The transfer rubber roller is the most critical rubber roller for solvent-free compounding. Compared with the coating rubber roller and the compound rubber roller, what specific requirements does it have? This column is explained in detail.
(1) The transfer rubber roller needs to change with the width of the substrate (coating width) and needs to be replaced frequently, so its quality and adjustment also require more attention.
In solvent-free compounding, when the product is changed (referring to the change in coating width), the corresponding transfer rubber roller needs to be replaced, and the coating rubber roller and the compound rubber roller do not need to be replaced. There can be as many as dozens of rubber rollers in one machine, and there are 2 to 3 coating and compound rubber rollers.
(2) In addition to the two-way positive pressure from the transfer steel roller and the coating steel roller, it also has to withstand the surface shear force due to the speed difference, so its elasticity and shear strength are higher.
Another important feature of the transfer rubber roller is that it can adjust the speed during the operation or adjust the speed difference with the steel roller. Therefore, it often has a serious squeeze deformation state.
Therefore, the shearing, squeezing, friction, and heat deformation of the rubber layer are relatively serious, so the material and performance requirements of the rubber roller are higher and more complex.
(3) The transfer hose is the most important rubber roller that affects the compound speed.
The same machine uses different transfer rubber rollers. The actual running speed can vary greatly. For example, a solvent-free compound machine with a maximum speed of 400 meters / minute can use a good rubber roller to run at full speed (that is, reach 400 meters / minute). However, if a defective rubber roller is used, the maximum speed may only reach 150 m / min or even lower.
(4) The transfer rubber roller is a rubber roller that has a more direct influence on the coating quality.
It is the only rubber roller that is in direct contact with the adhesive for a long time, directly transfers and grinds the adhesive layer, so its defects or deformation directly affect the quality and accuracy of the coating transfer. Note: The defects of the coating rubber roller can only indirectly affect the coating quality through the substrate, which is obviously different from the transfer rubber roller.
Since the viscosity of the adhesive will change continuously during use, it may affect the transfer state of the rubber roller and the transfer rate of the adhesive, and also affect the working state of the rubber roller drive motor.
(5) Both the coating rubber roller and the composite rubber roller have only one positioning reference during operation, which are the coating steel roller and the composite steel roller, respectively, while the transfer rubber roller must be in good contact with both steel rollers at the same time.
In other words, it must find a balance between the two benchmarks (the coating steel roller and the transfer steel roller). This is the fundamental reason why many poor quality transfer rubber rollers will have uneven coating.
(6) The transfer rubber roller is the rubber roller with the most problems in actual use.
The users often need to change the transfer rubber rollers of different specifications during use. However, there are many domestic rubber roller suppliers, the quality is uneven, and the overall price competition is still in the state, which brings a lot of hidden quality problems for users. Transfer rubber rollers are often an important source of quality accident disputes between suppliers and users.
It can be said that the quality of the transfer rubber roller represents the quality level of the solvent-free rubber roller, and even characterizes the quality level of the entire printing rubber roller to a certain extent.
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