Label material selection

A qualified sticker must be based on the properties of the surface material and the adhesive, with the appearance design, printing suitability, pasting effect as the process control, only the final application is perfect, the label is qualified.

1.The appearance of label

What is the appearance of the label you want?
No color: transparent, translucent, fully transparent, super transparent;
White: gloss white, matte white, white shading;
Metallic colors: gloss gold,matte gold, silk gold;gloss silver, matte silver, silk silver;
Laser: hologram, laser pattern.

What the label application and shape do you need?
Soft tube label: 370° full cover (overlap reserved the location of gloss oil) 350° side empty;
Sealing: sealing can only be done after being pasted and placed at room temperature above 23℃ for 24h after curing.

What is the size of label?
Stiffness: directly determine the difficulty and quality of pasting;The shape and properties of the paste objects;
Thickness: directly determines whether the label can be automatically pasted, and also affects whether the label is warped and its quality.

2.Label surface material suitable for printing
Self adhesive material in a sense is the carrier of image and information, so to solve the printing of materials is the mission of the material suppliers.The quality  problems of self adhesive film UV ink printing are mainly reflected in the ink wet and ink drop out, causing this problems the main reasons for the following aspects:

Operator’s degree of proficiency: different types of materials, different thickness of ink layer and different printing image have different requirements for UV drying unit.On the printing press, the UV curing power, printing speed and ink thickness can be adjusted, such as the operator can not handle the relationship between each other, will affect the UV drying effect, drying effect directly reflect the ink drop out.

Ink quality: UV ink suppliers are more and more on the market, the quality is not the same, and the same manufacturer of different color ink drying speed and curing degree is not the same.As the reason of the ink itself the phenomenon ink wet always happen (especially black ink).

Material: printing materials, especially thin materials, its surface tension is the main reason for affecting ink firmness, but for some materials (such as BOPP, PP, PET) rely solely on corona surface tension, is not able to meet the requirements of UV ink printing.

3.The property of paste objects
Different properties of paste objects will have a significant impact on the final pasting of the label. Different properties have different requirements on the adhesive.

If the surface energy is low, such as HDPE, LDPE, PP, etc., the glue with strong adhesive force is needed.

For example, PET bottles and PVC bags with higher surface energy are pasted,due to the polarity of the paste objects, it is necessary to prevent the adhesive remaining on the paste objects, so the adhesive with stronger cohesion should be selected.

Whether there is plasticiser or too much stripper on the surface of the paste objects, it will affect the bonding strength of the adhesive.

Rough surface of the paste objects, such as plush bottles, non-woven cloth, rough surface of PP and PE bottles, need to have a higher flexible adhesive.

4.The arc shape of the paste objects
The labeling surface of the paste objects shall be flat when it is unfolded.If both of the labeling surface are curves (spherical labeling surface) after the labeling surface is expanded, the labeling target cannot be pasted well.Therefore, the body of the bottle should be designed to avoid the use of irregular shape.

After excluding the shape of the spherical labeling surface, the larger radian is, the requirements for the softness of the material is more higher . Softness and stiffness are a pair of corresponding expression methods.