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Solvent-free compounding has been rising rapidly in China in the past few years from 2010 to 2013. The author believes that it will be faster in the future because of solvent-free environmental protection and energy saving. Solvent-free compounding has some misunderstandings about it in some domestic enterprises. It is believed that the solvent-free compounding is not fast enough to be cooked. The effect of making aluminum and pure aluminum materials is not good, or it is not practical to produce on this equipment without large orders. These understandings are wrong, as far as single environmental protection is concerned. Now that food requirements are so strict, you can get a guarantee on residual solvents. Secondly, the energy saving of the equipment, without an oven, which can greatly reduce electricity costs, so I think the trend of solvent-free compounding is promising.
1. Cost of solvent-free compound machine
1. Equipment can't bring costs, glue can't bring costs, the only thing that can bring costs to the enterprise is personnel, so personnel is the best cost control of an enterprise, and it will be a considerable cost if used properly. The equipment brings energy saving, the glue brings no solvent, the personnel brings money, quality, efficiency and cost control;
2. The cost of the solvent-free laminating machine is much lower than that of the dry laminating machine. If the operation is correct, the amount of glue is more cost-effective than the dry laminating machine. There is no need for solvent dilution and no electricity for the oven, followed by ordinary production. The structure product is higher in speed than the dry compound machine and can reach a speed of more than 300m / min . On the contrary, if the personnel is improperly operated or the responsibility is not enough, 300m / min can bring efficiency and loss, so the personnel cost is the best Cost control.
Second, the scope of solvent-free compound adaptation
1, substantially solvent-free structure can be adapted to most complex, depending on the operator and auxiliary materials and methods and processes of your operation. The two types of VMPET and AL should be of great concern to everyone. This depends on your product. The color, performance, and material of the printing plate also have an important point to see how your operators operate. Some domestic companies have matured. Some companies have frequent problems, which depends on your method. For now, domestic use of solvent-free composites has been used for 121 ° C cooking products, boiled products, aluminized composites, pure aluminum composites, inflatable bags and other structures, which can prove that the scope of application of solvent-free composites is still relatively wide.
2, is not suitable for solvent-free clear ink, the yellow ink think When the composite color slightly worse results without a solvent.
3. Compatibility of solvent-free glue and ink;
1, how to judge is incompatible ink and glue?
Said ink generally appear incompatible with glue claim transducer under test ink manufacturers are more glue, but white spots generated when such problems are mostly solvent-free compound (in particular, when the composite VMPET) occur, bubbles, No fastness etc .;
When this happens, let's analyze it first. Let's first see whether the white point is full or partial. Is there regularity? What are the bubbles and the fastness? See if the operation process is correct, such problems will occur in speed, gluing, etc. Generally, the composite aluminum plating material will have some white spots, but this does not mean that it is incompatible, and the cost of a company's ink replacement is wasteful and troublesome. The most efficient problem is the sample to solve it.
Under the condition that the base materials are replaced and compounded separately, the speed identification should be done. Without considering other factors, the amount of glue, temperature, and pressure in all aspects should be controlled, so that the sample can analyze the problem again. There is also a possibility that the ink is lighter, the dots are too shallow, and the residual solvent of the ink is volatilized cleanly (you can pass a rewind before compounding, blow it down with a fan when rewinding, or put a small amount into the solid state In the room drying, the compounding is performed to see whether the effect is the same as before). Secondly, the compound test can be performed on the dry and complex, so that it can analyze the problem in which link, and then solve the problem, which can save time and effectively solve the problem for the enterprise. , No need to spend a lot of time to replace different ink compound.
Fourth, if the solvent can be done without boiling, steaming; what factors need to have;
 a . The nature and structure of the product;
b . What is the sterilization process and temperature of water and cooking?
 c . What are the contents? Does it contain media?
 d . Is the glue resistant to boiling, cooking, and media?
 e . Control of glue quantity and speed;
 f . Is the substrate boiled or steamed?
According to the above points, choose the materials, glue, process order, etc. you need to produce, which can reduce unnecessary bends and losses;
Fifth, the solvent-free composite bubble generating bubbles of the joint;
The generation of bubbles without solvent is very simple and easy to solve. Generally, if bubbles appear, let ’s look at whether the bubbles are regular or irregular. If the bubbles are regular, consider the rubber roller. If the bubbles are irregular, consider whether the amount of glue is sufficient and the air pressure is insufficient. 〠The leveling of glue is not good, temperature control, residual solvent of printed composite film , too fast speed, etc. will produce bubbles. In this case, according to the bubble sample to solve, increase the pressure, control the amount and speed of glue, you can add points Temperature, this can solve the appearance of bubbles. In general, normal air bubbles can be solved by the above possibilities and these solutions. If bubbles appear in the anti-counterfeit label on the similar salt bag in winter, the solution must be solved according to the sample.
During the compounding process and the shutdown of the feeder, bubbles appear when the tape joint is turned on (may not be seen by some manufacturers). When the bottom film is PE , the thickness of more than 5 wires will cause this situation. The author only explains how to solve it. It is also simple to say, but some manufacturers will not solve it. Generally, a large area of ​​bubbles is generated through the joint. The operator uses a knife to cut and tie. This is dangerous operation and waste during the operation process. It is very simple to solve this. when the tape can be attached to the positive and negative material, is affixed with bubbles, anti-paste production of composite bags will feed off, not only can solve the pros and cons attached to bubbles and ensures the continuous bag material, better, more complex loss and loss bag less. Due to the angle of the compound press roller of the compound machine and the joint bubble caused by the advanced compound press roller at the tail when the tape is being applied, the effect of sticking on both sides is the best and the waste is least.
Six knife line, and the occurrence of bare gum solution;
Everyone should be aware of the occurrence of the knife line and often encounter it. The knife line generally refers to the presence of impurities, dust, particles, etc. in the glue. Everyone knows how to solve it. Basically, it can be solved by adjusting the blade roller.
But there are two possibilities for empty glue, one is similar to the situation of the knife line. There are impurities and dust particles in the rubber roller, which causes the glue to be scraped down. Another possibility is on the transfer steel bar. The grooves of the wire groove are deep, and the prints on the steel rod are generally worn to the depth with impurities and hard objects. One is the position where the pressure roller and the baffle are rubbed at the commonly used specifications. , It is easy to transfer without glue on the wider composite material, this situation depends on the quality of the transfer roller, surface treatment and the material of the baffle. When placing the baffle, apply some curing agent to the inside of the baffle, so that Reduce friction.
VII Summary
Personnel is the cost, and the cost of the personnel can be controlled; the product performance must be understood; the basic understanding of materials, glue performance and equipment; the life time of the glue when it is stationary; the habit of cultivating the habit of first sample inspection; Make process parameter records for each product; control and measure the amount of glue; do not oversimplify simple thinking; do not directly negate without testing; learn to analyze, test, eliminate, record when problems occur Wait, don't blindly draw conclusions; practice truth, don't rely on theory or data to solve problems.
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