NO301030B1 - Overlap joints between tablecloths and method of cutting weldable tablecloths - Google Patents

Overlap joints between tablecloths and method of cutting weldable tablecloths Download PDF

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Publication number
NO301030B1
NO301030B1 NO962684A NO962684A NO301030B1 NO 301030 B1 NO301030 B1 NO 301030B1 NO 962684 A NO962684 A NO 962684A NO 962684 A NO962684 A NO 962684A NO 301030 B1 NO301030 B1 NO 301030B1
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NO
Norway
Prior art keywords
welding zone
seams
weld
tablecloths
wire
Prior art date
Application number
NO962684A
Other languages
Norwegian (no)
Other versions
NO962684A (en
NO962684D0 (en
Inventor
Torstein G Christensen
Jan Halvorsen
Jan Fr Fosse
Original Assignee
Nordic Water Supply Asa
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 Nordic Water Supply Asa filed Critical Nordic Water Supply Asa
Priority to NO962684A priority Critical patent/NO301030B1/en
Publication of NO962684D0 publication Critical patent/NO962684D0/en
Priority to EP97924398A priority patent/EP0918620A1/en
Priority to AU29824/97A priority patent/AU2982497A/en
Priority to PCT/NO1997/000145 priority patent/WO1997049541A1/en
Publication of NO962684A publication Critical patent/NO962684A/en
Publication of NO301030B1 publication Critical patent/NO301030B1/en

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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
    • B29C65/72—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by combined operations or combined techniques, e.g. welding and stitching
    • 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
    • B29C66/70—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
    • B29C66/729—Textile or other fibrous material made from plastics
    • 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
    • B29C65/62—Stitching
    • 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
    • B29K2313/00—Use of textile products or fabrics as reinforcement

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)

Description

Foreliggende oppfinnelse angår sammenføyning av dukmaterialer. The present invention relates to the joining of fabric materials.

I sammenføyde duker er ofte selve sammenføyningene kritiske områder, enten når det gjelder tetning eller styrke, eller begge deler. For duker av sveisbare materialer, eller som har et sveisbart ytre sjikt, benyttes blant annet overlappsveising, idet det dannes en langstrakt sveisesone i et overlappområde for dukene. Det er dessuten kjent å danne trådsømmer i slike sveiseskjøter. Videre er det kjent å dekke en slik trådsøm med et duklag, som sveises, for å unngå lekkasje av væske gjennom hullene som dannes av trådsømmen. Trådsømmens oppgave er hovedsakelig å utgjøre en mekanisk forsterkning. Trådpartiene som rager gjennom de overlappende duklagene vil i sammenføyde duker som ikke er utsatt for noen strekkbelastning langs dukenes plan og på tvers av sveiseskjøten befinne seg hovedsakelig vinkelrett gjennom dukene, i allefall når de ses i et tverrsnitt av sveiseskjøten. I slike posisjoner har disse trådpartiene ingen evne til å overføre krefter langs dukenes plan på tvers av sveiseskjøten. Først når skjøten er strukket i tverretningen vil trådpartiene befinne seg i en skråstilling i forhold til dukenes plan, og kan dermed overføre krefter mellom duklagene i dukenes plan. Ved strekkbelastning av sveisede overlappskjøter vil strekkreftene utgjøre et kraftpar, på grunn av tykkelsen til duklagene, slik at skjøtområdet vil bli noe dreid av et moment om en midtre lengdeakse gjennom sveisesømmen, i forhold til dukplanene utenfor skjøtområdet. Dermed vil sveisesømmen innta en viss skråstilling i forhold til dukplanene, og sveisesømmen blir utsatt for en kraftkomponent som virker vinkelrett på sveisens plan, samtidig med at sveisen utsettes for skjærbelastning langs sitt plan. En trådsøm i sveisesømmen vil ha liten virkning overfor de påkjenninger som sveisesømmen utsettes for. Trådsømmen vil kunne klemme duklagene sammen langs sveisen, men dette vil ikke minske konsentrasjonen av spenninger ved den såkalte sveisetåen, dvs. den langsgående kanten av sveisesømmen. In jointed fabrics, the joints themselves are often critical areas, either in terms of sealing or strength, or both. For cloths made of weldable materials, or which have a weldable outer layer, overlap welding is used, among other things, as an elongated welding zone is formed in an overlap area for the cloths. It is also known to form thread seams in such welding joints. Furthermore, it is known to cover such a wire seam with a cloth layer, which is welded, in order to avoid leakage of liquid through the holes formed by the wire seam. The thread stitch's task is mainly to constitute a mechanical reinforcement. The wire sections projecting through the overlapping fabric layers will, in joined fabrics that are not subjected to any tensile load along the plane of the fabric and across the weld joint, be mainly perpendicular through the fabric, at least when viewed in a cross-section of the weld joint. In such positions, these wire sections have no ability to transfer forces along the plane of the fabric across the weld joint. Only when the joint is stretched in the transverse direction will the thread parts be in an inclined position in relation to the plane of the cloths, and can thus transfer forces between the cloth layers in the plane of the cloths. In the case of tensile loading of welded lap joints, the tensile forces will form a force couple, due to the thickness of the fabric layers, so that the joint area will be somewhat rotated by a moment about a central longitudinal axis through the weld seam, in relation to the fabric planes outside the joint area. Thus, the weld seam will assume a certain slant in relation to the fabric planes, and the weld seam will be exposed to a force component that acts perpendicular to the plane of the weld, at the same time that the weld is exposed to shear stress along its plane. A wire stitch in the weld seam will have little effect on the stresses to which the weld seam is exposed. The wire seam will be able to squeeze the fabric layers together along the weld, but this will not reduce the concentration of stresses at the so-called weld toe, i.e. the longitudinal edge of the weld seam.

