GB2198113A - Manufacture of bags - Google Patents

Manufacture of bags Download PDF

Info

Publication number
GB2198113A
GB2198113A GB08628480A GB8628480A GB2198113A GB 2198113 A GB2198113 A GB 2198113A GB 08628480 A GB08628480 A GB 08628480A GB 8628480 A GB8628480 A GB 8628480A GB 2198113 A GB2198113 A GB 2198113A
Authority
GB
United Kingdom
Prior art keywords
bag
tube
collar
walls
containing liquids
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.)
Granted
Application number
GB08628480A
Other versions
GB8628480D0 (en
GB2198113B (en
Inventor
Peter Leslie Steer
Graham Emery Steer
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.)
Craig Medical Products Ltd
Original Assignee
Craig Medical Products Ltd
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.)
Filing date
Publication date
Application filed by Craig Medical Products Ltd filed Critical Craig Medical Products Ltd
Priority to GB8628480A priority Critical patent/GB2198113B/en
Publication of GB8628480D0 publication Critical patent/GB8628480D0/en
Priority to GB8716089A priority patent/GB2197849B/en
Priority to DE8787310365T priority patent/DE3767452D1/en
Priority to EP87310365A priority patent/EP0269419B1/en
Priority to AT87310365T priority patent/ATE59996T1/en
Priority to ES87310365T priority patent/ES2020281B3/en
Priority to JP62301383A priority patent/JP2577018B2/en
Priority to CA000553099A priority patent/CA1315140C/en
Publication of GB2198113A publication Critical patent/GB2198113A/en
Priority to US07/215,835 priority patent/US4876788A/en
Priority to US07/374,415 priority patent/US5002623A/en
Application granted granted Critical
Publication of GB2198113B publication Critical patent/GB2198113B/en
Priority to US07/638,227 priority patent/US5226564A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
    • A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
    • A61J1/05—Containers specially adapted for medical or pharmaceutical purposes for collecting, storing or administering blood, plasma or medical fluids ; Infusion or perfusion containers
    • A61J1/10—Bag-type containers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
    • A61F5/44—Devices worn by the patient for reception of urine, faeces, catamenial or other discharge; Portable urination aids; Colostomy devices
    • A61F5/4404—Details or parts
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/64—Joining a non-plastics element to a plastics element, e.g. by force
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
    • B29C65/68—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined using auxiliary shrinkable elements
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/124—Tongue and groove joints
    • B29C66/1246—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove
    • B29C66/12469—Tongue and groove joints characterised by the female part, i.e. the part comprising the groove being asymmetric
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/133—Fin-type joints, the parts to be joined being flexible
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • B29C66/5326—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially flat
    • B29C66/53261—Enclosing tubular articles between substantially flat elements
    • B29C66/53262—Enclosing spouts between the walls of bags, e.g. of medical bags
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • B29C70/74—Moulding material on a relatively small portion of the preformed part, e.g. outsert moulding
    • 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
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7234—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer
    • B29C66/72343—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a barrier layer for liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0065—Permeability to gases
    • B29K2995/0067—Permeability to gases non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0068—Permeability to liquids; Adsorption
    • B29K2995/0069—Permeability to liquids; Adsorption non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7148—Blood bags, medical bags

Abstract

A tube 10 is held in position between two superposed walls of a bag 12 by a light seam welding operation, no special precautions in this step being taken to make the joint leakproof. Thereafter, the bag and tube combination is placed between the blocks of a mould, each having confronting recesses, and molten plastics material is injected to fill these recesses, the injection being done, as normal, under heat and pressure. This injected material forms a collar 22 which completely surrounds the tube, the bag film material on either side of the tube having been melted to itself and to the tube wall and the collar being securely attached in an encircling configuration so precluding leakage. <IMAGE>

