Foshan Chang Libao Packaging Machinery Co., Ltée.
Thank you for choosing Chang Libao thermoforming vacuum packaging machine.
Important Notes:
Basic Installation Precautions:
Shandong Lu Kang Food Packaging Machinery Co., Ltée. is a professional manufacturer of vacuum packaging machines. The vacuum packaging machines produced include 400/2L, 400/2S, 700/2S, 800/2S, and CB-520, CB-420, CB-320 and other models, with dozens of varieties.
The CB series thermoforming vacuum packaging machine was developed by absorbing advanced world technology at the end of the last century. Its performance indicators are close to or exceed international advanced levels, making it a new type of fully automatic thermoforming vacuum packaging machine suitable for China’s national conditions. This machine is suitable for vacuum packaging of various meat products, légumes, fruits, and other foods. Common models of this machine include CB-320, CB-420, CB-520, etc.. Special models can also be customized according to user requirements. The machine’s working process is as follows: bottom film stepping motion → bottom film heating and thermoforming → loading → covering top film → vacuuming and heat sealing → transverse cutting → longitudinal cutting → discharging. The entire process is automatically controlled by a programmable controller (API). The machine has a reasonable structure, is easy to adjust, and works reliably. Its production efficiency is very high, several times that of ordinary packaging machines. It can save labor and reduce production costs (its packaging cost is lower than using vacuum bags). The packaging effect is close-fitting, beautiful, transparent, and three-dimensional, which meets the packaging requirements of large supermarkets and is a must-have high-end equipment for large-scale enterprises.
The main structure of the machine includes: frame, film clip chain, transmission mechanism, top film installation roller and top film idler roller, bottom film roller, bottom film idler roller, forming chamber, loading area, vacuum packaging chamber, cross-cutting knife, longitudinal cutting knife, pneumatic system, vacuum system, electrical control system, etc..
The bottom film moves forward under the clamping of the film clip chain equipped with film clips. The film clip chain realizes precise stepping movement under the drive of the frequency conversion (or servo) transmission system. The machine adopts foreign famous brand servo motors, programmable controllers (API) and touch screen automatic control, which are precise and reliable in control and simple to operate.
The forming chamber consists of upper and lower working chambers and forming molds corresponding to the new products being packaged. The upper working chamber is fixed to the frame by bolts through guide posts. The upper working chamber moves up and down reciprocally under the drive of the cylinder. The upper working chamber is equipped with heating plates and thermal insulation boards. The forming heating temperature is controlled by a temperature controller (or temperature control module) and a thermocouple. The user can easily set the forming heating temperature on the temperature controller panel. The working process is that the lower working chamber first goes up to its upper limit position. After the upper and lower working chambers are completely sealed by the silicone sealing pad, the heating plate preheats the bottom film. Then the lower working chamber evacuates to generate a tensile force on the bottom film, sinking into the forming mold to become a geometric shape corresponding to the product to be packaged. The forming temperature varies depending on the quality, matériel, thickness, hardness of the stretched film used. The reasonable forming temperature is determined by testing, generally around 90°C. The maximum drawing depth of this machine is about 80 mm. The required drawing depth is adjusted by the liner in the lower chamber during operation. According to user requirements, the forming mold can be customized.
The products to be packaged are manually placed into the bottom mold cavity in the loading area. The loading area has a material carrier, which is selected and used according to the corresponding forming mold, which is very simple to insert and use.
When the packaged product enters the packaging chamber driven by the bottom film, the top film is automatically covered, and vacuuming and heat sealing are completed in the vacuum packaging chamber.
The vacuum packaging chamber consists of upper and lower working chambers. The upper working chamber is equipped with heating plates and airbags. The airbag inflation pressure is between 0.05 and 0.2Mpa, and the maximum should not exceed 0.25Mpa, otherwise the airbag and electric heating plate will be damaged. Vacuum chamber working process: When the packaged material enters the working chamber, the lower working chamber rises to the upper limit position under the drive of the cylinder and is sealed into one with the upper chamber. Then the air in the packaging cavity is extracted by the vacuum system, and the heating plate is driven downward by the airbag inflation to heat and seal the sealing area. The sealing temperature is generally around 130°C. In order to prevent the packaging film from sticking to the heating plate, the heating surface of the heating plate is coated with a non-stick plastic coating. If the heating plate temperature is too high or other improper operation causes it to stick to packaging film plastic dirt, etc., it should be checked regularly and carefully wiped off with a soft object or soft cotton cloth at a certain temperature (about 100°C). Sharp objects are strictly prohibited to prevent damage to the non-stick coating.
