Ban on upper and lower films
The ban on upper and lower sheets refers to the question that the front and back sides are not aligned when making the bag
1. Factors
The thickness of the composite film is uneven, with lotus leaf edges.
The tension of the double lifting roller is too small.
Some rollers do not rotate smoothly.
2. Solution
Check and adjust the relevant guide rollers (such as compensation rollers, offset rollers, etc.).
Adjust the tension of the double lifting roller.
The cover has spots and bubbles
Varieties and bubbles on the cover mean that the sealing surface is not flat
1. Factors
The heat-sealing knife or heat-sealing silicone pad is uneven.
When heat-sealing is performed on a material structure rich in hygroscopicity such as nylon film, air bubbles will occur when the hygroscopic film absorbs moisture.
Lack of heat sealing pressure.
Use one-component adhesives, such as neoprene adhesives, when heat sealing the bag. The hot cover can easily show uneven pits.
2. Solution
Replace the binder.
Check or adjust the heat sealing knife and heat sealing silicone pad.
Keep the raw materials and semi-finished products properly to prevent them from absorbing moisture.
Scale error
1. Factors
Operating factors, such as improper tension control, lack of pressure setting of the pressure cylinder of the film rubber roller, etc. Electric eye tracking is forbidden. The influence of plastic composite film bag processing speed. The bag length fixed-length system of the bag-making mechanism is too bad.
2. Solution
Decrease the bag making speed, and adjust the bag making speed slowly.
The pre-adjusted film feeding length (when adjusting the white bag) and the actual bag size should be as accurate as possible.
Check whether the compression degree of the compressed film ruler and the friction coefficient of the composite film are appropriate.
Adjust the pressure of the film rubber roller, the cylinder pressure and the tension of each part.
Check whether there is a cursor printing question or distance question, and adjust it.
Adjust the fixed-length system.

China is a big country in the production and consumption of international packaging. The proportion of plastic packaging and paper bag machine packaging in the total output value of the packaging industry has exceeded 30%. It has become a new force in the packaging industry, in food, beverages, daily necessities, and industrial and agricultural production. Plays an irreplaceable effect. In recent years, packaging products and packaging materials for the plastic packaging and paper bag machine packaging professions have increased steadily, and new packaging materials, new skills, new skills, and new products have continued to emerge.

The gluing position of the paper bag machine is on the spine and the side, and the hot melt adhesive used is also different. For example, the performance of the two is also different, and the hot melt temperature is different. It is necessary to grasp the proper quality of gluing and gluing Important, if the temperature of the melt is too high, the melt will be too thin and the viscosity will be insufficient. If the temperature of the melt is too high, the glue will be too thick to penetrate and flow, and some will appear as small granular blocks attached to the ridge or side. The cover will be wrinkled and hollow on the surface. It is worth mentioning that at present, the performance of hot melt produced by different manufacturers is not the same (we have this experience from actual use). Take the hot melt temperature of the hot melt adhesive used in our factory as an example, there are The side glue temperature is 120℃, the spine glue hot melt temperature is 135℃, and some side glue hot melt temperature is 180℃, and the spine glue heat is 200℃. Therefore, it is necessary to master the appropriate process parameters according to the properties of the material in use to ensure the quality of the glue. Normally, after gluing, the width of the side glue covering is 4mm~5mm. The spine glue can penetrate and fill the milling groove. If the glue is uneven, the glue is too thin, and the pallet of the cover paper bag machine is not replaced as required (or the height is adjusted appropriately), the book after the plastic bag is prone to empty ridges and wrinkled backs. This is something that must be controlled and inspected during the plastic packaging process.
The finishing work before the glue bag of the paper bag machine is a process that cannot be ignored in the whole process of wireless glue binding. If the paper bag machine enters the plastic bag after the finishing process is not completed, then the plastic bag will have many kinds of poor quality problems such as peeling, loose pages, empty ridges, and wrinkled ridges. Sorting is to bundle the semi-finished book stickers, put a certain number of book stickers on the strapping machine, fasten the two ends with plates, start the strapping machine, compact the loose book stickers and then tie them with rope. In order to make the back stiff and firm after compaction, after compacting and binding, paint the back of the book with polyethylene glue once again. After the applied polyvinyl alcohol glue dries, loosen the rope, and then Separate each book into a plastic bag.
