Warm Global Customers
With China Plastic Machinery
With China Plastic Machinery
Bag making machine is a machine for making various plastic packaging bags or other material packaging bags. Its processing range is various sizes, thicknesses and specifications of plastic or other material packaging bags. Generally speaking, plastic packaging bags are the main products.
This machine is specially designed as a dual-purpose machine for point-break continuous roll flat bags and point-break continuous roll vest bags. Computer control and stepping (servo) fixed length system are used to reduce the size error of sealing and cutting. The electric eye tracking device makes the pattern position of the printed bag accurate. The computer numerical control can be selected to adjust the bag length. If there is a problem with the printed bag, the machine will automatically stop and issue a warning sound.
Garment bags refer to bags made of OPP film, or PE, PP, CPP film with non-adhesive film at the entrance and sealed on both sides.
Application:
We generally use it widely to pack summer clothing such as shirts, skirts, pants, socks, towels, bread and accessories. Usually this kind of bag has a sticker on it, and it can be sealed directly after the product is put in. This kind of bag is very popular in the domestic market and is widely applicable. Due to its good transparency, it is also an ideal choice for packaging gifts. This kind of bag is in great demand in Guangdong, especially in garment processing factories, fabric wholesale markets, small commodity wholesale markets, and the food industry. In summer alone, a small-scale garment factory generally needs at least 1.5 million pieces. If a pattern is printed on this bag, its transparency and clarity are incomparable to other plastic bags, which makes a powerful publicity for the company in promoting its brand.
Features:
1. Frequency conversion speed regulation
2. Automatic waste edge removal function
3. The machine control adopts a computer digital system: fast speed, accurate size, stable operation
Technical parameters:
In order to prevent the synthetic resin from being decomposed and damaged by light and heat during processing and use, and to extend its service life, stabilizers should be added to the plastic. Commonly used ones are stearates, epoxy resins, etc.
5. Colorant"}]}]},
Colorant can make plastics have various bright and beautiful colors. Organic dyes and inorganic pigments are commonly used as colorants.
6. Lubricant
The function of lubricant is to prevent plastics from sticking to metal molds during molding, and at the same time make the surface of plastics smooth and beautiful. Commonly used lubricants include stearic acid and its calcium and magnesium salts.
In addition to the above-mentioned additives, flame retardants, foaming agents, antistatic agents, etc. can also be added to plastics to meet different usage requirements.
Main technical parameters:
Maintaining constant material tension and accurately controlling tension fluctuations are important factors in improving production efficiency and controlling bag quality. Tension detection is the basic premise of tension control.
Traditional bag making machine tension sensors have two types: direct measurement and indirect measurement. Direct measurement has seat-type tension sensors, For example, the excitation coil and secondary coil of the piezomagnetic tension sensor are composed of an excitation coil and a secondary coil. The secondary coil is an inductor. When the magnetic element is subjected to mechanical stress in the measuring direction, a magnetic coupling phenomenon occurs. An induced AC voltage signal proportional to the mechanical force is generated on the secondary coil. Through signal processing, a tension signal proportional to the size of the mechanical force is output; the piezoresistive tension sensor is installed between the bearing and the frame to record the horizontal roll tension. The corresponding amplifier is used to supply the full-bridge voltage and process the measurement signal. The signal at the output end of the amplifier is proportional to the radial force and can be used for digital display or as the instantaneous value of a closed loop; there is also a leaf spring micro-displacement tension sensor. The advantages of direct tension sensors are wide detection range, fast response speed, and good linearity. The disadvantage is that they cannot absorb the peak value of tension. When the tension control system is subjected to strong interference, the system has no time to react instantly, and the amplitude of the tension change on the material belt is large.
The indirect tension detection method is essentially a position control, and the floating roller tension detection is commonly used. When the tension is stable, the tension on the material belt is balanced with the cylinder force, Make the floating roller in the center position. When the tension changes, the floating roller position will rise or fall. The floating roller potentiometer detects the change of the floating roller position, and it will feed back the position signal to the tension controller. The controller calculates and outputs the control signal.
The tension detection method that combines direct and indirect testing can simultaneously detect the floating roller position signal and the tension electrical signal output by the sensor. It has a good buffering and stabilizing effect, and also has the characteristics of high precision and high repeatability of closed-loop control.
There is also a detection method that obtains the tension based on the roll diameter. The speed of the roll is detected by the proximity switch installed at the reel, and the current diameter of the reel or unwinding drum is calculated by cumulative calculation based on the set initial value of the reel diameter and the material thickness. According to the change of the reel diameter, the control signal is output to control the reeling torque or unwinding brake torque, thereby adjusting the tension.
During the transmission process, the horizontal position deviation of the material may occur due to various reasons such as uneven force, uneven thickness, and roundness of the traction roller. Online deviation detection should be carried out in a timely manner.
The speed of the early bag making machine was not high, and the deviation of the material was manually adjusted by the operator based on the actual observation on site.
