KR20120127245A

KR20120127245A - Lid mold and method of manufacturing the lid

Info

Publication number: KR20120127245A
Application number: KR1020120048501A
Authority: KR
Inventors: 치-주이 훙
Original assignee: 치-주이 훙
Priority date: 2011-05-13
Filing date: 2012-05-08
Publication date: 2012-11-21

Abstract

The present invention relates to a cup lid molding mold, and comprises a male mold and a female mold. The male mold includes a protrusion, an edge portion, and a first air passage, wherein the edge portion is formed in an annular shape around the protrusion, and a gap is formed between the protrusion and the edge portion, and the first air passage is Communicate the gap with the external space. The female mold comprises an annular recess. When the male mold and the female mold are combined, a mold cavity and a second air passage communicating with the mold cavity and the external space are formed between the male mold and the female mold. The mold cavity communicates with the gap, and the mold cavity extends from the rim and past the protrusion to the recess. After the male mold and the female mold according to the present invention are combined and the material is injected, the injected plastic quickly fills the mold cavity and the gap. At this time, the air spaced apart from the mold cavity is quickly discharged along the first air passage and the second air passage, respectively, thereby increasing the injection molding efficiency.

Description

Cup lid molding mold and cup lid manufacturing method using the molding mold {Lid mold and method of manufacturing the lid}

The present invention relates to a cup lid molding mold and a cup lid manufacturing method using the molding mold.

Cup lid according to the prior art, as disclosed in the TW M384844, is configured to include an outer rim fitting and the inner rim insert, it is formed so that the rim end of the lid is fitted. The edge portion to be fitted is in close contact with the inlet of the main body, by a stable fit and the close coupling force, the lid is not loosely formed arbitrarily, so that the liquid inside the cup does not flow out.

However, the vent hole of the cup lid mold according to the prior art is formed to be positioned around the end of the mold cavity, and communicates the mold cavity and the outer space, when the plastic is injected into the mold cavity, the mold cavity Air from the beginning is discharged through the discharge hole. However, in the mold cavity, an annular coupling piece inside is molded to prevent direct communication with the exhaust hole, so that some of the air from the beginning cannot be discharged through the exhaust hole. Due to this, a lot of air is mixed in the plastic during injection molding, it is not easy to fill the mold cavity, and as a result the inner annular coupling piece is not molded properly. As described above, there is a problem in that the cup lid injection molding method according to the prior art cannot manufacture a cup lid in which a complete inner annular coupling piece is molded.

1.TW M384844

In order to solve the above-mentioned problems of the prior art, the present invention is to provide a molding mold by efficiently injection molding the cup lid, the shell lid is in close contact with the cup inlet so that the liquid inside the cup does not flow out. .

In order to achieve the above object, the cup lid molding mold provided by the present invention comprises a male mold and a female mold. The male mold includes a protrusion, an edge portion, and a first air passage, wherein the edge portion is formed in an annular shape around the protrusion, and a gap is formed between the protrusion and the edge portion, and the first air passage is Communicate the gap with the external space. The female mold comprises an annular recess. When joining the male mold and the female mold, the protrusion and the rim are located in the recess, and a mold cavity of a predetermined shape and a second air passage communicating the mold cavity and the external space are formed between the male mold and the female mold. The mold cavity communicates with the gap, and the mold cavity extends from the rim and past the protrusion to the recess.

Through the above-described structure, the molding mold according to the present invention, after the male mold and the female mold are combined and the plastic material is injected, the injected plastic quickly fills the mold cavity and the gap. At this time, the air spaced apart from the mold cavity is quickly discharged along the first air passage and the second air passage, respectively, thereby increasing the injection molding efficiency. The plastic filling the rim and the recess forms the outer rim insert, and the plastic filling the gap forms the inner rim insert. The outer edge fitting portion and the inner edge insertion portion form a coupling edge groove, and the injection molded cup lid is tightly coupled to the cup inlet through the coupling edge groove so that the liquid inside the cup does not count out.

1 is a stereoscopic exploded view of the present invention.
2 is a side cross-sectional view of the present invention.
3 is a local enlarged view of FIG. 2.
Figure 4 is a three-dimensional view of the cup lid injection molded according to the present invention.
Figure 5 is a side cross-sectional view of a cup lid injection molded according to the present invention.

