ANTISTATIC TRANSFER BELT FOR NONWOVENS PROCESS |
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申请号 | EP05788646.7 | 申请日 | 2005-08-18 | 公开(公告)号 | EP1803337B1 | 公开(公告)日 | 2015-10-07 |
申请人 | ALBANY INTERNATIONAL CORP.; | 发明人 | SENELLART, Jean; DEBYSER, Pascal; | ||||
摘要 | |||||||
权利要求 | |||||||
说明书全文 | The present invention is directed towards the production of nonwovens and concerns associated therewith, in particular, air flow and static electricity. There presently exists apparatus for the production of nonwovens for example, spun-bond webs, structures or articles formed from filaments or fibers typically made from a thermoplastic resin. Such an apparatus is disclosed in U.S. Patent No. Apparatus of the type aforementioned, particularly for high-speed melt-bond web production are currently available from Reifenhäuser GmbH Co. Maschinenfabrik, Spicher Strabe D-53839 Troisdort, Germany and sold under the name Reicofil®. The latest generation of such high-speed spun-bond lines is referred to as the Reicofil® 3 type system. Another manufacturer of such equipment is Nordson Corporation, 28601 Clemens Road, Westlake, Ohio 44145. Other manufacturers are STP Impianti, Rieter Perfojet, Kobelco, Ason and NWT. An airlaid process may also be used to form a non-woven web. The airlaid process begins with a defibration system to open fluff pulp. A conventional fiberizer or other shredding device may also be used to form discrete fibers. Particles of absorbent materials (for example super absorbent powder), abrasives or other materials may then be mixed with the fibers. The mixture is then suspended in an air stream within a forming system and deposited to a moving forming wire, screen or rotating perforated cylinder. The randomly oriented airformed fiber may then be bonded by applying a latex binder and drying, thermally bonding thermoplastic staple fibers in the web, hydrogen or embossed bonding or a combination thereof. In addition, the nonwoven web may be optionally compacted before the bonding step noted above. Compaction is typically performed on the forming wire before bonding. During compaction, the absorbents, abrasives or other materials, which are mixed with the fiber, damage the forming wire. A felt may be used on this position during the compaction step to prevent damage to the forming wire. The compressibility of the felt allows the nonwoven web to compact without damaging the felt or the wire. There are a number of commercial processes available to produce airlaid nonwoven webs. For example, airlaid processes are available from Dan-Web Corp. having offices in Risskov, Denmark, and from M&J Forming Technologies having offices in Horsens, Denmark. The present invention relates to producing nonwovens and the concerns associated therewith, in particular, static electricity. In a nonwovens process, there is a large amount of static electricity generated. The present invention relates to addressing this problem. Normally a negative charge builds up on the filaments or fibers as they are being processed. Successive layers of fibers, since they are the same polarity, tend to repel each other. Charged fibers tend to cling to the press rolls. They also tend to be repelled from the forming fabric, since it will develop a charge thereon during the processing of the charged fibers. This charge tends to accumulate. In European Patent Application No. The present invention concerns dissipating static electric charge whilst maintaining air permeability of a transfer belt. Heretofore, None of the prior art however provides for an antistatic transfer belt for use in the production of nonwovens having a woven or spiral formed base to which a conductive batt, foam or other material is added whilst maintaining a desired air permeability. XP 002359370 discloses technical filtration fabrics. It is therefore a principal object of the invention to provide a transfer belt for the production of non-woven webs, structures or articles, which dissipates static electric charge. It is a further object of the invention that an adequate air permeability of the antistatic transfer belt is maintained. These and other objects and advantages are achieved by an industrial antistatic transfer belt according to claim 1. Further features of the invention are defined by dependent claims 2-14. Thus by the present invention, its objects and advantages will be realized, the description of which should be taken in conjunction with the drawings wherein:
Turning now more particularly to the figures where like elements will be similarly numbered, Advantageously, the present invention is a transfer belt for use in a nonwovens process which dissipates the static electric charge, whilst maintaining the desired air permeability. In this regard, shown in The base substrate may be any one of the structures used as bases for paper machine clothing, such as, for example, a woven or a spiral-link fabric. The base substrate may also be assembled from a strip of one of woven materials spirally wound in a plurality of turns, each turn being joined to those adjacent thereto by a continuous seam which is disclosed in commonly assigned The base substrate may also be a laminated structure comprising two or more base substrates, each of which may be one of the structures described above. Where the base substrate is laminated, one of the component base substrates may be an on-machine-seamable fabric, so that the belt may be seamed into endless form during installation on a paper machine., The base substrate may be woven, or otherwise assembled, from yarns of any of the varieties used in the manufacture of paper machine clothing and industrial process fabrics. That is to say, the base substrate may include monofilament, plied monofilament, multifilament, plied multifilament or yarns spun from staple fibers of any of the synthetic polymeric resins used by those skilled in the art. In the example shown in In addition, the conductive material 22 may be coating on base substrate or structure 20. The coated conductive material 22 may be applied to the base substrate or structure 20 by spraying, extruding, or being a layer of thermofusible material. As a further advantage, the web-facing surface of the batt, foam or other material 22 is smooth in order to avoid plugging and marking problems associated with certain nonwovens production utilizing a large amount of what is commonly referred to as Super Absorbent Powder or SAP. For example, the surface of a coated conductive material 22 may be made to obtain the desired surface topography or smoothness by compacting or sanding. Accordingly, the antistatic transfer belt 18 of the present invention is a multi-layer structure which may contain one or more bases 20 and one or more layers of batt, foam or other material 22, a portion of which is conductive. Such a transfer belt 18 reduces static electric charge during nonwovens production whilst providing a desired air permeability in the web production process. Although a preferred embodiment has been disclosed and described in detail herein, its scope should not be limited thereby; rather its scope should be determined by that of the appended claims. |