Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including interlaminar mechanical fastener
Patent
1993-09-16
1995-08-29
Withers, James D.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including interlaminar mechanical fastener
428 361, 428 362, 428238, 428251, 428282, 428285, 428302, B32B 1702, B32B 506, D04H 116
Patent
active
054458757
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a laminate of that type being utilized for lining passages which are entirely or partially surrounded by walls, above or under the ground, for instance pipelines for a water system and a sewerage for instance, channels of different kinds, for instance for ventilation in buildings, and/or for manufacturing such passages, channels and pipes in a factory or in a place out in the field and which laminate comprises a curable resin positioned between two plastic foils or plastic films and at least one reinforcement layer of continuous fibre wires.
DESCRIPTION OF CONVENTION ART
Such laminates for lining of pipelines excavated down into the ground are previously known and normally have the design of a flexible lining hose which is either drawn into the pipeline and is then expanding against the inside of the pipeline by means of a pressure medium or is everted into the pipeline by means of a pressure medium, whereafter the entirely everted lining hose is kept expanded against the inside of the pipeline of the utilized pressure medium in order to make the lining hose or the lining laminate to be adapted to the mentioned inside. This pressure is maintained at least until the resin has been cured to such extent that the lining laminate has become entirely formstable.
The utilized pressure medium normally is air and/or water and in a heated condition this pressure medium is also utilized for carrying out or accelerating the initiating of the cure of the resin and with the plastic material type or resin type, used most times for this purpose, the cure generally continues in a natural way until the curing process has been completed.
Due to the fact that this type of cure, i.e. heat cure, requires a plentiful equipment and is expensive as a result of the necessary heating of utilized medium and takes a long time to carry out, radiation energy in the form of light has lately begun to be used for curing of the curable resin, being a part of the lining laminate, which resin is preparated in a way intended for that with suitable curing systems, catalysts, accelerators and so on for achieving a through-cure which is made as rapid as possible.
Independently of curing ways, however, the lining laminate after the cure, i.e. when the lining is finished, has to satisfy certain strength requirements and have a resistance to corrosion in order to be able to manage the environments are decades that it is intended for without being destroyed in one or another respect. This is true especially for such laminates which are intended for lining sewer pipes. Such linings have to be resistant to corrosion and also to have a necessary strength and particularly compression strength and stability in order to be able to resist the compression strains and loads which they are constantly exposed to from above, for instance from traffic.
To be able to unite strength to inner and outer loads, especially compression strength, as well as resistance to corrosion in one and the same lining laminate has caused to great problems. Up to now the lining laminates in the market have either better strength than resistance to corrosion or the contrary, i.e. a better resistance to corrosion than strength, especially compression strength. Furthermore, known lining laminates have that drawback that they are often inflexible regarding the variations of the dimensions of the lining object.
SUMMARY OF THE INVENTION
The purpose of this invention is therefore to solve that problem and accordingly bring about a lining laminate having a good strength as well as corresponding resistance to corrosion and flexibility. This purpose has been achieved by the fact that lining laminate according to this invention has the characterizing features defined in the following claims.
BRIEF DESCRIPTION OF DRAWINGS
In the following the invention is described more closely with reference to accompanying drawings, in which
FIG. 1 shows a section through a known, hose-shaped lining laminate on which this invention is based;
FIGS. 2 a
REFERENCES:
patent: 4670315 (1987-06-01), Hillemeier et al.
patent: 4678699 (1987-07-01), Kritchevsky et al.
patent: 4723579 (1988-02-01), Hyodo et al.
patent: 4892774 (1990-01-01), Vallance
patent: 4927684 (1990-05-01), Asensio et al.
Inpipe Sweden AB
Withers James D.
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