JP4162776B2 - Preform with handle and container with handle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a preform having a handle portion at a neck portion, a molding method thereof, a container with a handle, and a molding method thereof.
[0002]
[Background Art and Problems to be Solved by the Invention]
The applicant of the present application has disclosed a preform and a container having a handle portion in Japanese Patent Laid-Open No. 10-113978.
[0003]
In this preform with a handle, a hollow ring portion is formed integrally with the neck portion as a handle.
[0004]
Here, in the injection molding of a normal preform, since the resin is filled from one place of the bottom of the preform, the resin reaches the neck portion the latest. In particular, in the case of a preform with a handle, the handle that extends laterally from one side surface of the neck portion has a resin flow path bent so that the resin is less likely to flow than the neck portion.
[0005]
Furthermore, in the hollow ring part of the handle part, the resin path is branched into two along the ring part and flows, so that the resin is more difficult to flow.
[0006]
Depending on the selection of the resin and the plasticized state, a short shot may occur, which not only lowers the mechanical strength of the handle but also reduces the commercial value.
[0007]
For this reason, it is necessary to increase the injection pressure excessively even when injection molding is performed on a normal preform.
[0008]
Therefore, an attempt was made to improve the flow of the resin by providing a lot of air vents in communication with the cavity forming the hollow ring portion and releasing the air in the cavity pushed out by the resin by the air vent.
[0009]
However, if a large number of air vents are provided, burrs are likely to occur in the hollow ring portion, and this phenomenon becomes more prominent as the injection pressure is increased, and the commercial value of the preform and thus the commercial value of the container with a handle formed thereby is significantly reduced. .
[0010]
As another problem, this type 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, the hollow ring part of the handle part is heavy. There was also a problem that it could not withstand and deformed.
[0011]
An object of the present invention is to provide a preform having a handle without a short shot or deformation, a molding method thereof, a container with a handle, and a molding method thereof.
[0012]
Another object of the present invention is to provide a preform and the molding method and the handled container and its molding method that has a handle with no burrs.
[0013]
[Means for Solving the Problems]
The preform with a handle according to the invention of claim 1 is:
A preform body having a neck portion, a trunk portion that continues below the neck portion, and a bottom portion that closes a lower end of the trunk portion;
A handle formed on the neck of the preform body;
Have
The handle is
A base portion extending laterally from the neck portion;
A hollow ring portion extending further to the side than the base and having a hollow region in the center;
A connecting portion that is formed across the hollow region of the hollow ring portion from the base portion, and connects the free end side of the hollow ring portion and the base portion;
It is characterized by having.
[0014]
The invention of claim 4 defines a container with a handle formed using the preform with handle of claim 1, and the structure of the handle in this case is the same as that of claim 1.
[0015]
The invention of claim 5 is a molding method for molding the preform of claim 1,
A neck cavity mold that defines the outer wall of the neck portion of the preform body, an injection cavity mold that defines the outer wall of the body and the bottom of the preform body, and an injection core mold that defines the inner wall of the preform And forming a cavity for forming the preform body, and forming a cavity for forming a handle portion that communicates with the cavity for molding the preform 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, and injection molding the preform main body;
Through the preform body forming cavity, allowing the molding resin material to flow into the neck portion forming cavity and injection molding the handle portion;
Have
In the injection molding process of the handle part,
The molding resin material is branched in three directions from a region facing the base, and the hollow ring portion and the connecting portion are injection-molded.
[0016]
The invention of claim 6 defines blow molding for forming a container with a handle using a preform with a handle formed by the method of claim 5.
[0017]
According to the first, fourth, fifth and sixth inventions, as shown in the fourth aspect, the resin path for forming the hollow ring portion is secured in three directions due to the presence of the connecting portion. Short sailboats at the ring are prevented. In addition to increasing the mechanical strength of the hollow ring portion by preventing this short shot, it is also reinforced by the connecting portion, so a handle with less deformation can be obtained. Since the resin flow is thus improved, it is not necessary to increase the injection pressure excessively, and it is not necessary to provide a large number of air vents in the vicinity of the hollow ring portion, so that generation of burrs is reduced.
[0018]
The invention of claim 2 is the invention according to claim 1,
The connecting portion is characterized by extending in a straight line from the center of the longitudinal axis of the preform body in the radial direction.
