First, the process basis

  1.1 Material characteristics and process requirements

Main materials and ratio

1) main material - POE / EVA resin particles, microelastic, material melting point: 60-70 ° C, diameter of about 5 mm, pellet bulk density of 0.55-0.6, weight ratio of about 96%;

2) Auxiliary 1 - 5 kinds of liquid, need to be kept warm, can be mixed in 2 kinds, one of which is frozen at low temperature, one can not be exposed to air for a long time, and the other 3 kinds have no special requirements;

The liquid has a slight viscosity and a weight ratio of about 3%;

3) Auxiliary 2 - 3 kinds of powder, the weight ratio is about 1%;

4) mixing time 6-8h, standing time 24h;

5) The extruder is operated at 24h without stopping, and the extrusion amount is 500kg/h;

6) Space on the second floor, height Max=4900mm, Min=4300mm, load-bearing column 8000mm*7600mm, maximum load capacity 500kg/m2, space on the first floor, height Max=5200mm, Min=4500mm, load-bearing column 8000mm*7600mm;

Mixing requirements

1) A conical mixer with a volume of 10 m3. The mixer is mixed at low speed and can be adjusted;

2) The material contact surface of the mixer is made of stainless steel and needs to be polished to the mirror surface;

3) The mixing machine cylinder needs to be controlled by water circulation/oil circulation, and the temperature control is in the range of 40-50 °C, which can be adjusted and monitored;

4) The cover is easy to open, and the inside of the mixer is easy to clean;

5) The shaft end seal does not leak material and does not produce black spots for easy maintenance;

6) The liquid auxiliary agent is added in a linear intermittent manner, and the addition time can be controlled from 10 min to 30 min/time;

7) There is a return circulation at the bottom of the mixing tank to prevent uneven mixing at the bottom.

Production Process

This production process is divided into two modes, one automatic line and one semi-automatic line. The process requirements are as follows:

Automatic line (total one)

Mainly: the pellets (EVA or POE) tons are placed near the mixer on the second floor. The suction nozzle is manually inserted into the tonnage bag and sucked into the vacuum scale by vacuum suction. The vacuum outlet is required to be equipped with iron remover. Vacuum scale After metering, put it into the mixer.

Powder additives: a total of three types, manually put three powder in loss-in-weight, loss-in-weight according to the proportion of the formula, feeding time continuous feeding or intermittent feeding to the mixer.

Liquid auxiliaries: a total of 5 kinds, manually put 5 liquid in loss-in-weight, loss-in-weight according to the formula ratio, feeding time continuous feeding or intermittent feeding to the mixer, spray method: linear spray.

A bottom material returning device is required.

The mixed materials are discharged into the transfer bin and manually dragged to the material point.

Semi-automatic line (total of five)

1) Mainly: the pellets (EVA or POE) are placed in the vicinity of the mixer on the second floor. The suction nozzle is manually inserted into the tonnage bag and sucked into the vacuum scale by vacuum suction. The vacuum outlet is required to be equipped with iron remover. The vacuum scale is metered and put into the mixer.

2) Powder additives: a total of two kinds, manual metering separately into two powder volume feeders, volumetric feeders according to the feeding time continuous feeding or intermittent feeding to the mixer.

3) Liquid auxiliaries: a total of 1 kinds, manually mixed and metered, and then put into a liquid volumetric feeder, liquid volume feeder according to the formula ratio, feeding time continuous feeding or intermittent feeding to the mixer, spray method For: linear spray.

4) A bottom material returning device is required.

5) The mixed materials are discharged into the transfer bin and manually dragged to the material point.