Textiles: spinning – twisting – and twining – Apparatus and processes – With other type crimping or texturing
Reexamination Certificate
1998-12-21
2001-02-27
Vanatta, Amy B. (Department: 3741)
Textiles: spinning, twisting, and twining
Apparatus and processes
With other type crimping or texturing
C057S333000, C028S220000, C028S271000
Reexamination Certificate
active
06192667
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention concerns the guidance of bundles of fibrils through a part of a spin draw texturizing machine or a draw texturizing machine comprising of a texturizing unit disposed downstream from a pair of draw rolls. The texturized unit has individual texturizing nozzles incorporating a transportation portion and a texturizing portion in which the bundles of fibrils are texturized.
In a texturizing method from the European patent application EP 0 784 109 A1, a plurality of individual bundles of fibrils simultaneously are drawn on a pair of draw rolls and subsequently are texturized in a texturizing unit with a plurality of texturizing nozzles arranged side by side. In this method, it is found that the individual bundles of fibrils are guided on the pair of draw rolls spaced by smaller mutual distances than the distances required from one texturizing nozzle to the next.
As on the other hand, the design height of the machine is to be kept as low as possible in order to permit stringing up of the filament bundles. These filament bundles are sucked in at high speed by means of a so-called suction gun and transported as quickly as possible from one end of the machine to the other end. For this purpose, the distances between the individual operating units are to be kept as small as possible.
These requirements concerning the spacing distances prove particularly disadvantageous in guiding the bundles of fibrils between the supplying draw roll and the texturizing unit. As mentioned, the spacing distance from one bundle of fibrils to the next is to be kept as small as possible, whereas the distance from one texturizing nozzle to the next for various reasons, e.g. concerning lay-out dimensions, must be substantially larger. Thus, the bundles of fibrils must fan out considerably from the draw roll and must be deflected upstream from, or directly at, the inlet into each individual texturizing nozzle.
In this arrangement, the smaller spacing distance from one bundle of fibrils to the next within a group of bundles differs from the somewhat larger distance from one group to the next.
In order to maintain the group distance between the last group, second to last group, and outermost group, in spite of the fanning out of the bundles, guide elements must be provided between the individual draw rolls of a pair of draw rolls. These guide elements guide the last group of bundles of fibrils on the draw roll distanced far enough from the second to last group of bundles of fibrils that, in spite of the delivery width of the last bundles of fibrils from the roll to the texturizing unit, the distance between groups can be provided acceptably large enough that neither rolls of excessive length are required. Also, the danger does not arise that the fanned-out bundles of fibrils of the last group overlap the bundles of fibrils of the preceding group still located on the roll.
The above mentioned guide elements, be it deflecting elements arranged between the rolls or deflecting elements arranged upstream from the inlet of each individual texturizing nozzle, present the disadvantage that they inherently generate a uncontrollable extent of damage to the individual bundle of fibrils, e.g. deformations to the fibril cross-section. The extent of damage is uncontrolled in so far as the deflection, particularly the deflections upstream from the inlet to each individual texturizing nozzle, differs from one texturizing nozzle to the next. These deflections happen in such a manner that differences in the texturizing effect can be generated, which possibly will be visible in the finished product, e.g. in a carpet.
Furthermore, it is known from the Swiss patent application CH 680 140A5 that texturizing nozzles are laid out at their inlet portion. The texturizing and transporting air for taking over the bundle of fibrils is injected into these texturizing nozzles in such a manner that the air injected imparts a twist to the bundle of fibrils. This twist is propagated against the direction of transport of the bundle of fibrils up to a twist stop and is called a false twist. A false twist of this type is generated in order to impart compactness to the bundle of fibrils in such a manner that individual fibrils sticking out are better tied into the bundle in order to obtain an evening effect in the bundle of fibrils.
It has been found, however, that in case the bundles of fibrils are transferred from a draw roll directly into the inlet of the texturizing nozzle, the false twist mentioned above tends to move the individual bundles of fibrils on the roll surface corresponding to the twist direction in the axial direction of the roll. This movement happens in such a manner that a certain migration of the bundles of fibrils in axial direction occurs up to the zone of the roll surface. Owing to the tensile force in the thread on the roll surface, a contacting pressure is generated, which presses the bundles of fibrils against the roll surface in such a manner that a twist stop is formed.
If now, as mentioned already, the bundles of fibrils must be guided in a fan-type arrangement from the roll towards the individual texturizing nozzles, the twist has different effects depending on the angle position of the respective bundle of fibrils in the fan type arrangement. For example, a certain position of a bundle of fibrils can counteract the migration along the envelope line of the roll, whereas another position assists this migration further resulting in a jittery movement of the respective bundle of fibrils.
The disadvantages of the arrangement mentioned above consist in that due to the different compacting action exerted onto the individual bundles of fibrils by the twist or by the jittery movement, respectively, an uneven texturizing effect varying from one bundle of fibrils to the next may be generated. The uneven texturizing results, as mentioned before, are visible and disadvantageous differences in the finished product, e.g. in a carpet.
OBJECTS AND SUMMARY OF THE INVENTION
It thus is a principal object of the present invention to create a device to eliminate the uneven texturizing effect on different bundles of fibrils which cause visible and disadvantageous differences in finished products.
Additional objects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the invention.
Once preferred embodiment of the present invention comprises a guidance of bundles of fibrils through a part of a spin draw texturizing machine or draw texturizing machine comprising a texturizing unit arranged downstream from a pair of draw rolls with individual texturizing nozzles each with a transporting portion and a texturizing portion in which individual bundles of fibrils are texturized. The guidance of bundles of fibrils are characterized in that the bundles of fibrils each between a roll of the pair of draw rolls, from which the bundles of fibrils are delivered to the texturizing unit, and the individual texturizing nozzles are subject to a predetermined false twist directed in such a manner that the twist induces the corresponding bundle of fibrils to roll on the roll surface in the direction in which the thread tension between the roll and the corresponding texturizing nozzles increases.
In the sense of an example merely, the present invention is explained in the following with reference to illustrated design examples. It is shown in the:
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Dority & Manning
Maschinenfabrick Rieter AG
Vanatta Amy B.
LandOfFree
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