CA2000959C - Blow-molded bottle-shaped container made of synthetic resin - Google Patents
Blow-molded bottle-shaped container made of synthetic resinInfo
- Publication number
- CA2000959C CA2000959C CA002000959A CA2000959A CA2000959C CA 2000959 C CA2000959 C CA 2000959C CA 002000959 A CA002000959 A CA 002000959A CA 2000959 A CA2000959 A CA 2000959A CA 2000959 C CA2000959 C CA 2000959C
- Authority
- CA
- Canada
- Prior art keywords
- container
- circumferential
- circumferential ribs
- blow
- shaped
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/0261—Bottom construction
- B65D1/0276—Bottom construction having a continuous contact surface, e.g. Champagne-type bottom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2501/00—Containers having bodies formed in one piece
- B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
- B65D2501/0018—Ribs
- B65D2501/0036—Hollow circonferential ribs
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
Abstract
A biaxially blow-molded bottle-shaped container having a body with a plurality of longitudinally-extending absorbing panel portions uniformly disposed about a circumference of the body and a lower end of the body between the body and a leg of the body. Two circumferential ribs are provided and externally swelled on the lower end of the body thereby providing a largest diameter of the container; a diameter of the lower end of the body being smaller than the largest diameter. Upper and lower portions of those circumferential ribs comprise rib walls in a form of a tapered wall, and the circumferential ribs each have sufficient vertical height such that, when pressed against an adjacent container, at least a portion of the vertical height of at least one of the circumferential ribs is the only contact with that adjacent container, even if the adjacent container is slightly inclined and is a similarly-shaped article.
Preferably, a circumferential recessed groove having a small width is provided between the circumferential ribs.
Preferably, a circumferential recessed groove having a small width is provided between the circumferential ribs.
Description
CA 020009~9 1998-04-22 BLOW-MOLDED BOTTLE-SHAPED CONTAINER
MADE OF SYNTHETIC RESIN
The present invention relates to a biaxially blow-molded bottle-shaped container made of synthetic resin, and more particularly, to a construction of portions which contact with each other when said bottle-shaped containers are stood upright to be adjacent to each other.
Biaxially blow-molded bottle-shaped containers made of synthetic resin (hereinafter referred to as "blow-molded bottle-shaped containers") such as polyethylene terephthalate resin are typically each filled with contents, sealed by a cap, applied with a label and packed in a corrugated card-board box by a packer, while being transported.
Most of such blow-molded bottle-shaped containers are relatively large. Accordingly, their weight when filled is considerably heavy.
It is desired that a quantity of synthetic resin material required to mold a bottle-shaped container be as small as possible to form a bottle-shaped container at lower cost.
Accordingly, the blow-molded bottle-shaped container is molded by sufficiently orienting a parison. Accordingly, a wall thickness of a body of the bottle-shaped container which forms a main portion of a content receiving portion is very thin.
In a blow-molded bottle-shaped container molded by sufficiently orienting a parison, there cannot always be obtained an uprightness with high accuracy (when a bottle-shaped container .~
CA 020009~9 1998-04-22 is stood upright on a horizontal surface, a larger angle of inclination with respect to a vertical line of a center axis of the container results in poor uprightness of the container)due to an internal strain or the like caused by orientation, and the bottle-shaped container is stood upright in a slightly inclined attitude. Particularly, in the case of a blow-molded bottle-shaped container molded as a heat-resistant bottle-shaped container, the inferiority of the uprightness tends to increase.
Since the blow-molded bottle-shaped container is heavy when it is filled with a content liquid, if the container is slidably moved even on a smooth plane, a considerable sliding resistance occurs. Since the wall thickness of the body which forms a main portion of a bottle-shaped container is thin, when a strong lateral load is applied to the body, it becomes easily depressed and deformed. Since the uprightness of the bottle-shaped container is not good, when a number of blow-molded bottle-shaped containers are arranged to be adjacent to each other in an upright attitude, portions of the body contacted with the adjacent blow-molded bottle-shaped containers are not constant.
Where the bottle-shaped containers are slidably conveyed, the sliding resistance produced between the conveying surface and the blow-molded bottle-shaped container is high. When a number of blow-molded bottle-shaped containers arranged to be adjacent to each other along a constant conveying line are pressed from the back and slidably conveyed on the conveying surface, a great lateral load acts on the body contacted with the adjacent blow-molded bottle-shaped container. The central portion of the body is not always sufficient in mechanical strength with respect to CA 020009~9 1998-04-22 the lateral load. When the high lateral load acts on the central portion of the body, there gives rise to an occurrence of depressed deformation in the central portion of the body.
Furthermore, since the uprightness of the blow-molded bottle-shaped containers is not good, when a plurality of containers placed to be adjacent to each other are pressed and slidably conveyed, the uprightness of each of the blow-molded bottle-shaped containers becomes unstable. Accordingly, an accurate detection of the position of a bottle-shaped container becomes impossible. In some cases, bottle-shaped containers being conveyed fall so that operation should be discontinued.
