Packaging

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FAQ Packaging

1. What is Flexible Packaging?
A Package or container made of flexible or easily yielding materials that, when filled & closed, can be     readily changed in shape. Normally applies to bags, envelopes, pouches or wraps made of materials ranging in thickness from 13 to 76 micrometers (0.0005 to 0.003 inch), such as paper, plastic films, foils, or combination of these.
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2. What is a Gravure Printing?
A method of printing that uses cells edged or engraved into the surface of a metal cylinder to meter and correctly pattern the ink. Gravure printing presses used in packaging are predominantly roll fed.
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3. What is Reverse Printing?
Printing on the reverse side of transparent film so that the printing will be on the inside of the package and will be observed through the film. Reverse printed films are usually laminated so that the printing is locked between the two piles. Reverse printing takes advantage of the glossy exterior surface of the printed film.
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4. What do the following abbreviations stand for?
OPP= Oriented polypropylene
BOPP= Bi-axially Oriented polypropylene
MOPP= Metalized Oriented polypropylene
CPP= Cast polypropylene
MCPP= Metalized cast polypropylene
PP= Polypropylene.
LDPE= Low Density Polyethylene
LLDPE= Linear Low Density Polyethylene
HDPE= High Density Polyethylene
BOPET= Bi-axially oriented Polyester
Al-Foil = Aluminum Foil
PVC= Poly vinyl chloride
PA=Poly amide (nylon)
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5. What is Extrusion?
The process of forming a thermoplastic by forcing the polymer melts through a shaped orifice. The extruded plastic is immediately chilled, and the resulting shape would be in the profile of the extrusion die.
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6. What is Co-Extrusion (Co-ex)?
The extrusion of two materials simultaneously from a single die in such a way that the two separate materials fuse together to form a single structure. The two materials still retain their individual properties except for the immediate contact area.
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7. What is Blown-Film Extrusion?
The manufacture of thin plastic films by extruding a bubble of plastic and then inflating the bubble. In film manufacturing the extrusion and inflation are a continuous process.
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8. What is Cast-Film Extrusion?
A film that is extruded in a thin curtain from a slotted die and then cooled and solidified by being passed over a chilled roll.
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9. What is a Laminate?
A material composed of two or more layers of different materials, joined together to make a single sheet. The component layers may be applied coatings or other sheet materials bonded to the base material with adhesive substances.
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10 What is an Adhesive?
A substance that can be used to join two surfaces. A typical adhesive is a liquid capable of forming molecular attractions to (wetting) the substrates and then solidifying by evaporation of volatile   Cooling, or chemical reaction.
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11. What Is Solvent less or Dry-bond lamination?
A lamination method where two substrates that are not readily permeable to adhesive solvent vapors are joined. An adhesive is applied to one substrate, and then the coated surface is dried of all volatiles. Depending on the adhesive formulation, the remaining adhesive solids will be tacky or can be made so by nipping the substrates against a heated combining roll.
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12. What is Solvent based or Wet-bond lamination?
A lamination method in which an applied adhesive, including any volatile solvents or ingredients, is pressed between the two substrates to be laminated. Since the adhesive contains volatiles that must be allowed to escape, at least one of the laminate materials must be porous.
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13. What is a Barrier?
The ability to stop or retard the movement of one substance through another. In packaging, the term is most commonly used to describe the ability of a material to stop or retard the passage of atmospheric gases, water vapor, and volatile flavor and aroma ingredients.
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14. What Is Cold Seal?
A seal produce by an adhesive that adheres only to itself and requires only contact pressure to bond.
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15. What is Heat Seal?
A method of joining two surfaces by heat- fusing them or their coatings together. The quality of the seal is determined by the sealed substances, time, temperature, and pressure.
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16. What is Yield?
The amount of product that can be produced from a given weight of material. Most packaging raw materials are sold by weight. However, because of density differences, the same weight of similar materials can produce different amounts of finished product. The yield may be expressed in terms of volume per unit weight, or the actual number of physical objects per unit weight. 
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17. What is Pantone Matching System (PMS)?
The commercial color specifying system commonly used in graphic arts. Pantone Inc. produces books containing color swatches printed on selective substrates. Each color is identified by a number code. Designer can reference the number when calling up different colors during discussions with customers, printers, and ink producers.
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18. What Is Eye-mark?
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 decorations, heat sealing, or package cut-off.