JPH08324621A - Container pull top device - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the operability of the handle part while maintaining the connecting strength of the handle part in the container pull-top device, and to improve the productivity of the product in injection molding and reduce the defective rate. . [Structure] On the bottom wall 6 of the container 2 made of synthetic resin,
A weakening line 8 is provided along the outer peripheral edge of the bottom wall, and a handle portion 10 formed in a substantially ring shape with a size for loosely inserting a finger is connected to the outer surface of the bottom wall 6 near the inside of the weakening line 8. The pull-top device 4 of the confinement container 2 in which a part of the bottom wall 6 is removed along the weakening line 8 by pulling the handle portion 10. The handle portion 10 is connected via two columns 12 and 12, and the handle portion 10 is connected to one of the columns 12.
While one end of the handle portion 10 is connected, the other end of the handle portion 10 is connected to the other column 12.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a container pull-top device.

[0002]

2. Description of the Related Art Conventionally, a container having a pull-top device at its opening has been widely known (for example, JP-A-6-255).
664 publication). An example of a conventional pull-top device is shown in FIG. This pull-top device forms a weakening line b in a circular shape or a rectangular shape in a groove or the like on a synthetic resin wall a of a container opened as a pouring port or a taking-out port for contents, and from the weakening line b Also, a ring-shaped handle portion d is connected to the inner portion via a column c.

When the wall a is opened, the handle d
By inserting a finger into the handle, raising the handle portion d in the direction indicated by the symbol e to incline it, and further pulling the handle portion d in the direction indicated by the symbol f, a part of the wall portion a is removed along the weakening line b. except. The ring-shaped handle portion d has an inner diameter large enough to allow a finger to be loosely fitted.

Further, as shown in FIG. 8 (a), the handle portion d
A peripheral wall g for guiding the contents may be provided around the. This container h is a kudzu set (for example,
No. 134948), which has a pull-up device on one end side and a film on the other end side. Then, in order to procure the peripheral wall g, the handle portion d in the form of a strip, the column c, and the wall portion (bottom wall) a as an integrated product of injection molding, the middle frame (floating member) inserted in the handle portion d Molding is also performed using i).

The mold release of this product at the time of injection molding is generally performed by the following procedure. First, as shown in FIG. 8A, the middle piece i is slid in the direction of and removed. Then, the cavity mold k is removed in the direction of with the product attached to the core j. Then, the stripper plate m presses the lower end of the product to pull out the core mold j. As shown in FIG. 8B, the lower end of the handle part d with respect to the cavity mold k is undercut, so that the outer periphery of the lower end part of the handle part d can be released. A tapered undercut portion d1 is formed on the surface.

[0006]

The conventional pull-top device has the following problems. In the above-mentioned conventional pull-top device, it is necessary to connect the handle part d with a predetermined strength by thickening the support column c so that the handle part d does not break from the wall part a when pulling the handle part d. Is.
However, if the support pillar c is made thicker, the support pillar c is less likely to be deformed by that amount.
When lifting up, the inclination angle of the handle part d cannot be taken sufficiently,
This causes a problem that the handle part d is difficult to operate.

Further, in the case of the pull-top device shown in FIGS. 8A and 8B, when the cavity mold k is removed after removing the middle frame i, the undercut portion d1 enables the mold release. However, it is unavoidable that the product is forced to be removed, which may affect productivity. Further, since the undercut portion d1 has an extremely slanted shape, the lower end portion of the handle portion d has a small thickness, which is disadvantageous in filling the material during molding. Therefore, in such an integrally molded product, there has been a strong demand for a pull-top device capable of improving the productivity and the defect rate of the product in injection molding.

The present invention has been made in view of the above-mentioned problems of the prior art, and improves the operability of the handle portion while maintaining the connecting strength of the handle portion, and further improves the productivity of products in injection molding and It is an object of the present invention to provide a container pull-top device that realizes a reduction in the defective rate.

[0009]

The present invention has the following configuration to achieve the above object. That is, the invention of claim 1 is such that a weakening line is provided on a wall portion made of synthetic resin so as to surround a part of the wall portion, and a finger is provided near the inner side of the weakening line on the outer surface of the wall portion. A container having a substantially ring-shaped handle portion that is loosely inserted is connected through a support, and the handle portion is pulled to remove a part of the wall portion along the weakening line and open. In the pull-top device described above, the support column is divided into two support columns that are separated from each other, and one support column is connected to one end of the handle section, and the other support column is connected to the other end of the handle section. It is a pull-top device for a container characterized by that.

According to a second aspect of the present invention, the handle portion is formed in a shape of winding a band, and the wall portion is provided with a peripheral wall surrounding the handle portion outside the weakening line. The handle portion, the peripheral wall, the two columns and the wall portion,
It is integrally molded by injection molding by using a middle piece that is inserted into the handle part and is in contact with the outer surface of the wall part, and the lower end of the handle part is a cavity type after removing the middle piece. The pull-top device for a container according to claim 1, wherein the mold is undercut with respect to the cavity mold.