In a conventional blow-molded bottle-shaped container of this kind,in order to overcome the aforementioned inconveniences, a diameter of a lower portion contacted with a leg is made sufficiently larger than other portions of the body so that when the blow-molded bottle-shaped containers are arranged to be adjacent to each other, the lower end portions of the bodies contact with each other. Since the lower end of the body having a large diameter is close to the leg, the lower end of the body is of relatively high mechanical strength. The lower end of the body receives a lateral load exerted when a plurality of bottle-shaped containers are slidably conveyed. Since the lower end of the body is positioned at the lower end of the blow-molded bottle-shaped container, a moment acting on a blow-molded bottle-shaped container is reduced due to the sliding resistance and the pressing conveying force when the plurality of bottle-shaped containers are slidably conveyed.
As described above, in prior art, the lower end of the body p CA 020009~9 1998-04-22 is made to have a large diameter, and the blow-molded bottle-shaped containers stood upright and arranged to be adjacent to each other are made to contact with each other at their lower ends of the bodies, whereby a number of blow-molded bottle-shaped containers can be slidably conveyed in an upright and stabilized attitude. However, recently, many blow-molded bottle-shaped containers have been subjected to processing such as filling with liquids per unit time.-Therefore, the lateral load acting on the lower end of the body when the containers upright and adjacent to each other are pressed and slidably conveyed becomes more powerful. Accordingly, the mechanical durability of the lower end of the body with respect to the lateral load was required to be increased.
The simplest countermeasure to the aforesaid demand is to sufficiently increase a wall thickness of the lower end of the body. However, when the wall thickness of the lower portion of the body is increased, the quantity of an expensive synthetic resin material required to mold a blow-molded bottle-shaped container increases by said increased portion, resulting in an increase in price of the blow-molded bottle-shaped container. Therefore, this countermeasure is not desirable.
The countermeasure considered to be most effective or prior art which fulfills the aforesaid demand is to control a wall thickness of the container when a blow-molded bottle-shaped container is biaxial blow-molded so that the wall thickness of the lower end of the body is made larger than the wall thickness of other body portions. This conventional means is intended to increase the wall thickness of the lower end of the body to P
CA 020009~9 1998-04-22 thereby increase the mechanical strength of the lower portion of the body. The conventional means can obtain an effect of increasing the mechanical strength of the lower portion of the body. However, the wall thickness of the other portions of the body is to be reduced by a portion having increased wall thickness of the lower portion of the body. Because of this, there gives rise to an important problem of considerably lowering fundamental functions of the blow-molded bottle-like container as a container, such as durability of the body with respect to the lateral load, durability of other body portions with respect to the lateral load, shape stability of the body with respect to a gripping force during handling, constantness and stability of pressure reduction absorbing deformation in a heat resistant bottle-shaped container, and the like.
A principal object of the present invention is to considerably increase the mechanical strength with respect to a lateral load at a lower portion of a body of a container without reducing a wall thickness of other portions of the body and without increasing the amount of synthetic resin material required to mold a bottle-shaped container.
The present invention provides a biaxially blow-molded bottle-shaped container having a body with a plurality of longitudinally-extending absorbing panel portions uniformly disposed about a circumference of the body and a lower end of the body between the body and a leg of the body.
Two circumferential ribs are provided and externally swelled on the lower end of the body thereby providing a largest diameter of the container; a diameter of the lower Ç~
CA 020009~9 1998-04-22 end of the body being smaller than the largest diameter.
Upper and lower portions of those circumferential ribs comprise rib walls in a form of a tapered wall, and the circumferential ribs each have sufficient vertical height such that, when pressed against an adjacent container, at least a portion of the vertical height of at least one of the circumferential ribs is the only contact with the adjacent container, even if the adjacent container is slightly inclined and is a similarly-shaped article.
Preferably, a circumferential recessed groove having a small width is provided between the circumferential ribs.
In a particularly preferred embodiment a diameter of the upper end of the body is equal to that of the lower end of the body, a circumferential rib is provided and externally swelled on the upper end of the body, and upper and lower portions of the circumferential rib comprise rib walls in the form of a tapered wall. In this embodiment at least two circumferential ribs may be provided in parallel on the upper end of the body, and a circumferential recessed groove having a small width is provided between the circumferential ribs.
A "main portion of a body" refers to a portion which has a function to receive and hold a content liquid. For example, in the case of a heat-resistant bottle-shaped container, the "main portion of the body" is a body portion formed with an absorbing panel wall for absorbing reduced-pressure in the container. In a general concept, the "main portion of the body" is a portion having a substantially uniform diameter, other than a shoulder and a bottom including the leg.
CA 020009~9 1998-04-22 The present invention is not limited to providing a single circumferential rib. A circumferential recessed groove having a small groove width (a sufficiently smaller groove width than a longitudinal width of a circumferential rib) may be interposed between circumferential ribs so that two or more circumferential ribs are disposed in parallel.
The circumferential rib is inflated from the lower end of the body. Accordingly, the circumferential ribs of adjacent containers contact with each other so that the blow-molded bottle-shaped containers are stood upright adjacent to each other. A pressing force for press-conveyance acting on an upstream blow-molded bottle-shaped contAiner to an adjacent blow-molded bottle-shaped container during slidable conveyance of blow-molded bottle-shaped containers directly acts on the circumferential rib.
Since the circumferential rib adapted to directly receive the pressing force from the adjacent blow-molded bottle-shaped - 6a -,~
CA 020009~9 1998-04-22 container is designed to have upper and lower rib walls in the form of a tapered wall, rib walls act as a reinforcing rib.
