Patent Application
20110047768
This invention relates generally to the bulk collection of texturized strand and, more particularly, to a method and apparatus for the bulk collection of texturized strand.
This invention relates to the bulk collection of strand, and in particular, to the bulk collection of texturized strand. A strand of glass filaments is typically formed by attenuating molten glass through a plurality of orifices in a bottom plate of a bushing. The filaments are attenuated by applying tensile forces to the streams of glass, so as to attenuate the streams. The filaments are coated with a sizing or binder material. The composition of the sizing material is tailored to the end use of the filaments. For example, if the filaments are to be used to reinforce an epoxy based composite then the sizing is formulated to be compatible with the particular epoxy. In this particular application, the sizing is tailored to provide the required lubricity, abrasion resistance, and integrity to the strand as it is processed in texturizing equipment while at the same time allowing for easy texturization of the strand in the texturization unit. The glass filaments are sized with the sizing material substantially immediately after they are formed. The filaments are gathered in parallel relationship to form a strand.
In conventional filament forming systems, the streams of glass have been attenuated by winding the filaments on an exterior of a rotating tube. The strand of filaments is wound on the tube as a cylindrical package. The winding device with the rotating tube pulls the filaments and collects the strand.
Instead of winding the strand around a rotating tube, the strand may be gathered into a container. The strand is typically collected in a container when it is attenuated by a pulling device such as mating wheels or a pair of belts. A bulk collection of strand can be easily shipped and used in subsequent processes.
Texturized strand is continuous strand that has been expanded or texturized. The fibers in the strand are separated to give the strand a full, wool-like appearance. Texturized strand dissipates air borne acoustic waves and also possesses good thermal insulative properties. Texturized strand is typically used in sound absorbers.
As the texturized strand is delivered into the box, excess air from the texturizing process tends to blow the strand around in the box during the filing process. This produces the conditions that result in tangles as the texturized strand is being pulled out of the box for subsequent processing.
Attempts have been made in the past to limit or eliminate the tangling problem. One such attempt is disclosed in U.S. Pat. No. 6,370,747 to Lewin et al. This patent discloses a method wherein texturized strand is directed into a four sided box with both the top and bottom of the box open. More specifically, the box is filled by directing the texturized strand down into the box though the open top. The bottom of the box opens into a screen covering a low air pressure chamber. The open bottom of the box allows the air to escape from the box quickly thereby significantly reducing the billowing of the strand in the box and, therefore, the formation of tangles when the strand is subsequently pulled from the box for processing.
Unfortunately, as the texturized strand or roving collects on the screen, the airflow resistance through the deposited strands increases. This results in less and less of the air being removed from the box by the low pressure chamber below the screen. Once the texturized strand or woven thickness on the screen exceeds about 10 to 15 centimeters (the thickness depends upon the pressure in the low pressure chamber), the amount of air removed from the box becomes so small that the strand is blown around in the box producing conditions that are known to cause strand tangling.
The current invention relates to a new and improved method and apparatus for eliminating the conditions that tend to cause the tangling of a texturized strand as it is removed from a box or container for further processing,
In accordance with the purposes of the present invention as described herein, an improved method is provided for collecting a strand using an air stream dissipater. The method comprises: (a) texturizing the strand with an air stream on a first side of the air stream dissipater; (b) directing the texturized strand through the air stream dissipater; and (c) collecting the texturized strand in a container on a second side of the air stream dissipater. Advantageously, the air stream dissipater redirects excess air from the texturizing process away from the container thereby reducing the billowing and shifting of the strand in the container that result in tangles in the texturized strand when the texturized strand is subsequently pulled from the container.
In one possible embodiment, the directing step includes directing the texturized strand through an aperture in an air stream deflector. In another possible embodiment, the directing step includes directing the texturized strand through a perforated pipe. In yet another possible embodiment, the directing step includes directing the texturized strand through an aperture in an air stream deflector and a lumen of a perforated pipe.
In accordance with yet another aspect of the present invention, a system is provided for texturizing a strand. The system comprises: (a) a texturizer for texturizing a strand with an air stream; (b) a container to collect and hold the texturized strand; and (c) an air stream dissipater provided between the texturizer and the container to dissipate excess air from the air stream and prevent that excess air from entering the container.
In one possible embodiment, the dissipater is an air stream deflector including an aperture through which the texturized strand passes. The aperture may have a diameter of between about 2 and about 10 cm. The air stream deflector may extend at least 5 cm beyond an edge of the aperture.