I henhold til oppfinnelsen er det kommet frem til at en langstrakt sveisesone mellom to overlappende duklag effektivt kan forsterkes med hensyn til utmatting ved anordningen av trådsømmer utenfor hver side av sveisesonen, en eller flere trådsømmer langs hver side, hovedsakelig umiddelbart inntil sveisesonen eller i en liten avstand fra denne. Med en slik sammenføyning økes levetiden, sammenlignet med kun sveis eller en sveis hvor sømmene befinner seg i selve sveisen. Avstanden mellom kantene av sveisesonen og trådsømmene, eller de nærmeste trådsømmer når det benyttes to eller flere trådsømmer på hver side av sveisesonen, kan variere, f.eks. i avhengighet av dukenes tykkelse og bredden av sveisesonen. Avstanden kan f.eks. være fra noen få mm til noen titalls mm. Det vesentlige er at trådsømmene skal avlaste sveisesonen for belastninger. According to the invention, it has been concluded that an elongated welding zone between two overlapping fabric layers can be effectively reinforced with regard to fatigue by the arrangement of wire seams outside each side of the welding zone, one or more wire seams along each side, mainly immediately next to the welding zone or in a small distance from this. With such a joining, the service life is increased, compared to only a weld or a weld where the seams are located in the weld itself. The distance between the edges of the welding zone and the wire seams, or the nearest wire seams when two or more wire seams are used on each side of the welding zone, can vary, e.g. depending on the thickness of the sheets and the width of the welding zone. The distance can e.g. be from a few mm to a few tens of mm. The essential thing is that the wire seams must relieve the welding zone of loads.

Når et slikt skjøtområde utsettes for strekk i tverretningen, vil hvert duklag være noe sammenklemt av trådsømmene, noe som forhindrer at det oppstår normalspenninger ved sveisetå. When such a joint area is subjected to tension in the transverse direction, each fabric layer will be somewhat compressed by the wire seams, which prevents normal stresses from occurring at the weld toe.

Kombinasjonen av en sveisesone og sømmer utenfor sveisesonen gir en forbedring i forhold til en sveisesone uten søm som mht. levetid kan uttrykkes med en faktor på 100. The combination of a welding zone and seams outside the welding zone provides an improvement compared to a welding zone without a seam as regards lifetime can be expressed by a factor of 100.

Kombinasjonen av en sveisesone og sømmer utenfor sveisesonen gir en meget vesentlig forbedring i forhold til kombinasjonen av en sveisesone og sømmer innenfor sveisesonen. The combination of a welding zone and seams outside the welding zone provides a very significant improvement compared to the combination of a welding zone and seams within the welding zone.

I hver sveisetå i en sveisesone oppstår en konsentrasjon av skjærspenning når skjøten utsettes for strekk på tvers av skjøten. For en skjøt uten sømmer utenfor sveisesonen vil skjøten utsettes for en utrivingstendens ("peeling") som gir krefter lateralt på dukplanet og som medfører store tøyninger av duken ved hver sveisetå. Ved å legge sømmen utenfor sveisen vil en klemme sammen duklagene og effektivt hindre spenninger normalt på duken. In each weld toe in a weld zone, a concentration of shear stress occurs when the joint is subjected to tension across the joint. For a joint without seams outside the welding zone, the joint will be exposed to a stripping tendency ("peeling") which gives forces laterally on the fabric plane and which causes large strains of the fabric at each weld toe. By placing the seam outside the weld, the fabric layers will be clamped together and effectively prevent normal stresses on the fabric.