Accordingly, the pressing force exerted from the adjacent blow-molded bottle-shaped container is received by the sufficient mechanical strength to considerably increase the mechanical durability with respect to the lateral load of the whole lower end of the body.
In the case where two or more circumferential ribs are disposed in parallel, the number of rib walls serving as the reinforcing rib increases, and the mechanical durability with respect to the lateral load at the lower end of the body can be increased.
The reason why the width of the circumferential recessed groove positioned between the circumferential ribs where the plurality of circumferential ribs are disposed in parallel is to prevent a circumferential rib of a blow-molded bottle-shaped container from being moved onto a circumferential rib of the adjacent blow-molded bottle-shaped container to greatly incline the other blow-molded bottle-shaped container during conveyance.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a front view of a polyethylene terephthalate bottle-shaped container applied to work out first and second embodiments of the present invention;
Fig. 2 is a view showing a contour line of essential parts of the first embodiment of the present invention in an enlarged longitudinal section;
Fig. 3 is a view showing a contour line of essential parts of the second embodiment of the present invention in an enlarged '~ ' .
CA 020009~9 1998-04-22 wall.
In Fig. 2, the broken line indicates a contour line of prior art. The circumferential rib 5 of the present invention is not formed as a part of a curved surface smoothly continuous to the outer circumferential surface of the lower end 4 of the body as in prior art. In the circumferential rib 5 of the present invention, the largest diameter portion is the circumferential rib 5, and the diameter of portions of the lower end 4 other than the circumferential rib 5 is redu-ced. The circumferential rib 5 in the first embodiment of the present invention has a relative large height. The reason why the circumferential rib 5 is formed by leaving the largest diameter portion of the lower end 4 of the body in prior art is to prevent the diameter of the lower portion 4 of the body from being increased more than as needed by the provision of the circumferential rib 5. The reason why the height of the circumferential rib 5 is relatively large is because the pressed adjacent containers 1 are always placed in contact with each other at the circumferential ribs 5 even if the upright attitude is slightly inclined.
In the first embodiment shown in Fig. 2, when a lateral load of 5 Kg was applied to the container, a distortion of the lower end 4 of the body in a radial direction was 1.20 mm. On the other hand, when a lateral load of 5 Kg was applied or a container not provided with the circumferential rib 5 at the lower end 4 of the body, a distortion of the lower end 4 of the body in a radial direction was 1.50 mm. According to the first embodiment of the present invention, the distortion of the lower end 4 of the body CA 020009~9 1998-04-22 in a radial direction can be considerably reduced and an occurrence of buckling deformation can be completely eliminated.
Fig. 3 shows a second embodiment in which two circumferential ribs 5 are provided in parallel. A height of each circumferential rib 5 is smaller than that of the circumferential rib 5 shown in Fig. 2. However, the sum of the height of both the circumferential ribs 5 is larger than the height of the circumferential rib in the first embodiment shown in Fig. 2.
The test for lateral load was conducted with respect to the container in the second embodiment shown in Fig. 3 under the same conditions as noted above. The distortion of the lower end 4 of the body in a radial direction was 1.09 to 1.12 mm, and the distortion can be further considerably reduced, and the occurrence of the buckling deformation can be completely eliminated.
The wall thickness of the lower end 4 controlled by the wall thickness controlling means was 0.55 mm which is larger by 0.15 mm than that of the container 1 according to the present invention. When the aforementioned lateral load test was conducted with respect to this container, the distortion of the lower end of the body in a radial direction was 1.13 mm, and thus the container exhibits an excellent durability. However, as previously mentioned, since the wall thickness of the body 2 other than the lower end 4 is small, the function of the container as a whole was deteriorated.
Next, the third embodiment of the present invention will be described. In the third embodiment, largest diameter portions of a biaxially blow-molded bottle-shaped container made of synthetic CA 020009~9 1998-04-22 resin include an upper end of a body which is an upper end of the main portion of the body and a lower end of a body connecting with a leg of the body. The diameter of the upper end of the body is equal to that of the lower end of the body. Both the upper and lower ends of the body are circumferentially provided with circumferential ribs, respectively.
As described above, two circumferential ribs are provided on the upper and lower portions of the body. Accordingly, the pressing force for conveyance acting on a container from the adjacent container is divided into upper and lower portions.
Because of this, a lateral load acting on a single circumferential rib is reduced by half, and therefore, the mechanical durability with respect to high lateral load of the container as a whole is exhibited.
Circumferential ribs having the largest diameter are positioned at both the upper and lower ends of the main portion of the body. Accordingly, when containers are pressed and placed to be adjacent to each other, the containers are pressed and contacted with each other at both upper and lower circumferential ribs. Portions of the body other than the circumferential rib which are weak with respect to the lateral load are positively prevented from being directly pressed so that said portions are depressed and deformed. The adjacent containers are pressed and contacted with each other at both the upper and lower circumferential ribs. Accordingly, even if there is a container which is poor in uprightness, the container is supported at four points by adjacent containers, and therefore, the upright attitude of each container during pressing and slidable conveyance can be held at CA 020009~9 1998-04-22 that of the circumferential rib 5 shown in Fig. 2. However, the sum of the height of both the circumferential ribs 5 are larger than that of the circumferential rib 5 in the third mode of embodiment.
