REFERENCE MATERIAL

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					                                                  This document is courtesy of Unisource Canada, Inc.
                                                                              http://www.unisource.ca




REFERENCE MATERIAL
PACKAGE SIZING


Centerfold Film Sizing

Film sizing should always be done by actually putting up some sample packages.
However, for estimating plain film sizing, there are some general guidelines which may
be used.

The PRODUCT WIDTH (W) is run parallel to the CENTERFOLD (CF) edge of the film.
Thus the product width would be run in the machine direction (MD).

The PRODUCT LENGTH (L) or longest dimension of the package is run parallel to the
CUTOFF (CO) or cross seal. This is the CROSS MACHINE DIRECTION (XMD).

Positioning the package as explained above will reduce the length of the cutoff scrap,
thus providing film savings. The following illustration demonstrates this method.

(Insert Picture)



If the package is too long to run in the above manner, then the package length must be
run in the machine direction (MD).
                                                    This document is courtesy of Unisource Canada, Inc.
                                                                                http://www.unisource.ca




REFERENCE MATERIAL
PACKAGE SIZING


Centerfold Formulas

The rule of thumb formula for determining the film WIDTH of centerfolded film required
to package a product is:

MANUAL AND SEMI-AUTOMATIC “L” SEALERS

1. CENTERFOLD FILM WIDTH:
(Product Length) PLUS (Product Height) PLUS 2.0” (0” – 2.5” Height)
(Product Length) PLUS (Product Height) PLUS 2.5” (2.5” – 4.5” Height)
(Product Length) PLUS (Product Height) PLUS 3.0” (4.5”+ Height)

2. CUT OFF (FILM LENGTH)
(Product Width) PLUS (Product Height) PLUS 1.0” (0” – 2.5” Height)
(Product Width) PLUS (Product Height) PLUS 1.5” (2.5” – 4.5” Height)
(Product Width) PLUS (Product Height) PLUS 2.0” (4.5”+ Height)

3. FILM USAGE – To calc ulate the amount of film used – multiply the Film Width (#1
above) by the Cut Off (#2 above) by 2. This will provide you with the total film usage
per-package in square inches.

                (CF Width X Cut Off) X 2 = Film Usage Per-Package


AUTOMATIC “L” SEALERS

1. CENTERFOLD FILM WIDTH:
(Product Length) PLUS (Product Height) PLUS 4.0” (0” – 3.0” Height)
(Product Length) PLUS (Product Height) PLUS 4.5” (3.0” – 6.0” Height)

2. CUT OFF (FILM LENGTH)
(Product Width) PLUS (Product Height) PLUS 1.0” (0” – 2.5” Height)
(Product Width) PLUS (Product Height) PLUS 1.5” (2.5” – 4.5” Height)
(Product Width) PLUS (Product Height) PLUS 2.0” (4.5”+ Height)

3. FILM USAGE – To calculate the amount of film used – multiply the Film
Width (#1 above) by the Cut Off (#2 above) by 2. This will provide you with
the total film usage per-package in square inches.

                (CF Width X Cut Off) X 2 = Film Usage Per-Package
                                               This document is courtesy of Unisource Canada, Inc.
                                                                           http://www.unisource.ca




REFERENCE MATERIAL
PACKAGE SIZING

Using the formula shown on the preceding page, determine the film sizing for the
following packages.

Example: Product Size: 17” L X 8” W X 2” H

CF WIDTH = L 17 plus H 2 plus factor 2
CF WIDTH = 21”

CUTOFF = W 8 plus H 2 plus factor 1
CUTOFF = 11”

1. Product Size: 10”L X 7”W X 1”H

CF WIDTH = L ___ plus H ___ plus ___
CF WIDTH = ________

CUTOFF = W ___ plus H___ plus ___
CUTOFF = ________

2. Product Size: 14”L X 4 ½ “W X 3”H

CF WIDTH = L ___ plus H ___ plus ___
CF WIDTH = ________

CUTOFF = W ___ plus H___ plus ___
CUTOFF = ________

3. Product Size: 10”L X 10“W X 1 ½ ”H

CF WIDTH = L ___ plus H ___ plus ___
CF WIDTH = ________

CUTOFF = W ___ plus H___ plus ___
CUTOFF = ________
                                                     This document is courtesy of Unisource Canada, Inc.
                                                                                 http://www.unisource.ca




REFERENCE MATERIAL
PACKAGE SIZING


Square Inches Per Package

The number of square inches per package is required to determine film cost per
package when the price per 1000 square inches is known.

