JP3553518B2 - Mold equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mold device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an injection molding machine, a resin as a molding material heated and melted in a heating cylinder is injected at a high pressure to fill a cavity space of a mold apparatus, and then cooled in the cavity space. Thus, a molded article can be obtained by solidification.
[0003]
The injection molding machine has a mold device, a mold clamping device, and an injection device, the mold device includes a fixed mold and a movable mold, and the mold clamping device has a fixed for attaching the fixed mold. A platen, a movable platen for attaching the movable mold, a mold clamping cylinder for moving the movable platen forward and backward, etc., the mold closing cylinder is driven, and the movable platen is moved forward and backward to close and close the mold of the mold apparatus. Clamping and mold opening can be performed, and a cavity space is formed between the fixed mold and the movable mold when the mold is clamped.
[0004]
On the other hand, the injection device includes a heating cylinder that heats and melts the resin, and an injection nozzle that injects the melted resin, and a screw is rotatably provided in the heating cylinder, and is disposed to be able to advance and retreat. You. Then, in the measuring step, the screw is rotated by a driving unit disposed at the rear end, and is retracted accordingly, and in the injection step, the screw is moved forward to inject resin from an injection nozzle, thereby forming a cavity. The space is filled.
[0005]
By the way, in in-mold label molding, a label is inserted into the cavity space in advance, and as the cavity space is filled with resin, the label is integrally attached to the surface of the molded product. ing. However, when the molded article is a container with a cantilever as described below, the label cannot be adhered well.
[0006]
FIG. 2 is a schematic view of a conventional cantilevered container.
[0007]
In the figure, reference numeral 11 denotes a container with a cantilevered foot as a molded product. The container 11 has a main body 12, a flange 13 formed integrally with an upper end of the main body 12, and a lower end of the main body 12. Consists of legs 14 formed integrally. The leg portion 14 includes a disc-shaped base 15 and a connecting portion 16 for connecting the main body portion 12 and the base 15 at a predetermined position on the outer peripheral edge of the base 15. A label 17 is integrally attached to the surface of the main body 12 of the container 11.
[0008]
Next, a mold device for molding the container 11 will be described.
[0009]
FIG. 3 is a sectional view of a conventional mold apparatus.
[0010]
In the figure, reference numeral 21 denotes a fixed mold attached to a not-shown fixed platen, 22 denotes a movable mold attached to a not-shown movable platen, and the movable mold 22 is moved forward and backward to fix the movable mold 22 to a fixed mold. It can be moved toward and away from the mold 21.
[0011]
The fixed mold 21 includes a bottom cavity 23, a support block 24 that supports the bottom cavity 23, a split unit 25 disposed adjacent to a front end (left end in the drawing) of the support block 24, It comprises a cavity 26 disposed adjacent to the front end of the support 25, a support block 27 for supporting the cavity 26, and two runner plates 28 and 29. The split unit 25 includes first and second splits 31 and 32. The cavity 26 has a ring-shaped block 33 at the front end. Then, a runner 38 is formed through the runner plate 28 and the bottom cavity 23, and a gate 39 is formed at the front end of the runner 38.
[0012]
On the other hand, the movable mold 22 includes a core plate 35 attached to a movable platen (not shown) and a core 36 attached to the core plate 35. The movable mold 22 moves forward and backward (left and right in the figure) by operating a mold clamping device (not shown). Direction). In order to release the container 11 (FIG. 2) from the core 36, a separator 37 is provided adjacent to the core 36, and an ejector (not shown) is provided to move the separator 37 forward and backward with respect to the core 36. A device is provided.
[0013]
Then, at the time of mold clamping, a first space C1 corresponding to the leg portion 14 is formed by the bottom cavity 23 and the split unit 25 in the main body portion 12 and the flange portion 13 by the split unit 25, the cavity 26, the core 36, and the separator 37. A corresponding second space C2 is formed, and the first and second spaces C1, C2 form a cavity space C.
[0014]
In the in-mold label molding, the label 17 is inserted into the cavity space C in advance, and the resin is filled in the cavity space C, and the label 17 is attached to the surface of the container 11.
