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Strands, nettings, dies, and methods of making the same

A technology of stranding and netting, applied in the direction of nets, non-woven fabrics, and other household appliances

Inactive Publication Date: 2014-04-30
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many of these processes require complex dies with moving parts

Method used

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  • Strands, nettings, dies, and methods of making the same
  • Strands, nettings, dies, and methods of making the same
  • Strands, nettings, dies, and methods of making the same

Examples

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no. 1 example

[0044] In some embodiments, the shims will be assembled according to a scheme that provides a repeating sequence of shims of diverse types. Each repeat of the repeating sequence can have a different number of shims. For the first instance, the following combines Figure 7 A repeating sequence of 14 shims is described which, when properly positioned with molten polymer, forms a netting having strands of a single material alternating with core / sheath strands.

[0045] Exemplary channel cross-sectional shapes include square and rectangular. The shapes of the channels within (for example) a repeating sequence of shims may be the same or different. For example, in some embodiments, a gasket that provides a channel between a first cavity and a first dispensing orifice may limit the flow rate compared to a gasket that provides a conduit between a second cavity and a second dispensing orifice. flow. The width of the distal openings within, for example, a repeating sequence of spac...

example

[0176] a kind of like Figure 10 A coextrusion die as generally described in , where three manifold cavities are made. Assemble five unique shims in repeats of 14 shims, with each repeat overall as Figure 6 shown. The first and second spacers are 4 mil (0.102 mm) thick spacer 4440, generally as figure 1 shown. The third, fourth, fifth and sixth spacers are all 4 mil (0.102 mm) thick and have a channel 4568b connected to the first cavity 4462b generally as figure 2 shown. A first cavity 4462b and connected orifice 4566 are provided for extruding a single polymer strand. The seventh and eighth spacers are spacers, the same as the first and second spacers. The ninth and fourteenth spacers are 2 mil (0.51 mm) spacers with a channel connection 4668a to the third cavity 4462a generally as image 3 shown. A third cavity 4462a and channel 4668a are provided for extruding the sheath polymer. The tenth and thirteenth spacers are 2 mil (0.051 mm) thick spacers, overall as F...

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Abstract

Netting comprising an array of polymeric strands, wherein the polymeric strands are periodically joined together at bond regions throughout the array, and wherein at least a plurality (i.e., at least two) of the polymeric strands have a core of a first polymeric material and a sheath of a second, different polymeric material. Nettings described herein have a variety of uses, including wound care, tapes, filtration, absorbent articles, pest control articles, geotextile applications, water / vapor management in clothing, reinforcement for nonwoven articles, self bulking articles, floor coverings, grip supports, athletic articles, and pattern coated adhesives.

Description

[0001] Cross references to related patent applications [0002] This patent application claims priority to US Provisional Patent Application No. 61 / 530521, filed September 2, 2011, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] Polymeric webs are used in a wide variety of applications including reinforcement for paper products or inexpensive fabrics (for example, in toilet paper products, paper garments and heavy packaging bags), nonwoven upholstery fabrics, window coverings, decorative netting , wrapping material, mosquito nets, netting for protective gardens against insects or birds, backing for growing grass or plants, sports netting, light fishing netting and filter material. [0004] Extrusion processes for making polymeric webs are well known in the art. Many of these processes require complex dies with moving parts. Many of these processes can only be used to produce relatively thick netting with relatively ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/04B29C48/05B29C48/12B29C48/13B29C48/30B29C48/305B29C48/345
CPCB29C47/0064B29C2947/92647B29C47/30B29C2947/926B29C47/263D01D5/34B29C47/92B29D28/00B29C47/0014B29L2028/00B29C47/046B29C48/345B29C48/30B29C48/05B29C48/175B29C48/3363B29C48/0021B29C48/305B29C48/18B29C48/92B29C2948/926B29C2948/92647Y10T442/186B29C48/304B29C48/13B29C48/12B29C48/16D04H3/018
Inventor 罗纳德·W·奥森托马斯·P·汉斯申威廉·J·科佩基
Owner 3M INNOVATIVE PROPERTIES CO