KR100843186B1 - A mold and a process thereof - Google Patents

Abstract

A mold for a lid is provided to prevent a handle from being broken when extracting an undercut of the grip by minimizing an open angle between a lid and the handle. A mold for a lid comprises a core(120) and a cavity(220). A grip having an undercut is connected to the lid through a folding connection part. The core includes a slide core(124) and a slide groove(122) for guiding the slide core. The slide core elastically pushes a molding surface of the grip when the mold is open to form the grip such that the undercut is extracted when the grip is folded through the folding connection part. An elastic member(126) is mounted on the slide groove to elastically support the slide core.

Description

Mold for Container Lid and Forming Method {A MOLD AND A PROCESS THEREOF}

The present invention relates to a mold for injection molding the lid of the container, and more particularly, when extracting the undercut of the opening and closing handle provided on the lid to open and close the container, minimizes the angle between the opening and closing handle on the lid with a smooth folding The present invention relates to a mold for a container lid capable of preventing breakage in advance and a molding method thereof.

As is well known, a hermetic container is a container containing food for sealing, and a conventional hermetic container includes a container having an opening for containing food and a lid for opening and closing the opening of the container. And the container is formed with a locking groove along the outer circumferential edge of the opening, the lid is connected to a plurality of opening and closing handles provided with a locking projection to be locked to the locking groove foldable connection.

In the conventional sealed container configured as described above, when the opening and closing handle is folded with the folding connection part while the lid is seated on the opening of the container, the container is sealed while the locking protrusion is coupled to the locking groove.

The above-mentioned closed container is molded by an injection mold, and the locking protrusion protrudes into an inner side of the opening / closing handle extended horizontally on the lid to form an undercut, so that a general injection mold cannot be opened. There was this. Therefore, the auxiliary core and the eject pin are formed to be inclined so that extraction of the lid having the undercut is inclined, but the auxiliary core is complicated in structure, leading to an increase in the manufacturing cost of the injection mold, and further forming process. There was a problem that can not be added to improve productivity.

In order to solve the above problems, Patent Application No. 2003-39616 claim 4 has a 'container body having a catching portion, and having a hook coupled to the upper side of the container body and engaged with the catching portion on its outer circumference. In the method of manufacturing a closed container comprising a lid formed integrally with one lock wing, forming a mold groove so as to have a shape of the lid spreading the lock wing on the contact surface of the lower mold and the upper mold for manufacturing the lid, By inserting the mold groove so that the locking blade portion is inclined upward with respect to the upper surface of the lid so that the hook which protrudes inclined inwardly in the vertical direction is inclined upward with respect to the upper surface of the lid, an additional partial core is applied to the hook portion during the injection operation. The manufacturing method of the sealed container, characterized in that the upper and lower molds are separated from each other even if not used. There.

Here, the locking portion is formed to protrude downwardly outward from the container body, the hook is placed in the vertical direction at any point where the locking wing is rotated with respect to the lid surface inclined upwardly, but both sides thereof constitute a vertical plane. will be.

In order to erect the hook in the vertical direction in the lid formed by the above-described conventional manufacturing method, when the vertical virtual line is drawn with the surface of the lid as a horizontal line so that the hook is engaged with the engaging portion, a predetermined angle between the lower vertical line and the locking wing Is formed, the constant angle is actually made of approximately 100 ~ 120 °, this is a lock wing formed while maintaining a constant angle there was a problem that the hinge portion is not smoothly folded when engaging the hook to the hook.

In other words, the locking blade rotates along the opposite direction of the predetermined angle around the hinge portion to enable engagement of the hook and the hook portion, wherein the hinge formed at a predetermined angle is rotated while being rapidly deformed, and thus it is not smooth and repeated use. The break is facilitated by.

In other words, the synthetic resin used as the material of the lid is made of a polymer compound having a molecular weight of 10,000 or more, and has a creep characteristic in which deformation is increased by external force. Referring to this characteristic, since the lid is molded in a state in which the predetermined angle is smaller than the angle between the bottom and the locking blade, the locking blade is rotated in a certain angle direction is smoother than rotating in the opposite direction, As much as possible, reducing the angle between the bottom of the lid and the locking wing can prevent creep and improve the durability of the hinge.

