KR100322556B1 - Device for drying carrier of wet printer - Google Patents

Device for drying carrier of wet printer Download PDF

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Publication number
KR100322556B1
KR100322556B1 KR1019980007519A KR19980007519A KR100322556B1 KR 100322556 B1 KR100322556 B1 KR 100322556B1 KR 1019980007519 A KR1019980007519 A KR 1019980007519A KR 19980007519 A KR19980007519 A KR 19980007519A KR 100322556 B1 KR100322556 B1 KR 100322556B1
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KR
South Korea
Prior art keywords
carrier
photosensitive belt
drying
collecting
heating roller
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KR1019980007519A
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Korean (ko)
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KR19990074127A (en
Inventor
조민수
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윤종용
삼성전자 주식회사
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Priority to KR1019980007519A priority Critical patent/KR100322556B1/en
Publication of KR19990074127A publication Critical patent/KR19990074127A/en
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Publication of KR100322556B1 publication Critical patent/KR100322556B1/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/161—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G03G15/107—Condensing developer fumes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/1615—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support relating to the driving mechanism for the intermediate support, e.g. gears, couplings, belt tensioning

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Cleaning In Electrography (AREA)

Abstract

PURPOSE: A device for drying a carrier of a wet printer is provided to prevent the damage on the toner on a photosensitive belt and to remove the liquid carrier on the surface of the photosensitive belt. CONSTITUTION: A device for drying a carrier of a wet printer comprises a heating unit for evaporating the liquid carrier remaining on a surface(10a) and a collecting unit for collecting carrier vapors. The heating unit includes a heating roller(32) rotating while making contact with a rear face(10b) of a photosensitive belt(10) and a heater(34) installed in the heating roller. The collecting unit includes a collecting container(42) facing the surface of the photosensitive belt and an intake pump(44) installed in the collecting container.

Description

습식인쇄기용 캐리어 건조장치Carrier Drying Equipment for Wet Printing Press

본 발명은 습식인쇄기용 캐리어 건조장치에 관한 것으로, 상세하게는 감광매체 표면에 부착된 토너의 손상을 방지하면서, 그 표면의 캐리어를 건조시키는 습식인쇄기용 캐리어 건조장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier drying apparatus for a wet printer, and more particularly, to a carrier drying apparatus for a wet printer which prevents damage of toner adhered to a surface of a photosensitive medium while drying the carrier on the surface.

일반적으로 칼라프린터, 복사기 등의 습식인쇄기는 소정의 색상을 가지는 고체상의 토너와, 용매 역할을 하는 액상의 캐리어가 혼합된 현상액을 무한궤도를 주행하는 감광벨트에 형성된 정전잠상에 부착함으로써, 원하는 화상을 얻어내도록 된 프린팅기기이다.Generally, wet printers such as color printers and copiers have a desired image by attaching a developer mixed with a solid toner having a predetermined color and a liquid carrier serving as a solvent to an electrostatic latent image formed on a photosensitive belt traveling in an orbit. It is a printing device to obtain.

도 1은 일반적인 습식인쇄기의 개략적인 구성도로서, 복수의 지지롤러(11)에 지지되어 무한궤도를 주행하는 감광벨트(10)와, 복수의 현상기(13)와, 전사롤러(15) 및 캐리어 건조장치(20)를 포함한다.1 is a schematic configuration diagram of a general wet printing machine, which includes a photosensitive belt 10 supported by a plurality of support rollers 11 and traveling in an endless track, a plurality of developing devices 13, a transfer roller 15, and a carrier. And a drying apparatus 20.

상기 감광벨트(10)는 대전기(12)에 의해 소정전위의 대전상태로 유지되며, 각각의 현상기(13)에 근접설치된 복수의 레이저 주사유니트(14)에서 주사된 빔(beam)에 의해 전위가 변화됨으로써, 정전잠상이 형성된다. 상기 현상기(13)는 토너와, 액상의 캐리어가 혼합된 현상액을 감광밸트(10)의 정전잠상 영역에 선택적으로 부착한후, 토너(T)는 필름화하고 필름화된 토너(T) 이외의 대부분의 캐리어는 제거되도록 한다. 상기 필름화된 토너(T)는 전사롤러(15)에 전사되며, 표면에너지 차이에 의해 전사롤러(15)로부터 그 전사롤러(15)와 정착롤러(16) 사이로 통과되는 인쇄용지(P)에 인쇄된다.The photosensitive belt 10 is maintained in a charged state at a predetermined potential by the charger 12, and is displaced by beams scanned by a plurality of laser scanning units 14 installed close to each of the developing devices 13. By changing, the electrostatic latent image is formed. After the developer 13 selectively attaches a developer mixed with a toner and a liquid carrier to the electrostatic latent image region of the photosensitive belt 10, the toner T is filmed and other than the filmed toner T. Most carriers are allowed to be removed. The filmed toner T is transferred to the transfer roller 15, and to the printing paper P passed between the transfer roller 15 and the fixing roller 16 from the transfer roller 15 by the surface energy difference. Is printed.

