JPH09131781A - Blow-molded plastic container and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a preform and to provide an economical and beautiful bottle. SOLUTION: A plastic preform 10 for forming a blow molded container having at least one inner wall member 20 formed separately from a molded plastic product is provided. The inner wall member 20 is extended so as to perfectly traverse the hollow space 18 of the container and the respective edges of the inner wall member 20 are bonded to a body part 14 to be integrated therewith.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a plastic preform for producing a plastic container, and more particularly to a plastic preform for a container for storing a fluid such as a carbonated beverage.

[0002]

2. Description of the Related Art The above-mentioned plastic container is manufactured from an injection-molded or extrusion-molded preform, and then the preform is put into a container having a proper shape and a blow mold having the above-mentioned shape is put into the container. It is manufactured by the blow molding method. Typical thermoplastic materials include:
Examples thereof include polyethylene terephthalate (PET) and polyolefin, but other materials can also be used.

The above preform and a container manufactured from the preform usually have a neck portion which is a cap holding means, a shoulder portion which is continuous with the neck portion, and a side wall or a main portion which is continuous with the shoulder portion and the bottom portion. It becomes. It is preferable that most of the above-mentioned containers have a shape in which the bottom surface thereof rises in a conical shape toward the inside like a champagne container.

In addition, a container having a large capacity is required because of its convenience and economy. For example, for carbonated drinks, 2 liter containers are widely used.
In reality, larger capacity containers are desired. However, such containers are difficult to handle, especially for children. In addition, the sidewalls of the container tend to swell, making the container more difficult to handle.

The above-mentioned containers are manufactured from various plastics, for example, milk bottles are made of polyethylene (P
E), polyvinyl chloride (PVC) is usually used as a container for holding water, and PET is used for carbonated drinks.

US Pat. No. 5,242,066 discloses a container having a neck, a side wall, and a bottom, and an inner wall member called a spider is arranged on the side wall of the container. This spider is used to increase the strength of the container. The container is
The spider, which is formed by injection molding of a preform and is integrated, is a separate member. The blow molded container is then sectioned into sections by the spider, which further reinforces the sidewalls.

In order to facilitate the handling of a large capacity container, a handle or a handgrip is attached by various methods. Mainly, the most suitable manufacturing method for obtaining the material and desired shape of the container. Determines the method to apply. Thus, in the extrusion blow molding of PE bottles, the hollow handle is usually manufactured simultaneously in the mold for molding the extruded preform into a bottle. Before applying the above method, a plastic preform such as extruded PE is required, and this plastic preform is melted by pressure. Bottles formed from PET injection molded preforms do not have a hollow integral handle. This is virtually impossible to melt the PET, so that the above technique did not allow a handle to be attached to the bottle on both ends.

Recently, a method of attaching a handle to a PET bottle has been proposed, but they are not integrated with the body of the container, and the bottle is not manufactured by blow molding from a preform. The method involves mechanically attaching a separately formed handle or forming the finished body using a separate forming step. These technologies are based on Nakam
Ura) in U.S. Pat. No. 4,727,997.
This method has not been commercially successful due to its high cost and low reliability.

Although the handgrip is used instead of the handle, the handle and the handgrip differ in the following points. That is, the handle is attached to or integrated with the bottle, and at least one finger of the user's hand can be held in a loop-shaped hole, and the hand grip, that is, the grip is a recess in the bottle. Is it designed so that the thumb and forefinger can hold the above-mentioned grip.

The grip can be manufactured in a mold from a conventional preform as an integral part of the bottle. At that time, the mold has a cavity corresponding to a grip in a part forming the container wall. PET bottles having the above-mentioned grips are commercially available and are used, for example, as containers for large spirits having a capacity of 2 or more, wine containers, and other liquid containers.

