GB2030953A – Composite containers
– Google Patents
GB2030953A – Composite containers
– Google Patents
Composite containers
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Info
Publication number
GB2030953A
GB2030953A
GB7838426A
GB7838426A
GB2030953A
GB 2030953 A
GB2030953 A
GB 2030953A
GB 7838426 A
GB7838426 A
GB 7838426A
GB 7838426 A
GB7838426 A
GB 7838426A
GB 2030953 A
GB2030953 A
GB 2030953A
Authority
GB
United Kingdom
Prior art keywords
wall
curl
strength
area
reduced
Prior art date
1978-09-27
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.)
Granted
Application number
GB7838426A
Other versions
GB2030953B
(en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crown Packaging UK Ltd
Original Assignee
Metal Box PLC
Priority date (The priority date 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 date listed.)
1978-09-27
Filing date
1978-09-27
Publication date
1980-04-16
1978-09-27
Application filed by Metal Box PLC
filed
Critical
Metal Box PLC
1978-09-27
Priority to GB7838426A
priority
Critical
patent/GB2030953B/en
1979-09-10
Priority to ZA00794776A
priority
patent/ZA794776B/en
1979-09-27
Priority to FR7924031A
priority
patent/FR2437294A1/en
1980-04-16
Publication of GB2030953A
publication
Critical
patent/GB2030953A/en
1983-05-05
Application granted
granted
Critical
1983-05-05
Publication of GB2030953B
publication
Critical
patent/GB2030953B/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
B—PERFORMING OPERATIONS; TRANSPORTING
B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
B29C57/12—Rim rolling
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
B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
B65D3/22—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated material
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
B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
B65D3/28—Other details of walls
B—PERFORMING OPERATIONS; TRANSPORTING
B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
B31B50/25—Surface scoring
B31B50/252—Surface scoring using presses or dies
Abstract
A tubular body for a composite container, having a wall body, the strength of the wall in an area extending around and adjacent one end of the body wall being reduced without removal of material therefrom, and a curl being formed at said one end, a substantial part of the curl including said wall area of reduced strength. In the preferred embodiment the body wall is of fibrous material and the reduction of strength is achieved by indenting at 12 around a plurality of parallel lines adjacent the end of the body. A diaphragm may be bonded across the end of the body and onto the outside of the curl. The reduction of the strength of the end of the body wall enables the curl to be formed with less pressure from a forming tool and hence less likelihood of the tube collapsing during curl formation. Also, the likelihood of the curl formation process splitting a liquid-proof lining which may be provided on the inside of the wall is reduced. The tubular body may be made of plastics material and the reduction of strength effected by partial cutting through the tube wall or by crushing.
Description
SPECIFICATION
Composite containers
This invention relates to forming a curl around the end of a tubular body for a composite container. The wall of the body may comprise fibrous material, if desired having an inner lining layer of any suitable material, and an outer label layer of a suitable material. The fibrous material may for example be paperboard or cardboard.
Alternatively the body wall may be of plastics material.
A method frequently employed for forming a curl at one end of such a tubular body involves supporting the body from the other end and driving a suitably formed press tool towards and onto the one end of the body, the press tool being so shaped that it will then cause the end of the body to roll over into a curl, either inwardly or outwardly, as desired.
This operation imposes a substantial axial force on the body which is sufficient in some cases to cause the body to collapse, which of course
requires it to be rejected.
A further problem which arises, particularly in the formation of an outward curl, is that splits
may occur on the outside of the curl. This occurs with fibrous material if the material is too dry, thus
necessitating rather close control of its moisture
content, and if it is attempted to form too large a curl. The problem can in principle be reduced by forming a smaller curl but in practice this requires the application of a greater force by the press tool
and consequently increases the chance of the tube
collapsing during the press operation. Splitting
can also occur when the body wall is of plastics
material; and also when an alternative curlforming method using a rotary wheel is used.
Splits occurring on the outside of the curl are particularly disadvantageous when a diaphragm is
to be sealed across the curled end of the
composite container, because they result in a
faulty seal between the diaphragm and the curl.
Also, if a fibrous-bodied container is to contain a
liquid, thus requiring a liquid-proof inner lining
layer, the splitting will occur in this layer, and
may permit undesired seepage of the liquid into
the fibrous wall material of the body.
According to the present invention there is
provided a tubular body for a composite container,
having a body wall, the strength of the wall in an
area extending around and adjacent one end of
the body wall being reduced without removal of
material therefrom, and a curl being formed at said
one end, a substantial part of the curl including
said wall area of reduced strength.
Any given size of curl can be formed in this way
by placing less axial force on the tubular body
from a press tool, and consequently the risk of the
tube collapsing is reduced. Also, because the axial
force required is reduced, there is a greater
tolerance to variations in the moisture content in
the case of a fibrous material tube wall.
