Different Packaging and Printing Methods Requirements for Timber and Parts (Part 2)

Polishing

Polishing

The glazing can be divided into coating glazing, calender glazing and UV (ultraviolet) glazing.

Coating is also referred to as ordinary coating. The coating is applied to a print and dried. This glazing method is simple, low cost, and the glazing effect is not as good as other glazing methods.

The glazing of the calendering is after coating the glazing, rolling with the calender, increasing the surface glossiness of the printed matter. The glazing method has a good effect, and the gloss of the printed surface is high, but the glazing speed is slow.

UV coating is coated with UV varnish on the surface of the printed product and cured by ultraviolet radiation. This glazing method has no volatilization, energy saving, bright and strong film layer, corrosion resistance, and high light speed, up to 500m/min, suitable for on-line coating, but UV coating oil is not affinity for certain materials. In addition, the price of UV coatings is relatively high.

Varnish selection principle

The glazing oil film layer has high transparency and does not change color during use; the film layer has certain toughness, elasticity and abrasion resistance; the film layer has good environmental resistance (moisture proof, sun protection); there is a certain adhesion to the surface of printed matter; good leveling property, The film surface is smooth; the post-printing processing is wide enough for subsequent processing. $Page break $

Hot stamp

Hot stamping

Gold foil hot stamping: The gold is rolled into a 10 μ sheet, coated with an adhesive, and stamped with a hot stamping plate to be hot stamped on the printed matter. This hot stamping method is of good quality and high price.

Silver foil hot stamping: The silver is stretched into 10μ sheets, coated with an adhesive, and stamped with a hot stamping plate to be printed on the printed matter. This hot stamping method is of good quality and high price.

Copper foil hot stamping: The copper powder is made into powder foil, which is heated and stamped on the printed material with a hot stamping plate. The copper foil is easily oxidized and black, which affects the hot stamping effect.

Aluminum foil hot stamping: The aluminum is rolled into a sheet, coated with an adhesive, and stamped with a hot stamping stamp on the printed matter. Aluminum foil is easily oxidized and black, which affects the effect of hot stamping.

Foil foil stamping: powdered foil made of dyestuffs, stamped with a stamping plate, heated and stamped on printed matter. This hot stamping method is simple, but the hot stamping quality is not good.

Electro-aluminum hot stamping: hot stamping onto printed matter with an electric aluminum foil. This hot stamping method is of good quality, low price, no oxidation, can be hot stamped in a variety of colors, and is widely used.

Electrochemical aluminum structure

Electrochemical aluminum foil consists of a base film layer, a barrier layer, a dyed layer, an aluminized layer, and an adhesive layer.

The base film layer is also called the film base layer and supports the other layers. After the hot stamping, the film base will take off the aluminum foil with no hot stamping part; the separation layer facilitates separating the film base layer from the hot stamping foil after the stamping, so as not to foil The film is carried away; the dyed layer provides the color for hot stamping, can have several colors, and protects the aluminized layer from being oxidized; the aluminizing layer is a method of vacuum aluminum plating to plate aluminum onto the film base layer, so that the aluminum foil is hot and hot Metal luster, aluminized layer thickness 0.025μ ~ 0.5μ, vacuum aluminum plating is heated by electricity, so that aluminum melt evaporation, it is called aluminum; adhesive layer is the aluminum layer is adhered to the substrate, and in transportation, storage In the protection of electrochemical aluminum foil.

Electro-aluminum hot stamping process parameters

1. Stamping temperature: 100°C to 130°C (plate temperature), 70°C to 180°C (machine temperature). If the temperature is too high, white or blue will appear during hot stamping, and the brightness of the metal will be reduced. If the temperature is too low, it will not be hot stamped. There will be a broken pen, and the adhesion will not be strong and it will be easily wiped off. Hot stamping area is large, the temperature is slightly higher; the other hand is lower.

2. Hot stamping time: 0.5s ~ 2s. Coordination of temperature and time, high temperature, short time; low temperature, longer time. The time is too long, the metal color is easy to dark; time is too short, hot stamping is not complete, easy to fall.

