Abstract:
A system and a method for providing feedback control of the deposition of superabsorbent particles into an absorbent core at a specified rate are disclosed herein. A control system, such as a programmable logic control device, is used to receive feedback related to the operation of one or more elements of a vibratory feeder. Based on the feedback, the control system adjusts one or more elements of the vibratory feeder to synchronize the operation of the elements of the vibratory feeder. Particularly, the control system can be adapted to synchronize the deposition rate of superabsorbent particles into the absorbent core with the line speed of the absorbent core during ramp-up and ramp-down periods. Based on a predetermined line speed response during the ramp-up or ramp-down period, the control system can control one or more properties of the vibratory motion of a vibrator of the vibratory feeder in such a manner that the deposition rate of superabsorbent particles is proportional to the line-speed of the fibrous material being supplied so that a substantially uniform concentration of superabsorbent materials are deposited in the absorbent core during the ramp-up and ramp-down periods.
Abstract:
An apparatus and method for dry forming absorbent cores are disclosed. The apparatus has a rotatable drum having a substantially cylindrical surface. A vacuum surface having one or more holes is located substantially circumferentially around at least a portion of the substantially cylindrical surface. A vacuum chamber is located within the rotatable drum. The vacuum chamber has one or more vacuum passages forming a vacuum zone subadjacent at least a portion of the vacuum surface. A first casing sheet is supplied to overlie the vacuum surface at a first location, and a fibrous material is supplied to overlie the first casing sheet at a second location. A supply of particulate matter is deposited onto the fibrous material at a third location, and a second casing sheet is supplied to overlie the first casing sheet, fibrous material and particulate matter at a fourth location, thereby forming an absorbent core composite.
Abstract:
An apparatus and method for dry forming absorbent cores are disclosed. The apparatus has a rotatable drum having a substantially cylindrical surface. A vacuum surface having one or more holes is located substantially circumferentially around at least a portion of the substantially cylindrical surface. A vacuum chamber is located within the rotatable drum. The vacuum chamber has one or more vacuum passages forming a vacuum zone subadjacent at least a portion of the vacuum surface. A first casing sheet is supplied to overlie the vacuum surface at a first location, and a fibrous material is supplied to overlie the first casing sheet at a second location. A supply of particulate matter is deposited onto the fibrous material at a third location, and a second casing sheet is supplied to overlie the first casing sheet, fibrous material and particulate matter at a fourth location, thereby forming an absorbent core composite.
Abstract:
A device is provided for folding a material web traveling in a machine direction. The device has a folding portion having a leading edge, a breaking wing attached to the folding portion, the breaking wing having a breaking edge, and a roller rotatably attached to the breaking wing and having a surface and a rotational axis. The rotational axis is along a transverse direction, the transverse direction being substantially perpendicular to the machine direction. The roller is for supporting a roller portion of the material web as the material web is fed to the folding portion, and the breaking wing is for supporting a wing portion of the material web as the material web is fed to the folding portion. The surface of the roller is positioned in the transverse direction at a first angle relative to the rotational axis, the breaking edge of the breaking wing is positioned in the transverse direction at a second angle relative to the rotational axis, and the first angle is different from the second angle.
Abstract:
A hitch drawbar is provided that supports a hitch ball and a winch accessory mount for supporting a winch or similar accessory above the draw bar. The draw bar includes a first end and a second end. The first end is adapted to be received and secured by a vehicle hitch receiver. The second end supports a hitch ball therefrom. Along the draw bar length, the winch accessory mount extends upwards. The winch accessory mount supports a winch surface above the draw bar and substantially parallel thereto. Along the surface, a winch may be supported. In addition, the winch surface may support alternative accessories thereon. Several embodiments are disclosed, including slidable configurations of the hitch ball surface and slidable configurations of the winch accessory mount and winch surface. Overall, the present invention provides a new and novel draw bar and hitch accessory mount.
Abstract:
A data-driven, hierarchical information navigation system and method enable search of sets of documents or other materials by certain common attributes that characterize the materials. The invention includes several aspects of a data-driven, hierarchical navigation system that employs this navigation mode. The navigation system of the present invention includes features of an interface, a knowledge base and a taxonomy definition process and a classification process for generating the knowledge base, a graph-based navigable data structure and method for generating the data structure, World Wide Web-based applications of the system, and methods of implementing the system. Users are able to search or browse a particular collection of documents by selecting desired values for the attributes. A data-driven, hierarchical information navigation system and method enable this navigation mode by associating terms with the materials, defining a set of hierarchical relationships among the terms, and providing a guided search mechanism based on the relationship between the terms. In another aspect of the invention, implementations of the invention may be scalable through parallel or distributed computation. Implementations of the invention may employ master and slave servers in a hierarchical configuration.
Abstract:
A data-driven information navigation system and method enable search and analysis of a set of objects or other materials by certain common attributes that characterize the materials, as well as by relationships among the materials. The invention includes several aspects of a data-driven information navigation system that employs this navigation mode. The navigation system of the present invention includes features of a knowledge base, a navigation model that defines and enables computation of a collection of navigation states, a process for computing navigation states that represent incremental refinements relative to a given navigation state, and methods of implementing the preceding features.
Abstract:
A drive system for a refrigeration compressor such as is used in a natural gas liquefaction plant, allowing the desired compressor speed and maximum turbine efficiency to be maintained throughout varying ambient temperature conditions. A gas turbine is used with an electric starter motor with drive-through capability located on a common drive shaft between the turbine and the compressor. A variable frequency drive (VFD) is connected between the electrical power grid and the electric motor for smooth startups, but also to allow excess turbine mechanical power to be converted to electrical power by the motor operating as a generator, and delivered to the grid at the grid frequency. Pulse width modulation technology may be used to reduce harmonic distortion in the VFD's output. The starter motor also functions as a helper motor when the turbine output is insufficient to drive the compressor at the rotational speed needed to meet throughput requirements.
Abstract:
An apparatus and method for forming tow-based absorbent structures having a single casing sheet are disclosed. The apparatus has a tow supply mechanism for providing tow material, a particulate matter supply mechanism for providing particulate matter, and a casing sheet supply mechanism for providing casing sheet material. The apparatus also has a vacuum draw roll having a foraminous center surface that has a width defined by a first edge and a second edge and is rotatable about a first axis. The vacuum draw roll is positioned to receive the tow material, the particulate matter and the casing sheet material to form a open core composite supply. The apparatus also has one or more angled surfaces positioned to create one or more obtuse angles in the open core composite supply, and one or more folders to further fold the one or more obtuse angles in the open core composite supply to form a folded core composite supply.
Abstract:
In the particular embodiments described, an unlimited voltage static power converter includes an array of multi-level phase drivers consisting of a plurality of H-bridge power modules connected in series. The midpoint node of the series-connected power semiconductors is connected to corresponding midpoint nodes in adjacent H-bridges to achieve a desired high output voltage using available power switch ratings. A three-dimensional multi-level, multi-phase, multi-circuit array of H-bridges permits the use of the static power converter for high power applications, while providing a high degree of power quality. The power semiconductor switches are operated in accordance with a two-dimensional interleaved pulse width modulation algorithm which produces a waveform with a switching frequency that can be more than an order of magnitude higher than the switching frequency of a single power switch. PWM complementary triangle carrier waves are used for individual PWM control of each H-bridge in each multi-level phase driver, resulting in a two-dimensional interleaved control algorithm. Injection of harmonic or non-harmonic content into the PWM reference waveform further reduces harmonic and non-harmonic content of the output voltage waveforms. Part-load efficiency is increased using unique load partitioning methods, five of which are described herein.