JPS55127121A - Preparing method of filter material having density gradient - Google Patents
Preparing method of filter material having density gradientInfo
- Publication number
- JPS55127121A JPS55127121A JP3321779A JP3321779A JPS55127121A JP S55127121 A JPS55127121 A JP S55127121A JP 3321779 A JP3321779 A JP 3321779A JP 3321779 A JP3321779 A JP 3321779A JP S55127121 A JPS55127121 A JP S55127121A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- filter material
- density gradient
- needle
- 5w30mm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Filtering Materials (AREA)
Abstract
PURPOSE: To provide a filter material having density gradient in thickness direction by a method wherein plural thin layer webs consisting of mixed short fibers of propylenic resin and ethylenic resin are overlayed one another and are needle punched from one side, then heated to a specified temperature.
CONSTITUTION: Thin layer web of about 10W25g/m2 is formed from mixed fiber consisting of 40W90% of 5W20 denier, 5W30mm long, short fiber made by molten spinning of propylenic resin and 10W60% of 5W20 denier, 5W30mm long, short fiber made of ethylenic resin. The web are laminated in amount of 10W30 sheets and needle punched from one side with 20W50 cycles/cm2 and 5W10mm needle depth. This is heated at a temperature between melting points of both resin, thereby to provide a filter material having density gradient in thickness direction such that density is higher at the side of needle punch.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3321779A JPS55127121A (en) | 1979-03-23 | 1979-03-23 | Preparing method of filter material having density gradient |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3321779A JPS55127121A (en) | 1979-03-23 | 1979-03-23 | Preparing method of filter material having density gradient |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55127121A true JPS55127121A (en) | 1980-10-01 |
Family
ID=12380272
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3321779A Pending JPS55127121A (en) | 1979-03-23 | 1979-03-23 | Preparing method of filter material having density gradient |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55127121A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5171339A (en) * | 1991-11-07 | 1992-12-15 | E. I. Du Pont De Nemours And Company | Filter bag for hot gases |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5031476A (en) * | 1973-07-20 | 1975-03-27 | ||
JPS52152662A (en) * | 1976-06-14 | 1977-12-19 | Matsushita Electric Ind Co Ltd | Filter for vacuum cleaner and like |
-
1979
- 1979-03-23 JP JP3321779A patent/JPS55127121A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5031476A (en) * | 1973-07-20 | 1975-03-27 | ||
JPS52152662A (en) * | 1976-06-14 | 1977-12-19 | Matsushita Electric Ind Co Ltd | Filter for vacuum cleaner and like |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5171339A (en) * | 1991-11-07 | 1992-12-15 | E. I. Du Pont De Nemours And Company | Filter bag for hot gases |
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