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Shenzhen tempered glass factory, source factory for glass, the principle and process of autoclave laminated glass.

Release time:

Dec 12,2024

The principle and process of making laminated glass in a glass source factory using an autoclave can be summarized in the following steps:

1. Principle

The principle of making laminated glass lies in the high temperature and high pressure environment of the autoclave, which permanently bonds two or more pieces of glass with one or more layers of organic polymer interlayer (such as PVB film or EVA film) into one. This bonding process ensures the high safety and excellent optical performance of laminated glass.

2. Process

Raw material preparation:

Select reliable, flawless glass raw sheets, such as float glass, patterned glass, etc.

Prepare the interlayer, such as PVB film or EVA film, and choose the appropriate thickness and type according to needs.

Glass cutting and edge grinding cleaning:

Cut the glass raw sheets into suitable sizes using glass cutting equipment according to the required dimensions.

Grind the edges of the glass to remove burrs and sharp parts.

Thoroughly clean the glass with a cleaning agent to remove dust, grease, and impurities from the surface.

Lamination:

Place the cleaned glass on the workbench.

Lay a layer of interlayer (such as PVB film) on the bottom glass.

Gently cover the upper glass on the interlayer, ensuring that the positions of the two pieces of glass are accurately aligned, with no bubbles or debris in between.

Pre-pressing:

Use a pre-press machine to pre-press the laminated glass.

Remove the air between the glass and the interlayer, allowing the interlayer to initially bond with the glass.

The pressure and time of pre-pressing should be adjusted according to the size of the glass and the characteristics of the interlayer.

Autoclave treatment:

Place the pre-pressed glass into the autoclave.

Heat to a certain temperature (between 120℃ and 150℃) and maintain a certain pressure (between 1.0MPa and 1.5MPa).

Under the action of high temperature and high pressure, the interlayer will completely melt and bond tightly with the glass.

The treatment time in the autoclave is generally 1 to 3 hours, depending on the process requirements.

During the heating process, pressure needs to be maintained in the autoclave, and when the temperature reaches a specific value (such as 80 degrees), the pressure should reach a certain value (such as 1.25 MPa), until the temperature drops to a safe range (such as 40 degrees) before releasing the pressure.

The cooling stage must also be strictly controlled to ensure that the film gradually solidifies from a liquid state, forming a stable laminated structure.

Subsequent processing:

After removing the glass from the autoclave, further cleaning and drying may be required.

For some laminated glass, additional steps such as edging, sealing, venting, and curing may also be necessary.

Quality inspection:

Conduct strict quality inspections on the completed laminated glass.

Inspection items include appearance quality, dimensional accuracy, interlayer thickness, bonding strength, optical performance, etc.

Packaging and shipping:

Pack the laminated glass that has passed inspection.

Packaging materials can include wooden boxes, cardboard boxes, plastic films, etc., to protect the glass from damage during transportation and storage.

Prepare for shipment, transporting the laminated glass to the customer's designated location.

In summary, the process of making laminated glass in a glass source factory using an autoclave is a complex and meticulous process that requires strict control of the quality of each link to ensure the performance and quality of the final product.

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