Indlela isikhunta esikhetha ngayo i-chiller

Chiller is important for mold.In fact, a isikhunta 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. isifanekiso. Njengoba sonke sazi, 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. Ngakho-ke, 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:

Ngokwesibonelo, umjikelezo wokubumba wesikhunta ngokuvamile 20 imizuzwana. If the water in the original cooling tower is replaced with ice water produced by a chiller, ingafushaniswa ukuze ithi 16 imizuzwana. 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:

Ifomula yokubala amandla amanzi eqhwa adingwa isikhunta ithi: Q=W×C×△T×S

Kufomula: 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). Lapho umshini owodwa ufaniswe, inani elincane ngokuvamile liyakhethwa, futhi inani elikhulu lisetshenziswa uma i-chiller ifaniswe nokubunjwa okuningi. Ngokwesibonelo, lapho kukhethwa i-chiller epholile emoyeni, S should also be selected. Choose a larger one appropriately.

Ngokwesibonelo: 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. Ngokweminyaka yethu edlule yokuhlela nokweseka umuzwa wokuthengisa, △T=200℃, which is an average value of many commonly used products after years of statistics.

Uma kukhona umzila weglue oshisayo ohlanganiswe nesikhunta, the energy of the hot glue lane should also be added to the calculation of the cooling capacity. Ngokuvamile, the hot glue lane is in KW. The unit should be converted into kcal/h, 1KW=860kcal/h.

Uma amanzi efektri enele, izinga lokushisa liphansi, futhi izindleko ziphansi, 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, kodwa izindleko zivame ukuba phezulu kakhulu. This method can be used for experimental devices, but it is impractical for factories to do so.

Mold chillers are air-cooled, water-cooled, njll. 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 (amanzi eqhwa) generally changes greatly due to the processing material and the shape of the product. Ngokwesibonelo, 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 upholile 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. Ezimweni eziningi, the temperature difference is 3-5℃ is ideal, but sometimes the temperature difference is 1-2℃.

Uma unemibuzo ku umjovo udini,plz sicela usibuze,sizokunikeza isevisi engcono kakhulu!

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