Packaged Meat Buying Guide

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Guangzhou DaLong CNC Machinery Technology Co.Ltd is always following the saying: 'Quality is more important than quantity' to manufacture the packaged meat. For the purpose of providing a high quality product, we request third-party authorities to carry out the most demanding tests on this product. We guarantee that every product is equipped with qualified quality inspection label after being strictly checked.Customer Satisfaction is of central importance to DaLong Machine. We strive to deliver this through operational excellence and continual improvement. We track and analyze a variety of metrics to constantly improve our products, including customer satisfaction rate and referral rate. All these measures result in high sales volume and repurchase rate of our products, which make a contribution to our further progress and customers' business.Quality services offered at DaLong CNC Machine is a fundamental element of our business. We have adopted several methods to improve quality service at our business, from having clearly defined and measured service goals and motivating our employees, to utilizing customer feedback and updating our service tools to better serve our customers.
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The Right Chemistry: Dry Cleaning Research Led to Saran ...
Its a captivating story. Back in 1825, a careless maid in the employ of one Jean-Baptiste Jolly knocked over a turpentine lamp, spilling the liquid onto a stained tablecloth. Apparently, Jolly was a frugal man: turpentine, a liquid obtained by the distillation of pine tree resin, was a cheap alternative to whale oil, the common fuel for lamps. While Jolly may have been thrifty, he was astute. He noted that the stains vanished where the kerosene had soaked through the fabric. And at that moment the dry cleaning industry was born! At least so goes the possibly apocryphal tale.Dry cleaning is only dry in the sense that no water is used.Although Jolly is commonly credited with the discovery, a patent for dry scouring was actually filed in the United States by Thomas Jennings four years before the careless maid episode. Unfortunately, the patent was destroyed in a fire, so what solvent Jennings used isnt known, but it was likely either turpentine or a petroleum distillate. Jennings, the first African American to ever be granted a patent, became rich from his discovery and used his earnings to help fund the abolitionist movement.The great scourge of the dry cleaning industry was the flammability of the solvents. This was such a great problem that establishments had to be located away from populated areas. By the turn of the 20th century, the search was on for solvents that would dissolve stains and were not flammable.In 1933, Ralph Wiley was a college student working at the Dow Chemical Company in a lab where such research was being carried out. One of his jobs was cleaning glassware. One day he was confronted by a residue in a flask that defied all his cleaning efforts. No matter what he tried, a dark green greasy film remained. He brought this to the attention of his boss John Reilly who was intrigued but was too involved in other projects at the time. Eventually, when Wiley was hired by Dow as a chemist, the mysterious-material-in-the-flask project was resuscitated. Wiley and Reilly determined that molecules of vinylidene chloride, the chemical that was the focus of the dry cleaning solvent research, had combined with each other to form long chains of polyvinylidene chloride (PVDC).By 1943, the two chemists managed to work out a viable synthesis of this material and christened it Saran, combining Sarah and Ann, the first names of John Reillys daughter and wife. Saran turned out to be useful as a protective layer against salty sea spray for fighter planes on aircraft carriers, as an insole for military boots and as a stain-resistant coating on car upholstery. It was in 1953 that Saran hit the public spotlight after Dow had found a way to produce polyvinylidene chloride as a thin, clear film. Saran Wrap became an instant hit as a packaging material because it was impervious to oxygen and moisture, extending the shelf life of packaged food. Furthermore, when stretched, its coiled molecules would unravel and then attempt to spring back to their original shape resulting in the films ability to cling to itself and to other surfaces.In 2004, Saran Wrap, which had been acquired from Dow by S.C. Johnson & Son, underwent a dramatic change in formulation. Although the name was retained, the wrap was now made of polyethylene instead of polyvinylidene chloride. By the companys own admission, this was an inferior product with poorer barrier and cling properties. Why the change, thenIssues had arisen about the fate of plastics that contained chlorine, and PVDC had loads of it. When exposed to high temperatures, such as in an incinerator, chlorinated plastics were found to yield highly toxic dioxins, a problem does not arise with polyethylene.Polyethylenes greater permeability to gases is not necessarily a minus. For example, in the case of packaged meat, the passage of oxygen through the plastic allows for the formation of oxymyoglobin, which has the attractive red colour people associate with fresh meat. In the absence of oxygen, deoxymyoglobin has a dark purple colour. While packaging meat for a few days in polyethylene is fine, this thin plastic is not appropriate for freezing meat, since it will allow moisture to pass through, resulting in freezer burn. But polyethylene can be formulated as straight or branched chain polymers with different densities, strengths and permeabilities. Freezer bags combine different types of polyethylene to prevent freezer burn.It would be some sort of poetic justice if the plastic bags used by dry cleaners today were made of PVDC, since that plastic was spawned by dry cleaning research. But like Saran, they are made of polyethylene. Be sure to recycle them.
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