GCX film is a new type of self-adhesive face material introduced by Avery Dennison in 2006 to the global label industry. Due to the special properties of the product, the material entered the market immediately and was immediately praised by the printing house and end users. Currently, GCX films have become one of the materials of choice for printing film-based self-adhesive labels among users in North America and Europe. The following text provides a brief introduction to GCX materials from the material structure, printing process characteristics and applications.
First, the basic structure
The GCX film is formed by mixing a mixture of polyethylene (PE) and polypropylene (BOPP) resin in a certain ratio and then uniaxially stretching after co-extrusion. It belongs to a polythene-based material, and the manufacturing principle is shown in Figure 1. GCX is structurally a three-layer coextrusion, with a printed layer, an intermediate layer, and a bottom layer. Since each layer has a different effect, its structural characteristics are also different, as shown in Figure 2.
Figure 1 The manufacturing process of GCX film
Figure 2 Structure of the GCX film
Printing layer
The printing surface is a matte matte effect, and the principle of this effect is that after the film is uniaxially stretched to a certain deformation, the surface forms minute, uniform pores or wrinkles. These small holes or wrinkles have a haze or matt effect visually because the reflectances are different.
Another effect of these pores or wrinkles is to increase the wettability of the film surface to the ink. No matter which kind of ink, whether it is a thin ink layer or a thick ink layer, whether it is dot printing or solid printing, the ink can be easily combined with the surface of the material, and can fully reflect the color characteristics of the graphic. If printed after the in-line corona treatment, the printing characteristics of the film surface will also be improved.
The printed layer consists of two types of components; the hard part of the crystallization provides heat resistance, die-cut impact resistance and tensile strength while the other part is a soft filling part, making the surface suitable for various printing Processing technology, whether it is UV ink or water-based ink, or hot stamping, cold stamping or thermal transfer printing, can achieve the best application results.
2. The middle layer
The middle layer is the supporting part of the material, and has a very hard resin layer for maintaining the tensile strength and hardness of the whole material, so that the machine direction does not shrink, does not deform, and remains firm when printing and labeling, during die cutting Easy to break, making print positioning, die cutting and labeling applications easier.
At the same time, the intermediate layer also has a portion of a soft resin that acts as a buffer or linker in combination with the crystallized resin. The role of the buffer is to maintain a certain degree of softness of the intermediate layer. The role of the bonding agent is to provide a good connection between the intermediate layer and the printed layer and the underlayer to make it integrated. At the same time, the soft part of the resin can also improve the anti-friction strength of the overall material and improve the die-cutting properties of the material in the vertical machine direction.
3. The bottom layer
The bottom layer has two functions; the first is a good chemical bond with the adhesive, so that the adhesive is evenly coated on the surface, does not shrink, does not blister, does not fall off during application. Another function is to match or assist the intermediate layer to maintain the hardness and tensile strength of the overall material, so that the material has good die-cutting and labeling properties after printing.
Therefore, the composition of the underlying portion of the material is also mostly composed of a crystallized, hard resin.
GCX film is a new type of self-adhesive face material introduced by Avery Dennison in 2006 to the global label industry. Due to the special properties of the product, the material entered the market immediately and was immediately praised by the printing house and end users. Currently, GCX films have become one of the materials of choice for printing film-based self-adhesive labels among users in North America and Europe. The following text provides a brief introduction to GCX materials from the material structure, printing process characteristics and applications.
First, the basic structure
The GCX film is formed by mixing a mixture of polyethylene (PE) and polypropylene (BOPP) resin in a certain ratio and then uniaxially stretching after co-extrusion. It belongs to a polythene-based material, and the manufacturing principle is shown in Figure 1. GCX is structurally a three-layer coextrusion, with a printed layer, an intermediate layer, and a bottom layer. Since each layer has a different effect, its structural characteristics are also different, as shown in Figure 2.
Figure 1 The manufacturing process of GCX film
Figure 2 Structure of the GCX film
Printing layer
The printing surface is a matte matte effect, and the principle of this effect is that after the film is uniaxially stretched to a certain deformation, the surface forms minute, uniform pores or wrinkles. These small holes or wrinkles have a haze or matt effect visually because the reflectances are different.
Another effect of these pores or wrinkles is to increase the wettability of the film surface to the ink. No matter which kind of ink, whether it is a thin ink layer or a thick ink layer, whether it is dot printing or solid printing, the ink can be easily combined with the surface of the material, and can fully reflect the color characteristics of the graphic. If printed after the in-line corona treatment, the printing characteristics of the film surface will also be improved.
The printed layer consists of two types of components; the hard part of the crystallization provides heat resistance, die-cut impact resistance and tensile strength while the other part is a soft filling part, making the surface suitable for various printing Processing technology, whether it is UV ink or water-based ink, or hot stamping, cold stamping or thermal transfer printing, can achieve the best application results.
2. The middle layer
The middle layer is the supporting part of the material, and has a very hard resin layer for maintaining the tensile strength and hardness of the whole material, so that the machine direction does not shrink, does not deform, and remains firm when printing and labeling, during die cutting Easy to break, making print positioning, die cutting and labeling applications easier.
At the same time, the intermediate layer also has a portion of a soft resin that acts as a buffer or linker in combination with the crystallized resin. The role of the buffer is to maintain a certain degree of softness of the intermediate layer. The role of the bonding agent is to provide a good connection between the intermediate layer and the printed layer and the underlayer to make it integrated. At the same time, the soft part of the resin can also improve the anti-friction strength of the overall material and improve the die-cutting properties of the material in the vertical machine direction.
3. The bottom layer
The bottom layer has two functions; the first is a good chemical bond with the adhesive, so that the adhesive is evenly coated on the surface, does not shrink, does not blister, does not fall off during application. Another function is to match or assist the intermediate layer to maintain the hardness and tensile strength of the overall material, so that the material has good die-cutting and labeling properties after printing.
Therefore, the composition of the underlying portion of the material is also mostly composed of a crystallized, hard resin.
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