DE10012997B4 - Arrangement of a condensate absorption mat - Google Patents

Abstract

arrangement a condensate absorption mat for receiving and discharging the condensed air humidity on a cold surface in a room, the Mat made of one or more laminate layers of polyester fleece for fixing to the cold surface and the laminate on the room air side facing with an adhesion layer with a surface tension, which is bigger than 70 mN / m, coated.

Description

The The invention relates to an arrangement of a condensate absorption mat to absorb and dissipate condensation water from the humidity on cold surfaces in predominantly closed rooms.

In clear with elements that are lower compared to the higher room temperature Temperature, is known to easily condensation water on the surface the colder elements. The condensation water is formed when on the cold surface of the Elements of the dew point is fallen below.

Especially affected by the formation of condensation water are external elements the rooms like the roofs, the ceilings and the walls.

strongly affected by the formation of condensation water are lightweight buildings with low heat insulation, z. B. halls with roofs and walls from single-shell profile sheets without additional insulation. Especially with insufficient ventilation condensation water can be produced here in larger quantities and uncontrolled drain with unpleasant consequences.

The Dripping condensation water leads to moisture penetration the stored goods; This can damage and spoil the Lead goods. For the same reasons is a production of goods in such halls only limited possible.

To solve this problem, an attempt is made to cover the cold surfaces with systems of mineral-filled, open-pore polymer foams or polyester nonwovens. In these systems, the mineral granules to absorb the condensation water. However, this is limited because the absorption capacity of conventional mineral granules is 0.7 kg / m ² and further recording is not possible. Another use is only possible after a drying process by heating and airing.

In the DE 43 22 747 A1 describes a waterproofing membrane for roofs, which consists of a stretched, microporous membrane made of polyethylene, which is provided on the roof inside side facing with a polyester fleece.

task The present invention therefore was the provision of an arrangement, which can absorb and dissipate the condensation water indefinitely.

to solution The object was an arrangement of a condensate absorption mat for recording and dissipation of the condensed air humidity on a cold surface in one Room found, with the mat of one or more laminate layers Made of polyester fleece for attachment to the cold surface and the laminate on the room air side facing with a adhesion with a surface tension, which is bigger coated as 70 mN / m.

The laminate layers of polyester nonwoven can absorb the condensation water in a much larger amount (1 to 2 kg / m ² , preferably about 1.5 kg / m ² ). In the event that the absorption capacity of the polyester nonwoven fabric is exhausted, the condensation water runs between the laminate layers and can be controlled, for example in a gutter, collected and discharged. In this way, a recording of the condensation water is unlimited possible.

The surface The condensate absorption mats remain dry and uncontrolled dripping the condensation water in the room is omitted.

Unlike the DE 43 22 747 A1 According to the present invention, the arrangement of the layers is opposite. Facing the cold side is a laminate of polyester fleece. The air facing the room side is arranged an adhesion layer.

The Condensate absorption mats contain one or more, preferably 1 to 3, particularly preferably 1 or 2, laminate layers of polyester non-woven.

fleeces of polyester polymers as fiber composites consisting of polyester staple fibers, (Textile Labeling Act, TKG 1.9.1972) are known per se. Polyester polymers consist of linear macromolecules whose At least 85 percent by weight chain from the ester of a diol with terephthalic acid consists; they are formed by polycondensation of glycol with dimethyl terephthalate under deposition of excess glycol. Polyester staple fibers are melt-spun, bypassing staple fiber mats, in the direct processing process, d. H. by mechanical or adhesive hardening to nonwovens to "non woven fabrics "processed.

Preferred as a basis for polyester nonwovens (PES) are terylene types. Terylene types have z. For example, you can set the following properties:
Melting point 256 ° C,
Density 1.38 g / cm ³
Tensile strength of staple fiber p / dtex 3.5-4.0
Elongation at break Spider fiber% 40.0-25.0
Moisture absorption spun fiber% 0.5

These Nonwovens are characterized by a water absorption capacity, which is in the range of up to four times its own weight. The polyester fiber is hydrophobic, the retention volume results from the property in interstices of the fiber fabric, water store. The water retention capacity is by the inner, membranous acting polymeric adhesive layer positive affected. The swelling of the fleece body remains very low.

