Solvent Resistant Polyurethane Prepolymer is the most widely used elastomer material for rollers. By blending different types and proportions of compounding ingredients, various mechanical properties can be achieved to suit specific applications. The most desirable properties of Solvent Resistant Polyurethane Prepolymer include its toughness, high impingement resistance, shock absorption, and fatigue resistance.

Solvent resistant Polyurethane rollers are cylindrical rollers coated with an Solvent Resistant Polyurethane Prepolymer. The inner roller core, depending on the application, can be susceptible to scratches, dents, corrosion, and other forms of damage. Solvent Resistant Polyurethane Prepolymer provides intrinsic properties that protect the inner roller core, including abrasion resistance and impact strength.

Polyurethane rollers have good chemical properties, especially good solvent resistance to diesel, gasoline, lubricating oil, kerosene, alcohol and saline solutions.Polyurethane needs to have sufficient surface viscosity, because it can ensure good ink transfer and inking properties during the printing process, and its good ink-friendly properties can be printed quality.

The appearance and color are bright, the colloidal surface is fine and smooth, and the colloidal material and the mandrel are firmly bonded.The size of the rubber roller is strictly controlled, and the size will not vary greatly under different temperature and humidity conditions.It can adapt to the high temperature and humidity environment of the printing workshop in the south and the cold and dry climatic conditions in the north.

Application characteristics of solvent resistance polyurethane roller

1.The appearance and color are bright, the colloidal surface is fine and smooth, and the colloidal material and the mandrel are firmly bonded.Strict control of rubber roller size system, the size will not vary greatly under different temperature and humidity conditions.It can adapt to the high temperature and humidity environment of the printing workshop in the south and the cold and dry climatic conditions in the north.

2.The hardness index of solvent resistance polyurethane roller is wide, from SHORE15 to SHORE80, which can meet the requirements of different types of printing machines for the hardness of rubber rollers.

3.The colloid used for solvent resistance polyurethane roller has sufficient surface viscosity, but the rubber rollers have good ink transfer and inking properties during the printing process, and their good ink-friendly properties can improve the quality of printing.

4.Solvent resistance polyurethane roller have good chemical properties, especially good solvent resistance to diesel, gasoline, lubricating oil, kerosene, alcohol and saline solutions.

5.Solvent resistance polyurethane roller have good physical properties. Long-term use of rubber rollers will not harden or age, and they have good tear resistance, rebound performance, and good performance. Therefore, they have a long service life, are easy to store, and long-term storage does not affect the use effect; they can withstand high pressure, high speed, and high humidity production environments.Experiments have shown that the tensile strength of polyurethane rubber rollers is 3 times and 5 times that of rubber rubber rollers; compression deformation and resilience are better; and the service life of polyurethane rubber rollers is more than 3 times that of ordinary solvent resistance polyurethane roller.

6.Solvent resistance polyurethane roller have excellent hydrophilicity, so they can be used as rubber rollers for water and alcohol dampening systems.

7.Solvent resistance polyurethane roller have high tear resistance, so they are resistant to shear.

Physical Properties

Physical Properties
Test Item	Standard Range	Execution standards	Result
Operation Time /min	15--20		18
Hardness/ShoreA	55±3	GB/T 531.1-2008	55
Tensile strength/MPa	>13	GB/T 528-2009	18
100%Modulus/MPa	1--3	GB/T 528-2009	2
300%Modulus/MPa	2--5	GB/T 528-2009	3
Elongation at break/%	700--1000	GB/T 528-2009	820%
Tear strength/KN/m	>30	GB/T529-2008	40
Impact rebound/%(25℃)	40--60	GB/T 1681-2009	45
Compression set/%(20%×24h×75℃)			20

The manufacturing of a polyurethane roller is a straightforward process that includes fabricating the roller core, balancing, blending polyurethane, bonding, building, curing, machining, and quality testing. This process is similar to that used for other types of rubber rollers. The key difference lies in the cover-building stage, where the polyurethane resin is in liquid form.

Roller Core Fabrication and Preparation-Steel is the most common type of material for making roller cores.

Roller Balancing - A roller core can become imbalanced in two ways: static and dynamic imbalance. Static imbalance is described as the roller rolling to its heavy side when made to rotate freely. Dynamic imbalance is the generation of a rocking motion or vibration when the roller is rotated to its operating speed.

Polyurethane Preparation-

Product Model	55A	1025R
Appearance	Tawny liquid	Yellow viscous liquid
Viscosity 85℃/MPa.s	300-500	2000-2500
NCO%	--	2.5±0.2
Process Requirement
Ratio B：A	100︰20
B Prepolymer Temperature/℃	85
A Chain extender Temperature/℃	60

Bonding - Bonding is the process that involves adhering the rubber cover to the surface of the roller core. It is done by using a chemical bonding agent that strongly adheres to the outer surface of the roller core.

Curing and Cooling - Curing is the process of creating cross-links between the chained molecules of elastomer compounds.

Machining - This process smooths the surface of the cast polyurethane rollers by removing protruding areas and flashings.

Polyurethane Compound Quality Testing - Most large-scale polyurethane roller manufacturers have in-house testing capabilities to monitor the quality of cast polyurethanes on their roller products. Polyurethanes are tested to evaluate their basic properties, such as hardness, abrasion resistance, and tear strength. Other test methods are utilized for more specific applications, such as accelerated aging and heat resistance tests for high-temperature applications.

Packing

The production of Solvent Resistant Polyurethane Prepolymer is controlled by DCS system, and packing by automatic filling machine. Package is 200KG/DRUM Or 20KG/DRUM.