In another possible embodiment, the dissipater comprises a pipe having a lumen through which the texturized strand passes. That lumen may have a diameter of between about 2 and about 12 cm. Further, the side wall of the pipe may be perforated to include between about 1 and about 90% open space to allow the dissipation of excess air as the texurized strand is directed into the container.
In still another possible embodiment, the dissipater comprises both the air stream deflector and the perforated pipe. The pipe may be pivotally mounted to the air stream deflector to permit the pipe to move in a first direction, and the air stream deflector may also be pivotally mounted to permit the pipe to move in a second direction, thereby allowing the pipe to move in an x-y pattern thereby promoting ordered layering of texturized strand in a box or container.
In accordance with yet another aspect of the present invention, a dissipater is provided. The dissipater comprises an air stream deflector including an aperture and a perforated pipe having a lumen in communication with that aperture.
In the following description there is shown and described several different embodiments of the invention, simply by way of illustration of some of the modes best suited to carry out the invention. As it will be realized, the invention is capable of other different embodiments and its several details are capable of modification in various, obvious aspects all without departing from the invention. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
The accompanying drawings incorporated herein and forming a part of the specification, illustrate several aspects of the present invention and together with the description serve to explain certain principles of the invention. In the drawings:
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. All references cited herein, including published or corresponding U.S. or foreign patent applications, issued U.S. or foreign patents, or any other references, are each incorporated by reference in their entireties, including all data, tables, figures, and text presented in the cited references. In the drawings, the thickness of the lines, layers, and regions may be exaggerated for clarity. It is to be noted that like numbers found throughout the figures denote like elements.
Reference is now made to
As best illustrated in
The texturized strand 24 is next directed through a dissipater, generally designated by reference numeral 26, before being delivered into a box or container 28 where it is held for delivery to a customer. Typically, the dissipater 26 or a portion of the dissipater such as the pipe 36, or the box/container 28 is moved in an x-y pattern to promote ordered layering of the texturized strand 24 in the box/container. Of course, it should be appreciated that other appropriate movement patterns could be used.
In the embodiment illustrated in
Typically, the dissipater 26 is positioned between about 1 and about 40 cm from the texturizer 14 and, more particularly, the end of the nozzle 22. Typically the aperture 34 has a diameter of between about 2 and about 12 cm. Further, the air stream deflector 30 and, more particularly, the planar body 32, extends at least 5 cm and typically between about 10 and about 35 cm beyond the peripheral edge or margin of the aperture 34.
Typically the lumen 38 of the pipe 36 has a diameter of between about 2 and about 12 cm. Further, the side wall 40 of the pipe includes between about 1 and about 90% and more typically between about 15 and about 40% open space. In the illustrated embodiment, the apertures or perforations 42 in the side wall 40 are circular in shape. It should be appreciated, however, that those apertures may assume substantially any other shape that does not interfere with the passage of the texturized strand 24 through the perforated pipe 36 but allows excess air from the texturizing process to escape and dissipate outwardly away from the open container 28.
The method of the present invention of collecting a texturized strand 24 comprises the steps of (a) texturizing the strand 12 with an air stream on a first side of the air stream dissipater 26; (b) directing the texturized strand 24 through the air stream dissipater; and (c) collecting the texturized strand 24 in a container 28 on a second side of the air stream dissipater. As should be appreciated the air stream dissipater 26 and, more particularly, an air stream deflector 30 redirects excess air from the texturizing process away from the container 28 (see action arrows A in
In the illustrated embodiment of
As noted above, a portion of the dissipater 26, such as the pipe 36, may be moved in an x-y pattern to promote ordered layering of the texturized strand 24 in the box/container. As shown in
As shown in
Pivotally mounting both pipe 36 and air stream deflector 30, permits pipe 36 to move in an x-y pattern. Pipe 36 may be moved manually. Alternatively, pipe 36 may be moved using an automated positioning system 60.
As shown in
Each actuator 62, 64 may be fitted with an associated proximity switch 66, 68, which reverses the motion of the associated actuator at a predetermined distance, thereby directing pipe 36 in a zig-zag motion in the x-y plane.
The foregoing description of the preferred embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Obvious modifications or variations are possible in light of the above teachings. The embodiments were chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. In some embodiments of the invention, certain features of the invention may be used to advantage without a corresponding use of other features. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally and equitably entitled. The drawings and preferred embodiments do not and are not intended to limit the ordinary meaning of the claims in their fair and broad interpretation in any way.
