JP2000094499A - Preform with handle, its molding method, container with handle and its molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a preform with a handle free from short shots on its neck, also manufacture a container with a handle and provide molding methods for them. SOLUTION: A handle section 120 molded integrally on a neck section 112 of a preform main body 110 is provided with a base section 122 extended horizontally from the neck section 112 to sideways, a hollow ring section 124 extended horizontally sideways further than the base section 122 and provided with a hollow area 125 on its center and a connecting section 126 formed from the base section 122 across the hollow area 125 of the hollow ring section 124 and connecting the side of a free end 124A of the hollow ring section 124 with the base section 122.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preform having a handle at a neck, a method of molding the same, a container with a handle and a method of molding the same.

[0002]

BACKGROUND OF THE INVENTION The applicant of the present invention has disclosed a preform and a container having a handle portion in Japanese Patent Application Laid-Open No. H10-11378.

In this preform with a handle, a hollow ring portion is formed integrally with the neck portion as a handle.

Here, in the injection molding of a normal preform, since the resin is filled from one location of the bottom of the preform, the resin reaches the neck portion at the latest. In particular,
In the case of a preform with a handle, the resin flow path of the handle extending from one side surface of the neck portion to the side is bent, so that the resin is less likely to flow than the neck portion.

[0005] Further, in the hollow ring portion of the handle portion, the resin path further branches and flows along the ring portion, so that the resin becomes more difficult to flow.

[0006] Depending on the selection of the resin and the state of plasticization, a short shot may occur, which lowers the mechanical strength of the handle portion and reduces the commercial value.

[0007] For this reason, the injection pressure must be increased more than when injection molding a normal preform.

In view of the above, it has been attempted to provide a large number of air vents in communication with the cavity forming the hollow ring portion, and to escape the air in the cavity pushed out by the resin by the air vent to improve the flow of the resin.

However, when a large number of air vents are provided, burrs are liable to be formed in the hollow ring portion, and this phenomenon becomes more remarkable as the injection pressure is increased, and the commercial value of the preform and, consequently, the commercial value of the container with a handle formed therefrom. Significantly lowers.

[0010] As another object, this kind of container with a handle is usually a large container having a capacity of, for example, 8 liters. When the container is filled with contents and the handle is gripped and lifted, a hollow ring at the handle portion is formed. There was also a problem that the part could not bear the weight and was deformed.

An object of the present invention is to provide a preform having a handle without short shot or deformation, a method for molding the same, a container with a handle, and a method for molding the same.

It is another object of the present invention to provide a preform having a handle without paris, a method for molding the same, a container with a handle, and a method for molding the same.

[0013]

According to a first aspect of the present invention, there is provided a preform with a handle, comprising: a preform main body having a neck portion, a body portion extending below the neck portion, and a bottom portion closing a lower end of the body portion; A handle portion formed on the neck portion of the reforming main body, wherein the handle portion extends toward the side from the neck portion, and further extends toward the side from the base portion, and at the center. A hollow ring portion having a hollow region, and a connecting portion formed from the base portion across the hollow region of the hollow ring portion and connecting a free end side of the hollow ring portion and the base portion. It is characterized by.

According to a fourth aspect of the present invention, a container with a handle is formed by using the preform with a handle of the first aspect. In this case, the structure of the handle is the same as that of the first aspect. .

According to a fifth aspect of the present invention, there is provided a molding method for molding the preform according to the first aspect, wherein a neck cavity mold for defining an outer wall of the neck portion of the preform main body, and the body of the preform main body are formed. An injection cavity mold that defines the outer wall of the part and the bottom, and an injection core mold that defines the inner wall of the preform are clamped to form the preform body molding cavity, and the preform body molding Forming a handle portion forming cavity communicating with the preform main body, and filling the preform main body forming cavity with a molding resin material from a position facing the bottom of the preform main body. Injection molding, and via the preform body forming cavity, the neck portion forming cavity Injecting the shaped resin material, and injection-molding the handle portion. In the injection-molding step of the handle portion, the molding resin material is branched in three directions from a region opposed to the base portion, The hollow ring portion and the connecting portion are injection-molded.

According to a sixth aspect of the present invention, there is defined blow molding for molding a container with a handle using a preform with a handle formed by the method of the fifth aspect.