상기 캐리어 건조장치(20)는 상기 현상기(13)에서 완전히 제거되지 않고, 감광벨트(10)에 잔류하는 액상의 캐리어를 제거하기 위한 것으로, 건조롤러(22)와 히팅롤러(24)를 포함한다.The carrier drying apparatus 20 is for completely removing the liquid carrier remaining in the photosensitive belt 10 without being completely removed from the developing device 13, and includes a drying roller 22 and a heating roller 24. .

상기 건조롤러(22)는 감광벨트(10)에 접촉회전되면서, 그 감광벨트(10) 표면으로부터 액상의 캐리어를 제거한다. 상기 히팅롤러(24)는 건조롤러(22)에 접촉회전되면서, 상기 건조롤러(22)에 열을 가하여 그 건조롤러(22)에 부착된 액상의 캐리어를 증발시키게 된다. 그리고, 증발된 캐리어증기 중 일부는 건조용기(28) 내에서 액화되어 회수되고, 나머지는 펌프(26)에 의해 흡입되어 소정의 경로를 거치게 된다.The drying roller 22 is rotated in contact with the photosensitive belt 10, to remove the liquid carrier from the surface of the photosensitive belt (10). The heating roller 24 is in contact with the drying roller 22, while applying heat to the drying roller 22 to evaporate the carrier of the liquid attached to the drying roller 22. Then, some of the vaporized carrier vapor is liquefied and recovered in the drying vessel 28, and the other is sucked by the pump 26 to pass through a predetermined path.

그런데, 상기와 같은 구성을 가지는 종래의 캐리어 건조장치는 상기 건조롤러가 토너가 부착된 감광벨트 표면에 직접 접촉회전되므로, 접촉시 건조롤러와의 마찰에 의해 토너가 감광벨트로부터 뜯겨져서 분리되는 현상이 발생하게 된다. 따라서, 최종적으로 인쇄용지에 인쇄되는 화상의 질이 떨어지는 문제점이 있다.However, in the conventional carrier drying apparatus having the above configuration, since the drying roller is in direct contact rotation with the surface of the photosensitive belt to which the toner is attached, the toner is separated from the photosensitive belt by friction with the drying roller during contact. This will occur. Therefore, there is a problem that the quality of the image finally printed on the printing paper is poor.

본 발명은 상기와 같은 문제점을 해결하기 위해 창안된 것으로, 감광벨트상의 토너가 손상되는 것을 방지하면서, 그 감광벨트 표면에 잔류하는 액상의 캐리어를 제거하도록 구조가 개선된 습식인쇄기용 캐리어 건조장치를 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a carrier drying apparatus for a wet printing machine having an improved structure to remove liquid carriers remaining on the surface of the photosensitive belt while preventing the toner on the photosensitive belt from being damaged. The purpose is to provide.

도 1은 종래의 캐리어 건조장치가 채용된 습식인쇄기의 개략적인 구성도.1 is a schematic configuration diagram of a wet printing machine employing a conventional carrier drying apparatus.

도 2은 본 발명의 바람직한 실시예에 따른 캐리어 건조장치가 채용된 습식인쇄기의 개략적인 구성도.Figure 2 is a schematic diagram of a wet printing machine employing a carrier drying apparatus according to a preferred embodiment of the present invention.

