Drum melter with innovative sealless melting plate
In past years, SM Klebetechnik has earned an excellent reputation as a producer of customised drum melting systems, in which innovative and new process approaches are put into practice. Client benefit and machine efficiency are always in focus.
Standard drum melting concepts are based on a heated plate, which is sealed against the drum wall by a circumferential ring seal while operating.
Depending on the shape of the container, varying requirements arise. While a simple circumferential ring seal suffices for a smooth-walled steel drum, two ring seals are usually required for bead drums to achieve an overlapping seal when passing through the bead zones. This increases the thickness of the plate, which has a negative effect on the maximum possible fill level in the drum. With cardboard drums (so-called “fibre drums”) it is important to relieve the lateral pressure against the wall which arises while operating. Therefore, when using such drums in the drum melters, supporting drum jackets are used to avoid the risk of the drum wall bursting under the strain. When working with medium, high and tough viscous materials, pressure on the plate from above via the press cylinders is crucial. In the case of low viscous substances being processed, however, the new pressure-free approach can be implemented, meaning the entire ring sealing of the plate can be omitted.
Less is MORE! The SM Klebetechnik GX7561 drum melting concept for low viscous materials simplifies the melting process and reduces the potential for hazard through a sealless plate construction with almost pressure-free feed. The heated melting plate, designed as an immersion plate, is controlled at a constant immersion depth through two linked sensors (ultrasonic sensor and capacitive proximity sensor), while molten material is conveyed around the entire immersion plate by a gear pump. The resulting increased surface area enables more efficient heat transfer into the material to be melted, with corresponding optimisation of the melting capacity. The system is suitable for the processing of low viscous raw materials and materials such as EVAs, polyolefins, resins, and waxes for the production of adhesives as well as greases and pigmented materials for the production of various ink products. Drums can now also be used multiple times in an ecologically beneficial way as bulging no longer occurs. Additionally, a sealless concept does not struggle with rough internal welding seams that limit the service life of the otherwise required plate sealing rings or require a technical maintenance interval.