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  • Functional plastic packaging materials emerging as the times demand.
    Brief of plastic packaging materials in China: the plastic packaging materials are closely related to all kinds of products from industries to our daily lives. Because of their advantages of high performance, low cost and loss pollution, the plastic packaging materials are the kinds with fastest development and broadest applications among the current plastic products, making up at least a half of the total plastic products. It is reported that the domestic demand in 2005 will amount to 4,800,000 tons. The plastic packaging industry in China was still very weak in the 1980s’, and boomed in the 1990s. Within the 10 years from 1991 to 2001, the net increase on output amounted to 1,800,000 tons, symbolizing that the Chinese plastic packaging industry has entered a few stage of fast development. Besides, the continuous and cumulative increase on output has also shown that the plastic packaging industry is the rising sun in the field of plastic products.
    Functional packaging materials.
    The high-efficient, energy-saving and environmental plastic packaging materials are the current goal for manufacturers in such industry in the world, and the highly separated and multi-functional composite packaging materials processed with modern technology by wonderfully combining the functions of all kinds of materials have come into vogue rapidly. Such packaging materials can suit the different market demands, and realized the selective combination of different functions such as damp resistance, anti-oxygen, anti-carbon dioxide, aroma preservation, freshness preservation, sterilization, slow release, electrostatic resistance, high and low-temperature resistance, and anti aging.
    Separated packaging film.
    Structure of separated packaging film. Highly separated packaging materials are mostly used for foods. Today, the consumption of packaging films for various foods in China is 80t or so (about 50% of total packaging materials for foods). Because the application of separated packaging films can prolong the preservation period and shelf period of the foods, and keep the foods fresh during the storage, transportation and distribution, they have become the hot spot in the research and development of plastic packaging materials. The separated packaging films are usually compounded by multi-layer composite films, including the base resin (such as LDPE, LLDPE and PP), highly separated materials (such as EVOH, PA and PVDC) and binding resin (such as EVA and EAA). The highly separated packaging films commonly seen are of three layers and five layers, i.e., the three-layer packaging films composed of PA/binding agent/PE, EVOH/binding agent/PE, or PAJ/binding agent/PP, and five layer packaging films composed of LDPE/binding agent/EVOH /binding agent/LDPE, LDPE/binding agent/PA/binding agent/LDPE, or PP/binding agent/EVOH /binding agent/PP.
    It shall be noted that m-LLDPE has the superior features of narrow distribution of molecular weight, low hot seal temperature, high strength and strong anti-pierce performance. Therefore, adding a small amount of (such as 25%) m-LLDPE in LDPE or LLDPE can not only improve the physical and mechanical performances of LDPE and LLDPE, but also benefit the hot sealing and printing process. Some separating agent such as PA and EVOH are inapplicable for the inner layer of the multi-layer composite film because of their descending separation performance due to moisture absorption and poor hot seal performance.

    2011-12-17
    http://www.packaging-china.com/packaging-news-news-103.html
  • First, the history of plastic bottles:
    80 years of the 20th century, as China continued from abroad advanced production line of plastic bottles, opened with "plastic" on behalf of the "glass" the prelude, from plastic bottles to be used widely in packaging. Plastic bottles which are mainly non-toxic polymers such as high density polyethylene (HDPE), polyester (PET), polypropylene (PP), polycarbonate (PC) as the main raw material, the use of advanced plastic molding process and equipment for production of plastic bottles, mainly dressed all kinds of capsules, tablets, powders, granules, capsules, oral liquid, solid and liquid, etc..
    Second, the use of plastic bottles:
    Domestic market to sell drugs, dietary supplements, all food and drinks most of the use of plastic bottles, you casually stroll to the drugstore or supermarket, you can see the products packaged in plastic bottles. Medicines and nutritional healthcare products mainly used to polyester bottles (PET bottles) and high density polyethylene bottles (HDPE bottles), the major use of PET beverage bottles (PET), daily necessities such as shampoo, shower gel, use high-density polyethylene bottles (HDPE bottles) more. Plastic bottle features the largest light weight, unbreakable, clean, beautiful, and its large number of technical indicators and data show that its chemical resistance, excellent water vapor permeability of seals, which can be loaded entirely within the period of product safety shielding and protection products play a role.
    Third, the principle of selection of plastic bottles:
    l, no matter what material do choose plastic bottles, first of all must be consistent with non-toxic, no smell, etc., as the main raw materials for a wide variety of choice, which need to be selected combination of properties of raw materials, tablets usually use high-density polyethylene ethylene, polypropylene bottles, such as the need for transparency can be used PET bottles (PET bottles), if necessary, higher barrier properties, and stop light, opaque, brown PET bottles are used, the liquid formulations of drugs generally used in the polypropylene bottles or PET bottles as the main raw material. Currently the nutritional health products and food packaging PET bottles are mainly used for making fertilizer or HPDE, cap is PP material with
    2, bottle and cap sealing, water vapor permeability. Sealing and water vapor permeability of plastic bottles are two important technical indicators, they play the packaged products of crucial importance for the stability of the impact.
    3, plastic bottles product quality standards. From the production plant quality standards of product quality can be analyzed to judge the merits.
    4, the quality assurance system. Audit of the supplier purchase plastic bottles has become the essential part. Through the audit, can plant the software and hardware facilities, technical equipment, comprehensive level of quality to make a comprehensive assessment of the right.
    5, used for packaging drugs, dietary supplements, food and beverages must not use recycled materials issued by the Ministry of Health, "Plastic products and raw materials, food hygiene management measures," which clearly provides: "Where the processing of plastic utensils, containers, food packaging material, shall not use recycled plastic. "regulations is November 26, 1990 promulgated the.
    4, plastic bottles status
    Life everywhere plastic bottles, plastic bottles and is closely related to people's daily life, is none, I do not know something well-known everywhere in the. China also has a large base of plastic recycling, but the regulation does not regulate, good and bad times missing reference. In addition to a lot of plastic bottles made from recycled materials, production on people's health physical harm, there is pollution in the work en route, but also seriously endanger the health of consumers.
    Ministry of Health, "Plastic products and raw materials, food hygiene management measures," which clearly provides: "Where the processing of plastic utensils, containers, food packaging materials, shall not use recycled plastic." Recycling of waste plastics can be processed into other products. Many businesses now driven by the interests, tend to choose low-cost recovery of materials to manufacture products, it is indeed worrying. If you are using course there are impurities found in the bottle, transparent bottle of transparency is low, we should alert, and polish your eyes,

