CH376651A - Method for producing a hollow body and hollow body produced by this method - Google Patents
Method for producing a hollow body and hollow body produced by this methodInfo
- Publication number
- CH376651A CH376651A CH8233559A CH8233559A CH376651A CH 376651 A CH376651 A CH 376651A CH 8233559 A CH8233559 A CH 8233559A CH 8233559 A CH8233559 A CH 8233559A CH 376651 A CH376651 A CH 376651A
- Authority
- CH
- Switzerland
- Prior art keywords
- hollow body
- intermediate electrode
- welding
- electrode
- welded
- Prior art date
Links
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
- 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
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
- A47C27/08—Fluid mattresses or cushions
- A47C27/081—Fluid mattresses or cushions of pneumatic type
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
- A47C27/08—Fluid mattresses or cushions
- A47C27/10—Fluid mattresses or cushions with two or more independently-fillable chambers
-
- 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
- B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
- B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and 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
- B29C66/01—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
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
-
- 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
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
-
- 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
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
-
- 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
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/49—Internally supporting the, e.g. tubular, article during joining
-
- 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
- B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
-
- 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
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/832—Reciprocating joining or pressing tools
-
- 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
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/06—PVC, i.e. polyvinylchloride
-
- 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
- B29L2022/00—Hollow articles
- B29L2022/02—Inflatable articles
-
- 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
- B29L2031/751—Mattresses, cushions
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Resistance Welding (AREA)
Description
Verfahren zur Herstellung eines Hohlkörpers und nach diesem Verfahren hergestellter Hohlkörper
Hohlkörper, wie Bälle, Kissen, Matratzen, Schwimmtiere, Flüssigkeitsbehälter, Schläuche usw., werden üblicherweise aus thermoplastischer Folie, insbesondere aus Folie aus weichgemachtem Polyvinylchlorid (PVC) oder PVC-Mischpolymerisaten oder aus mit thermoplastischem Material beschichte- tem Gewebe durch Verschweissen der Nahtstellen im Hochfrequenzfeld hergestellt.
Bei Druckbeanspruchung eines solchen Hohlkörpers, z. B. durch Aufblasen mit Luft oder durch Füllen mit Flüssigkeit wird die Schweissnaht auf Kerbwirkung beansprucht und reisst leicht auf. Aus der Praxis ist es bekannt, dass z. B. Matratzen aus Weich-PVC-Folie sehr häufig zu Reklamationen Anlass geben, weil die Schweissnähte aufplatzen.
Dabei wären solche Matratzen wegen der Unempfindlichkeit gegenüber Licht und Wasser besonders als Schwimmatratzen sehr gesucht und den bisher verwendeten Matratzen aus gummierten Stoffen wegen deren Anfälligkeit gegen Sonne, Wasser und Alterung weit überlegen. Bis jetzt konnten sich aber z. B. Schwimmatratzen aus Thermoplastmaterial wegen den unzuverlässigen Schweissnähten nicht durchsetzen. Die Erfindung betrifft ein Verfahren zur Herstellung eines Hohlkörpers durch Verschwei- ssen einer Folie aus thermoplastischem Kunststoff oder von mit solchem Kunststoff beschichtetem Gewebe, welches Verfahren dadurch gekennzeichnet ist, dass die Schweissnaht unter Zuhilfenahme einer Zwischenelektrode durch Überlappung hergestellt wird.
In der Zeichnung sind Ausführungsbeispiele dargestellt.
Fig. 1 zeigt eine Elektrodenanordnung, wie sie bei der Durchführung des Verfahrens verwendet werden kann. Aus der PVC-Folie A wird durch Umbiegen und Uberlappen der Seitenränder ein Schlauch gebildet. Dieser Schlauch wird zwischen die Elektro- den E und F gelegt. In den Schlauch wird unter die zu bildende SchweS3naht die Zwischenelektrode Z eingeführt. Unter Wirkung des Hochfrequenzfeldes wird zwischen der Elektrode E und der Zwischenelektrode Z eine Schweissnaht gebildet.
Die Zwischenelektrode hat zweckmässig eine GTunldfläche bz¯ 1, 1 bE, wobei bE die Grundfläche der einen Aussenelektrode E bedeutet. Dadurch ist die der Schweissnaht gegenüberliegende Folie am Schweissprozess nicht mitbeteiligt, und die Schweissstelle wird nicht durchmarkiert.
