Carton knowledge: What is the production process of carton packaging?
Carton packaging production process.
Processing of paper containers
Paper containers are containers made of cardboard used to package goods, such as cartons, cups, etc. To evaluate the quality of grade containers, not only to evaluate the quality of printing but also to evaluate the shape of the container and the complexity of processing.
The manufacturing process of paper containers is: plate making, printing → surface processing → die cutting, creasing → box making.
Generally, it is made of cheap materials with good printing effect and is suitable for packaged goods. Yellow board paper, kraft paper, cardboard, whiteboard 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 effects, bright colors, and good glosses. However, the plate-making process is complicated and not as simple as lithographic printing. Dust spraying during the printing process prevents the backside from getting dirty.
Polyethylene coating, surface film pasting, wax coating, foil pressing, embossing and other processes can be carried out according to needs, but not all products have to undergo surface processing.
4. Diecutting, creasing(1) Die-cut plate making
The best way to make a die-cut plate is to use plywood to make a die-cut plate. First transfer the grade box pattern to the plywood, use a jigsaw to saw the seams along the tangent and folding lines, and then embed the die-cutting and crease lines into the plywood to make a die-cutting plate, which has the advantages of light weight, accurate dimensions, and preservation, etc. advantage.
It is also controlled by a computer, and the laser die-cutting version is used to input the size, shape, and weight of the carton into the computer, and then the computer controls the laser to move, engrave all the fold lines of the tangent of the carton on the plywood, and finally insert the knife Wire.
The process flow is: draw a sample box → draw an imposition plan → copy the imposition design → transfer the imposition design to the plywood → drill holes and saw seams → insert lines → make a die-cut negative template.
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.
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.
③Copy 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.
④The 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.
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.
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.
⑦Make 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.
(2) Die-cutting creasing machine
Die-cutting machine (die-cutting machine) is generally a flat pressing type, can automatically feed paper, automatic die-cutting, automatic paper delivery, and a general speed of 1800-3600 sheets/hour. Electronic control device for foreign die-cutting, the speed reaches 8500 sheets/hour, and can automatically remove waste edges.
Die-cutting and creasing machines are generally not only used for die-cutting, but also for cold-pressed concave-convex, hot-stamped flat concave-convex phone aluminum and hot-pressed concave-convex.
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Fold it into a carton shape with a box making machine for use in the next process.
Corrugated boxes are generally printed with flexographic printing, and at the same time, they are crimped, glued, or stapled with wire to form the shape of a box, which is usually folded and rotated on a plane, and then opened into a box shape when used.
