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PCB board image transfer

PCB board image transfer

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PCB board image transfer

Structure of dry film photoresist

   Dry film photoresist is composed of three parts of the polyester film, photoresist film and polyethylene film:

   1, polyester film is supported photosensitive layer, the coating film thickness, usually about 25 M. The polyester film is removed before exposure to the development of the film, which prevents the exposure of oxygen to the resist layer, which can cause the decrease of sensitivity.

   2, polyethylene film is covered on the photosensitive glue layer of protective film, to prevent dust and other dirt fouling dry film, to avoid the film roll, each layer of resist the adhesion between the film. The average thickness of the polyethylene film is about 25 m.

   3, photoresist film is the main body of dry film, more negative photosensitive material, its thickness depending on its purpose, there are a number of specifications, the most thin can be a dozen microns, the thickness of up to 100 m.

   The production of dry film photoresist is first to be prepared in the condition of high cleanliness, the high accuracy of the coated on the polyester film, drying and cooling, and then covered with polyethylene film, wound on a roll core.

   Photo resist film composition and function: in a large amount in our country for production is full water-soluble dry film, presented here is water soluble photosensitive film layer composed of dry.

Printing etching process:

Under the material, surface cleaning, coated with the wet film, exposure, developing (paste dry film, exposing, developing), etching, to film, to enter the next process

Tian shaped electroplating process is as follows:

Metal cutting, hole drilling, hole, pre plating, surface cleaning, coated with the wet film, exposure, developing (paste dry film, exposing, developing), the formation of negative phase image, graphics plating, figure plating metal anti corrosion layer, to film, etching, to enter the next process

 

There are two methods of image transfer, one is the transfer of the screen printing image, one is the photo chemical image transfer.

   Screen printing image transfer than photochemical image transfer cost low, more so in mass production, but screen printing resist ink usually only manufacturing printed wire is greater than or equal to o.25mm, and photochemical image for transfer of light induced resist Lang manufacturing high resolution clear image.

   The content of this chapter is the latter method. Photochemical image transfer requires the use of a photoresist, and some of the basic knowledge about photoresist:

 

1) plasticizer
   Can increase the uniformity and flexibility of dry film resist. Triethylene glycol diacetate can be used as a plasticizer.
2) tackifier
   Can increase the dry film photoresist and copper surface of the chemical bonding force, to prevent the bond is not due to the adhesion of the film, such as sticking to the film, and so on. Tackifier used such as benzo triazole three.
3) thermal resistance polymer
   In the process of production and application of dry film, many steps need to be accepted by the heat. Such as methoxy phenol, hydroquinone etc. can be used as heat inhibitor.
4) pigment
   The dry film shows bright colors, easy to repair and check the version and add pigment. Such as the addition of malachite green, Sultan three of the dry pigment film showed bright green, blue etc..
5) solvent
   Solvent for the dissolution of the above groups. Acetone and ethanol as solvent is usually used. In addition some kinds of dry film also joined the photochromic agent, so that after the exposure hyperchromic or subtractive, to identify whether the exposure, this kind of dry film also called color to the film.