طريقة اختيار القالب للمبرد

المبرد مهم للعفن ، في الواقع, أ قالب is a heat exchanger. يتم نقل الحرارة أولاً من البلاستيك المصهور إلى القالب, ثم من القالب إلى ماء الثلج المتوسط ​​المتداول باستمرار.

فقط جزء صغير منه يدخل الهواء وضغط آلة التشكيل بالحقن. نموذج. كما نعلم جميعا, 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. وبالتالي, 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:

على سبيل المثال, دورة صب القالب بشكل عام 20 ثواني. If the water in the original cooling tower is replaced with ice water produced by a chiller, يمكن اختصاره إلى 16 ثواني. 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:

صيغة حساب طاقة الماء المثلج التي يحتاجها القالب هي:: Q=W×C×△T×S

في الصيغة: 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 (عادة 1.35-2.0). عندما تتم مطابقة جهاز واحد, يتم تحديد قيمة صغيرة بشكل عام, ويتم استخدام قيمة كبيرة عند مطابقة المبرد مع قوالب متعددة. على سبيل المثال, عند اختيار مبرد تبريد الهواء, S should also be selected. Choose a larger one appropriately.

على سبيل المثال: 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(سعر حراري / ساعة);

6480kcal/h cooling capacity is required per hour. It is difficult to obtain relatively complete data in the process of using PR chiller. وفقًا لسنواتنا السابقة من التخطيط ودعم خبرة المبيعات, △T=200℃, which is an average value of many commonly used products after years of statistics.

إذا كان هناك ممر غراء ساخن متصل بالقالب, the energy of the hot glue lane should also be added to the calculation of the cooling capacity. عموما, the hot glue lane is in KW. The unit should be converted into kcal/h, 1KW=860kcal/h.

إذا كانت إمدادات المياه للمصنع كافية, درجة الحرارة منخفضة, والتكلفة منخفضة, 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, ولكن التكلفة غالبا ما تكون مرتفعة للغاية. This method can be used for experimental devices, but it is impractical for factories to do so.

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

إلى

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

The temperature of the mold cooling fluid (الماء المثلج) generally changes greatly due to the processing material and the shape of the product. على سبيل المثال, 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 مبرد 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. في كثير من الحالات, the temperature difference is 3-5℃ is ideal, but sometimes the temperature difference is 1-2℃.

إذا كان لديك أي أسئلة حول صب الحقن,بلز لا تتردد في أن تطلب منا,سنقدم لك أفضل خدمة！

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