In perfect binding, milling and finishing is a key process. The milling back should be determined according to the thickness of the paper sheet and the number of folded layers. Generally, it should be milled away from 1.4mm to 3mm, and the roughening depth is required to be 0.8mm to 1.5mm. If the depth of milling and roughing is not enough, it will inevitably affect the penetration of the glue, resulting in quality defects of peeling and loose pages. In the paper bag machine, in the finishing process before the plastic bag, if the book stickers are not smashed, bundled unevenly, and not compacted, they are transferred to the milling back. Then the semi-finished product with this quality defect must be the book back after being clamped by the book clip in the plastic bag machine. Unevenness, the milling cutter cannot mill, and the book back roughening depth is not enough. The above-mentioned quality defects of glue impermeability, peeling, and loose pages must exist. Therefore, if peeling and loose pages are found in the quality inspection after the plastic bag, while checking whether the milling and roughing depth is appropriate, check the semi-finished product processing of the collating, binding, and compacting processes of the plastic bag. Quality situation.

1. Deal with problems proactively. It is assumed that there is an active diagnosis and treatment system for defects. The implementation of this function can reduce the time for cleaning defects, labor costs and personnel training costs, and reduce some cases where operations are suspended due to small defects.
2. Strong interconnection. It is necessary to be able to conveniently and quickly end the communication between the single machines, so that the single machines are connected into a whole line, and also to conveniently and quickly end the single machine or the whole line and the upper monitoring system to end the monitoring, accounting and analysis of the packaging line power, power consumption and other policies. foundation.
3. Safe, energy-saving and environmentally friendly. This includes maintaining the personal safety of equipment operators and commodity consumers to the utmost extent, reducing power consumption as much as possible, selecting appropriate skills, and minimizing the impact of the production process on the environment.
4. High-precision, high-speed and efficient production and distribution. The equipment can not only operate at high speed and stably, but also reduce the time of abnormal production as much as possible. This is the most direct method of traveling power.
5. Increased flexibility. You can change the type and packaging method of the packaged goods by simply using the information of the order and simply operating the same packaging machine. This function is very useful for small batches and various types of market demand.

Step 1: Ask the user about the fault of the paper bag machine.
The second step: According to the user's paper bag machine fault description, analyze the factors forming such faults.
The third step: open the repaired equipment, admit the damaged equipment, analyze the feasibility of repair and rehabilitation.
The fourth step: According to the working position of the damaged equipment, read and analyze the operating principle of the circuit to find out the factors of the damaged equipment.
Step 5: Contact the customer, submit a repair quotation, and seek user repair opinions.
Step 6: Look for relevant equipment for replacement.
Double Channel Continuous Roll T-shirt Bag Paper Bag Machine
1. Cutter: It is the most important part of the system. It uses movable knives and sliding guides. The floating tissue is compressed by a tension spring. The upper and lower knives can be adjusted. A conditioning screw is set in between, which can be used to adjust the tightness of the cutting knife and can excellently remove the phenomenon of difficult-to-cut materials.
2. Bag-making length regulator: The bag-making length is adjusted by changing the position of the connecting rod sleeve on the migraine carriage to control the bag length, and the bag-making size is adjusted by the elastic hand wheel and the nut.
3. Overrunning clutch: Sinoplastic overrunning clutch is the most important part of this machine. Its quality and function directly affect the error of product length. However, due to the high frequency of operation, its life span also has a certain limit during use. If there is an error in the length of the bag during the production process (usually after half a year of continuous production), and other problems cannot be resolved after removing other problems, the clutch can be disassembled for inspection and repair.
4. Adjustment of the interval between welding wire and cutting line: The interval between welding wire and cutting line is usually 5-10mm. Roll the handwheel on the adjustment frame to make the beam roller rise or fall at a certain interval to obtain the ideal cutting line. In order to facilitate the investigation of the quality of the welding wire, the welding wire orientation of the single bottom wire can be adjusted to the outer end of the machine cutter. If the welding line and the bottom line are not parallel, loosen the fixing screw of a bevel gear and roll the hand wheel to increase or decrease one end of the beam roller; after the production is stable, tighten the screw of the gear.
5. Adjusting method of welding knife: put a piece of thin paper on the supporting seat, roll the big hand wheel in the body box by hand to make the welding knife at the bottom dead center, loosen the nut, adjust the nut, and try to pull the two ends of the thin paper by hand The degree of compaction until approximately equal. After the adjustment, the nuts must be tightened to prevent loosening.
