JP4346785B2 - How to remove the baby bottle nipple from the mold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for removing an injection-molded product from a mold, and more particularly, to a method for removing a baby bottle nipple having a hollow portion from a mold.
[0002]
[Prior art]
Conventionally, for example, a baby bottle nipple molded from a thermosetting resin such as silicon rubber has a nipple 1 with a smart base end as shown in FIG. Thus, it can be roughly classified into a round nipple 2 whose base end side bulges outward.
Normally, when the mold is opened after injection molding, the injection-molded molded product is in close contact with the female side (fixed mold 3 side) and that of the male side (movable mold 4 side). There is. Therefore, there are molded products that are removed from the fixed mold 3 and those that are removed from the movable mold 4. Here, when considering how to remove from the fixed mold 3 or the movable mold 4, the molded product is characterized in that it is easier to remove from the mold if it is removed from the male side.
[0003]
On the other hand, when injection molding a product with a hollow portion such as a nipple for baby bottles, the position of the gate corresponds to the case where it is provided at the position corresponding to the nipple of the molded product, and the flange on the opposite side of the nipple There are two ways of providing the position. FIG. 5 shows a mold apparatus in the case where a gate is provided in the flange portion.
In this mold apparatus 5, a gap 8 corresponding to the nipple is formed on the joint surface between the fixed mold 6 and the movable mold 7, and a gate 11 is opened at a portion corresponding to the flange portion 10 of the gap 8. . A nozzle 12 is set on the gate 11.
[0004]
When the resin is injected from such a gate 11, as the resin is filled into the gap 8, the internal air loses its place and is compressed, so that the nipple 8 a serving as the final arrival part of the resin The resin is difficult to be filled in the vicinity.
Therefore, in such a mold apparatus 5, in order to allow the internal compressed air to escape from the final arrival part, the sliding part 14 that is movable in the axial direction is passed through the movable part main body 13 and the resin is poured. Compressed air generated in the air is escaped from the space between the sliding shaft 14 serving as a gap of the movable body 13 and the like.
[0005]
When the injection molding is completed and the fixed mold 6 and the movable mold 7 are opened, the molded product is taken out in a state of being stuck to the outer peripheral surface of the movable body 13 because the flange portion 10 is fixed. Come. In order to separate the molded product in this state from the movable part main body 13, compressed air is introduced into the molded product through the gap between the sliding shaft 14 and the hole 15, and the molded product is removed from the mold with this compressed air. I try to keep them apart.
[0006]
By such a method, a molded product having a hollow portion such as a nipple can be removed from the mold.
[0007]
[Problems to be solved by the invention]
By the way, it is possible to mold the nipple by such a method and remove it from the state of sticking to the mold. However, in the above method, the movable shaft housing the sliding shaft 14 is formed at the time of injection molding. The resin may enter the tip of the air hole 15 which is a gap with the body part 13 from the nipple 8a side. If the resin enters this part, as a result, the inside of the molded product, that is, the shaft 14 is obtained. There was a problem of generating burrs in the moving direction. As for this burr, the tendency that the movable part main body 13 and the sliding shaft 14 were worn and increased by repeated use of the mold was observed. Thus, when burrs were formed, the workers had to be removed manually one by one.
[0008]
The present invention has been made in view of such problems, and does not generate burrs or the like on a baby bottle nipple having a hollow portion , and the hemispherical top portion is uniformly filled with a resin. It is an object of the present invention to provide a method for removing a baby bottle nipple from a mold, which can be easily removed from the mold.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the method of removing a baby bottle nipple from a mold according to the present invention comprises a movable mold that defines an inner surface side of a baby bottle nipple having a hollow portion and an outer surface side of the baby bottle nipple . And having a gate opened in a gap corresponding to the teat of the nipple formed by the mold,
After injection molding, when the fixed mold and the movable mold are opened, the baby bottle nipple is in close contact with the movable mold, and the fixed mold and the movable mold are separated from each other. In the removal method from the mold,
The movable mold, a movable body which forms the base side of the baby bottle nipples, as well as configured to include a slide core for forming the front end side of the baby bottle nipples, the movable slide core A position that is supported by a shaft member that is movably inserted into a through hole provided in the main part of the body, and that the outer peripheral part of the joint surface of the movable part main body and the slide core is substantially perpendicular to the injection direction from the gate. After the fixed mold and the movable mold are opened, compressed air is introduced into the through hole portion through which the shaft member is inserted, and the compressed air is introduced into the nipple for the baby bottle . By introducing it into the side surface, the nipple for baby bottles in close contact with the movable mold is separated from the movable mold.