The machine adopts punch-cutting for transverse cutting of the packaging film, and is generally equipped with 4 cross-cutting knives. The cross-cutting knife consists of upper and lower knives. The upper knife is a toothed knife die, and the lower knife is a serrated blade, which coincides with the upper knife die. The lower knife is driven upward by a cylinder, and the lateral clearance between the upper and lower knives should be reasonable (see the instructions later for adjustment). The four cross-cutting knives are controlled by pneumatic valves, API, and touch screen. If there are several rows of products in the left and right direction in one pitch or in one working chamber, then select several rows of knives on the touch screen. Par exemple, if it is one row of products, select “one row of knives” on the touch screen, and if it is two rows of products, select “two rows of knives”, and if it is three rows of products, select “three rows of knives”……Then the “API” will automatically select the required cross-cutting knives among the 4 cross-cutting knives.
The machine’s longitudinal cutting knife adopts a rotary cutting knife. The longitudinal cutting knife also consists of upper and lower knives. The upper knife is a high-speed rotating circular blade, and the lower knife is made of aluminum alloy. The lateral clearance between the upper and lower knives should be reasonable to prevent damage to the blade and affect the cutting effect. The number of longitudinal cutting knives is determined by the mold used. There are several sealing lines, and several knives are used.
The machine’s vacuum system consists of a vacuum pump, pneumatic vacuum valve, vacuum pipeline, and joints. The machine uses a German original imported “vacuum packaging machine special pump”. According to user requirements, a vacuum pump with a pumping rate of 100m3/h—300m3/h can be equipped. In order to improve the intake cleanliness of the vacuum pump and extend the service life of the vacuum pump, the machine is equipped with an intake filter, which needs to be cleaned regularly to prevent it from blocking and reducing the pumping rate of the vacuum pump.
Most of the actions of the machine’s forming lower chamber, vacuum lower chamber, cross-cutting lower knife, high-pressure sealing, top film braking, and date printing are realized by solenoid valves, cylindres, and compressed air systems. Donc, users are required to have a compressed air station or a spare air compressor with a supply volume of not less than 0.5m3/min. In order to ensure the long-term safe and normal operation of the equipment, the user’s compressed air pipeline system must be equipped with a matching oil-water separator. Note that the oil-water separator equipped by the user and the oil-water separator installed on the machine must drain water every shift. Pay more attention to this point in humid working environments, and increase the number of water drains if necessary.
The machine uses 50HZ, 380V three-phase five-wire power supply, three-phase wire one neutral wire one ground wire. When the phase wire neutral wire is connected to the machine, it should correspond one-to-one. The neutral wire and the phase wire cannot be connected incorrectly. After careful verification, the machine can be powered on, otherwise the 220V electrical appliances of the machine will be burned out by high voltage! Pay attention to this point, and then verify the forward and reverse rotation of the motor. Enfin, after verifying that there is no error, the machine can be powered on and work normally. The main components used and the power supply mode are: The main controller PLC requires a DC 24V power supply, and the 24V DC power is supplied by the switching power supply in the electrical box. The stepping control system adopts foreign imported servo motors, which are precise, écurie, and easy to operate.
The human-machine interface adopts foreign famous brand touch screen, 24V DC power supply. Pay attention not to reverse the “+” et “-” terminals of the 24V DC power input end during maintenance, otherwise it may cause damage to the touch screen. Adjustment of parameters on the touch screen: The vacuuming time can be adjusted arbitrarily according to needs, generally 3-15 seconds. The preheating time is generally set to 3-6 seconds. The stretching time is 2 seconds. The venting time is generally not less than 1.0 second. When adjusting the touch screen, do not use too much force. Juste “touch” it to prevent damage to the screen and cause major losses (the touch screen is expensive electronic equipment).
Heating temperature control part: Electric heating plates are installed in the forming chamber and vacuum chamber respectively, 220V AC single-phase power supply, and built-in thermocouples. The temperature controller is “OMRON” temperature control module, and the temperature display and control are simple, convenient, and intuitive on the touch screen.
There is a safety switch under the cross-cutting knife cover of the machine. The power supply is low-voltage 24V DC. When the knife cover is not installed or the installation position is incorrect, it cannot move, and the machine cannot work, so as to play a safety protection role, which can prevent accidentally putting hands under the knife and avoid personal injury accidents. Donc, users must not arbitrarily change this function or accidentally introduce high-voltage electricity into the electrical box through the switch, which will damage electronic equipment using 24V power and cause damage to the machine.
| Machine Length | Approximately 5.94 mètres |
| Machine Width | 910 mm |
| Machine Height | 1.85 mètres |
| Poids net de la machine | ≥1780kg |
| Top Film Width | 393 mm |
| Bottom Film Width | 422 mm |
| Net Weight of Top and Bottom Film Roll | ≤20kg |
| Working Chamber Volume | 374×370×100mm (actual size varies depending on specifications) |
| Vacuum Pump Pumping Rate | 100-200 m3/h |
| Highest Vacuum Degree | ≥50pa |
| Compressed Air Pressure | ≥0,6 MPa |
| Alimentation | 380V AC 50HZ, three-phase five-wire system |
| Average Power | 7.8KW |
| Peak Power | 12KW |
| Packaging Rate | ≥4 times/minute |
Note: There are special pads at the suction hole positions in the lower chamber, do not use them wrong to prevent the suction holes from being blocked, causing failure to stretch or incomplete stretching!