The above design cannot be used for bottles of carbonated drinks to which internal pressure is applied. This is because, when internal pressure is applied to a thin elastic body cylindrical body with dents, etc., it expands outwardly, so that the above-mentioned body loses the dent formed as a result of the pressure being applied, and is substantially a cylinder. This is because the cross section becomes a shape.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to improve preforms while providing an economical and aesthetically pleasing bottle. Also, the bottle is
In addition to having a grip on a part of its side wall, it has a reinforcing member integrated inside, and this reinforcing member is arranged so as to divide the container. The side wall can be reinforced by such a reinforcing agent, and warping due to internal pressure is eliminated.

Accordingly, it is a first object of the present invention to improve plastic preforms, improve blow molded plastic containers, and to provide a method for making such containers.

Further, the present invention provides an improvement so that the above-mentioned container can be produced on a commercial scale at low cost and quickly.

Other objects and effects of the present invention will be described later.

[0016]

According to the present invention, the above objects and effects can be easily obtained.

The present invention relates to a plastic preform for blow molding a plastic container. The preform is a plastic molded body having a neck portion having an opening, has an integrated body portion connected to the neck, and has a closed bottom portion connected to the body portion. Become. The body portion defines a hollow space that is closed at the bottom portion and opens at the neck portion. Furthermore, at least one of the inner wall members is formed separately from the entire molded body, and the inner wall member is inserted into the inside of the container and completely traverses the hollow space. Further, the inner wall member has an edge portion, and the edge is connected to the body portion and is attached by fusion bonding, adhesive agent or mechanical means.

The inner wall member is attached to the body and the bottom portion, and supports and reinforces the respective parts of the container formed by the blow molding. Further, the container may be adjusted so that it is fused only at a position where reinforcement and support of the container are required. The preform preferably has a tubular shape, and more preferably has a neck portion protruding outward.

In a preferred embodiment, the inner wall member is connected to the rigid portion that completely traverses the hollow space, the portion that is fused to the body portion, and the rigid portion, and the inner wall member is connected to the rigid portion. A frame portion that extends to the bottom and is fused to both the body and the bottom. A hollow internal space is defined between the rigid portion of the inner wall and the bottom of the preform.

The present invention also relates to a method for molding the above preform and a blow molding container manufactured from the preform. The container usually has a shoulder portion between the neck portion and the body portion, and the rigid portion of the inner wall member is disposed in the body portion between the shoulder portion and the bottom portion. .

In a preferred embodiment, the body portion is
A wall portion comprising at least two adjacent lobes, the lobes having two spaced apart recesses and extending from one of the spaced recesses to the other recess to form a handgrip. To have. The inner wall member extends from one of the spaced recesses to the other end.

The present invention forms a plastic preform suitable for forming blow molded plastic containers. When forming the above, the inner wall member is formed separately from the product. The member also has an edge portion, and the edge portion is integrated with the plastic molded body by fusing, adhesive, or mechanical means. At this time, the molded plastic product has a neck portion having an opening, a body portion connected to the neck portion, and a closed bottom portion connected to the body portion. The body portion also has a hollow space that is closed at the bottom and opens at the neck portion. Further, the inner wall member is arranged in this space, and the member extends completely across the hollow space and is integrated with the body portion.

In a preferred embodiment, the inner wall member is disposed in the slot of the injection core, and the plastic molded body is injection-molded so as to surround it, and the inner wall member is fused inside. It In a particularly preferred embodiment, the inner wall member is a frame-shaped member and has a frame portion that defines a rigid portion and a hollow region adjacent to the rigid portion. The frame-shaped member is disposed in the slot in the injection core, and the plastic molded body is injection molded so as to surround the periphery thereof as described above. The inner wall member has rigidity, extends completely across the hollow space, and is joined to the body portion. Further, the frame portion below the rigid portion extends to the bottom portion and defines a wide internal space between the rigid portion of the inner wall and the bottom portion of the preform. The frame-like member prevents molten plastic from entering the slot during injection molding. Further, the inner wall member may be fused to both the bottom portion and the body portion, and is preferably disposed on the body portion. Further, the inner wall member may be extended only to the body portion.

In addition to the above, separately formed inner wall members are disposed on a preformed plastic preform, and the edge portion of the inner wall member is moved to a desired position on the body portion of the preform. You may connect with.