Fig. 2 zeigt einen Querschnitt durch einen erfin- dungsgemäss hergestellten Schlauch. Wird dieser aufgeblasen, ist die Naht in Richtung der Pfeile auf Scherwirkung beansprucht. Eine solche Naht kann bei den praktisch auftretenden Beanspruchungen nicht aufreissen.
Versuche an einer 0,4 mm starken, weichgemach- ten Polyvinylchloridfolie von der Zusammensetzung : 100 Teile PVC, 50 Teile Dioctylphthalat, 2 Teile Stabilisator haben folgende Festigkeiten der Schweiss- naht engeben.
Nach üblichen Verfahren Erfindungsgemäss geschweisst geschweisst
Zerreisskraft Zerreisskraft I cm breiter Streifen 1 cm breiter Streifen Versuch 1 5,2 kg Versuch 5 8,0 kg* Versuch 2 5,0 kg Versuch 6 8,4 kg* Versuch 3 4,8 kg Versuch 7 9,0 kg* Versuch 4 5,1 kg Versuch 8 9,4 kg* Versuch 5 4,8 kg Versuch 9 8,0 kg Mittel 5,0 kg Mittel 8,4 kg * Folie zerrissen, Schweissnaht intakt.
Eine nach dem neuen Verfahren hergestellte Schweissnaht weist deshalb eine etwa 70 /o höhere Festigkeit auf als eine gewöhnliche Schweissnaht, wobei in den meisten Fällen beim Zerreissversuch die Schweissnaht intakt bleibt und die Folie selbst reisst. Bei der herkömmlichen Schweissmethode ist in jedem Fall die Schweissnaht die schwächste Stelle.
Der Fortschritt dieser Schweissnaht ist eklatant und ermöglicht erstmals die Herstellung von stark beanspruchten Hohlkörpern, wie Schläuche, Matratzen, Behälter, ohne dass ein Aufreissen der Schweiss- naht befürchtet werden muss.
Die Zwischcnelektrodekami wie in Fig. 3 und 4 veranschaulicht ausgebildet sein, wobei die Grundfläche wiederum zweckmässig bz > 1, l bE beträgt.
Die Zwischenelektrode kann auch aus einer Metallfolie bestehen (Fig. 5), wobei ihre Höhe hz zweck- mässig mindestens 0, 01 mm betragen soll. Als Metall kann z. B. Kupfer, Messin, Aluminium verwendet werden.
Weiterhin kann die Zwischenelektrode auch aus einem starren oder flexiblen Isoliermaterial 1 (z. B.
Phenolharz, phenolharzgetränkte Papiere, Karton, Thermoplastfolie mit hohem Erweichungspunkt) bestehen, welches ein-oder zweiseitig mit einem Metalllack L beschichtet ist.
Alle offenen Hohlkörper können nach diesem Verfahren mit stabilen Zwischenolektroden geschweisst werden. Geschlossene e Hohlkörper können entweder so geschweisst werden, dass als Zwischenelektrode ein Metallfolienband (Fig. 5) oder ein flexibles metallackbeschichtetes Isoliermaterialband (gemäss Fig. 6) verwendet wird, welches nach der Schweissung im Hohlkörper verbleibt. Oder es wird mit stabiler Zwischenelektrode so weit geschweisst, bis noch eine so grosse Öffnung verbleibt, dass die Zwi schenelektrode gerade noch herausgenommen werden kann. Die verbleibende Offnung wird hierauf mit Hilfe einer Metallfolie oder eines metallackbeschich- teten Isoliermaterials zugeschweisst.
Beispiel
Eine Matratze mit Zwischenstegen (gemäss Fig. 7) kann wie folgt hergestellt werden :
Um eine Scherbeanspruchung in den Schweissnähten zu erzielen, müssen die Zwischenstege 1 und 2 auf jeder Seite auf die Grund-und Deckfolie aufgeschweisst werden. Dabei können die Zwischenstege aus zwei separaten Folien bestehen (Fig. 8) oder aus einem einzigen Doppel-T-Profil (Fig. 9).