The lateral load test was conducted under the same conditions as noted above with respect to the container according to the fourth embodiment. The distortion of the lower end 4 of the body in a radial direction was 0.54 to 0.56 mm. The distortion can be further considerably reduced and the occurrence of buckling deformation was completely eliminated.
The containers according to the present invention have the construction as described above, and provide the following effects.
The circumferential rib acts as a reinforcing rib.
Accordingly, the mechanical durability of the lower end of the body (and the upper end of the body) with respect to the lateral load can be considerably increased. Accordingly, the occurrence of buckling deformation of the lower end of the body (and the upper end of the body) when the container is pressed and slidably conveyed can be prevented.
The circumferential rib is formed and externally swelled by bending a wall having a substantially same wall thickness as the lower end of the body (and the upper end of the body).
Accordingly, it is not necessary to increase the wall thickness of the lower end of the body (and the upper end of the body) partially to be projected. Accordingly, there occurs no inconvenience that the wall thickness of the other portions of the body of the container is reduced so as to lower the CA 020009~9 1998-04-22 fundamental function of the container as a container. Since it is not necessary that synthetic resin material be further added to partially increase the wall thickness of the lower end of the body (and the upper end of the body), the unit price of containers is not increased due to an increase in material cost for molding containers.
Since a container can be molded with a uniform wall thickness of a body of the container, the wall thickness controlling means is not required. Accordingly, the molding operation for the container is simple.
Portions to be contacted with the adjacent container are specified by the circumferential ribs. Accordingly, the mode of transmission of the pressing force as the conveying force of the containers is constant, whereby the upright attitude of the containers pressed and slidably conveyed is stabilized.
MADE OF SYNTHETIC RESIN
The present invention relates to a biaxially blow-molded bottle-shaped container made of synthetic resin, and more particularly, to a construction of portions which contact with each other when said bottle-shaped containers are stood upright to be adjacent to each other.
Biaxially blow-molded bottle-shaped containers made of synthetic resin (hereinafter referred to as "blow-molded bottle-shaped containers") such as polyethylene terephthalate resin are typically each filled with contents, sealed by a cap, applied with a label and packed in a corrugated card-board box by a packer, while being transported.
Most of such blow-molded bottle-shaped containers are relatively large. Accordingly, their weight when filled is considerably heavy.
It is desired that a quantity of synthetic resin material required to mold a bottle-shaped container be as small as possible to form a bottle-shaped container at lower cost.
Accordingly, the blow-molded bottle-shaped container is molded by sufficiently orienting a parison. Accordingly, a wall thickness of a body of the bottle-shaped container which forms a main portion of a content receiving portion is very thin.
In a blow-molded bottle-shaped container molded by sufficiently orienting a parison, there cannot always be obtained an uprightness with high accuracy (when a bottle-shaped container .~
CA 020009~9 1998-04-22 is stood upright on a horizontal surface, a larger angle of inclination with respect to a vertical line of a center axis of the container results in poor uprightness of the container)due to an internal strain or the like caused by orientation, and the bottle-shaped container is stood upright in a slightly inclined attitude. Particularly, in the case of a blow-molded bottle-shaped container molded as a heat-resistant bottle-shaped container, the inferiority of the uprightness tends to increase.
Since the blow-molded bottle-shaped container is heavy when it is filled with a content liquid, if the container is slidably moved even on a smooth plane, a considerable sliding resistance occurs. Since the wall thickness of the body which forms a main portion of a bottle-shaped container is thin, when a strong lateral load is applied to the body, it becomes easily depressed and deformed. Since the uprightness of the bottle-shaped container is not good, when a number of blow-molded bottle-shaped containers are arranged to be adjacent to each other in an upright attitude, portions of the body contacted with the adjacent blow-molded bottle-shaped containers are not constant.
Where the bottle-shaped containers are slidably conveyed, the sliding resistance produced between the conveying surface and the blow-molded bottle-shaped container is high. When a number of blow-molded bottle-shaped containers arranged to be adjacent to each other along a constant conveying line are pressed from the back and slidably conveyed on the conveying surface, a great lateral load acts on the body contacted with the adjacent blow-molded bottle-shaped container. The central portion of the body is not always sufficient in mechanical strength with respect to CA 020009~9 1998-04-22 the lateral load. When the high lateral load acts on the central portion of the body, there gives rise to an occurrence of depressed deformation in the central portion of the body.
Furthermore, since the uprightness of the blow-molded bottle-shaped containers is not good, when a plurality of containers placed to be adjacent to each other are pressed and slidably conveyed, the uprightness of each of the blow-molded bottle-shaped containers becomes unstable. Accordingly, an accurate detection of the position of a bottle-shaped container becomes impossible. In some cases, bottle-shaped containers being conveyed fall so that operation should be discontinued.
