GB2197849A - Manufacture of bags - Google Patents
Manufacture of bags Download PDFInfo
- Publication number
- GB2197849A GB2197849A GB08716089A GB8716089A GB2197849A GB 2197849 A GB2197849 A GB 2197849A GB 08716089 A GB08716089 A GB 08716089A GB 8716089 A GB8716089 A GB 8716089A GB 2197849 A GB2197849 A GB 2197849A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- bag
- collar
- outlet
- walls
- 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
Links
Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Pharmacology & Pharmacy (AREA)
- Hematology (AREA)
- Nursing (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Tubes (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
Abstract
A tube 10 is held in position between two superposed synthetic plastics walls of a bag by a light seam welding operation, with no special precautions taken in this step to make the joint leakproof. The bag and tube combination is then placed between the blocks of a mould, having confronting recesses and molten plastics material is injected to fill these recesses. The injected material forms a collar 22 which completely surrounds the tube. The bag film material on either side of the tube is melted to itself and to the tube wall, and the collar is securely attached in an encircling 22 configuration so precluding leakage. <IMAGE>
Description
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 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. One proposal for heat welding a tube to a bag is shown in U.S. Patent 4 023 607 of O.R. Jensen et al. 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
LP 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 of mouldable synthetic plastics material moulded thereon under heat and pressure. In this way, it is possible in most cases to produce a bag outlet which does not have 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 tube may be a part of any kind of tap or other outlet fitting.
According to a particular embodiment of the invention, a push-pull type tap is welded between the walls of a drainage or an ostomy bag.
The invention will be better understood from the following description of non-limiting embodiments 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 Il-Il of Figure 1 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;;
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;
Figure 7 is an end view of a form of bag outlet which incorporates an integral stopper;
Figure 8 is a front view of the outlet shown in Figure 7;
Figure 9 is a cross-section on the line IX - IX of Figure 8.
Figure 10 is a front view of a drainage bag including a welded-in push-pull type outlet tap;
Figure 11 is a view similar to Figure 10 but showing the outlet tap in its open (pulled down) condition; and
Figure 12 is a perspective view illustrating an embodiment of the invention.
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 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 1 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. For use with some film materials containing or made of e.v.a., it may be desirable to use for the injected plastics material a plastics material which includes up to 10% of e.v.a. to obtain compatibility with the bag film. The skilled man in the art will naturally choose suitable materials in the light of the bag film being used. 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.
Referring now to Figures 7-9, the illustrated bag outlet tube 10 includes an integral stopper 12. The tube 10 is made in one piece with a bag wall attachment block 14, a web16 and an outlet portion 18. The latter is flexible so that the tube 18 can be folded up and its open end engaged with the stopper 12 whereby an obturating member 20 of the stopper 12 closes the outlet end of the tube portion 18.
The attachment block 14 has a shape as seen in plan which tapers sharply to one end 22 of the block and tapers less sharply to the other end of the block. At this end of the block 14 there is a relatively stiff, integral connection 24 to the stopper 12. This permits a slight amount of flexing of the stopper relative to the block 14. The tube 10 has peripheral ribs 26 on its outer surface in the region above the block 14; these assist in securing good adhesion without leakage when the bag walls are united with the outlet in the manner described above. A web 28 is provided integral with the block 14 and the tube outlet portion 18 to prevent undesired flexing of the portion of the tube 18 near to the block 14. A tapered fitting 30 is integral with the outlet portion 18.
Figures 10 and 11 illustrate a different embodiment of the invention. A bag 40 for receiving urine has front and rear walls welded together around the periphery by welds 42 and 44. At the outlet region between the walls is located a block 45 which is tapered suitably to merge with the walls, as is known in the art (see for example British Patent No. 1 308 519 now expired). The block 45 is made integral with a first tube 46 and a second tube 48 which forms the inner member of a push-pull tap 50. The movable member of the tap 50 is generally identified 52 and is axially slidable relative to the tube 48. The lower limit of this axial sliding movement is determined, as best seen in Figure 11, by engagement of an internal flange 54 on the tube 52 with a peripheral rib 56 on the tube 48.This defines the open condition of the tap 50.
