GB2041461A - A slip film for structural purposes and a method of producing such a film - Google Patents

A slip film for structural purposes and a method of producing such a film Download PDF

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Publication number
GB2041461A
GB2041461A GB7941792A GB7941792A GB2041461A GB 2041461 A GB2041461 A GB 2041461A GB 7941792 A GB7941792 A GB 7941792A GB 7941792 A GB7941792 A GB 7941792A GB 2041461 A GB2041461 A GB 2041461A
Authority
GB
United Kingdom
Prior art keywords
synthetic plastics
film
recesses
slip
web
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.)
Withdrawn
Application number
GB7941792A
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.)
ISOGLEITCHEMIE HANDELS GmbH
Original Assignee
ISOGLEITCHEMIE HANDELS GmbH
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 ISOGLEITCHEMIE HANDELS GmbH filed Critical ISOGLEITCHEMIE HANDELS GmbH
Publication of GB2041461A publication Critical patent/GB2041461A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/36—Bearings or like supports allowing movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/746—Slipping, anti-blocking, low friction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness

Abstract

A slip film for structural purposes comprising a pair of synthetic plastics films of which at least one is bonded to a load-distributing layer of synthetic plastics foam and has a plurality of recesses which in accommodate a lubricant medium and extend into the foam layer so that the film remains substantially uniform in thickness, is produced by bringing a web (4) of synthetic plastics foam into coincident relationship with a web (2) of a synthetic plastics film; heating the webs to weld them together under constant pressure, passing the resultant composite web (4, 2), under light pressure, over an embossing roller with the synthetic plastics film in contact with the roller, cooling the composite web (4, 2), incorporating lubricant medium in the embossed receses (3) in the film (2) and covering the latter with another synthetic plastics film (1). <IMAGE>