In a conventional blow-molded bottle-shaped container of this kind,in order to overcome the aforementioned inconveniences, a diameter of a lower portion contacted with a leg is made sufficiently larger than other portions of the body so that when the blow-molded bottle-shaped containers are arranged to be adjacent to each other, the lower end portions of the bodies contact with each other. Since the lower end of the body having a large diameter is close to the leg, the lower end of the body is of relatively high mechanical strength. The lower end of the body receives a lateral load exerted when a plurality of bottle-shaped containers are slidably conveyed. Since the lower end of the body is positioned at the lower end of the blow-molded bottle-shaped container, a moment acting on a blow-molded bottle-shaped container is reduced due to the sliding resistance and the pressing conveying force when the plurality of bottle-shaped containers are slidably conveyed.
As described above, in prior art, the lower end of the body p CA 020009~9 1998-04-22 is made to have a large diameter, and the blow-molded bottle-shaped containers stood upright and arranged to be adjacent to each other are made to contact with each other at their lower ends of the bodies, whereby a number of blow-molded bottle-shaped containers can be slidably conveyed in an upright and stabilized attitude. However, recently, many blow-molded bottle-shaped containers have been subjected to processing such as filling with liquids per unit time.-Therefore, the lateral load acting on the lower end of the body when the containers upright and adjacent to each other are pressed and slidably conveyed becomes more powerful. Accordingly, the mechanical durability of the lower end of the body with respect to the lateral load was required to be increased.
The simplest countermeasure to the aforesaid demand is to sufficiently increase a wall thickness of the lower end of the body. However, when the wall thickness of the lower portion of the body is increased, the quantity of an expensive synthetic resin material required to mold a blow-molded bottle-shaped container increases by said increased portion, resulting in an increase in price of the blow-molded bottle-shaped container. Therefore, this countermeasure is not desirable.
The countermeasure considered to be most effective or prior art which fulfills the aforesaid demand is to control a wall thickness of the container when a blow-molded bottle-shaped container is biaxial blow-molded so that the wall thickness of the lower end of the body is made larger than the wall thickness of other body portions. This conventional means is intended to increase the wall thickness of the lower end of the body to P
CA 020009~9 1998-04-22 thereby increase the mechanical strength of the lower portion of the body. The conventional means can obtain an effect of increasing the mechanical strength of the lower portion of the body. However, the wall thickness of the other portions of the body is to be reduced by a portion having increased wall thickness of the lower portion of the body. Because of this, there gives rise to an important problem of considerably lowering fundamental functions of the blow-molded bottle-like container as a container, such as durability of the body with respect to the lateral load, durability of other body portions with respect to the lateral load, shape stability of the body with respect to a gripping force during handling, constantness and stability of pressure reduction absorbing deformation in a heat resistant bottle-shaped container, and the like.
A principal object of the present invention is to considerably increase the mechanical strength with respect to a lateral load at a lower portion of a body of a container without reducing a wall thickness of other portions of the body and without increasing the amount of synthetic resin material required to mold a bottle-shaped container.
The present invention provides a biaxially blow-molded bottle-shaped container having a body with a plurality of longitudinally-extending absorbing panel portions uniformly disposed about a circumference of the body and a lower end of the body between the body and a leg of the body.
Two circumferential ribs are provided and externally swelled on the lower end of the body thereby providing a largest diameter of the container; a diameter of the lower Ç~
CA 020009~9 1998-04-22 end of the body being smaller than the largest diameter.
Upper and lower portions of those circumferential ribs comprise rib walls in a form of a tapered wall, and the circumferential ribs each have sufficient vertical height such that, when pressed against an adjacent container, at least a portion of the vertical height of at least one of the circumferential ribs is the only contact with the adjacent container, even if the adjacent container is slightly inclined and is a similarly-shaped article.
Preferably, a circumferential recessed groove having a small width is provided between the circumferential ribs.
In a particularly preferred embodiment a diameter of the upper end of the body is equal to that of the lower end of the body, a circumferential rib is provided and externally swelled on the upper end of the body, and upper and lower portions of the circumferential rib comprise rib walls in the form of a tapered wall. In this embodiment at least two circumferential ribs may be provided in parallel on the upper end of the body, and a circumferential recessed groove having a small width is provided between the circumferential ribs.
A "main portion of a body" refers to a portion which has a function to receive and hold a content liquid. For example, in the case of a heat-resistant bottle-shaped container, the "main portion of the body" is a body portion formed with an absorbing panel wall for absorbing reduced-pressure in the container. In a general concept, the "main portion of the body" is a portion having a substantially uniform diameter, other than a shoulder and a bottom including the leg.
CA 020009~9 1998-04-22 The present invention is not limited to providing a single circumferential rib. A circumferential recessed groove having a small groove width (a sufficiently smaller groove width than a longitudinal width of a circumferential rib) may be interposed between circumferential ribs so that two or more circumferential ribs are disposed in parallel.
The circumferential rib is inflated from the lower end of the body. Accordingly, the circumferential ribs of adjacent containers contact with each other so that the blow-molded bottle-shaped containers are stood upright adjacent to each other. A pressing force for press-conveyance acting on an upstream blow-molded bottle-shaped contAiner to an adjacent blow-molded bottle-shaped container during slidable conveyance of blow-molded bottle-shaped containers directly acts on the circumferential rib.
Since the circumferential rib adapted to directly receive the pressing force from the adjacent blow-molded bottle-shaped - 6a -,~
CA 020009~9 1998-04-22 container is designed to have upper and lower rib walls in the form of a tapered wall, rib walls act as a reinforcing rib.
