Why should the heating and gluing temperature be strictly controlled when using hot melt adhesives?
Hot melt adhesives and pressure sensitive adhesives should be preheated before use. When the hot melt adhesive is heated, the temperature must be strictly controlled. The heating temperature of the hot melt adhesive has a close relationship with the fluidity and bonding strength of the adhesive. According to foreign reports, when the hot melt adhesive is heated to 170°C, the bond tension can reach (8.83±0.44)N/cm; when the temperature rises to 180°C, the bond tension drops to (7.33±0.33)N/cm. cm; when the temperature of the glue drops to 155℃, the bond will be pulled up to (5±0.25)N/cm.
It can be seen that the heating temperature of the hot melt adhesive should not be too high or too low. If the temperature is too high, although the fluidity, wettability, and permeability increase, the bonding strength will decrease. On the contrary, if the temperature is too low, although the viscosity of the glue increases, the fluidity of the glue decreases, and the pages of the book cannot be firmly bonded, resulting in degumming and loose pages, which affects the binding quality of the book. The heating temperature and gluing temperature of the hot melt adhesive must be controlled within the range of 170～180℃.
In contrast, PUR hot melt adhesives are also widely used in the mobile phone bonding industry. The heating temperature of the glue is controlled to around 130 degrees, and the temperature cannot be too high. Generally, a 30CC hot melt adhesive should be used within 4 hours, otherwise the time will be too long. The deterioration of long glue affects the bonding effect and strength. In the era of rapid development and replacement of mobile phones, mobile phone dispensing has also become a very critical era. For mobile phone assembly and dispensing technology, Dongguan Richeng Precision Instrument Co., Ltd. has developed a non-contact The high-speed hot-melt glue jet valve solves the problem of hot-melt glue dispensing on mobile phones. Its dispensing lines are rounded, dotted lines are uniform, easy to operate, and simple and easy to clean.
Hot melt adhesives and pressure sensitive adhesives should be preheated before use. When the hot melt adhesive is heated, the temperature must be strictly controlled. The heating temperature of the hot melt adhesive has a close relationship with the fluidity and bonding strength of the adhesive. According to foreign reports, when the hot melt adhesive is heated to 170°C, the bond tension can reach (8.83±0.44)N/cm; when the temperature rises to 180°C, the bond tension drops to (7.33±0.33)N/cm. cm; when the temperature of the glue drops to 155℃, the bond will be pulled up to (5±0.25)N/cm.
It can be seen that the heating temperature of the hot melt adhesive should not be too high or too low. If the temperature is too high, although the fluidity, wettability, and permeability increase, the bonding strength will decrease. On the contrary, if the temperature is too low, although the viscosity of the glue increases, the fluidity of the glue decreases, and the pages of the book cannot be firmly bonded, resulting in degumming and loose pages, which affects the binding quality of the book. The heating temperature and gluing temperature of the hot melt adhesive must be controlled within the range of 170～180℃.
In contrast, PUR hot melt adhesives are also widely used in the mobile phone bonding industry. The heating temperature of the glue is controlled to around 130 degrees, and the temperature cannot be too high. Generally, a 30CC hot melt adhesive should be used within 4 hours, otherwise the time will be too long. The deterioration of long glue affects the bonding effect and strength. In the era of rapid development and replacement of mobile phones, mobile phone dispensing has also become a very critical era. For mobile phone assembly and dispensing technology, Dongguan Richeng Precision Instrument Co., Ltd. has developed a non-contact The high-speed hot-melt glue jet valve solves the problem of hot-melt glue dispensing on mobile phones. Its dispensing lines are rounded, dotted lines are uniform, easy to operate, and simple and easy to clean.
