JP2003089147A - Method for molding container with hanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for molding a container with a hanger enhancing productivity even if the hanger and the container are monolithically molded, capable of utilizing an existing production line and high in the degree of freedom of the shape of the hanger. SOLUTION: The method for molding the container with the hanger includes a process for injection-molding a preform 1 constituted so that an extension part 4 also used as a resin flow channel and later forming the hanger is provided to the bottom 3 of a bottomed cylindrical body 2, a process for subjecting the preform 1 to biaxial stretch blow molding to mold the same into the container, a process for forming the extension part 4 into the hanger at the time of either one of the preform 1 and the container, and a process for applying a fold to the hanger. Since the extension part 4 later becoming the hanger is the resin flow channel, it is unnecessary to open a split mold in a horizontal direction in the injection molding process of the preform 1 and, thereafter, the extension part 4 is formed into the hanger at the time of either one of the preform 1 and the container, and a perforation and the fold are subsequently formed to the hanger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a container with a hanging tool used for a drip container or the like, and more specifically,
A step of injection-molding a preform having an extension for the hanging tool, a step of molding the preform into a container, a step of forming the extension of the preform in the hanging tool, and a hole in the hanging tool. The present invention relates to a method for forming a container with a hanging tool, including the steps of opening and creasing.

[0002]

2. Description of the Related Art Since a container with a hanging device of this kind is often used for medical purposes such as a drip container, the reliability of the hanging device is considered important. From the viewpoint of stability, it is preferable to form the hanger integrally with the container rather than attaching it. Such an idea has been known from the past, for example, a tubular body with a bottom, a ring-shaped suspender having a hole in the center, and a cross section connecting these suspenders and the bottom wall of the trunk. A step of injection-molding a preform integrally having a substantially circular connecting portion, a step of biaxially stretch blow molding this preform to form a container with a hanger, and a step of a preform and a container with a hanger. A method of forming a container with a hanging tool including a step of compressing the connecting portion in any state to form a hinge portion is known (see Japanese Patent Publication No. 6-84038).

According to this method, a container having less uneven thickness can be molded, and since the hinge portion is formed later, the connecting portion which is the gate portion of the resin flow does not suppress the resin flow,
Molding defects can be eliminated and yield can be improved,
Further, since the hanging tool is formed integrally with the container, the hanging tool is highly reliable and a container with a hanging tool excellent as a medical device can be manufactured.

[0004]

However, in the above method for forming a container with a hanging tool, since the hole of the hanging tool is also molded at the time of injection molding of the preform, the hanging tool forming cavity mold can be opened and closed horizontally. As such, it is necessary to have a two split configuration. Therefore, the preform injection molding line needs a space for horizontally opening and closing the two mold halves for the lifting device molding cavity, and the preform injection molding line is largely regulated. There is a problem that Especially when using an existing preform injection molding line,
It is possible that this method of forming a container with a hanging tool cannot be used, and in this case, the production plan must be changed significantly.

In addition, in the method of molding a container with a hanging tool, since the hanging tool serves as a resin flow passage as it is, it can be said that the resin flows through the connecting portion to the body portion which constitutes the container.
This greatly imposes a restriction on the shape of the hanging tool, and the degree of freedom in designing the shape of the hanging tool decreases accordingly.

Therefore, the object of the present invention is to improve the productivity of preforms and facilitate the use of existing production lines, while the hanging tool and the container are integrally molded, and the shape of the hanging tool is also improved. An object of the present invention is to provide a method for forming a container with a hanging tool that can ensure the degree of freedom in design.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and is characterized by the following constitution. That is, according to the present invention, a step of injection-molding a preform having a resin extending portion at the bottom of a bottomed tubular body, and a step of biaxially stretch blow-molding the preform to form a container. And a step of forming the extending portion of the container bottom on the suspender, and a step of creasing the suspender, the method for forming a container with a suspender is provided.

Further, according to the present invention, in the container forming step, a stretch rod is inserted into the preform, and a press rod having a housing groove at a tip end is brought close to the bottom of the preform from the outside. A method of forming the container with a hanging tool is provided, in which the extending portion is housed in the housing groove, and the stretch rod and the press rod cooperate to stretch the preform in the axial direction thereof.

