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Specification For Pre Foaming Process Of Lost Foam

Qingdao Shengmei Machinery Co.,Ltd | Updated: Feb 09, 2018
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Specification for pre foaming process of lost foam

1.Purpose

In order to obtain a low density, smooth surface, good quality of the lost foam mold, the expandable beads must be pre foaming prior to foaming.

2.Application scope:

Apply to all of the company's original beads of pre foaming.

3.Preparation of bead before pre foaming:

3.1 Determine the type and quantity of the original beads according to the production requirements.

3.2 Prior to acceptance of raw materials, product quality assurance must be confirmed.

3.3 Storage of beads:Storage environment temperature 15.

4.The original bead prefoam process:

4.1 According to the original bead prefoam parameters (see table below) for pre foaming beads.

Original bead type

EPS

STMMA

Bead input amount (g)



Bead heating time (s)



Bead cooling time (s)



Pre foaming density (g / L)

 

22~24

19-22

4.2

The aging time parameters of prefoamed beads (see table)

Bead type

EPS

STMMA

Aging time

2~4H

48~60H

Using time

72H

48H

4.3 Required to complete the pre foamed bead quality records.

4.4 Prefoamed beads after aging treatment after passing into the next process.

5.Matters needing attention:

5.1 Foam beads for flammable items, the operation site should be put an end to fire.

5.2 Pre foaming site should be kept clean, to avoid dust, foreign matter mixed beads.



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