According to the first, fourth, fifth and sixth aspects of the present invention, as described in the fourth aspect, a resin path for molding the hollow ring portion is ensured on three sides by the presence of the connecting portion. Therefore, a short shot in the hollow ring portion is prevented. Preventing this short shot not only increases the mechanical strength of the hollow ring portion but also reinforces the connecting portion, so that a handle with little deformation can be obtained. Since the flow of the resin becomes good in this manner, it is not necessary to excessively increase the injection pressure, and it is not necessary to provide a large number of air vents in the vicinity of the hollow ring portion.

According to a second aspect of the present invention, in the first aspect, the connecting portion is formed so as to extend linearly from the center of the longitudinal axis of the preform body in the radial direction.

With this configuration, the pressure loss of the resin flowing through the region forming the connecting portion is reduced, so that a short shot in the hollow ring portion can be more reliably prevented.

According to a third aspect of the present invention, in the first or second aspect, the connecting portion has a vertical section whose vertical height is larger than a horizontal width.

With this arrangement, when the amount of resin flowing through the region forming the connecting portion is increased and short shots in the hollow ring portion are more reliably prevented, the range of the central hollow region of the hollow ring portion is reduced. Is minimized,
The grip operability of the handle is not impaired.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Description of Preform with Handle) First, the preform with handle will be described with reference to FIGS. 1 (A), 1 (B) and 1 (C). The preform 100 with a handle is roughly divided into a preform main body 110 and a handle portion 120. As shown in FIG. 1A, the preform main body 110 includes a neck portion 112, a body portion 114 extending below the neck portion 112,
And a bottom portion 116 for closing a lower end of the body portion 114. In FIG. 1A, a gate mark 116A remains on the bottom portion 116, but this may be cut after the injection molding of the preform 100 with a handle.

As shown in FIG. 1B, the handle portion 120 has a base 122 extending horizontally toward the side from the neck portion 112, a horizontal portion further extending toward the side from the base 122, and a hollow center. Hollow ring part 12 having region 123
4 and the hollow region 1 of the hollow ring 114 from the base 122.
25, and connects to the free end 124A side of the hollow ring portion 124 and the base 122.
And

The preform body 110 and the handle 1
20 is integrally formed by injection molding using a molding resin material such as polyethylene terephthalate.

As shown in FIG. 1B, a groove 123 having a substantially V-shaped cross section is formed on the lower surface of the base 122.
23 constitutes a hinge part.

As shown in FIG. 1A, the connecting portion 126 is formed in a straight line toward the outside in the radial direction by the center P of the longitudinal axis of the preform main body 110. In other words, the connecting portion 126 is provided at a position that bisects the central hollow region 125 of the hollow ring portion 124. In other words, the hollow ring part 124 has a shape symmetrical with respect to the center line of the connecting part 126. This connection is shown in FIG.
As shown in the AA cross-sectional view of (A), the vertical height H1 of the vertical cross section is larger than the horizontal width W.

Here, the hollow ring portion 124 has reinforcing ribs 124B and 124C protruding from the front and back surfaces of the hollow ring portion 124 at an inner edge portion facing the hollow region 125. The height H3 of the rib 124C formed in the straight region is set higher than the height H2 of the rib 124B formed in the arc region of the inner edge portion of the hollow ring portion 124.

One end of the connecting portion 126 is started from a position radially outward of the groove 123 of the base 122, and the starting end of the connecting portion 126 is formed on the lower surface of the base 122 so that its thickness gradually increases downward. It is inclined to reach the height H1. The terminal end of the connecting portion 126 is connected to a reinforcing rib 124C in a linear region of the hollow ring portion 124. The injection molding of the preform 100 with a handle is performed by clamping the injection molding die and then filling the molding resin material from the position of the gate mark 116A into the injection molding die. At this time, a cavity for molding the preform main body for the preform main body 110 and the handle 1 are provided in the injection mold.
A cavity for the handle portion is formed for communicating with the cavity for molding the preform body.

Therefore, the molding resin material flowing into the handle molding cavity passes through the preform body molding cavity, and the resin pressure is reduced.

However, according to the present embodiment, a short shot did not occur even in a region where the resin reaches the slowest. This region is a region B shown in FIG. This region B is a region where, in the case of the related art in which the connecting portion 126 does not exist, the resin that flows by being branched into two along the hollow ring portion 124 by the base portion 122 is joined. In the present embodiment, the resin flowing along the connecting portion 126 is also joined to the region B. Therefore,
In the present embodiment, the pressure of the molding resin material flowing into the region B can be secured higher than in the case of the related art, and thus no sheet shot occurs.

