Cardboard Boxes: How they are manufactured and classified
HOW ARE CARDBOARD BOXES MADE? Cardboard boxes are made from corrugated cardboard, which is formed by joining several sheets of paper that are kept equidistant. By inserting one or more corrugated cardboard, which makes it a resistant and non-deformable material.
Each one of the leaves receives a name, thus the external ones are the covers or faces. The intermediate ones are the smooth faces, and the wavy ones are called wavy, filler or “medium”. Depending on whether they have one or several sheets joined together, the cardboard is known by:
- Single-sided boxes (single face–SF),
- Double-sided boxes, single channel or single channel. Recommended for light products or that fill the entire interior volume of the box and can be stacked (called load-bearing).
- Double-double or double channel boxes (DD), for greater protection of fragile, heavy or non-load-bearing products.
- Triple corrugated boxes, recommended for heavy loads, fragile goods, products for export, difficult to transport or to store for a long period of time.
The grammage of the papers and the height of the waves determine the consistency (ECT) and the resistance to vertical compression (BCT), which in turn determine the weight that can be supported by stacking.
HOW ARE CARDBOARD BOXES MEASURED?
Normally, in the description of each box model, the internal measurements appear in mm. such as length (L), width (B) and height (H).
In telescopic or variable-height cardboard boxes (those in which the height of the lid is adjustable, so that they perfectly fit the content for optimal packaging), there is a fourth measurement that measures the height of the lid (h ). For example: 355(L) x 205(B) x 120(H)/40(h).
For boxes with outer flaps, the length of the overlapping area (o) is also measured, for example: 355 (L) x 205 (B) x 120 (H)/40(o). Boxes with flaps offer greater resistance and protection of products and merchandise.
FAMILY MODELS 0200 – BOXES WITH FLAPS
These boxes are the most used cardboard boxes to transport and store merchandise and products due to their great resistance and protection of the content.
They belong to the slotted type boxes, which are those formed by a piece with glued, sewn or taped manufacturing joints, and upper and lower flaps.
FAMILY MODELS 0300 – TELESCOPIC BOXES
This family of boxes includes telescopic boxes made with more than one piece, since they have a lid and/or a bottom that slides over the body of the box.
Boxes with a central body and two lids for the top and bottom also belong to this family, which need to be glued or sewn, and are normally used in pallet boxes or in automated packaging systems.
FAMILY MODELS 0400 – ENVELOPES AND TRAYS
This family groups together folding boxes (envelopes) and trays, generally made from a single piece of corrugated cardboard and can incorporate closure elements, handles, panels, displays, etc. into the design. In these boxes the bottom is folded to form two or all of the side walls and the lid.
The most common use of these boxes is the transport and storage of flat or long products. We highlight the 0427 model for the extraordinary resistance it provides due to the fact that its walls are three pieces of cardboard without the need for sealing.
FAMILY MODELS 0500 – SLIDING BOXES
Includes slider-type boxes, which consist of several pieces of liners and sleeves that fit and slide in different directions into each other. Also includes outer end sleeves for other types of boxes.
Its use is for die-cut boxesfor books or large catalogs in small
FAMILY MODELS 0700 – READY TO USE BONDED BOXES
They are also sliding-type boxes with characteristics similar to the 0500 family. They differ in their glued closure base with a slit in the lid and pre-glued base flaps for dry assembly.
It also incorporates other boxes that are a quick and easy assembly solution, widely used in manual packaging lines.
FAMILY MODELS 0900 – INNER PACKAGING
They are also sliding-type boxes, but those of this family have several pieces of lining and covers that slide in different directions, one inside the other. This group also includes outer covers for other boxes.
To divide different layers of product inside the container, as well as internal dividers. To separate fragile products, and that also provide compressive strength to the box.