corrugated fiber board boxes
TRANSCRIPT
CORRUGATED FIBRE BOARD - (CFB) Packaging
Corrugated Fiber Board (C.F.B.) packaging is a versatile, economic, light, robust,
recyclable, practical and yet dynamic form of packaging. Corrugated fiber board
packaging offers almost unlimited possible combinations of board types, flute sizes,
paper weights, adhesive types, treatments and coatings. Corrugated fiber board is
routinely; custom designed to meet specific customer requirements. Corrugated Fiber
Board is made from papers made up from cellulose fibres, which are virgin or
recycled. This makes Corrugated Fiber Board a renewable natural resource.
Corrugated Board is made from a combination of two sheets of paper called liners
glued to a corrugated inner medium called the fluting. These three layers of paper
are assembled in a way which gives the overall structure a better strength than that
of each distinct layer.
Components of C.F.B.: C.F.B. has three components which are as follows:
Liner
Fluting Medium
Adhesive
Liner: Kraft paper of above 80 gsm to 250 gsm is used for making liner. Preferably
outer most liner used for box should be of the maximum grammage.
Functions of Liner:
a. Resist hazards like puncture, burst, abrasion, tear etc.
b. Properly hold the fluting medium when once combined.
c. Resist moisture or water either outside or inside depending on the nature of
product packed.
d. Be amenable to printing.
Waterproof paper such as bitumen, sandwiched, poly-coated or wax coated are also
used for liner.
Types of Flutes: Flutes come in several standard shapes or flute profiles (A, B, C, E,
F etc.) A-flute was the first to be developed and is the largest common flute profile.
B-flute was next and is much smaller. C-flute followed and is between A and B in
size. E-flute is smaller than B and F-flute is smaller yet. Table (1) gives a comparison
of various flutes with respect to Flute height and corrugation per meter.
Table (1): Comparison between various Flutes
Flute Corrugations/
Flutes Per Meter
Flute Height
(Mm)
High - A Flute 30 +/- 2 5.6
Jumbo A Flute 20 7.00
A – Flute (Broad) 105 TO 125 4.5 TO 4.7
B – Flute (Narrow) 150 TO 185 2.1 TO 2.9
C – Flute (Medium) 120 TO 145 3.5 TO 3.7
E – Flute (Micro) 200 TO 320 1.1 TO 1.5
F – Flute 124 +/- 4 0.8
G - Flute 178 +/- 4 0.5
K - Flute 25 +/- 1 6.6
Characteristics of Various Flute:
A Flute:
High top to bottom compression
Good stacking strength
Excellent cushioning for product protection
C Flute :
Good printing surface
Good top to bottom compression
Good resistance to flat crush
B Flute:
High resistance to flat crush
Excellent printing surface
Scores and slots easily
Adapts well to automatic equipment
E Flute:
High resistance to flat crush
Outstanding printing surface
Mostly used for consumer goods shelf packaging
F Flute:
Good alternative to paperboard applications
Superior printing surface
High resistance to flat crush (Similar to E)
Consumer goods shelf packaging (most applicable)
Functions of Fluting Medium
Provides necessary cushioning desired.
Provides rigidity to the board.
Contributes to resistance to bending under stress particularly after
converting into a box.
The grammage of fluting medium may be in the region of 80-250 gsm.
Adhesive
While kraft paper is the main raw material for corrugated packaging industries,
adhesive – as the second most important material has gained significance
importance. Usually starch based adhesives are used for joining the outer liner
(This has relation to printing) Sodium Silicate (near to natural) also is used. The
silicate can give a rigid board but they can render the box brittle or lend to de-
lamination depending upon the humidity.
Types of Corrugated Board
Corrugated board consists of one or two outer plies, the flutes and, in multi-ply types
of corrugated board, of 3 or more intermediate plies. Corrugated board is classified
as follows according to the number of outer/intermediate plies and flutes:
Single face/Two ply Corrugated Board
Single face corrugated board consists of one ply of fluted paper, onto which paper or
cardboard is glued.
Single Wall/3-Ply Corrugated Board
Single wall (double face/3-Ply) corrugated board consists of one ply of fluted paper
which is glued between two plies of paper or cardboard.
Double Wall /5-Ply Corrugated Board
Double wall/5-Ply corrugated board consists of two plies of fluted paper which are
glued together by one ply of un-fluted paper or cardboard and the exposed outer
surfaces of which are each covered with one ply of paper or cardboard.
