The working principle of the double-layer blown film machine is to extrude two layers of plastic at the same time to form a double-layer film. The process begins by feeding plastic resin pellets into the machine’s hopper. The pellets are then melted and forced through a circular die, where they are formed into a tubular shape.
As the tubular film is extruded, a second layer of plastic is introduced through a separate extruder and combined with the first layer to form a two-layer film. The two layers are then cooled and stretched to the desired thickness and width before being flattened and wound onto rolls for further processing or use.
The two-layer film-blowing machine is equipped with a control device to adjust the temperature, speed, and thickness of the film, and can accurately produce two-layer films with different properties and characteristics. The process can create films with specific barrier properties, strength, and other performance attributes.
Two Layer Film Blowing Machine Characteristics
1. Double-layer co-extrusion complex film can extend liquid packing fresh period.
2. Both the barrels and screws of two extruders are made of high quality alloy steel through nitration and precision finishing with the best hardness and corrosion resistance.
3. The die-head adopts double-layer co-extrusion rotary die,which can minish the film’thickness error farthest .
4. Accessorial equipment with flat type working table makes the operation easily and also epuipped with bubble cage.
5. Winding unit: double rewinders and double cutting. The drive adopts torque motor,which can keep the suitable tension,rewind the whole roll easily.
Two Layer Film Blowing Machine Main Technical Variables
| Model | SJ-45*2/RG600 | SJ-65*2/RG1500 | SJ-65*2/RG2000 |
| screw diameter(mm) | 45/45 | 55/65 | 70/65 |
| screw(L/D)ratio | 30:1 | 30:1 | 30:1 |
| screw Max.Rotary speed(r/min) | 110 | 110 | 110 |
| output(kg/h) | 110 | 140 | 160 |
| Main motor power(kw) | 11/11 | 18.5/30 | 30/37 |
| die-head diameter(mm) | 150 | 450 | 550 |
| film thickness(single layer) (mm) | 0.02-0.15 | 0.02-0.15 | 0.02-0.15 |
| film Max.Folding width (mm) | 600 | 1500 | 2000 |
| total power(kw) | 55 | 85 | 95 |
| weight(kg) | 4500 | 6000 | 6500 |
| overall dimension (m) | 4.6×3.5×6 | 5.2×4×7.5 | 5.5×4.5×10 |
Film Blowing Extruder Machine Main Parts Parameter and pictures
Fix Die head: Taiwan design high speed die head:
1, #645 steel stronger
2, Surface treatment,which make film more transparent
3,bigger size than normal, which improve the output of machines
Fast screen changer: Fast screen changer:
1, Save worker working
2, Never leakage for materails
3, Easily to change the fiter, save time
Double vent air ring:
1, two lip to cool the film, it is faster than one lip.so it can improve the output of machine
Electric parts: Omron Temperature controller, Schneider Switch
Controller box and LG inverter:
Screw: Copied from Taiwan
1.Material of screw and barrel: 38CrMoAlA
2.Material Element Analysis:
C: 0.35～0.42 Si: 0.20～0.45 Mn: 0.30～0.60 S: ≤0.035 P: ≤0.035
Cr:1.35～1.65 Al: 0.70～1.10 Ni: ≤0.030 Cu: ≤0.030 Mo:0.15～0.25
3.Hardness of tempering: HB260-290
4.Depth of nitriding: 0.4-0.7mm
5.Hardness of surface: HV900-1050
6.Roughnessof surface:Ra0.32
7.Linearity of screw: 0.015mm/m
8.Bimetal screw: Bimetal layer on the screw thread,Tungsten Carbide
9.Hardness of bimetal layer: HRC58-62
10. Depth of bimetal layer: 2-3mm
11. Bimetal layer elements: Fe, Ni, Wc, B, C, Cu, ect
Main motor: Siemensbrand
1, Runing Speed: 1400rpm
2, Motor power: , 380V, 3phase. Pwoer can be changed according yours
3, Motor Life: more 10 years.
Gearbox:
1, Fucntion: reduce the speed of transfer
2, Speed rate: 10:1
3, Gear: Hard surface type, high quality.
4, Lubrication oil for transfering
5: Low noise and longer life
Heater: Ceramic heater fucntion:
1, Heating faster than stainless heater
2, Life is longer to 5 years.
3, Keep hot inside is longer than stainless, save power.
4, High quality ceramic and heating wire Inside.
Cover: Stainless cover:
1, Separate stainless cover to control heater better and save the power consuption.
2, Separate blower on stainless cover.
3, Nice outlook for stainess cover.
4, High speed blower to cool barrel.
Two layer film blowing machine is used for blowing low-density polyethylene(LDPE),high-density polyethylene(HDPE)and linearity low-density polyethylene( LLDPE)etc. plastic complex film ,It’s widely used for liquid packing, printing material, exported product packing, industry product packing etc.The outside layer and inner layer can use different materials.The final film can be used as an express bag, food packaging, etc.