The manufacturing method of the present invention is effective for forming a blow molded plastic container having an inner wall member therein by blow molding. Therefore, a preform having a desired shape can be formed. In a particularly preferred embodiment, the manufacturing method comprises blow molding the preform into a shape of a container body portion corresponding to the preform body portion, and forming at least two protrusions separated by a recess from the container body portion. Forming a part. At this time, the recess is partitioned by the inner wall member, the support is provided by the recess, and the handgrip is formed by the lobe.

The invention is particularly characterized in that the inner wall member may be of the same material as the other parts of the container, or of a different material, and adapted to the desired final properties.

According to the present invention, it is possible to provide a game using containers, that is, a game using containers. The process comprises the steps of providing a container having a walled hollow space having an inner surface and an outer surface, and comprising at least one inner wall member having an edge, the edge being connected to the inner surface. Attaching to the inner surface of the wall, providing means for displaying a visual pattern on the inner wall member, arranging means capable of distinguishing from the wall, and displaying the pattern visually through the wall And means for filling the hollow space with a flowable substance.

The present invention also relates to a container formed by the above process and preform for forming the container. The container has a wall having an inner surface and an outer surface, the wall having a hollow space and at least one inner wall member extending across the hollow space. The inner wall member has a plurality of edge portions and is joined to and integrated with the inner surface. The inner wall member has means for visually displaying the pattern, and the means for visually displaying the pattern is distinguishable from the wall.

The air conditioning and effects of the present invention will be described further below.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 illustrates a plastic preform 10 suitable for forming into a blow molded container. Preform 10
May be formed by any suitable means, and specific examples thereof include injection molding and extrusion molding. The preform 10 can be manufactured in advance by a continuous manufacturing process and then stored.
It can also be produced in-line by operating continuously. The preform comprises a neck 12, which may or may not have ridges. This neck has an opening 13,
It has a body portion 14 continuous from the neck portion and a closed bottom portion 16 continuous with the body portion.
The body portion of the preform is closed at the bottom portion and opened at the neck portion to define a hollow space 18. As shown in FIG. 1, the preform 10 has a tubular shape and can, of course, have any desired or convenient shape.

Although the inner wall member 20 is shown in FIG. 1 and is transparent, it is shown by a broken line. This inner wall member may be the same material as the above preform, or may be a different material. The inner wall member may be inserted into the hollow space 18 from the opening 13 by a robot (not shown). The preform has an edge region 22, which is arranged in contact with the body portion 14 and is fused at the site 24 (see FIG. 2) of the body portion, A preform having an inner wall member that is fused is formed.
The inner wall member 20 may have a decoration 21 on its surface, which will be visually observed through the wall of the final product.

The inner wall member of the member 20 can be manufactured by any desired and suitable method, and specific examples thereof include injection molding, extrusion molding, stamping, and conventional means other than the above. In the embodiment shown in FIG. 1, the inner wall member 20 has a rigid shape, but a shape other than this, for example, a shape as shown in FIG. 3 can be used. In FIG. 3, the inner wall member 20 'is one or more struts.
(struts) 26 and a space 28. Also, FIG. 4 shows that the inner wall member 20 ″ is a frame-shaped member 30 having an empty central portion. Warping the final product of the molded container to the outside by internal pressure,
Or support from the inside to prevent other deformation.

Accordingly, the present invention can provide a simple, effective and economical method of manufacturing a preform having an internal support wall. The inner support wall may extend to the body of the container as shown in FIG. 1 or may have any desired length so that it extends to the bottom. It is also possible to support the bottom. Also, the inner support wall may be further extended to the neck portion to form a preform having a plurality of compartments. Therefore, the present invention can provide a technique suitable for other uses as seen in various embodiments.

The disposition of the wall material can be carried out by any suitable mechanical means, in particular preferably a robot, which does not have to be attached to the means for producing the preform. . For example, in an injection molding machine equipped with a withdrawal robot, the robot can be used to dispose the preform and to fix the wall member to the assembly. Once placed, the wall member is integral with the inner wall of the preform. Any suitable means can be used for this purpose,
For example, means such as high frequency fusion, ultrasonic fusion, pressure fusion, and adhesive can be used.