Accordingly, the pressing force exerted from the adjacent blow-molded bottle-shaped container is received by the sufficient mechanical strength to considerably increase the mechanical durability with respect to the lateral load of the whole lower end of the body.
In the case where two or more circumferential ribs are disposed in parallel, the number of rib walls serving as the reinforcing rib increases, and the mechanical durability with respect to the lateral load at the lower end of the body can be increased.
The reason why the width of the circumferential recessed groove positioned between the circumferential ribs where the plurality of circumferential ribs are disposed in parallel is to prevent a circumferential rib of a blow-molded bottle-shaped container from being moved onto a circumferential rib of the adjacent blow-molded bottle-shaped container to greatly incline the other blow-molded bottle-shaped container during conveyance.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a front view of a polyethylene terephthalate bottle-shaped container applied to work out first and second embodiments of the present invention;
Fig. 2 is a view showing a contour line of essential parts of the first embodiment of the present invention in an enlarged longitudinal section;
Fig. 3 is a view showing a contour line of essential parts of the second embodiment of the present invention in an enlarged '~ ' .
CA 020009~9 1998-04-22 wall.
In Fig. 2, the broken line indicates a contour line of prior art. The circumferential rib 5 of the present invention is not formed as a part of a curved surface smoothly continuous to the outer circumferential surface of the lower end 4 of the body as in prior art. In the circumferential rib 5 of the present invention, the largest diameter portion is the circumferential rib 5, and the diameter of portions of the lower end 4 other than the circumferential rib 5 is redu-ced. The circumferential rib 5 in the first embodiment of the present invention has a relative large height. The reason why the circumferential rib 5 is formed by leaving the largest diameter portion of the lower end 4 of the body in prior art is to prevent the diameter of the lower portion 4 of the body from being increased more than as needed by the provision of the circumferential rib 5. The reason why the height of the circumferential rib 5 is relatively large is because the pressed adjacent containers 1 are always placed in contact with each other at the circumferential ribs 5 even if the upright attitude is slightly inclined.
In the first embodiment shown in Fig. 2, when a lateral load of 5 Kg was applied to the container, a distortion of the lower end 4 of the body in a radial direction was 1.20 mm. On the other hand, when a lateral load of 5 Kg was applied or a container not provided with the circumferential rib 5 at the lower end 4 of the body, a distortion of the lower end 4 of the body in a radial direction was 1.50 mm. According to the first embodiment of the present invention, the distortion of the lower end 4 of the body CA 020009~9 1998-04-22 in a radial direction can be considerably reduced and an occurrence of buckling deformation can be completely eliminated.
Fig. 3 shows a second embodiment in which two circumferential ribs 5 are provided in parallel. A height of each circumferential rib 5 is smaller than that of the circumferential rib 5 shown in Fig. 2. However, the sum of the height of both the circumferential ribs 5 is larger than the height of the circumferential rib in the first embodiment shown in Fig. 2.
The test for lateral load was conducted with respect to the container in the second embodiment shown in Fig. 3 under the same conditions as noted above. The distortion of the lower end 4 of the body in a radial direction was 1.09 to 1.12 mm, and the distortion can be further considerably reduced, and the occurrence of the buckling deformation can be completely eliminated.
The wall thickness of the lower end 4 controlled by the wall thickness controlling means was 0.55 mm which is larger by 0.15 mm than that of the container 1 according to the present invention. When the aforementioned lateral load test was conducted with respect to this container, the distortion of the lower end of the body in a radial direction was 1.13 mm, and thus the container exhibits an excellent durability. However, as previously mentioned, since the wall thickness of the body 2 other than the lower end 4 is small, the function of the container as a whole was deteriorated.
Next, the third embodiment of the present invention will be described. In the third embodiment, largest diameter portions of a biaxially blow-molded bottle-shaped container made of synthetic CA 020009~9 1998-04-22 resin include an upper end of a body which is an upper end of the main portion of the body and a lower end of a body connecting with a leg of the body. The diameter of the upper end of the body is equal to that of the lower end of the body. Both the upper and lower ends of the body are circumferentially provided with circumferential ribs, respectively.
As described above, two circumferential ribs are provided on the upper and lower portions of the body. Accordingly, the pressing force for conveyance acting on a container from the adjacent container is divided into upper and lower portions.
Because of this, a lateral load acting on a single circumferential rib is reduced by half, and therefore, the mechanical durability with respect to high lateral load of the container as a whole is exhibited.
Circumferential ribs having the largest diameter are positioned at both the upper and lower ends of the main portion of the body. Accordingly, when containers are pressed and placed to be adjacent to each other, the containers are pressed and contacted with each other at both upper and lower circumferential ribs. Portions of the body other than the circumferential rib which are weak with respect to the lateral load are positively prevented from being directly pressed so that said portions are depressed and deformed. The adjacent containers are pressed and contacted with each other at both the upper and lower circumferential ribs. Accordingly, even if there is a container which is poor in uprightness, the container is supported at four points by adjacent containers, and therefore, the upright attitude of each container during pressing and slidable conveyance can be held at CA 020009~9 1998-04-22 that of the circumferential rib 5 shown in Fig. 2. However, the sum of the height of both the circumferential ribs 5 are larger than that of the circumferential rib 5 in the third mode of embodiment.
