Sheet material for extraction, extraction filter, and extraction bag
US10882688B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2017 |
| Grant date | Jan 5, 2021 |
| Priority date | — |
| Expiry date | May 20, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2439/70
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A sheet material for extraction with excellent transparency and extraction properties, is less likely to cause powder leakage, and has high modulus and excellent machine adaptability; an extraction filter; and an extraction bag. The sheet material having a first layer of a spunbonded nonwoven fabric formed from polyester-based fibers having an average diameter of 18 to 28 μm, the fabric having a basis weight of 8 to 19 g/m2; and a second layer of a meltblown nonwoven fabric formed from polyester-based fibers having an average diameter of 16 to 28 μm, the fabric having a basis weight of 2 to 8 g/m2, wherein the sum of the lengths of all fibers included in 1 cm2 of the sheet material for extraction is 3.3 to 4.8 m, and the 3% modulus is 5.5 N or higher; and an extraction filter and an extraction bag formed by this sheet material for extraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.