Laboratory desktop film blowing machine common problems and treatment methods
The desktop film blowing machine is mainly composed of a single screw extruder, film blowing die head, film blowing frame, blower and so on
The whole machine adopts the integrated structure, the single screw extrusion host and the film blowing unit share the same frame and set in one
frame, compact structure.
The membrane frame can be lifted and lowered electrically, which is convenient for film initiation and process control.
Its main uses are:
1) Preparation of monolayer tubular film
This set of equipment can realize conventional plastic plasticization, quantitative extrusion, tube film forming, cooling and shaping, traction
The final product is a single layer tubular film.
2) Research and development of new material formula
This set of equipment has the advantages of compact structure, high control precision, small amount of single use, and good product magnification power
It can be widely used in the research and development of various plastic blowing film forming formulas.
3) Color masterbatch dispersion performance test
The preparation of this set of equipment can also be used to study the dispersion of color masterbatch qualitative test, explore in the film blowing molding
Dispersion effect of intermediate color masterbatch in plastic matrix
4) Optimization of production process parameters and product quality control for film blowing molding
In view of the good product amplification characteristics of the equipment, the process parameters and quality control means of the equipment can be
It is very suitable for industrial production, and it is very important for the adjustment and quality control of large-scale production process
To guide the significance
In the process of using the lab desktop film blowing machine, what problems we may encounter? Here it is summarized for you. You can refer to the problem to find the corresponding solution!
1. The temperature difference is too large
It may be due to improper setting of temperature control parameters. At this time, we need to optimize PID parameters
2. The operation is unstable and the output fluctuates
The feeding section of the material barrel is not stable. The corresponding measures are as follows: manual mixing with plastic rods; Replace the hopper with vibration; Reduce feed section temperature
3. Excessive torque
Generally, the reasons for excessive torque may include: 1. The viscosity of melt is too high; 2. The temperature of barrel is too low; at this time, we need to reduce the speed of screw or increase the temperature of barrel
4. The melt pressure is too high
Too high melt viscosity or too low barrel temperature can easily lead to too high melt pressure. At this time, we can reduce the screw speed or increase the temperature of the barrel to solve this problem
5. Melt charring
High temperature or high speed will cause this problem, at this time we need to reduce the speed and reduce the temperature
6. There are air bubbles on the surface of the film
Bubbles on the surface of the film are generally moisture in the raw materials, which need to be re-dried
7. There are black, discolored stripes on the surface of the film
The nose temperature is too high or there are impurities in the nose are easy to cause this problem. We should reduce the temperature of the nose or clean the nose
8. The film color is not uniform
Generally because of improper color master selection; If the temperature is too high or the color master is decomposed, the treatment measures are as follows: 1. Choose the same color master with the base material 2. The decomposition temperature of the selected masterbatch shall not be higher than that of the film base material. 3. Reduce the extrusion and die head temperature
9. Uneven film thickness
The concentricity of the die head is not enough, and the material blockage at the mouth film is easy to cause uneven film thickness. At this time, we only need to adjust the installation position of the mouth film and clean the mouth die