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Njia ambayo mold huchagua baridi

Agosti 18, 2021

Chiller is important for mold.In fact, a ukungu 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. kiolezo. Kama sisi sote tunajua, 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. Kwa hiyo, 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:

Kwa mfano, mzunguko wa ukingo wa mold kwa ujumla 20 sekunde. If the water in the original cooling tower is replaced with ice water produced by a chiller, inaweza kufupishwa kuwa 16 sekunde. 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.

kizuia hewa

How to choose a chiller for the mold:

Njia ya kuhesabu nishati ya maji ya barafu inayohitajika na mold ni: Q=W×C×△T×S

Katika fomula: 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 (kawaida 1.35-2.0). Wakati mashine moja inalingana, thamani ndogo huchaguliwa kwa ujumla, na thamani kubwa hutumiwa wakati chiller inafanana na molds nyingi. Kwa mfano, wakati chiller kilichopozwa na hewa kinachaguliwa, S should also be selected. Choose a larger one appropriately.

Kwa mfano: 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. Kulingana na miaka yetu ya awali ya kupanga na kusaidia uzoefu wa mauzo, △T=200℃, which is an average value of many commonly used products after years of statistics.

Ikiwa kuna njia ya gundi ya moto iliyounganishwa na mold, the energy of the hot glue lane should also be added to the calculation of the cooling capacity. Kwa ujumla, the hot glue lane is in KW. The unit should be converted into kcal/h, 1KW=860kcal/h.

Ikiwa usambazaji wa maji kwenye kiwanda unatosha, joto ni la chini, na gharama ni ndogo, 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, lakini gharama mara nyingi ni kubwa sana. This method can be used for experimental devices, but it is impractical for factories to do so.

 

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

Kwa

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

The temperature of the mold cooling fluid (maji ya barafu) generally changes greatly due to the processing material and the shape of the product. Kwa mfano, 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 baridi 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. Katika hali nyingi, the temperature difference is 3-5℃ is ideal, but sometimes the temperature difference is 1-2℃.

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