Two-component foaming machine-Weihua Machinery

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Two-component foaming machine

1. Introduction: WH-PU-2-40 two-component continuous high-pressure foaming machine adopts two-component foaming system, 1 polyether (polyester) and 2 isocyanate. Each component is measured separately, and the flow rate is controlled in closed loop. Inverter, high-precision volume flowmeter and magnetic coupling are adopted, and the system can automatically change the output flow rate and mixing ratio instantaneously. The working mode of the system is continuous on-line mixing. The polyether is fed to the dynamic mixer through respective metering units for high-speed mixing. In order to improve the foaming effect and make the mixed polyether fully blend into the foaming nucleation gas, we adopt a group of gas metering devices and stir at high speed to make the mixed polyether fully nucleate and emulsify. The output mixed polyether is sprayed into mist form through the damping hole of the mixing head through the high-precision high-pressure metering unit, then it is micromixed with high-pressure mist of isocyanate. The whole machine adopts man-machine interface control, animation display work flow, various process parameters, including component flow rate, mixing ratio and mixing mode, can be set and modified in the panel, the electronic control system and the production line part are provided with signal communication interface, when the production line changes speed, the various material flow rate of the foaming machine is also changed in the same proportion, so as to ensure the quality stability of the composite board and realize the online automatic production of the whole line. 2. Technology: With the promotion and application of high flame retardant PIRB1 grade polyurethane, pentane is put into use as a foaming agent, and the new foaming machine will become the core configuration of the production line. After nearly two decades of continuous development and optimization of the foaming machine, Weihua has now fully mastered all the core technologies and has been successfully applied to many production lines at home and abroad. These technologies include: flow proportional control technology: temperature control technology: self-cleaning gun head technology: high-speed shear mixing and emulsification technology: 3. technical parameters 1) unit pouring volume: 120-500 g/s;2) the spray pressure range of the pouring head: 12-18Mpa, rated 15Mpa;3) pouring head pressure adjustment: pneumatic, on-line adjustment during production; 4) flow system control of each component: automatic closed-loop control of flow (manual operation);5) Working nature of the unit: continuous operation under high pressure; 6) working tank volume: l polyol 300L;l isocyanate 300L;7) two-component flow rate (adjustable mixing ratio):l polyol 50~300 g/s;PLOY50 ~ 300g/sl isocyanate 50~300g/s;MDI50 ~ 300g/s8) material temperature control error: 2 ℃;9) Temperature control system heating: 2 × 6Kw, cooling: 20000Kcal/h (refrigerating capacity);10) Input power is about 40Kw4. Foaming performance The foaming performance of the finished board is quite good. The following figure is a cold storage sandwich panel with a thickness of 250mm and a fire rating of B2. The enclosed area percentage is high and the thermal conductivity is low.

Key words:

Continuous sandwich panel production line, metal curtain wall composite panel

Classification:

Continuous sandwich panel production line

Product Consulting:

0510-83207527

Product inquiry

1. Introduction:

WH-PU-2-40 two-component continuous high-pressure foaming machine adopts two-component foaming system, 1 polyether (polyester) and 2 isocyanate, each component is measured separately, and the flow rate is controlled in closed loop. Using frequency converter, high-precision volume flowmeter and magnetic coupling, the system can automatically change the output flow rate and mixing ratio instantaneously. The working mode of the system is continuous on-line mixing. The polyether is fed to the dynamic mixer through respective metering units for high-speed mixing. In order to improve the foaming effect and make the mixed polyether fully blend into the foaming nucleation gas, we adopt a group of gas metering devices and stir at high speed to make the mixed polyether fully nucleate and emulsify. The output mixed polyether is sprayed into mist form through the damping hole of the mixing head through the high-precision high-pressure metering unit, then it is micromixed with high-pressure mist of isocyanate. The whole machine adopts man-machine interface control, animation display work flow, various process parameters, including component flow rate, mixing ratio and mixing mode, can be set and modified in the panel, the electronic control system and the production line part are provided with signal communication interface, when the production line changes speed, the various material flow rate of the foaming machine is also changed in the same proportion, so as to ensure the quality stability of the composite board and realize the online automatic production of the whole line.

2. Technology:

With the popularization and application of high flame retardant PIR B1 grade polyurethane, pentane is put into use as a foaming agent, and the new foaming machine will become the core configuration of the production line. After nearly two decades of continuous development and optimization of the foaming machine, Weihua has now fully mastered all the core technologies and has been successfully applied to many production lines at home and abroad. These technologies include:

3. Technical parameters

1) 1) Unit pouring quantity: 120-500 g/s;

2) Spray pressure range of pouring head: 12-18Mpa, rated 15Mpa;

3) pouring head pressure adjustment: pneumatic, production online adjustment;

4) Each component flow system control: flow automatic closed-loop control (also can be manual);

5) Working nature of the unit: high-pressure continuous operation;

6) Volume of working material tank:

Polyol 300L;

Isocyanate 300L;

7) Two-component flow (mixing ratio adjustable):

Polyol 50~300 g/s;PLOY 50~300 g/s

Isocyanate 50~300g/s;MDI 50~300g/s

8) Material temperature control error: ± 2 ℃;

9) Temperature control system heating: 2 × 6Kw, cooling: 20000Kcal/h (refrigerating capacity);

10) Input power is about 40Kw

4. foaming performance

The foaming performance of the finished board is quite good. The following figure is a cold storage sandwich panel with a thickness of 250mm and a fire rating of B2. The enclosed area percentage is high and the thermal conductivity is low.

pentane system

Under the Montreal Protocol on Substances that Deplete the Ozone Layer, published in 1989, the use of chlorofluorocarbons has been discontinued in Europe and the Americas. Since 1993, cyclopentane has been considered in Europe as an alternative to chlorofluorocarbons. Currently, China, India, the United Arab Emirates and other developing countries are phasing out CFCs/HCFCs. For the foaming system with pentane as foaming agent, the following factors need to be considered:

1. Pentane storage system

The pentane storage and conveying system is mainly used to store cyclopentane unloaded from the tanker and automatically feed the foaming machine. Because pentane vapor is flammable and explosive, the system must be strictly in accordance with the relevant standards.

The pentane storage system includes: tank body, pentane delivery system, tank body breathing system, liquid level system, unloading system and pentane detection system.

2. Pentane foaming system

All pentane related parts and pipes on the foaming machine are installed in a small room with probes and dual exhaust systems to ensure safety. The detection head is installed on the storage tank.

The safety system is controlled by an independent electrical cabinet, independent of the operating cabinet.

3. Pentane safety system

Pentane detection devices will be installed in pentane leakage areas and possible leakage areas, including crawler and cloth areas and storage tanks. Help customers run production lines safely and reliably.

Main Achievements

WEIHUA is the only Chinese company that has won the bid for the United Nations pentane continuous foaming machine project (refer to the winning documents). We have mastered pentane storage, transportation, mixing, safety and other technologies, and put into actual production in 2014. We not only provide equipment, but also provide customers with a series of services such as establishing employee training mechanism, operating procedures, post leakage early warning mechanism, etc., to achieve 100 percent safety from machine to personnel.

WEIHUA's latest product: four-component foaming machine for polyurethane sandwich panel production line, delivered to Duowei Group, a leading domestic sandwich panel manufacturer. The flow accuracy of MDI is 1 ‰, the mixture is 1 ‰, the catalyst is 1 ‰, and the foaming agent is 5 ‰.

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