Der Mittelsteg 1 wird nach bekannter Methode in ein, zwei oder vier Arbeitsgängen eingeschweisst.
Der Steg 2 kann nun so geschweisst werden, dal3 für die innere Seite eine bei a und b teilbare Zwischenelektrode verwendet wird (Fig. 10), so dass der ganze Steg 2 bis auf zwei Offnungen bei a und b von je 8 cm Länge in einem Schweissvorgang zwischen zwei Elektroden verschweisst wird. Die Zwi schenelektrode wird hierauf getrennt und die zwei Hälften nacheinander durch die Öffnungen a und b gestossen und durch Drehen aus den Kammern entfernt. Hierauf werden die Öffnungen a und b durch Einlage einer 0, 08 mm dicken, 3 cm breiten und 12 cm langen Aluminiumfolie mittels einer 10 cm langen Stabelektrode zugeschweisst.
Gleichzeitig mit der innern Seite wird mit einer gleichgeformten Elektrode (Fig. 10) auch die äussere Naht des Steges 2 verschweisst, ebenfalls mit Auslassung von Öffnungen bei a und b, welche nach Entfernung der innern Zwischenelektrode zugeschweisst werden.
Die Ventile V, V können nun auf iibliche Weise oder aber erst nach Fertigstellung der Matratze mittels einer Metallfolienzwischenelektrode einge schweisst werden.
Die Schweissnaht 3 wird nun entweder unter Zuhilfenahme eines Aluminiumfolienstreifens in einem Arbeitsgang verschweisst oder aber mit einer teilbaren, stabilen Zwischenelektrode, welche wie bei Fig. 10 zwei Öffnungen frei lässt, welch letztere nach Entfernen der stabilen Zwischenelektrode mittels eines Aluminiumfolienstreifens zugeschweisst werden.
Method for producing a hollow body and hollow body produced by this method
Hollow bodies, such as balls, pillows, mattresses, swimming animals, liquid containers, hoses, etc., are usually made of thermoplastic film, in particular film made of plasticized polyvinyl chloride (PVC) or PVC copolymers or from fabric coated with thermoplastic material by welding the seams in the High frequency field established.
When such a hollow body is subjected to pressure, e.g. B. by inflating with air or by filling with liquid, the weld seam is stressed to notch effect and tears easily. From practice it is known that, for. B. mattresses made of soft PVC film very often give rise to complaints because the weld seams burst.
Because of their insensitivity to light and water, such mattresses would be in great demand, especially as swimming mattresses, and would be far superior to the mattresses made of rubberized materials previously used because of their susceptibility to sun, water and aging. Until now, however, z. B. not enforce floating mattresses made of thermoplastic material because of the unreliable weld seams. The invention relates to a method for producing a hollow body by welding a film made of thermoplastic or fabric coated with such a plastic, which method is characterized in that the welding seam is produced by overlapping with the aid of an intermediate electrode.
Exemplary embodiments are shown in the drawing.
1 shows an electrode arrangement as can be used when carrying out the method. A tube is formed from the PVC film A by bending and overlapping the side edges. This hose is placed between electrodes E and F. The intermediate electrode Z is inserted into the hose under the weld seam to be formed. Under the effect of the high frequency field, a weld seam is formed between the electrode E and the intermediate electrode Z.
The intermediate electrode expediently has a GTunldfläche bz¯ 1, 1 bE, where bE means the base area of one outer electrode E. As a result, the film opposite the weld seam is not involved in the welding process, and the welding point is not marked through.
2 shows a cross section through a hose produced according to the invention. If this is inflated, the seam is subjected to shear in the direction of the arrows. Such a seam cannot tear open under the practical stresses that occur.
Tests on a 0.4 mm thick, plasticized polyvinyl chloride film with the composition: 100 parts of PVC, 50 parts of dioctyl phthalate, 2 parts of stabilizer gave the weld seam strengths as follows.
Welded according to the invention using conventional methods
Tear force Tear force I cm wide strip 1 cm wide strip Experiment 1 5.2 kg Experiment 5 8.0 kg * Experiment 2 5.0 kg Experiment 6 8.4 kg * Experiment 3 4.8 kg Experiment 7 9.0 kg * Experiment 4 5.1 kg trial 8 9.4 kg * trial 5 4.8 kg trial 9 8.0 kg average 5.0 kg average 8.4 kg * foil torn, weld seam intact.