In addition, the lid formed by the conventional manufacturing method is possible only when the hook is formed to be inclined downward as described above, and the hook engaged with the hook is formed to be inclined upward, which is extremely limited in forming the lid. There was a problem.

The present invention has been made to solve the conventional problems as described above, an object of the present invention is to provide a container lid mold and a molding method capable of gently folding the opening and closing handle with the extraction for the undercut of the opening and closing handle. have.

The mold for a container lid for achieving the above object, in the mold consisting of a core and a cavity for forming a lid connected to the folding groove of the opening and closing handle having an undercut to be coupled to the locking groove of the container, the core, When the mold is opened while forming at least one surface, the opening and closing handle is folded to the fold connection portion and provided with a slide core to elastically push the molding surface so that the undercut can be extracted and a slide groove to guide the sliding of the slide core. The slide groove is to mount an elastic member to elastically support the slide core.

Here, the elastic member is preferably made of a coil spring, but may be implemented as a leaf spring, if necessary, wherein the slide groove is formed with a receiving groove so that the coil spring is accommodated, the inner diameter of the coil spring on the slide core A guide bar is formed to guide the sliding to.

And the slide core is provided with a stopper to prevent the departure from the slide groove.

On the other hand, the molding method of the container lid for achieving the above object, the closing step of closing the mold made of a core and cavity formed to mold the lid connected to the opening and closing handle having an undercut is connected to the locking groove of the container by folding connection; Injecting molten resin into the closed mold; A molding step of molding the resin injected in the injection step; A cooling step of cooling the molded article molded in the molding step; An opening step of opening the mold; In the molding method consisting of, in the molding method consisting of, the slide core is provided so as to be slidable in the core between the opening step and the extraction step of the molded article to form one side of the opening and closing handle, And an undercut extraction step of extracting the undercut while being folded into the fold connection part as pushing the shaping surface of the opening and closing handle at the same time as the opening.

According to the present invention implemented by means as described above, undercut extraction of the opening and closing handle is not only possible by the slide core slides at the same time as the opening of the mold, but also minimizes the angle between the lid and the opening and closing handle during molding to induce a smooth folding. It can be effective.

Hereinafter, the technical configuration of a closed container lid mold according to the present invention will be described in detail according to the accompanying drawings.

As shown in Figure 1, the outer peripheral surface of the lid 20 formed by the present invention is connected to a plurality of opening and closing handles 22 by the folding connection portion 26, the opening and closing handle 22, the locking projection 24 ) Is formed to protrude and is coupled to the locking groove 14 formed as the outer circumferential surface of the opening part 12 of the container 10, thereby sealing the opening part 12 of the container 10.

As shown in an enlarged view at the top of FIG. 2, the locking protrusion 24 of the opening and closing handle 22 extending horizontally protrudes into the lid 20, and the locking protrusion 24 is centered on the folded connection part 26. By folding the opening and closing handle 22 downwards, it is elastically coupled to the locking groove 14.

The above-described lid 20 is formed by a mold consisting of a core 120 and a cavity 220, as shown in Figure 3, the core 120 is installed on the fixed side plate 110 and the cavity 220 is The molten resin is injected into the movable side plate 210 through the runner 230. And the core 120 is formed to shape the bottom of the lid 20, the cavity 220 is formed to form the top surface of the lid 20.

4A illustrates the front of the core 120, a plurality of slide grooves 122 are formed in the core 120, as shown in FIG. 3, in the opening and closing handle 22 of the lid 20. A slide core 124 is slidably mounted to the slide groove 122 to form one surface of the bottom surface of the opening / closing handle 22. The slide core 124 includes a locking protrusion 24 of the opening / closing handle 22. The shaping surface 124a is formed to shape the outer portion except for the above.

