In the process of using Nylon Conveyor Belt, fractures often occur. The preferred method for this situation is to perform joint bonding treatment. This can make full use of the information on nylon conveyor belts and save production costs. The following Fabric Conveyor Belt Manufacturer will give you a detailed understanding of the heat curing bonding process of nylon conveyor belts.
The characteristics of the thermal vulcanization bonding process The three elements of bonding are the basic factors of adhesive selection, joint production is an important factor, and the vulcanization process is the key factor.
1. Adhesives There are currently 3 types of adhesives used in thermal adhesive tapes.
① Sealant. The mass fraction of neoprene was 48%. It is consistent with the surface adhesive formulation of the working and non-working surfaces of the conveyor belt. Used as vulcanized material at the upper and lower joints of the belt. The thickness is 2mm and 5mm.
② Pulp film. The mass fraction of neoprene is 70%. The vulcanized material with the core layer has high plasticity and strong tensile strength. The film and gasoline are 1: 3 to 4 and are stirred well into a slurry.
③ laying. The vulcanized material with a core layer has a uniform thickness and can ensure a vulcanization strength of a thickness of 0.5 mm.
EP Nylon Conveyor Belt
2. Manufacturing of conveyor belt joints
①The principle of nylon conveyor belt joint design. As much as possible, subject the seam to shearing forces, avoid peeling forces as much as possible, and the seams and edges should be free of defects, and the bonding area should be increased as much as possible.
The type and form of the nylon conveyor belt joint. Both ends of the joint are cut into a stepped oblique angle shape, so that the dog teeth alternately overlap to improve the stress concentration and accelerate the aging caused by the stress concentration, and extend the service life. The back seam of the joint is beveled.
Step length. The step size includes the number of steps, the step size, and the number of layers of the step canvas. The length of the steps is generally 150-250mm and the number of steps is 3 ~ 5. Usually, one core layer is one step. When there are many core layers, there are one and two core steps. The upper and lower working surfaces of the belt must have a core layer. As a step, it is necessary to strictly ensure that the number of core layers corresponding to the steps at both ends of the joint is the same.
3. The process of thermal vulcanization joint of nylon conveyor belt
① The three elements of the vulcanization process are temperature, pressure and time, which are essential. The vulcanization reaction is a process in which the binder is volatilized by a solvent, the material is polycondensed, and the chemical reaction such as cross-linking and physical activity make the binder solid and have a certain strength. Only vulcanization is sufficient, and the vulcanization effect can meet the strength requirements.
② Surface treatment of belt joint. Belt joints should meet the requirements for clean, dry, fresh and effective surfaces. After the surface treatment is qualified, it should be bonded in time.
③ Gluing. The thickness is uniform and even, volatiles need to be removed to remove volatiles, and there are no air bubbles; when the head is bent, the position should be aligned once, and the air is discharged from the joint, sealed and sealed.
④ sulfide. When the pressure of 1.2-1.5 MPa and the temperature of 140 ° C are met, the internal stress can be eliminated, and the bonding strength can be improved by holding for 40 minutes. Inspection after vulcanization after peeling is strictly prohibited.
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