6. Active light-controlled feeding equipment: This equipment is composed of a servo motor, a feeding rubber roller, a light-controlled shutter, a blind, a photoelectric tracking machine and an electric control line. Its function is to insist on normal film feeding during the production process. When the machine is working, when the film feeding speed is too fast and the light-controlled ray is blocked, the equipment will issue an instruction to make the motor stop rolling feeding.
Preparation materialsedit
1. Varieties of plastic bags
(1) High pressure polyethylene plastic bag
Plastic film paper bag machine
Plastic film paper bag machine
(2) Low-pressure polyethylene plastic bags
(3) Polypropylene plastic bag
(4) Polyvinyl chloride plastic bag
2. The use of plastic bags
(1) Uses of high-pressure polyethylene plastic bags:
A. Food packaging: pastries, sugar cubes, roasted seeds and nuts, biscuits, milk powder, salt, tea, etc.;
B. Fiber packaging: shirts, clothing, knitted cotton products, chemical fiber products;
C. Daily chemical products packaging.
(2) Uses of low-pressure polyethylene plastic bags:
A. Garbage bags, bacterial seed bags;
B. Convenient bags, shopping bags, handbags, vest bags;
C. Fresh-keeping bag;
D. Woven bag inner bag
(3) Uses of polypropylene plastic bags:
Mainly used for packaging textiles, knitted cotton products, clothing, shirts, etc.
(4) Uses of PVC plastic bags:
A. Gift bags;
B. Luggage bags, needle cotton packaging bags, cosmetic packaging bags;
C. (Zipper type) document bag and information bag.
Second, the composition of plastic
The plastic we usually use is not a pure substance, it is made of many materials. Among them, high molecular polymer (or synthetic resin) is the primary component of plastics. In addition, in order to improve the function of plastics, various auxiliary materials should be added to the polymer, such as fillers, plasticizers, lubricants, stabilizers, Colorants, etc., can become successful with good plastics.
1. Synthetic resin
Paper bag machine
Paper bag machine (4 sheets)
Synthetic resin is the most important component of plastics, and its content in plastics is usually 40% to 100%. Because the content is large, and the nature of the resin often determines the nature of the plastic, everyone often regards the resin as a synonym for plastic. For example, compare polyvinyl chloride resin with polyvinyl chloride plastics, and phenolic resins with phenolic plastics. Originally, resin and plastic are two different concepts. Resin is an unprocessed initial polymer. It is not only used to make plastics, but also a material for coatings, adhesives, and synthetic fibers. In addition to a small part of plastics containing 100% resin, most plastics require other substances in addition to the primary component resin.
2. Packing
Fillers are also called fillers, which can improve the strength and heat resistance of plastics and reduce costs. For example, the use of wood powder in phenolic resin can greatly reduce the cost and make phenolic plastic one of the cheapest plastics. At the same time, it can also significantly improve the mechanical strength. Fillers can be divided into two types: organic fillers and inorganic fillers, the former such as wood flour, rags, paper and various fabric fibers, and the latter such as glass fiber, diatomaceous earth, asbestos, and carbon black.
3. Plasticizer
Plasticizers can increase the plasticity and flexibility of plastics, reduce brittleness, and make plastics easier to process and shape. Plasticizers are usually high-boiling organic compounds that are miscible with resin, non-toxic, odorless, stable to light and heat, and phthalate esters are the most commonly used. For example, when producing polyvinyl chloride plastics, if you add more plasticizers, you can get soft polyvinyl chloride plastics. If you do not add or add less plasticizers (amount <10%), you get hard polyvinyl chloride plastics. .
4. Stabilizer
In order to prevent the synthetic resin from being differentiated and damaged by the effects of light and heat during processing and use, and to extend the service life, it is necessary to add stabilizers in the plastic guess. Commonly used are stearate and epoxy resin.
5. Coloring agent
The colorant can make the plastic have various gorgeous and beautiful colors. Commonly used organic dyes and inorganic pigments as colorants 6, lubricants
The effect of the lubricant is to prevent the plastic from sticking to the metal mold during molding, and at the same time, it can make the plastic appearance lubricious and beautiful. Commonly used lubricants include stearic acid and its calcium and magnesium salts.
In addition to the above additives, SPC can also add flame retardants, foaming agents, antistatic agents, etc. to meet different application requirements.