Do you know what steps are taken to make a beautiful paper box? Do you know the steps through which the beautiful packaging gift box is made? From the selection of raw materials to the completion of finished products, every step of the process is closely related to the quality of the carton. Is it ordinary printing or spot color printing? Is it matte or glossy?

1. Materials

Generally, it is made of cheap materials with good printing effect and suitable for the packaged goods. Yellow board paper, kraft paper, cardboard, white board paper, etc. are used as printing materials. If the requirements are high, copper plate lines can be mounted on these materials. Paper and printing ink should also choose light-resistant, wear-resistant, oil-resistant, chemical-resistant, and non-toxic inks according to the packaged items.

2. Plate making and printing

Use letterpress, lithography, photogravure, flexographic printing. At present, lithographic printing is the main method. Letterpress printing can produce finished products with good printing effect, bright color and good gloss. However, the plate-making process is complicated and not as simple as lithographic printing. Dust spraying during the printing process to prevent the backside from getting dirty.

3. Surface treatment

Paper box usually needs surface treatment, the common ones are glossy glue, matte glue, UV, varnish, matte oil……

4. Die-cutting indentation

The die-cutting and indentation process is a process of rolling and cutting printed matter under the action of pressure using a template formed by steel knives and steel wires. The plate making of die-cut plate is generally made of plywood. The process flow is as follows:

① Draw a carton sample

Draw the black and white manuscript knife line drawing of the carton, and there is a precise size for each box, which requires very accurate lines.

② Draw imposition design

According to the carton sample and the maximum printable paper size, the imposition design should be considered to save paper and facilitate the automatic removal of waste edges after die-cutting. Draw an imposition design drawing according to the imposition design.

③ Copy the imposition design drawing

Duplicate two imposition design drawings, one for printing and one for die-cutting, to ensure consistency and accurate registration during die-cutting.

④ The imposition design is transferred to the plywood, which can be drawn by hand or copied by photo. Hand drawn to ensure a high degree of accuracy.

⑤ Drilling and sawing

There is a special sawing machine, which is a wire saw that moves up and down. Drill holes at the junction of the two box cores, which is convenient for thread sawing and sawing along the tangent and folding lines.

The thickness of the wire saw should be adapted to the thickness of the die cutter line and crease line.

⑥ Filing

Use machines such as wire guillotines, wire benders, and punching machines to cut, bend, or bend the knife wires into various angles according to the shape of the box.

The height of the cross-cut knife line is 23.8 mm, and the thickness is 0.7 mm. The die-cut line embedded in the die-cut plate must be of the same height. The height and thickness of the crease cuts depend on the thickness of the paper. The height of the crease line is the height of the die-cutting line minus the thickness of the paper.

After the cut lines are in, foam rubber is taped to the sides so the cardboard pops out of the die-cut.

⑦ Make a die-cut negative template

In order to obtain a good seam, the negative template is to paste insulating paper on the steel plate, put it into the machine, put the carbon paper, cover with a layer of cardboard, start the machine to press it to obtain the indentation, and open the crease line on the indentation groove.

5. Box making process

The carton is folded into a carton shape by a box making machine. The forming process of the carton can be divided into a paste carton and a folding carton. Cartons are another type of cartons made by laminating the veneer material and the base cardboard. It can only be transported and stored in a fixed box. Folding cartons are usually made of thinner fold-resistant cardboard (thickness 0.3-1.1mm) after cutting and creasing, then folded and assembled, and folded in a flat form before being loaded into the product for transportation and storage.