This week, especially because it’s December and so close to the Christmas holiday, I worked on an alarming application that involved a static hazard. 100% ethanol was poured from a plastic container, which held approximately 5 gallons of the liquid, into smaller or larger containers that were also made of plastic. Ethanol is a colorless, volatile liquid. Most people recognize it as the ingredient in liquor, which has an intoxicating effect on most people. However, it is also used as a solvent which can ignite under certain conditions. Static electricity is one of the three components necessary to create an event, which is a soft way of saying an arc-over, a fire or an explosion. The other two ingredients are oxygen and a volatile vapor.
There are well established protocols for handling and working with ingredients that can go “boom in the night”. The front line of defense in protecting oneself from mishaps is grounding everything that is capable of being grounded. If we take a simplistic approach and look at the world as being made of only two materials, insulators and conductors, you can get a better sense of safety procedures that will keep to us out of harm’s way. Metal is a conductor and easily grounded by clamping onto a known building ground or electrical ground or even by driving a rod deep into the earth. Hence, we call it an earth ground. A water pipe inside of a facility can also act as a good ground source. By grounding the metal, electrons can flow through the metal to ground itself. Conversely plastic cannot be grounded. This is why my static application hit a bump in the road. Static is generated on plastic materials through friction which we call Tribocharging. There are a myriad of types of plastic, but for the most part, assume that all plastics are huge static generators. Plastics are insulators and not conductive so the energy generated by simply handling plastic stays on the surface and can be a source of ignition.
In my static hazard application, an ungrounded person holding the ethanol picks up an ungrounded plastic container and pours it into another ungrounded container. This is not a good situation. During the pouring process, a potentially explosive, volatile vapor cloud forms around the pouring action in both the dumping container and the receiving container. There are three possible opportunities that can cause ignition in this scenario: a discharge from the ungrounded tech who is pouring the flammable ethanol; a discharge from static on the container which is high enough in proximity to the vapor cloud which forms in the discharging plastic container; a discharge from static to the same cloud that can form in the receiving plastic container. If a static charge is present, with enough energy behind it, there is a strong chance that any of these actions can create a safety hazard.
A Grounding Solution
Finding a solution to this problem can be a bit tricky. The basic approach is to ground everything that can be grounded or switch to materials that can be grounded. Simply switching from plastic containers to metal is a huge step in the right direction. There will be times when grounding is not possible and materials cannot be changed. In that case, ionization is the only choice. There are approved ionizing static bars and blowers that remove or greatly reduce static electricity on plastic materials. Static Clean will be introducing a new line of ionizers in partnership with Fraser Antistatics of the UK to address these dangerous scenarios. When you have concerns about your facility and the safety of workers who may be in harm’s way, please reach out to Static Clean for help. At this special time of year as with any time of year, it is important to always think “safety first”.
Let’s face it, the Medical Device Manufacturers have come under scrutiny, not only from their customers, but also from the FDA in an effort to create a manufacturing environment that has less particulate which can impact quality. Static Clean International manufactures static control and particle source-capturing products that aid in this effort by reducing particles at critical points in the process. Three of the most critical areas in the process are at the molding, assembly, and packaging stages of these medical devices. Packaging is the primary source of foreign particles in the process. Remember, these packages are going to house a medical device that eventually ends up at a hospital or a clinic for use on patients where “clean” is critical.
Medical Clean Room Test Environment
Customers ask us how well our Medical Cleaning Systems work and to what level our “Clean and Pack” system helps to reduce contaminants. In an effort to guarantee success, Static Clean International recently installed a brand new ISO Class 7 Clean Room that is fully equipped with products that are designed to reduce particles, lower rejects and improve yields. Customers are invited to visit our facility, bring their trays or devices into our clean room, and learn first-hand the value that Static Clean and its products bring to the Medical Industry.
The Summer Olympics are in full swing and the elite athletes are always trying to find ways to achieve peak performance. Sometimes the difference between winning a gold or silver medal is decided on a tiny margin and can depend on achieving the smallest advantage. This year the 2016 Summer Olympics are being held in Brazil and temperatures are slated to be in the mid 80’s during the day with high humidity. Manufacturers of sporting apparel spend huge sums of money on the research and development of clothing and other products that work with the human body. Athletic shoes have been engineered to be lighter with better foot protection, and clothing has been made to feel so minimal it’s like wearing nothing at all. The integration of Lycra® fabric is one of the most common innovations in achieving comfort, fit and performance.
How Lycra® Moves Us
Lycra® is a registered brand name for a polyurethane-based synthetic fiber that’s also called spandex or elastane. The DuPont Company® first developed Lycra® in 1958 to replace latex rubber as a stretching agent in clothing. Lycra® is prized for its strength and durability, and is almost always mixed with either cotton or polyester. Although Lycra® accounts for only a small percentage of the final fabric, it is key in retaining the look and feel of the other fibers. An estimated 80% of clothing sold in the United States contained spandex in 2010. Because of its ability to mold to the body, Lycra® is ideal for use in swimwear and sportswear. It was once thought 100% cotton was best for sportswear because of its ability to breathe. Science has actually shown us that 100% cotton can raise body temperature, making it difficult to move at a high levels of performance.
