Types of hot melt adhesives used in automotive hot melt adhesive dispensing:
Most automotive hot melt adhesive dispensing processes have examples of use in automobiles, but different types of hot melt adhesives will be selected for different parts and uses. According to its function, it can be divided into two categories: bonding type and sealing type. The sealing type mainly uses butyl glue. According to the use and construction temperature, it can be divided into ordinary type and heat-resistant type. Cars are mainly driven outdoors, and hot melt adhesives are generally required to have certain heat-resistant properties. If classified by material, there are EVA, rubber, APAO and PUR, PA, PES, etc., and the shapes are block, film, rod, granule and powder.
Application parts and glue types of hot melt glue dispensing processing in automobiles:
Now a car is composed of thousands of parts, and there are many parts involved in the use of automotive hot melt adhesive dispensing. Here are some of the parts that are used a lot and are common:
1. For headlights, the traditional method is to use rubber sealing strips with holes, press and seal them by screws, and use hot-melt adhesive for automotive hot-melt adhesive dispensing processing, which can be quickly bonded and sealed. , which not only reduces the cost but also facilitates automated production. The types of hot melt adhesives used in automotive hot melt adhesive dispensing processing mainly include rubber type PUR type, which requires good temperature resistance, high bonding glass strength and vibration resistance. Two-component glues are also currently available. License plate lights also use temperature-resistant hot melt adhesive for automotive dispensing to assist in fixing wiring harnesses and electronic components.
2. In the past, the dashboard, ventilation ducts, interior fixing buckles, etc. were all fixed and connected by mechanical methods, which was not only time-consuming and labor-intensive, but also had low efficiency and poor sealing performance. The production efficiency and product quality are greatly improved after using automotive hot-melt adhesive dispensing. Mainly use temperature-resistant hot-melt glue sticks, and the substrates are EVA and polyolefin types.
3. Car roof, the car roof is a composite between plastic sheets, the type of hot melt adhesive is mainly glue film and rubber powder, and the base material is PE and EVA.
4. Car door panels, car door panels need to be bonded with hot melt adhesive. There are PP parts for bonding, audio and wire harness fixing. Mainly use APAO and temperature-resistant glue sticks.
5. Car carpets and floor insulation pads, trunk buckles, etc. This is the place where automobiles use hot-melt adhesives for automotive hot-melt adhesive dispensing. The types of hot melt glue are glue blocks, glue beads and glue sticks. There are pressure-sensitive adhesives, EVA pellets, glue sticks and APAO. It is required to have a long opening time, easy to assemble and fit large pieces, good heat resistance and less odor.
6. The car wiring harness is fixed. There are a large number of wires inside the car. So many wiring harnesses cannot be fixed with wire tubes like our home decoration. Fixing with hot melt adhesive is a time-saving and efficient method, and hot melt adhesive has certain Elastic, it won’t fall off during driving bumps, and it’s easy to disassemble when it needs maintenance. Mainly use APAO hot melt adhesive for automotive hot melt adhesive dispensing processing.
