Dynamic Air Inc., a major leader in the dense phase pneumatic conveying industry, is a specialist in the pneumatic conveying of dry, bulk solids. Applications range from food to poison, from light fumed silica to heavy powdered metals. However, all of these applications have one thing in common, the necessity to control the conveying velocity in order to control particle degradation, conveying pipe wear, minimize air consumption, or eliminate pipe line plugging. What is Pneumatic Conveying? Pneumatic conveying is nothing more than creating a pressure differential along a pipeline and moving a bulk material along with the air as the air moves towards the area of lower pressure. This can be done with a vacuum inducer, or with compressed air being injected into one end of or along the pipeline. Dilute Phase vs. Dense Phase Pneumatic Conveying The two most distinct categories of pneumatic conveying can be described as either low pressure (dilute phase) or high pressure (dense phase) systems.
This last April, British environmentalist and adventurer David de Rothschild set sail in a catamaran he had constructed entirely from recycled PET bottles. As a statement to the growing global problem of ocean pollution and the need for higher recycling standards, de Rothschild planned to sail to what Planet Green Bottle calls ‘Plastic Soup’, a floating mass of plastic waste nearly the size of Texas suspended in the middle of the Pacific Ocean. This British adventure-seeker may have found the most creative way yet to call attention to this pending environmental risk, but plastic engineers and manufacturers have been working towards a solution in more conventional ways for many years. Polyethylene terephthalate, or ‘PET’, is a petroleum-based resin and may be broken down and recycled almost indefinitely. The addition of dies, fiberglass and other composite materials reduce PET’s recyclability, but the majority of PET materials, such as the beverage bottles out of which Mr. de Rothschild constructed his boat, are recycled at a cost relative or lower than that of purchasing virgin materials. Still, many water bottles, soda bottles and other beverage containers never make it to the recycling bin, ending up in landfills, or worse: the Pacific’s Plastic Soup.
Architects and building contractors are often faced with many challenging decisions when choosing the right materials for a job. Different types of metals, materials and fabrication methods affect the performance of a structure or facility hugely, and structural sheet metal is no exception. While perforated metals and expanded metals are similar and have some overlapping applications, engineers understand that their capabilities are very different. Not only are perforated and expanded metals separated by their application industries, but by their fabrication methods and cost as well. Perforated metal seems to be the industry standard for architectural applications such as building facades, fences and partitions. Because perforated metals are punched and cut, dies can be designed to cut patterned shapes into sheet metal for a variety of purposes, both decorative and functional. The shape of metal perforations can determine a material’s usefulness for blocking microwaves, sound waves or light; perforated metals are used in all these industries. Next time you warm up some leftovers, take a look at your microwave door. See that filter in the glass? That’s a piece of perforated metal blocking microwaves from coming through the door.
Compact DC-DC converters have made their way into millions of electronic products and systems. The vast majority of these depend upon an AC-DC power supply (metal box or chassis-mount) to convert the AC into a DC voltage from which the converters can operate. In addition, regulations have mandated that these power supplies include Power Factor & Harmonic Correction (PFHC) to maximize the available power from the power grid. Add to this the need to be as small as possible and to operate with in harsh ambient temperatures and the designer is faced with a problem that is not easily solved.
Vacuum forming is a simpler process than injection molding, involving less equipment for the production of parts and requiring less tooling. Vacuum forming companies offer services that are economical yet still give customers the desired design flexibility for a wide range of plastic products because of low-cost tooling modifications. If you are looking for a cost-effective process for creating three-dimensional plastic products with sharp, precise details plus the option for trim and other visually appealing decoration, vacuum forming might just be the ticket. Known as a thermoforming process because it utilizes heat to make the plastic sheet or film pliable enough to form over and around a mold, vacuum forming serves industries such as food, cosmetics, medical, electronics, consumer products, toys, athletic equipment, appliance, automotive, office supplies, etc. The packaging industry deserves a separate mention because it relies heavily on vacuum formed items such as blister packs, inserts, trays and clamshells, all of which act to hold products in place as part of overall packaging protection, plus offer aesthetic appeal.
This paper attempts to identify some of the specifics of the process used to obtain approval for use of plastic pallets as equivalent to wood pallets for use in warehouse storage. This paper is written to look at the issue in general and is not intended to cover all storage situations. Your specific situation should be evaluated by a fire protection specialist. Most plastic pallets are molded out of polyolefin materials such as high density polyethylene or polypropylene. These materials are more flammable than the wood used to make pallets. Over the years the industry has argued with the fire protection establishment that plastic pallets, while they burn hotter than wood, are much more difficult to ignite. Fire protection people counter with the fact that most warehouse fires are arson and if an arsonist wants to start a fire they will do what ever they need to do to get a fire started.
Plastic bags, also called ‘poly bags,’ are one of those modern conveniences we take for granted. But 60 years ago, no one ever considered the question, ‘Paper or plastic?’ Back then, people also managed to get by without Ziploc® bags or dry cleaner bags. This was because the technology for creating polyethylene film didn’t emerge until the 1940s during World War II. And the methods to create plastic bags from polyethylene film weren’t developed until the 1950s. The most common way to produce poly bags is by blown film extrusion, also called the ‘tubular film process.’ In a moment, you’ll see how it got this name. Plastic bags are made from polyethylene. During processing, the polyethylene might be treated with any number of additives, such as…
With the increasing emphasis on utilizing the design/build method of delivery in the construction industry, and the desire to evaluate proposals using that old adage of ‘apples to apples’, it becomes incumbent upon the owner to create a specification which will insure that contractors have the appropriate information to propose the facility accurately…