7-Ply Corrugated Board
Tri-wall corrugated board consists of three plies of fluted paper which are glued
together by two plies of paper or cardboard and the outer surfaces of which are
likewise each covered with one ply of paper or cardboard.
Advantages of C.F.B
Effective cushioning material
Easy to fabricate
Easy to storing
Easy to disposal
More pilfer proof
No strapping necessary
Safe for human handling
Articles can be kept dust free after sealing
Could be specially made water resistance
Printing and advertising advantages
No self generating fungus
Desired in export market
Suitable for self service store display
Disadvantages of C. F. B.
The base kraft paper not of desired standards
Road transport is not developed properly
Lack of Mechanical and Technical knowledge
Improper warehousing
Cargo handler resistance due to fear of damage
Failure to comply with dimensional specification
Supply of moist and damp material when hurry
De-lamination of layers
Use of unspecified adhesive and water proofing agents
Box Manufacturing
There are three steps involved in manufacturing of C.F.B. box.
Slitting and Scoring: This operation trims the board to obtain proper dimension/size
and creases the board for flap folding.
Slotting: Slot is cut made in corrugated sheet usually to form flaps and thus permit
folding.
Position of Slot: End of slot +/- 3 mm from center of flap score. Center of slot +/- 2
mm from center of panel score.
Joining is done by
Stitching (Staples)
Gluing (usually plastic resin adhesive)
Taping (Cloth or paper)
Strength obtained by gluing is good but stitching is common and less expensive.
Depending upon the dimension of box there may be one, two or four joints.
Types of Box: Several designs of CFB boxes are commonly used in Packaging for
Export goods. Some of the designs are as given below.
Half Slotted Container Regular Slotted Container Full Overlap Container
Center Special Slotted
Container
123 Bottom Tuck Top 123 Bottom RSC Top
Glue in Divider Telescope Top or Bottom Half Slotted Container with
Telescope Top
One Piece Folder Five Panel Folder 2 Sided Rollover Tray
2 Sided Rollover Tray with
Flaps and Ears
Auto Bottom RSC Top Infold Clamshell
Applications of C.F.B
Backing boards and folders
Support panels for conservation work & display
Box tray and support fabrication
Shelf lining, dividers etc.
Cushioning material in container
New developments in CFBs for Export Packaging:
Mixed Flute Board: Mixed Flute Board utilizes the advantage of better
printing and better cushioning by using two different types of flute and
thus reducing the cost of the box.
Duo Arch Board: Gives better strength by combining two flutes.
Paper IBC for Liquids made from CFBPaper IBC for Liquid are the ideal replacement for most drums, returnable totes
and bottle-in-cage IBC. Carrying up to 1000 liters of liquid, replaces metal or
plastic drums, reduces the filling and handling cost, provides efficient storage and
transportation.
Picture of Paper IBC for liquid is as shown below. These IBC’s are collapsible and
hence occupy very less volume during storage in the warehouses.
Paper IBC for liquid packaging for Exports in ocean freight container is as shown
in the picture below.
Failures in the CFB during Export:
Adhesive Failure: Adhesive failure in CFB during transport may result in
delamination of the Flute and the Liner, which may occur due to : -
Lower solid content
Lower GSM coating
Poor Quality adhesive
Probable Solutions
Stringent Quality for Adhesive
Bond strength determination by pin adhesion test gives the bonding strength
of the adhesive
Joint Failure: Failure may occur at the joints due to following reasons.
1 Stitching (Staples): Failure may occur due to corrosion of stapler and poor
manufacturing practice.
2 Adhesive Tape Failure: Failure occurring due to poor shear properties of the
adhesive tapes, or poor tensile property of tape.
Box design
The Bureau of Indian Standards (BIS) has published a Standard (IS: 2771) for
Corrugate Boxes. This standard may be used as a guideline for the Packaging of
Export goods where no guidelines are available from the importing country.
Depending upon the nature of contents and the journey intended this can be modified
to achieve economics. The weight carrying capacity and strength requirements as
per the Standard are given in the Table (2) below.
Table 2: Requirements for Corrugated Fibre Board Boxes
Type of Board Maximum Mass
Contents
Maximum Combined Internal Dimensions
(L + W + D)
Maximum Bursting Strength
of the Board (Kgf./cm2 )
Single Wall and Double Wall
5 635 68 750 810 1025 1015 1275 1220 1525 1330 1650 1540 1775 21
Double and Triple Wall
15 1275 1020 1525 1230 1650 1440 1775 1755 1900 2475 2150 29
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