Packaging Glossary

Retort CPP. A type of Cast Polypropylene film that is able to withstand the rigorous temperature and pressure conditions in retort process. RCPP can be boiled at 121°C for 30 minutes; high temperature RCPP can be boiled at 130°C.


Materials that are able to be used into new products to prevent waste of potentially useful materials, reduce the consumption of fresh raw materials, reduce energy usage, reduce air pollution (from incineration) and water pollution (from land filling) by reducing the need for “conventional” waste disposal, and lower greenhouse gas emissions as compared to virgin production.

Recyclable Symbol Code

The symbol code, a single digit ranging from 1 to 7 and surrounded by a triangle of arrows, was designed to allow consumers and recyclers to differentiate types of plastics while providing a uniform coding system for manufacturers. The easiest and most common plastics to recycle are made of polyethylene terephthalate (PETE) and are assigned the number 1. Items crafted from various combinations of the aforementioned plastics or from unique plastic formulations not commonly used. Usually imprinted with a number 7. These plastics are the most difficult to recycle and, as such, are seldom collected or recycled.


The use of a metal blade, formed to match a desired shape, to make a precision cut in paper or plastic. In flexible packaging, registration indicates the exact alignment of printing. It describes whether applied colours are in their exact correct position relative to one another.


The distance between two consecutive eye-marks. Repeat on packaging film usually indicates the length of the package that the machine will cutoff each time.

Retort Process

The thermal processing or cooking packaged food or other products in a pressurized vessel for purposes of sterilizing the contents to maintain freshness for extended storage times. Retort pouches are manufactured with materials suitable for the higher temperatures of the retort process, generally around 121°C.

Reverse Printing

The vast majority of all consumer is reverse printed. In this case, the outermost layer is printed on the back side and laminated to the rest of the multi-layer structure. While not mandatory in all industries, it is the preferred method for the food industry as it guarantees there will be no ink contact with the food product.

Rewind Direction

The film rewind direction has three basic elements. How the label feeds off the roll; inside or outside, the direction the length and width of the label comes off the roll, and finally the text and image direction on the labels itself.

Roto-gravure Cylinder

Cylinder is one of the two principal elements of Roto-gravure Printing. Plates for rotogravure are made of solid copper. Rotogravure cylinders consist of a steel mandrel on which a layer of copper has been deposited by electroplating.

Roto-gravure Printing

A method of printing using copper cylinders. With gravure printing, an image is etched on the surface of a copper cylinder. The etched area is filled with ink, then the plate is rotated on a cylinder that transfers the image to the film or other material. Gravure is abbreviated from Rotogravure.