-The guide to vertical form fill seal machines
As a popular packaging machine, the vertical form fill seal packaging machine is used in a wide range of industries, do you know how it works? How he is from the film into a bag, and how the material filling and sealing? Today you learned VFFS machine, let us know his principle, in packaging learning road less detour.
1. Packaging material measurement
First of all, packaging machines by the lower material institutions to the material concentration and measurement of the part. The feeding mechanism is generally composed of a storage hopper, multi-position measuring cups, feeding opening and closing, measuring cups, and other components. Materials from raw materials to complete the proportion of the workshop transported to the storage hopper, through the measuring cup or linear weighing equipment such as weighing in the next step.
2.Film pulling
You can see from picture one, that there is a film supply system in the VFFS machine, it puts the roll of film through the photoelectric detection and releases the film mechanism to control the film pre-storage, to ensure that the film in the traction molding composition to maintain a constant tension, the corrective structure of the film in the transmission process does not run out of shape, to ensure that traction molding is carried out smoothly. Generally, we choose the roll film is in line with the flexible packaging materials, a variety of plastic films or coatings including LDPE, HDPE, EVA, PP, PVA, PVC, PVCD, PC, PET, and so on the combination of packaging film.
3. Bag making
The bag-making process requires the use of the membrane traction control principle. The membrane traction molding mechanism is mainly composed of the turnover of the collar molding machine, the membrane traction transmission mechanism. The lapel former is a more mature former, according to the different sizes of the package, replacing different models of the former. The servo motor drives the traction mechanism, together with the color-coded detection photoelectric switch, to ensure the accuracy of bag-forming traction.
4. Length setting
Generally, there are 2 types of bag length settings in vertical form seal machines: stepping motor drive and servo motor drive. Because of different packaging needs, you can choose different motors as the drive according to your needs. When the bag length is determined, the cutting position should be according to the integer times the bag length in the middle of the cross-sealing channel, turn the handwheel, so that the rotary knife cuts the bag exactly in the middle of the cross-sealing channel or cuts off at the color marking point.
Stepping motor drive is the most commonly used drive mode, the working principle is to start traction to the color scale between the PLC does not count, the detection of the color scale of the photoelectric open light detection of the color scale and then counting, fixed-length hauling, to complete the hauling of a bag. The advantages of stepper motor drive is moderate cost, traction is relatively accurate, start and stop frequency is high, can meet the 50bag/min film pulling action. However the disadvantage is that the stepper motor control belongs to the open-loop control, the film traction accuracy is affected by the friction between the traction roller and the film, and the stability is poor.
The other one is a servo motor drive. Servo motor drive is currently the ideal drive system. Its working principle is to haul to the beginning of the color scale between the PLC does not count, detecting the color scale of the photoelectric switch detects the color scale, counting, and fixed-length hauling, to complete the hauling of a bag. The advantages of closed-loop control, hauling relative who is accurate, start-stop frequency is more commercial, can be synchronized with other servo motors, the operating curve, up to meet the 100 bags/min of the film hauling action, and at the same time can eliminate the accumulation of errors. The disadvantage is the high running cost.
5. Unloading
When the VFFS packaging machine is running, you should pay attention to the correct timing of the lower material. Take the pellet as an example to give you an explanation, the heat sealing body just closed when the lower material opened.
Adjustment steps are as follows: first of all, turn off the machine’s main power supply, so that the machine is powered off; by hand toggle the main motor drive belt, so that the shear arm through the heat sealing cam just closed state; the main shaft on the measurement of the pinion upward push, so that the two meshing gears are separated; close the clutch, by hand to turn the large gears, is the clutch jaws are completely coincidental; and then move the pinion downward to the large and small gears will be meshed.
Tips:
a.If the material leaks outside the bag maker when you drop the material, you need to adjust the position of the toggle holder and the toggle.
b.You are not allowed to turn the metering disk clockwise, otherwise it may damage the machine parts!
6. Sealing
The vertical form fill machine sealing mechanism is composed of the vertical sealing of the bag and the horizontal sealing and cutting mechanism. This is one of the more common sealing combinations. The more common is vertical sealing, which can be realized through the use of a mechanical cam or cylinder drive; on the contrary, horizontal sealing and bag cutting is one of the difficulties of the vffs machine, because he affects the packaging machine’s packaging speed and packaging quality. If you want to pack faster or need more than 70 bags/minute, then you need to use a servo motor to drive the cam linkage mechanism, the higher the processing accuracy of the cross-seal surface required to reduce the noise of the packaging equipment in operation effectively.
7. Output
The output of the finished product needs to depend on the weight of your package heat sealing temperature to add a buffer plate. Because the vffs machine is vertical packaging, heat sealing after the incision of the soft, plus your material is too heavy, fall down when it is easy to punch through the bag, our various models of vertical packaging machine are equipped with the bottom of the bag.
Our vertical form fill seal machines solutions
Our vertical form fill and seal machine is an automatic form fill and seal machine for different industries and materials, whether it is granule, powder, liquid products, chemical, medical, agricultural products, he can solve packaging problems, among which our best is to pack dry loose granular materials, such as spices, melon seeds, tea, desiccant, monosodium glutamate, sugar, etc.. , white sugar and so on.
If you are not sure whether your products can be packed with vffs machine, you can send your product information, we will provide you with your own packaging equipment.
