How to solve the phenomenon of foaming in polyurethane foaming machine
发布时间： 2018-05-08 11:53 Author: Polyurethane foam machine Source: http: //motokone.com
Published: 2018-05-08 11:53
Strictly control the ratio of the raw material liquid and the injection amount, the ratio of the black matter, and the combination of polyether and cyclopentane. Under the condition of injecting from time to time, if the proportion of black material is too large, it will show cavitation, if the proportion of white material is too large, there will be soft foam, if the proportion of cyclopentane is too large, there will be bubbles, if the proportion is too small, it will appear cavitation. An imbalance between black and white data will cause unevenly contracted foam.
The injection volume should be based on the process request. When the injection volume is lower than the process requirement, the foam density is low and the strength is low, so that the dense hollow foam is filled. When the injection volume is higher than the process request, the foam and foam appear, and the cabinet (door body) will be deformed.
Temperature control of polyurethane foaming machine
is the key to deal with cavitation. When the temperature is too high, the response is severe and difficult to control. Foam liquid is easy to inject into larger tanks, with different properties. Chemical reactions have occurred in the foam solution. The viscosity increased rapidly and the injected foam did not respond. Liquid-injected foam cannot push the liquid into the front of the foaming process, and it appears as a phenomenon of partial cavitation in the tank.
Before and after foaming, the black and white information should be disposed with constant temperature, and the foaming temperature should be controlled in degrees Celsius. The temperature of the preheating furnace foaming equipment should be controlled in degrees Celsius, and the temperature of the foaming mold should be controlled in degrees Celsius
In between, the temperature of the foaming mold is too low, the foaming system has poor mobility, long curing time, incomplete response and cavitation. When the temperature of the foaming mold is too high, the plastic container liner is deformed by heat, and the foam system reacts violently. Therefore, the temperature of the foaming mold and the ambient temperature of the foaming furnace must be strictly controlled.
Especially in winter, in the morning line, it is necessary to foam the mold, preheat the furnace, the furnace body, and the door body, and perform preheating beyond minutes. After a period of summer foaming, the foaming system should be cooled and cooled.
Relationship between polyurethane foaming machine and temperature
Many polyurethane foaming machines are between heat and temperature because the foam is backed by heat. If not, the foaming agent will not evaporate in the system and will not produce foam. The heat comes from two aspects, one is the heat generated by chemical reactions, and the other is the heat provided by the environment. The chemical reaction heat is a fixed value and does not depend on the influence of external factors, and the heat provided by the change of the environment varies with the ambient temperature.
When the ambient temperature is high, the environment can provide heat to the reaction system, which can increase the reaction speed, shorten the sufficient response time of foam foam, and the appearance and center density of the foam. When the ambient temperature is low, the local reaction heat is dissipated into the environment. Heat loss, due to the curing period of the foam, increases the shrinkage of the foam. The experimental results show that the same foaming data, the amount of foaming at the ambient temperature of ° to a small foaming volume, on the other hand is not complete for a layer of foam or The appearance of the bubble constitutes a bubble, which increases the bubble infusion and improves the consumption cost of the bubble.
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