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© Boardworks Ltd of 21 These icons indicate that teacher’s notes or useful web addresses are available in the Notes Page. This icon indicates that the slide contains activities created in Flash. These activities are not editable. For more detailed instructions, see the Getting Started presentation. © Boardworks Ltd of 21 Graphic Products Printing
© Boardworks Ltd of 21 Learning objectives © Boardworks Ltd of 21 the different printing methods available four colour process printing the printing effects that can be applied to printed products quality checks that are performed on printed products. To learn about:
© Boardworks Ltd of 21 Graphic products can be printed in a variety of different ways. The designer has to select the printing process that suits their product best. This will depend on the length of the print run, the quality required, the paper or card needed, and the project’s budget. The designer will choose from the following printing methods: Printing methods letterpress lithography flexography gravure screen printing.
© Boardworks Ltd of 21 Letterpress Letterpress is one of the oldest forms of industrial printing. Letterpress is known as a relief printing method, because the printing plate is not flat. A printing plate is prepared with the image to be printed raised above the surface of the plate, standing proud of the non-printing area. The raised surface is coated with ink and is then pressed onto the paper. It is an expensive process, as the plate has to be specially made and high quality paper is needed. It is used for high quality books and stationary. Printing methods
© Boardworks Ltd of 21 Lithography Lithography is the most commonly used process in the printing industry. The image is transferred onto the completely flat printing plate photographically, using UV light. The plate is washed in a chemical that makes the image area attractive to the oil-based ink. The non-image area is dampened with water to repel the ink. Lithography is used for medium to large print runs because the set-up costs are high. Printing methods
© Boardworks Ltd of 21 FlexographyFlexography is very similar to letterpress as it uses a relief plate. As the name suggests, the relief plate is made from a flexible material, like rubber. It is used to print on unconventional materials, like polythene for packaging. Flexography is ideal for these surfaces, because the ink is mixed with a solvent that evaporates, causing the ink to dry quickly. Flexography is used on carrier bags and some wallpapers. Printing methods
© Boardworks Ltd of 21 Gravure Gravure is used to produce high quality photographic images. It is very good for reproducing fine detail. However, gravure is a very costly process due to the skill needed to manufacture the printing plate. It is the opposite to letterpress – the printing areas are in fact lower then the non-printing areas. The image is engraved onto a copper plate, creating cells that are filled with a spirit based ink. The paper is pressed against these cells to produce the image. The ink evaporates quickly once printed. Printing methods
© Boardworks Ltd of 21 Screen printing Screen printing is completely different to any other printing method. It works by forcing ink through a stencil. The stencil shape reflects the image to be printed. The stencil can be made of paper or card and is supported by a fine mesh. The ink is spread over the mesh using a spreader, and then forced through the mesh onto the surface to be printed. Stencils can be made fairly simply, but to create more complex images, a photographic stencil is required. These have to be made by a professional or using a computer. Printing methods
© Boardworks Ltd of 21 Printing methods
© Boardworks Ltd of 21 Guillotines can be used to cut straight edges on batches of card and paper. Die cutting is used when the shape is irregular. A blade similar to that of a cookie cutter is made, and the design is stamped out. This can be done by hand or using a hydraulic press. Folds are created in a similar way, except that the blade does not cut all the way through – it creates a crease instead. Die cutting and folding
© Boardworks Ltd of 21 You can add interest and impact to a graphic product by adding a printing effect. There are lots of printing techniques to choose from, but they can restrict your choice of materials and add to the final cost. The designer can choose from the following printing effects: Printing effects Embossing Laminating UV Varnishing Spirit Varnishing
© Boardworks Ltd of 21 Applying varnish to a product has two main functions: Printing effects Varnishing Varnishing is done after printing but before any cutting, folding or trimming. There are several different types of varnishing. Oil-based and water-based varnishes are sometimes used, but the most important types of varnishing are spirit varnishing and ultraviolet varnishing. to protect the product to make the product look better.
