Stock material or miscellaneous articles – Sheets or webs edge spliced or joined – Sheets or webs coplanar
Patent
1982-09-13
1984-03-06
McCamish, Marion
Stock material or miscellaneous articles
Sheets or webs edge spliced or joined
Sheets or webs coplanar
1563041, 1563043, 428 60, 428192, 428294, 428295, C09J 510, D06H 500
Patent
active
044354576
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a non-woven fabric made of a thermoplastic material and seamed by means of melt-seaming, said fabric consisting of at least two strips of fabric positioned side by side in the same plane and joined to each other at their opposite overlapping edges by means of a melt seam.
When needled non-woven fabrics are manufactured, the narrowness of the production line often imposes restrictions on the use of the fabrics. A sufficient width is required, e.g., from a felt carpet intended for covering of a floor. Likewise, when a needled filter fabric is used, some objects may require a wider fabric than what can be produced without seaming. An ordinary width of a carding frame is 2 to 2.5 meters. In the objects mentioned above, a mat of a width of at least 5 meters is often required.
In prior art it is known to use a hot-melting material between the fabric strips when joining the strips firmly together. The material to be melted may be placed between the fabric strips in different forms. For example, it may be a plastic strip, a hot-melting yarn, or a powdery resin which glues the strips together when melting. The material may also be applied as a solution onto the surfaces to be joined together, in which case the material, when drying, forms a surface which melts by heating and glues the surfaces together.
The above melting methods can be used for joining two or more strips of fabric together. However, it is a disadvantage of these methods that it is necessary to use a separate melting layer of material in the seam, which makes the seaming more difficult. Another, maybe more important drawback is the thickness of the seam, because the seam portion always consists of two strips of fabric placed one upon the other. When the fabric seamed in this way is wound to form a roll, a thicker section is of course formed in the roll at the place of the seam, this thicker section being the thicker, as compared with the rest of the roll, the more fabric has been wound onto the roll. A thicker section on the roll makes its handling more difficult. Such a roll also has an ugly appearance, which is of importance for the competitive quality of the product.
If the material to be joined together is in itself thermoplastic, the seaming can of course be performed without a melting glue by partly melting the surfaces to be joined together, e.g. by means of a gas flame, and by pressing the surfaces together. This method also involves the same drawback as the earlier ones, because the seam section becomes thicker than the surrounding fabric.
Previously, attempts have been made to solve said problem so that the fabrics are melted together end edge against end edge (e.g. Swedish patent application 7401293-1), in wich case the seam portion does not become thicker than the rest of the fabric. A problem is in said method, however, created by the thickness of the fabric. In order that the seam made by means of said method should be durable, it ought to have an adequate surface area at the edges of the fabrics. This again requires a thick fabric. This method is not usable for thin fabrics, because in such a case a sufficient molted surface is not obtained to keep the seam together.
The object of the present invention is to provide a non-woven fabric joined together by seaming and eliminating the above drawbacks and wherein the seam portion produced by melt-seaming is not thicker than the other portions of the joined strips of fabric. This object is achieved by means of a non-woven fabric in accordance with the present invention, which is characterized in that the strips of fabric to be joined together are, at least at the edges to be joined together, provided with reinforcement yarns parallel to said edges and having a melting point higher than the melting point of the rest of the material of the fabric strips and that said edges to be joined together have by means of melting been shrunk into such a thickness that the thickness of the seam formed by said edges is substantially equal to the thickness of the strips of
REFERENCES:
patent: 4390384 (1983-06-01), Turner
Servo Matti
Vainio Matti
McCamish Marion
Tamfelt Oy AB
LandOfFree
Thermoplastic non-woven fabric seamed by melt-seaming and a meth does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermoplastic non-woven fabric seamed by melt-seaming and a meth, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermoplastic non-woven fabric seamed by melt-seaming and a meth will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-741809