Additionally, a smaller curl, which is generally
considered to be desirable for aesthetic and practical reasons, can be produced for any given value of axial force applied by the press tool to the tubular body, and hence it is possible to produce curls of a reduced size without increasing the
likelihood of tube collapse. One of the advantages of a smaller sized curl is that is involves less
likelihood of splitting occurring on the outside of the curl, so that the invention can also be employed to relieve this problem.
The weakening of the wall in the relevant area
may be achieved by mechanical treatment, such as localised indentation of the wall, crushing or squashing of the wall over the whole weakened area, or partially cutting through the wall.
Preferably the weakening is on one side of the wall, and that side lies on the inside of the curl.
Preferably indentation or cutting is carried out round a plurality of parallel lines adjacent the end of the tubular body and either on the inside surface or the outside surface of the body, depending upon whether the curl is to be inward or outward, respectively.
In a preferred embodiment of the invention the curl is an outward curl and the tubular body wall is plastics, or is fibrous with an internal lining of
liquid-proof material. A diaphragm preferably is then bonded using a known technique, and either before or after filling of the container, across the
end of the container and onto the outside of the
curl.
From a further aspect, the invention provides a
method of forming a curl round one end of a tubular body for a composite container, which
body has a body wall, the method comprising
reducing the strength of the wall in an area
extending around and adjacent one end of the
body wall without removal of material therefrom,
and forming a curl at said one end with a substantial part of the curl including said wall area whose strength has been reduced.
In order that the invention may be more clearly
understood, a preferred embodiment thereof will
now be described, by way of example only, with
reference to the accompanying diagrammatic drawings, in which:
Figure 1 shows a local cross-section through the end portion of a tubular body for a composite container, prior to formation of a curl thereon,
Figure 2 shows the same body end portion after partial formation of a curl thereon, and
Figure 3 shows the completed curl, with a diaphragm attached.
Referring to Figure 1 ,the body wall 2 comprises for its major part two adhering layers 4 and 6 of fibrous material such as paperboard. In this particular example it is assumed that an outward curl is to be formed on a tubular body for containing a liquid product, in which case the inside of the tubular wall is covered with a lining layer 8 of liquid-proof material such as polyethylene-coated Kraft paper. The outside may be covered in any desired manner and a paper label layer 10 is illustrated.
The strength of the wall is reduced, in this case by weakening the wall material adjacent the outside of the wall, i.e. primarily the material of the layer 6, by making indentations 12 in the label
10 and into the material of the layer 6. Four indentations 12 are shown and, in this case, they are parallel indentations encircling the tubular wall on its outside. The indentations 12 have the effect of weakening the material adjacent the outer surface of the tube so that the strength of the complete tube wall is reduced over an axial distance extending from, or from close, to, the edge of the tube to a point just below the lowermost indentation. The remaining and major axial extent of the tubular body is not, of course, weakened.
By applying a suitably formed press tool of generally known kind against the end of the tubular body an outward curl can be formed thereon as iilustrated in Figures 2 and 3. It can be appreciated from Figures 2 and 3 that the weakened material between and around the indentations 12 can be deformed more easily than if it were not so weakened, and consequently either the same sized curl can be formed with a lesser axial force on the press tool or a smaller curl can be formed for the same force on the press tool, which latter reduces the extent to which the layer 8 has to be stretched around the curl and consequently reduces the chance of its splitting.
Of course, both advantages may to some extent be realised by a suitable compromise between size of curl and applied force.
In Figure 3 part of a diaphragm 14 is shown, which closes the mouth of the container body and is bonded at 1 6 to the outside of the curl.
Ordinarily, splitting of the inner lining layer 8 has a tendency to occur at, and inwardly of, the bonding point 16 thus resulting both in faulty sealing and in an imperfect lining layer which can allow liquid contents of the container to seep into the fibrous layers 4 and 6. Consequently, it will be appreciated that the ability of the invention to reduce or eliminate such splitting enables the provision of composite containers with curled and diaphragm-sealed tops having improved characteristics.
The same technique may be applied to a tubular body made of plastics material. Whether the body is plastics or fibrous, the weakening of the relevant wall portion may be achieved by crushing it over the whole area to be weakened, using a flat tool rather than a sharp one as required for cutting or a blunt one as required for indentation.
Claims (14)
1. A tubular body for a composite container, having a body wall, the strength of the wall in an area extending around and adjacent one end of the body wall being reduced without removal of material therefrom, and a curl being formed at said one end, a substantial part of the curl including said wall area of reduced strength.