Furthermore high water absorption capacity These fleeces are characterized by lack of weft and warp threads, (non woven fabrics) by a particularly easy processability, the edge trimming as well as for Absorbtion mats according to the invention necessary lateral sealing can be due to the given thermoplasticity by a hot-roll fixation done.

The Production of laminates from the polyester nonwovens is per se known. The lamination takes place depending on the adhesive system used Dry hot melt or extrusion laminating machines in the transfer process.

The Laminates can For example, it is preferable to prepare 2 polyester nonwoven webs with the help of bonding agents under moderate pressure and glued to laminates. Adhesion promoters can be one- and multi-component reaction adhesives as well as moisture - curing systems based on acrylates and Polyuretanes are used. Preference is given to hot-melt polymer adhesives, through slot dies be applied from the melt phase and after joining and cooling down the webs give an adherent bond. This hot melt - bonded Laminates can due to rapid consolidation ("quick grap") of a direct Further processing supplied become. (Adhesion coating, Perforation, trimming).

The Prefabricated laminates of polyester non-wovens, which for the inventive condensate absorption mats are used, obtained on the air-facing side in a further laminating or coating process, an adhesion layer made of thermoplastic polymers that have a high surface tension exhibit. The surface tension the adhesion layer should if possible the area of surface tension near the water (> 70 mN / m). This ensures that the condensation water on the surface reached a high degree of wetting, no larger drops and forms of the condensate absorption mats is recorded.

The adhesion with high surface tension for the Condensate absorption mats is preferably needled for water absorption (microperforated).

A Needling as a micro-perforation of coatings or films is known in itself. It serves for the targeted local opening of the Surfaces with the proviso a defined permeability for gases and liquids to achieve. The needling is usually in the course of film production or at the end of the coating process, with needle-tipped rollers or stamp, according to specified grid and hole diameter. It was found that a diagonal grid on 5 × 6 × (3) mm and a hole diameter ~ 0.1 mm leads to optimal results.

to increase the surface tension the condensate absorption mats becomes the adhesion layer of an oxidative, preferably subjected to corona treatment. Alternatively, flame treatments with excess oxygen or high-energy xenon light possible.

A Corona treatment is (as a high voltage spark discharge) in itself and can be carried out, for example, as follows: The final coated laminate web to be treated becomes continuous passed through an electron gap, d. H. above a roller at the electrical ground potential and on a high electrical Potential lying electrode system passed over. The electrical voltage is so high that electrical arcing occurs between the electrode system and the roller. The Optimization is done by looking at the surface of the laminate web to be treated at a small distance, (1.5 to 2 mm air gap,) between the electrode gap performs. The high-energy electrons cause air to enter Ozone, oxygen and nitrogen oxides are converted. Electrons on the track surface bounce, break the bonds of the polymer chains by spark erosion on. With these free bonds, the gases of the corona atmosphere react so that predominantly Oxidation reactions take place, affecting the morphology of the surface coating change and a higher one Wettability result.

The Voltage parameters are dependent of polymer material, process temperature and flow rate. At the same throughput ~ 100 mm / sec. were used in polyethylene (LDPE), Polypropylene (PP) voltages of ~ 15 kV for polyurethanes (TPU) Voltages of ~ 5 kV needed. The penetration depth in the modified range is 0.005 μ; TPU points a tactile slight stickiness.

Adhesion layers with high surface tension for the condensate absorption mats be are made of modified films or melt coatings, preferably thermoplastic polyurethanes (TPU), polyolefins, such as polyethylene (LDPE) or polypropylene (PP). Films or melt coatings of polyolefins, such as polyethylene (LDPE), polypropylene (PP) and termoplastic polyurethanes, are known per se.

Prefers for the Production of the absorption mats is using the enamel coating Polyethylene and LDPE types; this is by price, availability, Processability, application-related modification, dyeability, technical characteristics conditionally.

Especially preferred because of their special technical properties for the production of absorption mats according to the invention as a laminating film or melt coating are "thermoplastic polyuretane elastomers" based on tetramethylene oxide and diisocyanates (by polyaddition of C4 ether polyols and MDI, wax-free / wax-reduced). Here, the rotting resistance, adhesion, a high water vapor diffusion rate, elasticity, processability, colorability, Variability, Availability, Call price.

films made of C4 ether TPU for Thermal laminating are also suitable.

