Wiratech FB-770 Series User manual

Contents
1. Use ………………………………………………………………1
2. Safety Instructions ……………………………………………1
3. Specifications …………………………………………………1
4. Performance Features ………………………………………2
5. Structure & Working Principle ………………………………2
6. Operation Instruction …………………………………………4
7. Circuit Diagram ………………………………………………7
8. Breakdown Drawing of Sealing Unit ………………………8
9. Breakdown Drawing of Conveyor Table ……………………12
10.Breakdown Drawing of Worm-gear Case……………………14
11.Breakdown Drawing of Body…………………………………15
12.Breakdown Drawing of transition Part of FRB-770II…………17
13.Troubleshooting ………………………………………………18

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1. Use
This sealer can seal plastic films made from various materials, which is widely used in fields of
food, medicine, chemicals, daily use and vegetable seeds etc. It is ideal sealing equipment for
packing batch products in factories and shops.
2. Safety Instructions
2.1 Ensure that the adopted power supply is correct. The machine adopts single-phase three
wire system (AC 220V/50HZ). The wire whose color alternates between yellow and green is
leakage protection ground wire, which should be earthed and cannot be removed. The
power line should be prevented from pressing, please tidy away when it is not in use.
2.2 After being connected to power supply, do not touch any electric device.
2.3 Never touch any transmission parts when the machine is running, or personal injury may
occur.
2.4 Never touch the heating block when the machine is running.
2.5 Never operate the machine in corrosive environment or with high humidity.
2.6 Do not change any parts of the machine without being duly authorized by the Manufacturer’s
technician.
2.7 Keep the machine clean both inside and outside and clear dirt from sealing belt in time.
2.8 Fill and exchange oil in worm-gear case regularly. Meanwhile, remember to oil gear and
sprocket (YP7408 semi-liquid gear oil).
2.9 Cut off the power supply when the machine is not in use.
2.10 Keep this operation manual with care for easy reference.
3. Specifications
Model
Parameter
Item
FRB-770 I
(Horizontal type)
FRB-770 II
(Vertical type)
FRB-770 III
(Console type)
Voltage(V/Hz)
AC 220/50 110/60
Motor power(W)
50
Sealing power(W)
300×2
Sealing speed(m/min)
0~12 (0~16)
Sealing width(mm)
10
Temperature control range(℃)
0~300（℃）（ Stepless adjustable）
Distance from sealing center to
conveyor table（mm）
20~40
150~270
20~40
Film thickness(monolayer) mm
≤0.08
Max. single package loading of
conveyor (Kg)
1
Max. overall loading of conveyor (Kg)
3
External dimensions
(LXWXH)（mm）
840×380×320
840×380×450
840×550×800
Net weight (Kg)
32
37
40

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Note: For FRB-770 series, the bag is fed-in from right. For FR-770 series, the bag is fed-in from
left.
4. Performance Features
4.1 This sealer, adopting electronic thermostat control unit and stepless speed-regulation
transmission mechanism, can seal various plastic film bags made from different materials
and can also be equipped with varied packaging production lines. The machine has no
limitation on sealing length, featured by high efficiency for continuous sealing, reliable
sealing quality, rational structure and convenient operation etc.
4.2 This series provides three models, including horizontal type, vertical type, console type. The
horizontal type suits for packaging dry materials, while vertical type suits for packaging
materials in powder shape or liquid shape.
5. Structure & Working Principle
5.1 This machine is made up of rack, speed-regulating mechanism, sealing temperature control
system, transmission and conveying system etc. (see following figures)
FRB-770I
Figure 1
1.feed opening 2.driven wheel seat (adjusting block) 3.driven wheel 4.control panel 5.heating
block 6.holding plate 7.pinch roller 8.cooling block 9.driving wheel 10.embossing roller
11.silicone wheel 12.guiding wheel 13.conveyor belt 14.conveyor table 15.fastening knob
for elevating table 16.transverse tightening knob for conveyor table 17.ledge
FRB-770II
Figure 2

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1.conveyor table 2.driving roller 3.conveyor belt 4.fixed bracket 5.slip bracket 6.safety
cover 7.adjusting knob for embossing roller 8.housing 9.air switch 10.control panel
11.feed opening 12.fastening knob 13.worktable 14.adjusting knob for conveyor belt
15.tightening nut 16.transverse tightening knob for conveyor table 17.rack 18.vertical
shaft 19. gimbal assembly 20. bevel gear assembly
FRB-770III
Figure 3
5.2 After power supply being connected, electrothermal elements start to produce heat, which
leads to rapid temperature rise of both upper and bottom heating blocks. Adjust temperature
controller and speed-regulating mechanism to get the required temperature and speed
respectively. The sealing area of plastic packing bag is conveyed into the clearance between
two sealing belts by conveyor belt first, then clamped by two sealing belts and delivered into
the heating area. The plastic film is heated and fuses. Under the pressure from pinch roller,
the film binds. After this, the sealing area will be conveyed into the cooling area for cooling
and figuration, and then to be pressed by embossing roller for making stripe or netted
pattern.
The running of transmission part of the sealer is started by motor, which drives sealing belts,
guiding belts and conveyor belt through gears to run synchronously.

