The field of the invention relates to process belts and more specifically, to process belts used in manufacturing processes, e.g., the manufacture of pressed board or other paper products.
Generally, process belts are used in the preparation of pulp or materials in sheet or non-woven fabric, such as paper or board, in the Paper or Board Making Industry. Such process belts are typically woven wire fabric formed into continuous or endless belts by brazing or welding. For example, end sections of such process belts are generally brazed or welded together to form a brazed or welded seam between the end sections of the process belt, thereby introducing a local stiffness at the seam.
However, brazing or welding typically degrades the strength and malleability of the wires adjacent the brazed or welded seam due to elevated temperatures. The degradation can result in premature failure of such process belts at or near the brazed or welded seam, which generally requires the process belt to be removed, repaired and reinstalled on the paper process machine or to be replaced with a new process belt.
The accompanying drawings, which are incorporated in and constitute a part of the specification, of embodiments of the invention, together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention wherein:
The individual filaments 20, 22 can be woven together, for example, using a weaving machine, or may be weaved manually, to form the body portion 12. Alternatively, a single beam loom or a double beam loom can be used depending on the type of weave pattern chosen for the belt 10. In the particular weave pattern of the seam 17 shown in
A first plurality of looped segments 26 can be attached to the first end section 14 of the process belt 10, for example, by weaving, bonding or welding. For example, each looped segment 26 can include a first end 28, a second end 30 (
Similarly, a second plurality of looped segments 34 are attached to the second end section 16 of the process belt 10, for example, by weaving or bonding such as welding or fusing. For example, each looped segment 34 can include a first end 36, a second end 38 (
During manual weaving of the looped segments 26, 34, the looped segments 26, 34 may be distinguished from one another with markings, such as being painted different colors, for example. The distinguishing markings can help ensure that a sufficient number of looped segments 26 and 34 are attached to respective end portions 14, 16 of the belt 10.
To effect weaving of the looped segments 26, 34 into respective end sections 14, 16 of the belt 10, holes may need to be formed in the existing belt 10. Such holes, which may be formed with a drill, an awl, a plasma arc cutter or other tool capable of forming a hole in the belt 10, can allow ends 28, 30 or ends 34, 36 of the respective looped segment 26, 34 to be woven into the belt 10, as described above, about the horizontally extending filaments 22. Such holes may also be formed by displacing the filaments 20, 22 to create a space with no need to drill or cut the belt 10 in any manner.
Alternatively, in another embodiment, one or both of the first and second ends 28, 30 of the looped segment 26 can be bonded, for example, by welding or fusing, to either the vertically extending filaments 20 or the horizontally extending filaments 22. Also, the first end 28 can be bonded or fused to the second end 30 after the looped portion 32 has been formed. The first and second ends 34, 36 of the looped segment 32 can also be bonded or fused to the vertically extending filaments 20, to the horizontally extending filaments 22 or to one another.
Each individual vertically extending filament 20, each horizontally extending filament 22 and the at least one elongated resilient coupling filament 24 can be made from carbon steel, stainless steel or other sufficiently hardened material, for example, into solid filaments as shown in
Each filament 20, 22 and 24 can be coated, for example, to reduce corrosion and/or abrasion, through a coating process. The coating may be a low friction and contaminant resistant protective coating, for example, and may include brass or some other hardening (corrosion and abrasion resistant) material. The low friction and contaminant resistant protective coating can be applied by conventional coating techniques, such as dipping or continuously running the filaments through a bath. Alternatively, a batch dipping can be used.
The looped segments 26, 34 can be made from a sufficiently flexible material, such as soft stainless steel, or plasticized material, e.g., a plastic, a synthetic, a thermoplastic or a polymer. Other flexible materials can also be used, such as metal wire, sewing wires, cables wire or high tensile wires. The sufficiently flexible material can be more flexible and softer than the hardened material used to form the filaments 20, 22, 24. The sufficiently flexible material allows for formation of the looped sections 32, 40 described above and may determine whether respective ends of the looped segments 26, 32 are weaved, bonded or fused to the belt 10 or bonded or fused to one another.