< 도면의 주요부호에 대한 간단한 설명 ><Brief description of the main symbols in the drawings>

10..감광벨트 11..지지롤러10. Photosensitive belt 11. Support roller

13..현상기 14..레이저 주사 유니트13. Developing 14. Laser scanning unit

15..전사롤러 32..히팅롤러15. Transfer roller 32. Heating roller

34..히터 42..포집용기34. Heater 42. Collection container

44..흡입펌프44..Suction pump

상기 목적을 달성하기 위한 본 발명에 따른 습식인쇄기용 캐리어 건조장치는 감광벨트 표면에 잔류된 액상의 캐리어를 건조시키기 위한 습식인쇄기용 캐리어 건조장치에 있어서, 상기 감광벨트의 배면을 접촉지지하며, 상기 액상의 캐리어를 건조시키기 위한 열을 발생시키는 히팅수단과; 상기 히팅수단에 의해 증발되는 캐리어증기를 포집하는 포집수단을 포함하는 것을 특징으로 한다.Carrier drying apparatus for a wet printing machine according to the present invention for achieving the above object in the carrier drying apparatus for a wet printing machine for drying the carrier of the liquid remaining on the surface of the photosensitive belt, the contact supporting the back of the photosensitive belt, Heating means for generating heat for drying the liquid carrier; It characterized in that it comprises a collecting means for collecting the carrier vapor evaporated by the heating means.

이하 첨부된 도면을 참조하여 본 발명의 실시예에 따른 습식인쇄기용 캐리어 건조장치를 상세히 설명하기로 한다.Hereinafter, a carrier drying apparatus for a wet printer according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 실시예에 따른 캐리어 건조장치가 채용된 습식인쇄기를 나타내보인 개략적 구성도이다. 여기서, 앞서 도시된 도면의 참조부호와 동일한 참조부호는 동일한 구성요소를 가리킨다.Figure 2 is a schematic diagram showing a wet printing machine employing a carrier drying apparatus according to an embodiment of the present invention. Here, the same reference numerals as the reference numerals of the drawings shown above indicate the same components.

도 2를 참조하면, 본 발명에 따른 캐리어 건조장치는 복수의 지지롤러(11)에 지지되어 무한궤도상을 주행하는 감광벨트(10)에 열을 가하여 토너(T)가 부착된 표면(10a)에 잔류하는 액상의 캐리어를 증발시키는 히팅수단과, 상기 증발된 캐리어증기를 포집하는 포집수단을 구비한다.Referring to FIG. 2, the carrier drying apparatus according to the present invention is supported by a plurality of support rollers 11 to apply heat to the photosensitive belt 10 traveling on an endless track. And heating means for evaporating the carrier in the liquid phase remaining therein, and collecting means for collecting the vaporized carrier vapor.

본 실시예에 있어서, 상기 히팅수단은 상기 표면(10a)에 상반되는 감광벨트(10)의 배면(10b)에 접촉회전하는 히팅롤러(32)와, 상기 히팅롤러(32) 내에 설치된 히터(34)를 구비한다. 상기 히팅롤러(32)는 상기 지지롤러(11)와 마찬가지로, 감광벨트(10)를 지지하며, 그 주행을 가이드하게 된다. 히팅롤러(32)는 소정의 구동수단에 의해 회전구동되면서 감광벨트(10)를 주행구동시킨다. 한편, 감광벨트(10)에 접촉되어 마찰력에 의해 피동회전되도록 할 수도 있다. 이러한 히팅롤러(32)는 감광벨트(10)의 주행경로에 있어서, 현상기(13)와 전사롤러(15) 사이에 설치된다. 상기 히터(34)는 히팅롤러(32) 내에 설치되어 열을 발생시키게 된다. 상기 히터(34)에서 발생된 열은 히팅롤러(32)에 전달되어 상기 표면(10a)에 잔류하는 액상의 캐리어를 증발시키게 된다. 따라서, 상기 히팅롤러(32)는 열전도성이 좋은 금속재질로 이루어지는 것이 바람직하다. 그리고, 히팅롤러(32)는 상기 히터(34)와 일체로 형성될 수도 있다.In the present embodiment, the heating means comprises a heating roller 32 which is in contact rotation with the back surface 10b of the photosensitive belt 10 opposite to the surface 10a, and a heater 34 provided in the heating roller 32. ). The heating roller 32 supports the photosensitive belt 10 similarly to the support roller 11 and guides the driving thereof. The heating roller 32 drives the photosensitive belt 10 while being driven by a predetermined driving means. On the other hand, it may be in contact with the photosensitive belt 10 to be driven by the friction force. The heating roller 32 is provided between the developing machine 13 and the transfer roller 15 in the traveling path of the photosensitive belt 10. The heater 34 is installed in the heating roller 32 to generate heat. The heat generated by the heater 34 is transferred to the heating roller 32 to evaporate the liquid carrier remaining on the surface 10a. Therefore, the heating roller 32 is preferably made of a metal material having good thermal conductivity. In addition, the heating roller 32 may be integrally formed with the heater 34.

