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Fiber-forming process

A fiber and equipment technology, applied in the field of improving the direct web forming process, can solve problems such as fiber forming process limitations

Inactive Publication Date: 2008-11-12
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] All of these methods still continue to impose significant constraints on the fiber forming process due to the utilization of process chambers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0056] Fibers were prepared from a number of different polymers listed in Table 1 using the apparatus shown in Figure 1 . Specific components of the apparatus and operating conditions were varied as follows, also listed in Table 1. Table 1 also includes a characterization of the fibers produced.

[0057] Examples 1-22 and 42-43 were prepared from polypropylene; Examples 1-13 were prepared from polypropylene with a melt flow index (MFI) of 400 (Exxon 3505G); and examples 1-13 were prepared from polypropylene with an MFI of 30 (Fina 3868) Example 14; Examples 15-22 were prepared from polypropylene with MFI 70 (Fina 3860); Examples 42-43 were prepared from polypropylene with MFI 400 (Fina 3960). Polypropylene has a density of 0.91 g / cc.

[0058] Examples 23-32 and 44-46 were prepared from polyethylene terephthalate; Examples 23-26, 29-32 and 44 were prepared from PET (3M 651000) with an intrinsic viscosity (IV) of 0.61; Example 27 was prepared from PET with an IV of 0.36; Exam...

Embodiment 38

[0060] Example 38 is a core-sheath bicomponent fiber with the core being the polystyrene used in Example 34 (89% by weight) and the sheath being the copolymer used in Example 37 (11% by weight). Example 39 is a side-by-side bicomponent fiber made from polyethylene (Exxact 4023 with a MFI of 30 from Exxon Chemicals, 36% by weight) and a pressure sensitive adhesive (64% by weight). The adhesive comprised a terpolymer of 92% by weight isooctyl acrylate, 4% by weight styrene, and 4% by weight acrylic acid, had an intrinsic viscosity of 0.63, and was supplied through a Bonnot adhesive extruder.

[0061] In Example 40, each fiber was monocomponent, but using fibers made from two different polymers, polyethylene in Example 36 and polypropylene in Examples 1-13. The extrusion head had four rows of 42 nozzles; the feed to the extrusion head was such that adjacent nozzles in a row supplied a different polymer of the two polymers, forming an A-B-A... pattern.

[0062] In Example 47, a w...

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Abstract

A new fiber-forming method, and related apparatus, are taught in which extruded filaments of fiber-forming material are directed through a processing chamber that is defined by two parallel walls, at least one of which is instantaneously movable toward and away from the other wall; preferably both walls are instantaneously movable toward and away from one another. Movement means provide instantaneous movement to the at least one movable wall. In one embodiment, the movement means comprises biasing means for resiliently biasing the wall toward the other wall. Movement of the wall toward and away from the other wall is sufficiently easy and rapid that the wall will move away from the other wall in response to increases in pressure within the chamber but will be quickly returned to its original position by the biasing means upon resumption of the original pressure within the chamber. In another embodiment the movement means comprises oscillating means for oscillating the wall at a rapid rate. The invention also provides new nonwoven webs, which comprise a collected mass of fibers that includes fibers randomly interrupted by isolated fiber segments that comprise oriented polymer chains but differ in morphology from the main portion of the fiber.

Description

Background technique [0001] In many fiber forming processes, filamentary material extruded from a die is directed through a processing chamber where, for example, the fiber material is drawn, oriented and / or reduced in diameter. Such treatment or attenuation chambers are commonly used in spunbond processes (see US Patent Nos. 3,502,763; 3,692,618; 4,064,605; 4,217,387; 4,812,112; 4,820,459; 5,270,107; 5,292,239; 5,571,537; 5,648,041 and 5,688,468). But it can also be used in other processes such as melt blowing process (see US Patent Nos. 4622259 and 4988560), melt spinning of filaments and filament yarns (see US Patent No. 4202855), and plexifilamentary film fiber materials. in flash spinning. [0002] The use of a treatment chamber imposes constraints on the overall fiber forming process - these constraints attempt to ensure that the fibers will travel efficiently through the chamber without, for example, clogging the chamber. These limitations include limitations on the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H3/16D01D5/098D04H3/02D04H3/03D01D5/20
CPCD04H3/03D04H3/02D04H3/16D01D5/0985Y10T442/60
Inventor 迈克尔·R·贝里根威廉·T·费伊
Owner 3M INNOVATIVE PROPERTIES CO
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