The upper limiting (closed) condition of the tap 50 occurs when an obturating member 58 mounted internally within the tube 52 by radial arms 60 (in spider fashion) is in engagement with the lower end of the tube 48. In this position the obturating member 58 closes the opening at the lower end of the tube 48 and stops the urine escaping from within the bag. Suitable guide means (not shown) are provided to ensure that the tube 52 slides truly axially relative to the tube 48 but the sizing and engagement of the parts is chosen so that the friction is sufficient to keep the tap normally closed.
This kind of tap is readily integrated with a bag in the same operation by which the walls of the bag are welded together. This leads to a considerable reduction in the cost of manufacture and yet yields a virtually leakproof bag having an integral tap. While a push-pull tap has been illustrated, in Figures 10 and 11 other kinds of tap can be employed with equal or greater advantage. The integration achieved by the disclosed method between the parts 42, 44, 45 and 46 is such that the difficult problem of leakage in this area is almost 100% overcome.
Figure 12 illustrates a step in a preferred assembly method in accordance with the invention. An ostomy bag rear wall formed by a film 60 is laid in a suitable injection moulding machine on top of a shaped block 62. An outlet means 64 (which may be in accordance with Figures 7-9 or Figure 10 and 11 but is illustrated as a simple spigot having an integral plug) is placed in an appropriate location on the film 60. A front wall formed by a film 66 is then laid over. Finally a block 68, similar to block 62 is placed on the film 66 above the outlet means 64. The blocks 62 and 68 are of synthetic plastics material compatible with that of the film and the outlet means 64. A seam welding step is then carried out to bond together the peripheries of the films 60, 66 at the seams indicated 61, 67, and to trap the outlet means 64 there between.
Reliance is not placed on this operation to achieve a leakproof joint between the outlet means 64 and the films 60, 66. Thereafter, an injection moulding operation is carried out, under the application of heat and pressure, to bond securely together the parts 60-68. The resulting ostomy bag is found to be free of leaks, due to the thorough unification of the parts 60, 62, 64, 66 and 68 by the disclosed method.
Claims (8)
1. A method of manufacturing a bag in which 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, the bag and tube combination is placed between two blocks of a mould, each block having a recess confronting a complementary recess in the other, and injecting a molten plastics material to fill these recesses, to form 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.
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 of mouldable synthetic plastics material moulded thereon under heat and pressure.
3 A method for manufacturing a bag for containing liquids comprising a step 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 according to claim 1 or 3 in which the tube is part of a tap or other outlet fitting.
5. A bag according to Claim 2 in which the tube is part of an outlet tap.
6. A method of manufacturing a bag substantially as herein described with reference to and as illustrated in the accompanying drawings.
7. A bag for containing liquids substantially as herein described with reference to and as illustrated in the accompanying drawings.
8. Any novel combination or sub-combination disclosed and/or illustrated herein.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
---|---|
GB8716089D0 GB8716089D0 (en) | 1987-08-12 |
GB2197849A true GB2197849A (en) | 1988-06-02 |
GB2197849B GB2197849B (en) | 1991-07-24 |
Family
ID=10608110
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 Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8628480A Expired - Fee Related GB2198113B (en) | 1986-11-28 | 1986-11-28 | Manufacture of bags |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB2198113B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999036009A1 (en) * | 1998-01-15 | 1999-07-22 | Bioderm, Inc. | Two-piece external incontinence device |
US10022261B1 (en) | 2017-05-31 | 2018-07-17 | Bioderm, Inc. | Incontinence device with atmospheric equilibrium valve assembly |
Families Citing this family (2)
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 |
Family Cites Families (2)
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 |
-
1986
- 1986-11-28 GB GB8628480A patent/GB2198113B/en not_active Expired - Fee Related
-
1987
- 1987-07-08 GB GB8716089A patent/GB2197849B/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999036009A1 (en) * | 1998-01-15 | 1999-07-22 | Bioderm, Inc. | Two-piece external incontinence device |
US10022261B1 (en) | 2017-05-31 | 2018-07-17 | Bioderm, Inc. | Incontinence device with atmospheric equilibrium valve assembly |
Also Published As
Publication number | Publication date |
---|---|
GB8628480D0 (en) | 1987-01-07 |
GB8716089D0 (en) | 1987-08-12 |
GB2197849B (en) | 1991-07-24 |
GB2198113A (en) | 1988-06-08 |
GB2198113B (en) | 1990-10-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20010708 |