상기 포집수단은 상기 감광벨트(10)의 표면(10a)에 대면되는 포집용기(42)와, 상기 포집용기(42)에 설치된 흡입펌프(44)를 포함하여 구성된다. 상기 포집용기(42)는 감광벨트(10)를 사이에 두고, 상기 히팅롤러(32)와 대응되게 설치된다. 상기 포집용기(42)는 상기 증발된 캐리어증기가 인입되도록 일측이 개방된 개방부(42a)를 가진다. 이러한 포집용기(42)에는 회수관(42b)과 연결관(42c)이 설치된다. 상기 회수관(42b)은 포집용기(42) 내에서 액화된 캐리어를 회수하기 위한 것으로, 포집용기(42)의 하측에 마련된다. 상기 연결관(42c)은 증발된 캐리어증기를 액화시키기 위해 소정의 경로로 보내기 위한 통로이다. 이러한 연결관(42c)는 포집용기(42)의 상측에 설치되는 것이 바람직하다. 상기 흡입펌프(44)는 표면(10a)에서 증발되는 캐리어증기를 강제흡입하여 외부로 유출되는 것을 방지하기 위한 것으로, 바람직하게는 상기 연결관(42c)에 설치된다. 이러한 흡입펌프(44)에 의해 포집용기(42) 내로 캐리어증기를 포집하는 것이 가능하고 또한, 포집된 캐리어증기를 연결관(42c)을 통해 소정의 경로로 강제로 보내는 것이 가능하게 된다.The collecting means includes a collecting container 42 facing the surface 10a of the photosensitive belt 10 and a suction pump 44 installed in the collecting container 42. The collection container 42 is installed to correspond to the heating roller 32 with the photosensitive belt 10 interposed therebetween. The collection container 42 has an open portion 42a open at one side such that the vaporized carrier vapor is drawn in. The collection container 42 is provided with a recovery pipe 42b and a connection pipe 42c. The recovery pipe 42b is for recovering a carrier liquefied in the collection container 42 and is provided below the collection container 42. The connecting pipe 42c is a passage for sending a vaporized carrier vapor through a predetermined path to liquefy. The connecting pipe 42c is preferably installed above the collecting container 42. The suction pump 44 is for preventing the outflow to the outside by forcibly sucking the carrier vapor evaporated from the surface (10a), it is preferably installed in the connecting pipe (42c). By this suction pump 44, it is possible to collect the carrier vapor into the collection container 42, and it is possible to forcibly send the collected carrier vapor through a connecting pipe 42c by a predetermined path.

상기와 같은 구성을 가지는 캐리어 건조장치를 사용하면, 상기 히팅롤러(32)가 감광벨트(10)의 상기 배면(10b)에 접촉되어 가열함으로써, 상기 표면(10a)에 필름화된 토너(T)의 손상을 방지하는 동시에 액상의 캐리어만 증발시키는 것이 가능하다. 따라서, 토너(T)의 손상 없이 액상의 캐리어를 효과적으로 제거함으로써, 전사롤러(15)를 통해 그 전사롤러(15)와 정착롤러(16) 사이로 통과되는 인쇄용지(P)에 인쇄되는 인쇄의 질이 향상된다. 그리고, 증발된 캐리어증기는 흡입펌프(44)을 구동시켜 그 흡입력으로 포집용기(42) 내로 포집하여 회수함으로써, 외부로 유출되는 것을 방지할 수 있게 된다.When the carrier drying apparatus having the above structure is used, the heating roller 32 is brought into contact with the rear surface 10b of the photosensitive belt 10 and heated, thereby toner T filmed on the surface 10a. It is possible to evaporate only the liquid carrier while preventing damage. Therefore, the quality of printing printed on the printing paper P passed between the transfer roller 15 and the fixing roller 16 through the transfer roller 15 by effectively removing the liquid carrier without damaging the toner T. This is improved. The vaporized carrier vapor is driven by the suction pump 44 to be collected and collected into the collection container 42 with the suction force, thereby preventing the outflow to the outside.

또한, 종래와는 달리 하나의 히팅롤러(32)로 감광벨트(10)를 지지하는 지지롤러(11)의 기능과, 캐리어를 건조시키는 두가기 기능을 동시에 수행하게 되므로, 부품수가 줄게된다. 따라서, 인쇄기 내의 공간활용도를 향상시킬 수 있다.In addition, unlike the related art, since one heating roller 32 performs the function of the support roller 11 for supporting the photosensitive belt 10 and the knock function for drying the carrier, the number of parts is reduced. Therefore, the space utilization in a printing press can be improved.