[0019]
By doing so, the pressure loss of the resin flowing through the region forming the connecting portion is reduced, so that a short shot at the hollow ring portion can be more reliably prevented.
[0020]
The invention of claim 3 is the invention according to claim 1 or 2,
The connecting portion is characterized in that a vertical height of a longitudinal section thereof is larger than a horizontal width.
[0021]
In this way, the amount of resin flowing in the region forming the connecting portion is increased, and when the short shot at the hollow ring portion is more reliably prevented, the range of the hollow region at the center of the hollow ring portion is minimized. Therefore, the grip operability of the handle part is not impaired.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0023]
(Description of preform with handle)
First, a preform with a handle will be described with reference to FIGS. 1 (A), (B), and (C). The preform with handle 100 is roughly divided into a preform body 110 and a handle portion 120. Preform body 110, as shown in FIG. 1 (B), having a neck portion 112, a body portion 114 following the downward and a bottom 116 which closes the lower end of the body portion 114. In FIG. 1 (B), the gate mark 116A is left on the bottom 116, which may be cut after injection molding of the handle with preform 100.
[0024]
As shown in FIGS. 1 (A) and 1 (B), the handle portion 120 includes a base portion 122 that extends horizontally from the neck portion 112 toward the side, a horizontal portion that extends further laterally than the base portion 122, and a central portion. A hollow ring portion 124 having a hollow region 123, and a connecting portion 126 that is formed across the hollow region 125 of the hollow ring portion 114 from the base portion 122 and connects the free end portion 124 A side of the hollow ring portion 124 and the base portion 122. Have
[0025]
The preform body 110 and the handle portion 120 are integrally formed by injection molding using a molding resin material such as polyethylene terephthalate.
[0026]
As shown in FIG. 1B, a groove 123 having a substantially V-shaped cross section is formed on the lower surface of the base portion 122, and this groove 123 constitutes a hinge portion.
[0027]
As shown in FIG. 1A, the connecting portion 126 is formed in a straight line toward the radially outer side by the longitudinal axis center P of the preform 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 portion 124 has a shape symmetrical with respect to the center line of the connecting portion 126. As shown in the AA cross-sectional view of FIG. 1A, the connecting portion has a vertical height H <b> 1 in the longitudinal section that is greater than the horizontal width W.
[0028]
Here, the hollow ring portion 124 has reinforcing ribs 124 </ b> B and 124 </ b> C protruding from the front and back surfaces of the hollow ring portion 124 having a thickness H <b> 4 at the inner edge facing the hollow region 125. The height H3 of the rib 124C formed in the linear region is set higher than the height H2 of the rib 124B formed in the arc region in the inner edge portion of the hollow ring portion 124.
[0029]
One end of the connecting portion 126 is started from a position radially outward from the groove 123 of the base portion 122, and the starting end of the connecting portion 126 is inclined to the lower surface of the base portion 122 so that the thickness gradually increases downward. The height H1 is reached. The terminal end of the connecting portion 126 is connected to the reinforcing rib 124 </ b> C in the straight region of the hollow ring portion 124. The injection molding of the preform 100 with a handle is performed by filling the injection mold with a molding resin material from the position of the gate mark 116A after the injection mold is clamped. At this time, in the injection mold, there are a preform body molding cavity for the preform body 110 and a cavity for the handle portion 120, which are in communication with the preform body molding cavity. And are formed.
[0030]
Therefore, the molding resin material that flows into the handle portion molding cavity passes through the preform body molding cavity, and the resin pressure is reduced.
[0031]
However, according to the present embodiment, no short shot occurs even in the region where the resin reaches the latest. This area is an area B shown in FIG. In the case of the prior art in which the connecting portion 126 does not exist, this region B is a region where the resin that is branched into two along the hollow ring portion 124 by the base portion 122 merges. In the present embodiment, the resin flowing along the connecting portion 126 is also joined to the region B. Therefore, in this embodiment, it is possible to secure a larger pressure of the molding resin material flowing into the region B than in the case of the prior art, thereby preventing a sheet shot.
[0032]
If the pressure of the molding resin material flowing into the region B can be secured high, it is not necessary to provide a large number of air vents in the vicinity of the hollow ring portion 124 for releasing the air pushed out by the molding resin material. If air venting is performed at many locations near the hollow ring portion 124, the resin enters the grooves for the air vent and becomes burrs. In this embodiment, however, the air venting is often performed near the hollow ring portion 124. Since it is not necessary to provide an air vent, the occurrence of burrs can be prevented.
