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Photovoltaic Film

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Photovoltaic Film

At the 75th session of the United Nations General Assembly, China formally proposed a "dual carbon" goal with carbon peaking in 2030 and carbon neutrality in 2060. This goal will inevitably affect all walks of life and each of us in the next 40 years.

Under the dual carbon objective, the proportion of non-fossil energy (wind energy, Solar/photovoltaic, nuclear energy, geothermal, etc.) should be increased from 17% to 80%. The installed capacity of solar  power generation is currently 3 trillion and the goal is to reach 5 billion by 2050 which is a 16-fold increase.

Investment and construction including all links of the industrial chain are at least one trillion yuan. Many companies have already seized the opportunity. For example, the core component of the solar industry inverters Huawei has become the world's number one, accounting for 30% of the market share.

Photovoltaic Film Typical Application:

Under favorable policy guidance and broad market demand, encapsulation film is a key encapsulation material for photovoltaic modules and its production enterprises are in a period of rising dividends and the number of entrants is also increasing. If they want to survive or even get out of the crowd among competitors companies must improve their production processes, quality and at the same time be able to achieve data traceability.

In the film production process, the precise ratio feeding of various raw materials is indeed the most critical part. Solar cell EVA packaging film is based on EVA (vinyl acetate content of 30-33%), supplemented with several modifiers generally including EVA resin cross-linking agent UV absorber antioxidant (or anti- heat aging agent), UV stabilizer, plasticizer  tackifier etc.

Sonner provides a standard COMPACT loss-in-weight feeding and mixing workstation for the metering of film raw materials with functional master batches, which is an ideal and mature solution for extrusion cast film processing and can well adapt to differentiation. The transition of materials is tracked to the data records of materials in real time.


Measurement plan

  • Production process

Raw material ratio mixing→ vacuum feeding→ extrusion→ screen changer→ melt pipeline→ metering pump→ mold→ cast embossing, cooling and setting→ online thickness measurement→ tempering, cooling and setting→ traction and trimming→ duplex Center winding→ finished product unloading→ side material winding→ side material treatment.


Typical Ingredients


  - Resin: Granules, bulk density 0.5-0.7Kg/L; general fluidity

  - Resin: Granules, bulk density 0.5-0.7Kg/L; general fluidity

  - Auxiliary: granules, bulk density 0.5-0.7Kg/L; good fluidity


Process Characteristics


All granular raw materials in the formula enter the loss in weight mixing station through the FC conveying system which reduces the labor intensity of workers and improves the automation level of the production line.

 The loss-in-weight mixing station adopts high-precision continuous measurement and the principle of small batch continuous mixing, which improves the accuracy of measurement with mixing and reduces the waste of premixed materials.

The traditional process of premixing additives with resins or fillers in large batches is optimized to independent small batch premixing which then enters the additive loss-in-weight feeder, this reduces the labor intensity of premixing for workers and improves the feeding proportion accuracy of additives in the formula.

 Increase in accuracy, stability and automation of the formula measurement scheme reduces environmental pollution


 Composition of common equipment


- FC small central conveying system

- Refill storage hopper

- Feed valve

- COMPACT-M Loss-in-weight mixing station

- CCO Yield Tracker

- Collection bin

-  Cast film extruder





    ·  Feeding accuracy ±0.25%, continuous small batch synchronous mixing with high mixing accuracy.

    ·  Small feeding volume can also ensure stable and reliable feeding accuracy.

    ·  CCO output tracker can maintain the constant raw material pressure required by the single-screw extruder to ensure more accurate and reliable extrusion flow control.

    ·  Access to the output signal at the metering pump of the extruder gives real-time data collection and traceability.

    ·  Tool-free quick-release design easier to clean and replace and capable of measuring multiple type  materials.

    ·  The mixing station occupies a small space, which is suitable for the narrow installation space of the cast film production line.

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Sonner Equipment Consultant

Hello! I am Miss Sun. If you need to consult the equipment model or installation and debugging problems, you can add my enterprise wechat, and we will make the measurement process scheme suitable for your enterprise!

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