JPS5411173A - Manufacture of synthetic resin foam having density gradient - Google Patents

Manufacture of synthetic resin foam having density gradient

Info

Publication number
JPS5411173A
JPS5411173A JP7733677A JP7733677A JPS5411173A JP S5411173 A JPS5411173 A JP S5411173A JP 7733677 A JP7733677 A JP 7733677A JP 7733677 A JP7733677 A JP 7733677A JP S5411173 A JPS5411173 A JP S5411173A
Authority
JP
Japan
Prior art keywords
synthetic resin
resin foam
manufacture
density gradient
pependicular
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.)
Granted
Application number
JP7733677A
Other languages
Japanese (ja)
Other versions
JPS574485B2 (en
Inventor
Tae Satou
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.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
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 Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP7733677A priority Critical patent/JPS5411173A/en
Publication of JPS5411173A publication Critical patent/JPS5411173A/en
Publication of JPS574485B2 publication Critical patent/JPS574485B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Filtering Materials (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Laminated Bodies (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Molding Of Porous Articles (AREA)

Abstract

PURPOSE: To obtain the title foam usable for dust removing filters, etc., wherein the density decreases from one side to another, by hot-pressing a synthetic resin foam plate from both sides in the thichness direction, followed by cutting in the direction pependicular to the thickness direction.
COPYRIGHT: (C)1979,JPO&Japio
JP7733677A 1977-06-29 1977-06-29 Manufacture of synthetic resin foam having density gradient Granted JPS5411173A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7733677A JPS5411173A (en) 1977-06-29 1977-06-29 Manufacture of synthetic resin foam having density gradient

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7733677A JPS5411173A (en) 1977-06-29 1977-06-29 Manufacture of synthetic resin foam having density gradient

Publications (2)

Publication Number Publication Date
JPS5411173A true JPS5411173A (en) 1979-01-27
JPS574485B2 JPS574485B2 (en) 1982-01-26

Family

ID=13631072

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7733677A Granted JPS5411173A (en) 1977-06-29 1977-06-29 Manufacture of synthetic resin foam having density gradient

Country Status (1)

Country Link
JP (1) JPS5411173A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5771618A (en) * 1980-10-18 1982-05-04 Bridgestone Corp Filter
JP2018197835A (en) * 2017-05-25 2018-12-13 富士ゼロックス株式会社 Developing device and image forming apparatus
JP2020181047A (en) * 2019-04-24 2020-11-05 名古屋油化株式会社 Sound absorber and manufacturing method of the same
EP4198635A1 (en) * 2021-12-16 2023-06-21 Ricoh Company, Ltd. Developing apparatus, developer for electrophotographic image formation, electrophotographic image forming method, and electrophotographic image forming apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5771618A (en) * 1980-10-18 1982-05-04 Bridgestone Corp Filter
JP2018197835A (en) * 2017-05-25 2018-12-13 富士ゼロックス株式会社 Developing device and image forming apparatus
JP2020181047A (en) * 2019-04-24 2020-11-05 名古屋油化株式会社 Sound absorber and manufacturing method of the same
EP4198635A1 (en) * 2021-12-16 2023-06-21 Ricoh Company, Ltd. Developing apparatus, developer for electrophotographic image formation, electrophotographic image forming method, and electrophotographic image forming apparatus
US11934145B2 (en) 2021-12-16 2024-03-19 Ricoh Company, Ltd. Developing apparatus, developer for electrophotographic image formation, electrophotographic image forming method, and electrophotographic image forming apparatus

Also Published As

Publication number Publication date
JPS574485B2 (en) 1982-01-26

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