[0015]
[Problems to be solved by the invention]
However, in the conventional mold apparatus, since the gate 39 is formed at a position corresponding to the center of the base 15, the resin that has entered the first space C1 from the gate 39 is not used in the first space C1. After flowing through the portion corresponding to the base 15, it flows through the portion corresponding to the connecting portion 16, and enters the second space C2 from the vertex p1 of the portion corresponding to the connecting portion 16. Therefore, the resin in which the label 17 is inserted cannot be evenly filled with the resin, and the label 17 is bent or wrinkled, or the resin enters between the cavity 26 and the label 17 to cover the resin. And the label 17 cannot be stuck to the surface of the container 11 accurately. Therefore, the quality of the container 11 deteriorates.
[0016]
Therefore, a back gate system in which a runner and a gate (not shown) are formed on the side of the core 36, filling is performed from the side of the second space C2, and the resin that has entered the second space C2 enters the first space C1. Mold apparatus is conceivable. However, in this type of mold apparatus, a beard-shaped gate residue or the like may be generated at the bottom of the inner peripheral surface of the main body 12, so that the container 11 is not suitable for use as a food container.
[0017]
The present invention solves the problems of the conventional mold device, and provides a mold device capable of accurately attaching a label to the surface of a molded product and improving the quality of the molded product. The purpose is to:
[0018]
[Means for Solving the Problems]
For this purpose, in the mold apparatus of the present invention, a molded product in which a leg portion including a base and a connecting portion is integrally formed at the lower end of the main body portion is formed.
[0019]
And a bottom unit, a split unit disposed adjacent to the bottom cavity and forming a first space corresponding to the leg between the bottom cavity, and a split unit adjacent to the split unit. And a core that is provided so as to be able to advance and retreat with respect to the cavity, and that forms a second space corresponding to the main body between the split unit and the cavity.
[0020]
The second space is formed to correspond to the body of the main body, and includes a portion for inserting a label and a portion formed to correspond to the bottom of the main body. In addition, a runner is formed through the split unit. A gate is formed at the front end of the runner so as to face the center of a portion formed corresponding to the bottom of the second space.
[0021]
In another mold apparatus of the present invention, the split unit further includes a first split and a second split which respectively assume an advanced position and a retracted position.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0023]
FIG. 4 is a perspective view of the cantilevered container according to the embodiment of the present invention.
[0024]
In the figure, reference numeral 51 denotes a cantilevered container as a molded product. The container 51 includes a main body 52, a flange 53 formed integrally with an upper end of the main body 52, and a lower end of the main body 52. It comprises a leg 54 formed integrally. The leg portion 54 includes a disc-shaped base 55 and a connecting portion 56 connecting the main body portion 52 and the base 55 at a predetermined position on the outer peripheral edge of the base 55. The main body 52 includes a body 61 and a bottom 62. Further, a through hole 63 is formed in the base 55, and a hollow 69 is formed in the connecting portion 56. Then, a label 57 is integrally attached to the surface of the body 61 of the container 51.
[0025]
Next, a mold device for molding the container 51 will be described.
[0026]
FIG. 1 is a sectional view showing a mold clamping state of a mold device according to an embodiment of the present invention. FIG. 5 is a sectional view showing a first step of a mold opening state of the mold device according to the embodiment of the present invention. 6 is a cross-sectional view showing a second step of the mold apparatus according to the embodiment of the present invention in an open state, and FIG. 7 is a view showing a third step of the mold apparatus in the open state of the mold apparatus according to the embodiment of the present invention. FIG. 8 is a sectional view showing a fourth step of the mold apparatus according to the embodiment of the present invention in an open state, and FIG. 9 is a fifth view of the mold apparatus according to the embodiment of the present invention in an open state. It is sectional drawing which shows the process of FIG.
[0027]
In the drawing, reference numeral 21 denotes a fixed mold attached to a fixed platen (not shown), and reference numeral 22 denotes a movable mold attached to a movable platen (not shown). The movable mold is moved forward and backward by a mold clamping device (not shown). The mold 22 can be moved toward and away from the fixed mold 21.
[0028]
The fixed mold 21 includes a bottom cavity 23, a support block 24 that supports the bottom cavity 23, a split unit 25 disposed adjacent to a front end (left end in the drawing) of the support block 24, It comprises a cavity 26 disposed adjacent to the front end of the support 25, a support block 27 for supporting the cavity 26, and two runner plates 28 and 29. The split unit 25 includes first and second splits 31 and 32. The cavity 26 has a ring-shaped block 33 at the front end. A runner 38 is formed through the runner plate 28, the bottom cavity 23, and the second split 32, and a gate 39 is formed at the front end of the runner 38. The first and second splits 31 and 32 take a forward position shown in FIG. 1 and a retracted position shown in FIG.