[0033]
(Description of container with handle)
FIG. 2 shows a bottle 130 with a handle, which is a container obtained by biaxial stretching blow molding of the preform 100 with a handle shown in FIGS.
[0034]
Since this bottle 130 with a handle has a portion that is not substantially changed from the portion of the preform 100 with the handle, the same reference numeral as that of the preform 100 with the handle is attached to that portion. That is, the bottle 130 with a handle roughly includes a bottle main body 132 and a handle portion 120. The bottle main body 132 includes a neck portion 112, a trunk portion 134 that continues below the neck portion 112, and a bottom portion 136 that seals the lower end of the trunk portion 134. Thus, since the neck part 112 and the handle part 120 of the bottle 130 with a handle are not blow-molded, they have substantially the same configuration as the corresponding part of the preform 100 with a handle.
[0035]
In such a handle bottle 130, in addition to the handle portion 120 is intensity reinforced by connecting portion 126, the mechanical strength for short shots are also prevented is increasing further. For this reason, even if it grasps the handle part 120 and the bottle 130 with a handle is lifted in a state where the contents of the bottle main body 132 are filled, damage to the handle part 120 can be prevented.
[0036]
Moreover, since the handle portion 120 has a horizontal width W 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, and the operability is not impaired. .
[0037]
(Explanation of stretch blow molding machine)
FIG. 3 is a plan view of a stretch blow molding apparatus for molding the preform 100 with handle and the bottle 130 with handle.
[0038]
The stretch blow molding apparatus is roughly divided into a preform molding station 12, a blow molding station 14, and a delivery unit 16 located between the preform molding station 12 and the blow molding station 14 on a machine base 10. Is provided.
[0039]
The preform molding station 12 has injection core molds 58 (not shown in FIG. 3, see FIG. 5) at two positions 180 degrees apart from each other, and intermittently injects the injection core molds 58 along the rotary conveyance path. It has a rotating disk 18 that circulates and conveys it. 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 an extraction part 24 is provided facing the injection molding part 22. The injection molding part 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 preforms 100 with handles each having a handle part 120 at the neck part 112. Mold.
[0040]
On the other hand, in the take-out part 24, the preform 100 with a handle can be driven to release from the injection core mold 58 relatively, and the preform 100 with a handle can be taken out from the injection core mold.
[0041]
In this embodiment, the neck portion 112 of the preform 100 with handle is formed by a neck cavity mold 56 (not shown in FIG. 3, see FIG. 5). 56 and the injection core mold 58, and are conveyed to the take-out unit 24 by the rotating disk 18.
[0042]
In the take-out part 24, after the injection core die 58 is partially released by the lowering of the neck cavity die 56, the neck cavity die 56 is opened to take out the preform 100 with the handle.
[0043]
As shown in FIG. 3, the blow molding station 14 includes four sprockets 30, a transport chain 32 spanned over them, and a device (not shown) that drives the sprockets 30, for example, an electric motor that rotates one sprocket 30. In addition, it has a conveying means 34 for circulating conveyance constituted by a rack attached to the hydraulic cylinder and a pinion attached to the sprocket 30.
[0044]
A plurality of, for example, twelve conveying members 36 are fixed to the conveying chain 32 at a predetermined distance, and the preform 100 with a handle or the bottle 130 with a handle is supported on each conveying member 36. Yes. The conveying path of the conveying member 36 includes a receiving unit 40 that receives the preform 100 with a handle from the delivery unit 16, a heating unit 42 that heats the preform 100 with the handle received by the receiving unit 40 to a temperature appropriate for blow molding, A blow molding unit 44 that obtains a bottle 130 with a handle by subjecting the preform 100 with a handle heated by the heating unit 42 to stretch blow molding, and a container extraction unit 46 that takes out the bottle 130 with a handle blow molded by the blow molding unit 44 to the outside of the apparatus. And are provided.
[0045]
A heating device 43 is disposed in the heating unit 42, and the heating device 43 is arranged with, for example, a plurality of infrared heaters extending along the conveyance path in the height direction of the preform, and is conveyed when passing through the heating device 43. The rotation sprocket provided on the member 36 meshes with the rotation chain, and the circumferential direction is heated evenly while rotating the preform.