For en skjøt med sømmer innenfor sveisesonen vil de små tøyninger som opptrer innenfor sveisesonen medføre at sømmene har liten virkning. Dette skyldes at sømmene først kommer til virkning når de skråstilles (sett langs sveisesonen). Med en strekkraft S og en sømvinkel på 0 i forhold til en retning vinkelrett på dukplanet vil hver søm gi et kraftbidrag på F= S sin 6. Med sømmer utenfor hver sveisetå vil dukdeformasjonene være store i sømområdene, og følgelig vil vinkelen 6 være stor. Følgelig vil hver søm gi et stort kraftbidrag, hvilket bidrar til å jevne ut spenningstoppene i hver sveisetå. En slik utjevning av spenningstopper er vesentlig for å øke levetiden for en skjøt. For a joint with seams within the welding zone, the small strains that occur within the welding zone will mean that the seams have little effect. This is because the seams only come into effect when they are tilted (seen along the welding zone). With a tensile force S and a seam angle of 0 in relation to a direction perpendicular to the fabric plane, each seam will give a force contribution of F= S sin 6. With seams outside each weld toe, the fabric deformations will be large in the seam areas, and consequently the angle 6 will be large. Consequently, each seam will provide a large force contribution, which helps to smooth out the stress peaks in each weld toe. Such an equalization of voltage peaks is essential to increase the service life of a joint.

Oppfinnelsen skal i det følgende forklares nærmere ved hjelp av et eksempel vist på den vedføyde tegning. In the following, the invention will be explained in more detail using an example shown in the attached drawing.

Figuren viser skjematisk og forstørret et snitt gjennom en skjøt i henhold til oppfinnelsen, på tvers av en sveisesøm. The figure shows schematically and enlarged a section through a joint according to the invention, across a weld seam.

To duker 1 og 2, som hver, med stiplede linjer, er vist med en indre forsterkning 3, 4, f.eks. en fiberarmering, ligger mot hverandre i et overlappområde, der dukene er sammenføyd i en sveisesone 5. I en liten avstand utenfor hver side av sveisesonen 5 er det dannet trådsømmer 6 og 7 langs sveisesonen 5, i det viste eksempel to sømmer på hver side av sveisesonen 5. Skjøten er dannet ved at dukene 1 og 2 først er lagt overlappende mot hverandre og sveiset sammen i sveisesonen 5, hvoretter trådsømmene 6, 7 er sydd langs sveisesonen 5, i en viss avstand fra denne. Two cloths 1 and 2, each of which, with dashed lines, is shown with an internal reinforcement 3, 4, e.g. a fiber reinforcement, lie against each other in an overlap area, where the fabrics are joined in a welding zone 5. In a small distance outside each side of the welding zone 5, wire seams 6 and 7 are formed along the welding zone 5, in the example shown two seams on each side of the welding zone 5. The joint is formed by first laying the fabrics 1 and 2 overlapping each other and welding them together in the welding zone 5, after which the thread seams 6, 7 are sewn along the welding zone 5, at a certain distance from it.

Dersom skjøten utsettes for strekkbelastning i skjøtens tverretning, dvs. at dukene 1 og 2 utsettes for krefter henholdsvis mot høyre og venstre slik de er vist, vil trådsømmene 6 og 7 avlaste sveisesonen 5. Sveisesonen 5 vil primært bli belastet med skjærkrefter og deformeres noe, ved å tøyes i kraftretningen. Dermed vil trådpartiene som forløper gjennom duklagene 1 og 2, og som i ubelastet tilstand hovedsakelig danner rette vinkler med duklagene når de ses i det viste snitt, bli noe skråstilt, slik at trådpartiene blir i stand til å oppta noe av strekket. De mest kritiske partier av sveisesonen 5 med hensyn til spenninger ved en slik belastning er kantpartiene av sveisesonen, den såkalte sveisetåen langs hver side. Når det benyttes sveis uten trådsøm eller sveis med trådsøm i selve sveisesonen, vil denne være utsatt for sprekkdannelse ved stadige belastninger, og disse sprekker vil spre seg innover i sveisen og svekke denne betydelig. Når trådsømmen eller - sømmene befinner seg hovedsakelig umiddelbar utenfor sveisen hindres det at sprekkdannelse oppstår, ettersom trådsømmen eller - sømmene opptar normalkreftene og holder duklagene sammen. På denne måten økes levetiden for sammenføyningen vesentlig. If the joint is subjected to a tensile load in the transverse direction of the joint, i.e. that the fabrics 1 and 2 are subjected to forces respectively to the right and to the left as shown, the wire seams 6 and 7 will relieve the welding zone 5. The welding zone 5 will primarily be loaded with shear forces and will be deformed somewhat, by stretching in the direction of force. Thus, the wire sections which extend through the fabric layers 1 and 2, and which in the unloaded state mainly form right angles with the fabric layers when seen in the section shown, will be somewhat inclined, so that the wire sections will be able to absorb some of the tension. The most critical parts of the welding zone 5 with regard to stresses at such a load are the edge parts of the welding zone, the so-called welding toe along each side. When welding without a wire seam or welding with a wire seam is used in the welding zone itself, this will be exposed to crack formation due to constant loads, and these cracks will spread inwards into the weld and weaken it significantly. When the wire seam or seams are mainly located immediately outside the weld, cracking is prevented, as the wire seam or seams absorb the normal forces and hold the fabric layers together. In this way, the service life of the joint is significantly increased.

