In daily life, whether it is handicraft, home repair or industrial production, glue gun is an indispensable tool. It can quickly and effectively glue objects together, bringing great convenience to our life and work. Today, let us walk into the world of glue gun, understand its types, principles, methods of use and precautions.
1.The types of glue gun
Glue gun according to its working principle and the use of different scenarios, mainly divided into the following types:
Hot melt glue gun
        Hot melt glue gun is currently the most common type of glue gun, which uses hot melt glue stick as adhesive. The structure of hot melt glue gun mainly consists of heater, squeeze-in structure, nozzle and shell. The heater is generally a PTC heater or an electric wire, which serves to heat and melt the hot melt adhesive in the metal tube cavity. When the trigger is pulled, the squeeze-in structure pushes the subsequent hot melt adhesive into the heater, so that the melted hot melt adhesive flows out of the gun nozzle, thus realising the bonding of objects.
With the advantages of simple operation, fast bonding speed, non-toxic and environmentally friendly, the hot melt glue gun is widely used in the fields of handicrafts, home decoration, packaging industry and so on. In addition, hot melt glue guns can also be divided into battery version and wired (plug-in) version according to the power supply method. The battery version of hot melt glue gun is convenient for outdoor use, while the wired version is more efficient.
Pneumatic Glue Guns
         Pneumatic glue guns use compressed air to eject glue from the gun body to bond objects. It is usually used in applications that require a larger bonding area or higher bonding strength, such as automotive manufacturing, construction and decoration, and other industries. The advantage of pneumatic glue gun is good bonding effect, high efficiency, but need to be equipped with air compressor and other auxiliary equipment, the use of relatively high cost.
Manual glue gun
         Manual glue gun is a kind of human operation to extrude glue tools, it does not need the support of electricity or gas source, so in some special occasions (such as no power supply places) has a unique advantage. The structure of manual glue gun is relatively simple, mainly composed of gun body, piston, push rod and other components. When in use, the piston is moved in the gun body by pushing the push rod, thus extruding the glue from the gun head. Manual glue guns are suitable for small area, low intensity bonding needs, such as the bonding of small items in home maintenance.
2. Working principle of the glue gun
         Take the hot melt glue gun as an example, its working principle is relatively simple. When the power supply is turned on, the heater begins to heat the hot melt glue stick, so that it is gradually transformed from a solid state to a liquid state. When the trigger is pulled, the extruding structure pushes the hot melt adhesive stick to move towards the gun nozzle under the action of the spring, and the liquid hot melt adhesive flows out from the gun nozzle under the action of pressure to evenly coat the surface of the object to be adhered. With the lowering of the temperature, the hot melt adhesive will be rapidly cured, so that the object will be firmly bonded together.
3. The use of glue gun

• Different types of glue gun in the use of the method will be different, but the basic steps are roughly similar. Take the hot melt glue gun as an example, its use is as follows:
• Installation of glue stick: insert the hot melt glue stick into the glue gun's inlet to ensure that it is tightly combined with the heating tube in the gun.
• Turn on the power: Connect the glue gun to a suitable power source and wait for the heater to preheat the hot melt glue stick. Preheating time is usually 3-5 minutes, depending on the power of the glue gun and the diameter of the hot melt glue stick.
• Pull the trigger: After preheating is complete, pull the trigger to allow the hot melt adhesive to flow out of the gun nozzle. When gluing objects, the trigger should be pulled as hard and as long as necessary to ensure that the glue is evenly coated on the surface of the object to be glued.
• Completion of bonding: The objects coated with hot melt adhesive are tightly fitted together and kept for a certain period of time to allow the hot melt adhesive to fully cure, thus completing the bonding process.

         In short, glue gun as a convenient and efficient bonding tool, plays an important role in our life. Understanding the types, principles, usage and precautions of glue gun can help us to use it better and improve our work efficiency and quality of life.