SE446612B - COATING MATERIAL FOR RORISOLATION CONSISTING OF A POLYOLEFINE-BASED BEAR LAYER AND DIFFUSION-OWN LAYER - Google Patents

Description

446 612 a material which, from a technical specification point of view as well as with regard to economics, from both a material cost point of view and a production cost point of view, meets the requirements that should be imposed on materials of the type in question today.

The invention therefore provides a surface covering material in flexible laminate form intended for pipe insulation, and which comprises a carrier layer and a surface layer of preferably diffusion-tight material, for example metal foil. The material is characterized in that the carrier layer consists of a layer of polyolefin base added with inorganic filler, where the filler is present in a relatively high content of up to approximately 60% by weight, preferably 40% by weight.

Because the filler content is at a high level, a polyolefin material prepared in this way offers the desired material properties in this context, both from a mechanical and fire resistance point of view.

The inorganic filler consists, for example, of chalk, lime, kaolin or other material or a combination of materials with corresponding properties.

The thickness of the carrier layer is in the range 100 - 700 p, preferably about 300 p, and the layer is suitably laminated to a surface layer of aluminum with a thickness of 10 to 70 p, preferably no p.

To facilitate surface cladding material ß ß application around a pipeline, the layers are suitably laminated with a certain mutual prestress to provide so-called ourling in the machine direction.

The laminate preferably has a longitudinal and transverse tensile strength of at least 100 N, a modulus of elasticity of at least 150 N / mm 2 in both longitudinal and transverse directions and a tear strength of at least 50 N.

In a preferred embodiment, the carrier layer consists of polypropylene, which has been given an addition of 00% by weight of chalk.

Since the manufacture of the new laminate according to the invention is done using conventional lamination technology in laminators of known type, a description of the exact manufacturing procedure need not be made. It is worth mentioning, however, that the operation is such that the web stresses of the male urns intended for lamination are adjustable to produce a suitable so-called curling in the machine direction. The metal foil, which is suitably a 1A1 foil, thus forms the surface layer of the cladding material and can be varnished if necessary in connection with the lamination procedure in order to provide maximum flame protection. The main tasks of aluminum foil in other respects are to form a diffusion barrier and minimize radiation losses.

The carrier layer gives the laminate its mechanical properties, including that it meets the requirements for high fire resistance and low smoke generation. The filler-added carrier layer is otherwise largely manageable in the lamination process in the same way as ordinary "clean", flexible webs of polypropylene, polyethylene, PVC, etc.

Exemgel Using a laminator with i.a. separate web tension control and otherwise extensive conventional facilities in the field, a surface coating material was manufactured from a 300 p polypropylene film with 40% by weight addition of chalk and a 40 p Al foil.

The surface cladding material showed the following measurement values: Density> 1.0 g / cm3 Surface weight 501 g / mg Tensile strength wngs 1ho N across 122 N Elongation at break along l1.1% across 7.1% E-modulus along IRU N / mmg across 21+: N / mmz Tear strength along 111 N across 76 N Water vapor passage O g / m2 125% / 75 94 RH The surface cladding material was applied to a mineral wool insulation and a fire test according to NORDTEST fire testing method Ä (SIS 02 # 8 23) was performed by Statens Pruvuings- 446 612 anstalt.

The material was found to meet the requirements for surface layers class 1 according to SBN 80. Even if only a concrete exemplary embodiment has been given, it will be appreciated that modifications and alternatives are possible, and the intention is that such should fall within the scope of the appended claims.

Claims (6)

446 612 P a t e n t k r a v Surface cladding material in flexible laminate form, intended as an outer layer for pipe insulation, comprising a carrier layer and a surface layer of diffusion-tight material, for example metal foil, characterized in that the carrier layer consists of an inorganic filler layer with polyolefin base, where the filler is present in relatively high content of up to about 60% by weight, preferably ÄH% by weight. Material according to claim 1, characterized in that the filler consists of chalk, lime, kaolin or other corresponding material. Material according to claim 2, characterized in that the carrier layer has a thickness in the range 100 - 700 μm, preferably about 300, μm, and that the carrier layer is laminated to a surface layer of aluminum with a thickness of 10 - 700 μm. 70 pm, preferably ÄQ p m. 4. M. Material according to claim 3, characterized in that the layers are laminated with a certain mutual prestress to achieve so-called curling in the machine direction. Material according to one or more of the preceding claims, characterized in that the laminate has a tensile strength in both longitudinal and transverse direction of at least 100 N, a modulus of elasticity of at least 150 N / mmg in both longitudinal and transverse and tear strength. of at least 50 N. Material according to one or more of the preceding claims, characterized in that the carrier layer consists of polypropylene filled with up to # 0% by weight of chalk.