Description

2198113 -I- MANUFACTURE OF BAGS This invention relates to the manufacture
of bags for containing liquids, and to the bags themselves.
Bags such as urostomy bags, urine bags, colostomy bags, etc. commonly have two superposed sheets of plastics material welded around their periphery. The weld may be either radio-frequency welding or heat welding. It is often desired to have an outlet tube from a lower region of the bag. Such tubes are often also plastics material. Problems arise when making weld joints to.fix the tube to the two bag walls in a leak-proof manner. In particular, there frequently exist two leak paths at the locations indicated in Figure 2 of the accompanying drawings. This problem is particularly acute with bags for containing urine because urine has a low surface tension and will readily find any leak path. Welding a plastics tube between bag walls is a particularly difficult problem when one is employing multi-film laminate material for each bag wall, some of the layers of the laminate being intended to provide strength and liquid impermeability and one or more other layers of the laminate being particularly directed to providing gas impermeability. In the context of a rate of manufacture of bags of up to 2000 per hour, and using a thin multi-laminate film as the bag wall, joining such walls to a tube of appreciable wall thickness presents difficulties in delivering a suitable amount of heat both to the thin bag wall film and to the relatively thick tube wall.
According to the present invention, a tube is held in position between two superposed walls of a bag by a light seam welding operation, no special precautions in this step being taken to make the joint leakproof. Thereafter, the bag and tube combination is placed between the blocks of a mould, each having confronting recesses of a particular shape, and molten plastics material is injected to fill these recesses, the injection being done, as normal, under heat and pressure. This injected material forms a collar which completely surrounds the tube, the bag film material on either side of the tube having been melted to itself and to the tube wall and the collar being securely attached in an encircling configuration so precluding leakage.
The invention accordingly provides a bag for containing liquids in which a joint between an outlet tube and superposed portions of the bag walls is encircled by a collar moulded thereon under heat and pressure. In this way, it is possible in most cases to preclude any leak paths.
In another aspect of the invention, a method for manufacturing a bag for containing liquids comprises the steps of seam welding an outlet tube in position between superposed bag walls and, as a second step, injection moulding a collar of synthetic plastics material, chosen to be compatible with the bag walls and tube, around the tube, the collar being moulded under heat and pressure so as to close off any leak paths.
The invention will be better understood from the following description of a non-limiting embodiment thereof, given with reference to the accompanying drawings in which:-
Figure 1 is a perspective view of a bag having an outlet tube attached thereto in a conventional manner; Figure 2 is a cross-section on the line IMI of Figure I illustrating the two leak paths LP which frequently occur with this method despite all efforts to avoid them; Figure 3 illustrates the first step of one example of method according to the present invention, in perspective view; Figure 4 illustrates the second step of the method; Figure 5 is a perspective view of one of the two mould blocks making up the mould for the injection moulding step; and Figure 6 is a perspective view similar to Figures 1 and 3 illustrating the completed bag having a collar surrounding the tube and integrated with it and the associated portions of the bag walls.
Referring to Figures 3-6, in the method according to the invention, a plastis tube 10 is lightly seam welded by the illustrated seam weld 15 between the two superposed bag films 12 and 14. The tube may itself be an injection moulded tube and may be ribbed. As a second step, the intermediate product so produced is placed between two mould blocks 16 and 18, Figure 4, whose shape can be seen from Figure 5. The upper block 16 has an injection port 20 for entry of synthetic plastics material and the remaining portions of the injection 1 moulding apparatus are not shown since they are conventional and will be familiar to a man of average skill in this art. The mould blocks 16 and 18 are shaped to define an encircling collar which extends axially of the tube length substantially equal to the length I indicated in Figure 3. In the second stage of the manufacturing method, molten synthetic plastics material which is compatible with the tube material and the bag film material is injected through the hole 20 under heat and pressure. Polyethylene, particularly high density polyethylene, is suitable. Temperatures and pressures conventionally employing in injection moulding the chosen plastics material are suitable in this instance. The injected material is then allowed to cool and the blocks are opened. During the cooling, the collar shrinks, which reduces the likelihood of leak paths being formed. The resulting product is illustrated in Figure 6. As will be seen, an outer collar 22 is moulded around and integrated with the material of the tube 10 and the portions 12a, 14a, (Figure 3) of the bag film material. Due to the application of heat and pressure during the injection moulding step, the likelihood of the resulting product having leak paths such as leak paths LP of Figure 2 is greatly reduced.

