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Orientation Spin Melting welder

Orientation Spin Melting welder

Product description


Orientation spin melting welder include high quality permanent joints, hermetic seals, lower equipments costs, ease of assembly, energy efficient operation, no ventilation required, immediate handling, entrapment of other parts, far-field welding capability and no additional material requirements


Orientation spin melting welder is a type of frictional welding technology with a circular-axis joint for thermoplastic which is capable for high jointing strength and air-tightness, during spin melting, two plastic parts halves are held by two jigs, one of which is stationary while the other one is rotating in high speed against it under pressure, typically, the rotation speed is 300-1600RPM, the friction by rotation results in heating and melting spin welding area, when melting is ready, rotating jig stops and keep pressing two plastic halves together under pressure to fuse until the molten material re-solidified

The rotation motion can be controlled by electrical motor or pneumatic motor, to meet the co-positioning between two plastic parts halves, spin melting welder can be departed into orientation spin melting welder and non-orientation spin melting welder

Technical parameters





Power output




Power supply

AC380V/50HZ or 220v/60hz

Max rotary speed


Rated torque




Max Diameter




Net weight





With PLC, Convenient to set and read the data

Famous brand Servo-motor for precision orientation

All in one machine, is movable and save room

Melting depth, rotary speed, time, torque are optional

Servo-motor driven can control the melting depth, and orientation  

Product uses

Technology guides


Material is that can be friction (i.e: vibration )welded can also be joined with by spin melting welder, the semicrystalline thermoplastics are more readily joined using spin melting welder that ultrasonic welding, using compatible polymers, spin melting welder is capable of making reliable hermetic seals, for-field welding is easier with spin melting welder that with ultrasonic welding, additional parts can be entrapped between the upper and lower pieces during spin melting weld

Joining of dissimilar polymers is possible using the spin melting welder process although it generally produces lower stretch weld joints, by design the weld joint with an undercut, the polyer with the lower melting temperature will flow into the undercut, creating a mechanical union

Material filler and surface contaminant (e.g. mold release agent) are two factors that will affect consistency and weld repeatability, spin melting welder is more tolerant of contaminants that ultrasonic welding, spin melting welder is also less effected by hygroscopic polymers, although they many still require special handing for critical application, the moisture content can lead to bubble formation in the joint resulting in decreased weld stretch

02: Joint design consideration

021: Part Joint must be on a circular axis

022: Joint design should allow for adequate collapse distance

023: Final orientation of part if necessary

024: If at all possible the upper part would be designed for use with drive features, place for upper tool to grasp the welding parts half

025: The joint area must ne designed so that there is no other part contact interference

KEEPLEADER intelligent assemble solutions offers no charge feasibility study and joint design review of your assembly


There are several primary process control parameters that affect weld quality, there are the surface velocity of the weld joint, press (axial ) speed, weld depth, and hold distance time


For a fixed rotational spin speed (RPM), linear surface speed increases with weld joint diameter, for a fixed weld joint diameter, surface speed increases with motor RPM, smaller diameter parts therefore usually require more FRM that larger parts of the same material, if the surface speed is too low, an adequate amount of head will not be generated to cause sufficient melting, if the speed is too high, excessive heat in the joint could result in material degradation or reduction in viscosity leading to material flow away from the joint

The selection of proper surface speed depends to a larger degree on the material and joint geometry of the parts being welded, some materials, such as PVC, can be readily welded for a wide range of values, while others require a narrow range, commonly quoted values in the literature recommend using


The press speed affects the amount of contact pressure between the parts being welded, which is required to generates frictional heat, the larger the speed. The larger the rate of heat rise, in combination with the surface speed press speed must be high enough to cause melting at the interface as opposed to grinding, but not too high as to damage the parts, excessive press speed can also lead to stalling of the spin motor as more torque is required to maintain constant spin speed


The determination of the proper welding depth is highly dependent on the application, the weld joint is typically designed for a specific weld penetration, ideally, the weld is sufficiently deep to produce a strong hermetically sealed assembly, an excessive depth many lead to the formation of flash (material that is ejected from the joint area during the weld and adheres to the assembly), the drawing out of reinforcing filler material and realignment of the interchain bonds in the weld plane resulting in a weak axial weld joint. And possibly part distortion

Since weld depth affects the joint strength and amount of flash generated, it is important to design the weld joint properly to meet both requirements simultaneously, the incorporation of flash trap features is recommended to produce acceptable appearance without compromising strength

07: HOLD

During the hold phase, vertical press travel initially brings the molten parts closer together (dynamic hold) and then allows the molten material to solidify (static hold), amorphous plastics will normally take longer to solidify that semicrystalline plastic, the dynamic hold distance is typically a small value compare the weld distance, an approximate staring point for initial application setup is 10% of weld distance, the static hold can vary depending on the size of parts, but is usually in the 1-3 seconds range  


Q: Are you a dealer or manufacturer?

Ans: KEEPLEADER is a professional supplier of design, building, and marketing in plastic  welding field

Q: What payment do you accept?

Ans: For first order, we accept 100% T/T before shipment, for repeated orders, we accept 50% advance, 40% before delivery, 10% after receiving

Q: Can we get sample machine?

Ans: KEEPLEADER only provide sample machine with updated design for our long-term cooperators, for first order or cooperation, KEEPLEADER can provide all of technical assistance for confirmation before ordering

Q: Can we print our own brand or logo?

Ans: Yes, KEEPLEADER accepts OEM order and customized design, configuration

Q: What certification does this machine have?

Ans: CE and RoHS

Q: Is my own forwarder available to transport the machine for me

Ans: Yes, KEEPLEADER accept nominated forwarder, or third part to arrange the shipment