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LQSD-450A Automatic Center Sealing Bag Making Machine

Automatic Center Sealing Bag Making Machine
  • LQSD-450A
  • UPG

Equipment and relevant Parameter

1. Unwinding turret:

a) Tension force control of unwinding.

⑴ permanent tension brake, magnetic powder detent

⑵ Unwinding positive feeding structure, transducer sends out material on average speed

⑶ Control mode: computer instruction, dancing roller displacing sensor controls roll sending out speed

⑷ Fixed taper cone nip unwinding shaft (air expanding shaft)

b)   Edge position control (EPC)

     ⑴ Configuration: screw mandrel secondary control, unwinding turret movement

     ⑵ Control modality: reflection electric potentiometer sensor testing, independent control.

     ⑶Tracking accuracy: 0.5mm

     ⑷Adjustment range: 150mm

     2. folding section

     ⑴ Configuration: two sides folded at same time, one side adjustable

     ⑵ Adjustment: manual regulation

     3. Vertical sealing setup:

     ⑴ Configuration: vertical disposition iron pressing, cooling assembly spring pressing structure

   ⑵ Drive: main electric machinery drives coupling rod of eccentric mechanism to do curve motion

   ⑶ Quantity: One team on vertical thermal sealing, one team on cooling, two teams on vertical shaping.

   ⑷ Length: 840mm(sealing unit)  720mm(shaping unit)

     4. Horizontal sealing setup:  

     ⑴ Configuration: horizontal disposition iron press assembly spring structure, cooling assembly

   ⑵ Drive: main electric machinery drives coupling rod of eccentric mechanism to do vertical motion

   ⑶ Quantity: three teams on thermal sealing, one team on cooling

   ⑷ Length: 510mm

    5. Film feeding device

     ⑴ Configuration: pneumatic pressing rubber roller friction type

     ⑵ Drive: imported fully digital runoff production servo mechanism (Servo motor 1.5Kw, Panasonic Japan)

     ⑶ Transmission: synchronous band and wheel

     ⑷ Control modality: centralized computer control, synchronous length fixing and automatic photoelectrical tracking system)

    6. Middle tension

     ⑴ Configuration: dance roller tension force structure, set signal  

     ⑵ Control modality: centralized computer control

     ⑶ Mechanism of control: complementary trend of dance roller tension movement control the middle servo step length to achieve stop and begin at the same time

     ⑷ Testing form: electromagnetism approaching switch (NPN)

     ⑸ Adjustment range of tension force: 0.1-0.2mm (computer setting, automatic reciprocate)

7. Main transmission device

     ⑴ Configuration:  crank rocker push pulling coupling rod structure

     ⑵ Drive: Panasonic 3KW servo motor controls

     ⑶ Transmission: servo reducer ratio 1:10

     ⑷ Control modality: centralized computer control

     ⑸ Movement mode: main motor running drives frame to do vertical movement

8. Automatic positioning device

     ⑴ Testing form: tracking testing of reflection photoelectrical sensor

     ⑵ Testing accuracy: 0.01- 0.25mm

     ⑶ Integrative positioning accuracy: ≤0.5-1mm

     ⑷ Photoelectrical searching range: ±3mm

     ⑸ rectifying equalizing range: ±3mm

     ⑹ positioning rectifying method: servo tracks current compensating, photoelectrical automatic movement rectify system

9. Temperature control setting:

     ⑴ Testing form: thermocouple test

     ⑵ Control modality: independent control, PID adjustment, solid state relay

     ⑶ Temperature setting range: normal temperature and up to 360℃

     ⑷Temperature testing point: middle part of electric heaterkeep temperature even

10. Cutting knife

     ⑴ Configuration: upper cutting knife + adjustment equipment + fixed bottom cutting knife

     ⑵ Form: spring shear knife

     ⑶Transmission: main motor driving, eccentric mechanism vertical movement

     ⑷ Adjustment: horizontal movement (double end)




Center Sealing, four side Sealing, Three servos (feeding motors are servo, main servo motor), One inverter.


BOPP, CPP, PET, nylon and etc plastic laminated film, multi-layers coextrusion films, pure aluminum, plating aluminum laminated film, paper plastic laminated film


Highest bag making speed

150 time/min

Normal speed

30-120 time/min


Highest material sending out line speed

≤30 m/min


Size of bag

Width: 60-420 mm

Length: 60-500 mm (6 times skip function)

Width of sealing

 6-40 mm

Bag style


Center Sealing bag with Max width 420mm、Four side sealing (600-700mm)


Size of material roll

Ø 600*950 mm

Positioning accuracy

±1 mm

Hot sealers

One team on vertical thermal sealing, one team on cooling, two teams on vertical shaping,

Three teams on horizontal thermal sealing, one team on horizontal

Temperature control quantity

11 routes

Temperature control setting range


Power of whole machine


Overall dimension ( L*W*H )


Net weight of whole machine

About 4000Kg


Main machine body in black, cover in white