The wall member 20 can also be fixed in the preform by mechanical means. this is,
As shown in the enlarged view (b) of FIG. 2, the site 24 (enlarged) is a tougue-groove.
The interlocking is provided with an assembly so that it can withstand the tension in the direction of the arrow 24a. In addition, the preform is blow-molded into the bottle shape and then pressed into the bottle shape.

The embodiment of FIGS. 5 and 6 shows a curved wall member 32 or a corrugated wall member 34,
Both of them are adapted to be stretched under tension as the preform expands during blow molding and to have a reduced wall thickness. Each member 32 or 34 is adapted to extend in length and cross section, respectively, depending on the sidewall of the blow molded container.

The wall member 20 can be formed of the same material as the preform 10, specifically, for example, PET or the like, or can be formed of another kind of metal such as plastic or aluminum. In addition, the member 20
May be transparent, semi-transparent, or colored to provide contrast with the preform 10. Also,
The member 20 may have a decoration in which a pattern such as "X" is displayed as shown in FIG.

Therefore, according to the embodiment shown in FIGS. 1 to 6, the preform having the inner wall inside can be easily and properly formed. The wall member must be precisely designed to meet the requirements, extend from the neck to the bottom if desired, and have the desired thickness distribution, shape, and injection molding machine. It is required to have an arrangement that does not limit the pressurization of.

In the embodiment shown in FIGS. 7 to 13, the separately formed inner wall member is arranged in the blow core,
The preform injection molding is performed so as to surround it to form a preform in which the inner wall member is integrated.

FIG. 7 shows the lower part of the blow core 36. The blow core has a slot 38 extending from the bottom 40 of the core to a suitable portion of the core. The plastic insert 42 may be formed of the inner wall member and manufactured by any suitable method, for example, injection molding, stamping, or the like. In the region of the preform that completely traverses the hollow portion, the insert comprises a rigid portion 44, as shown in FIG. Adjacent to the rigid portion 44, the insert 42 has a frame-like shape, as shown in FIG. 10, and has two parallel bars connected to a curved portion 48 defining a space 50. 46
Having. The insert 42 is disposed inside the slot 38 of the core 36 so as to conform to the shape of the core. Thus, the insert 42 has a rigid portion which is an inner wall member that extends completely across the hollow space of the preform. Further, the empty middle portion below the end of the rigid wall portion 44 becomes a frame.

FIG. 11 shows that the core 36 has the insert 42 inside and is arranged inside the injection molding machine 50. The molten plastic is injected around it to form a preform 52, which is fused to the insert 42 by pouring the molten plastic into the mold during injection. At this time, the bar 46 and the portion 48 prevent the molten plastic from entering the space 50. Preform 5 obtained
2 is shown in FIG. The edge 54 of the insert 42 has a slot 38 in at least the region of the rigid portion.
Can be made wider, in which case the edge will be surrounded by the molten plastic injected into the injection mold of the core 36. The edge 54 is
It has a serration 56 as shown in FIG. 13 to increase the contact surface between the edge and the heated plastic to be injected so that the edge and the plastic can be easily fused.

Thus, in operation, a robot will be used to place the insert 42 in the narrow slot 38, close the injection molding machine and inject the plastic. The edge 54 will be surrounded by molten plastic or hot plastic that has become hot. As a result, the edge and the molten plastic are fused. The frame portion of the insert prevents the molten plastic from flowing into the slot, and forms a space below the rigid portion of the insert. Bottom 4 of insert 42
Since 8 directly faces the injection gate and is exposed to the hottest plastic, it may be necessary to prevent it from melting. For the above purposes, the thickness of the bottom 48 has been increased to prevent the injected plastic from completely melting and preventing it from leaking into the slot 38.

The hot preform 52 described above is then placed in a blow mold 58, as shown in FIG. 14, and the container of the present invention is formed by blow molding.