[0029]
On the other hand, the movable mold 22 includes a core plate 35 attached to a movable platen (not shown) and a core 36 attached to the core plate 35. The movable mold 22 moves forward and backward (in the left-right direction in the figure) by operating the mold clamping device. To). In order to release the container 51 from the core 36, a separator 37 is provided adjacent to the core 36, and an ejector device (not shown) is provided to move the separator 37 forward and backward with respect to the core 36. Is done. The flange portion 53 (FIG. 4) is brought into contact with the separator 37.
[0030]
In addition, the mold clamping device is provided with a mold clamping cylinder (not shown) as a mold clamping device driving unit, and the mold clamping device is operated by driving the mold clamping cylinder, thereby closing the mold of the mold device, and closing the mold. Tightening and mold opening can be performed. In addition, the ejector device includes a crosshead, an ejector rod attached to the crosshead and having the separator 37 attached to a front end thereof, and an ejector cylinder as a driving unit that advances and retreats the separator 37 via the ejector rod. Prepare.
[0031]
Then, when the mold clamping device is operated and the mold is closed, and subsequently, the mold is clamped, the first space C1 corresponding to the leg portion 14 is formed by the bottom cavity 23 and the split unit 25 into the split space. The unit 25, the cavity 26, the core 36, and the separator 37 form a second space C2 corresponding to the main body portion 12 and the flange portion 13, and the first and second spaces C1, C2 form a cavity space C. You.
[0032]
In the in-mold label molding, the label 57 is inserted into the cavity space C before the mold is closed.
[0033]
When a resin as a molding material is injected from an injection nozzle of an injection device (not shown), the injected resin passes through the runner 38, enters the second space C2 via the gate 39, and subsequently, 1 enters the space C1. The resin that has entered the second space C2 presses the label 57 against the inner peripheral surface of the cavity 26 and the block 33, and flows through the second space C2. Thus, the label 57 is attached to the surface of the container 51 as the cavity space C is filled with the resin.
[0034]
By the way, in the present embodiment, first, the gate 39 is formed facing the center of the second space C2 in order to allow the resin to enter the second space C2. , Through the bottom cavity 23 and the second split 32. Further, a through hole 63 is formed in the base 55 at the front end face (left end face in the figure) of the bottom cavity 23 so that the resin flowing in the runner 38 does not enter the first space C1. For this purpose, a cut portion 65 is formed by a circular protrusion, and the runner 38 is penetrated through the cut portion 65. A cut-out portion 66 is formed by a circular protrusion on the surface of the first split 31 facing the second split 32 to form a hollow 69 in the connecting portion 56.
[0035]
Subsequently, mold opening is started, a drive mechanism (not shown) is operated, and as shown in FIG. 5, the runner plate 29 is moved backward (moved rightward in the figure), and accordingly, the runner 38 is also moved backward. Let me do. In the present embodiment, the runner 38 has a tubular structure so that resin flows inside. Accordingly, a hole 68 having a shape corresponding to the runner 38 penetrating through the runner plate 28, the bottom cavity 23, and the second split 32 is formed.
[0036]
Next, the drive mechanism is operated, and as shown in FIG. 6, after the runner plate 28, the bottom cavity 23 and the support block 24 are retracted, as shown in FIG. Is moved in the direction of arrow A, and the second split 32 is moved in the direction of arrow B, and is placed in the retracted position.
[0037]
Subsequently, when the mold clamping device is operated and the movable mold 22 is retracted (moved to the left in the figure) as shown in FIG. 8, the core 36 is taken out of the cavity 26, and at this time, the container 51 is attached to the core 36 and left on the movable mold 22 side.
[0038]
Then, as shown in FIG. 9, air is blown out from an air outlet (not shown) formed in the core 36, and the ejector device is operated to move the separator 37 forward via an ejector rod (see FIG. 9). The container 51 is released from the movable mold 22. In this way, the mold is opened and the container 51 is released.