Claims (5)

1. A method of making a bag for containing liquids in which a tube is held in position between two superposed walls of a bag by a light seam welding operation, the resulting bag and tube combination is placed between the blocks of a mould, each having confronting recesses of a particular shape, and molten plastics material is injected to fill these recesses, the injection being done under heat and pressure.
2. A bag for containing liquids in which a joint between an outlet tube and superposed portions of the bag walls is encircled by a collar moulded thereon under heat and pressure.
3. A method for manufacturing a bag for containing liquids comprises the steps of seam welding an outlet tube in position between superposed bag walls and, as a second step, injection moulding a collar of synthetic plastics material, chosen to be compatible with the bag walls and tube, around the tube, the collar being moulded under heat and pressure so as to close off any leak paths.
4. A method of making a bag for containing liquids substantially as herein described with reference to and as illustrated in the accompanying drawings.
5. illustrated herein.
Any novel combination or sub-combination disclosed and/or 1 Publis lied 1988 at The Patent Office, State House, 6671 High Holborn, London WC1R 4TP Further copies InaY be obtained from The Patent Office, Sales Branch, St Maxy Cray, Orpington, Kent BR5 3RD Printed by Multiplex techniques ltd. St Mary Cray, Kent. Con. 1/87.
GB8628480A 1986-11-28 1986-11-28 Manufacture of bags Expired - Fee Related GB2198113B (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
GB8628480A GB2198113B (en) 1986-11-28 1986-11-28 Manufacture of bags
GB8716089A GB2197849B (en) 1986-11-28 1987-07-08 Manufacture of bags
DE8787310365T DE3767452D1 (en) 1986-11-28 1987-11-24 PRODUCTION OF BAGS.
EP87310365A EP0269419B1 (en) 1986-11-28 1987-11-24 Manufacture of bags
AT87310365T ATE59996T1 (en) 1986-11-28 1987-11-24 MANUFACTURE OF BAGS.
ES87310365T ES2020281B3 (en) 1986-11-28 1987-11-24 MANUFACTURE OF BAGS.
JP62301383A JP2577018B2 (en) 1986-11-28 1987-11-28 Bag manufacturing method
CA000553099A CA1315140C (en) 1986-11-28 1987-11-30 Manufacture of bags
US07/215,835 US4876788A (en) 1986-11-28 1988-07-06 Method of making a leakproof connection about the outlet tube of a liquid containment bag
US07/374,415 US5002623A (en) 1986-11-28 1989-06-30 Manufacture of bags
US07/638,227 US5226564A (en) 1986-11-28 1991-01-04 Manufacture of bags

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8628480A GB2198113B (en) 1986-11-28 1986-11-28 Manufacture of bags

Publications (3)

Publication Number Publication Date
GB8628480D0 GB8628480D0 (en) 1987-01-07
GB2198113A true GB2198113A (en) 1988-06-08
GB2198113B GB2198113B (en) 1990-10-31

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
GB8628480A Expired - Fee Related GB2198113B (en) 1986-11-28 1986-11-28 Manufacture of bags
GB8716089A Expired - Fee Related GB2197849B (en) 1986-11-28 1987-07-08 Manufacture of bags

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB8716089A Expired - Fee Related GB2197849B (en) 1986-11-28 1987-07-08 Manufacture of bags

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GB (2) GB2198113B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4854737A (en) * 1987-01-12 1989-08-08 E. R. Squibb And Sons, Inc. Bags for containing liquids
GB2197849B (en) * 1986-11-28 1991-07-24 Craig Med Prod Ltd Manufacture of bags

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK1047360T3 (en) * 1998-01-15 2005-02-14 Bioderm Inc Two-piece external incontinence device
US10022261B1 (en) 2017-05-31 2018-07-17 Bioderm, Inc. Incontinence device with atmospheric equilibrium valve assembly

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198113B (en) * 1986-11-28 1990-10-31 Craig Med Prod Ltd Manufacture of bags
GB2199500A (en) * 1987-01-12 1988-07-13 Craig Med Prod Ltd Bags for containing liquids

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2197849B (en) * 1986-11-28 1991-07-24 Craig Med Prod Ltd Manufacture of bags
US4854737A (en) * 1987-01-12 1989-08-08 E. R. Squibb And Sons, Inc. Bags for containing liquids

Also Published As

Publication number Publication date
GB8628480D0 (en) 1987-01-07
GB8716089D0 (en) 1987-08-12
GB2198113B (en) 1990-10-31
GB2197849B (en) 1991-07-24
GB2197849A (en) 1988-06-02

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