The lateral load test was conducted under the same conditions as noted above with respect to the container according to the fourth embodiment. The distortion of the lower end 4 of the body in a radial direction was 0.54 to 0.56 mm. The distortion can be further considerably reduced and the occurrence of buckling deformation was completely eliminated.
The containers according to the present invention have the construction as described above, and provide the following effects.
The circumferential rib acts as a reinforcing rib.
Accordingly, the mechanical durability of the lower end of the body (and the upper end of the body) with respect to the lateral load can be considerably increased. Accordingly, the occurrence of buckling deformation of the lower end of the body (and the upper end of the body) when the container is pressed and slidably conveyed can be prevented.
The circumferential rib is formed and externally swelled by bending a wall having a substantially same wall thickness as the lower end of the body (and the upper end of the body).
Accordingly, it is not necessary to increase the wall thickness of the lower end of the body (and the upper end of the body) partially to be projected. Accordingly, there occurs no inconvenience that the wall thickness of the other portions of the body of the container is reduced so as to lower the CA 020009~9 1998-04-22 fundamental function of the container as a container. Since it is not necessary that synthetic resin material be further added to partially increase the wall thickness of the lower end of the body (and the upper end of the body), the unit price of containers is not increased due to an increase in material cost for molding containers.
Since a container can be molded with a uniform wall thickness of a body of the container, the wall thickness controlling means is not required. Accordingly, the molding operation for the container is simple.
Portions to be contacted with the adjacent container are specified by the circumferential ribs. Accordingly, the mode of transmission of the pressing force as the conveying force of the containers is constant, whereby the upright attitude of the containers pressed and slidably conveyed is stabilized.
Claims (5)
1. A biaxially blow-molded bottle-shaped container, comprising a body with a plurality of longitudinally-extending absorbing panel portions uniformly disposed about a circumference of the body and a lower end of the body between the body and a leg of the body, wherein:
two circumferential ribs are provided and externally swelled on the lower end of the body thereby providing a largest diameter of the container, a diameter of said lower end of the body being smaller than the largest diameter;
upper and lower portions of the circumferential ribs comprise rib walls in a form of a tapered wall; and said two circumferential ribs each have sufficient vertical height such that, when pressed against an adjacent container, at least a portion of the vertical height of at least one of the circumferential ribs is the only contact with said adjacent container, even if said adjacent container is slightly inclined and is a similarly-shaped article.
two circumferential ribs are provided and externally swelled on the lower end of the body thereby providing a largest diameter of the container, a diameter of said lower end of the body being smaller than the largest diameter;
upper and lower portions of the circumferential ribs comprise rib walls in a form of a tapered wall; and said two circumferential ribs each have sufficient vertical height such that, when pressed against an adjacent container, at least a portion of the vertical height of at least one of the circumferential ribs is the only contact with said adjacent container, even if said adjacent container is slightly inclined and is a similarly-shaped article.
2. The container according to claim 1, wherein a circumferential recessed groove having a small width is provided between said circumferential ribs.
3. The container according to claim 1 or 2, wherein:
a diameter of the upper end of the body is equal to that of the lower end of the body;
a circumferential rib is provided and externally swelled on the upper end of the body; and upper and lower portions of the circumferential rib comprise rib walls in the form of a tapered wall.
a diameter of the upper end of the body is equal to that of the lower end of the body;
a circumferential rib is provided and externally swelled on the upper end of the body; and upper and lower portions of the circumferential rib comprise rib walls in the form of a tapered wall.
4. The container according to claim 3, wherein at least two circumferential ribs are provided in parallel on the upper end of the body, and a circumferential recessed groove having a small width is provided between the circumferential ribs.