Because the photoelectric sensor has the advantages of simple structure, reliable performance, high precision and fast response, the photoelectric sensor is now used to track the boundary line of different chromaticity zones on the edge of the packaging material, read the offset between the actual position of the strip and the set position, convert the offset into an electrical signal, amplify it, compare, calculate and analyze it, and then send a command to the servo controller to control the motor to drive the deviation correction guide mechanism to return the strip to the set position, so as to achieve the purpose of automatic tracking and adjustment of the conveyor.
1. Preparation before starting the machine
1. Check whether there is dust and debris around the equipment and remove them.
2. Put on the film roll according to the requirements of the production notice.
3. Adjust the size of the bag according to the production notice and process documents, install the heat sealing knife, and preliminarily adjust the position of the slitting knife and heat sealing knife.
4. Turn on the power and set the heat sealing knife temperature according to the requirements of the process documents.
5. Enter the relevant data of bag making and the required number of each bundle.
6. Select the edge of the pattern with large color difference to adjust the sensitivity of the photoeye to the left and right to meet the requirements.
2. Turn on the machine
1. Start the main motor and run it at a low speed. Then adjust the edge control to divide the film in half in the middle position.
2. Adjust the left and right clamping rollers to align the left and right films, and adjust the front and rear clamping rollers to align the pattern.
3. Adjust the heat sealing knife to make it heat-sealed within the required range of the bag.
4. Adjust the slitting blade to the required position and adjust the punching position to the scissor mouth.
5. Preliminarily adjust the machine speed, take a flat sample bag once, and conduct an initial inspection. If it does not meet the specified requirements, take another flat sample bag for heat sealing value test.
6. Sort out the produced bags, and select the bags with quality defects (such as folds, tunnels, flower widths, knife lines, loose heat seals, four seals, etc.) and tie them up according to regulations.
7. The machine quality inspector will inspect them. After passing the inspection, affix the certificate of conformity and send them to the quality inspection room for random inspection.
8. During the production process, observe the bag making situation at any time and make adjustments immediately if any abnormality is found.
III. Shutdown
1. Turn off the main power switch, and then turn off the power switches of each part.
2. Clean the machine and the site, and send the products to the general inspection room.
3. Keep accurate and neat records of the shift.
IV. Packing
1. Packing: The machine staff will sort out the products of this process, select the unqualified products with quality defects (such as folds, tunnels, flower widths, knife lines, loose heat seals, four seals, incomplete patterns, etc.), bundle the qualified products, and hand them over to the machine quality inspector for inspection.
2. Inspection: The machine quality inspector will inspect the quantity and quality of each bundle. After the quantity and quality are qualified, they will be packed into boxes as required and put into the packing list; the selected unqualified products will be placed in cartons with "unqualified" marks.
3. The machine staff will send the products on duty to the appearance quality inspection room.
4. The chief quality inspector will conduct random inspections on the products submitted for inspection according to the specified proportion, and pack them for storage after passing the inspection.
The development of foreign plastic bag making machines is very fast. Since the 1990s, there have been great technical progress. In addition to the increasingly improved various auxiliary functions, production speed and high efficiency are important aspects, especially in the electrical aspect. Microelectronics technology is widely used, so the performance of the machine has indeed made great progress, which is the development direction.
The key to improving the function of the bag making machine lies in the control part, such as the adjustment of the bag making length, the adjustment of the color mark detection, and the increase of the production speed. In the past, it was all adjusted manually. If the length is adjusted, the eccentricity value of the crank mechanism must be carefully adjusted, and then the machine is opened to make bags and the sample length is checked. Repeatedly several times, it is more troublesome. Moreover, due to the intermittent reciprocating motion, the machine vibrates greatly. If a stepper motor is used to directly drive the rubber roller for intermittent reciprocating operation, the number of pulses is controlled through the electrical circuit to control the length of the motor working time. It can deliver a fixed length of film with very small error. In this way, a crank connecting rod mechanism can be saved, and the length can be adjusted conveniently. It can also save electromagnetic clutch, brake or overrunning clutch, as well as complex and expensive electronic control system.
The stepper motor (such as 130BC3100) should be equipped with a stepper motor driver and a dedicated stepper motor controller (such as YXD-2) to concentrate various electrical buttons. In this way, the bag making length and other operation items can be set very simply on the control panel by using a code dial. Such as the machine stop position, material discharge amount (material discharge contact), color mark photoelectric probe switch, machine main switch, welding knife temperature, counter, etc.
The main motor drives the main shaft of the transmission part to rotate. There is a special cam (optical opening disk) on the main shaft, which can provide signals such as starting and stopping the stepper motor. While completing the bag making action (sealing, cutting, conveying, color mark, etc.), the machine works in a coordinated manner according to the various set requirements.
The production speed of this bag-making machine can reach 140~150 times/min, the bag length is ¡Ü1000mm, the bag length error is small, about 0.5~1mm, and it is much more efficient than ordinary photoelectric control bag-making machines.
Since all electrical component controllers are produced domestically, including photoelectric probe switches (such as the photoelectric probe produced by the Sino-foreign joint venture Futai), proximity switches, etc., they are cheap and easy to match. They can be produced by themselves or supplied as a whole set by specialized manufacturers. Such specialized production can provide great convenience for bag-making machine manufacturers, and is also conducive to the improvement of the overall machine level, providing conditions for the development of more new bag-making machines and promoting technological progress.
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