Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1999-04-10
2000-04-04
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156293, 1563082, 300 21, B32B 3128
Patent
active
060456493
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for the manufacture of brushware, particularly brushes.
In the manufacture of brushware, particularly brushes, paint brushes, mats, pads, floor coverings, etc., it is necessary to connect in one piece to a bristle carrier a plurality of single bristles or bristle bundles. The prior art discloses various methods for this purpose, but all suffer from certain disadvantages.
Since the first use of plastics both for bristles and for the bristle carrier, numerous attempts have been made to replace the earlier mechanical fastening of the bristles or bristle bundles to the bristle carrier by a positive or integral connection without any other mechanical fastening means. An important quality feature for brushware is the extraction or pull-out resistance of the individual bristles or bristle bundles, i.e. the bristles must be embedded in the plastic mass of the bristle carrier in such a way that they are not released or detached under the forces occurring during use. Of the known methods, only those have proved to be usable in which a thickened portion is provided on the bundle ends and which following the introduction into the plastic mass of the bristle carrier forms a type of anchor and also interconnects the bristles at their fastening-side end, so that the extraction forces acting on the bundle or also only on the individual bristles is introduced into the thickened portion and absorbed by the fixture thereof in the bristle carrier.
It is known from DE 36 37 750 A1 to form in the bristle carrier blind holes and to heat the plastics material surrounding the blind holes until it becomes flowable. Subsequently a unwelded or welded bristle bundle with the anchoring end is pressed into the melted blind hole, so that the bristles are held in the bristle carrier. However, it is frequently additionally necessary to have a mechanical sealing or compression of the melt in the vicinity of the hole rim. However, the particular disadvantage of this method is that the necessary heating of the bristle carrier material must take place into the thermoplastic range with very precisely chosen, relatively low heating temperatures. As a result of the slow heating, this method leads to relatively long cycle times, which is uneconomic. In the case of one-sided heating of the bristle carrier, there is a danger of the latter distorting. It is also very difficult to introduce in planned manner thermal energy into a plurality of closely adjacent blind holes, because especially with very small brushes there is a risk of the blind holes collapsing on heating. On feeding individual bristles into the blind holes, the problem arises that the low flexural strength of the single bristles is further significantly reduced when they are heated, so that during feeding there can be a lateral moving aside of the bristles.
It is also known to weld the bristles to the bristle carrier. For this purpose the bristles or bristle bundles and the bristle carrier, which are made from the same material, are heated to a thermoplastic state and then the two components are pressed onto one another. Due to the strong heating of the bristles, there is a molecular reorientation of the bristle material and consequently a marked deterioration of the flexural strength of the individual bristles, together with a reduction of their tensile strength. In a variant of the method, at the end of the bristles or bristle bundle can be formed slightly thickened heads. As the two components are only connected via the materials flowing together at the connection points, there is not always an adequate connection between the two components. In addition, this method also leads to relatively long cycle times. During the welding of the bristles or bristle bundles, weld feet form on the bristle carrier, so that the latter has a stepped surface, in which can collect bacteria or other impurities. This makes it much more difficult to clean the brush and is also extremely unhygienic.
It is particularly difficult to fasten singl
REFERENCES:
patent: 3560291 (1971-02-01), Foglia et al.
patent: 5893959 (1999-04-01), Muellich
Potente, H : Entwlcklungstendenben beim Laser-Schweissen von Kunststoffen, Plastverbieter 46, 1995, Nr. 10, pp. 58, 59, 62, 64.
Patent Abstracts of Japan, Publication No. 01277506, vol. 14, No. 43, Jan. 1990.
Patent Abstracts of Japan, Publication No. 03023807, vol. 15, No. 141, Apr. 1991.
Ball Michael W.
Coronet-Werke GmbH
Tolin Michael A
Vincent Paul
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