[0039]
As described above, the runner 38 is formed through the predetermined split of the split unit 25, in this embodiment, the second split 32, so that the gate 39 faces the second space C2. Can be formed. Therefore, in the cavity space C, the portion where the label 57 is inserted can be evenly filled with the resin, so that the label 57 is bent, wrinkled, or the like, or the resin is filled between the cavity 26 and the label 57. No resin fogging occurs due to intrusion. As a result, the label 57 can be accurately attached to the surface of the container 51, and the quality of the container 51 can be improved.
[0040]
Further, since it is not necessary to dispose a gate on the core 36 side, a beard-shaped gate residue or the like does not occur on the bottom 62. Therefore, the container 51 is suitable for use as a food container.
[0041]
In the present embodiment, in order to allow the runner 38 to penetrate through the second split 32, a circular cut-out portion 65 is formed in the bottom cavity 23, and a circular through-hole 63 is formed in the base 55. However, it is also possible to form a cut-off portion of another shape in the bottom cavity 23, and in that case, a through-hole corresponding to the shape of the cut-off portion is formed in the base 55. Also, notches can be formed in the base 55 instead of holes.
[0042]
It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.
[0043]
【The invention's effect】
As described above in detail, according to the present invention, in the mold device, a molded product in which the leg portion including the base and the connecting portion is integrally formed at the lower end of the main body portion is formed. .
[0044]
And a bottom unit, a split unit disposed adjacent to the bottom cavity and forming a first space corresponding to the leg between the bottom cavity, and a split unit adjacent to the split unit. And a core that is provided so as to be able to advance and retreat with respect to the cavity, and that forms a second space corresponding to the main body between the split unit and the cavity.
[0045]
The second space is formed to correspond to the body of the main body, and includes a portion for inserting a label and a portion formed to correspond to the bottom of the main body. In addition, a runner is formed through the split unit. A gate is formed at the front end of the runner so as to face the center of a portion formed corresponding to the bottom of the second space.
[0046]
In this case, the second space is formed so as to correspond to the body of the main body, and includes a portion for inserting a label, and a portion formed to correspond to the bottom of the main body, and the split unit includes Is formed, and a gate is formed at the front end of the runner so as to face the center of a portion formed corresponding to the bottom of the second space, so that the label is inserted in the cavity space. Resin can be evenly filled in the set portion. Therefore, the label is not bent or wrinkled, and the resin does not enter between the cavity and the label to cause resin fogging. And the quality of the molded article can be improved.
[0047]
Further, since there is no need to dispose a gate on the core side, a beard-shaped gate residue or the like does not occur at the bottom. Therefore, the molded article is suitable for use as a food container.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a mold clamping state of a mold device according to an embodiment of the present invention.
FIG. 2 is a schematic view of a conventional cantilevered container.
FIG. 3 is a sectional view of a conventional mold apparatus.
FIG. 4 is a perspective view of a container with a cantilever in the embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a first step in a mold open state of the mold apparatus according to the embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a second step in a mold open state of the mold apparatus according to the embodiment of the present invention.
FIG. 7 is a cross-sectional view showing a third step in a mold open state of the mold apparatus according to the embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a fourth step in a mold open state of the mold apparatus according to the embodiment of the present invention.
FIG. 9 is a cross-sectional view showing a fifth step in a mold open state of the mold apparatus according to the embodiment of the present invention.
[Explanation of symbols]
23 Bottom cavity 25 Split unit 26 Cavities 31, 32 First and second splits 36 Core 38 Runner 39 Gate 52 Main body 54 Leg 55 Base 56 Connection C1, C2 First and second spaces

Claims (2)

In a mold device for molding a molded product in which a leg portion including a base and a connecting portion is integrally formed at a lower end of a main body portion,
(A) a bottom cavity;
(B) a split unit disposed adjacent to the bottom cavity to form a first space corresponding to the leg between the split unit and the bottom cavity;
(C) a cavity disposed adjacent to the split unit;
(D) a core that is provided to be able to advance and retreat with respect to the cavity, and that forms a second space corresponding to the main body between the split unit and the cavity;
(E) the second space is formed corresponding to the body of the main body, and includes a part for inserting a label, and a part formed corresponding to the bottom of the main body;
(F) a runner is formed through the split unit,
(G) A mold device, wherein a gate is formed at a front end of the runner so as to face a center of a portion formed corresponding to a bottom in the second space. The mold apparatus according to claim 1, wherein the split unit includes first and second splits that respectively take an advanced position and a retracted position.

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