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A forma en que o molde selecciona o refrixerador

agosto 18, 2021

Chiller is important for mold.In fact, a molde is a heat exchanger. The heat is first transferred from the molten plastic to the mold, and then from the mold to the continuously circulating cooling medium-ice water.

Only a small part of it enters the air and the pressure of the injection molding machine. modelo. Como todos sabemos, 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. Polo tanto, 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:

Por exemplo, o ciclo de moldeo dun molde é xeralmente 20 segundos. If the water in the original cooling tower is replaced with ice water produced by a chiller, pódese acurtar a 16 segundos. 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.

enfriador de aire

How to choose a chiller for the mold:

A fórmula para calcular a enerxía de auga xeada que necesita un molde é: Q=W×C×△T×S

Na fórmula: 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). Cando se combina unha única máquina, un valor pequeno é xeralmente seleccionado, e úsase un valor grande cando se combina un refrixerador con varios moldes. Por exemplo, cando se selecciona un refrixerador arrefriado por aire, S should also be selected. Choose a larger one appropriately.

Por exemplo: 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. Segundo os nosos anos anteriores de planificación e experiencia de vendas de apoio, △T=200℃, which is an average value of many commonly used products after years of statistics.

Se hai un carril de cola quente unido ao molde, the energy of the hot glue lane should also be added to the calculation of the cooling capacity. Xeralmente, the hot glue lane is in KW. The unit should be converted into kcal/h, 1KW=860kcal/h.

Se o abastecemento de auga á fábrica é suficiente, a temperatura é baixa, e o custo é baixo, 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, pero o custo adoita ser demasiado alto. This method can be used for experimental devices, but it is impractical for factories to do so.

 

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

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

The temperature of the mold cooling fluid (auga xeada) generally changes greatly due to the processing material and the shape of the product. Por exemplo, 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 enfriador 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. En moitos casos, the temperature difference is 3-5℃ is ideal, but sometimes the temperature difference is 1-2℃.

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