As long as the pressure of the molding resin material flowing into the region B can be kept high, it is not necessary to provide a large number of air vents near the hollow ring portion 124 for releasing the air pushed out by the molding resin material. If the hollow ring part 12
When air venting is performed in many places near the area 4, the resin enters the grooves for the air vents and forms burrs. However, in this embodiment, it is necessary to provide many air vents near the hollow ring portion 124. Is unnecessary, so that generation of burrs can be prevented.

(Description of Container with Handle) FIG.
1 shows a bottle 130 with a handle, which is a container obtained by biaxially stretch blow molding the preform 100 with a handle shown in (A) to (C).

Since the bottle with handle 130 has a portion which is not substantially changed from the portion of the preform 100 with handle, the portion is denoted by the same reference numeral as the portion of the preform 100 with handle. That is, the bottle with handle 130 roughly includes a bottle main body 132 and a handle portion 120. The bottle body 132 is attached to the neck 11
2, a body 134 extending below the body 2, and a bottom 136 for sealing the lower end of the body 134. As described above, since the neck portion 112 and the handle portion 120 of the bottle with handle 130 are not blow-molded, they have substantially the same configuration as the corresponding portion of the preform 100 with handle.

In such a bottle with handle 130, the handle portion 120 is reinforced by the connecting portion 126 and short shot is also prevented, so that the mechanical strength is further increased. I have. For this reason, in the state where the contents are filled in the bottle main body 132, the handle 12
Even if the bottle with handle 130 is lifted while gripping the handle 0, the handle portion 120 can be prevented from being damaged.

Moreover, since the horizontal width W of the handle portion 120 is smaller than the vertical height H1 as shown in FIG. 1C, the central hollow region of the hollow ring portion 124 can be secured to the maximum.
Operability is not impaired.

(Explanation of Stretch Blow Molding Machine) FIG. 3 is a plan view of a stretch blow molding apparatus for molding a preform 100 with a handle and a bottle 130 with a handle.

This stretch blow molding apparatus is roughly divided into a preform molding station 12 on a machine base 10,
A blow molding station 14 and a transfer section 16 located between the preform molding station 12 and the blow molding station 14 are provided.

The preform molding station 12 has two injection core molds 58 at two positions separated by 180 degrees in rotation angle.
(Not shown in FIG. 3; see FIG. 5), and a rotating disk 1 that intermittently circulates and transports the injection core mold 58 along the rotary transport path.
8 At each stop position of the injection core mold 58, an injection molding part 22 is provided at a position facing the injection device 20, and a take-out part 24 is provided facing the injection molding part 22. The injection molding unit 22 has an injection cavity mold 68 that is driven to be clamped relative to the injection core mold, and simultaneously injects, for example, four handle-equipped preforms 100 each having a handle part 120 in a neck part 112. Molding.

On the other hand, in the unloading section 24, the preform 100 with a handle can be relatively released from the injection core mold 58 to take out the preform 100 with the handle from the injection core mold.

In this embodiment, the neck 112 of the preform 100 with a handle is connected to the neck cavity mold 56.
The preform 100 with a handle is held by the neck cavity mold 56 and the injection core mold 58 and is conveyed to the take-out part 24 by the rotating disk 18.

Then, in the take-out section 24, after the injection core mold 58 is partially released due to the lowering of the neck cavity mold 56, the neck cavity mold 56 is opened to take out the preform 100 with a handle.

As shown in FIG. 3, the blow molding station 14 rotates four sprockets 30, a transport chain 32 bridged over them, and a device (not shown) for driving the sprockets 30, for example, one sprocket 30. Transport means 3 for circulating transport comprising an electric motor to be driven, a rack attached to a hydraulic cylinder, a pinion attached to a sprocket 30, and the like.
4

A plurality of, for example, 12 transport members 36 are fixed to the transport chain 32 at a predetermined distance, and the preform 100 with a handle or the bottle 130 with a handle is supported by each of the transport members 36. It has become. A receiving section 40 that receives the preform 100 with a handle from the delivery section 16 is provided in the transport path of the transport member 36.
And the preform with handle 10 received by the receiving unit 40
0, which is heated to a suitable temperature or higher by blow molding, a blow molding section 44 for obtaining a bottle 130 with a handle by stretching blow molding the preform 100 with a handle heated by the heating section 42, and a blow molding with the blow molding section 44. And a container take-out part 46 for taking out the bottle with handle 130 to the outside of the apparatus.

A heating device 43 is disposed in the heating section 42. The heating device 43 is provided with, for example, a plurality of infrared heaters extending along a conveying path arranged in the height direction of the preform, and passes through the heating device 43. At this time, the sprocket for rotation provided on the transport member 36 is meshed with the chain for rotation and the preform is rotated, so that the circumferential direction is evenly heated while rotating.

