Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Scrim – Woven scrim
Utility Patent
1998-04-29
2001-01-02
Morris, Terrel (Department: 1771)
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Scrim
Woven scrim
C442S020000, C442S027000, C428S102000, C428S103000, C052S005000, C052S042000, C052S417000, C052S454000
Utility Patent
active
06169042
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a plastering fillet of plastics material, having attached thereto a net reinforcing material to be embedded in or underneath a plaster layer, in particular a plaster layer on the thermal insulation of a building wall.
BACKGROUND OF THE INVENTION
Such plastering fillets are known. For attaching net reinforcing material thereto, either adhering to or providing a type of clamping connection between the basic body of the plastering fillet and a supplementary fillet is used so far in practical application. The first possibility mentioned first results in attachment with not always result in satisfactory strength. The second possibility involves great expenditure in its manufacture, since the basic body of the plastering fillet and the supplementary fillet must be adapted for the clamping function.
BRIEF SUMMARY OF THE INVENTION
It is the object of the invention to make available a plastering fillet of the type indicated at the outset which distinguishes itself by a safe, firm attachment of the reinforcing material and involves little expenditure in manufacture.
To meet this object, the plastering fillet according to the invention is characterized in that the reinforcing material is connected to the plastering fillet by means of at least one plastics strand, with the reinforcing material having been interposed between the plastering fillet and the plastics strand when the connection is made, and with a material-uniting connection being established between the plastering fillet and plastics strand. For establishing the material-uniting connection between plastering fillet and the plastics strand, the “net openings” of the reinforcing material are utilized. At these locations, the material of the plastering fillet and the material of the plastics strand can be bonded together in a material-uniting manner. There is no interference from the reinforcing material because it consists of a different material than the plastering fillet and the plastics strand (which is very often the case).
The preferred types of the material-uniting connection are connections made in the softened plastics state, in particular welding connections or connections produced by pressing together materials in an at least surface-softened state, and adhesive connections, in particular adhesive connections with the aid of a hot melt-type adhesive. Additionally, a special case is the coextrusion of the plastering fillet and the plastics strand. The reinforcing material is continuously introduced between the plastering fillet and the plastics strand which are still soft from the extrusion operation, and the components mentioned are united by pressing them together.
Very highly preferred is the formation of the connection as an ultrasonic welding connection. Ultrasonic welding is a type of connection in which the heating required in the welding region for connecting the two components is generated by the effect of ultrasonic oscillations. The development work that led to the invention has shown that, due to the presence of at least one plastics strand, an ultrasonic welding connection with high bonding strength is produced that can be made within a short period of time.
On the other hand, it is expressly disclosed herein that the plastering fillet according to the invention can be restricted to attachment of the reinforcing material to the plastering fillet designed in accordance with the characterizing part of claim
1
, however excluding an ultrasonic welding connection.
The connection preferably comprises at least one additional plastics strand on the side of the plastering fillet opposite the reinforcing material. This measure is particularly advantageous when the plastering fillet has perforations in the bonding region, so that the additional plastics strand provides an increase in stability of the connection. When no additional plastics strand is present, it may be advantageous to arrange the connection in a portion (portions) where the plastering fillet has no perforations.
The connection, in particular the welding or ultrasonic welding operation, can be made easiest when the plastering fillet and the plastics strand and, respectively, the additional plastics strand are made of the same plastics material or at least of plastics materials that are similar with respect to their melting temperature. The plastering fillet and the plastics strand and, respectively, the additional plastics strand consist preferably of thermoplastic plastics materials. The reinforcing material preferably is a glass-silk or glass-filament fabric, as is known. However, other reinforcing materials, e.g. of other fibers than glass fibers or plastics threads, are possible as well. According to the invention, a plastering fillet of thermoplastic plastics material can be securely connected to the glass-filament fabric as reinforcing material that is extremely different therefrom in terms of material.
In most cases the reinforcing material attached to the plastering fillet extends substantially along the entire length of the plastering fillet and has a width—as measured transversely of this longitudinal direction—of 10 to 40 cm. This width is dimensioned such that a large-area, net reinforcing material for the plaster layer can be disposed in overlapping manner adjacent the reinforcing material attached to the plastering fillet.
The most preferred materials are glass-filament fabric for the reinforcing material and polyvinyl chloride for the plastering fillet and the at least one plastics strand and, respectively, the at least one additional plastics strand. However, other material combinations can be used as well without a problem when the aspects outlined hereinbefore are taken into consideration.
It is preferably possible to use one or more plastics strands and, respectively, additional plastics strands having the configuration of a round cord. As an alternative thereto, plastics strands of different cross-section, e.g. flat strip cross-section, can be utilized. Moreover, it is possible to make use of a composite arrangement of a plurality of plastics strands, e.g. two or more strands, that are interconnected by a flat web.
A sufficiently stable attachment of the reinforcing material to the plastering fillet can be achieved by means of one plastics strand and, respectively, one additional plastics strand. By means of two plastics strands or, respectively, two additional plastics strands, preferably beside each other with a certain spacing, an optimum between manufacturing expenditure and secure attachment is obtained in many cases. When the plastering fillet—as seen in cross-section—has two legs, preferably two plastics strands or two additional plastics strands, respectively, are provided per leg.
Preferably at least one of the plastics strands and/or at least one of the additional plastics strands is of such a height that it can be used as smoothing edge upon application of a filler layer. The plastics strand or the additional plastics strand, respectively, thus has a smoothing edge function in addition to its role in establishing the welding connection; as a result thereof, the provision of a smoothing edge integral with the basic plastering fillet can be dispensed with in may cases. Preferred heights are 0.5 to 5 mm, most preferably 1 to 3 mm.
The provision of a smoothing edge is also particularly advantageous since the net reinforcing material, in particular glass-filament fabric, usually is provided with a coating or impregnation making it alkali-resistant. When, without the provision of a smoothing edge, uncareful scratching takes place on the reinforcing material with the application tool for applying the filler, this coating or impregnation suffers damage, and the reinforcing material then is no longer perfectly alkali-resistant and may be attacked by the filler material or the plaster layer.
The plastering fillet according to the invention can be used in many fields “in the building trade”, where reinforcing material attached to the plastering fillet is useful for embedding in or un
Kinberg Robert
Morris Terrel
Singh Arti R.
Spencer George
Venable
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