2. A body as claimed in claim 1 , wherein the weakening of the wsll in said area is achieved by mechanical treatment.
3. A body as claimed in claim 2, wherein the wall is indented over said area to reduce its strength.
4. A body as claimed in claim 2, wherein the wall is partially cut through over said area to reduce its strength.
5. A body as claimed in claim 3 or claim 4 wherein the indentation or cutting is carried out round a plurality of a parallel lines adjacent the end of the tubular body.
6. A body as claimed in any one of claims 2 to 5, wherein the mechanical treatment is applied to that side of the wall which is on the inside of the curl.
7. A body as claimed in any one of claims 1 to 6 in which the body wall comprises fibrous material.
8. A body as claimed in any one of the preceding claims, wherein the curl is an outward curl and the tubular body wall has an internal lining of liquid-proof material, which extends over the top of the curl.
9. A body as claimed in any one of claims 1 to 6 wherein the body wall is of plastics material.
10. A body as claimed in claim 9 wherein the curl is an outward curl.
1 A body as claimed in claim 8 or claim 10, wherein a diaphragm is bonded across the end of the body and onto the outside of the curl.
12.A method of forming a curl round one end of a tubular body four a composite container, which body has a body wall, the method comrising reducing the strength of the wall in an area extending around the adjacent one end of the body wall without removal of material therefrom, and forming a curl at said one end with a substantial part of the curl including said wall area whose stength has been reduced.
13. A tubular body for a composite container substantially as hereinbefore described with reference to the accompanying drawings.
14. A method of forming a tubular body for a composite container substantially as hereinbefore described with reference to the accompanying drawings.
GB7838426A
1978-09-27
1978-09-27
Composite containers
Expired
GB2030953B
(en)
Priority Applications (3)
Application Number
Priority Date
Filing Date
Title
GB7838426A
GB2030953B
(en)
1978-09-27
1978-09-27
Composite containers
ZA00794776A
ZA794776B
(en)
1978-09-27
1979-09-10
Composite containers
FR7924031A
FR2437294A1
(en)
1978-09-27
1979-09-27
COMPOSITE CONTAINERS FORMED OF A TUBULAR BODY HAVING A ROLLED EDGE END
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB7838426A
GB2030953B
(en)
1978-09-27
1978-09-27
Composite containers
Publications (2)
Publication Number
Publication Date
GB2030953A
true
GB2030953A
(en)
1980-04-16
GB2030953B
GB2030953B
(en)
1983-05-05
Family
ID=10499958
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB7838426A
Expired
GB2030953B
(en)
1978-09-27
1978-09-27
Composite containers
Country Status (3)
Country
Link
FR
(1)
FR2437294A1
(en)
GB
(1)
GB2030953B
(en)
ZA
(1)
ZA794776B
(en)
Cited By (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3325417A1
(en)
*
1983-07-14
1985-01-24
Ostma Maschinenbau Gmbh
Process for the manufacture of a cylindrical hollow body from cardboard
FR2695815A1
(en)
*
1992-09-23
1994-03-25
Richardier Martin
Support for plate displaying article for sale – is formed by rectangular plate body, with parallel cuts partially through it, allowing it to curve, and with plate fixed to top
EP1083040A1
(en)
*
1999-09-08
2001-03-14
Illig, Adolf Maschinenbau GmbH & Co.
Mould for the fabrication of containers made of a heated thermoplastic film and the container
WO2008014230A1
(en)
*
2006-07-27
2008-01-31
Paper Machinery Corporation
Two piece paper cup and sidewall blank therefor
1978
1978-09-27
GB
GB7838426A
patent/GB2030953B/en
not_active
Expired
1979
1979-09-10
ZA
ZA00794776A
patent/ZA794776B/en
unknown
1979-09-27
FR
FR7924031A
patent/FR2437294A1/en
active
Granted
Cited By (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3325417A1
(en)
*
1983-07-14
1985-01-24
Ostma Maschinenbau Gmbh
Process for the manufacture of a cylindrical hollow body from cardboard
FR2695815A1
(en)
*
1992-09-23
1994-03-25
Richardier Martin
Support for plate displaying article for sale – is formed by rectangular plate body, with parallel cuts partially through it, allowing it to curve, and with plate fixed to top
EP1083040A1
(en)
*
1999-09-08
2001-03-14
Illig, Adolf Maschinenbau GmbH & Co.
Mould for the fabrication of containers made of a heated thermoplastic film and the container
WO2008014230A1
(en)
*
2006-07-27
2008-01-31
Paper Machinery Corporation
Two piece paper cup and sidewall blank therefor
Also Published As
Publication number
Publication date
FR2437294A1
(en)
1980-04-25
ZA794776B
(en)
1980-08-27
GB2030953B
(en)
1983-05-05
FR2437294B3
(en)
1981-07-31
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Legal Events
Date
Code
Title
Description
1991-05-22
PCNP
Patent ceased through non-payment of renewal fee