The preform thus formed is heated to a temperature at which blow molding can be performed, and in blow molding, the preformed preform is heated or hot-pressed. It is applied by forming the reform in-line during injection molding. At this time, the temperature can be adjusted as desired. The heating of the inner wall may be performed by circulating heated air in the hollow space 60 if necessary, or by inserting a heater inside.

The heated preform is placed in a blow mold having the desired container shape, such as a blow mold 58 shown in FIG. During this time, compressed air is blown into the preform to expand the preform into a shape 62 shown by a broken line in FIG. 14 so as to be biaxially balanced and stretched in the long axis direction. become. The above steps can also be performed using one or more stretch rods to extend in the longitudinal direction. The insert, or inner wall member 42, expands until limited by the blow mold. The blow mold shown in FIG. 14 has a shape for forming the plastic container 64 as shown in FIG. 15, but it goes without saying that a blow mold having a different shape can be used. You can Also, if the desired final shape has at least two adjacent protrusions connected by a recess, the blow mold can be that shape. Similarly, although it is preferable to have a bottom portion facing inward in the longitudinal direction as shown in FIG. 15, the blow mold may have the above shape. The preform is blow molded to its shape and the inner wall is expanded as well.

Therefore, the neck portion 65 having the opening 66 is formed.
And a bottom portion 67, and a body portion 68 having a tubular body that connects the neck portion 65 and the bottom portion 67, and a blow-molded plastic container 64.
Is formed. When it is necessary to dispose a preform having a ridge on the closure mounting portion of the container, the neck portion 65 can be provided with a ridge 69. It is formed corresponding to the ridge. The bottom 67 has a base 70, which is generally conical inward in the axial direction. Further, the bottom portion may have a protrusion (not shown), and this protrusion is used for keeping the container upright and is commonly used in the art, which is called a foot. . In the bottom shape as described above, it is preferable that the inner wall portion symmetrically partitions the opposing feet. The container 64 also comprises a shoulder portion 71 which comprises the neck portion 65 and the tubular body portion 6 described above.
8 is connected.

The container 64 includes the inner wall 4 of the preform.
There is provided at least one inner wall 72 corresponding to 2, which inner wall extends completely inside the container 64 across the hollow space 73. In FIG. 15, the inner wall extends only to the body portion 68, but if desired, the inner wall extends longitudinally inward as in FIG. 18 to support the portion of the container by the inner wall 72 '. It may be extended to the extended portion 70.

The inner wall 72 is rigidly attached to the container, but is preferably joined to the body portion 68 of the container as shown in FIG.
As a result, the vessel wall of the container is firmly supported.

As shown in FIG. 16, the container body 68 defines adjacent parabolic lobes, which are both connected to a recessed area or recess 76. These recesses are particularly suitable as a handgrip for a large capacity container. Further, it may have a shape other than this. The inner wall member 78 forms a hollow space 73 in this embodiment, is connected to the recess 76 to form four conical projections, and supports the recess. The handgrip supported as described above does not protrude outside even if internal pressure is applied to the container.

In the embodiment shown in FIG. 17, one inner wall member 80 is shown with a lobe 82 which is smaller than the lobe 84, said inner wall traversing the hollow space 73. But it is off the center. The inner wall 80 is coupled to and supports the recess 83. In contrast, in the embodiment of FIG. 16, lobes 74 are shown, each lobe being of approximately equal size, and the inner support wall traversing the central portion of the hollow space 73. . As will be appreciated, the present invention contemplates the use of at least one or more internal support walls.

FIG. 19 shows a container 90 of the present invention. This container has a neck portion 91 having a ridge and a shoulder portion 9
2, a body portion 93, and a bottom portion 94.
Similar to the fifth embodiment. However, in this example,
The bottom portion 94 has a plurality of support fees 95, and the body portion 93 has a hand grip 9.
6 together with the internal support member 97. In this embodiment, the upper portion 98 of the support member 97 is bent in a concave shape. Since the upper end of the inner wall causes a particularly large amount of stress when internal pressure is applied, the container may rupture when pressure is applied when storing with the head on top. According to the embodiment of FIG. 19, the stress level can be minimized by extending the inner wall above the upper end of the handgrip 96. As shown in FIG. 19, the inner wall 97 is curved downward, because such a curvature provides a desired cross-sectional shape in which the wall thickness increases as it moves away from the recess. .