The Buzz About Lycra®
The buzz word today is to look for clothing that will wick sweat away from an athlete’s skin. How does this help someone towards a competitive advantage, and how does it work? For the sake of discussion, let’s focus on swimming. According to Aqua Sport West, high performance athletes care more about reducing suit drag, skin friction and water absorption. Lycra® along with other fabrics containing Lycra® offer the best performance and value. It is actually hard to find any cotton in good swimwear these days. Reducing drag is probably the most important factor. As the material or a body moves, the lower the frictional impact of a material against air, wind or water, the more a body can lower its resistance. This is very similar to static electricity when the lowest coefficient of friction will lower the static on a body or material.
Lycra® is a highly static material, but when intimate to the human body, the level of static is lowered. That is why you see swimmers use bathing suits like Speedo® that are tight fitting. The same can be said for those who wear tight clothes when racing bicycles.
The Static Eliminator
At Static Clean International we work with some of the world’s largest manufacturers of Lycra®, Polyester and other well accepted athletic materials. During the weaving process of these materials, the static levels are very high and many of the defects found in these materials are due to static during the processing. A little static cling can cause high defect rates, especially when running high speed clothing manufacturing equipment. Our products eliminate static during the manufacturing process. However, once the finished product is on the human body, the static is collapsed by being intimate to the body and static is no longer an issue. We have a keen understanding of how frictional forces during a race or a swim meet are reduced because the material of choice has a lower coefficient of friction that allows the clothing to have less resistance in motion. From our position, we can feel good about the fact that we have helped those who compete by improving the quality of what they wear.
On Daddy-Daughter Day, it gives dads everywhere a chance to evaluate the job they’ve done in raising their daughters. It has been said that Dads have a tremendous impact on their daughter’s self-esteem and confidence.
A Positive Force…
Many times you read about the friction between daughters and their dads. In my case, especially with my daughter Jules, friction is a positive force. We make a living working closely together at Static Clean International fixing problems for companies that are impacted by the friction forces that create static electricity. For many of the factories that process plastic products, static means downtime. We’ve become experts at handling friction in our personal and professional lives. We would like to wish all dads and daughters a great day today and may the force be with you, especially if it is the positive force that bonds families.
“All That Glitters Is Not Gold” Not everything that is shiny and superficially attractive is valuable.
The original form of this phrase was ‘all that glisters is not gold’. The ‘glitters’ version long ago superseded the original and is now almost universally used.
Shakespeare is the best-known writer to have expressed the idea that shiny things aren’t necessarily precious things. The original editions of The Merchant of Venice, 1596, have the line as ‘all that glisters is not gold‘. ‘Glister’ is usually replaced by ‘glitter’ in modern renditions.
Sometimes the smallest parts are the trickiest to clean. At Static Clean our customers often bring us size challenging parts and devices to work on. Until recently no one in our industry has been able to address these challenges. Static Clean has now developed a method using our MCS and MCS-AS cleaning benches to batch clean these small part products. Static Clean came up with a method using our MCS and MCS-AS cleaning benches to batch clean these products with small parts. We have a Stainless Steel sieve that is fed through the upper and lower hoods that are part of our MCS line. We had a potential customer from New Jersey who was amazed at how well it worked. Before he arrived, he went to a Michael’s store with his daughter and bought all kinds of colorful glitter that you would use for arts and crafts. He used the glitter to contaminate the white caps that you see in the video. It was overkill but a very good test. The white caps that you see here go on the top of things such as suspension bottles, eye drop bottles, contact lens cleaning bottles etc. If they have particles, plastic bits, human hair or any foreign matter, it could be the cause of a health problem. Our batch cleaning system worked so well that he has said he is interested in purchasing not one but two MCS Systems and commented that “it worked better than I ever anticipated”.
For more information on our MCS or MCS-AS Cleaning benches visit our website or contact our technical sales department today.
Static Clean International has developed a new breed of transformer-based high-voltage line-frequency AC power supplies (e.g. TSN75A and TNS75E 7500Vac PSs) relying upon patent-pending technology for application in ionizing equipment. This new technology has been so far applied within SCI static-neutralizing equipment systems and within SCI ionizing blowers.
The longstanding conventional technology within the industry relies upon the use of sound-muffling and corona-resistant materials to pot over the underlying iron-core transformer. The high-voltage secondary winding of the iron-core transformer generates partial discharge of encapsulated air bubbles at normal operating voltages. This limits MTBF of such equipment due to eventual chemical breakdown of the organic polymers subjected to the continuous slow and insidious damage from corona.
The user HV connections (if applicable, as in some static-neutralizing systems with HV-cable user-mounted components) in the conventional power supplies also require proprietary methods and tooling to fabricate the secondary section of the transformer that are only used within the ionizing equipment industry for the most part.
Warning! High Voltage..
SCI’s new technology is a form of resistive coupling between transformer secondary winding and ionizing electrodes circuitry. It enables the use of more common transformer fabrication methods and raises the partial-discharge inception voltage (aka PDIV) to levels above normal operating voltage for the equipment. It provides some regulation (i.e. high-voltage stability) for non-ferroresonant HV transformer topologies, and it enables the quick-connect/disconnect de facto standard (threaded spring-contact) for ionizing equipment systems that contain a user-mounted HV-wire component as well as similar equipment-internal spring-contact HV connections that are desirable for assembly and reliability.
We at SCI believe that a superior cost-performance-quality trade-off can be achieved with the new transformer/resistive-coupling methods for some products, and are continuing with ongoing new product development based upon this proprietary technology and provides a high reliability solution. New products in the field have demonstrated excellent robustness with respect to the common failure mode of HV-secondary dielectric breakdown.