Formula:

CF WIDTH X CUTOFF LENGTH X 2 = SQUARE INCHES PER PACKAGE

The “2” in the formula is required since when using CF film there are 2 layers of film
being used for the package.

The square inches required for the examples of the previous page.

Example

W 21” X CO 11” X 2 = 462 square inches

1. W ___ X CO ___ X 2 = __________ square inches
2. W ___ X CO ___ X 2 = __________ square inches
3. W ___ X CO ___ X 2 = __________ square inches
                                                     This document is courtesy of Unisource Canada, Inc.
                                                                                 http://www.unisource.ca




REFERENCE MATERIAL
PACKAGE SIZING


Automatic, Horizontal, Form, Fill, Seal Equipment

Automatic form/fill/seal equipment is designed for high-speed packaging (50 to 200
packages per minute). Product is fed into a flighted or belted in-feed where it is fed into
a horizontal tube of film which is formed by a forming shoe with singlewound film. The
edges of the film are overlapped and bonded electrostatically or thermally. Both product
and film are advanced by a vacuum belt into a continuous motion cross seal. The
primary advantages of using this type of equipment is the lack of film scrap and the less
expensive singlewound film.

Recently, automatic side sealing equipment has become quite popular. Product is fed
                                                                           i
into a flighted or belted infeed where it is fed into a horizontal tube of flm which is
formed by an inverted film forming plow (or similar system) with centerfolded or
singlewound film (coming off of a centerfolding device). A side seal system uses wires,
ribbons and other thermal devices to weld the seal along the open centerfo lded edge in
the machine direction. Hot knives or seal wires upstream complete the package with
transverse seals. The primary advantage to this type of system is its moderate range
speeds (usually to 60 packages per minute) and its rapid change over which
accommodates a wide range of products.

(Insert Picture)
                                                    This document is courtesy of Unisource Canada, Inc.
                                                                                http://www.unisource.ca




REFERENCE MATERIAL
PACKAGE SIZING


Singlewood Film Width Sizing Formulas

Bottom Lap Seal Wrappers:

When the PRODUCT SIZE is known – use the following formulas:
1. FILM WIDTH = 2W + 2H + 2.5”
(2 X Product Width) PLUS (2 X Product Height) PLUS 2.5”

2. CUT OFF (OR FILM LENGTH) = L + 2H
(Product Length) PLUS (2 X Product Height)

3. FILM USAGE – To calculate the amount of film used – multiply the Film Width (#1
above) by the Cut Off (#2 above). This will provide you with the total film usage per-
package in square inches.

FW X CO = Film Usage Per-Package With Bottom Lap Seal

When only the PLOW SIZE is known, use the formulas above and substitute 1.5” in
place of 2.5” in the FILM WIDTH calculation (#1 above). Therefore, FILM WIDTH = 2W
+ 2H + 1.5”. The rest of the formula remains as is>

**NOTE: The above calculations provide for a 0.75” lap seal width.

Side Seal Wrappers:

1. SINGLEWOUND FILM WIDTH = 2W + 2H + 3.0”
(2 X Product Width) PLUS (2 X Product Height) PLUS 3.0”

2. CENTERFOLDED FILM WIDTH = W + H + 1.5”
(Product Width) PLUS (Product Height) PLUS 1.5”

3. CUT OFF = L +2H
(Product Length) PLUS (2 X Product Height)

4. SINGLEWOUND FILM USAGE = To calculate the amount of film used – multiply the
Film Width (A above) by the Cut Off (C above). This will provide you with the total film
usage per-package in square inches.
                  FW X CO = Film Usage Per-Pkg With Side Seal
                                 (Singlewound Film)
                                                   This document is courtesy of Unisource Canada, Inc.
                                                                               http://www.unisource.ca




REFERENCE MATERIAL
PACKAGE SIZING


Singlewood Film Width Sizing Formulas Con’t

Side Seal Wrappers:

5. CENTERFOLDED FILM USAGE = To calculate the amount of film used – multiply the
Film Width (B above) by the Cut Off (C above) X 2. This will provide you with the total
film usage per-package in square inches.

                (FW X CO) X 2 = Film Usage Per-Pkg With Side Seal
                               (Centerfolded Film)


REMEMBER: ACTUAL FILM SIZING AND USAGE IS HIGHLY DEPENDENT UPON
OPERATOR TECHNIQUE AND MACHINE SET-UP. ACTUAL SIZES CAN ONLY BE
DETERMINED AFTER FUNNING THE MACHINERY UNDER NORMAL PRODUCTION
CONDITIONS.

				
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