    2011-12-17
    http://www.packaging-china.com/packaging-news-news-88.html
  • Do you feel puzzled about how retail bags are made?Please take several minutes to read the passage below,then you will get the answer!
     
        Presentation & Retail bags are mainly made from high clarity polypropylene or cellophane. However, polypropylene have the advantage of being less expensive than cellophane (cello) bags.

       Polypropylene film is either made under BOPP (biaxially oriented PP) or Cast film extrusion process. The major portion of this is Biaxially Oriented PP (BOPP) film, however cast films are an important segment as well.

       Bi-Oriented Polypropylene (BOPP) refers to the manufacture of polypropylene films using an orienting system. BOPP films are manufactured using a tenter frame sequential process or the double bubble process, in which a polypropylene (PP) film is oriented in two directions (machine and transverse directions). BOPP films are typically used for packaging snacks, pasta, and confectionary goods, and as collation wrap for multi-packs.

      The main features of BOPP films are improved stiffness, high tensile strength, excellent optics and good water vapour barrier properties. BOPP films range from 15 to 50 microns and are most commonly 15 to 30 microns. BOPP films can be monolayer or co-extruded structures, and transparent, opaque, or metallized. The films use mainly homopolymer PP and random copolymer PP.
     
       The ca t film process involves the extrusion of polymers melted through a slot or flat die to form a thin, molten sheet or film. This film is "pinned" to the surface of a chill roll (typically water-cooled and chrome-plated) by a blast of air from an air knife or vacuum box. The film quenches immediately and then has its edges slit prior to winding.

       Cast film extrusion offers better gauge control and gauge consistency, which are critical for thin films below 1 mil (25 microns). Lastly, optical properties such as gloss and haze percentage are typically better for any given material when produced on cast film However, it has the disadvantage of higher scrap due to edge-trim, and very little film orientation in the cross-direction.
     
       Cast films are used in a variety of markets and applications, including stretch/cling films, personal care films, bakery films, and high clarity films.

    2011-12-17
    http://www.packaging-china.com/packaging-news-news-66.html
  • Innovative Australian juice range Preshafruit?, whose unique wedge shaped PET bottle and cap were designed and manufactured by VIP Packaging, has swept the field this month bringing home a raft of gongs from the prestigious Beverage Innovation Awards in Germany and Australian Packaging Awards in Melbourne.

    Closer to home, it took out silver in the Innovation category at the Australian Packaging Awards overnight.   Preshafruit? juices are pressurised cold (not heat pasteurised like most other juices) using a revolutionary technique called High Pressure Processing (HPP).
    Andrew Gibb, the Managing Director of Preshafood Limited says that the fruit is pressurised at approximately 6000 times the atmospheric pressure found at sea level. Gibb explains that this process promotes vitamin and nutrient retention, longer shelf-life, superior taste, colour and aroma and enables a myriad of opportunities in the food and beverage industry. 
    In order to maximise the yield from the HPP machine’s pressure vessel, the Preshafruit? manufacturing process required a unique bottle design. Daryl Black, PET Business Manager for VIP Packaging, says a number of design options were explored with the best solution coming from a triangular bottle.
    As a result, this created a unique packaging and merchandising opportunity with no other juice product in the market bottled in this kind of shape. Gibb says these wins are the result of a collaborative effort between designers, technologists and manufacturers to deliver a truly innovative product to the market. The unique triangular bottle really sets it apart from other offerings in the supermarket juice aisle, he says.

