JPS55127121A - Preparing method of filter material having density gradient - Google Patents

Preparing method of filter material having density gradient

Info

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
Application number
JP3321779A
Other languages
Japanese (ja)
Inventor
Korenori Kobayashi
Noriji Muraoka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsui Petrochemical Industries Ltd
Original Assignee
Mitsui Petrochemical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsui Petrochemical Industries Ltd filed Critical Mitsui Petrochemical Industries Ltd
Priority to JP3321779A priority Critical patent/JPS55127121A/en
Publication of JPS55127121A publication Critical patent/JPS55127121A/en
Pending legal-status Critical Current

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
JP3321779A 1979-03-23 1979-03-23 Preparing method of filter material having density gradient Pending JPS55127121A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
FI953547A0 (en) Method of making a nonwoven fabric and a nonwoven fabric
KR850007547A (en) Shoe member and its manufacturing method
KR840003712A (en) Manufacturing method of heat adhesive nonwoven fabric
EP0171806A3 (en) An entangled nonwoven fabric including bicomponent fibers and the method of making same
FR2547577B1 (en) COMPOSITE REFRACTORY MATERIAL REINFORCED WITH REFRACTORY FIBERS AND MANUFACTURING METHOD THEREOF
DE3689638D1 (en) Multilayer fiber product containing meltable and microfine fibers.
SE8302233D0 (en) PROCEDURE FOR THE MANUFACTURE OF FIBER ARMED FORMS
KR890013258A (en) Reinforced Bulky Nonwovens
ATE165043T1 (en) HIGH TEMPERATURE RESISTANT COMPOSITE MATERIAL WITH A HONEYCOMB STRUCTURE AND METHOD FOR THE PRODUCTION THEREOF
ES8801499A1 (en) A laminate sheet and a process for making the sheet.
ES285102Y (en) CAMOUFLAGE DEVICE OR THERMAL MASKING
DK0646193T3 (en) Plant composite material comprising a perforated foil and thermoplastic fibers, its use and its method
GB1551287A (en) Method and machine for forming lignocellulosic fibre mats
KR840006026A (en) Method and apparatus for manufacturing nonwoven fabric
ATE43655T1 (en) SAMPLE COMPACT FABRIC CONTAINING CONJUGATED FIBERS.
JPS55127121A (en) Preparing method of filter material having density gradient
GB2015604A (en) Air laying bonded fibre structures
JPS5625417A (en) Preparation of formed ceiling substrate for automobile
DE3376112D1 (en) Method of making a fibre-reinforced composite ceramic material
EP0120579A3 (en) Method of print bonding non-woven webs
ATE20254T1 (en) PROCESS FOR CONTINUOUS MANUFACTURE OF FIBER REINFORCED WEBS.
JPS5361581A (en) Paper sheet containing activated carbon and production thereof
JPS6469332A (en) Manufacture of permeable composite film
ES457627A1 (en) Method for producing needle feldle and patterned non wovenfabric
GB1527169A (en) Methods of continuously producing prepregs