[0010]
According to such a method, when resin is injected from the gate, there is no gap that becomes the joint surface of the slide core in the same direction as the resin flows, so that the resin corresponds to the nipple as before. Never get inside the gap. Therefore, the generation of burrs in this portion can be suppressed. In addition, since the injected resin flows from the hemispherical nipple near the fixed mold toward the hem side, the compressed air formed along with this flows is accumulated in the vicinity of the flange portion of the hem portion. Since the joint surface of the mold component fixture exists in the vicinity of the flange portion, compressed air such as a teat can escape outward from the gap between the mold component parts. Further, in order to remove the molded product attached to the mold from the mold, the molded product can be removed from the mold by introducing compressed air into the gap between the sliding shaft and the hole.
[0011]
According to the present invention, together with the bonding surfaces by injection is crimped, since the opening of the joint surface is substantially perpendicular position with respect to the exit direction from the gate, Kukunaru burr occurs.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a main part of a mold in which a method for removing a baby bottle nipple according to an embodiment of the present invention is performed.
In FIG. 1, reference numeral 20 is a fixed mold of the mold, reference numeral 21 is a movable mold, and a round type bulging outward between the joints of the fixed mold 20 and the movable mold 21. A gap 24 corresponding to the nipple is formed.
[0014]
The fixed mold 20 has a concave portion 22, and the movable mold 21 has a convex movable portion main body 23 smaller than the concave portion 22, and a hemispherical slide core 25 integrally formed at the tip of the movable portion main body 23. Thus, the shape of the nipple is configured.
On the fixed mold 20 side, a gate 31 is opened at a portion corresponding to the hemispherical papilla of the gap 24, and a needle 32 for flow rate adjustment is provided on the gate 31 so as to be movable up and down. Therefore, in this mold apparatus, when the resin is filled from the gate 31, the resin flows toward the portion corresponding to the flange portion 33.
[0015]
On the other hand, the slide core 25 has a hemispherical tip end, and the outer peripheral portion has a joint surface with the movable portion main body 23 in a direction (AA direction) substantially perpendicular to the shaft 26. The joint surface is pressure-bonded by resin at the time of injection. In addition, a through hole 30 is formed in the movable portion main body 23 in the axial direction, and the above-described slide core 25 is integrally formed at the tip of the shaft 26 inserted through the through hole 30. Therefore, the slide core 25 can be separated from the movable portion main body 23 as the shaft 26 slides.
[0016]
In FIG. 1, reference numeral 29 indicates a pin for making a hole in the flange portion of the molded product. By making a hole in the flange portion with this pin, the amount of milk that has flown out to the inside of the baby bottle is shown. The corresponding air can be taken in. Reference numeral 50 denotes a pin for opening a round hole having a diameter of 0.3 to 0.5 mm for sucking milk or a hole such as a Y shape or an X shape.
[0017]
In such a mold apparatus, a liquid thermosetting resin cooled by a cooling apparatus (not shown) is injected from the gate 31 into the mold, and the fixed mold 20 and the movable mold 21 are joined. The space 24 is filled with a thermosetting resin.
Thereafter, when the mold is opened, as shown in FIG. 2, the injected molded product 35 can be taken out in a state of being integrated with the movable portion main body 23. Then, if compressed air is introduced into the gap between the hole 30 and the shaft 26 from this state, the compressed air enters between the joints between the molded product 35 and the movable part main body 23 as shown by the arrows in the figure, In the direction toward the tip of the nipple, an air layer spreads inside, and the molded product 35 can be easily removed from the mold.