© Boardworks Ltd of 21 Spirit varnishing involves applying a spirit-based coating to the product to produce a high-shine finish. It is relatively cheap, but the ink must be completely dry before the varnish is added, making the manufacturing time longer. Printing effects Ultraviolet varnishing involves applying a thin coating of liquid plastic, and then hardening it using UV radiation. It gives a tougher, glossier finish than spirit-based varnishing, but is more expensive. It cannot be added until the printing ink is completely dry. UV varnishing Spirit varnishing
© Boardworks Ltd of 21 Laminating (or encapsulating) produces a tough, high gloss finish. The image is sealed between two layers of plastic. It is twice as expensive as varnishing, but the end result is of a lot better quality. Lamination is used for products like menus that need to be easily wiped clean. Printing effects HOT LAMINATE COLD LAMINATE
© Boardworks Ltd of 21 Embossing is when a portion of the surface is raised above the surrounding area. It is used for two reasons: The required shape is pressed into the work using a steel die. Printing effects visual impact add texture Embossing can give an expensive, high quality feel.
© Boardworks Ltd of 21 Printing effects
© Boardworks Ltd of 21 To reproduce a full colour image or document, commercial printing companies use what is called ‘four colour process printing’. The four colours are called the ‘process colours’. They are overlaid to produce the full range of colours. The process colours are: Process colours The image is separated into the four process colours, and a separate printing plate is produced for each. This is known as ‘colour separation’. Cyan Black Yellow Magenta These colours are known as CMYK. Black is represented by the letter K so it is not confused with blue.
© Boardworks Ltd of 21 This image shows the colour separation for the picture in the top left hand corner. Process colours
© Boardworks Ltd of 21 Quality is essential in all products – printed products are no exception. When a document or item is printed, a series of marks are created that allow manufacturers to check that the printing has been done correctly: Registration marks These marks allow printers to check alignment. If the colour plates are aligned properly, the mark will appear black. Quality checks Colour blocks Allow you to check the colour for correct tone and equal density.
© Boardworks Ltd of 21 Plenary
© Boardworks Ltd of 21 Key points © Boardworks Ltd of 21 There are many different printing methods available, including letterpress, lithography, flexography, gravure and screen printing. Die cutters and creasing bars are used to cut out shapes and create folds accurately. You can add interest and texture to graphic products by varnishing, laminating or embossing them. Commercial printers usually use four colour process printing, which involves colour separation. Registration marks and colour blocks are used to check print quality.
Printing methods – what you need to know 1.Colour separation 2.Process colours 3.CMYK 4.Registration marks and the order of application of colours 5.Digital.
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© Boardworks Ltd of 20 Graphic Products Materials These icons indicate that teacher’s notes or useful web addresses are available in the Notes Page.
Graphic Communications Chapter 1. The term “graphic” relates to the visual, or things we see The term “communication” refers to the exchange of information.
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Printing C-cyan (bright blue colour) M-magenta (bright pink) Y- Yellow (bright Yellow) K- key colour (black) Most forms of full colour printing uses CMYK.
SURFACE FINIHSHES. LAMINATING This also produces a high gloss finish on card and provides good protection against damage as it is normally water proof.
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© Boardworks Ltd of 14 These icons indicate that teachers notes or useful web addresses are available in the Notes Page. This icon indicates that.
INFORMATION D&T: GRAPHIC PRODUCTS. We will look at some aspects of…. Typography Printing and D&T: CYNHYRCHION GRAFFIG.
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© Boardworks Ltd of 27 These icons indicate that teachers notes or useful web addresses are available in the Notes Page. This icon indicates the.
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© Boardworks Ltd of 18 These icons indicate that teacher’s notes or useful web addresses are available in the Notes Page. This icon indicates that.
Printing Process AS Graphics. Offset Lithography.
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© Boardworks Ltd of 15 These icons indicate that teacher’s notes or useful web addresses are available in the Notes Page. This icon indicates the.
© Boardworks Ltd of 9 Graphic Products Graphic Media These icons indicate that teacher’s notes or useful web addresses are available in the Notes.
© Boardworks Ltd of 17 These icons indicate that teacher’s notes or useful web addresses are available in the Notes Page. This icon indicates that.
© Boardworks Ltd of 25 These icons indicate that teacher’s notes or useful web addresses are available in the Notes Page. This icon indicates that.
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