What is a Blueprint Copier?

Blueprints, commonly known as "blueprints", are a kind of chemical coating processing paper, designed for various engineering designs and mechanical manufacturing of blueprints. They are indispensable in production, scientific research and construction. Generally, paper or cloth sensitized with ferricyanide and iron salts is used to develop photographic paper with blue and white backgrounds developed with water after exposure, especially for printing maps, mechanical drawings, and architectural drawings.

Blueprint

Right!

The blueprint is commonly known as "

Due to the different paper bases, the blueprints are divided into two categories, special numbers and number one. The special number of original paper is 90 grams or 80 grams. The blueprints are produced for the production of materials that need to be kept for a long time and for export, or for foreign aid engineering drawings. Drawing No. 1 is 80 grams for general blueprinting. Most areas in China use No. 1 drawing. There are two types of blueprint specifications: flat and roll. The width specified by the state of the roll is 88 cm. In order to meet the special needs of individual units, there are also two types of 93.63 cm width. The unit is a roll, each roll length is 50 or 100 meters. Technical paper, its standard specifications: No. 0 is 841 × 1189 mm (

From the points of use:

(1) Wet-processed blueprints, that is, water-washed blueprints, that is, iron salt drawings, whose photosensitive reduction is washed with water, and some units still use this method.

(2) Dry-processed blueprints, that is, diazo-plus-added blueprints, or ammonia-fumigated blueprints. The photoreductive reduction system uses ammonia, which is supplied by domestic manufacturers.

(3) There are two types of semi-wet photo papers. One is to apply the photosensitizer and the reducing agent to the paper, and to synthesize the photo while photosensitizing, which is not available in China; the other is for dry photo printing. Evaporate into a mist and make it map as it dries.

From the color of the line:

(1) Blue lines on white background, white lines on blue background, brown lines on white background, and wet drying drawings.

(2) Purple lines on a blue background, brown lines on a white background, black lines on a white background, and dry drawings. There are many domestic purple lines with blue background, and some areas have blue lines or black lines on white.

From the coating surface:

There are two types of single-sided coating and double-sided coating

(1) Single-side coating has two meanings: one is to apply photosensitive liquid only on the paper used; the other is to apply photosensitive agent on one side and boric acid water on one side to eliminate the warpage of the paper and improve the storage period. In fact, it is coated on both sides. Because only one side is photosensitive, it is also commonly called single-sided coated shoes. Most areas in China are in this category.

(2) Double-sided coating: both sides are coated with photosensitizer, and both sides can be printed, mainly to reduce the volume of data and save paper. At present, there are 19 places in Shanghai, Beijing, Tianjin, Hangzhou, Nanjing, Wuhan and other places producing blueprints. In recent years, the development direction is blue lines with white background and double-sided coating. In this case, the photosensitive speed is 1/5 faster than the purple line, and the color is bright, and the tolerance of the photosensitive speed is large.

Its raw materials are composed of base paper and photosensitive coating. The quality of the base paper and the appropriateness of the coating formulation directly or indirectly affect the use efficiency and shelf life of the finished product. The base paper requires sulfate or sulphite wood pulp, pulverulent grass pulp, cotton bamboo or rag cloth pulp, with appropriate amount of flammable filler, and base paper copied by a fourdrinier machine. Its paper is white and tough, no black marks and wrinkles are uniform in thickness, the tensile force is consistent, the water resistance is strong, and there is no permeability. The paper should be slightly acidic and should not contain reducing and oxidizing ingredients. Coatings are divided into diazo photosensitive coating and iron salt photosensitive coating. Diazo photosensitive coatings: Vanramine blue acid is not compatible with RT; R salt photosensitive material as an intermediate coupling agent to aid color; oxalic acid stabilizes the first two photosensitive materials; aluminum sulfate keeps vanramine blue Stable; in addition, there are auxiliary materials such as gum and acid paste blue. Iron salt photosensitive coatings: Ferric ammonium citrate is mainly used for photosensitivity; red blood salt (potassium ferricyanide) is mainly used for color development; auxiliary raw materials are gum and so on. Its production process is: base paper-coating formula-drying-inspection-packaging. The entire process must be performed in a dark room, using red electric bulbs. The coating method can be simple manual brush coating or roller mechanical coating.

Making blueprints with iron salt photosensitive paint can be easily performed, and its formula can have the following four ratios:

A solution: 1 point of ferric ammonium citrate, 4 or 5 with water;

Liquid B: 1 part of potassium ferricyanide, mix with 6 or 5.

When manufacturing, the two kinds of materials are dissolved in a certain proportion of water in a dark room, and placed in a brown glass bottle with a stopper in the dark to prevent them from being exposed. Then, a tough and smooth paper is used. Tighten (if the sheet is applied with a nail, it is easy to brush the liquid evenly on the hand). Install the roller machine; then mix the A and B liquids 1: 1 and filter to prevent damage caused by the precipitation of potassium ferricyanide; after the two liquids are mixed, they cannot be put in, and they should be immediately after filtering Apply to paper, or use a pen, cotton, etc. to drench the liquid back and forth evenly, taking care not to apply too much or too little; finally, leave it in a dark room to dry, and inspect and cut. Rolled into a cylinder in a dark room, using plastic paper, waxed paper, moisture-proof paper and 80 grams or more of kraft paper in four layers, and then wooden boxes or corrugated boxes with more than five layers, lined with moisture-proof paper, 6 or 4 rolls per box It should be stored in a ventilated, dry place with a temperature of no more than 35 degrees and a humidity of no more than 85%. It should be stored in a well-ventilated, dry place with a height of 30 cm or more. The place.

(1) Draw the drawing with ink pen or drawing pen on glass or transparent, translucent paper (photographic negatives are also possible), then place it on the blueprint, and clamp the blueprint with the blueprint using a glass or glass-framed frame Tighten without loosening. (2) Move to sunlight for 10 minutes to 1-2 hours (based on sunlight intensity and operating experience), then move into the room and take out the blueprints.

(3) Immerse the blueprint in cold water immediately and rinse it for 3-5 minutes, or rinse it in water with a little 1% dilute hydrochloric acid. The effect is better.

(4) After washing and drying, a clear blue-line blue-line blueprint appears. The principle of this process is: under the action of light, ferric ammonium citrate is reduced to ferrous ammonium citrate, and reacts with red blood salt (potassium ferricyanide) to form a water-insoluble blue ferrous ammonium ferricyanide salt Precipitates on the paper, and the unreacted part which is not exposed to sunlight is dissolved in water and washed away.

The blueprints made in this way can also be converted into images of other colors. E.g:

(1) Turn the image into a brown image. You can immerse the blueprint in dilute ammonia water and the image will gradually disappear. After washing with water, immerse it in a tannic acid solution or cold tea water, and the image will return to brown or purple brown.

(2) Convert to a purple image, that is, immerse the blue image in a borax solution or a lead acetate solution, and the image will become light purple.

(3) Convert to a green image, then immerse the blue image in a more acidic ferrous sulfate solution (40 parts of 1.5% ferrous sulfate solution is added to 1 part of 6m sulfuric acid solution to form a dipping solution) It will turn green. After removing it, wash it with water and dry it.