See FIGS. 1 to 3. Cup lid molding mold provided by the present invention comprises a male mold (1) projecting convexly and a female mold (2) recessed.

The male mold includes a protrusion 11, an edge portion 12, and a first air passage 13, wherein the edge portion is formed in an annular shape at the periphery of the protrusion, and a gap 14 is formed between the protrusion and the edge portion. Is formed, the first air passage communicates the gap and the external space.

The female mold includes an annular recess 21. When joining the male mold and the female mold, the protrusion and the rim are located in the recess, and the mold cavity 3 having a predetermined shape and a second air passage communicating the mold cavity and the external space between the male mold and the female mold ( 4) is formed. The mold cavity communicates with the gap, and the mold cavity extends from the rim and past the protrusion to the recess.

In detail, the shape of the concave portion and the shape of the protrusion and the edge portion correspond to each other, and when the molding mold is coupled to each other, the male mold and the female mold form a cup lid-shaped mold cavity. As shown in Fig. 2, when the male mold and the female mold are combined, the thickness of the mold cavity and the gap formed therebetween is 0.3 mm to 0.5 mm. After the mold 5 and the plastic 5 filling the gap are cooled and shrunk through the structure, the thickness of the cup lid is 0.3 to 0.4 mm. Using an appropriate amount of plastic in the injection molding process, it is molded to have a good bond strength, allowing cup openings of varying thickness to be combined with the lid. In addition, the thickness of the first air passage is preferably 0.1 mm, so that the plastic is not reintroduced into the first air passage again after filling the gap, so that the edge of the cold-formed cup lid is not broken.

In the present embodiment, a material injection hole 22 is formed in the arm mold, and the material injection hole communicates the mold cavity with an external space. A hole 15 is formed in the male mold corresponding to the material injection hole. Here, the material injection hole is preferably located in the center of the mold cavity. When injecting the plastic material in the outer space, the injected plastic is diffused in all directions to fill the mold cavity and the gap uniformly and quickly. In addition, since the plastic close to the mold cavity is relatively far from the plastic heater and the separation time is relatively long, its temperature is relatively low and it is easily hardened and cooled. For this reason, the plastic that has been first injected and hardened and cooled prevents the injection of the relatively high temperature liquefied plastic, preventing the liquefied plastic from filling the mold cavity and the gap completely. However, in the present invention, when the hole is formed at a position corresponding to the material injection hole, and when the plastic is injected into the material injection hole, the plastic close to the mold cavity is first injected into the hole, followed by the plastic that is relatively far from the mold cavity. Flow in. This allows the low temperature plastic, which is preferentially injected into the mold cavity, to be injected into the hole and solidify, so that the high temperature liquid plastic is then smoothly injected into the mold cavity. In another embodiment, a material injection hole may be formed on the male mold, and holes may be formed on the female mold correspondingly.

See FIGS. 1 to 3. Cup lid molding mold according to the above-described structural features to produce a cup lid that is fitted with the cup inlet fast and efficiently according to the steps listed below. The steps comprise the following: Comprising a molding mold having the above-described structure, wherein the molding mold comprises a male mold and a female mold, the male mold and the female mold is coupled, the plastic is injected into the mold cavity through the material injection hole Thereafter, the plastic fills the gap with the mold cavity, and the air in the gap with the mold cavity is quickly discharged along the first air passage and the second air passage, respectively; And after cooling the plastic, opening the molding mold to take out the cooled molded plastic and separating it from the molding mold to obtain a shell lid. To further explain this, when joining the molding mold, the second air passage is formed at the edge end of the mold cavity, and the plastic injected into the mold cavity is formed in the same way as the air discharge passage provided in the molding mold of a general type. Push out the air in the air and let it out through the second air passage. Since the gap and the mold cavity are in communication, the plastic is injected and at the same time the plastic is introduced into the gap and pushes the air inside the gap to be discharged through the first air passage. This allows the plastic to quickly fill the gap with the mold cavity, thereby forming without being affected by the air from the beginning.