[0011]

According to the present invention, the support column is composed of two support columns, one support column is connected to one end of the handle portion, and the other support column is connected to the other end of the handle portion. Therefore, as compared with the conventional structure in which one strut is connected, even if the connection strength is set to the same level, the connecting portion (two strut) is easily deformed. For example, when lifting the handle part upwards,
The two columns are deformed so that their back sides are warped, and at the same time, they are also deformed in a direction in which they approach each other, so that the handle portion is more easily tilted. Therefore, the operability of the handle can be improved without impairing the connection strength of the handle.

Further, since the connecting portion becomes flexible, it is not always necessary to tilt the handle portion upward. For example, the handle portion may be pulled horizontally as it is to be opened, and the pulling direction of the handle portion is not limited.

Incidentally, No. 3-66824, No. 5 Shokai
Japanese Patent Application Laid-Open No. 9-106858 discloses a technique of branching a support column or providing a U-shaped groove in the support column. However, in all of these techniques, a finger is used to insert a small handle portion. The purpose of the present invention is to forcibly open the handle part to improve the operability of the handle part, and shows a form in which the two columns come apart (open) from each other when the handle part is operated. On the other hand, according to the present invention, the size of the handle portion is relatively large, and has an effect of deforming the two columns in a direction of approaching (closing) each other.

According to a second aspect of the present invention, the pull-top device is one in which the handle portion, the peripheral wall, the two columns and the wall portion are integrally molded by using the middle piece.
When the lower end of the handle portion is undercut, the following further effects can be obtained. That is, when the cavity mold is removed after the middle frame is removed, the two columns can be deformed in the direction in which they approach each other, so that the outer shape of the handle portion can be reduced. Therefore, the product can be smoothly released from the mold without forcing. Further, since the undercut portion at the lower end of the handle portion can be set to a gentle shape, the lower end of the handle portion can be formed thick and the defective rate can be reduced.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, as shown in FIGS. 1 and 2, the present invention is applied to a kudzu container 2 of a kudzu set. The structure and effect of this kudzu set will be described.

As shown in FIGS. 3 and 4, this kudzu set is installed on the kudzu container 2 having a pull top device 4 on one end side in the longitudinal direction, and on the pull top device 4 side in the kudzu container 2. It is composed of a mesh-like kudzu body 16 and a bottomed cylindrical ejector 20 having a shape insertable into the kudzu container 2 and having a syrup 18 stored therein.

In order to make "Kuzukuri" with this kudzu set, the kudzu container 2 on the side opposite to the pull-top device 4 side is first prepared.
The film 22 attached to the end face of the is peeled off, the pull-top device 4 side is further opened, the projecting tool 20 is inserted into the kudzu container 2 and the kudzu 24 is pressed. When the kudzu 24 is pushed forward by this pressing force and passes through the kudzu body 16, a thick thread-like kudzu is obtained from the opening on the pull top device 4 side. Then, the obtained kudzu is put in a prepared plate or the like, and the film 26 of the protrusion 20 is peeled off, and the syrup 18 therein is put on the kudzu. This gives you the same delicious kudzu as you would eat at a store.

Next, the construction, operation and effect of the container 2 and particularly the pull-top device 4 according to the present invention will be described in detail.

As shown in FIG. 1, the kudzu container 2 is a bottomed tubular synthetic resin molded product procured from polyethylene or the like and having a substantially rectangular cross section. The bottom wall 6 is located slightly behind the container end surface (inward of the container), and around the bottom wall 6,
A substantially rectangular peripheral wall 14 that is higher than the upper end of the handle portion 10 is formed.

The pull-top device 4 is, as shown in FIG.
A weakening line 8 formed in the bottom wall 6 so as to surround the inner peripheral edge of the bottom wall slightly, and two columns 12, 12 that are arranged in parallel in the vicinity of the inner side of the weakening line 8 in the bottom wall 6, It is mainly configured by a substantially ring-shaped handle portion 10 having one end connected to one support 12 and the other end connected to the other support 12. In addition, the handle portion 10, the peripheral wall 14, the two columns 12,
The entire container 2, including 12 and the bottom wall 6, is
The handle part 1 is integrally molded by injection molding using a middle piece that is inserted into the handle part 10 and is in contact with the outer surface of the bottom wall 6 (see FIG. 8).
The lower end of 0 is an undercut for the cavity mold when the cavity mold is released after the middle frame is removed.