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6. Operation Instruction
6.1 Control panel (see Fig. 4)
Figure 4
6.2 Prepare the machine before use
6.2.1 This machine is equipped with grounded socket. Please check whether it is well
connected so as to ensure operation safety.
6.2.2 First-time use or too long intermission will make the electronic heating elements
moistened, so several minutes’ low-temperature preheating is necessary before normal
operation.
6.2.3 Adjust the conveyor table’s height and horizontal position to meet the packing
requirement.
6.2.4 According to the distance from sealing line to the edge of bag opening, regulate the
position of feed opening.
6.2.5According to the material and the thickness of the object to be sealed, adjust the clearance
between upper heating block and bottom heating block, as well as the clearance between
upper cooling block and bottom cooling block.Adjust the clearance between two sealing
belts by adjusting stopping flakes 2 according to Fig.5, specifically, turn the stopping flake
clockwise to raise block (increase clearance) or counterclockwise to lower block (decrease
clearance). The clearance between two sealing belts should be equal to the thickness of the
packing bag in one layer approximately, which must guarantee sealing fastness,
high-definition embossing and ensure proper length extended from two ends of sealing area
as well.
6.2.6 Exchange and adjust the sealing belt
6.2.6.1 Remove the safety cover, after the heating block get cool, turn stopping flakes on both
upper heating block and upper cooling block by 90°to lift both two blocks, then loosen the
springs on both embossing roller and pinch roller, meanwhile, remove the guiding belt, so as
to make it ready for removing sealing belts. (see Fig. 5)

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1. screw 2. stopping flake 3. fastening screw 4.nut
Figure 5
6.2.6.2 Move the driven wheel seat (adjusting block) towards heating block, and remove the
sealing belt.
6.2.6.3 Replace with a new sealing belt and install the guiding belt back.
6.2.6.4 Put the driven wheel, heating and cooling blocks, and pinch roller etc to the original
position.
6.2.6.5 Connect to the power supply to test the machine.
6.2.6.6 Install the safety cover. When the temperature reaches the set temperature, the
machine is ready for working.
6.2.7 The transverse adjustment of conveyor table: loosen the adjusting knobs 1 on both sides
first, and then move the conveyor table in the long slot along the foot rest 2. Tighten the
knobs on both sides after finishing the adjustment.
1. adjusting knob 2.foot rest
Figure 6
6.3 Regulate the adjusting block of driven wheel
If the sealing belt is off tracking, regulate the adjusting screws on driven wheel seat (adjusting
block), shown as Fig. 7.

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1. driven wheel seat (adjusting plate) 2. driven wheel seat (adjusting block) 3/4. adjusting screw
5. spring Figure 7
6.4 Starting procedure
6.4.1 Connect to the power supply and press Start switch, indicating light will be on, and then
adjust the speed-adjusting knob.All transmission parts start to run synchronously.
6.4.2 Fine tune the knob of embossing roller to make that wheel swivel, after getting the proper
pressure, fix limiting screw.
6.4.3 Once turn Heat Seal switch ON, the green light of the electronic temperature controller will
light.According to the material and thickness of the packing bag, adjust the temperature
controller to the necessary temperature. When the heating blocks begin to preheat, the
machine needs to be started meanwhile and kept running at low speed.
6.4.4 That whether it is necessary to turn on the fan for cooling depends on the material and
thickness of packing bag.
6.4.5 Flatten and align sealing opening, then feed the bag by aligning the bag opening with the
feed opening. When the bag opening is gripped by the sealing belts, which makes the bag
move forward automatically, at that moment, please do not push it in or pull it out by force,
otherwise irregular sealing or breakdown will happen.
6.4.6 If it is found that there is dirt attached to the sealing belt or the heating block, stop the
sealer and clear it. Never clear the dirt with your hand when the temperature is high.
6.5 Stop operation
In order to prolong the service life of the sealer, please remember, before shutting down the
machine, you should return the temperature-regulating knob to 0 position first, then turn on
the fan, at this time, the temperature on the indicator begins to fall and the sealing belt
should still be in state of running. About several minutes’ later, when the temperature drops
below 100℃, only can you turn off the fan and main power.
6.6 Emergency Stop switch
In case of emergency, press Emergency Stop switch to stop machine immediately. It is a kind
of self-lock switch.Release it by turning it by 120 °clockwise.
6.7 The unloading method of the control panel:
6.7.1 Remove the rear cover of the housing.
6.7.2 Remove the Emergent Stop Switch ( Rotate the red knob on the emergent stop switch
anticlockwise and remove. Then rotate the silver snap spring under the red knob

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anticlockwise and remove ), then remove the pins in the front and back of the temperature
controller.
6.7.3 Push the control panel along the arrow A (the jousting is not connected with the panel
now.), then remove the panel along the arrow B.
7. Circuit Diagram

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8. Breakdown Drawing of Sealing Unit
Figure 8

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Item
Description
Quantity
Remark
8-1
feed opening
1
8-2
spring for driven wheel seat
2
8-3
upper driven wheel seat
1
8-4
bottom board
1
steel: 102102-3
8-5
support for safety cover
1
880
8-6
safety cover
1
8-7
672 corrugated knob
（M8X35）
1
adjusting knob for
embossing roller
8-8
supporting board for adjusting embossing roller
1
8-9
spring seat of embossing roller
1
8-10
spring of embossing roller
1
8-11
small pulley shaft
2
8-12
small pulley
2
8-13
606-2Z bearing
2
8-14
embossing roller seat
1
8-15
embossing roller
1
8-16
6201-Z bearing
9
8-17
transmission shaft
1
8-18
round nut
1
8-19
big washer
1
8-20
connection shaft
1
8-21
driving wheel
2
8-22
square bearing seat
3
8-23
driving wheel shaft
2
8-24
silicone wheel shaft
1
8-25
silicone wheel
1
8-26
silicone wheel cover
1
8-27
guiding belt
2
428X6X4(40°)
8-28
sealing belt
2
770X15X0.2
8-29
driven wheel
2
8-30
bottom driven wheel seat
1