    "This product is a stand out on the supermarket shelves because of our unique packaging, the all important 100% Australian fruit and the critical components of no added concentrates, sweeteners, colours or preservatives," Gibb says. 
    The judges from the Beverage Innovation Awards in Germany said the bottle immediately gives the product a super-premium feel and the whole presentation, including the sophisticated labelling and unique closure, gives consumers plenty of clues as to just how good these drinks taste.
    First purchase is pretty much assured through the packaging innovation, repeat purchase is guaranteed through a really great tasting and refreshing drinking experience.
    Made on conventional two-stage PET equipment using conventional PET performs, Black says processing parameters were developed to allow for production of the unique triangular shape.
    According to Preshafood Limited, it is the first company in Australia to use HPP, not heat pasteurisation, to create its fruit juices and is the first company in the world to make single variety juices such as Granny Smith and Pink Lady Apple, using this method of production.

    News source:Packaging

    2011-12-17
    http://www.packaging-china.com/packaging-news-news-47.html
    1. Low density polythene (LDPE): Ethylene polymer with densities ranging from about 0.916 to 0.925 grams per cubic centimeter
    2. High density polythene (HDPE): Ethylene polymer with densities ranging from 0.941 to 0.965 grams per cubic centimeter
    3. Liner low density polythene (LLDPE): Ethylene polymer with densities ranging from 0.900 to 0.939 grams per cubic centimeter
    4. Medium density polyethylene (MDPE): Ethylene polymer with densities ranging from 0.926 to 0.940 grams per cubic centimeter
    5. Polypropylene (PP): A thermoplastic resin made by the polymerization of high-purity propylene gas in the presence of catalyst at relatively low pressures and temperatures. It is used to make film, fibers, rope and moulded articles
    6. Ethylene Vinyl Acetate (EVA): EVA compounded with LDPE is widely used to prevent plastic film/bags from cracking down to -30 degrees centigrade
    7. Polyvinyl chloride (PVC): Thermoplastic resin produced by the polymerization of the gas vinyl chloride [CH2CHCl]. Used in soft, flexible films for food packing. Also used in rigid products such as pipes or window profile.
       
    2011-12-17
    http://www.packaging-china.com/packaging-news-news-11.html
  • Other plastics emerged in the prewar period, though some wouldn't come into widespread use until after the war.

    By 1936, American, British, and German companies were producing "polymethyl methacrylate" (PMMA), better known as "acrylic."  Although acrylics are now well-known for the use in paints and synthetic fibers, such as "fake furs," in their bulk form they are actually very hard and more transparent than glass, and are sold as glass replacements under trade names such as "plexiglas" and "lucite."  Plexiglas was used to build aircraft canopies during the war, and it is also now used as a marble replacement for countertops.

    Another important plastic, polyethylene (sometimes known as "polythene") was discovered in 1933 by Reginald Gibson and Eric Fawcett at the British industrial giant Imperial Chemical Industries (ICI).  This material evolved into two forms, low density polyethylene (LDPE) and high density polyethylene (HDPE).

    Polyethylene is cheap, flexible, durable, and chemically resistant.  LDPE is used to make films and packaging materials, including plastic bags, while HDPE is used more often to make containers, plumbing, and automotive fittings.  While PE has low resistance to chemical attack, it was found later that a PE container could be made much more robust by exposing it to fluorine gas, which modified the surface layer of the container into the much tougher "polyfluoroethylene."

    Polyethylene would lead, after the war, to another material, "polypropylene" (PP), which was discovered in the early 1950s.  It is common in modern science and technology that the growth of the general body of knowledge can lead to the same inventions in different places at about the same time, but polypropylene was an extreme case of this phenomenon, being separately invented about nine times.  It was a patent attorney's dream scenario, and litigation wasn't resolved until 1989.

    Polypropylene managed to survive the legal process, and two American chemists working for Phillips Petroleum of the Netherlands, Paul Hogan and Robert Banks, are now generally credited as the "official" inventors of the material.  Polypropylene is similar to its ancestor, polyethylene, and shares polyethylene's low cost, but it is much more robust.  It is used in everything from plastic bottles to carpets to plastic furniture, and is very heavily used in automobiles.

