Bleaching and dyeing; fluid treatment and chemical modification – Chemical modification of textiles or fibers or products thereof – Treating textiles or fibers from synthetic resin or natural...
Patent
1992-09-02
1994-10-11
Richter, Johann
Bleaching and dyeing; fluid treatment and chemical modification
Chemical modification of textiles or fibers or products thereof
Treating textiles or fibers from synthetic resin or natural...
8930, 252 86, 252 89, 428260, C08K 506
Patent
active
053543394
DESCRIPTION:
BRIEF SUMMARY
The present invention relates particularly, although by no means exclusively to enhancing the properties of materials so as to make them more suitable for needlework in domestic and small scale applications, and more particularly in relation to embroidering.
To date the main difficulty experienced in performing general sewing, and addressed by this invention, relates to the uneven finish due to the stretch of the fabrics. As the sewing machine transports the fabric, the loose nature of usual weaving patterns and fabrics used makes it likely that the fabric will not always move in step with the sewing machine's transport movement. Fabric stretch being the reason for this erratic behaviour.
To embroider patterns on a material various aids have been used. In one system of the prior art the material is stretched between two hoops before embroidering a pattern within the area of the hoops. By moving the hoops along the length of the material the whole pattern is thus completed. In utilising this technique it is essential that the material is evenly stretched. Although the hoop system tends to work well with stiff materials, real problems are experienced with fine and stretchy materials. This is because of the difficulty experienced in maintaining an even tension over the whole pattern. Where one tension is not maintained the finished product will exhibit unsightly ripples. A further drawback in the utilization of this technique is that the user is unable to make use of the hoops for working on a pattern along the edges of a material.
It can thus be seen that this system is quite restrictive, applying only to stiff materials and to work where the patterns are located well away from the edges of the material.
In another system of the prior art the material to be embroidered is prepared by laminating it with a sheet of stiff material. Although the problems associated with fine and stretchy materials are alleviated by the use of a stiff backing this excludes its use in embroidering on fine garments where delicate appearance is essential.
To overcome this shortcoming, it is known in the prior art to laminate a backing material which is paper based, e.g. waxed paper, wherein the backing material is removed after the embroidery is completed. Once again this system includes drawbacks in that the removal of the backing material is difficult to achieve without damage to the material itself. Furthermore, the finished product often contains unsightly fragments of the backing layer and rippling of the fabric still occurs since the fabric can still move relative to the paper.
In another system it has been proposed to use starch to stiffen materials. However, because of the different characteristics of the starch, to achieve the same degree of stiffness, one is required to use substantial amounts of starch to achieve an equivalent product. This results in a brittle and flaky product. Thus whenever the starch treated material is manipulated it rapidly loses its stiffness since the starch readily breaks up. The heavily starched materials thus have a tendency to shed starch flakes which eventually interfere with the machine mechanism. Another drawback in using starch to prepare fabrics caused by its physical characteristics (that is, hard and brittle), results in the needle cutting the fibres and thus weakening the material as well as presenting an unsightly appearance. This is because the material treated with starch does not permit the needle in penetration of the material to push aside the adjacent fibres.
In light of the foregoing problems and the disadvantages presented by the above prior art systems, it is an object of this invention to provide enhanced properties to difficult materials so as to enable easy needlework application. This is achieved by dealing with the direct cause rather than trying to compensate for it. Logical solution is in preventing the stretch of the fabrics during sewing operations.
The present invention relates to a method of preparation of materials for needlework by their impregnation with a water
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Kilby Scalzo Catherine S.
Richter Johann
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