foil, for example, label printing, direct printing such as pad printing, screen printing, and the like can be given.

FIG. 1 is a perspective view showing a first embodiment of a container with a decorative plate of the present invention. FIG. 2 is a perspective view showing a state in which the container main body, the cap, and the decorative plate are separated from the container with the decorative plate shown in FIG. FIG. 3A is a schematic longitudinal sectional view showing a decorative plate, and FIG. 3B is a schematic longitudinal sectional view showing a cap fitted with the decorative plate. 4A and 4B are schematic views showing the first layer and the second layer of the decorative plate, where FIG. 4A is a longitudinal sectional view, FIG. 4B is a right side view, and FIG. 4C is a left side view. FIG. 5 is a schematic view showing a primary mold used in an embodiment of the method for producing a decorative plate of the present invention, wherein (a) is a longitudinal sectional view, and (b) is a cutting line AB shown in (a). -C-D-E sectional drawing, (c) is sectional drawing which follows the cutting line FGGHDE shown to (a). FIG. 6 is a schematic view showing a secondary mold used in one embodiment of the method for producing a decorative plate of the present invention, wherein (a) is a longitudinal sectional view, and (b) is a cutting line A-- shown in (a). Sectional drawing which follows B-C-D-E, (c) is sectional drawing which follows the cutting line FGHDE shown to (a). FIG. 7A is a schematic longitudinal cross-sectional view (corresponding to FIG. 3B) showing a cap fitted with a decorative plate in the container with a decorative plate of the second embodiment, and FIG. It is a typical longitudinal cross-sectional view which shows the manufacturing method of the decoration plate in the container with a decoration plate of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container with decoration plate 2 Container main body 21 Mouth part 21A Male thread part 21B Injection liquid stopper 22 Bottom 23 Storage part 3 Cap 31 Top surface 32 Top plate 33 Outer ring hanging part 34 Inner ring hanging part 34A Female thread part 4 Plate fitting part 41 Plate arrangement surface 42 Annular standing part 5 Decorative plate 5A First layer (upper layer)
5B 2nd layer (lower layer)
51 peripheral edge 52 front surface 53 back surface 55A first gate protrusion 55B second gate protrusion C1 primary molding cavity C2 secondary molding cavity G1 primary molding gate G2 secondary molding gate M1 first mold M2 second mold M3 first 3 mold N1 primary mold N2 secondary mold

Claims (8)

A decorative plate manufacturing method for manufacturing a decorative plate made of a synthetic resin by dividing it into a first layer and a second layer in the thickness direction by double molding,
The first layer includes a first gate protruding portion protruding in a thickness direction toward the second layer at a peripheral edge thereof, and the second layer is formed in a thickness direction toward the first layer at a peripheral edge thereof. A protruding second gate protrusion,
Using a primary mold for molding the first layer and a secondary mold for laminating the second layer on the first layer,
The primary molding gate of the primary molding die is disposed at the first gate protrusion of the first layer, and the molten synthetic resin is placed from the primary molding gate at a position corresponding to the center of the second layer. Injecting and molding the first layer,
After the first layer is molded, the secondary molding gate of the secondary molding die is disposed on the second gate protruding portion of the second layer, and the synthetic resin is melted from the secondary molding gate. Is injected toward a position corresponding to the central portion of the first layer, and the second layer is laminated and formed on the first layer.   The first layer and the second layer respectively constitute an upper layer and a lower layer of the decorative plate, and a lower end of the first gate protrusion of the first layer is located on a back surface of the decorative plate. The method of manufacturing a decorative plate according to claim 1, wherein an upper end of the second gate protrusion of the second layer is located on a surface of the decorative plate.   The decorative plate has a substantially circular shape in plan view, and the first gate protruding portion of the first layer and the second gate protruding portion of the second layer are point-symmetric with respect to the center of the decorative plate. The manufacturing method of the decoration plate of Claim 1 or 2 arrange | positioned.   The method for manufacturing a decorative plate according to claim 1, wherein the synthetic resin is a transparent resin.   The synthetic resin comprises any one of a copolymer of polyethylene terephthalate and cyclohexanedimethanol, a copolymer of polycyclohexylenedimethylene terephthalate and isophthalic acid, or an acrylonitrile / butadiene / styrene copolymer. 4. A method for producing a decorative plate according to any one of 3 above.   A decorative plate manufactured by the method for manufacturing a decorative plate according to claim 1.   The decorative plate according to claim 6, wherein a metal foil is provided on a back surface of the decorative plate by a hot stamp method. A container with a decorative plate, comprising: a container body and a cap on which the mouth portion is fitted; and a decorative plate according to claim 6 fitted to a plate fitting portion provided on the top surface of the cap.