Resin plate making process and flow

Resin decorative plate making process

Photosensitive resin letterpress, photosensitive resin as the material, through exposure, washing and photopolymerization letterpress, combined with phototypesetting, computer typesetting technology, not only improve the speed of plate making, but also completely abandoned the lead alloy plate, so as to make the "cold typesetting" more perfect, create a new way for letterpress printing.

Photosensitive resin version according to its shape before forming resin, can be divided into liquid grinding type and solid grinding type two.

(1) liquid fixed type photosensitive resin version

The liquid cured photosensitive resin version is called the liquid resin version. Before exposure, the resin is a viscous transparent liquid, and after exposure, it is crosslinked into a solid.

1 liquid resin version composition

The main component of the liquid resin version is resin, crosslinking agent, photoinitiator, inhibitor and so on.

Resin is the main component of the photosensitive resin version, generally aliphatic, aromatic saturated, unsaturated polycarboxylic acid and diol polycondensation of unsaturated resin.

The role of crosslinking agent is to make liquid or solid resin polymerization under the action of ultraviolet light, cross linking and become solid or increase the hardness of solid. Commonly used crosslinking agents are acrylic acid, acrylyl carpal bone, ethyl dimethacrylate, glycol acrylate, etc.

Photoinitiators, also known as photosensitizers, are intermediates that transfer light energy in photopolymerization reactions. Benzoin and its ethers are often used.

Polymerase inhibitors are substances that inhibit the occurrence of dark reactions. P-phenylenediamine is usually used.

2. Liquid resin plate making - production process

Liquid resin version of the plate - the production process is generally through the spread flow, exposure, washing, drying and exposure processes.

(1) Superposition flow is made of photosensitive resin and injected into the hopper of the exposure molding machine. When the photosensitive resin flows out of the hopper, a scraper located at the top of the hopper squeezes the outgoing photosensitive resin to a certain thickness.

(2) Exposure is to cover the material flow with photosensitive resin, cover the transparent film, and then place the positive and negative film, first for positive exposure, then for the back exposure. The exposure time on the bottom side is usually 10 times that on the back side. High pressure mercury lamps with abundant ultraviolet rays are commonly used as light sources.

(3) Rinsing is to put the exposed photosensitive resin plate into the rinsing machine and use dilute sodium hydroxide solution (concentration of about 3? 5%) rinsing, generally at about 35℃ rinsing. No photopolymerization occurs, the crosslinking resin dissolves, and the film is left with text and text parts photosensitive hardening.

(4) Drying and post-exposure is to wash the sensitive resin plate and put it into the infrared dryer for drying. Photosensitive resin version after drying, after exposure, the purpose is to increase the mechanical strength of the version, improve printability.

Liquid resin version, belongs to the coating version, low price, poor dimensional stability, layout expansion is affected by temperature and humidity, suitable for the production of small lines or text printing plates, the main text of books.