As shown in FIG. 3, the blow molding section 44
It has a blow cavity mold 48 composed of a split mold and a bottom mold (not shown). The blow cavity 48 is provided with a neck holder (not shown) for holding the neck 112 at a portion corresponding to the neck 112 of the preform 100 with a handle. Then, while holding the neck 112 of the preform 100 with a handle by the neck holder,
High pressure air is blown into the preform 100 with handle,
By driving a stretching rod (not shown) to stretch, the bottles with handles 130 along the shapes of the blow cavity mold 48 and the bottom mold are stretch blow-molded, for example, one by one.

The container take-out section 46 is operated by a take-out device 47
The bottle with handle 130 is turned upside down and taken out in an upright state.

The delivery section 16 reverses the upright-equipped preform with handle 100 taken out from the take-out section 24 of the preform molding station 12 to an inverted state and delivers it to the receiving section 40 of the blow molding station 14. It is.

At the take-out section 24 of the preform molding station 12, the number of preforms 100 with handles that are simultaneously molded in the injection molding section 22 (four in this example) is taken out. Thus, for example, four preforms 100 with a handle taken out at the same time are transferred to the receiving unit 40 one by one.

Further, in the blow molding station 14, the conveying means 34 intermittently conveys the conveying member 36, and the heated preform 100 with the handle between the heating section 42 and the blow molding section 44 is intermittently moved. The standby unit 50 is set to stop and temporarily wait.

FIG. 4 is a plan view showing the mounting structure of the lower surface of the turntable 18 as seen through the turntable 18, and FIG. 5 shows a state in which the injection mold in the injection molding section 22 is clamped.

In FIG. 4, the rotating disk 18 includes a rotating shaft 52.
Are rotated alternately every 180 degrees. The direction of arrow C indicates the direction of injection from the injection device 20, and the injection molding unit 22 is disposed at a position on the injection device side with respect to the rotary shaft 52, and the extraction unit 24 is located at a position facing the injection molding unit 22. Is arranged.

Two sets of an injection core mold and a neck cavity mold are attached to the rotary plate 18 at positions corresponding to the injection molding section 22 and the take-out section 24. FIG. 4 shows an injection core pressing plate 54 and a neck cavity mold. The state where 56 is attached is shown.

As shown in FIG. 5, between the injection core pressing plate 54 and the neck cavity die 56, an injection core fixing plate 60 having four injection core die 58 attached thereto, and a preform 100 with a handle are taken out. Eject plate 6 for
2 is attached. In addition, the injection core mold 56 is hollow, and a cooling pipe 56A is disposed therein. Each passage 56B, 56 inside and outside this cooling pipe 56A
C circulates cooling water. In addition, the injection cavity mold 68
A cooling water passage 68B is also formed around the cooling water passage so that the cooling water is circulated. These passages 56B, 56
By circulating cooling water through C and 68B through the rotating shaft 52 of FIG. 4, the preform 100 with a handle is cooled.

Further, as shown in FIG.
In the machine base 10, an injection cavity mold 68 is fixedly arranged corresponding to one set of the injection core mold 51 and the neck cavity mold 56.

Injection core mold 51, neck cavity mold 56
By clamping the injection cavity mold 68, the preform main body molding cavity 70 that defines the main body 110 of the handle-equipped preform 100 is formed.

Further, by clamping the neck cavity mold 56 and the injection cavity mold 68, a handle portion for forming a handle portion 120 integrally formed with the neck portion 112 of the preform main body 110 is provided therebetween. A molding cavity 72 is formed. Each of these cavities 70,
Reference numeral 72 is in communication, and the molding resin material is filled through a gate port 68A at the bottom of the injection cavity mold 68.

The injection core mold 5 provided on the rotating disc 18
8 and neck cavity mold 56 and injection cavity mold 68
And injection of the molding resin material to form the neck 1
A preform 100 with a handle having a tubular shape and having a bottom having a handle portion 120 at 12 is formed.

At this time, the arrival position of the resin farthest from the gate opening 68A is the area B in FIG. 1A as described above. In this embodiment, three resin paths, that is, two resin paths along the hollow ring part 124 and one resin path along the connecting part 126 shown in FIG.
The pressure of the molding resin material reaching the region B of (A) can be sufficiently secured. Thereby, the normal injection pressure, for example, 6.5 Mp
a (66.2818 kgf / cm ² ), no short shot occurs in the area B even when injection molding is performed. Furthermore, since it is not necessary to provide many air vents near the hollow ring portion 124, the occurrence of burrs can be prevented.

