Electron beam processing


Electron beam processing

Electron beam processing involves irradiation of products using a high-energy electron beam accelerator. Electron beam accelerators utilize an on-off technology, with a common design being similar to that of a cathode ray television.

Electron beam processing is used in industry primarily for three product modifications:
* crosslinking of polymer-based products to improve mechanical, thermal, chemical and other properties,
* material degradation often used in the recycling of materials, and
* sterilization of medical and pharmaceutical goods. [Bly, J.H.; Electron Beam Processing. Yardley, PA: International Information Associates, 1988.]

Crosslinking

The cross-linking of polymers through electron beam processing changes a thermoplastic material into a thermoset. When polymers are crosslinked, the molecular movement is severely impeded, making the polymer stable against heat. This locking together of molecules is the origin of all of the benefits of crosslinking, including the improvement of the following properties:Thermal: resistance to temperature, aging, low temperature impact, etc.Mechanical: tensile strength, modulus, abrasion resistance, pressure rating, creep resistance, etc.Chemical: stress crack resistance, etc.Other: heat shrink memory properties, positive temperature coefficient, etc. [ [http://www.ebeamservices.com/default.htm electron beam processing, sterilization, crosslinking, mail sanitation, decontamination, irradiation - ebeam ] ]

Chain-Scissioning

Chain scissioning or polymer degradation can also be achieved through electron beam processing. The effect of the electron beam can cause the degradation of polymers, breaking chains and therefore reducing the molecular weight. The chain scissioning effects observed in polytetrafluoroethylene (PTFE) have been used to created fine micropowders from scrap or off-grade materials. [Bly, J.H.; Electron Beam Processing. Yardley, PA: International Information Associates, 1988.]

Sterilization (microbiology)

Electron beam processing has the ability to break the chains of DNA in living organisms, such as bacteria, resulting in microbial death and rendering the space they inhabit sterile. E-beam processing has been used for the sterilization of medical products and aseptic packaging materials for foods as well as disinfestation, the elimination of live insects from grain, tobacco, and other unprocessed bulk crops. [Singh, A., Silverman, J., eds. "Radiation Processing of Polymers". New York, NY: Oxford University Press, 1992.]

Notes


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • electron-beam processing — elektronpluoštis apdorojimas statusas T sritis radioelektronika atitikmenys: angl. electron beam processing vok. Elektronenstrahlbearbeitung, f rus. электронно лучевая обработка, f pranc. traitement par faisceau d électrons, m; usinage par… …   Radioelektronikos terminų žodynas

  • electron beam processing — noun irradiation using electron beam acceleration rather than heat or chemicals, as for the decontamination of food such as fresh produce and products to be consumed directly …   Australian English dictionary

  • Electron beam lithography — (often abbreviated as e beam lithography) is the practice of scanning a beam of electrons in a patterned fashion across a surface covered with a film (called the resist),cite book |last= McCord |first=M. A. |coauthors=M. J. Rooks |title=… …   Wikipedia

  • Electron — For other uses, see Electron (disambiguation). Electron Experiments with a Crookes tube first demonstrated the particle nature of electrons. In this illustration, the profile of the cross shaped target is projected against the tube face at right… …   Wikipedia

  • Electron crystallography — is a method to determine the arrangement of atoms in solids using a transmission electron microscope (TEM). Contents 1 Comparison with X ray crystallography 2 Radiation damage 3 Protein structures determined by electron crystallography …   Wikipedia

  • Electron microscope — Diagram of a transmission electron microscope A 197 …   Wikipedia

  • electron tube — an electronic device that consists, typically, of a sealed glass bulb containing two or more electrodes: used to generate, amplify, and rectify electric oscillations and alternating currents. Also called electronic tube. Cf. gas tube, vacuum tube …   Universalium

  • Electron backscatter diffraction — An electron backscatter diffraction pattern An electron backscatter diffraction pattern of monocrystalline silicon, taken …   Wikipedia

  • Environmental scanning electron microscope — Wool fibers imaged in an ESEM by the use of two symmetrical plastic scintillating backscattered electron detectors …   Wikipedia

  • Auger electron spectroscopy — (AES; Auger pronounced|oːʒeː in French) is a common analytical technique used specifically in the study of surfaces and, more generally, in the area of materials science. Underlying the spectroscopic technique is the Auger effect, as it has come… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.