The slide core 124 is supported by the slide groove 122 by the elastic member 126 to elastically push the molding surface 124a of the opening and closing handle 22 at the same time as the opening of the mold, the elastic member 126 3 is preferably implemented as a coil spring as shown in Figure 3, it is apparent to those skilled in the art that may be optionally implemented as a leaf spring. And the elastic member 126 is preferably supported on both sides of the rear surface of the slide core 124 as shown in Figures 4a and 4b. The accommodating groove 122a is formed in the slide groove 122 of the core 120 to accommodate the elastic member 126 to prevent the elastic member 126 from being separated. In addition, guide bars 124b are formed on both sides of the rear surface of the slide core 124 so as to slide to the inner diameter of the coil spring implemented by the elastic member 126, whereby the slide core 124 flows in all directions when the slide core 124 is slid. Is prevented.

In addition, referring to FIG. 4B, stoppers 124c are formed at both sides of the rear surface of the slide core 124 to prevent separation from the slide groove 122 in which the slide core 124 is mounted.

FIG. 5 illustrates one surface of the cavity 220 corresponding to the core 120. In the cavity 220, an accommodation groove 224 is formed to accommodate the slide core 124 described above. The contact surface 224a is formed in contact with the outer end of the slide core 124, the slide core 124 in contact with the contact surface 224a is formed to form a portion of the bottom of the opening and closing handle 22 ( 124a).

Looking at the overall operating relationship of the mold structure according to the invention configured as described above with reference to Figures 6a to 6e.

First, when the movable side plate 210 is operated in the state in which the core 120 and the cavity 220 are opened as shown in FIG. 6A, the cavity 220 is moved in the arrow direction as shown in FIG. 120 and the cavity 220 is closed, wherein the slide core 124 is slid into the slide groove 122 while contacting the contact surface 224a of the cavity 220 to form a part of the bottom of the opening and closing handle 22. The molding surface 124a is formed to be formed.

Subsequently, when the molten resin is injected through the runner 230 as shown in FIG. 6C, the molding M is molded and cooled at an appropriate temperature. When the movable side plate 210 is moved in the direction of the arrow as shown in FIG. 6D, the core 120 and the cavity 220 are opened, and the slide core 124 elastically supported by the elastic member 126 is opened and closed. The bottom of the handle 22 is pushed, at which time the opening and closing handle 22 is folded to the folding connection 26 as shown in FIG. 6d to allow extraction of the undercut.

Here, when the bottom surface of the lid 20 is a horizontal line and the vertical virtual line H is a dotted line, the angle Θ between the bottom line of the vertical virtual line H and the opening / closing handle 22 is approximately as shown in FIG. 7. 90 ° to 100 °, and the angle Θ is possible as the slide core 124 pushes the bottom of the opening / closing handle 22 at the same time as the mold is opened. This is because) can be folded and the undercut can be extracted.

That is, since the angle between the bottom of the lid 20 and the opening and closing handle 22 according to the present invention Θ is made smaller than the conventional angle between the folding connection portion 26 also becomes smaller between the opening angle, When the 22 is folded into the folded connection part 26, the opening and closing can be performed more smoothly than before, and the breakage of the folding connection part 26 is prevented by the sharp deformation angle and repeated use.

Finally, as shown in FIG. 6E, the molded article M may be completely extracted by pushing the eject pin 130.

Accordingly, the undercut is made while the slide core 124 pushes the bottom of the opening / closing handle 22 simultaneously with opening of the mold, thereby reducing the angle Θ between the bottom of the lid 20 and the opening / closing handle 22. Therefore, the present invention prevents the phenomenon that the folding and breaking of the soft locking blades are promoted as the angle increases while the hook is vertically formed and the locking blades are inclined to extract the undercut as in the related art.

In addition, in the prior art to prevent the formation of the pin mark generated by hitting the one side of the lock wing with an inclined eject pin for extracting the undercut is to form a beautiful lid.

