摘要:
Nonwoven fibrous webs are formed including a first group and a second group of fibers, where fibers of the first group are imparted with a degree of shrinkage that differs from a degree of shrinkage imparted to fibers in the second group. During or after bonding of the web, the web may be subjected to heat treatment causing fibers in one of the groups to shrink a greater amount in comparison to fibers in the other group, resulting in nonwoven products with desired textures and other physical characteristics.
摘要:
A packer for downhole use features interacting elements of swelling material. Preferably the elements are in contact for relative movement from an initial diameter for run in. As the elements swell, they move with respect to each other to enlarge the diameter of the assembly so that a sealing contact is made. Each element exerts a residual force on the adjacent element to enhance the seal. Each element is preferably coated with a material that allows well fluids to reach the swelling material and then later to stiffen and become impervious from exposure to such fluids. The assembly can be covered for run in to delay the onset of expansion until the target depth is reached for the packer to be set.
摘要:
A blend of conventional carpet fibers (e.g. nylon fibers) and high shrinkage fibers (e.g. acrylic fibers) is described. Saxony carpet made from the blend has better appearance retention characteristics than corresponding saxony carpet made from the conventional carpet fibers.
摘要:
Saxony carpet made from a blend of conventional carpet fibers (e.g. nylon fibers) and high shrinkage fibers (e.g. acrylic fibers) has better appearance retention characteristics than corresponding saxony carpet made from the conventional carpet fibers.
摘要:
A bulky, heatset, tangled, twisted singles carpet yarn is provided having exceptional column strength and resistance to bending and untwisting. Cut pile produced therefrom has excellent tuft rigidity and endpoint definition. The yarn is produced by passing a bulked, twisted singles yarn through a chamber wherein the yarn is tangled and heatset with a heated fluid such as steam.
摘要:
The productivity of the conventional melt spinning process for producing undrawn polyhexamethylene adipamide carpet and tire yarns is increased by utilizing a heat feed roll (e.g. 80.degree. C.) rather than an unheated feed roll and by eliminating the conventional steam conditioning of the yarn and the convergence guide(s) associated therewith.
摘要:
An apparatus for controlling airflow in a fiber extrusion process includes a fiber flow region between an inlet through which extruded fibers are received and an outlet through which the extruded fibers are discharged and at least one surface providing a boundary between the fiber flow region and another region, wherein the surface includes apertures permitting air to flow between the fiber flow region and the other region to control airflow at the outlet of the fiber flow region. The apparatus can include a housing which contains at least one chamber, with the surface forming a boundary between the fiber flow region and the chamber, such that the apertures permit air to flow between the fiber flow region and at the chamber. In a spunbond process, the airflow control device receives drawn filaments exiting an aspirator and deposits the filaments onto a web-forming surface with reduced air disturbance.
摘要:
Thermally divisible multicomponent fibers (4) having at least a first component including an elastomeric polymer (6) and at least a second component including a non-elastomeric polymer (8). The multicomponent fibers are useful in the manufacture of nonwoven structures, and in particular nonwoven structures used as synthetic suede and filtration media.
摘要:
A specially designed pigtail balloon guide for use with ring spinning frames is provided. The guide improves the performance of such frames with respect to sliver breaks and/or sliver throughput. The guide has a single-looped coil through which the sliver is threaded. The coil is designed so that during operation of the frame the coil is tilted with respect to the path of the sliver.
摘要:
A superconductor structure is manufactured by forming a channel within a substrate along a surface of the substrate, depositing a material within the channel of the substrate, where the material includes one of a superconductor material and a precursor for a superconductor material, and thermally treating the substance within the channel of the substrate so as to form an elongated superconductor wire formed as a single, cohesive structure. The substrate can further include a plurality of channels with superconductor wires formed within the channels. In addition, a cable is formed including a bundle of individual superconductor wires arranged at different spatial positions with respect to each other.