Die manier waarop die vorm die verkoeler kies

Verkoeler is belangrik vir vorm. Trouens, a vorm is a heat exchanger. Die hitte word eers van die gesmelte plastiek na die vorm oorgedra, en dan van die vorm na die voortdurend sirkulerende koelmedium-yswater.

Slegs 'n klein deel daarvan kom in die lug en die druk van die spuitgietmasjien. sjabloon. Soos ons almal weet, a considerable part of the plastic molding cycle is used for cooling, and sometimes it can account for more than 80% of the plastic molding cycle. Daarom, it is necessary to control the cooling time appropriately.

The mold uses a chiller to cool down faster and more efficiently than a cooling tower:

Byvoorbeeld, die gietsiklus van 'n vorm is oor die algemeen 20 sekondes. If the water in the original cooling tower is replaced with ice water produced by a chiller, dit kan verkort word tot 16 sekondes. Although the initial cost of the chiller is higher, it can increase the output by 20%, which can make a big profit in the long-term production. So how to choose the energy of ice water?

From the above we can know that it is related to the specific heat of the molding material, the temperature of the melt, the weight and the temperature of the product when it is demolded.

How to choose a chiller for the mold:

Die formule vir die berekening van die yswaterenergie wat deur 'n vorm benodig word, is: Q=W×C×△T×S

In die formule: Q is the required ice water energy kcal/h;

W is the weight of plastic raw materials kg/h;　　C is the specific heat of plastic raw materials kcal/kg℃;

△T is the temperature difference ℃ between the melt temperature and the product demolding temperature;

S is a safety factor (usually 1.35-2.0). Wanneer 'n enkele masjien ooreenstem, 'n klein waarde word gewoonlik gekies, en 'n groot waarde word gebruik wanneer 'n verkoeler met veelvuldige vorms gepas word. Byvoorbeeld, wanneer 'n lugverkoelde verkoeler gekies word, S should also be selected. Choose a larger one appropriately.

Byvoorbeeld: a mold to produce PP products, the output is about 50kg per hour, what is the cooling requirement? What size chiller should be equipped? Q=50×0.48×200×1.35=6480(kcal/h);

6480kcal/h cooling capacity is required per hour. It is difficult to obtain relatively complete data in the process of using PR chiller. Volgens ons vorige jare van beplanning en ondersteunende verkoopservaring, △T=200℃, which is an average value of many commonly used products after years of statistics.

As daar 'n warm gombaan aan die vorm geheg is, the energy of the hot glue lane should also be added to the calculation of the cooling capacity. Oor die algemeen, the hot glue lane is in KW. The unit should be converted into kcal/h, 1KW=860kcal/h.

As die watertoevoer na die fabriek voldoende is, die temperatuur is laag, en die koste is laag, then there is no need to use a chiller, which is generally not realistic, unless the factory can be located near a large lake with a lower water temperature; another It is to use urban deep well water supply to meet the temperature and flow needs, maar die koste is dikwels te hoog. This method can be used for experimental devices, but it is impractical for factories to do so.

Mold chillers are air-cooled, water-cooled, ens. If your company has a cooling tower, it is recommended to use water-cooled mold chillers, which can save costs

Aan

Setting of temperature difference between ice and water of mold chiller:

The temperature of the mold cooling fluid (Yswater) generally changes greatly due to the processing material and the shape of the product. Byvoorbeeld, in a thin-walled polyethylene beaker, the mold requires the temperature of the ice water to be below 0°C.

In most other cases, the temperature of the cold water of the chiller required by the mold must be above 5°C. The microcomputer full-featured chiller can provide ice water above 5°C, and the low-temperature intelligent temperature control Met die vinnige ontwikkeling van die can meet the requirements below 5°C. And to the requirements below 0°C.

The temperature difference of the ice water at the entrance and exit of the mold is often set according to the requirements of the product. In baie gevalle, the temperature difference is 3-5℃ is ideal, but sometimes the temperature difference is 1-2℃.

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