Call Us: (310) 515-9898 - Email: sales@ewpackaging.com

GLOSSARY

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Office Hours:

Monday - Friday

7:30am - 4:00pm (PST)


Shipping and Receiving Hours:

7:30am - 3:00pm (PST)

    17510 S Broadway Street #B
    Gardena, CA 90248
    Telephone: (310) 515-9898

    Fax: (310) 515-9897

    Email: sales@ewpackaging.com

    Blister Packs – It is commonly used as unit-dose packaging for pharmaceutical tablets, capsules or gels. Blister packs can provide barrier protection for shelf life requirements, and a degree of tamper resistance. Blister packs are created by means of a form-fill-seal process at the pharmaceutical company or contract packer. Blister packs consist of two principal components : 1) a formed base web creating the cavity inside which the product fits and 2) the lidding foil for dispensing the product out of the pack. There are two types of forming the cavity into a base web sheet: thermoforming and cold forming.


    Biaxially Oriented Polypropylene (BOPP) – Orientation of plastic films in both machine and cross machine directions by stretching. Properties of biaxially stretched films are generally well balanced in both directions.


    Extrusion Lamination – A laminating process in which individual layers of multi-layer packaging materials are laminated to each other by extruding a thin layer of molten synthetic resin (such as polyethylene) between the layers.


    Flexography – A printing process using a raised surface on a flexible plate, often made of a rubber-like material, mounted on a rotary letterpress. Flexographic inks are very thin, watery inks that dry very quickly. The flexible plate makes it possible to print on irregular surfaces such as aluminum cans, coffee mugs, or corrugated cardboard


    High Density Polyethylene (HDPE) – A plastic material whose thickness ranges from .941 -.965 g/cm3. HDPE is more expensive to process, but maintains greater strength, resistance and stiffness than either LDPE or LLDPE.


    Laminating Film – Most thermal laminating film consists of two layers: a base layer of polyester and an adhesive layer of polyethylene. The polyester layer forms the harder outer surface of the film and does not melt at laminating temperature. It provides rigidity and protection for your laminated items. The greater the polyester content, the higher the level of protection, rigidity and luster. The polyethylene layer melts at laminating temperature and bonds the film onto the subject material under the pressure of the laminating rollers.


    Linear Low Density Polyethylene (LLDPE) – A plastic material that is produced at lower temperatures and pressures than LDPE through copolymerization, resulting in a crystalline structure responsible for greater stiffness and a higher melting point than LDPE. Although it is more difficult to process, LLDPE maintains greater tensile strength and a greater resistance to stress cracking than LDPE.


    Lithography – the art or process of chemical-printing from a flat stone or metal plate by a method based on the repulsion between grease and water. The design is put on the stone surface with a greasy material, and then water and printing ink are successively applied; the greasy parts, which repel water, absorb the ink, but the wet parts do not.


    Low Density Polyethylene (LDPE) – The most common and least expensive plastic bag material that maintains a density of .910-.925 g/cm3. LDPE maintains its durability, flexibility, water resistance and clarity under low temperatures, and its low melting point makes it ideal for heat sealing.


    MET-OPP – Metalized OPP film. It has all the good properties of OPP film, plus much improved oxygen and water vapor barrier properties, (but not as good as MET-PET).


    MET-PET – Metalized PET film. It has all the good properties of PET film, plus much improved oxygen and water vapor barrier properties. However, it is not transparent.


    Nylon (NY) – Polyamide resins, with very high melting points, excellent clarity and stiffness. Two types are used for films: nylon-6 and nylon-66. The latter has much higher melt temperature, thus better temperature resistance, but the former is easier to process, and it is cheaper. Both have good oxygen and aroma barrier properties, but they are poor barriers to water vapor.


    Offset Lithography – In Direct Lithography, an image in reverse is printed onto the paper directly, creating a positive image. In Offset Lithography, a positive image is transferred to a rubber-covered cylinder (reversing the image), and then transferred to the paper leaving a positive image.


    Oriented Polypropylene (OPP) – A stiff, high clarity film, but not heat sealable. Usually combined with other films, (such as LDPE) for heat sealed. Can be coated with PVDC (polyvinylidene chloride), or metalized for much improved barrier properties.


     

    Polyethylene (PE) – The most common plastic resin, it is a light, chemically resistant thermoplastic used in packaging and insulation. PE resins used in the production of plastic bags include low density, linear low density and high density resins.


    Polyester / Polyethylene Terephtalate (PET) – Tough, temperature resistant polymer. Biaxially oriented PET film is used in laminates for packaging, where it provides strength, stiffness and temperature resistance. It is usually combined with other films for heat seal and improved barrier properties.


    Polypropylene (PP) – Light, durable thermoplastic with a high melting point that is often used in packaging. PP contains polymers consisting of propylene, a colorless, combustible gas found in petroleum. 


    Polyvinyl Chloride (PVC) – Polyvinyl chloride. A tough, stiff, very clear film. The oriented version is used mainly for shrink film applications.


    Process Color – A reproduction of color, made by means of photographic separations. Yellow, Red (magenta) and Cyan (blue- green) are the three process colors, which, when combined, can make black and various shades of thousands of colors, with a minimum of photography or plate work. Color copiers work on this principle.


    PVC Shrink Film – Polyvinyl chloride shrink film. Shrink percentages vary from about 40% for extruded PVC shrink tubing to over 60% for seamed material. The most cost-effective shrink film for full-body shrink sleeves.


    Resin – A class of polymers, or plastics, chemically different to naturally occurring resin, a sticky substance obtained from certain trees and plants. Examples of resins include polyethylene, polyurethane and acrylics.


    Rotogravure – a high quality process capable of producing printed images having a continuous tone effect, similar to that of a photograph. The high quality is achieved by the transfer of ink from cells of various sizes and depths that are etched into a copper covered steel cylinder. The various sizes and depths of the depressions create the different densities of the image. The areas of the cylinder that are not etched become the non-image areas. The image areas of a typical rotogravure cylinder contain thousands of cells per square inch. The cylinder can be created with analog or digital plating processes. Rotary gravure presses are the fastest and widest presses in operation, printing everything from narrow labels to 12-feet-wide rolls of vinyl flooring.


    Side-Gusset Bag – A bag with gussets on both sides, with a fin-seal running from top to bottom and sealed horizontally at the bottom and the top.


    UV (ultra violet) Film – The film has UV inhibitors to prevent film deterioration in sunlight and protect colors in the laminated material from fading. This will not prevent color such as red from eventually fading if in direct sunlight.

    There is a huge variety of thermal laminating films available to suit many different kinds of application. Here are some of the more commonly used "special" film types of film additives:

    • Film with low-melt adhesives; these often have better clarity and are less likely to curl or ripple when laminating conditions are not ideal - often called copolymer.
    • Matte surfaces to eliminate glare, or matte surfaces that will accept printing or writing; many suppliers offer films with both glossy and matte (non-glare finishes).
    • Film with UV inhibitors to prevent film deterioration in sunlight and protect colors in the laminated material from fading.
    • Opaque or colored films for the back side of a lamination; these can form a   border for a laminating piece.
    • Iridescent clear films for special visual effects.
    • Permanently waterproof films for outdoor, underwater or special applications; the most common thermal laminating films are made with water-based primers and will eventually de-laminated if continually exposed to water or weather; truly waterproof films are made with special printers.

      Zipper Bag – A flexible package produced with a plastic track in which two plastic components interlock to provide a mechanism that allows for a resealable pouch.
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