[0018]
As described above, according to the method of the present invention, the closely attached molded product can be easily taken out, so that it is possible to automate the removal of the molded product and the storage and storage. Furthermore, since there is no joint surface between the slide core 25 and the movable part main body in the resin injection direction from the gate, the resin does not enter the gap with the injected force unlike the conventional example. Further, after releasing the mold, the molded product can be easily taken out by introducing compressed air. Therefore, according to the method of the present invention, a round baby bottle nipple can be molded without providing a burr and can be automatically removed from the mold.
[0019]
Although the method according to the embodiment of the present invention has been described above, the present invention is not limited to this. For example, the mold shape and the nipple shape are not limited to the examples. Moreover, the joint part of the slide core 25 and the movable part main body 23 may have other shapes. In short, these joint surfaces are surfaces that are substantially perpendicular to the axial direction, such as line AA. it is in contact with. That is , it is only necessary that the outer peripheral portion of the joint surface be faced at a position substantially perpendicular to the axial direction of the shaft 26 as shown in FIG . FIG. 3 shows a reference example in which the structure of the joint surface between the slide core 25 ′ and the movable portion main body 23 ′ is set so as to be inclined obliquely toward the gate side . With the structure of this reference example , the compressed air can be more positively supplied to the nipple tip side. This reference example does not belong to the present invention .
[0020]
【The invention's effect】
As described above, according to the method for removing the baby bottle nipple from the mold according to the present invention, since the gap of the slide core is not formed in the resin flow direction, the resin enters the gap here. No burrs are formed. Further, by introducing air from the gap between the shafts, the molded product can be easily taken out from the mold.
[0021]
According to the present invention, a nipple for a baby bottle can be formed without burrs like a round nipple that bulges outward, and the nipple can be easily and automatically removed.
[Brief description of the drawings]
FIG. 1 is a sectional view of an essential part of a mold apparatus in which a method of the present invention is carried out.
FIG. 2 is a cross-sectional view when the mold apparatus is opened and compressed air is introduced.
FIG. 3 is a sectional view showing a structure of a joint portion between a slide core and a movable portion main body , which is a reference example of the present invention.
FIG. 4 is a schematic cross-sectional view of a mold showing the shape of a nipple for a baby bottle, FIG. 4 (A) is an explanatory view of a smart nipple mold apparatus, and FIG. It is explanatory drawing of a metal mold apparatus.
FIG. 5 is a cross-sectional view of a mold apparatus when a nipple is molded by a conventional method.
[Explanation of symbols]
20 fixed mold 21 movable mold 23 movable section main body 24 gap 25 slide core 26 shaft member 31 gate 33 flange section

Claims (1)

A movable mold that defines an inner surface side of a baby bottle nipple having a hollow portion, a fixed mold that defines an outer surface side of the baby bottle nipple , and a gap corresponding to the teat of the nipple formed by the mold. Having an open gate,
After injection molding, when the fixed mold and the movable mold are opened, the baby bottle nipple is in close contact with the movable mold, and the fixed mold and the movable mold are separated from each other. In the removal method from the mold,
The movable mold, a movable body which forms the base side of the baby bottle nipples, as well as configured to include a slide core for forming the front end side of the baby bottle nipples, the movable slide core A position that is supported by a shaft member that is movably inserted into a through hole provided in the main part of the body, and that the outer peripheral part of the joint surface of the movable part main body and the slide core is substantially perpendicular to the injection direction from the gate. After the fixed mold and the movable mold are opened, compressed air is introduced into the through hole portion through which the shaft member is inserted, and the compressed air is introduced into the nipple for the baby bottle . by introducing the side, how to remove from the mold of baby bottle nipples, characterized in that the contact has been baby bottle nipples to said movable die so as to separated from the movable mold.

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