Roll press can refer to two different machines: a calender that operates by means of rollers, or a printing press with a D-shaped roller used in copperplate printing.
In the context of mechanical roll pressing systems, the roll press machine is a fully automated machine that offers features like cleanability, no cross-contamination, small hold-ups, and defined stress. It is designed to fulfill new requirements and can be used for low line forces or accurate roll positioning. There are two different roll designs available: P-Rolls, which have a guided cooling system and are very stiff, and KINTEK rolls, which offer full flexibility for the complete line force range.
The main part of the roll pressing machine is an eccentric shaft. The eccentric shaft allows for a high accuracy of the distance setting between the roll shafts (gap setting) by multiplying the force about 20 times. This means that even with a low force applied in the roll pressing, there will be a very high pressure between the rolls. Pneumatic systems can be used instead of hydraulic systems because of this high pressure. A pneumatic step motor is used to change the angle of the eccentric shaft, which in turn changes the distance between the roll shafts and the gap between the rolls.
In a lab two roll mill, the working principle is as follows: with the rotation of the rolls, the raw materials and additional components placed between the two rollers are dragged into the roll gap and subjected to intense squeezing and shearing. This deformation increases the contact area between the compositions. When the stress applied to the materials exceeds the allowed limit, the internal macromolecular chains of the materials are stretched and broken, resulting in further spreading and uniform mixing. This process is repeated until the desired compound is obtained in a sheet shape and the expected mastication or mixing state is reached.
Similarly, a three roll mill or triple roll mill is a machine that uses shear force created by three horizontally positioned rolls rotating in opposite directions and different speeds relative to each other. This machine is used to mix, refine, disperse, or homogenize viscous materials. The three-roll mill has proven to be the most successful among the range of roll mills developed in the 19th century. It allows for larger agglomerates as part of the input material compared to the single-roll mill, but is more complicated and expensive.
In summary, roll press refers to either a calender or a printing press with rollers. In the context of mechanical roll pressing systems, it is a fully automated machine used for various applications. In a lab two roll mill, it is used for intense squeezing and shearing of materials to achieve the desired compound in a sheet form. In a three roll mill, it is used to mix, refine, disperse, or homogenize viscous materials.
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