Serigrafia: una tecnica di stampa dai molteplici utilizzi // Daniele Cogo

Summary

This video provides a comprehensive overview of the screen printing process, also known as serigrafia. It begins with the creation of graphic files and progresses through preparing the screen with a photosensitive emulsion. The exposed screen is washed to reveal the graphic design, followed by precise alignment for printing. Various types of inks can be used, allowing for versatility across materials like paper, textiles, and ceramics. The method's ability to apply thick layers of ink adds to its appeal, making it suitable for a wide range of applications and designs.

Takeaways

• 🖨️ Screen printing is a printing technique that uses a polyester fabric fixed to a frame called a stencil.
• 🖨️ The fabric is occluded where ink should not pass and left open where the graphic image is printed.
• 🎨 For multi-color prints, separate stencils are prepared for each color, requiring precise registration.
• 💻 The printing process starts with a graphic file that is processed into multiple files based on the colors used.
• 📄 Each color separation is printed in solid black on transparent film using high-resolution inkjet printers.
• 🔧 The screen is coated with a light-sensitive emulsion, which is then dried before exposure to the black film.
• 💡 The frame is placed in a vacuum machine to ensure the film adheres tightly to the fabric.
• ☀️ A strong white light hardens the emulsion in areas not covered by the black graphic, creating an impermeable layer.
• 💦 Unexposed emulsion is washed away with water, leaving an open mesh where ink can pass through.
• 🔥 Screen printing can use various inks, allowing it to be applied to multiple materials such as paper, plastics, textiles, and glass.

Q & A

What is serigraphy?

Serigraphy, also known as screen printing, is a printing technique that uses a polyester fabric stretched over a frame to transfer ink onto various materials.

How does the printing process begin?

The printing process begins with preparing a graphic file, which may need to be separated into multiple files based on the number of colors to be printed.

What type of films are used for color separations?

Color separations are printed on transparent photomechanical films, typically using high-resolution inkjet printers.

What materials are used for the screen frame in serigraphy?

The screen frame is generally made of wood or metal, and it holds a tensioned polyester fabric.

What is the purpose of the light-sensitive emulsion in serigraphy?

The light-sensitive emulsion is applied to the fabric and hardens when exposed to light, allowing for the creation of a stencil for the printing process.

How is the image transferred from the film to the screen?

The film with the graphic image is placed on the back of the screen, and the screen is then exposed to bright light, which hardens the emulsion in unblocked areas.

What happens to the unexposed emulsion after the exposure process?

The unexposed emulsion is washed away with water, leaving open mesh areas where ink can pass through.

What is a carousel machine used for in serigraphy?

A carousel machine is used to align multiple screens accurately for printing multiple colors in sequence.

What types of inks can be used in serigraphy?

Various types of inks can be used, including water-based, solvent-based, plastisol, and silicone inks, allowing for printing on a wide range of substrates.

What advantage does serigraphy offer regarding ink thickness?

Serigraphy allows for the application of thick layers of ink, which can be beneficial for certain printing applications.