Easy peel film is heat sealable, comprising a sealant layer which readily and easily delaminates or peels from a second adjacent film layer or plastic container after being heat sealed. Easy peel film can be used independently as a sealable packaging film, or laminated to a second film structure wherein the second film structure may comprise a single layer or multiple layers. Easy peel film are widely used as the lidding film for rigid containers.
A test to measure the ductility of a flexible material. When a material is tested for tensile strength, it elongates to a certain extent before fracture takes place. The two pieces are placed together and the amount of extension is measured against marks made before the test and is expressed as a percentage of the original gauge length.
Ethylene-Vinyl Acetate copolymer. Much softer and clearer than LDPE or LLDPE and has lower melting temperature. Its melting temperature goes down, while its softness increases with increasing vinyl acetate (VA) content. EVA resins with 2-18% VA content are used for cast and blown packaging films.
Ethylene-Vinyl Alcohol copolymer, used in coextruded plastic films to improve oxygen barrier properties. It is, however, a poor water vapor barrier. EVOH is commonly used in laminated film with PET & NY to gain extra moisture barrier. Its OTR also depends on its VOH (vinyl alcohol) content.
A laminating process in which several 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.
A machine-recognizable mark, printed on web-fed packaging materials. The eye-mark is the reference point from which the machine will register other operations such as further decoration, heat sealing, or package cutoff.
A type of seal resulting from sealing together the contiguous edge areas of two sheets, usually by heat, resulting in a finlike protuberance.
An injection molded “Spout or Valve” that is typically heat-sealed to a flexible packaging material.
Flexo Printing (Flexography)
A method of printing using flexible rubber or photopolymer printing plates in which the image to be printed stands out in relief. Fluid ink metered by an engraved roll is applied to the raised portions of the printing plate and then transferred to the substrate. Flexographic printing is used to print sheets of preformed corrugated board and for printing roll-fed plastics and papers.
A thin layer of aluminum foil (0.23~0.33 mils) is used in film lamination process to enhance oxygen, moisture and sunlight barrier.
Four Process Color
The four process colors (cyan, magenta, yellow and black) are also referred to as CMYK. However it is a myth that every image can be duplicated using the “four process colors.” Additional ‘spot’ colors are often required to generate the high resolution images that are most preferred in modern packaging.