    Polyurethane was invented by Friedrich Bayer & Company of Germany in 1937.  It would come into use, after the war, in blown form for mattresses, furniture padding, and thermal insulation.  It is also used in non-blown form for sports wear such as "lycra."

    In 1939, I.G. Farben Industrie of Germany filed a patent for "polyepoxide" or "epoxy."  Epoxies are a class of thermoset plastics that form cross-links and "cure" when a catalyzing agent, or "hardener," is added.  After the war, they would come into wide use for coatings, "super glues," and composite materials.

    Composites using epoxy as a matrix include "fiberglass," where the structural element is glass fiber, and "carbon-epoxy composites," in which the structural element is carbon fiber.  Fiberglass is now often used to build sport boats, and carbon-epoxy composites are an increasingly important structural element in aircraft, as they are lightweight, strong, and heat-resistant.

    Two chemists named Rex Whinfield and James Dickson, working at a small English company with the quaint name of the "Calico Printer's Association" in Manchester, developed "polyethylene terephthalate" (PET or PETE) in 1941.  It would be used for synthetic fibers in the postwar era, with names such as "polyester," "dacron," and "terylene."

    PET is more impermeable than other low-cost plastics and so is a popular material for making bottles for Coke and other "fizzy drinks," since carbonation tends to attack other plastics, and for acidic drinks such as fruit or vegetable juices.  PET is also strong and abrasion resistant, and is used for making mechanical parts, food trays, and other items that have to endure abuse. PET films, trade-named "mylar," are used to make recording tape.

    One of the most impressive plastics used in the war, and a top secret, was "polytetrafluoroethylene" (PTFE), better known as "teflon," which could be deposited on metal surfaces as a scratchproof and corrosion-resistant, low-friction protective coating.  The polyfluoroethylene surface layer created by exposing a polyethylene container to fluorine gas is very similar to teflon.

    A Du Pont chemist name Roy Plunkett discovered teflon by accident in 1938.  During the war, it was used in gaseous-diffusion processes to refine uranium for the atomic bomb, as the process was highly corrosive.  By the early 1960s, teflon "non-stick" frying pans were a hot consumer item.

    Teflon was later used to synthesize the miracle fabric "GoreTex," which can be used to build raingear that in principle "breathes" to keep the wearer's moisture from building up.  GoreTex is also used for surgical implants; teflon strand is used to make dental floss; and teflon mixed with fluorine compounds is used to make "decoy" flares dropped by aircraft to distract heat-seeking missiles.

    After the war, the new plastics that had been developed entered the consumer mainstream in a flood.  New manufacturing was developed, using various forming, molding, casting, and extrusion processes, to churn out plastic products in vast quantities.  American consumers enthusiastically adopted the endless range of colorful, cheap, and durable plastic gimmicks being produced for new suburban home life.

    One of the most visible parts of this plastics invasion was Earl Tupper's "tupperware," a complete line of sealable polyethylene food containers that Tupper cleverly promoted through a network of housewives who sold Tupperware as a means of bringing in some money.  The Tupperware line of products was well thought out and highly effective, greatly reducing spoilage of foods in storage.  Thin-film "plastic wrap" that could be purchased in rolls also helped keep food fresh.

    Another prominent element in 1950s homes was "formica," a plastic laminate that was used to surface furniture and cabinetry.  Formica was durable and attractive.  It was particularly useful in kitchens, as it did not absorb, and could be easily cleaned of stains from food preparation, such as blood or grease.  With formica, a very attractive and well-built table could be built using low-cost and lightweight plywood with formica covering, rather than expensive and heavy hardwoods like oak or mahogany.

    Composite materials like fiberglass came into use for building boats and, in some cases, cars.  Polyurethane foam was used to fill mattresses, and styrofoam was used to line ice coolers and make float toys.

    Plastics continue to be improved.  General Electric introduced "lexan," a high-impact "polycarbonate" plastic, in the 1970s.  Du Pont developed "kevlar," an extremely strong synthetic fiber that was best-known for its use in bullet-proof vests and combat helmets.  Kevlar was so remarkable that Du Pont officials actually had to release statements to deny rumors that the company had received the recipe for it from space aliens.

    One of the most potentially important new developments in plastics is circuits made out of plastics called conductive polymers.  Electronic circuitry fabricated using plastics or other materials that could be simply printed on a substrate could be incredibly cheap, opening the door to throwaway electronic devices that would cost pennies, or to applications hardly dreamed of now.

    So far, electronic devices made with such materials have not been acceptable for production but, in 2001, prototypes of flat-panel displays based on such technologies were being publicly demonstrated, with predictions of commercial introduction in two or three years.

    2011-12-17
    http://www.packaging-china.com/packaging-news-news-6.html
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