삼보과학

[기공측정] Microfiltration membrane의 기공구조 측정
작성자 : 삼보과학 작성일 : 2011-04-06 조회수 : 5295
파일첨부 :
아래 논문은 PMI사의 Dr. Gupta 와 Mr. Dixon에 의해 발표된 microfiltration membrane의 기공구조 측정에 대해 소개한 것이다. microfiltration membrane은 의학, 제약, 정수, 용제 정제 등의 수많은 여과산업분야에서 광범위하게 사용되고 있다. 이러한 특수 멤브레인을 공업용으로 널리 사용하게 됨으로써 제품의 성능 및 품질관리 개선에 대한 관심이 증가하고 있다. 이로 인하여 생산단계에서 뿐만 아니라 사용단계에서조차 멤브레인의 물리적 특성 측정을 필요로 하게 되었다. Capillary Flow Pormetery는 이러한 멤브레인의 중요한 특성들에 대한 정보를 제공할 수 있는 특성측정기술이다. 이 논문에서는 자동화 테스트에서 새로 개선된 점을 거론하고, Porometry의 기초원리를 자세히 설명하고 있으며, 결과의 해석에도 특히 초점을 맞추고 있다. 아래에서는 이 논문의 처음부분과 마지막 부분만을 발췌하여 옮겨놓았다. (전체 자료가 필요하신 분은 전화나 이메일로 연락주시기 바랍니다.) Characterization of Pore Structure in Microfiltration Membranes by Dr. Krishna M. Gupta & Mr. Jeffrey S. Dixon Porous Materials Inc. USA ABSTRACT Microfiltration membranes have become widely used in a number of filtration application, including medical, pharmaceutical, water purification, and solvent purification. The widespread industrial use of these specialized membranes has led to an increased focus on improving product performance and quality control. This requires intensive physical characterization of the membranes not only at the production level, but also at the end-suer stage. Capillary Flow Porometry is a characterization technique that can provide information on critical properties of these membranes. Porous Materials Inc. has refined this long-standing technique in order to serve the filtration industry more effectively. These new refinements result in improved accuracy, improved repeatability, and complete objectivity of the test. This paper will discuss these new advances in automated testing, and will cover the basic principles of Porometry, with a particular focus on interprtation of results. INTRODUCTION The microfiltratin industry has undergone tremendous growth in the last decade, as has the entire filtration industry This is in part due to an increased demand for recycling of resources such as industrial solvents and water. Filtration products are also under increasing scrutiny for improved performance. The need for better filter testing has grown along with the industry and is therefore imperative. Porous Materials Inc. has been making porosity testing instruments for the last 17 years and has developed some of the most advanced instruments for testing of filter materials. This paper discusses current technology as well as recent trends and innovations in the field. The critical physical properties of a filter include the following : 1. Largest Pore Size (Bubble Point) - Determines the largest substance which can pass through the filter 2. Average Pore Diameter - Determines the most efficient size range of filtration 3. Pore Size Distribution - Determines the precision of the filtration process 4. Gas Permeability - Rate of filtration 5. Liquid Permeability - Rate of filtration 6. Filter Integrity - More accurate check of Largest Pore Size All of the above information can be obtained via Capillary Flow Porometry testing on the PMI Complete Filter Analyzer. The Capillary Flow Porometry technique has been in place for over 50 years, but has typically suffered form a lack of accuracy, repeatability, and objectivity. As such, manufacturers of filter materials and end-users of their products have been reluctant to use this technique to any great extent in product development and quality control. The key factor in any reliable analytical technique is the ability to measure both accurately, and precisely. In this case, the more accurately and precisely pore structure can be characterized, the better product performance and consistency can be controlled both by manufacturers and end-users. PMI has concentrated on developing a testing system which satisfies the above criteria. Furthermore, it is also important to measure not only the media but also complete produts, which come in an enormous variety of sizes and shapes. The complete filter analyzer was developed by Porous Materials Inc. several years ago to address these needs and has subsequently gone throuh a series of improvements. This paper will attempt to present the basic theory and operation of the instrument, typical test results and their interpretation, as well as future trends in the industry. - 중략 - FUTURE TRENDS New ideas in porometry are constantly being explored. Presently, the most active areas are the following: 1. Extending the range of pore size Interest in extending the pore size range constitutes the most common request PMI receives. Since the introduction of the first PMI Complete Filter Analyzer with a capability of 100PSI, significant progress has been made. The Complete Filter Analyzer with a 500PSI capability will soon join our standard product line, extending the testabel range of pore sizes down to 0.0133 um. For the larger pores, we have introduced our model X which features a more precise pressure delivery system and more accurate pressure measurements. Wo가 on new wetting fluids with high and low surface tensions, as well as some other novel ideas such as a two fluid system which would allow for very low "effective" surface tensions, is presently underway. 2. Ease of use Both hardware and software modifications are being engineered to grant access to this technology to increasing numbers of end-users. 3. More automation Work is in progress to further automate the testing process by automating sample preparation, by further streamlining the operating software, and by introducing multi-sample instruments. 4. Multiple sample testing capabilities Instruments will be available by January 1996 which will allow testing of more than one sample at one time. This reduces user interaction with the instrument, and is ideal for quality control work. 5. Improved data manipulation Software improvements are constantly being made by PMI, most of these in response to customer feedback. Multicolor graphics and data overlays are now available as well as data format usable by Excel and other spreadsheet programs. Real time comparison with standards and a Go/NoGo report are being worked on which will allow immediate confirmation of results. 6. Ability to test larger parts Work is almost complete on a high flow version of the filter analyzer which allows gas flow rates of up to 5000 standard listers per minute. This allows testing of much larger samples(such as a complete filter cartridge) than currently possible. 7. Higher accuracy PMI is constantly striving to improve the accuracy of its instruments. Use of more advanced components and electronic circuitry, as well as better instrument controls. are being planned to achieve these goals. 8. Assembly line testing One of our goals is to create an instrument which will test the material without having to take a sample form a continuously processed material. Engineering work is in progres towards this goal. In short, we hope this paper has given sufficient background for understanding what porometery can de. Understanding the limitations of the method is crucial to making the most of the test results. A demonstration of the PMI Complete Filter Analyzer can be arranged by contacting us. - 끝 -

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