Accordingly, since the neck cavity mold 56 is not pushed and opened on the side of the take-out portion forming cavity 72 due to the generation of burrs, damage to the mold is also prevented.

At the positions corresponding to the handle cavity 72 of the neck cavity mold 56 and the injection cavity mold, push pins 84 constituted by springs 82 are provided in opposite directions, respectively. It is separated from the neck cavity mold 56 and the injection cavity mold 68.

The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the present invention.

For example, in the above embodiment, the stretch blow molding apparatus in which the preform molding station and the blow molding station are integrated has been described. However, the present invention is not limited to this example. It is also possible to configure as a molding device, or to configure the blow molding station as a single blow molding device.

In the above-described embodiment, a case has been described in which four preforms are injection-molded at the preform molding station and one preform is blow-molded at a time at the blow molding station. The number of simultaneous injection moldings and the number of simultaneous blow moldings can be appropriately changed.

In the above-described embodiment, the free end 124A of the handle is formed in a straight line, but may be, for example, a heart-shaped constriction. 125 may not necessarily be formed symmetrically with respect to connecting part 126.

[0066]

[Brief description of the drawings]

1 (A) to 1 (C) are a plan view, a front view, and an AA cross-sectional view of a preform with a handle according to the present invention.

FIG. 2 is a front view of the container with a handle according to the present invention.

FIG. 3 is a plan view showing a stretch blow molding apparatus for molding a preform and a container according to the present invention.

FIG. 4 is a plan view showing a see-through structure of a lower surface of the turntable of FIG. 3;

FIG. 5 is a sectional view of the preform molding station of FIG. 3;

[Explanation of symbols]

 12 Preform molding station 14 Blow molding station 18 Turntable 22 Injection molding section 24 Extraction section 32 Transport chain 34 Transport means 36 Transport member 40 Receiving section 42 Heating section 44 Blow molding section 48 Blow cavity mold 56 Neck cavity mold 58 Injection core Mold 68 Injection cavity mold 70 Preform body molding cavity 72 Handle molding cavity 100 Preform with handle 110 Preform body 112 Neck 114 Body 116 Bottom 120 Handle 122 Base 124 Hollow ring 125 Hollow area 126 Connection 130 Container with handle 132 Container body 134 Body 136 Bottom

Claims (6)

[Claims] 1. A preform body having a neck portion, a body portion extending below the neck portion, and a bottom portion closing a lower end of the body portion, and a handle formed on the neck portion of the preform body. The handle portion includes a base portion extending laterally from the neck portion, a hollow ring portion extending further laterally than the base portion, and having a hollow region at the center, and a hollow ring portion having a hollow region at the center. A preform with a handle, comprising: a connecting portion formed across the hollow region and connecting the free end side of the hollow ring portion to the base. 2. The preform with a handle according to claim 1, wherein the connecting portion is formed so as to extend straight in a radial direction from a center of a longitudinal axis of the preform main body. 3. The preform with a handle according to claim 1, wherein a vertical height of a longitudinal section of the connecting portion is larger than a horizontal width. 4. A container body having a neck portion, a body portion extending below the neck portion, and a bottom portion closing a lower end of the body portion, and a handle formed on the neck portion of the container body, A handle portion, a base portion extending laterally from the neck portion, a hollow ring portion extending further laterally than the base portion, and having a hollow region in the center, and the hollow portion of the hollow ring portion from the base portion. A handle formed across the region and connecting the free end of the hollow ring to the base. 5. A molding method for molding the preform according to claim 1, wherein a neck cavity mold for defining an outer wall of the neck portion of the preform body, and the body of the preform body. An injection cavity mold defining a portion and an outer wall of the bottom,
An injection core mold that defines an inner wall of the preform is clamped to form the preform body molding cavity, and a handle portion forming cavity communicated with the preform body molding cavity. Filling the cavity for forming the preform main body with a molding resin material from a position facing the bottom of the preform main body, and injection molding the preform main body; and the cavity for forming the preform main body. Through
A step of injecting the molding resin material into the neck molding cavity and injection molding the handle. In the injection molding step of the handle, the molding resin material is formed from a region opposed to the base. Wherein the hollow ring portion and the connecting portion are injection-molded. 6. A blow molding method for a container with a handle, characterized in that the body and the bottom of the preform with a handle formed by the method of claim 5 are stretch blow-molded to form a container with a handle.