Looking at the molding method of the lid 20 described above with reference to the accompanying Figure 8, the closing step (S10) for closing the mold consisting of the core 120 and the cavity 220, injecting the molten resin into the closed mold Injection step (S20), molding step of molding the injected resin (S30) and cooling cooling step (S40), opening step of opening the mold (S50), opening and closing handle 22 with the slide core 124 at the same time opening Undercut extraction step (S60) for extracting the undercut by pushing the bottom surface, and the molded article extraction step (S70) for extracting by pushing the molded article (M) extracted undercut to the eject pin (130).

In the closing step S10, as the core 120 and the cavity 220 are in contact with each other as the movable side plate 210 moves as shown in FIG. 6B, the mold is closed and precisely closed and melted so that a tantang line does not occur. It is important to maintain an appropriate mold clamping force so that the resin will not open when injected.

In the injection step S20, the molten resin is injected through the runner 230 into the closed mold.

In the molding step (S30), after molding the injected resin for a predetermined time, the molded article is formed through a suitable cooling temperature in the cooling step (S40).

In addition, the undercut extraction step S60 is immediately followed by an opening step S50 in which the core 120 and the cavity 220 are opened according to the operation of the movable side plate 210. In the undercut extraction step S60, At the same time as the slide core 124 elastically pushes the bottom of the opening and closing handle 22 is folded to the folding connection 26 is to extract the undercut. Here, the slide core 124 is supported by the elastic member 126 as described above and slides along the slide groove 122.

Finally, the molded article M is extracted by pushing one side of the molded article M with the eject pin 130 by the molded article extraction step S70.

The above description is merely to describe one preferred embodiment according to the present invention, it will be apparent to those skilled in the art that the present invention is not limited to the above-described embodiment can be carried out in various modifications within the appended claims.

1 is an exploded perspective view of the container and the lid disassembled according to an embodiment of the present invention.

Figure 2 is a combined cross-sectional view of the container and the lid coupled to the embodiment of the present invention.

3 is a cross-sectional view of a mold according to an embodiment of the present invention.

4A and 4B are front and sectional views taken along line A-A of the core according to the embodiment of the present invention.

5 is a front view of a cavity according to an embodiment of the present invention.

6a to 6e is an operation of the core and cavity according to an embodiment of the present invention.

7 is a cross-sectional view of the lid extracted with a mold according to an embodiment of the present invention.

8 is a block diagram showing a molding step according to an embodiment of the present invention.

♠ Explanation of symbols on the main parts of the drawing ♠

10 container 20 lid

22: opening and closing handle 24: locking projection

26: folding connection 120: core

122: slide groove 124: slide core

126: elastic member 220: cavity

Claims (6)

In a mold consisting of a core and a cavity for forming a lid connected by a folding connection, the opening and closing handle having an undercut to be coupled to the locking groove of the container, The core has a slide core and a slide core which elastically pushes the forming surface so that the undercut can be extracted while the mold is opened while the mold is opened while forming at least one surface of the handle and the mold is opened. With a slide groove, The slide groove mold container for a lid, characterized in that the elastic member is mounted to elastically support the slide core. The method according to claim 1, The elastic member is a container lid mold, characterized in that consisting of a coil spring. The method according to claim 2, The slide groove mold container for a lid, characterized in that the receiving groove is formed so that the coil spring is received. The method according to claim 3, The slide core has a mold for a container lid, characterized in that the guide bar is formed to guide the sliding to the inner diameter of the coil spring. The method according to claim 1, The slide core is a mold for a container lid, characterized in that the stopper is provided to prevent the departure from the slide groove. A closing step of closing a mold formed of a core and a cavity formed to form a lid connected to a folding connection by an opening / closing handle having an undercut to be coupled to the locking groove of the container; Injecting molten resin into the closed mold; A molding step of molding the resin injected in the injection step; A cooling step of cooling the molded article molded in the molding step; An opening step of opening the mold; In the molding method comprising a molded article extraction step of extracting by pressing the molded article with an eject pin; Between the opening step and the extraction step of the molded article, the slide core is slidably provided in the core to form one surface of the opening / closing handle, and the undercut is folded to the folding connection part as the opening of the mold pushes the molding surface of the opening / closing handle. Molding method of the container lid comprising the undercut extraction step of extraction.

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