As shown in FIG. 2, the weakening line 8 has a peripheral wall 14
Is a groove formed in a substantially rectangular shape along. Two columns 1
2 and 12 are arranged in the vicinity of one corner of the weakening line 8 on both sides with the diagonal line therebetween. These two columns 12,1
A rib 28 is formed at the lower end of the rib 2.
Reference numeral 8 reinforces the root portions of the two columns 12, 12.

The handle portion 10 has a substantially annular shape in a plan view and a band shape in a side view, and is formed by winding a band body in a substantially cylindrical shape. To be precise, the center angle of the support column 12 side is about 90 °. In the range of, the straight shape is substantially along the peripheral wall 14.
Further, the handle portion 10 has an inner diameter D1 of 10 mm or more, preferably 15 mm or more, so that even if the user's finger (shown by an imaginary line in FIG. 2) is inserted into the handle portion 10, the finger and the handle portion 10 are separated from each other. The size is such that voids remain between them.

The operation of this embodiment having the above structure will be described with reference to FIGS. According to the present embodiment, even if the connection strength is set to the same level as the conventional one, the connection portion (two columns 12, 12) is easily deformed. For example, in FIG.
From the state of (a) to the state shown in FIG. 5 (b),
When the handle portion 10 is lifted upward, the two columns 12,
At the same time, the rear surfaces 12 are deformed so that they are warped, and as shown in FIG. 6B, they are also deformed in a direction in which they approach each other by utilizing the gap 30, so that the handle portion 10 becomes easier to tilt. Therefore, the operability of the handle portion 10 can be improved without impairing the connection strength of the handle portion 10.

Further, since the connecting portions (the columns 12 and 12) are highly flexible, it is not necessary to incline the handle portion 10 for operation. That is, the handle portion 10 may be pulled as it is in a substantially horizontal direction to be opened (in this case, the columns 12 and 12 are also deformed toward each other), and the direction in which the handle portion 10 is operated is not limited.

Further, according to this embodiment, when the product is released from the cavity mold after the middle frame is removed in the mold releasing step in the injection molding, the two columns 12 and 12 are deformed so as to approach each other. The outer dimension D2 of the handle portion 10.
(See FIG. 6A) can be reduced in diameter. Thereby, it is possible to smoothly release the mold without forcibly removing it. At the same time, the undercut portion 10a at the lower end of the handle portion 10 (see FIG.
Since it is possible to set (a)) to a gentle shape, it is not necessary to make the shape of the lower end portion of the handle portion 10 thin.

The present embodiment is a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to this embodiment.

[0027]

As described above, according to the present invention, in the container pull-top device, it is possible to improve the operability of the handle portion while maintaining the connecting strength of the handle portion. Further, it is possible to improve the productivity of products in injection molding and reduce the defective rate.

[Brief description of drawings]

FIG. 1 is a perspective view of a kudzu container according to this embodiment.

FIG. 2 is a bottom view of the kudzu container according to the present embodiment.

FIG. 3 is a side view of the ejector according to the present embodiment.

FIG. 4 is a vertical cross-sectional view of a kudzu container according to this embodiment.

5A and 5B are cross-sectional views showing the pull-top device of the present embodiment, where FIG. 5A is a view showing a normal state, and FIG. 5B is a view showing a state of lifting with a finger.

6A and 6B are views showing an arrow X in FIG. 2, in which FIG. 6A is a view showing a normal state of the handle portion, and FIG. 6B is a view showing a state of lifting the handle portion with a finger.

FIG. 7 is a cross-sectional view showing a conventional pull-top device.

FIG. 8A is a cross-sectional view showing the mold structure of the pull-top device, and FIG. 8B is an enlarged cross-sectional view of the part A in FIG. 8A.

[Explanation of symbols]

 2 Kudatsu container (an example of container) 4 Pull top device 6 Bottom wall (corresponding to wall part) 8 Weak line 10 Handle part 12 Strut 14 Perimeter wall

Claims (2)

[Claims] 1. A wall made of synthetic resin is provided with a weakening line so as to surround a part of the wall, and a finger is loosely inserted near the inner side of the weakening line on the outer surface of the wall. In a pull-top device for a container in which a handle portion formed in a substantially ring shape is connected via a support, and a part of the wall portion is removed along the weakening line by pulling the handle portion to open. The pillar is divided into two pillars spaced apart from each other, and one pillar is connected to one end of the handle portion, and the other pillar is connected to the other end of the handle portion. Pull-top device for containers. 2. The handle portion is formed in a shape of winding a strip, and the wall portion is provided with a peripheral wall that surrounds the handle portion outside the weakening line. The handle portion, the peripheral wall The two columns and the wall portion are integrally molded by injection molding by using a middle piece that is inserted into the handle portion and is in contact with the outer surface of the wall portion, and the lower end of the handle portion is 2. The pull-top device for a container according to claim 1, wherein is an undercut with respect to the cavity type when releasing the cavity type after removing the middle frame.