Description

SPECIFICATION A slip film for structural purposes and a method of producing such a film This invention relates to a slip film for structural purposes and a method of producing it, which slip film comprises a pair of synthetic plastics films, of which at least one is of substantially uniform thickness, is bonded to a load distributing layer of synthetic plastics foam or the like and has a multiplicity of recesses extending into the load distributing layer to accommodate a lubricant medium.
In the building industry, structural beariangs are known which have, at least on one side, slip coatings provided with recesses, perforations, grooves or the like to accommodate lubricants. These bearings are mostly used as single bearings in various sizes, in some cases measuring up to 1 200 X 1 200 mm, for relatively high concentrated loads.
These bearings are manufactured individually by vulcanising the slip coatings, which consist for example of polytetrafluoroethylene or the like, onto rubber plates or the like.
Furthermore, in contrast to single bearings, it is known, for instance in building construction and flat roof structures, to set large area concrete slabs and the like on slip films which in each case, consist of a pair of synthetic plastics films. Between the two synthetic plastics films which form a slip film there is a thin layer (film) of a suitable lubricant agent to improve the sliding properties. In contrast to bridge building, for example, in building construction the slip films, once they have been incorporated, cannot be given any secondary lubrication, so that the duration of their slip properties is determined essentially by the relatively small quantity of lubricant material employed.
German Auslegeschrift No. 2334331 discloses slip films for structural purposes which consist of synthetic plastics material, for example polytetrafluoroethylene. One film is bonded to a load distributing layer and is provided with a multiplicity of recesses which serve to hold a lubricant medium and which extend into the load distributing layer to ensure that the thickness of the film remains substantially constant. These known slip films have proven successful in practice but they have proved to be comparatively expensive to produce since it is in special moulds that they are bonded to the load dispersing layer and provided with the recesses, these last being formed by introducing into the moulds plates which are provided with cup-shaped projections.
Having regard to this state of the art, the invention is concerned with the problem of producing a slip film for structural purposes of the kind referred to in an easy and continuous manner and providing a reliable bond between the load distributing layer and the associated synthetic plastics film. A further problem with which the invention is concerned is the automatic replenishment of the lubricant in known plain bearings.
The first mentioned problem is solved, according to the invention, by bringing a web of synthetic plastics foam or the like into coincident relationship with a web comprising a synthetic plastics film such as for example PVC, polyethylene, etc., heating the two webs to weld them together under constant pressure, passing the resultant composite web, under light pressure, over an embossing roller or the like, cooling the composite web, incorporating lubricant in the recesses formed in the synthetic plastics film by the embossing roller and covering the synthetic plastics film with another synthetic plastics film. The sheetlike slip film thus formed is then cut to the required dimensions. In this way, it is possible to continuously produce slip films which have an extra-ordinarily good slip effect, since the slip properties are retained over a comparatively long period of time.Furthermore, another consequence is that the load distributing layer which furthermore serves to compensate for roughness, unevenness and the like, is shear-resistently bonded to the associated synthetic plastics film so that the usual relative movement between the load distributing layer and the synthetic plastics film of a slip film can no longer occur.
According to a further feature of the invention, the resilience of the web of synthetic plastics foam for the like and the thickness of the synthetic plastics film associated therewith are so related to each other that when a load is applied to the slip film, a slight overpressure is created which forces the lubricant present in the recesses in the synthetic plastics film to the surface of the other synthetic plastics film. The resilience of the layer of synthetic plastics material is dependent on the hardness of the material or the thickness of this layer. Adjustment can be effected by adjusting the stiffness of the synthetic plastics film or the foam layer. It is however, also possible to combine both measures.In this way, it is possible to prevent too resilient an adjustment, so preventing complete compression of the synthetic plastics foam layer and of the top synthetic plastics film, which would lead to the lubricant being expressed from the recesses and so destroy the effect of secondary action.
In order to cool the composite web, the embossing roller or the like may be cooled but it is also possible to introduce a special cooling station. Cooling stabilises the shape of the recesses which is retained during use of the slip film.
The recesses are preferably of cup-shaped form and are preferably disposed in rows, offset in relation to one another, so that all areas of the slip film are constantly lubricated.
According to a further feature of the invention it is possible for both synthetic plastics films of a slip film to be provided with recesses and a load distributing layer. In this case, then, the arrangement is such that the recesses in the two synthetic plastics film are disposed in rows spaced at intervals from one another so that in this way all areas of the slip film are further lubricated.
The second problem with which the invention is concerned is resolved by a slip film of the kind referred to in which the resilience of the web of synthetic plastics foam or the like and the thickness of the synthetic plastics film are so related to each other that when a load is applied to the slip film, a slight overpressure is created with forces the lubricant present in the recesses in one synthetic plastics film to the surface of the other synthetic plastics film. In this way, continuous lubrication of the slip film is ensured over a comparatively long period of time without the lubricant being fully expresed from the recesses during compression of the foam plastics layer and possibly of the synthetic plastics film.
The synthetic plastics foam preferably has a density of 100 to 300 kg/sq.m. The thickness of the webs of synthetic plastics foam preferably amounts to 2.5 to 5 mm.
The synthetic plastics film in which the recesses are provided preferably has a thickness of 100 to 500 y.
One embodiment of the invention will be described in detail with reference to the accompanying drawing which shows a sectional view of a slip film produced in accordance with the invention.
The slip film illustrated consists of two synthetic plastics films 1, 2. The upper synthetic plastics film 2, as viewed in the drawing, is provided with a multiplicity of recesses 3 to hold a supply of lubricant medium, so that as lubricant is used, it is replaced automatically. While the thickness of the synthetic plastics film 2 is maintained constant, the recesses 3 extend into a load distributing layer 4 of synthetic plastics foam which is disposed on the back of the synthetic plastics film 2.
This load distributing layer 4 serves for even distribution of the load, so that this does not act solely on the edges of the recesses 3.
Manufacture is effected by bringing a web of synthetic plastics foam 4 into coincident relationship with a web of synthetic plastics film 2, these webs being taken from a roll and fed over rollers or the like. Once the webs of synthetic plastics film 2 and synthetic plastics foam 4 have been brought together, they pass through a heating zone in which they are welded together to form a composite web.
Then, the composite web is passed over an embossing roller or the like in such a way that the synthetic plastics 2 comes into contact with the surface of the embossing roller so that with constant pressure being exerted on the composite web, the recesses 3 are formed and extend into the synthetic plastics foam 4.
During subsequent cooling, the recesses 3 are stabilised so that they retain the form iliustrated. After incorporation of a lubricant medium, the other synthetic plastics film 1 is supplied in the form of a web which masks the synthetic plastics film 2 and the actual slip film is completed in the form of a web or sheet. This can either be wound onto rolls or can be cut to have desired dimensions imme diately.