본 발명은 비록 첨부된 도면을 참조하여, 한정된 실시예에 대해서만 설명되었으나, 당해 기술분야에서 통상의 지식을 지닌 자라면 본 발명의 사상적 범위 내에서 또다른 변형예가 있을 수 있는 것으로 이해되어야만 한다.Although the present invention has been described with reference to the accompanying drawings only for a limited embodiment, it should be understood that there may be other modifications within the scope of the present invention for those skilled in the art.

상술한 바와 같은 본 발명의 습식인쇄기용 캐리어 건조장치에 따르면, 감광벨트의 제2면에 히팅롤러를 설치함으로써, 감광벨트로부터 토너가 뜯기어 나가면서 손상되는 것을 방지하면서 제1면에 잔류하는 액상의 캐리어를 제거할 수 있다. 따라서, 인쇄용지에 인쇄되는 인쇄의 질을 향상시킬 수 있다.According to the carrier drying apparatus for a wet printer of the present invention as described above, by installing a heating roller on the second surface of the photosensitive belt, the liquid remaining on the first surface while preventing the toner from being damaged by torn off from the photosensitive belt The carrier of can be removed. Therefore, the quality of printing printed on printing paper can be improved.

Claims (3)

감광벨트 표면에 잔류된 액상의 캐리어를 건조시키기 위한 습식인쇄기용 캐리어 건조장치에 있어서,In the carrier drying apparatus for a wet printer for drying the liquid carrier remaining on the photosensitive belt surface, 상기 감광벨트의 배면을 접촉지지하며, 상기 액상의 캐리어를 건조시키기 위한 열을 발생시키는 히팅수단과;Heating means for supporting the rear surface of the photosensitive belt and generating heat for drying the liquid carrier; 상기 히팅수단에 의해 증발되는 캐리어증기를 포집하는 포집수단을 포함하는 것을 특징으로 하는 습식인쇄기용 캐리어 건조장치.And a collecting means for collecting the carrier vapor evaporated by the heating means. 제1항에 있어서, 상기 히팅수단은,The method of claim 1, wherein the heating means, 상기 감광벨트의 배면에 접촉회전되며, 상기 감광벨트의 주행을 가이드하는 히팅롤러와;A heating roller rotating in contact with the rear surface of the photosensitive belt and guiding the traveling of the photosensitive belt; 상기 히팅롤러 내에 설치되어 열을 발생시키는 히터를 포함하는 것을 특징으로 하는 습식인쇄기용 캐리어 건조장치.And a heater installed in the heating roller to generate heat. 제2항에 있어서, 상기 포집수단은,The method of claim 2, wherein the collecting means, 상기 감광벨트를 사이에 두고 상기 히팅롤러에 대응되도록 설치된 포집용기와;A collecting container installed to correspond to the heating roller with the photosensitive belt interposed therebetween; 상기 포집용기 내로 상기 캐리어증기를 강제흡입하도록 상기 포집용기에 설치된 흡입펌프를 포함하는 것을 특징으로 하는 습식인쇄기용 캐리어 건조장치.And a suction pump installed in the collection container to forcibly suction the carrier vapor into the collection container.
KR1019980007519A 1998-03-06 1998-03-06 Device for drying carrier of wet printer KR100322556B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0432842A (en) * 1990-05-29 1992-02-04 Konica Corp Method and device for treating processed waste liquid of non-silver salt photosensitive material
JPH0736327A (en) * 1993-07-21 1995-02-07 Ricoh Co Ltd Image forming material removing device from image holding body by use of adhesive unstabilizing solution, and image holding body processing device
JPH07287489A (en) * 1994-02-28 1995-10-31 Ricoh Co Ltd Method and device for removing image forming substance from image holding body

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0432842A (en) * 1990-05-29 1992-02-04 Konica Corp Method and device for treating processed waste liquid of non-silver salt photosensitive material
JPH0736327A (en) * 1993-07-21 1995-02-07 Ricoh Co Ltd Image forming material removing device from image holding body by use of adhesive unstabilizing solution, and image holding body processing device
JPH07287489A (en) * 1994-02-28 1995-10-31 Ricoh Co Ltd Method and device for removing image forming substance from image holding body

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