A weld seam produced according to the new process therefore has a strength that is around 70% higher than a normal weld seam, whereby in most cases the weld seam remains intact and the film itself tears during the tear attempt. With the conventional welding method, the weld seam is always the weakest point.
The progress of this weld seam is striking and for the first time enables the manufacture of heavily stressed hollow bodies, such as hoses, mattresses and containers, without fear of the weld seam tearing open.
The intermediate electrode chambers can be designed as illustrated in FIGS. 3 and 4, the base area in turn being expediently bz> 1, l bE.
The intermediate electrode can also consist of a metal foil (FIG. 5), whereby its height hz should expediently be at least 0.01 mm. The metal can be, for. B. copper, brass, aluminum can be used.
Furthermore, the intermediate electrode can also be made of a rigid or flexible insulating material 1 (e.g.
Phenolic resin, paper impregnated with phenolic resin, cardboard, thermoplastic film with a high softening point), which is coated on one or both sides with a metal lacquer L.
All open hollow bodies can be welded with stable intermediate electrodes using this process. Closed hollow bodies can either be welded in such a way that a metal foil tape (FIG. 5) or a flexible metal lacquer-coated insulating material tape (according to FIG. 6) is used as the intermediate electrode, which remains in the hollow body after welding. Or it is welded with a stable intermediate electrode until there is still an opening large enough for the intermediate electrode to just be removed. The remaining opening is then welded shut with the aid of a metal foil or an insulating material coated with a metal lacquer.
example
A mattress with dividers (according to Fig. 7) can be produced as follows:
In order to achieve a shear stress in the weld seams, the intermediate webs 1 and 2 must be welded onto the base and cover foil on each side. The intermediate webs can consist of two separate foils (Fig. 8) or a single double-T profile (Fig. 9).
The central web 1 is welded in using a known method in one, two or four operations.
The web 2 can now be welded in such a way that an intermediate electrode that can be divided at a and b is used for the inner side (Fig. 10), so that the entire web 2 except for two openings at a and b, each 8 cm long in one Welding process is welded between two electrodes. The intermediate electrode is then separated and the two halves pushed one after the other through the openings a and b and removed from the chambers by turning. The openings a and b are then welded shut by inserting a 0.08 mm thick, 3 cm wide and 12 cm long aluminum foil using a 10 cm long stick electrode.
Simultaneously with the inner side, the outer seam of the web 2 is also welded with an identically shaped electrode (FIG. 10), likewise with the omission of openings at a and b, which are welded shut after the inner intermediate electrode has been removed.
The valves V, V can now be welded in the usual way or only after the mattress has been completed by means of an intermediate metal foil electrode.
The weld seam 3 is now either welded with the aid of an aluminum foil strip in one operation or with a divisible, stable intermediate electrode which, as in FIG. 10, leaves two openings free, the latter being welded shut by means of an aluminum foil strip after the stable intermediate electrode has been removed.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CH8233559A CH376651A (en) | 1959-12-24 | 1959-12-24 | Method for producing a hollow body and hollow body produced by this method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH8233559A CH376651A (en) | 1959-12-24 | 1959-12-24 | Method for producing a hollow body and hollow body produced by this method |
Publications (1)
Publication Number | Publication Date |
---|---|
CH376651A true CH376651A (en) | 1964-04-15 |
Family
ID=4539676
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH8233559A CH376651A (en) | 1959-12-24 | 1959-12-24 | Method for producing a hollow body and hollow body produced by this method |
Country Status (1)
Country | Link |
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CH (1) | CH376651A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2674074B1 (en) | 2012-03-02 | 2020-02-12 | Intex Marketing Ltd. | Inflatable product with an internal tensioning structure |
US11421434B2 (en) | 2013-07-18 | 2022-08-23 | Intex Marketing Ltd. | Inflatable spa |
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1959
- 1959-12-24 CH CH8233559A patent/CH376651A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2674074B1 (en) | 2012-03-02 | 2020-02-12 | Intex Marketing Ltd. | Inflatable product with an internal tensioning structure |
US11421434B2 (en) | 2013-07-18 | 2022-08-23 | Intex Marketing Ltd. | Inflatable spa |
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