Alternatively, as shown in
Adjacent body portions 12 can be operatively connected to one another by the seam 117 to form a continuous belt 110. The seam 117 is substantially similar in configuration and operation as the seam 17, and includes the looped segments 26, 32. Because the edge portions 123, 125 do not operatively connect adjacent body portions 12 together at the same plane as the middle portion 121, the seam 117 can be referred to as castellated.
In this embodiment, one or more (e.g., three) coupling filaments 24 can be provided to cooperate with the looped segments 26, 32 to one another. For example, the middle portion 121 of one body portion 12 can be operatively connected to a corresponding middle portion of another body portion 12 and each edge portion 123, 125 of the one body portion 12 can be operatively connected to corresponding edge portions 123, 125 of the other body portion 12. In this regard, the middle portion 121 and edge portions 123, 125 of one body portion 12 substantially act as a first end section 14 and the middle portion 121 and edge portions 123, 125 of an adjacent body portion 12 substantially act as a second end section 16.
The middle portion 121 or the edge portions 123, 125 can include equal or different numbers of individual filaments 20, 22 of equal or different diameters. Each edge portion 123, 125 may extend about 4-8 inches in width in the cross machine direction of the belt 110 and about 6-18 inches in length in the machine direction of the belt 110. Other numbers of filaments and configurations are possible for each portion 121, 123, 125 and the number and configuration of each group may differ from portion to portion of the different body portions 12.
Although
The seam 117 can be used to replace the seam 17 shown in
In either seam 17 or 117, the coupling filament 24 can form a continuous seam between the end sections 14, 16 so that the belt 10, 110 can be continuous or endless. To help increase the strength of the continuous seam, more than one coupling filament 24 can be used to form the continuous seam between the end sections 14, 16, as described above, depending on the process.
Seams 17, 117 have been described above as having looped segments 26 and 32 that cooperate with one or more coupling filaments 24.
For example,
Although the seam 217 includes looped segments 226, 232, only looped segment 226 is shown in
One end 228 of the looped segment 226 is attached to the end section 14 of the belt 210, at a first horizontally extending filament 222. The opposite end 230 of the looped segment 226 is attached to the end section 14 of the belt 210, at a different horizontally extending filament 222 as the end 228. By attaching the ends 228, 230 to different horizontally extending filaments 222, stress can be distributed and strain can be reduced on the seam 217 and the belt 210. To further distribute stress and reduce strain, adjacent looped segments 226 can have respective ends 230 attached to different horizontally extending filaments 222. In this manner, adjacent ends 230 of the looped segments 226 are staggered so that every other end 230 is attached to the same horizontally extending filament 222.
Alternatively, adjacent groups of looped segments 226 can have respective ends 230 contacted with different horizontally extending filaments 222, with looped segments of each group having an end 230 contacted with the same horizontally extending filament 222.
In this embodiment, ends 228, 230 can be attached to one or more horizontally extending filaments 222 by weaving one or both of the ends 228, 230 about one or more horizontally extending filaments 222 or by bonding, such as welding or fusing, to one or more horizontally extending filaments 222. Alternatively, the ends 228, 230 can extend through holes formed between adjacent filaments 220, 222 and can be bonded together, for example. In this configuration, the ends 228, 230 need not be attached to the belt 210, but rather the attachment of the ends 228, 230 to the belt 210 can be effected by the engagement of the ends 228, 230 with the filaments 220, 222. For example, the ends 228, 230 can be fixedly secured to either the belt 210, the filaments 220, the filaments 222 or to one another.
Each looped segment 332 has ends thereof bonded, fused or connected together so that each looped segment 332 substantially forms a ∞ shape. Each looped segment 332 includes an end portion 334, a connecting portion 335 that connects one end of the end portion 334 to one end of an opposite end portion 336 and a connecting portion 337 that connects another one end of the end portion 336 to the other end of the end portion 334.