Claims (11)

1. A method of produce a slip film for structural purposes, which slip film comprises a pair of synthetic plastics films of which at least one is bonded to a load-distributing layer of synthetic plastics foam or the like and has a multiplicity of recesses to accommodate a lubricant medium, the recesses extending into the load distributing layer so that the synthetic plastics film remains substantially of uniform thickness, characterised by bringing a web of synthetic plastics foam or the like into coincident relationship with a web of a synthetic plastics film, heating the webs to weld them together under constant pressure, passing the resultant composite web under light pressure, over an embossing roller with the synthetic plastics film in contact with the roller, cooling the composite web, incorporating lubricant medium in the embossed recesses in the synthetic plastics film and covering the latter with another synthetic plastics film.
2. A method according to Claim 1, characterised in that the resilience of the web of synthetic plastics foam or the like and the thickness of the synthetic plastics film are so related to each other that upon the slip film being loaded, a slight overpressure is created which forces the lubricant medium present in the recesses in one synthetic plastics film to - the surface of the other synthetic plastics film.
3. A method according to Claim 1 or 2, characterised in that the embossing roller or the like is cooled.
4. A method according to any one of Claims 1 to 3, characterised in that said recesses are cup-shaped and disposed in rows offset from one another.
5. A method according to any preceding claim, characterised in that both synthetic plastics films are provided with recesses and a load distributing layer.
6. A method according to Claim 5, characterised in that the recesses in both the synthetic plastics films are disposed in rows spaced at intervals one from another.
7. A slip film for structural purposes, comprising a pair of synthetic plastics films, of which at least one is of substantially uniform thickness, is bonded to a load distributing layer of synthetic plastics foam or the like and has a multiplicity of recesses extending into the load dispersing layer to hold a lubricant medium, characterised in that the resilience of the synthetic plastics foam or the like and the thickness of the synthetic plastics film bonded thereto are so related to each other that when the slip film is loaded a slight overpressure is created which forces the lubricant medium present in the recesses in one synthetic plastics film to the surface of the other synthetic plastics film.
8. A slip film according to Claim 7, characterised in that the synthetic plastics foam has a density of 100 to 300 kg/sg.m.
9. A slip film according to Claim 7 or 8, characterised in that the thickness of the web of synthetic plastics foam is 2.5 to 5 mm.
10. A slip film according to any one of Claims 7 to 9, characterised in that the synthetic plastics film which is provided with recesses has a thickness of 100 to 500 is.
11. A method of producing a slip film for structural purposes, substantially as hereinbefore described with reference to the accompanying drawing.
1 2. A slip film produced by the method claim in any one of Claims 1 to 6.
1 3. A slip film for structural purposes, substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
GB7941792A 1978-12-04 1979-12-04 A slip film for structural purposes and a method of producing such a film Withdrawn GB2041461A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782852407 DE2852407A1 (en) 1978-12-04 1978-12-04 METHOD FOR PRODUCING A SLIDING FILM FOR CONSTRUCTIONS AND THE SLIDING FILM ITSELF

Publications (1)

Publication Number Publication Date
GB2041461A true GB2041461A (en) 1980-09-10

Family

ID=6056272

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7941792A Withdrawn GB2041461A (en) 1978-12-04 1979-12-04 A slip film for structural purposes and a method of producing such a film

Country Status (3)

Country Link
DE (1) DE2852407A1 (en)
FR (1) FR2443326A1 (en)
GB (1) GB2041461A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1003159B (en) * 1998-06-18 1999-06-21 G M P Co. Ltd Laminator film

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR1003159B (en) * 1998-06-18 1999-06-21 G M P Co. Ltd Laminator film

Also Published As

Publication number Publication date
DE2852407A1 (en) 1980-06-12
FR2443326A1 (en) 1980-07-04

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)