This phenomenon is mostly caused by the offset caused by the loosening of the cross-cutting knife fixing nut. You need to re-center and adjust the corresponding packaging seal, and then tighten the fixing nut.
If the longitudinal cutting knife cannot cut or burrs occur, the reasons are: (1) The blade edge is passivated or the edge is rolled and chipped, and it needs to be removed for repair or replacement; (2) The clearance between the upper and lower knives is too large, the fixing screw of the blade holder should be loosened, adjust the clearance to about 0.3-0.1 mm, and then tighten the fixing screw.
After the machine has been used for a period of time, the chain may become loose, causing the film clip opening to be too small to clamp the film or the film clip to fall off, and it needs to be adjusted and replaced in time.
There are chain tensioning bolts on the right side of the machine. Use a wrench to evenly turn the bolts on both sides clockwise for a few turns to tension the chain, but do not tighten it too much to prevent damage to the chain and related parts. If this adjustment cannot meet the tension requirements, you can remove a chain link from the chain joint.
If there are damaged film clips, they should be removed and new ones installed in time. If the number is small, you can directly replace them with pointed pliers without disassembling the chain on the machine.
The top film roll and bottom film roll are manually installed on the bottom film roll shaft and top film roll shaft respectively, and are clamped between the two baffles at the lower end of the film pressing link. The installation direction of the top film is generally counterclockwise to the winding direction of the film roll, and the bottom film is clockwise (see attached picture). When you start working with a new bundle of film, pay attention to whether the film runs off and causes the bottom film to be clamped unevenly on both sides of the film clip chain or one side is not clamped, causing the work to be unable to proceed or the top film completely covers the lower vacuum chamber, causing no vacuum. At this time, the front and rear positions of the film roll need to be adjusted. The method is: on the support beam of the link above the top film, there is a fine adjustment handle at the far right of the frame, which is used to fine-tune the film’s deflection. When the handle is swung clockwise, the film roll moves towards the rear of the machine, and vice versa, it moves towards the front of the machine. Slowly adjust until the working requirements are met.
If you find that the sealing is not good, or the vacuum degree is not good for unknown reasons, or the forming is not good, you should check whether the sealing strip is damaged or aging, or the joint is not tight, and the gap is too large. If it is damaged, it needs to be replaced in time. If the joint is too large, it should be reinstalled, or the joint should be bonded and sealed with high-quality silicone.
The photoelectric positioning system consists of a photoelectric switch, a pressure regulating valve, a pneumatic solenoid valve, and a brake, and is controlled by a “API”. When using color-printed cover film, it is used to position the color film so that it accurately corresponds to the bottom film and does not run off. Otherwise, the pattern will be offset on the packaging, which will not meet the requirements for use.
Color film use principle: The bottom film moves forward accurately in a stepping manner under system control. The corresponding color cover film, without being controlled, gradually shifts away from the packaging center after a period of time due to its own stretching and the accuracy of printing, making it unusable. Donc, the movement of the color film must be controlled. If a color mark is printed on the center line of every two adjacent working positions on the color film (this machine uses a 14×6mm black color mark), when the photoelectric switch detects this color mark, the braking system brakes and positions the cover film, and is controlled by the “API” to synchronize with the bottom film movement, so that the packaging requirements can be met. The machine has a pitch of 394mm, and the color mark printing distance is between 392-393.5mm, printed on the sealing strip in the middle of each adjacent pitch. The attached picture below shows the color mark printing positions for 9 packages with a pitch length of 394 mm.
[Image: Color mark printing positions]
Photoelectric Positioning System Use Adjustment Steps:
Note: During the working process, pay attention not to touch the color film to prevent the photoelectric switch from malfunctioning, which may lead to the failure of the color film being pulled off. When you don’t use color film and switch to light film, adjust the touch screen to the “Light Film Selection” state. (Note: The focal point walking route of the photoelectric switch, that is, the color of the sealing area must be a single color.
1. Fuse tube (1UN) 2. Sealing strip 3. Mold sealing strip 4. Cross-cutting knife silicone strip
Appendix: Machine internal pressure regulating valve parameters
| Nom | Emplacement | Fonction | Value MPa |
|---|---|---|---|
| Sealing Pressure Valve | Middle of electrical box | Sealing pressure adjustment | 0.1-0.2 |
| Cover Film Braking Valve | Left side of electrical box | Cover film braking pressure adjustment | 0.25-0.4 |
| Cover Film Air Expansion Shaft Valve | Right side of electrical box | Air expansion shaft airbag pressure adjustment | 0.35-0.5 |
| Bottom Film Air Expansion Shaft Valve | Rear end inside the machine | Air expansion shaft airbag pressure adjustment | 0.35-0.5 |
| Bottom Film Preheating Valve | Rear left 3 inside the machine | Bottom film heating pressure adjustment | 0.05-0.08 |
CB Series Thermoforming Vacuum Packaging Machine Basic Operation Steps
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