In this embodiment, the end portion 334 is formed to have a generally arcuate configuration to receive a coupling filament 24 therethrough. The end portion 334 receives a coupling filament 24 in a similar manner as described above with respect to coupling filament receiving opening 41, for example. The connecting portion 335 extends from the end portion 334 over a plurality of horizontally extending filaments 322 before extending below a plurality of horizontally extending filaments 322 away the coupling filament 24 to connect to one end of the end portion 336. The end portion 336 is formed to have a generally arcuate configuration to contact a selected horizontally extending filament 322. The connecting portion 337 extends from the end portion 336 over a plurality of horizontally extending filaments 322 before extending below a plurality of horizontally extending filaments 322 away the coupling filament 24 to connect to one end of the end portion 334.
When the connecting portion 335 extends from one end the end portion 334 over a plurality of horizontally extending filaments 322, the connecting portion 337 extends below the same plurality of horizontally extending filaments 322 to connect to another end of the end portion 334. Similarly, when the connecting portion 335 extends below a plurality of horizontally extending filaments 322, the connecting portion 337 extends from one end of the end portion 336 above the same plurality of horizontally extending filaments 322. Because of this intersection, each looped segment 332 can be referred to as being in a ∞ shape.
To distribute stress and reduce strain on the belt 310, adjacent looped segments 332 can have respective end portions 336 contacted with different horizontally extending filaments 322, as shown in
As illustrated, the vertically extending filaments 22 are grouped in groups of five filaments. In each group 412, every third and fifth vertically extending filament 22 (as shown left to right in
As illustrated in this embodiment, the board processing machine 500 is a pressed board machine configured to process press board. In this embodiment, the board processing machine 500 can include the process belt 10 trained around a series of processing rolls 502 and another process belt 504 which together pull a board product or other paper product (not shown) therethrough. The board product can include two or more board layers, which are to be joined to one another by a suitable adhesive in the board processing machine 500. The board layers are brought together at one end of the board processing machine 500 and are pulled across a hot roll 506 (or a series of hot plates) by the belts 10, 102 to dry and/or to cure the adhesive which bonds the board layers together. A belt 508 operatively associated with the hot roll 506 can carry the finished board product to another part of the paper production facility.
The board processing machine 500 is not limited to pressed board machines, but can be any processing machine capable of exerting high machine speeds or high stresses onto the belt and requiring a high number of operational cycles. For example, the board processing machine 500 may be able to process oriented strand boards or joists in addition to pressed board.
At 604, at least one first looped segment is attached to the first end section of the process belt and at least one second looped segment is attached to the second end section of the process belt. The first and second looped segments extend between the first end section and the second end section of the process belt and can be aligned to receive at least one coupling filament therethrough. The first and second looped segments can be attached to the first and second end sections of the process belt in various ways, for example, by weaving or bonding as described above with respect to
At 606, at least one coupling filament operatively connects the first end section to the second end section. For example, the coupling filament can be inserted, for example, manually or mechanically, through the first and second looped segments to form a continuous seam between the first end section, the second end section and the body portion. That way, the first end section, the second end section and the body portion are substantially continuous with respect to one another. End portions of the coupling filament can be bent over a number of the first and second looped segments to fixedly secure the coupling filament within the first and second looped segments. At 608, the method ends.
While the present invention has been particularly shown and described with reference to the preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the invention.
Thus, the foregoing embodiments have been shown and described for the purpose of illustrating the functional and structural principles of this invention and are subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.
This application claims the benefit of U.S. Provisional Patent Application No. 60/341,873, “Schmitt Seam,” Maguire et al., filed Dec. 21, 2001, the contents of which are incorporated herein by reference in their entirety.
Filing Document | Filing Date | Country | Kind |
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PCT/US02/40657 | 12/20/2002 | WO |
Number | Date | Country | |
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60341873 | Dec 2001 | US |