Shrinkfast 998 Manual de usuario
Operating, Field Maintenance,
and Parts Manual
Model
998
General Safety Precautions
Never point the gun at anyone.
Inspect hose before each use for breaks or weakened spots.
Always shut off valve at tank when leaving the gun unattended for any length of time.
WARNING: DO NOT TOUCH WIRE METAL SHIELD AFTER GUN HAS BEEN FIRED.
Table Of Contents
I. Introduction
II. Which Bag To Buy
III. Which Tank To Use
IV. Ventilation Requirements
V. Operating Instructions
A. Controls
B. Connections
C.Start-up
D.How To Shrink
1. Pallets
2. Patching
3. Large Goods
VI.Service Information
A. Principles Of Operation
B. Troubleshooting
C.Assembly and Disassembly
D.Technical Specifications
E. Parts Breakdown & Spare Parts
I. Introduction
The New SHRINKFAST Model 998 heat
shrink tool has evolved from the previous
models 975 and 305X. The major new fea-
tures include cool combustor, lightweight,
durable and safety/trigger mechanism that
automatically shuts off if it should be
dropped. The simple design allows for field
repairs to be completed quickly and effi-
ciently.
The manual has also evolved into a simpli-
fied format which, if read carefully, will
greatly enhance the operator’s skill in using
the tool. In addition, every operator should
be particularly aware of the safety require-
ments covered in Section III WHICH TANK
TO USE and in Section IV VENTILATION
REQUIREMENTS.
II. Which Bag To Buy
Bag makers can usually be found in the
Yellow Pages under Packaging Supply
Houses or Bags – Transparent. Salesmen
are generally knowledgeable and can give
you good advice, but you should keep the
following facts in mind:
1. Not all plastic bags are shrink bags;
therefore, be specific. Shrink film should
always be made of virgin plastic, not
reprocessed material.
2. Bags come in various thicknesses. The
bag thickness is measured in mils. The most
common is 5 mil. For light loads such as a
load of cookies at 100 lbs./pallet, a 3 mil
bag should be satisfactory. However, drums
of molasses, for example, at 2000 lbs./pal-
let would require 6 mils or more.
3. Bags are made in two styles, centerfold
and gussetted. Gussetted bags shrink equal-
ly in both directions (35%/45%) and are trou-
blesome because they tend to pull up and
away from the pallet. Therefore, they should
be bought longer than the pallet height, and
special care should be taken in the bottom
shrink. Centerfold bags shrink mostly in one
direction around the pallet (60%/10%);
therefore, they don’t have a tendency to pull
up off the pallet.
4. Bag dimensions are specified by the
lay-flat length and width. Example:
To calculate the width, add:
1. The two sides 30”
47”
77”
2. Fitting allowance 4”
WIDTH 81”
To calculate the length, add:
1. 1/2 of the short side 15”
2. The height 36”
3. Shrink allowance –
1” for each foot of height 3”
LENGTH 54”
In this case the bag size is 81” x 54”.
III. Which Tank To Use
Two types of tanks are commonly available:
liquid withdrawal and vapor withdrawal. It is
crucial to use the vapor withdrawal type.
Never try to run the gun on a liquid with-
drawal tank.
Using a liquid withdrawal tank will clog the
orifice filter and may result in an extremely
dangerous long flame.
Tanks are available in 6, 8, 10, 20, 30, and
40 lb. Sizes. The gun will run on a 6 lb.
Tank if used only intermittently. Larger tanks
should be chosen for continuous use.
Tank pressure depends on the temperature
of the tank. At room temperature (72°F) the
pressure is 110 PSI and drops to 22 PSI at
0°F.
When in use, the temperature of the tank
drops due to the evaporation process of liq-
uid propane to propane gas.
After prolonged use the temperature of the
tank may drop to 0°F usually accompanied
by icing on the outside, and the propane
pressure drops below 15 PSI. DO NOT RUN
THE GUN WITH THE PRESSURE BELOW 15
PSI.
Small or nearly empty tanks ice up faster
than large, full tanks. Typically, a full 30 lb.
Tank , if run continuously, will run 90 min-
utes before it ices up. If the production
rates demand continuous use, the following
methods may be employed:
1. Multiple tanks. Switch the gun from one
tank to another.
2. Fan. An ordinary desk Fan fan at the
tank. The air flow around the tank will keep
it from icing up.
IV. Ventilation Requirements
In operation, the gun consumes propane
and air and produces carbon dioxide, car-
bon monoxide, and water vapor.
Prolonged exposure to carbon monoxide is
lethal and adequate ventilation must be pro-
vided if the gun is to be operated indoors.
The graph (right) shows measurements of
the amount of CO generated (expressed as
a percentage of the fresh air consumption
of 20 cu. Ft./min.) as a function of flame
adjustment:
The amount of CO generated depends on
the flame adjustment, but does not exceed
0.25% within the limits of very rich and very
lean. (By way of comparison, a 35HP forklift
truck running on propane generated 6 times
as much CO).
To maintain a safe CO concentration of 50
parts per million (OSHA standards
1910.93), the ventilation requirements are
2000 cu.ft./min. while the gun is operated
at the maximum operating pressure of 30
PSI.
Based on a 1 1/2 minute heating cycle per
pallet, the fresh air requirements are 3000
cu.ft./pallet. For a production rate of 10 pal-
lets/hour, a ventilation system with a contin-
uous capacity of 500 cu.ft./min. is ade-
quate. For different production rates, the
ventilation capacity should be sized propor-
tionally.
In areas where ventilation is provided by
open doors or windows, a safe level of CO
will be maintained as long as the room tem-
perature does not rise above 150°F.
V. Operating Instructions
A. Controls
No. Part Function
1Safety Trigger Prevents accidental gas release
2Gas Handle Actuates gas valve and igniter
3. Gas Valve Open fuel flow
4. Igniter Fires piezoelectric spark igniter
5. Fuel line Carries fuel to orifice
6. Filter Prevents clogging
7. Orifice Meters fuel
8. Spark Plug Ignites mixture
9. Flame Holder Prevents flashback and flame out
10. Hose Connects regulator and gun
11. Regulator Regulates pressure to gun
12. Adjustment screw Sets pressure
13. Pressure Gauge Indicates pressure in the line
14. Pol Fitting Connects and contains excess flow check valve
15. Tank See section on tank
16. Tank Valve Opens/closes fuel supply
For ordering of spare parts, see page XX and XX.
Tabla de contenidos
Otros manuales de Herramientas eléctricas de Shrinkfast
