The production process of Paper making rubber rollers

Paper making rubber roller is a large thick walled rubber roller used for various components of paper machines. According to different functions, it can be divided into pressure rollers and various auxiliary rollers driven by pressure rollers. Do you know the production process of paper rollers? Let's learn about it together with the editor.
1. Rubber mixing
Mixing with an open or internal mixer - common in the rubber industry, will not be further elaborated. For functional layer rubber materials with high requirements for roller surface, filtration should be carried out after mixing to remove large particles and some impurity particles that have not been dispersed during the mixing process.
2. Roller shell processing
Sandblasting is used to remove oil and impurities from the surface of the roll shell of Paper making rubber rollers, increase the specific surface area of the roll shell, and enhance the contact strength between the roll shell and the substrate compound. Some traditional methods involve cutting small grooves on the surface of the roller shell to increase the bonding strength between the roller shell and the matrix compound. This method is no longer used at present. For the casting roller body, due to the poor density of the roller body, oil stains during the casting process will remain inside the roller body. Before sandblasting, the roller shell should be placed in a vulcanization tank for baking (such as 120 baking for 12 hours). After sandblasting, the surface treated roller shell is coated with homemade or purchased adhesive, and can be sealed after the adhesive solvent has completely evaporated.
3. Glue wrapping
A more advanced packaging method is automated extrusion encapsulation. Clamp the roller shell onto a rotating device (such as a lathe), extrude a certain thickness and width of rubber strip with an extruder, and wrap the rubber strip around the roller shell at a certain angle or overlap ratio. According to the usage environment and function of paper rollers, the coating can adopt a single-layer structure, a two-layer structure, or a three-layer structure (different grades of rubber have different properties). For multi-layer structured paper rollers, the hardness of the rubber material gradually becomes softer from the inside out. In Europe, there is a special rubber coating structure where the hardness of the inner layer is softer than that of the outer layer - this special structure of rubber rollers is prone to breakage when impacted in cold environments. General rubber compounds can be produced by extrusion and packaging, but for some special rubber compounds that are not suitable for extrusion or have very soft hardness, manual packaging technology is required. That is, the mixed rubber compound is pressed into a thin film of a certain thickness and width on a rolling machine, and then wrapped layer by layer on the roller shell until the desired thickness is reached. After packaging, wrap a layer of soft paper on the surface of the adhesive material, and then wrap two or more layers of nylon water cloth.
4. Sulfurization
The vulcanization of paper rollers is generally carried out in a vulcanization tank, using segmented heating, low temperature, and long-term methods. According to the size of the rubber roller and the characteristics of the rubber material, the vulcanization time ranges from ten hours to sixty or seventy hours.
The above is the process of producing Paper making rubber rollers. Then, the processed vulcanized rubber rollers need to go through machining processes such as turning, grinding, drilling, and slotting. Then, it can only be delivered to the customer after undergoing visual inspection and dynamic balance testing.
Editor: Chihiro