Further, according to the present invention, in the container forming step, the clipping mechanism provided at the tip of the press rod sandwiches the extending portion of the preform to form a suspender on the preform. A method for forming a container with a tool is provided.

Further, according to the present invention, a clipping mechanism is provided in the base insert in the container molding step,
There is provided a method for forming a container with a hanging tool, wherein a hanging tool is created at the bottom of the preform and the bottom of the container by the clipping mechanism either during or after the biaxial stretch blow molding of the preform.

Further, according to the present invention, a step of injection molding a bottomed tubular preform and a container having a convex portion projecting outward on the bottom by biaxially stretch blow molding the preform. A container with a hanging tool, which includes a step of forming, a step of forming a convex portion of the container after release on a hanging tool, and a step of punching and creasing the hanging tool. A molding method is provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the method of the present invention will be described below with reference to the drawings. The method for molding a container with a hanging tool of the present invention is a step of injection molding a preform having a bottom portion of a bottomed tubular body that also serves as a resin flow passage and has an extending portion to be formed later in the hanging tool (hereinafter, Called injection molding process) A,
A step (hereinafter referred to as a container molding step) B of biaxially stretch-blow molding this preform (hereinafter referred to as a container molding step), and a step of forming an extension portion on a suspender at any one of these preform and container ( Hereinafter, referred to as a hanger forming step) C,
A step D of making a hole and making a crease in the hanger (hereinafter referred to as a hole making crease making step) D.

As shown in FIGS. 1 to 3, the preform 1 in the injection molding step A has a bottom portion 3 of a bottomed cylindrical body 2 having a mouth portion 7 with a flange 6, and also serves as a resin gate and a flow passage. In addition, it has a tongue-shaped extending portion 4 that will later form the hanging 31. The reason why the extending portion 4 has a tongue-like shape is that it is convenient for processing the hanging tool 31 thereafter. The shape of this preform 1 has only the mouth portion 7 with the flange 6 of the container 5 with a hanging tool which is the final product, and further has the tongue-shaped extending portion 4 which later forms the hanging tool 31. Is.

The preform 1 having such a shape is shown in FIG.
It is injection-molded with a simple mold structure as shown in. That is, in the injection molding process A, the opening die 10 that regulates the outside of the opening 7 with the flange 6 of the preform 1 and the bottomed tubular body 2 are used.
And an injection cavity mold 11 that regulates the outside of the tongue-shaped extending portion 4, and a core mold 12 that regulates the inside of the preform 1.
And the hot liner 13 serving as an inlet for filling the resin, the resin is filled from the hot liner 13, the resin passes through the tongue-shaped extending portion 4, and rises from the bottom 3 of the bottomed cylindrical body 2. While forming the side wall of the bottomed cylindrical body 2, it finally reaches the mouth portion 7 with the flange 6 and forms these.

The structure of the extension 4 at the time of injection molding of the preform 1 is not particularly limited except that it also serves as a resin flow passage, and as described above, the tongue-shaped extension 4 is provided.
No special mold for injection molding, especially a mold that opens and closes in the horizontal direction is required. For this reason, unlike the conventional example, there is no need for a space for horizontally opening and closing the two split molds for the hanging device cavity mold, and the preform injection molding line is not largely restricted, resulting in a decrease in productivity. There is nothing to do.

Further, the preform 1 may have a shape as shown in FIGS. The preform 1a shown in FIG. 5 has an inverted truncated cone-shaped extension 4a. This extension 4a is most convenient for a resin gate and a flow passage, but is processed as a hanging tool 31a. Is inferior to the tongue-shaped one. Preform 1b of FIG. 6
Is a small bottomed cylindrical extension 4b,
The extending portion 4b having this shape is convenient as a resin gate and a flow passage, and is also relatively convenient for being processed as the hanging tool 31b. Since the preform 1a of FIG. 5 and the preform 1b of FIG. 6 are substantially the same as the preform 1 shown in FIGS. 1 to 3, other configurations and actions are denoted by reference numerals in the drawings, and description thereof will be omitted.

