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EPS blocks and sheets manufacturing equipment

Clinker Panel

Insulated Concrete Forms (ICF) manufacturing equipment

Molded styrofoam

PV-2 Preexpander

is designed for the preexpansion of expandable polystyrene beads by means of thermal processing. Saturated steam is used there as heat-transfer agent.

All preexpanders can be divided into 2 types:

  • continuous type
  • batch type

The preexpander we manufacture is a BATCH TYPE preexpander.

Continuous type preexpander disadvantages:

1) It is only possible to control 2 factors while expanding:

  • steam passage through raw material (its quantity);
  • raw material residence time in the preexpander.

2) Steam pressure can only be decreased (by means of mixing it together with the air), but not increased, as the process is accompanied by air pressure (continuous type preexpanders are open and totally uninsulated vessels).
The above mentioned disadvantage apart from a possible violation of the expansion procedure triggers another and not less important one, namely inefficient steam consumption and, as the consequence, more expenses on steam generation.

3) The raw material average residence time in the continuous type preexpander is abour 3 minutes, the minimum density of expanded granules directly connected with the contents of pentane in raw material.

Batch type preexpander advantages:

1) Steam pressure can be regulated, that is why it is possible to adjust steam temperature to the required density or the level of pentane contents in raw material.

!!! Steam temperature that does not conform to the requirements may lead to the deformation of the cells.

Well-formed cell structure

 Deformed cell structure

 /images/oborudovanie_pps/yacheyki_good.jpg

 /images/oborudovanie_pps/yacheyki_bed.jpg

The lower the level of pentane in raw material, the later the expansion begins and the higher the required temperature is.
2) Batch type preexpander is an insulated vessel, that is why steam is consumed in a more efficient way and the expansion speed can be increased dramatically compared to a continuous type preexpander.

 

Specification (for the production of EPS density 25)

Parameter Name

Value

 Nominal output per cycle, m3

0,35

 System output, m3/hour, not less than

3

 Payload volume (capacity), m3

0,48

 EPS density

15, 25, 35, 50

 Bulk weight of the beads expanded, kg/m3

11...40

 Working (excess) steam pressure, MPa, not more than

0,01...0,03

 Activating engine rotational frequency, rpm

90

 Steam operative temperature, °C

100...108

 Steam consumption during preexpansion including the blockmolding process (blockmold output is maximum), kg/hour

40-60*

 Dimensions (tank diameter), mm

850x850x2100

 Weight, kg

330

 Service norm, persons

1

Electrical facilities specification

 Power lines current type

alternating three-phase current

 Current frequency rating, Hz

50

 Power circuit rated voltage, V

380

 Numer of motors in the system, pcs

1

 Drive rating, kW

1,5 kW

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Preexpander

Silo bunkers

ICF blockmold

Prebreaker/grinder

Steam boiler

Steam accumulator

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100-120 blocks/shift line

200-240 blocks/shift line

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Address: Russia, Kirov, ul. Proizvodstvennaya, 21a
Telephone: +7 (8332) 522-661, 521-121, 252-861
Fax: +7 (8332) 511-445, 51-33-22
E-mail: info@v-s-d.ru

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