Textiles: fiber preparation – Assembling – Web forming
Patent
1997-02-27
1998-11-24
Neas, Michael A.
Textiles: fiber preparation
Assembling
Web forming
19296, 19 99, D01G 2100
Patent
active
058391665
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention refers to a card for making an aerodynamically formed fibrous web.
Such cards are known, for example, from U.S. Pat. No. 3,256,569, U.S. Pat. No. 4,064,600, U.S. Pat. No. 4,097,965, U.S. Pat. No. 4,130,915 and DE 39 01 313 A.
In known cards, after an opening and carding process, the fibers are thrown off from a main cylinder into an airflow. This airflow transports the fibers to a screen means, e.g. a screen drum or a screen band, on which the formation of the web takes place and from which a fibrous web may be doffed continuously.
Starting from prior art as of DE 39 01 313 A, it is the object of the invention to provide a card which allows for a better uniformity of the fibrous web, in particular with lighter webs, while offering high production rates.
The object is solved, according to the invention, with the features of claims 1 and 8.
SUMMARY OF THE INVENTION
Advantageously, the invention provides to employ another cylinder rotating in opposite sense with respect to the main cylinder, which first receives fibers thrown off from the main cylinder and then throws them off into a shaft. This structure is of particular importance when using fiber mixtures with greatly different values with regard to the fineness, fiber density and fiber length. The second cylinder leads to an improved homogeneity and a better random orientation of the laid web. The main cylinder and the cylinder rotating in opposite sense thereto do not contact each other. Both radii of the fittings are also at a distance from each other. The method of the invention is particularly suitable for producing lighter fibrous webs at a very high production rate.
Preferably, the peripheral speed of the second cylinder is between approximately 80 and 110% of the peripheral speed of the main cylinder. Due to the almost equal peripheral speed of the second cylinder, a combing of the fibers is reliably prevented. The fibers are thrown from the main cylinder and laid on the second drum in random orientation. Without further combing operations, these fibers are transported into the shaft, again, by centrifugal forces, the shaft being flown through substantially by the peripheral air of the two drums rotating therewith.
The fiber feed means may at the same time form a preliminary fiber opening means. Thus, a preliminary opening of the fibers is obtained.
In a preferred embodiment it is provided that a carding section is provided between the fiber feed means and the main cylinder, comprising a plurality of successive carding rolls with working rolls. The carding section causes a particularly good opening of the fibers.
In the peripheral portion containing the fibers, the main cylinder is covered with trough covers or carding elements, so that the fibers leave the main cylinder at a defined location by centrifugal force.
The airflow forming in the shaft is substantially constituted by the entrained air of the main cylinder and of the second cylinder.
The following is a detailed description of embodiments of the invention, taken in conjunction with the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a first embodiment of the invention with an upstream carding section,
FIG. 2 shows a second embodiment with a cylinder at the beginning of the carding section, and
FIG. 3 shows a third embodiment without a carding section.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The card of FIG. 1 comprises a non-illustrated machine frame accommodating a carding section 28, a main cylinder 8, a second cylinder 20, as well as a shaft 10 beginning between the main cylinder 8 and the second cylinder 20.
The carding section 28 has five successively arranged carding rolls 31 to 35 to which five working rolls 36 to 40 are associated. The spinning material or the supply web is fed by the fiber feed means 6 comprising a feed roll with a feeding trough. At the end of the carding section 28, the web present on the last carding roll 35 is taken over by the main cylinder 8.
From carding roll to carding roll, in the dire
REFERENCES:
patent: 3256569 (1966-06-01), Draving
Neas Michael A.
Spinnbau GmbH
Worrel, Jr. Larry D.
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