The preforms 1, 1a, 1b injection-molded as described above are sent to the container molding step B and molded into containers with the above-mentioned extending portions 4, 4a, 4b. That is,
In the case of the preform 1, the preform 1 is mounted in a biaxial stretch blow mold (not shown), and a stretch rod (not shown) is lifted and inserted into the preform 1, and as shown in FIGS. The press rod 21 having the housing groove 20 at the tip is lowered to the bottom portion 3 of the preform 1 and brought closer to the outside, and the tongue-shaped extending portion 4 is housed in the housing groove 20. As a result, the stretch rod and the press rod 21 cooperate with each other so that the preform 1 rises in the axial direction and is stretched. At the same time as or after the stretching in the axial direction is finished, air is blown into the preform 1. And stretched in the radial direction, and blow molded into a container with the extension 4. The two-dot chain line in FIGS. 7 and 8 indicates a container.

Similarly, in the case of the preforms 1a and 1b, the preforms 1a and 1b are mounted in a biaxial stretch blow mold (not shown), and a stretch rod (not shown) is inserted into the preforms 1a and 1b by raising them. To do. Then, as shown in FIGS. 10 and 11, the extending portion 4b (4) of the preform 1b (1a) is
In a), the press rod 23 having the clipping mechanism 22 at its tip is used because it is wide and cannot be accommodated in the accommodation groove 20. In this clipping mechanism 22, a T-shaped tip 25 of a rod 24, a boomerang-shaped holding piece 26 pivotally supporting a central portion, and a T-shaped tip 25 and one end of the holding piece 26 are rotatable by a link 27. Connected and further clamped piece 2
At the other end of 6, a hanger creation recess 28 is formed.

The press rod 23 having the clipping mechanism 22 having such a structure is lowered to bring it closer from the outside,
The extension portions 4a, 4b of the preforms 1a, 1b are sandwiched by the clipping mechanism 22, and the preforms 1a, 1b are raised and stretched in the axial direction in cooperation with the stretch rod and the press rod 23. Simultaneously with or after the axial stretching is completed, the preforms 1a, 1b
Air is blown into the container to be stretched in the radial direction and blow molded into a container. Therefore, such a clipping mechanism 2
If the press rod 23 having 2 is used, the preform 1a, the preform 1a,
If 1b can be stretched in the axial direction and air is blown, the extended portion 4,
It can be molded into a container with 4a and 4b.

In the case of the preforms 1a and 1b, the press rod 23 is lowered and the clipping mechanism 22 is used to extend the extension parts 4a and 4b of the preforms 1a and 1b.
It is also possible to have a shape in which the tongue-shaped extending portion 4 of the preform 1 is made to approach at the same time while the container forming step B is being performed when sandwiching. That is, the preforms 1a and 1b are in a heated state because the container forming step B is in progress, and when the extension portions 4a and 4b are sandwiched by the clipping mechanism 22, the preform 1 is extended by the hanging tool creation recess 28. It can be formed in a tongue shape having substantially the same shape as the projecting portion 4. Further, by changing the shape of the hanger creation recess 28 of the clipping mechanism 22 in various ways, it is possible to obtain extension parts of various shapes.

In the container forming step B, when the preform is formed into a container, the clipping mechanism 36 (FIG. 12, FIG. 12,) similar to the above is attached to the base insert 35 in the biaxial stretching blow mold (not shown). 13) may be provided, and the hanging member 37 may be formed on the bottom of the preform and the bottom of the container by the clipping mechanism 36 either during or after the biaxial stretch blow molding of the preform. Therefore,
By using such a base insert 35, it is possible to create a portion to be an extension portion during molding of the container, use that portion as a hanging tool, and mold it integrally with the container.

As described above, the container having the extending portions 4, 4a, 4b formed in the container forming step B is sent to the hanging tool forming step C, and the tongue-like extending portions 4, 4a, A hole 30 for hanging on a hanger is opened in 4b (see FIG. 14), and the extending portions 4, 4a, 4b become hanging tools 31, 31a, 31b, and the hanging tool container 5.

