Pacific Container Corp.

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Pacific Container — Box Basics

Basic information about varying styles, strengths and measurements of corrugated cardboard boxes.

Corrugated Board

Corrugated board has two main components, the linerboard and the medium. Linerboard is the flat pieces that make up both sides of the corrugated. Medium is the wavy, fluted paper in between the liners. The wavy flutes provide arches when horizontal and columns when vertical. The arches and columns help provide strength and support when holding heavy loads. The two primary types of combined linerboard that we use are Singlewall and Doublewall.

Box Basics - Corrugated Board Boxes - Pacific Container Corp.

Combining two liners with one sheet of medium produces Singlewall. Double wall combines three liners and two sheets of medium.

Styles of Corrugated Board Boxes

Pacific Container Corp. - Box Basics
RSC — Regular Slotted Container

This is the most commonly produced container style. All flaps have the same length, with the outer (usually the length flaps) meeting at the center of the box when folded.

Pacific Container Corp. - Box Basics
FOL — Full Overlap Container

This style has flaps that are equal to the width of the box and fully overlap the top and bottom. This style is especially resistant to rough handling and is an excellent option for an end-loaded carton.

Pacific Container Corp. - Box Basics
HSC — Half Slotted Container

Same as Regular Slotted Container without one set of flaps.

Pacific Container Corp. - Box Basics
OPF — One Piece Folder

This is a single piece of board that creates a wrap for the product. The sides and ends are formed with flaps with the side flaps meeting in the middle.

Pacific Container Corp. - Box Basics
FPF — Five Panel Folder

A single piece that features a fifth panel that is used as a closing flap. The packaged box features several layers of corrugated on each end providing additional protection.

Pacific Container Corp. - Box Basics
D/S Tray — Design Style Trays

Two telescoping pieces that fit over each other to form a box.

Pacific Container Corp. - Box Basics
Die Cut Mailer

This style utilizes self-locking roll ends. They may feature perforated rolls, vent holes, or similar custom options.

Pacific Container Corp. - Box Basics
Die Cut Tray

This style utilizes self-locking roll ends. They may feature perforated rolls, vent holes, or similar custom options.

Pacific Container Corp. - Box Basics
Partition

Used as inner packaging pieces to separate spaces within a container.

Pacific Container Corp. - Box Basics - Measuring Corrugated Cardboard BoxesHow to Measure a Box

Box makers prefer the dimensions of a box to be expressed and measured as inside dimensions. Accurately measuring the inside of the box is very important to ensure that the proper fit is created.

The dimensions are listed as Length x Width x Depth. The length is defined as the longer side of the opening. The width is the shorter side of the opening. The depth runs perpendicular to the length and width and is also the height of the carton.

Determining the best Edge Crush Test (ECT) for your application

Determining the appropriate material grade is an important part of the design process. Our team of Sales people and structural engineer can assist in developing the most effective and efficient material grade for your application.

The following chart provides us with the requirements of the National Motor Freight regulations:

Edge Crush Values:

Maximum Weight of Box & Contents (lbs.) Maximum Outside Dimensions: Length, Width and Depth Added (inches) Minimum Edge Crush Test
Single Wall Corrugated Fiberboard Boxes
20 40 23
35 50 26
50 60 29
65 75 32
80 85 40
95 95 44
120 105 55
Double Wall Corrugated Fiberboard Boxes
80 85 42
100 95 48
120 105 51
140 110 61
160 115 71
180 120 82


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