[0046]
As shown in FIG. 3, the blow molding unit 44 has a blow cavity mold 48 formed of a split mold and a bottom mold (not shown). The blow cavity mold 48, the neck holder for holding the neck portion 11 2 of the handle with preform 100 (not shown) is provided. Then, with the neck holder 112 holding the neck portion 112 of the preform 100 with the handle, high-pressure air is blown into the preform 100 with the handle, and a stretching rod (not shown) is driven to stretch, so that the blow cavity For example, the bottles with handles 130 along the shapes of the mold 48 and the bottom mold are stretch blow molded one by one.
[0047]
The container take-out unit 46 is configured to invert the bottle 130 with handle by the take-out device 47 and take it out in an upright state.
[0048]
The delivery unit 16 is configured to invert the upright preform 100 with a handle taken out from the take-out unit 24 of the preform molding station 12 to an inverted state and deliver it to the receiving unit 40 of the blow molding station 14.
[0049]
The take-out unit 24 of the preform molding station 12 takes out the preforms 100 with the number of simultaneous moldings (four in this example) in the injection-molding unit 22, but the delivery unit 16, for example, Four preforms 100 with handles taken out simultaneously are delivered to the receiving unit 40 one by one.
[0050]
Further, at the blow molding station 14, the conveying means 34 intermittently conveys the conveying member 36, and the preform 100 with a handle heated between the heating unit 42 and the blow molding unit 44 is intermittently stopped. It is set as a standby unit 50 for temporarily waiting.
[0051]
FIG. 4 is a plan view showing a mounting structure of the lower surface of the turntable 18 through the turntable 18, and FIG. 5 shows a mold clamping state of the injection mold in the injection molding portion 22.
[0052]
In FIG. 4, the turntable 18 is rotated every 180 degrees about the rotation shaft 52. An arrow C direction indicates an injection direction from the injection device 20. The injection molding unit 22 is disposed at a position on the injection device side across the rotation shaft 52, and a takeout unit 24 is positioned at a position facing the injection molding unit 22. Is arranged.
[0053]
Two sets of injection core molds and neck cavity molds are attached to the rotary disk 18 at positions corresponding to the injection molding part 22 and the extraction part 24. In FIG. 4, an injection core holding plate 54 and a neck cavity mold 56 are attached. Is shown.
[0054]
As shown in FIG. 5, between the injection core presser plate 54 and the neck cavity mold 56, an injection core fixing plate 60 with four injection core molds 58 attached, and an eject for taking out the preform 100 with a handle. A plate 62 is attached. Incidentally, the injection core mold 5 8 is hollow and the cooling pipe 5 8 A is disposed therein. Cooling water is circulated through the passages 5 8 B and 5 8 C inside and outside the cooling pipe 5 8 A. A cooling water passage 68B is also formed around the injection cavity mold 68 so that the cooling water is circulated. The preform 100 with a handle is cooled by circulating cooling water through the rotating shaft 52 of FIG. 4 in these passages 5 8 B, 5 8 C, and 68 B.
[0055]
Further, as shown in FIG. 5, the machine base 10 of the injection molding unit 22, injection cavity mold 68 is fixedly disposed so as to correspond to a set of injection core mold 5 8 and the neck cavity mold 56.
[0056]
By clamping the injection core mold 5 8 , the neck cavity mold 56 and the injection cavity mold 68, a preform body molding cavity 70 that defines the body 110 of the preform 100 with handle is formed.
[0057]
Further, by clamping the neck cavity mold 56 and the injection cavity mold 68, a handle portion forming cavity for forming a handle portion 120 formed integrally with the neck portion 112 of the preform main body 110 is formed therebetween. 72 is formed. These cavities 70 and 72 are in communication with each other and filled with a molding resin material through a gate port 68A at the bottom of the injection cavity mold 68.
[0058]
Then, the turntable 18 the injection core mold 58 is provided in and the neck cavity mold 56, and injection cavity mold 68, and mold clamping, a bottomed cylinder having a handle portion 120 to neck portion 112 by injection molding a resin material A preform 100 with a handle is formed.
