With the increasing social demand for plastic flexible packaging, plastic flexible packaging are in accordance with its inherent colour is gorgeous, design is novel, the characteristics of easy to use and cover the market.
Usually, divided into letterpress printing way, intaglio printing, flat printing, screen printing, etc.
Plastic printing intaglio printing, gravure press often mentioned refers to the unit type (
Or arrangement type)
Gravure printing.
1 press plastic flexible packaging printing printing speed of the unit is by various printing color printing machine set of paper feed distance between length and the effect of drying oven is good or not.
The longer distance and oven, the better, the effect of printing speed is relatively faster, whereas the printing speed will not come at the meeting.
Printer registering precision, in addition to requirements before and after the printing machine parts synchronous operation, has special requirements for the different parts of tension control system stability is good, only tension control design is reasonable, feeding smooth, stable winding, printing version will not run, to maintain the accuracy of matching color.
2 plate corrosion gravure production points (
Manual version)
And electric carving (
Electric engraving)
Two kinds, the manual version of the price is low, but the printing effect and good electric engraving, especially the level.
Found in practice, the electric engraving higher requirements for printing ink.
Plate making quality directly affect the printing effect is good or bad.
3 printing ink plastic flexible packaging gravure ink solvent ink and water-based ink.
Solvent ink is divided into table printing ink and printing ink (
Composite ink)
。
Table plastic gravure printing ink: smooth surface luster, the printing ink in the friction resistance, have a smell.
While the one-component adhesive film processing, combined with a two-component glue sex difference, the gluing quantity can't too.
Table printing ink and ordinary ink, ink resistance (
Beverage packaging ink)
Tag (ink,
Calendar ink)
And transparent ink, etc.
Ink is mainly used for milk packaging, beverage packaging and printing on the frozen
food packaging products;
Label the ink is very smooth, prevent adhesion, scratch resistant, is the best ink printing labels;
Transparent ink is special ink used for printing coated with aluminum foil and aluminum foil.
The ink (
Composite ink)
Is the feature of colour and lustre is gorgeous, printing quality, piece of peel strength is big, but not conjunctiva soft friction resistance, view the print lacklustre, film processing.
If using glue dry compound, appropriate use of two-component glue, the main purpose of increase of composite fastness, and its smell is small.
But using one-component adhesive compound, often dissolved the prints of the ink or composite good product will bring the harmful smell of glue, and poor composite reinforcement (
Pay attention to is not allowed to join alcohols solvent)
。
In addition, the common compound ink in the printing ink, printed OPP film (
The polypropylene film)
Ink printing.
Printing PET film (
Polyester film)
Should use polyester ink, the print pattern is stronger, also won't happen adhesion phenomenon.
In a word, on what film with what type of special ink, is the principle of plastic gravure ink.
Water-based ink is usually to paper products including printing and use of paper-plastic composite products.
Its characteristic is to meet the paper printing ink absorbency, makes the print color plump, more rare is the solvent is water and ethanol, the environmental pollution is small, claims to be the green ink of environmental protection.
4 composite plastic flexible packaging composite, film extrusion compound, dry coating compound and no plastic extrusion compound, etc.
Composite extrusion refers to will be PE or PP material hot-melt extrusion film, hot pressing composite in printing film formed on the composite products.
Characterized by low cost, reduce the pollution of the glue.
But to choose well good extrusion temperature, extrusion materials and control between the film and add a small amount of glue or AC agent as coupling agent, the effect will be better.
Dry coating compound machine drying tunnel length, the heating way, way of glue, glue quantity control, tension control of feeding, hot drum temperature control and cooling sizing system have constituted its price and grade of high and low.
In the process of coating composite, first, the user should understand: glue glue will be diluted, is a must to uniform is a must to restore the glue viscosity and evaporate the solvent on the coating (
The enrichment process)
And compounds on the gluing quantity is the key to the composite processing.
When the composite should pay special attention to decrease the gluing.
So is not recommended to use in food packaging.
One-component adhesive being and table printing ink blending, smell is difficult to eliminate, so suggest not to use in food packaging, composite should pay special attention to reduce the amount of glue.
If you use a two-component glue compound, in addition to the ratio of glue according to the requirements of manufacturers provide technical data, should also pay attention to the content of curing agent, to reasonably control the gluing quantity, in order to reduce the smell of the complex membrane products, rubber production.
In addition, the use of PE in the membrane as the membrane material, special attention should be paid to the surface tension of the PE film, usually should be in 45 -
More than 52 dyne, can ensure the fastness after membrane (
Suggest install edm processor) in compound film machine
。
5 plastic film by packaging requirement is different, so different packing required for plastic film is not the same.
The following is the most commonly used plastic film properties and USES of simple instructions.
PE film or polyethylene film, it has extensive USES.
Characterized by low cost, water proofing property is good, but resistance capability is poor.
Low pressure polyethylene extensibility is small, tensile strength, packaging can be made very thin, but the heat sealing performance poor, should not be used as a composite membrane.
High-pressure polyethylene film extensibility, good resistance to impact, but should not be used for Fried food and vacuum bag, retort pouch in the composite membrane.
PP membrane is also called the polypropylene film, high transparency, intensity bigger, resistance, good water resistance, but poor resistance of oxygen.
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