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1. WO2002007943 - METHOD OF RADIATION TREATMENT FOR FLUOROPOLYMER MATERIALS

Publication Number WO/2002/007943
Publication Date 31.01.2002
International Application No. PCT/US2001/023155
International Filing Date 23.07.2001
Chapter 2 Demand Filed 11.02.2002
IPC
B29B 13/08 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
13Conditioning or physical treatment of the material to be shaped
08by using wave energy or particle radiation
B29C 35/08 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
35Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
02Heating or curing, e.g. crosslinking or vulcanising
08by wave energy or particle radiation
CPC
B29B 13/08
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
13Conditioning or physical treatment of the material to be shaped
08by using wave energy or particle radiation
B29C 2035/0877
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
35Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
02Heating or curing, e.g. crosslinking or vulcanizing ; during moulding, e.g. in a mould
08by wave energy or particle radiation
0866using particle radiation
0877using electron radiation, e.g. beta-rays
B29K 2027/12
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR ; MOULDS, ; REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
2027Use of polyvinylhalogenides ; or derivatives thereof; as moulding material
12containing fluorine
Y10S 522/911
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
522Synthetic resins or natural rubbers -- part of the class 520 series
911Specified treatment involving megarad or less
Applicants
  • STERIS INC. [US]/[US]
Inventors
  • KORENEV, Sergey, Alexandrovich
  • MASEFIELD, John
  • KRIEBEL, Jerry
Agents
  • KOCOVSKY, Thomas, E., Jr.
Priority Data
09/624,31024.07.2000US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) METHOD OF RADIATION TREATMENT FOR FLUOROPOLYMER MATERIALS
(FR) PROCEDE DE TRAITEMENT PAR RAYONNEMENT DE MATERIAUX A BASE DE POLYMERES FLUORES
Abstract
(EN) A source of radiation (10, 12), particularly a pulsed accelerated electron beam, directs a beam of radiation through an irradiation chamber (14, 50). The irradiation chamber is depleted of oxygen and oxygen containing gases, such has being drawn to a vacuum of 10-1 or greater Torr by a vacuum pump (20, 52). Particulate fluoropolymer material is entrained (36) in substantially oxygen free gas and conveyed through the irradiation chamber. The accelerated electrons break chemical bonds in the fluoropolymer particles and electrostatically charge the particles. Magnetic fields (42, 60) of different polarity rotate the charged particles such that they are irradiated from different sides. The irradiated fluoropolymer particles are cooled (24) and separated (26) from the entraining gas. The entraining gas is recirculated through pneumatic line (34) for a continuous cycle. In an alternate batch processing embodiment, the fluoropolymer material is placed in the shallow container (50) which is sealed and evacuated. The container is conveyed through the pulsed electron beam.
(FR) Une source de rayonnement (10, 12), notamment un faisceau d'électrons accélérés et pulsés, dirige un faisceau de rayonnement à travers une chambre d'irradiation (14, 50). Cette chambre d'irradiation est appauvrie en oxygène et en oxygène contenant des gaz, amenée sous vide à un niveau de dépression égal ou supérieur à 10-1 torr au moyen d'une pompe à vide (20, 52). Le matériau à base de polymères fluorés sous forme particulaire est entraîné (36) dans un gaz sensiblement dépourvu d'oxygène et transporté à travers la chambre d'irradiation. Les électrons accélérés rompent les liaisons chimiques dans les particules de polymère fluoré et les chargent électrostatiquement. Des champs magnétiques (42, 60) de différentes polarités mettent en rotation les particules chargées de sorte qu'elles sont irradiées à partir de plusieurs côtés. Les particules de polymère fluoré irradiées sont refroidies (24) et séparées (26) par le gaz d'entraînement. Ce gaz est recyclé à travers une conduite pneumatique (34) pour permettre un cycle continu. Dans un procédé en discontinu, le matériau à base de polymères fluorés est placé dans un conteneur à faible profondeur (50) scellé et amené sous vide. Ce conteneur est transporté par le biais du faisceau d'électrons pulsés.
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