[0059]
At this time, the arrival position of the resin farthest from the gate port 68A is the region B in FIG. 1A as described above. In the present embodiment, a total of three resin paths including two resin paths along the hollow ring portion 124 and one resin path along the connecting portion 126 shown in FIG. A sufficient pressure of the molding resin material reaching the region B can be secured. As a result, even if injection molding is performed at a normal injection pressure, for example, 6.5 MPa (668.218 kgf / cm ² ), no short sailboat is generated in the region B. Further, since it is not necessary to provide many air vents in the vicinity of the hollow ring portion 124, the generation of burrs can be prevented.
[0060]
Therefore, since the neck cavity mold 56 is not pushed open on the side of the extraction portion molding cavity 72 due to the generation of burrs, damage to the mold is prevented.
[0061]
Incidentally, at a position corresponding to the neck cavity mold 56 and injection cavity mold of the handle molding cavity 72, the extrusion pin 84, which is configured in opposite directions by the spring 82 are respectively provided, the handle portion 120 at the time of mold opening, the neck cavity The mold 56 and the injection cavity mold 68 are separated from each other.
[0062]
The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention.
[0063]
For example, in the above-described embodiment, the stretch blow molding device 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, and the preform molding station is a single injection molding device. The blow molding station can be configured as a single blow molding device.
[0064]
In the above embodiment, the case where four preforms are injection-molded at the preform molding station and the preforms are blow-molded one by one at the blow molding station has been described. The number of injection moldings and the number of simultaneous blow moldings can be changed as appropriate.
[0065]
In the embodiment described above, the free end 124A of the handle portion is formed in a straight line. However, the handle portion may be constricted in a heart shape, for example, or the hollow region 125 is connected in consideration of easiness to hold. It does not necessarily have to be symmetrical with respect to the portion 126.
[0066]
[Brief description of the drawings]
FIGS. 1A to 1C 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 a 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.
4 is a plan view illustrating a mounting structure of a lower surface of the rotating disk in FIG.
5 is a cross-sectional view of the preform molding station of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 12 Preform molding station 14 Blow molding station 18 Turntable 22 Injection molding part 24 Extraction part 32 Conveying chain 34 Conveying means 36 Conveying member 40 Receiving part 42 Heating part 44 Blow molding part 48 Blow cavity type 56 Neck cavity type 58 Injection core Mold 68 Injection cavity mold 70 Preform body molding cavity 72 Handle portion molding cavity 100 Preform with handle 110 Preform body 112 Neck portion 114 Body portion 116 Bottom portion 120 Handle portion 122 Base portion 124 Hollow ring portion 125 Hollow region 126 Connecting portion 130 Container with handle 132 Container body 134 Body 136 Bottom

Claims (4)

A preform body having a neck portion, a trunk portion that continues below the neck portion, and a bottom portion that closes a lower end of the trunk portion;
A handle formed on the neck of the preform body;
Have
The handle is
A base portion extending laterally from the neck portion;
A hollow ring portion extending further to the side than the base and having a hollow region in the center;
A connecting portion that is formed across the hollow region of the hollow ring portion from the base portion, and connects the free end side of the hollow ring portion and the base portion;
Have
The connecting portion is characterized in that the vertical height of the longitudinal section is larger than the horizontal width, and the vertical height of the longitudinal section of the connecting portion is larger than the vertical height of the longitudinal section of the hollow ring portion itself. A preform with a handle. In claim 1,
The preform with a handle, wherein the connecting portion is formed to extend in a straight line from the center of the longitudinal axis of the preform body in the radial direction. In claim 1 or 2,
Reinforcing ribs that protrude from the front and back surfaces of the hollow ring portion are formed on the free ring end side of the hollow ring portion and on the periphery of the hollow region,
A preform with a handle, wherein one end of the connecting portion is connected to the reinforcing rib. A container body having a neck part, a trunk part that follows the neck part, and a bottom part that closes a lower end of the trunk part;
A handle formed on the neck of the container body;
Have
The handle is
A base portion extending laterally from the neck portion;
A hollow ring portion extending further to the side than the base and having a hollow region in the center;
A connecting portion that is formed across the hollow region of the hollow ring portion from the base portion, and connects the free end side of the hollow ring portion and the base portion;
Have
The connecting portion is characterized in that the vertical height of the longitudinal section is larger than the horizontal width, and the vertical height of the longitudinal section of the connecting portion is larger than the vertical height of the longitudinal section of the hollow ring portion itself. A container with a handle.

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