Further, the container 5 with a hanging tool, in which the hole 30 has been opened in the hanging tool forming step C, is sent to the folding step D, and the folding tool 31 (31a, 31b) is provided with a fold 32, as shown in FIG. A container 5 with a hanging tool as shown in 16 is completed. The container 5 with hanging tool is filled with medicines, nutrients and the like from the mouth portion 7, and the mouth portion 7 is provided with a stopper (not shown).
Is further sealed, and the suspending tool 31 is further folded along the fold line 32, and is stored in the recess 34 of the bottom 33 of the suspending tool-equipped container 5,
It is put in a packaging bag in that state, and becomes a container for administration of enteral nutrients for medical use. When using, attach the hanger 30 to the hole 30 of the hanger 31.
The container 5 is hung upside down through the container, and the stopper of the mouth 7 is pierced with an injection needle to drip a drug or the like onto the patient. At this time, since the hanging tool 31 is formed integrally with the bottomed tubular body 2 of the preform 1, there is little risk of detachment, and safety is high for medical use.

The above preforms 1, 1a, 1b
The material forming the (container 5 with hanging tool) is not particularly limited, but polyethylene terephthalate, polyester resin such as copolyester, polypropylene, etc. are appropriately adopted.

17 and 18 show another embodiment of the present invention. This container 5a with a hanging tool and FIGS.
The difference from the sixth embodiment is that the container portion is first biaxially stretch-blow molded using a preform without any of the extending portions 4, 4a, and 4b, and then the bottom portion of the container portion is used as a hanging tool. There is a point to form.

That is, the method for forming the container with the hanging tool comprises a step A'injecting a preform having a bottomed tubular shape and a bottom 40 by biaxially stretch blow molding the preform.
Step B ′ of molding into a container 42 having a convex portion 41 projecting outwardly, and the convex portion 41 of the container 42 with the hanger 31 (FIG. 14).
C), and a step D ′ in which a hole 30 is opened in the suspender 31 and a fold 32 (see FIG. 14) is further formed.
Is included. Therefore, even with this method of forming a container with a hanging tool, there is no extending portion that will later become the hanging tool 31 in the injection molding step A ′ of the preform, so there is no need to open the split mold in the horizontal direction. There is no need for space, and the injection molding line for preforms is no longer greatly restricted, and productivity is not reduced.

Although the embodiment of the present invention has been described above, it is to be understood that the specific configuration is not limited to this, and changes and additions can be made without departing from the scope of the present invention. is there.

[0028]

As described in detail above, according to the present invention,
Since the extension that will later become a suspender is a resin flow path, it is not necessary to open the split mold in the horizontal direction during the preform injection molding process, and the extension is then opened when either the preform or the container is used. It can be formed into a sling and then perforated and creased in the sling. Therefore, although the sling and the container are integrally molded, the productivity of the preform is increased, the existing production line is easily used, and the flexibility of the shape design of the sling is secured. There is an effect that becomes possible. Further, even if the preform has an extending portion that serves as a suspender in the injection molding process of the preform, if the stretch rod and the press rod can be stretched in the axial direction in cooperation with the extending portion, there is an extending portion. However, biaxial stretch blow molding can be done without any problems as before.
The above effect can be secured. Further, the preform is stretched in the axial direction by the stretching rod and the press rod in cooperation with each other by sandwiching the extension portion by the clipping mechanism without being restricted by the shape of the extension portion which becomes the suspension in the preform injection molding process. In addition, in the case where the extending portion is formed on the suspender by the clipping mechanism, in addition to the above effects, the biaxial stretch blow molding can be performed without any trouble as before without being restricted by the shape of the extending portion, Moreover, there is an effect that the extending portion can be formed on the hanging tool during the biaxial stretch blow molding. Further, when the clipping mechanism provided in the base insert is opened, the preform is biaxially stretch blow-molded into the container, and the clipping mechanism is closed midway and immediately after the completion, and when the suspension is formed, the above effect is obtained. In addition, regardless of the presence or absence of the extending portion, there is an effect that biaxial stretch blow molding can be performed to form the suspending tool midway and immediately after the completion. Furthermore, in the injection molding process of the preform, there is no extension to be a hanging tool later, so it is not necessary to open the split mold in the horizontal direction.After that, the preform is biaxially stretch blow molded into a container, and in that process By forming a convex portion projecting outward on the bottom of the container and forming the convex portion of the container after release on the suspending tool, and then making a hole and crease in the suspending tool, the extending portion is formed. Even if it is not necessary, if the shape of the bottom of the container is made convex, the hanging tool and the container can be integrally molded, which improves the productivity of the preform and facilitates the use of the existing production line. In addition, it is possible to secure the degree of freedom in designing the shape of the hanging device.