The inner wall member 20 is formed to resemble a display or a pattern for visually displaying a pattern, for example, using a marking 21 and a cut-out region 23 of the material. The member 25 and the like may be included as shown in FIGS. 1, 20, and 21, respectively. The display described above can be visually captured through the wall of the preform when it is expanded into a molded container into any final shape.

Visualization of the pattern by the marking 21 on the inner wall member 20 is important when playing a game using the container. The marking 21 is a pattern, and can communicate with a player who is generally a consumer of a beverage so that the consumer wins or loses, for example. For example, as in FIG. 1, the marking 21 may be in the form of a phrase with the phrases “your win”, “win”, “sorry”, etc., or other similar information as in FIG. Further, the marking 21 may be formed in a symbol shape such as a smiling face or a crying face showing the result, or may be painted according to a predetermined color tone. In addition to games such as those described above, the markings 21 may be used for purely decorative applications such as colored panels, carton characters or sports pictures. The marking 21 may be formed on the wall member 20 by etching, or may be formed by any method such as a stamping or other solvent-resistant printing method. In addition, a safe colored film or the like can be used to form various designs.

Further, the inner wall member has a cutout 23 having a rectangular shape or another shape, which can form a message for communication. In this case, the cut-out region of the material can be formed in a shape such as "W", "L" or "YOU WIN" as shown in FIG.
Instead, the inner wall member 20 may be formed as a shape 25 in FIG. 21 and used as a sign or a signal to convey the result of the game. That is, as shown in FIG. 21, the word “WIN” or “LOSE” is applied to the inner wall member.
The shape may be such as, or more simply, "W" or "L". In this case,
The inner wall member 20 has side supports 27a and 27b as members of the above preform or container. This will be described below.

Marking 21, cutout 23, shape 25
The wall member 20 having the above may be formed by any desired method or suitable method, and specific examples thereof include an injection molding method and an extrusion molding method, and stamping or other conventional molding methods. Can be manufactured using. When using the wall member 20 with cutouts 23 of material and when using the shape 25 as a wall, the material forming the inner wall may be cut using any device or stamping. Alternatively, it may be formed into a desired shape by using a manual or automated means. In the embodiment of FIG. 1, the wall member has a rigid shape. A cutout region of the material as shown in FIG. 3 is formed from the rigid initial shape. In the final blow-molded container even with the inner wall member, it is possible to provide internal support,
By supporting in this way, it is possible to prevent protrusion or deformation to the outside under pressure.

As mentioned above, the invention provides a simple, suitable and economical marking 21, material cut-out 23, shape 2.
It is possible to provide a method for forming a preform that includes 5 and has an inner wall that provides internal support. The inner wall may be limited to the body portion of the container as shown in FIG. 1 and may have any desired length. For example, it may extend all the way to the bottom to support the bottom, or it may extend all the way to the neck. Therefore, the present invention can provide a versatile and suitable means by which various embodiments can be manufactured.

The inner wall 72 is attached to the container as shown in FIG. 15, and further, the body portion 6 of the container.
8 is preferably adhered. As described above, referring to FIG. 22, the inner wall 72 comprises a visual display such as markings 76, or cutout areas of material, or formed as a particular shape. This means that the above preforms, specifically FIGS. 1, 20, and 2 are used.
As described for item 1, all of them are for game communication with the container. Therefore, the container is formed as a game piece, and its inner wall firmly supports the device wall.

In order to start a game in which the above-mentioned container is used as a game piece, the marking is first hidden from the person who plays the game so that a prize for winning can be obtained. For example, the container is transparent, and when there is a lot of beverage, the mark is hidden by the coloring of the beverage. When the consumer purchases the container and drinks a part of the container, the winning mark as described above appears. Also, the marking may itself change at room temperature or first opened by the consumer, or by an irreversible act by the consumer. Specifically, for example, in a vending machine or the like, when it is stored so as not to be seen from the outside, it cannot be returned again.