Prinsippet kan anvendes på flere områder, slik som for telt, klesplagg, sekker og presenninger. En særlig anvendelse er for store poser til bruk for oljeoppsamling og for frakting av vann til sjøs, og hvor det er fare for utmatting ved stadige belastninger. The principle can be applied in several areas, such as for tents, clothing, bags and tarpaulins. A particular application is for large bags to be used for oil collection and for transporting water at sea, and where there is a risk of fatigue due to constant loads.

Claims (2)

1. Overlappskjøt mellom duker (1,2) som er sammensveiset i en langstrakt sveisesone (5), idet det parallelt med sveisesonen (5) er dannet trådsømmer (6, 7), karakterisert ved at trådsømmene (6, 7) befinner seg langs hver side av sveisesonen (5), utenfor sveisesonen (5).1. Overlap joint between cloths (1,2) which are welded together in an elongated welding zone (5), as wire seams (6, 7) are formed parallel to the welding zone (5), characterized in that the wire seams (6, 7) are located along either side of the welding zone (5), outside the welding zone (5). 2. Fremgangsmåte ved skjøting av sveisbare duker, omfattende at to duker (1,2) legges overlappende mot hverandre og sveises i en langstrakt sveisesone (5), idet det parallelt med sveisesonen dannes trådsømmer (6, 7), karakterisert ved at trådsømmene (6, 7) dannes langs hver side av sveisesonen (5), utenfor sveisesonen (5).2. Procedure for splicing weldable cloths, comprising two cloths (1,2) being placed overlapping each other and welded in an elongated welding zone (5), as wire seams (6, 7) are formed parallel to the welding zone, characterized in that the wire seams (6, 7) are formed along each side of the welding zone (5), outside the welding zone (5).
NO962684A 1996-06-25 1996-06-25 Overlap joints between tablecloths and method of cutting weldable tablecloths NO301030B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NO962684A NO301030B1 (en) 1996-06-25 1996-06-25 Overlap joints between tablecloths and method of cutting weldable tablecloths
EP97924398A EP0918620A1 (en) 1996-06-25 1997-06-06 A lap joint between fabrics and a method of joining weldable fabrics
AU29824/97A AU2982497A (en) 1996-06-25 1997-06-06 A lap joint between fabrics and a method of joining weldable fabrics
PCT/NO1997/000145 WO1997049541A1 (en) 1996-06-25 1997-06-06 A lap joint between fabrics and a method of joining weldable fabrics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO962684A NO301030B1 (en) 1996-06-25 1996-06-25 Overlap joints between tablecloths and method of cutting weldable tablecloths

Publications (3)

Publication Number Publication Date
NO962684D0 NO962684D0 (en) 1996-06-25
NO962684A NO962684A (en) 1997-09-01
NO301030B1 true NO301030B1 (en) 1997-09-01

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ID=19899560

Family Applications (1)

Application Number Title Priority Date Filing Date
NO962684A NO301030B1 (en) 1996-06-25 1996-06-25 Overlap joints between tablecloths and method of cutting weldable tablecloths

Country Status (4)

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EP (1) EP0918620A1 (en)
AU (1) AU2982497A (en)
NO (1) NO301030B1 (en)
WO (1) WO1997049541A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE950738T1 (en) * 1998-03-02 2000-06-08 Orusen Tokio Tokyo Kk Weldable tissue

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2592463A (en) * 1946-10-10 1952-04-08 Warner Brothers Co Machine for cutting, processing, and/or seaming fabric or like sections and product thereof
US2962082A (en) * 1955-10-10 1960-11-29 Donat J Lenney Method and means for sealing seams
FI73011C (en) * 1983-09-12 1987-08-10 Lasse Liukko FOERFARANDE FOER TILLVERKNING AV EN SOEM.

Also Published As

Publication number Publication date
WO1997049541A1 (en) 1997-12-31
NO962684A (en) 1997-09-01
EP0918620A1 (en) 1999-06-02
AU2982497A (en) 1998-01-14
NO962684D0 (en) 1996-06-25

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