The Films of LDPE "polyolefins" and TPU "Thermoplastic Polyurethanes "for the coating The condensate absorption mats are generally used in each case required thickness of 50 to 100 μ on films - glass plants produced.

TPU films in these small thickness ranges due to the polyurethane own high initial tack and the low melt strength with a support foil, preferably be coextruded from polyethylene.

The supporting film is easy to peel off, but because of better processability leave it on the TPU film for as long as possible during further processing.

melting coatings from polyolefins or thermoplastic polyurethanes are in Required pad thickness of 50 to 100 μ by means of extruder and downstream slot die by the order of the hot, homogeneously digested polymer melt produced on the substrate.

The Attach the functional condensate absorption mats the construction surfaces to be protected, the usually coated with zinc or polyester resin varnish, can be hardened quickly by using One- or two-component reaction adhesive based on polyurethanes or methyl methacrylates or by hot melts, hot melt adhesives Basis of highly crystalline thermoplastic polyurethanes (quick grap) or modified polyamides.

The For example, condensate absorption mats can be prepared as follows.

The Base lamination and the surface coating take place on an extrusion laminating machine. Here is about one Wide slot extrusion die the extrusion polymer for the laminate binding, z. As a PU hot melt adhesive, as coating broader Film, from about 25 to 30 μ thick, applied to the first polyester nonwoven web. The extruder and die temperature are at 140 to 160 ° C. The feeder of the substrate takes place via a roller system and a roller.

The second nonwoven web is pressed as a cover, immediately thereafter, by a cooled roller, with about 300 g / cm ² sealing pressure against the covered with hot melt first nonwoven web, cooled and rolled up.

All Setting parameters are dependent from the melt viscosity (MVR) and the set web speed.

The so produced laminate is taken as semi-finished stock, or with appropriate technical requirements directly further processed.

The one-sided application of the adhesive surface coating Made of polyether TPU by melt application on the optimized for this process Extrusion plant. The optimization of the coating for smooth or textured surface after passing through a short pre-cooling section at room temperature and a downstream, chilled Smooth or embossing roll achieved. The optimal support thickness for the condensate Absorbent Mat is between 50 and 70 μ for C4-ether polyurethane.

The Optimization of the surface by Corona treatment and needling occurs when process technology possible in another subsequent operation.

alternative on the same plant can fleece lamination with HDPE or high-pressure polyethylene and surface coating with LDPE or PP, Polypropylene in the temperature range from 120 to 130 ° C take place.

Hot-Melts-Streupulver are another alternative. These free-flowing polymer powder particles with a size of 100 to 600 microns are effective when heated by heat, for. B. by Heating channel, IR emitter or process heat to be activated. The temperature in the joint gap should be 130 to 150 ° C for HDPE and 150 to 170 ° C for TPU. The sealing pressure is at a sealing time of 10 to 15 seconds. For HDPE 200 g / cm for TPU 300 to 400 g / cm ^2.

object The present invention also contemplates the use of condensate absorption mats with one or more laminate layers of polyester nonwoven, wherein the laminate on one side with a high surface tension adhesive layer coated to cover cold surfaces.

On the cold surfaces Effectively the condensation water is absorbed and can be controlled dissipated become.

Claims (8)

Arrangement of a condensate absorption mat for Absorption and dissipation of condensed air humidity on a cold surface in a room, the mat being one or more laminate layers Made of polyester fleece for attachment to the cold surface and the laminate on the air-facing side with an adhesion layer with a surface tension, the is larger than 70 mN / m, coated. Arrangement according to claim 1, characterized that the condensate absorption mat 2 to 3 layers of laminate Non-woven polyester having. Arrangement according to claim 1 or 2, characterized in that the polyester fleece is used with a water absorption capacity in the range of 1 to 2 kg / m ² . Arrangement according to one of claims 1 to 3, characterized that the polyester fleece of the type PES polyester spunbonded NonWoven Fabrics is. Arrangement according to one of Claims 1 to 4, characterized that the adhesive layer is needled is. Arrangement according to one of Claims 1 to 4, characterized that the adhesion layer of a Corona treatment has been subjected. Arrangement according to one of Claims 1 to 4, characterized that the adhesion layer of a has been subjected to oxidative treatment. Arrangement according to one of claims 1 to 7, characterized that as an adhesion layer foils or melt coatings of polyolefins are used.