Textiles: fiber preparation – Working – Carding
Reexamination Certificate
1999-03-26
2001-05-01
Calvert, John J. (Department: 3765)
Textiles: fiber preparation
Working
Carding
C019S112000, C019S161100, C019S299000
Reexamination Certificate
active
06223398
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application claims the priority of German Application No. 198 13 341.3 filed Mar. 26, 1998, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to a heating device for a fiber processing machine such as a carding machine or a roller card unit which produces a fiber web. At the output of the fiber processing machine calender rolls are provided for mechanically compressing (densifying) the web and further, a device is provided for binding the fibers to one another by heat.
The production of webs by roller card units or carding machines has always been of significant commercial importance which grew even further, particularly with the frequent use of natural fibers which require the roller card technology in case of thin webs. For strengthening the web, particularly in case of thin webs, a mixture of binding fibers with other chemical fibers or natural fibers has been processed, followed by a subsequent processing step in which the web, produced by the roller card, has been strengthened, for example, in a calender with heated rolls. The high degree of flexibility of the roller card process is a significant operational advantage. To increase the output of the machines it is a desideratum, on the one hand, to increase the operating width of the machines and, on the other hand, the output speed of the web. Since in case of width increase the costs for the machine and the feeder increase disproportionately to the widening, the latter has to be maintained within certain limits for economical reasons. Consequently, the development has been strongly concentrating on the increase of the output speed. Such increase, however, can occur in case of given web thicknesses only by increasing the web discharge delivery speeds. For this purpose, significant untapped possibilities may be found in the preparatory machines, roller card feeders and the roller cards themselves. Thus, a roller card is capable of producing fast-running thin webs and transferring them at high delivery speeds to the doffer. A drawback of this arrangement involves the subsequent guidance of the rapidly travelling webs downstream of the roller card to a successive processing machine, such as a thermobonding calender. To overcome these difficulties, the use of various additional devices has been suggested. According to one proposal, perforated belts have been provided which are placed under vacuum and advance the webs to the subsequent processing machine to ensure that the friction between the rapidly moved web and the surrounding air does not cause disturbances in the web. In such a solution, an exact coordination between the speed and strength of the vacuum in case of different web qualities and weights has been found to involve substantial difficulties. More particular and partially insurmountable difficulties, however, are encountered at the transfer locations between the delivery rolls of the roller card, the perforated belt and the feeding device in the calender, especially in case of high delivery speeds of 300 m/min and higher. These difficulties set technological limits which render significantly more difficult the starting, the normal operation and the stoppage which eventually lead to the result that only certain speeds can be set because above such speeds continuous disturbances are encountered. Lower output speeds, however, are uneconomical.
According to a known device, as disclosed in German Offenlegungsschrift (application published without examination) 36 17 862, a roller card unit is provided from which the web is introduced by means of conveying devices into a cross laying device and therefrom the web is further conveyed by additional advancing devices to a thermocalender in which the thermostrengthening is effected. The calender rolls have a low circumferential speed corresponding to the low delivery speed of the web. The transfers and directional changes of the web require a low speed to ensure that the web is not destroyed. It is a disadvantage of this arrangement that the production output is lowered.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved device of the above-outlined type from which the discussed disadvantages are eliminated and which, while preserving a superior degree of flexibility and quality, permits a high operating speed and a high output rate.
This object and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the textile fiber processing machine includes a device for forming a fiber web from a fiber lap; a device for advancing the fiber web to a web outputting device for discharging the web thereby in a direction of advance; and two cooperating calender rolls defining a nip receiving the web discharged by the web outputting device. The calender rolls are situated immediately adjacent the web outputting device downstream thereof as viewed in the direction of web advance. Further, a heating arrangement is provided for heating at least one of the calender rolls for thermo-bonding the web as it passes through the nip of the calender rolls.
A significant increase of the delivery speed is achieved by virtue of the fact that the thermobonding rolls are arranged in the immediate vicinity of the web output in the roller card unit so that the web runs by itself into the nip of the thermobonding roll pair. The web, after it leaves the thermobonding rolls, is strengthened such that it may have high transporting speeds or winding speeds without damaging or destroying the web. The measures according to the invention provide in a simple manner an early strengthening of the web so that it may be further processed while maintaining high working speeds. This results in a high output and, because of the significantly reduced disturbing effects and danger of tear, it also results in a higher quality of the product.
The invention has the following additional advantageous features:
A preheating device provides that the web runs preheated into the nip of the calender rolls.
The temperature of at least one of the calender rolls and/or the preheating device is adjustable.
A cooling roll is arranged downstream of the heatable calender roll.
The bending of the calender rolls is controlled.
Floating rolls are used as calender rolls.
The web loops around the calender rolls to provide for a greater heat transfer region of the roll surface.
A web guide element is provided underneath one of the rolls of the web delivering device.
At least one of the calender rolls is loaded, for example, by a spring, a weight or by a pneumatic or hydraulic device.
The web delivering device is a withdrawing device such as a stripping roll.
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paten
Calvert John J.
Kelemen Gabor J.
Trutzschler GmbH & Co. KG
Venable
Welch Gary L.
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