Cardboard Boxes, Kebet Corrugated Cartons, Storage Cartons, Storage Box, Melbourne, Australia

CARDBOARD


Corrugated cardboard is a composite material (paper and glue) constructed in such a manner as to increase the mechanical strength of the paper.

In all corrugated products there is at least one layer of corrugated paper - the medium; and at it's simplest one layer of paper - the liner.

Corrugated cardboard products are constructed in various forms and are classified as such:

Single Face Board

A. Single Face Board

Consists of one layer of corrugated material called the medium and one flat layer glued to and holding the medium in place and shape.

  • Flexible corrugated paper product
  • good for
    • general parceling, providing protection
    • flexible layer pads
    • wrapping of delicate parts
 
Single Wall Corrugated

B. Single Wall Corrugated

By adding another liner to the single face a rigid material is created with an inside liner usually made of totally recycled paper and an outside liner (varying in recycle from 0-100%). This has a better finish, which allows the paper to stretch when folded and provide a good substrate for printing. This board is used for most standard cartons.

  • Most common corrugated form (see board application)
  • Variable grades provide variable strengths (see board application)
 
Double Walled Corrugated<

C. Double Walled Corrugated

When a second layer of single face (usually of different flute) is added to the single wall board, then twin cushion or double wall corrugated cardboard is created. This material is for heavy duty cartons.

  • Good for heavy or delicate objects
  • Very robust
  • Thick walls
 
Triple Wall Corrugated

D. Triple Wall Corrugated

By adding a 3rd layer of single face Triple Wall (or tri wall) is created. This material is very specialised and used for a limited number of shipping cartons. It's price is usually too prohibitive, to be a practical carton material.

  • Good for heavy duty applications
    • Produce bins
    • Motors parts
  • Extremely rigid
  • Expensive
 
Duo Arch

E. Duo Arch

By doubling the corrugating medium on a single wall carton, Duo Arch is created. This gives the board a very rigid quality. It may be added into twin cushion board for extra strength. Duo Arch with single or double wall is usually associated with very heavy cartons.

 

Fluting Medium

In corrugated board, thickness of the material determines rigidity and stiffness. This is achieved by separating the outside layers with a corrugated medium to reduce weight and cost.

Fluting medium is actually a paper and its role in flat crush, edge compression and bulge resistance are all important factors when determining the performance of the board.

Performance is dependent on the type of flute and the fluting material.

For the most part the medium is made of one type of paper, usually in the region of 112gsm to 120gsm, but it can be bolstered by using a higher medium or creating a duo-arch.

 

Flutes

There are 4 regular flutes that Kebet uses in the manufacture of corrugated cartons i.e. A, B, C, & E Flutes.

A Flute

  • Approximately 5mm thick
  • Vertically strong
    • Stacking strength
  • Not a regular flute

B Flute

  • Approximately 2.5 mm thick
  • Good shape and profile retention
  • Excellent for
    • Diecut cartons
    • Small cartons
  • Regular flute

C Flute

  • Approximately 3.5 mm thick
  • Vertically strong
    • Stacking strength
  • Good for all general purpose applications
  • Regular flute

E Flute

  • Approximately 2mm thick
  • Good shape and profile retention
  • Acts like solid cardboard
  • Excellent for:
    • Diecut cartons
    • Small cartons
  • Not a regular flute

Flute

Thickness

Flutes per Metre
A 5.3 + 0.5 mm 110 to 120
B 2.8 + 0.5 mm 155 to 175
C 3.5 + 0.5 mm 130 to 140
E 2.0 + 0.5 mm 295 to 325

Twin Cushion Flutes

  • E/B Twin Cushion - approximately 4mm thick
    • Good shave and profile retention
    • Good vertical strength
    • Excellent for:
      • Fruit cartons
      • Small heavy duty cartons
    • Generally seasonal manufacture
  • B/C Twin Cushion - approximately 6mm thick
    • Good shape and profile retention
    • Good vertical strength
    • Excellent for:
      • Heavy duty cartons
  • Regular flute
  • A/C Twin Cushion - approximately 8mm thick
    • Good vertical strength
    • Excellent for:
      • Heavy duty cartons
      • Very heavy duty cartons
  • Regular flute

Other flutes (not handled by Kebet)

  • N flute - very tiny
    • Very large volume required
  • D flute - approximately 6 mm thick
    • not manufactured in Australia
  • Xitex - specialized twin cushion
    • .
B

B
C

C
A

A
 
 

Board Applications

5b / 5c

  • Fully recycled board
  • Lowest vertical strength factor
  • Good for general damage resistant products
  • Cheapest grade
  • Up to 1 - 2kg (depending on size)

4b / 4c

  • Mainly recycled material (up to 97%)
  • Good general quality for weight capacity to 8-10 kgs
  • Very common grade
  • Up to 5 - 8kg (depending on size)

3c / 3b

  • Good general all purpose board for product weight to 15kg
  • Recycle content from 50% to 100% (depending on manufacturer)
  • Common grade
  • Up to 10 - 12kg (depending on size)

1c / 1b

  • Good general all purpose board for product weight to 20kg
  • Recycle content from 0% to 70% (depending on manufacturer)
  • Common grade
  • Up to 20kg (depending on size)

1c / 1a Super

  • Heavy duty single corrugated
  • Recycle content 0% to 70% (depending on manufacturer)
  • Good for general heavy duty
  • Up to 20 - 25kg (Depending on size)
  • Requires volume for reasonable price

3T/C

  • Double walled heavy duty cardboard, good for product weight to 25-30 kgs
  • High recycle content
  • Good for heavy items; large items; fragile items
  • Most common heavy duty material

1T/C

  • Double walled heavy duty cardboard, good for product weight to 40 kgs
  • Low recycle content
  • Good for heavy items; large items; fragile items
  • Higher quality than 3T/C
  • Up to 35 - 50kg (depending on size)

HD700

  • Very high quality board
  • Very expensive
  • Made from almost virgin pulp
  • Good for very heavy items up to 100kg
  • High acid Hydro-kraft liner provides some water resistance
  • Up to 100kg (depending on size & style)