5. The container according to any one of claims 1 to 4, wherein said bottle-shaped container is made of a synthetic resin.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN89107811.8A CN1022900C (en) | 1989-10-07 | 1989-10-07 | Elongation moulding pot made from synthetic resin |
| AU42930/89A AU635900B2 (en) | 1989-10-07 | 1989-10-16 | Blow-molded bottle-shaped container made of synthetic resin |
| DE68916429T DE68916429T2 (en) | 1989-10-07 | 1989-10-18 | Blow-molded bottle-shaped plastic container. |
| EP89310710A EP0423406B1 (en) | 1989-10-07 | 1989-10-18 | Blow-moulded bottle-shaped container made of synthetic resin |
| AT89310710T ATE107593T1 (en) | 1989-10-07 | 1989-10-18 | BLOW MOLDED PLASTIC BOTTLE CONTAINER. |
| CA002000959A CA2000959C (en) | 1989-10-07 | 1989-10-18 | Blow-molded bottle-shaped container made of synthetic resin |
| ES89310710T ES2055091T3 (en) | 1989-10-07 | 1989-10-18 | VASE IN THE FORM OF A BIAXIALALLY MOLDED BOTTLE BY BLOWING. |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN89107811.8A CN1022900C (en) | 1989-10-07 | 1989-10-07 | Elongation moulding pot made from synthetic resin |
| AU42930/89A AU635900B2 (en) | 1989-10-07 | 1989-10-16 | Blow-molded bottle-shaped container made of synthetic resin |
| EP89310710A EP0423406B1 (en) | 1989-10-07 | 1989-10-18 | Blow-moulded bottle-shaped container made of synthetic resin |
| CA002000959A CA2000959C (en) | 1989-10-07 | 1989-10-18 | Blow-molded bottle-shaped container made of synthetic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2000959A1 CA2000959A1 (en) | 1991-04-18 |
| CA2000959C true CA2000959C (en) | 1999-01-12 |
Family
ID=27423218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002000959A Expired - Lifetime CA2000959C (en) | 1989-10-07 | 1989-10-18 | Blow-molded bottle-shaped container made of synthetic resin |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0423406B1 (en) |
| CN (1) | CN1022900C (en) |
| AT (1) | ATE107593T1 (en) |
| AU (1) | AU635900B2 (en) |
| CA (1) | CA2000959C (en) |
| DE (1) | DE68916429T2 (en) |
| ES (1) | ES2055091T3 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0644806Y2 (en) * | 1989-07-10 | 1994-11-16 | 株式会社吉野工業所 | Bottle made of synthetic resin |
| DE68919710T2 (en) * | 1989-09-29 | 1995-04-06 | Yoshino Kogyosho Co Ltd | BIAXIAL STRETCHED, BLOW-SHAPED BOTTLE. |
| US5383558A (en) * | 1992-09-11 | 1995-01-24 | Kraft General Foods, Inc. | Sealed container |
| US5337909A (en) * | 1993-02-12 | 1994-08-16 | Hoover Universal, Inc. | Hot fill plastic container having a radial reinforcement rib |
| NZ250854A (en) * | 1993-02-18 | 1995-07-26 | Continental Pet Technologies | Squeezable dent-resistant plastics container with vertical recesses between panels and posts having flex points and steps to inhibit permanent deformation |
| US5341946A (en) * | 1993-03-26 | 1994-08-30 | Hoover Universal, Inc. | Hot fill plastic container having reinforced pressure absorption panels |
| AU1495395A (en) * | 1994-04-29 | 1995-11-09 | Constar Plastics Inc. | Plastic bottle having enhanced sculptured surface appearance |
| US5971184A (en) * | 1997-10-28 | 1999-10-26 | Continental Pet Technologies, Inc. | Hot-fillable plastic container with grippable body |
| US6260722B1 (en) | 1999-12-29 | 2001-07-17 | Phoenix Closures, Inc. | Cap and container assembly |
| US6257432B1 (en) | 1999-12-29 | 2001-07-10 | Phoenix Closures, Inc. | Cap and container assembly |
| US7172087B1 (en) | 2003-09-17 | 2007-02-06 | Graham Packaging Company, Lp | Squeezable container and method of manufacture |
| KR101562678B1 (en) * | 2008-02-29 | 2015-10-23 | 가부시키가이샤 요시노 고교쇼 | Blow-molded container and molding method thereof |
| US9981768B1 (en) * | 2016-09-02 | 2018-05-29 | Milacron Llc | Container and method of manufacturing the same |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH386268A (en) * | 1961-07-19 | 1964-12-31 | Stockar Georg Klaus Dipl Ing C | Containers, in particular bottles, made of polyethylene |
| GB1074162A (en) * | 1965-03-10 | 1967-06-28 | Metal Box Co Ltd | Improvements in or relating to bottles made of synthetic thermoplastic material |
| JPS6128736Y2 (en) * | 1978-07-10 | 1986-08-26 | ||
| DE3215866A1 (en) * | 1982-04-29 | 1983-11-03 | Seltmann, Hans-Jürgen, 2000 Hamburg | Design of plastic containers for compensating pressure variations whilst retaining good stability |
| EP0506065B1 (en) * | 1987-02-17 | 1995-01-25 | Yoshino Kogyosho Co., Ltd. | Pressure resistant bottle-shaped container |
| US4894268A (en) * | 1987-12-07 | 1990-01-16 | Sonoco Products Company | Stretch blow-molded polyethylene terephthalate wide mouth container and intermediate article |
-
1989
- 1989-10-07 CN CN89107811.8A patent/CN1022900C/en not_active Expired - Lifetime
- 1989-10-16 AU AU42930/89A patent/AU635900B2/en not_active Ceased
- 1989-10-18 EP EP89310710A patent/EP0423406B1/en not_active Expired - Lifetime
- 1989-10-18 DE DE68916429T patent/DE68916429T2/en not_active Expired - Fee Related
- 1989-10-18 ES ES89310710T patent/ES2055091T3/en not_active Expired - Lifetime
- 1989-10-18 AT AT89310710T patent/ATE107593T1/en not_active IP Right Cessation
- 1989-10-18 CA CA002000959A patent/CA2000959C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE68916429D1 (en) | 1994-07-28 |
| DE68916429T2 (en) | 1994-10-20 |
| EP0423406B1 (en) | 1994-06-22 |
| CN1050853A (en) | 1991-04-24 |
| AU4293089A (en) | 1991-06-06 |
| AU635900B2 (en) | 1993-04-08 |
| ATE107593T1 (en) | 1994-07-15 |
| EP0423406A1 (en) | 1991-04-24 |
| ES2055091T3 (en) | 1994-08-16 |
| CN1022900C (en) | 1993-12-01 |
| CA2000959A1 (en) | 1991-04-18 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |