Cara kapang milih chiller

Chiller is important for mold.In fact, a kapang 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. citakan. Salaku urang sadayana terang, 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. Ku sabab kitu, 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:

Salaku conto, siklus molding of kapang umumna 20 detik. If the water in the original cooling tower is replaced with ice water produced by a chiller, eta bisa disingget jadi 16 detik. 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:

Rumus pikeun ngitung énergi cai és anu dibutuhkeun ku kapang nyaéta: Q=W×C×△T×S

Dina rumus: 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). Lamun mesin tunggal ieu loyog, nilai leutik umumna dipilih, sarta nilai badag dipaké nalika chiller a loyog jeung sababaraha molds. Salaku conto, lamun chiller hawa-tiis dipilih, S should also be selected. Choose a larger one appropriately.

Salaku conto: 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(kkal/jam);

6480kcal/h cooling capacity is required per hour. It is difficult to obtain relatively complete data in the process of using PR chiller. Numutkeun taun saméméhna urang tina perencanaan sarta ngarojong pangalaman jualan, △T=200℃, which is an average value of many commonly used products after years of statistics.

Lamun aya jalur lem panas napel kapang, the energy of the hot glue lane should also be added to the calculation of the cooling capacity. Umumna, the hot glue lane is in KW. The unit should be converted into kcal/h, 1KW=860kcal/h.

Upami suplai cai ka pabrik cekap, hawa nu handap, sareng biayana rendah, 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, tapi biaya sering teuing tinggi. This method can be used for experimental devices, but it is impractical for factories to do so.

Mold chillers are air-cooled, water-cooled, jsb. 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 (cai és) generally changes greatly due to the processing material and the shape of the product. Salaku conto, 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 chiller 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. Dina loba kasus, the temperature difference is 3-5℃ is ideal, but sometimes the temperature difference is 1-2℃.

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