The solvent-less lamination machine has five basic characteristics of “three lows and one high” (that is, low coating amount, low initial tack, low operating temperature and high speed), and on-line adhesive mixing. So, what is the difference between a solventless compounder and a dry compounder?
Compared to dry lamination processes, solvent-free compounding has the basic characteristics of “three lows and one high” (ie, low coating amount, low initial tack, low operating temperature, and high speed). In addition, on-line dispensing is another basic feature of solvent-free compounding. In this way, we can attribute the no-solvent compound to the five basic characteristics of “three lows, one high and one online”.
Correspondingly, many differences between the solvent-free compound machine and the dry lamination machine also correspond to these basic features, and are mainly reflected in the following aspects:
1. The automatic glue mixer is the core component of the solventless composite machine, but there is no similar device in the dry lamination machine.
The automatic glue mixer completes the on-line transportation and automatic mixing of two-component adhesives. It is the most important protection device for solvent-free processes. We call it the “heart” of solvent-free composite machines. Because of the automatic on-line dispensing, the solvent-less lamination machine must have corresponding interfaces and supporting components (such as glue-moving devices) and control functions.
The glue of the dry lamination machine is basically an off-line manual operation. On the whole, there is no concept of on-line automatic compounding.
2. The multi-stage drying system and the cooling device are the basic components of the dry lamination machine, and there is usually no similar device for solvent-free compounding.
The most common two-component adhesives are solvent-free using a normal temperature coating and compounding environment. There is no drying system and there is usually no cooling device.
In dry compounding, multi-stage independent temperature controlled drying systems and associated cooling devices are the basic components.
It should be pointed out that, due to the rapid expansion of the use of the range and substrate, the use of solvent-free single-group adhesive has increased in recent years, its coating and composite temperature is higher (such as 80 ~ 110 °C), accordingly, the cooling device is often Adopted. However, as a whole, the proportion of such composite machines is still relatively low.
3, coating unit structure and coating amount control methods are different.
In this regard, there is a big difference between solventless and dry laminators.
The solventless compounder uses a multi-roll transfer coating structure, and the dry compound uses a gravure coating and other coating structures.
Correspondingly, the amount of coating (commonly known as the amount of glue and the amount of glue applied) is completely different. Multi-roll transfer coating mainly depends on the speed difference to control the amount of coating, while gravure coating mainly depends on the number of screen wires ( Or the dot area rate and the cell volume) to control the coating amount.
The former can achieve digital control, while the latter can only do analog control. The former can be arbitrarily adjusted on-line, while the latter can basically only be changed by the number of coating roller lines. Once the number of screen lines is determined, the coating amount is virtually constant.
4. The actual operating speed range is obviously different.
Solvent-free laminators have a common operating speed of 250 to 500 meters/minute, and individual speeds of up to 600 meters/minute. The dry laminator usually operates at a speed of 120-200 m/min. For speed alone, dry laminators are a low-speed machine compared to solventless laminators.
This multiplied speed gap is not merely represented by numbers, but it includes the solvent-less lamination machine in terms of machining precision, assembly accuracy, roller axis rigidity, safety considerations, vibration and noise processing, etc. There are major differences.
5, some functional unit structure and different parts of the heavy.
Due to different uses and models, the specific structures of some of the same-name units in solvent-free laminators and dry laminators are different, and there are differences in the requirements for many heavy-duty components, such as:
In the unwinding and winding structure, the solventless laminating machine usually adopts single-station unwinding and winding, and the dry laminating machine is basically a duplex machine.
The key points of the combined upper and lower parts of the multi-stage independent tension control system are different. The greatest focus of the solvent-free compound machine tension system is the control of the winding tension (ie, the tension of the compounding to the winding section), while this section of the dry lamination machine is not so critical. .
There are also differences between the two types of laminating machines. In dry compounding, there are coating rollers and composite rollers. In the solvent-less lamination machine, in addition to the coating of the rubber roller and the composite rubber roller, there is a more important and unique rubber roller that is the transfer roller.
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