When hot stamping, the background ink must be dry. $Page break $

Die-cut indentation

Die-cutting is the cutting of paper, cardboard or other forms of blanks with a die-cutting knife as required by the design. Indentation is the use of paper, cardboard, print or other forms of blanks with the indentation line according to design requirements pressed out of the impression, easy to bend. Die-cutting indentation is the combination of die-cutting knife and indentation line in a stencil, die-cutting and indentation, called die-cutting indentation, referred to as die-pressing or die-cutting.

typesetting

1. Die-cutting and indentation tool Die cutter The commonly used height of the die cutter is 23.8mm, thickness is 0.7mm, the indentation line is selected according to the paper thickness, the height difference from the cutter is 0.3mm-0.8mm, the common height is 23mm, thickness is 0.7mm, die-cut indentation The tool is machined to the desired shape, length, and notch.

2. Indentation pattern The width of the impression groove is b = (1.5 ~ 2) δ + 0.7 (δ is paper thickness). The indentation mold includes a gypsum indentation mold, a cardboard indentation mold, a steel indentation mold, and an adhesive indentation mold. Paste indentation mold is widely used.

3. Row knife Row knife has manual row knife, mechanical row knife, laser row knife, high pressure water jet cutting row knife.

1 manual row knife: the design needs to die-cut indentation product pattern, draw the pattern on the wooden board (multi-layer plywood), make a small hole in the wood, use a hand saw blade to sew, insert the die-cut creasing tool into the saw seam, Then fix it. This type of row knife method has low accuracy, poor repeatability, and the board is easily deformed by moisture.

2 mechanical row knife: design needs to die-cut indentation product pattern, draw the pattern on the board (multi-layer plywood), make a small hole in the wood, use a special saw machine, according to the seam, the die-cutting creasing tool into the saw Sew and fix it. This kind of row knife method has high precision and certain repeatability. The wood board is easily deformed by moisture.

3 Laser Arrangement: The design needs to die-cut the indentation product pattern, input the pattern into the computer, and the computer controls the laser cutting machine to cut the board (multilayer plywood) to the required seam, insert the die-cutting and creasing tool into the seam, and then fix it. Such a row cutter method has high precision, good repeatability, quick typesetting, high equipment cost, and easy wet deformation of wood boards.

4 High Pressure Water Jet Cutting Arranging Knife: The design needs to die-cut the indentation product pattern, input the pattern into the computer, and the computer controls the high-pressure water jet cutting machine to cut the plastic plate to the required seam, insert the die-cutting and creasing tool into the seam, and then fix it. . Such a row cutter method has high accuracy, good reproducibility, quick typesetting, high equipment cost, and the use of fiber plastic plates for lining empty materials without distortion. $Page break $

Molding process

Die cutting indentation plate making process: design (pattern) → proofing → tool processing → row knife → plate → pad → sticky rubber (to prevent die cutting knife).

Die-cutting indentation process: on the plate → pressure regulator → adjust the moment → pressure die-cutting → formal die-cutting → stripping → inspection.

Molding equipment

1. Flat pressure die cutting indentation machine

Vertical flat die-cutting die-cutting creasing machine: It is divided into swing type and step type, simple in structure, easy to maintain, easy to operate, labor-intensive, low in efficiency, suitable for small batch production.

Horizontal flat die-cutting die-cutting creasing machine: die-cutting accuracy 0.1mm ~ 0.15mm, die-cutting speed 9000 / h ~ 12000 / h, most of the control system using automated and touch screen, some machines have holographic hot stamping Features. The horizontal flat-press die-cutting creasing machine is safe, reliable, highly automated, and can be used online for a wide range of applications.

2. Round pressure die-cutting machine

Round press park die-cutting creasing machine is composed of paper feeding, paper receiving, and embossing cylinder (molded plate).

Molded drums are available in assembled form (tools are mounted on the drum for ease of use and versatility) and integral type (tools are machined directly on the drum for high precision and narrow use).

Die cutting method:

1 Press-cutting method: the cutting edge touches the tool and the tool is easily damaged;

2 soft cutting method: knife under the pad engineering plastics, protection tools;

3 Shearing method: Edge-to-edge, long tool life and high manufacturing cost.

Round press die cutting and creasing machine is fast, efficient, and of good quality. It is suitable for mass production, high machine cost, and high tool cost.

3. Inline die-cutting and creasing machine

Combining the die-cutting creasing machine with the printing press and forming the linkage machine is the development direction of fully automated die-cutting and creasing.

The on-line flat die-cutting and die-cutting creasing machine adopts a horizontal type, and is often used for the die-cutting and indentation of a web. It does not need to bite a paper row and does not need to be positioned by a rule. The registration mark is used and the paper is fed by an eccentric mechanism.

On-line circular press die cutting and creasing machine runs continuously, with high efficiency, high speed and good cooperation.

Source: China Packaging News