[Brief description of drawings]

FIG. 1 is a front view of a preform showing an embodiment of the present invention.

FIG. 2 is a side view of the preform showing the embodiment of the present invention.

FIG. 3 is a bottom view of the preform showing the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a preform injection molding process showing an embodiment of the present invention.

FIG. 5 is a front view of a preform showing another embodiment of the present invention.

FIG. 6 is a front view of a preform showing another embodiment of the present invention.

FIG. 7 is a side view showing the operating state of the press rod during the container molding process according to the embodiment of the present invention.

FIG. 8 is a plan view showing the shape of the press rod during the container forming process according to the embodiment of the present invention. .

FIG. 9 is a side view showing the operating state of the press rod during the container molding process according to the embodiment of the present invention.

FIG. 10 is a side view showing an operation state of another press rod during the container molding process according to the embodiment of the present invention.

FIG. 11 is a side view showing an operating state of another press rod during the container molding process according to the embodiment of the present invention.

FIG. 12 is a side view showing the operating state of the base insert during the container molding process according to the embodiment of the present invention.

FIG. 13 is a side view showing an operating state of the base insert during the container molding process according to the embodiment of the present invention.

FIG. 14 is a front view of the container with hanging tool according to the embodiment of the present invention.

FIG. 15 is a side view of the container with hanging tool according to the embodiment of the present invention.

FIG. 16 is a bottom view of the container with hanging tool according to the embodiment of the present invention.

FIG. 17 is a front view showing the container during the container forming process of another embodiment of the present invention.

FIG. 18 is a side view showing a container during a container forming step according to another embodiment of the present invention.

[Explanation of symbols]

1,1a, 1b preform 2 Bottomed cylinder 3,33,40 bottom 4,4a, 4b Extension part 5 Container with hanging equipment 6 flange 7 mouth 10 mouth type 11 injection cavity type 12 core type 13 hot liner 20 storage groove 21 Press rod 22,36 Clipping mechanism 23 Press rod 24 rod 25 T-shaped tip 26 Clips 27 links 28 Hanging device creation depression 30 holes 31, 31a, 31b, 37 Hanging tool 32 folds 34 hollow 35 base insert 41 convex 42 containers

Continued front page    F-term (reference) 4F202 AG07 AH55 CA15 CB01 CK11                 4F208 AG07 AH55 LA02 LA05 LA08                       LB01 LG01 LG03 LG15 LG19                       LG29 LG34 LG40 LN23 LW21                       LW25

Claims (5)

[Claims] 1. A step of injection-molding a preform having a resin extending portion on the bottom of a bottomed cylindrical body, and a step of biaxially stretch blow-molding the preform into a container.
A method of forming a container with a hanging tool, comprising: a step of forming the extending portion of the bottom of the container into a hanging tool; and a step of creasing the hanging tool. 2. In the step of molding the container, a stretch rod is inserted into the preform, and a press rod having a housing groove at the tip is brought close to the bottom of the preform from outside to house the extending portion. Housed in a ditch,
The method for forming a container with a hanging tool according to claim 1, wherein the preform is stretched in the axial direction thereof in cooperation with the stretch rod and the press rod. 3. The hanging tool according to claim 1, wherein in the container forming step, a hanging mechanism is formed on the preform by sandwiching an extending portion of the preform by a clipping mechanism provided at a tip of the press rod. Molding method for containers. 4. A clipping mechanism is provided on the base insert in the container molding step, and the preform is hung on the bottom of the preform and the bottom of the container by the clipping mechanism either during or after biaxial stretch blow molding. The method for forming a hanging tool according to claim 1, wherein a tool is created. 5. A step of injection-molding a bottomed tubular preform, a step of biaxially stretch blow molding the preform into a container having a convex portion projecting outward at the bottom, and A method for forming a container with a hanging tool, comprising: a step of forming a convex portion of the container after molding on a hanging tool; and a step of making a hole and making a crease in the hanging tool.