Textiles: cloth finishing – Singeing
Patent
1985-05-29
1986-12-09
Mackey, Robert R.
Textiles: cloth finishing
Singeing
2395903, 239600, 431158, D06C 902
Patent
active
046271350
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a burner unit for the flame treatment of flat textile materials and, more particularly, to a burner unit for singeing machines, with a combustion chamber terminating in a singeing slot supplied from a gas mixture chamber by two parallel burner slots, and with the gas mixture chamber being encased by a burner element including two approximately U-shaped profile members clamped together along their longitudinal edges with an interposition of a mixture distributing rail respectively delimiting the burner slots along a longitudinal side.
A primary difficulty in the singeing of textile fabrics resides in effecting complete uniform singeing over an entire area of the fabric, because even minor spatial or temporal fluctuations during the singeing action can lead to undesirable patterns, such as, for example, spotting or streaking of the fabric. Regular singeing presupposes a flame that is extremely uniform over its length and stable against disturbing influences, the length of the singeing flame generally amounting to several meters. However, the singeing flame is very greatly dependent, inter alia, on the way in which the gas mixture is fed into the combustion chamber.
As compared with older burner designs with mixture feed via a single burner slot, a burner unit such as, for example, dislosed in German Pat. No. 2,023,782 has proven to be extraordinarily effective, under practical conditions, wherein two burner slots, arranged in parallel to each other, are provided, ensuring a temporally and locally extensively uniform feeding of the singeing flame. In the conventional burner unit, the outwardly disposed longitudinal sides of the two burner slots are in each case formed by the longitudinal sides of approximately U-shaped profile members surrounding a mixture distributing rail, these profile members encompassing the gas mixture chamber. During the machining of the longitudinal edges by milling, grinding, or the like, these edges, due to the shape and size of the profile, are perforce located at a relatively great distance from the clamping sites on the work table or the like, so that an elastic yielding in front of the machining tool cannot be avoided. Consequently, marked limits are set for the machining accuracy, i.e. certain dimensional tolerances and undulations in the surface and, therefore, certain spatial residual fluctuations in the singeing flame must be tolerated.
The aim underlying the present invention resides in providing a burner unit of the type discussed above wherein an especially high uniformity of the singeing flame is achieved in its longitudinal extension.
According to this invention, the mixture distributing rail is encased between two guide strips, respectively defining the other longitudinal side of the burner slots, these guide strips being clamped together with the mixture distributing rail as a package between the two U-shaped profile members. The invention offers the advantage that in this structure both sides of the burner slots are constituted by strips that can be machined with a substantially higher precision and uniformity. Consequently, a high surface quality of the burner slots and thus a clean flow of the gas mixture can be achieved. Any waviness in the longitudinal direction, still unavoidable in the manufacture of the U-shaped profile members, is now no longer effective directly on the contour of the burner slots; rather, such waviness is transmitted, at most, to a markedly reduced extent due to the interposed guide strips.
According to a preferred embodiment, the guide strips can exhibit a narrow bulge on their outer side, upstream of the burner slots, and they are clamped between the two U-shaped profile members at the site of this bulge. Consequently, the guide strips are in contact with the U-shaped profile members, in this arrangement, only along a narrowly limited area which furthermore is clearly distant from the zone of the burner slots. Irregularities on the longitudinal edges of the U-shaped profile memb
REFERENCES:
patent: 2675067 (1954-04-01), Hanson et al.
patent: 3721517 (1973-03-01), Osthoff
Melliand Textilberichte, 1982, issue 11, Nov. 9, 1982, Mellian Textilberichte KG, Heidelberg (DE), "Problematik des Sengens von Textilen Flachengebilden aus Polyester und Polyester-Mischungen", see pp. 794 to 797.
Mackey Robert R.
Osthoff Senge GmbH & Co. KG
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