Some precautions must be taken when using the PUR to prevent the PUR from being cross-linked enough to cause the adhesive layer to come off easily. In order to meet the needs of PUR gluing, there are already open plastisol and closed pressure nozzle systems for PUR gluing.
The PUR binding device using roller coating requires a sealed pre-melter that is not affected by the humidity of the air. The coating device, which is easy to clean at the end of the job, must remove the PUR residue after the gluing is completed. The coating roller can be easily detached and adhered. The glue is removed.
Because the PUR hot melt will react and solidify when exposed to air, an inert gas (such as nitrogen) must be used to form a protective layer. In addition, the fumes generated by the hot melt adhesive nozzle and the upper space of the plastic tank must also be promptly discharged.
When PUR is overheated (above 140°C), isocyanate gas is released, causing an impact on the human body, such as irritating the mucous membranes of the eyes, nose, and throat, and causing headaches and other symptoms when large amounts of smoke are inhaled. According to the experiment, the usual operating temperature cannot exceed 120°C. From a safety point of view, it is advisable to set a temperature control device and a local exhaust device for the heating of the glue to promote gas diffusion. When binding a thick book, it is necessary to configure a conveyor belt that is long enough to prevent the spine from deforming and to prevent the adhesive from adhering to the cutting edge.
The PUR binding device using roller coating requires a sealed pre-melter that is not affected by the humidity of the air. The coating device, which is easy to clean at the end of the job, must remove the PUR residue after the gluing is completed. The coating roller can be easily detached and adhered. The glue is removed.
Because the PUR hot melt will react and solidify when exposed to air, an inert gas (such as nitrogen) must be used to form a protective layer. In addition, the fumes generated by the hot melt adhesive nozzle and the upper space of the plastic tank must also be promptly discharged.
When PUR is overheated (above 140°C), isocyanate gas is released, causing an impact on the human body, such as irritating the mucous membranes of the eyes, nose, and throat, and causing headaches and other symptoms when large amounts of smoke are inhaled. According to the experiment, the usual operating temperature cannot exceed 120°C. From a safety point of view, it is advisable to set a temperature control device and a local exhaust device for the heating of the glue to promote gas diffusion. When binding a thick book, it is necessary to configure a conveyor belt that is long enough to prevent the spine from deforming and to prevent the adhesive from adhering to the cutting edge.
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