The melters of Crack Sealing Machine are typically skid or trailer mounted and melter/applicators are equipped with a material delivery or pumping system. This system includes single or double hoses with wand attachments that are used to apply the heated sealant directly into the cracks. Hose and wand application take the place of witches hats or pour pots (See Sealant Application). Direct fire kettles also provide fast sealant melting for smaller volume projects. These models do not employ the heat-transfer oil and require specific types of sealant.
Depending on the size of the project and the capacity of the crack sealing machine kettle, feeding the melting chamber may require more than one person. Larger-volume projects may require two workers to feed one or both sides of the kettle of the Cack Sealing Machine. Well-designed melter/applicators feature one or more loading doors depending upon melter capacity and job requirements. Angled loading doors provide for easy opening, and along with a quick closing motion, prevent splashing of hot sealant. Loading heights as low as 47 inches minimize operator fatigue.
