EPS pre-foaming method
A technology of pre-foaming and foaming chamber, which is applied in the field of expandable polystyrene preparation, can solve the problems of uneven density of pre-expanded materials and uneven particle size of beads, and achieve the effects of uniform specific gravity and improved accuracy.
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Embodiment 1
[0026] Embodiment 1: Carry out EPS pre-foaming as follows:
[0027] (1) The EPS beads are continuously fed into the foaming chamber 9 of the continuous foaming and sorting device, and the steam pressure is 1.2kg / cm from bottom to top. 2 , high-temperature dry steam with a steam temperature of 102°C. Under the action of the steam, the EPS beads randomly collide and jump in the foaming chamber and perform the pre-foaming process at the same time; the stirring and mixing effect provided by the airflow effectively avoids mechanical stirring. Shearing action prevents the EPS beads from breaking during the pre-foaming stirring process.
[0028] (2) After the pre-foaming process continues for a period of time, the volume of some EPS beads increases, and the false specific gravity of foaming decreases to obtain pre-expanded products. The foamed EPS beads are located in the middle and lower part of the foaming chamber to continue pre-foaming;
[0029] (3) Pass laminar flow air into t...
Embodiment 2
[0033] Embodiment 2: all the other are identical with embodiment 1, difference is:
[0034] (1) The EPS beads are continuously fed into the foaming chamber 9 of the continuous foaming and sorting device, and the steam pressure is 0.9kg / cm from bottom to top. 2, high-temperature dry steam with a steam temperature of 95°C, under the action of the steam, the EPS beads randomly collide and jump in the foaming chamber and carry out the pre-foaming process at the same time;
[0035] (2) After the pre-foaming process continues for a period of time, the volume of some EPS beads increases, and the false specific gravity of foaming decreases to obtain pre-expanded products. The foamed EPS beads are located in the middle and lower part of the foaming chamber to continue pre-foaming;
[0036] (3) Pass laminar flow air into the top of foam chamber 9 by laminar flow fan 2, and the pre-expansion material is brought into the sorting chamber 8 of continuous foaming sorting device by laminar f...
Embodiment 3
[0038] Embodiment 3: all the other are identical with embodiment 2, difference is:
[0039] (1) The EPS beads are continuously fed into the foaming chamber 9 of the continuous foaming and sorting device, and the steam pressure is 1.05kg / cm from bottom to top. 2 , high-temperature dry steam with a steam temperature of 99°C, under the action of the steam, the EPS beads randomly collide and jump in the foaming chamber and carry out the pre-foaming process at the same time;
[0040] (2) After the pre-foaming process continues for a period of time, the volume of some EPS beads increases, and the false specific gravity of foaming decreases to obtain pre-expanded products. The foamed EPS beads are located in the middle and lower part of the foaming chamber to continue pre-foaming;
[0041] (3) Pass laminar flow air into the top of foaming chamber 9 by laminar flow fan 2, and the pre-expansion material is brought into the sorting chamber 8 of the continuous foaming sorting device by ...
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