4 and 5 are explanatory views of the cup lid 6 injection molded according to the present invention, see this. The shape of the cup lid is to vary depending on the shape of the mold cavity and the interval corresponding to each other, it comprises a lid 61. 4 and 5, the outer edge fitting portion 62 and the inner edge inserting portion 63 corresponding to the outer edge fitting portion are formed at the end edge of the lid body, so that the lid body is below. To form a joining border groove 64 having an opening opened toward the end. When the lid body is engaged with the cup inlet, the cup lid is tightly fitted with the cup inlet through the joining rim groove. Specifically, the gap 14 between the rim and the protrusion becomes a molding space of the inner rim insert, and the outer rim fitting is a plastic starting from the rim in the mold cavity and reaching the recess through the protrusion. It is injected and molded. In other words, the outer contour of the frame portion corresponds to the inner contour of the coupling border groove of the cup lid. In an embodiment of the present invention, an edge groove portion 16 is further formed in the edge portion, wherein the edge groove portion is located at the edge portion away from the protrusion and is in communication with the mold cavity. Specifically, as shown in FIG. 1, the edge groove surrounds the outer side of the edge portion in an annular shape. In addition, the outer edge fitting formed between the recess and the edge forms a convex rib 65 correspondingly. The convex ribs support the cup inlet located in the joining rim groove so that the cup inlet is not randomly released from the joining rim groove.

In summary, the cup lid molding mold according to the present invention injects the plastic into the mold cavity, the air in the mold cavity and the gap is discharged through the first air passage and the second air passage, In the injection molding process, the plastic fills the mold cavity and gaps quickly and uniformly, so as to efficiently produce a cup lid having a joining edge groove. In addition, the joint rim groove formed by injecting plastic into the gap and the mold cavity to have a suitable thickness, so that the joining rim groove is extended and fitted to the outside when combined with the cup inlet formed in a variety of thickness, Provide a certain structural strength so that it is not easily separated from the cup inlet by external pressure. As described above, the present invention improves the efficiency of the cup lid injection molding, and the manufactured cup lid is provided with a joining rim groove to be fitted with the cup inlet, thereby preventing liquid from flowing out of the cup.

DESCRIPTION OF SYMBOLS 1 Male mold 11 Projection part 12 Edge part
13 first air passage 14 interval 15 hole
16: edge groove portion 2: arm mold 21: recessed portion
22: material injection hole 3: mold cavity 4: the second air passage
5: plastic 6: cup lid 61: lid body
62: outer border insert 63: inner border insert
64: joining edge groove 65: block rib

Claims

And a protrusion, an edge portion, and a first air passage, wherein the edge portion is formed in an annular shape around the protrusion, and a gap is formed between the protrusion and the edge portion, and the first air passage is spaced apart from the protrusion portion. A male mold in communication with the external space; And
A female mold including an annular recess,
When the male mold and the female mold are coupled, the protrusion and the edge portion are positioned in the concave portion, and the mold mold and the mold cavity and the external space communicate with each other between the male mold and the female mold. 2. An air passage is formed, wherein the mold cavity communicates with the gap, and the mold cavity extends from the rim to the protrusion and extends to the recess.

The method of claim 1, wherein a material injection hole is formed in any one of the female mold and the male mold, the material injection hole is in communication with the mold cavity and the outer space, the other of the female mold and the male mold is a hole Is formed, the hole is formed in a position corresponding to each other with the material injection hole, the cup lid molding mold.

The cup lid molding mold according to claim 1, wherein an edge groove portion is formed in the edge portion away from the protrusion portion, and the edge groove portion is in communication with the mold cavity.

The cup lid forming mold according to claim 2, wherein an edge groove portion is formed in the edge portion away from the protrusion portion, and the edge groove portion is in communication with the mold cavity.

The cup lid molding mold according to any one of claims 1 to 4, wherein the mold cavity and the gap have a thickness of 0.3 mm to 0.5 mm.

The cup lid molding mold according to any one of claims 1 to 4, wherein the first air passage has a thickness of 0.1 mm.

The cup lid molding mold of claim 1, wherein the first air passage has a thickness of 0.1 mm.

Providing a cup lid molding mold according to any one of claims 1 to 4;
After the molding mold is bonded and the plastic is injected into the mold cavity, the plastic fills the gap with the mold cavity, and the air outside the mold cavity and the gap is externally formed along the first air passage and the second air passage, respectively. Discharging to space; And
After cooling the plastic, a cup lid manufacturing method comprising the step of opening the molding mold and taking out the cooled molded plastic from the molding mold.