The present invention is not limited to the above-mentioned embodiments, but the above-mentioned embodiments are merely illustrative of preferred embodiments for carrying out the present invention. Therefore,
It is easy to infer that changes may be made in details of shape, size, arrangement of parts, and operation thereof within the scope and spirit of the invention as claimed in the present invention.

[Brief description of the drawings]

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

2 is a cross-sectional view (a) taken along line 2-2 of FIG. 1 and an enlarged view (b) of a connecting portion.

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 is a diagram showing another embodiment of the present invention.

FIG. 5 is a diagram showing another embodiment of the present invention.

FIG. 6 is a diagram showing another embodiment of the present invention.

FIG. 7 is a side view of a core for forming the preform of the present invention.

8 is a side view of an inner wall member used for the core of FIG. 7. FIG.

9 is a cross-sectional view taken along line 9-9 of FIG.

10 is a cross-sectional view taken along line 10-10 of FIG.

11 is a side view of a core-injection mold for forming the preform of the present invention using the core of FIG. 7 and the inner wall member of FIG. 8.

FIG. 12 is a partial cross-sectional view of the preform of the present invention formed by the core-injection mold of FIG. 11.

FIG. 13 is an enlarged view of another embodiment of the connecting portion between the inner wall and the inner surface of the container.

FIG. 14 is a partial cross-sectional view of a blow mold used for a container formed according to the present invention.

15 is an elevational view of the blow molded container produced according to FIG.

FIG. 16 is a view showing another embodiment of the container of the present invention.

FIG. 17 is a view showing another embodiment of the container of the present invention.

FIG. 18 is a cross-sectional view showing the bottom of the container of the present invention, which has a bottom protruding inward in the longitudinal direction.

FIG. 19 is an elevational view of another embodiment of the present invention.

FIG. 20 is a view showing another embodiment of the inner wall member of the present invention.

FIG. 21 is a view showing another embodiment of the inner wall member of the present invention.

FIG. 22 is an elevational view of a blow molded container having markings on its inner wall.

[Explanation of Codes] 10 ... Plastic preform 12 ... Neck part 13 ... Opening 14 ... Body part 16 ... Closed bottom part 18 ... Hollow space 20 ... Inner wall member 21 ... Marking

Claims (26)

