Composite paper is paper that is processed together with other packaging materials such as plastics and metals, which aims to improve the brittle force, stiffness and strength of the material. Paper mixed with metal and formed into cans called composite cans, used for citric juice, spice containers (spices), chocolate boxes, dry soups, chemicals and medicines. The packing industry has made composite cans that can withstand vacuum and withstand temperatures of about 49 o C, so it can be used for preserving jam (jam). Tube carton is used for margarine and ice cream.
There are 3 (three) types of construction of composite paper cans, namely: spiral shape, sewing lobe ( lap seam ) and compound roll ( convolute ). The spiral shape consists of several layers of different materials with an overlapping connection angle. The composite lobe body is sewn, made of laminated material, while the composite type of roll consists of several layers of coils. The carton tube is a tube-shaped package of cardboard or paper. The larger tube shape is called the carton drum.
Tube cartons are widely used for packing chips, while drum cartons are used for powdered materials or dried products. For packing of liquid material then carton packing coated with plastic. The advantages of composite tubes and cartons are light weight, easy to open and close, can be re-coated with other materials so as to be water-resistant. Usually made in the form of folding / cardboard folding folds made of duplex material and the like, the thickness of the duplex is adjusted to the weight of the product content or thickness as well as its own attraction.
With the development of packaging technology, cardboard packaging has good moisture resistance and can be designed according to the nature of fresh fruit. The technology is adopted from the packaging technology of seafood products. Packaging from local materials made of paper remains in good condition even though placed in a room with moisture up to 80% (Trubusid, 2008). Based on the dimensions of the grooves, flat cardboard sections, and the number of plots, corrugated cartons are divided into several types, namely (International Trade Center UNCTAD / WTO 1993) .:
- · The carton is not flat
- · One-faced carton,
- · Single wall double wallboard,
- Double wall double wallboard,
- Three double-wall double-walled cartons
More than 90% of the corrugated cardboard packaging produced is a single wall double carton type. Double wall double walls are commonly used to pack heavy items, especially for exports, while double wall triple cartons are used for packing very heavy industrial items. Based on the construction, there are several types of corrugated cardboard packaging, namely:
- · Type of cut printing,
- · Type bliss
- · Type one-piece box
- · Lock type
- · Type of telescope
The most widely used type of corrugated cardboard packaging is the type of onepiece box with regular slotted container (RSC) type . This type has the same length cap and meets in the middle when closing. According to the International Trade Center UNCTAD / WTO (1993), the RSC type is the most economical because the materials used are minimal but the maximum volume is (Figure 36).
Figure 36. Some Kinds of Corrugated Carton
a) Single wall,
b) Double walls, and
c) Three walls