As new rubber machinery is very costly today, Pelmar has in its possession used rubber machinery to offer its customers at very competitive prices. Moreover, our immediate delivery times are enabling you to expand your business capabilities promptly.
Ask for further information directly from our Technical Engineers Team.
check out our used rubber machinery supply
Tire & Rubber companies have made a long way in manufacturing capabilities during the last Decades. The necessity to maintain standards in terms of quality and capacity made them to be highly dependent on the availability of rubber machinery.
Each stage in production requires customized rubber machinery which must suit to the application being manufactured in terms of technical aspects and cost-efficiency.
For compounding through primary rubber machinery, Mixer is always a mandatory rubber machine for preparing master batch or final batch which at later stages will be fed into an applicator.
Mixers are available of many types and brands and may differ in wings number and rotors configuration, motor and type of gearbox.
Basically, main differences are found in mixing configuration which is handled by Rotors.
Batch mixer is mostly use in rubber plants. There are two kinds of mixers in this field: "Tangential" and "intermeshing". Intermix is most famous brand with intermeshing rotors configuration and "Banbury" is well known for tangential mixing. In Banbury mixer, rubber is mostly being mixed within the rotors and the wall while in intermix, mixing is mainly carried out between the rotors themselves. Additionally, final batch mix is generally done in Banbury mixer as they are well suited to high viscosity compounds.
Production of the rubber compound used to manufacture the various components used in tire production begins with the process called "mixing" or "compounding". Mixing involves weighing and loading the appropriate ingredients (natural and synthetic rubbers, oil, carbon black, zinc oxide, sulfur, and other company- and tire- specific enhancement chemicals) into an internal mixer. Once the ingredients are transferred into the mixer they are mixed for two or three minutes. The mixer creates a homogeneous mass of rubber using rotors that shear the materials against the walls of the machine's body. Thismechanical action also causes the temperature of the mixed compound to increase considerably.
The mixed rubber compound is discharged to a drop mill, extruder, or pelletizer from the mixer and is processed into slab rubber or pellets. Rubber mixing typically occurs in two or more stages wherein the rubber is returned to the mixer and re-mixed with additional chemicals (typically two “passes” are used for most final compounds). It should also be noted that various rubber compounds produced at a particular facility may be exported to other facilities for use there.
Milling operations, the mechanical process of kneading and rolling rubber compound into a malleable warmed sheet, are conducted to prepare the rubber compounds prior to a process step, e.g., raising the compound temperature or viscosity for extruding. Milling operations ease handling and processing of the rubber compound and homogenizes recycled rubber compounds for reuse in the process. Milling operations occur at various steps in the tire process.
Typically the mill forms the rubber compound into a long sheet of rubber. Additional mills may be located directly downstream from the mixer drop mill to provide additional mixing or handling capability. Pelletizing is a step between mixing and milling used at some facilities to introduce additional uniformity of the compound in subsequent mixing. From the mill(s) or pelletizers the hot, tacky rubber sheet or pellets are passed through a water-based "anti-tack" solution typically a very low solid clay and water mixture (e.g., soapstone) that coats the slab or pellet to prevent the rubber sheets or pellets from sticking together as they cool to ambient temperature. The rubber sheets are placed directly onto a long conveyor belt that, through the application of cool air or
cool water, lowers the temperature. Mixing mill is available in standard sizes: 42", 60", 84" and even 100". Quality of the rolls varies from brand to brand as well as motor and Gearbox configuration.
After coating and cooling the rubber sheets are stored on a pallet or in a bin for transfer to the component preparation areas extruding and calendering) or returned to the mixer for further compounding.
Mills are also used to prepare rubber for introduction to calendering and extruding processes. In these production areas the mills are used to prepare the compound , e.g., heating and viscosity, in order to make the rubber stock more fluid for further handling and processing.
After being processed in the mixing mill, the batch is cooled down in a Batch off, which is an essential utility in the rubber machinery industry and includes a set of rails in which to the rubber is taken and cooled by number of fans.
The extruder transforms the milled rubber into various shapes (i.e., tread stock, sidewall stock) or profiles by forcing it through dies via a rotating screw. Extruders may have multiple heads providing lamination of extruded shapes. Extruding, whether cold or hot extruding, heats the rubber and the rubber remains hot until it is cooled via air cooling or use of a water bath or spray conveyor where cooling takes place. Extruders may be utilized in the mixing area, along with mills to shape mixed rubber compound for further processing.
For those who wish to make rubber products, Calender is a very basic but complex utility that is oriented to use as an applicator. It comes in few sizes and configurations which are set by the application supposed to be formed. This machine is used to make precise applications such as sheets, inner liner and cord / textile plys. Therefore its rolls speed is identical in order to refrain from generating shear stress between plys. The basic rubber machines for feeding a calender is cold feed extruder or twin mill as rubber must be pre-warmed prior to entrance into calendreing line.
Pomini F-370 Used Mixer Body
Gumix 60'' Used Mixing Mill