[Claims] 1. A plastic preform for producing a plastic container by blow molding, comprising a neck portion having an opening, an integral body portion continuous with the neck portion, and a closed bottom portion continuous with the body portion. And a plastic molded body having, wherein the body portion forms a hollow space closed at the bottom portion and opened at the neck portion, and is formed separately from the plastic molded body to complete the hollow space. Having at least one inner wall member inserted into the interior of the hollow space so as to extend across, and the inner wall member has an edge portion, the edge portion being coupled to the body portion and the body portion. A plastic preform for forming a blow-molded plastic container, which is characterized by being integrated. 2. The preform according to claim 1, wherein the inner wall member is integrated with the body portion and the bottom portion. 3. The preform according to claim 1, wherein the inner wall member is limited in length so as to be integrated with only the body portion. 4. The inner wall member includes a rigid portion that extends completely across the hollow space and is fused to the body portion, and a frame portion adjacent to the rigid portion. The frame portion extends to the bottom portion and is fused to both the bottom portion and the body, and defines an internal hollow space between the rigid portion of the inner wall and the preform. The preform according to claim 1, wherein: 5. The inner wall member is fused to the body portion, adhered to the body portion, or mechanically coupled by fitting the inner wall member and the body portion together. The preform according to claim 1, which is characterized in that 6. The preform according to claim 1, wherein the inner wall member and the body portion are made of different materials. 7. The preform according to claim 1, wherein the inner wall member has a decoration or a color different from that of the body portion. 8. A blow-molded plastic container formed from a molded plastic preform, comprising a neck portion having an opening, a bottom portion, and a body portion integrally connected to the neck portion and the bottom portion. A plastic blow-molded body having the same, and a hollow space that is closed at the bottom and opened at the neck is formed by the neck portion, the body portion, and the bottom portion, and is separate from at least the plastic blow-molded body. And having an inner wall member extending completely across the hollow space, the inner wall member having an edge portion, the edge portion being joined to the body portion and integral with the body portion. A blow-molded plastic container characterized in that 9. The inner wall member is connected to the body portion and the bottom portion, or is limited in length so as to be connected only to the body portion. The described container. 10. The inner wall member has a rigid portion that is fused to the body portion so as to completely traverse the hollow space, and a frame portion adjacent to the rigid portion extends to the bottom portion of the body. 9. The hollow opening internal space is formed between the rigid portion of the inner wall member and the bottom portion of the preform by being fusion-bonded to both the base portion and the bottom portion. container. 11. The inner wall member has a rigid portion, the container has a shoulder portion between the neck and the body portion, and the rigid portion of the inner wall member includes the shoulder portion and the bottom portion. The container according to claim 8, wherein the container is arranged so as to be spatially separated from at least one of them, and the separated end portion is inside the body portion. 12. The body portion defines a region comprising at least two adjacent lobes, the lobes having two spatially spaced recesses, and the wall portion comprising: A hand grip is formed to extend from one of the spaced apart recesses to the other recessed portion, and the inner wall member extends from one of the spaced apart recessed portions to the other recessed portion. Item 8
A container according to claim 1. 13. The container according to claim 8, wherein the inner wall member has a concave upper surface. 14. The container according to claim 8, wherein the inner wall member is attached to the body portion by fusion bonding or an adhesive. 15. The container according to claim 8, wherein the inner wall member has a decoration on its surface, and the decoration can be visually identified through the plastic product. 16. A method of manufacturing a plastic preform for manufacturing a blow-molded plastic container, the method comprising the steps of forming an inner wall member having each edge portion, a neck portion forming an opening, and a neck portion forming the neck portion. A step of joining an edge portion of the inner wall member to a plastic molded body having a continuous body portion and a closed bottom portion that is continuous with the body portion, the body portion being closed at the bottom portion. A step of forming a hollow space opened at the neck portion, and the inner wall member extending so as to completely cross the hollow space and coupled to at least the body portion. And a step of forming the inner wall member separately and independently of the plastic molded body. A method for producing a blow-molded plastic container. 17. The bonding of the edge portions is performed by any method selected from fusion bonding, adhesion with an adhesive, and mechanical means by fitting.
7. The method according to 6. 18. The method of claim 17 including the step of blow molding the preform having the inner wall member fused thereto to form a blow molded plastic container having the inner wall member fused thereto. Plastic container manufacturing method. 19. The blow molding of the preform,
Forming a container body portion corresponding to the preform body portion, forming at least two lobes in the container body portion separated by a recess, the recess being separated by the inner wall member; 19. The method according to claim 18, wherein the lobe is supported together with the lobe and serves as a handgrip. 20. A plastic preform for producing a blow-molded plastic container, comprising: a plastic molded body having an inner surface and an outer surface, the inner surface defining a hollow space, and extending into the hollow space. And at least one inner wall member having a portion that is joined to and integrated with the inner surface, and the inner wall member further has a pattern display means that can be distinguished from the inner surface. Reform. 21. The pattern display means displays a visually discernible pattern and also displays a game result.
Preform described in 0. 22. The pattern display means is means for visually displaying a pattern, and has an inner wall member having a region in which the material is cut out in the pattern shape. Preform. 23. A blow-molded plastic container having at least a wall surface having an inner surface and an outer surface to define a hollow space, and a portion extending into the hollow space and being integrally connected to the inner surface. A blow-molded plastic container having one inner wall member, and the inner wall member having a pattern display means that can be distinguished from the inner wall. 24. The pattern display means displays a pattern that can be visually discriminated and a game result.
4. The container according to 3. 25. The means for visually displaying the pattern comprises an inner wall member having a region where material is cut out in the pattern.
Preform described in. 26. The container according to claim 23, wherein the color of the inner wall member is different from the color of the wall.