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Copperplate paper self-adhesive (also known as copperplate paper self-adhesive) is a self-adhesive label material made from copperplate paper as the base material, with pressure-sensitive adhesive (adhesive) coated on the back and laminated with a release paper. Copperplate paper is a type of paper that has a white coating applied to the surface of the original paper (mainly composed of kaolin, calcium carbonate, etc.) and undergoes super calendering treatment. It has a smooth surface, high whiteness, and good ink absorption. Combined with the convenient sticking characteristics of self-adhesive, it is widely used in scenarios requiring exquisite printing, such as labels and packaging.
Core characteristics of copperplate paper self-adhesive
1. Base material characteristics: Paper base, friendly for printing
Smooth surface, high whiteness:
The coating of copperplate paper has undergone calendering treatment, and the surface smoothness is much higher than that of ordinary writing paper or kraft paper. The whiteness can reach 80% to 90%, which can best restore the saturation and brightness of printed colors, especially suitable for full-color patterns and photo-level images (such as cosmetics labels, food gift boxes).
Balanced ink absorption, clear details:
The porous structure of the coating can quickly absorb ink and is less prone to smudging and penetration, and the printed text edges are sharp, lines are smooth, suitable for labels containing small text (such as ingredient descriptions, specifications parameters).
2. Physical properties: Moderate stiffness, obvious limitations
Stiffness and toughness:
The thickness of copperplate paper is usually 80-150μm (thicker than ordinary writing paper), with good stiffness, labels are less likely to fold, and are easy to operate when manually pasted; however, it is fundamentally a paper material, with weak tear resistance, prone to damage when pulled by external force, and lacks flexibility, not suitable for adhering to curved surfaces (such as when the arc of a circular bottle is large, it is prone to curling).
Poor water resistance and moisture resistance:
The coating and original paper of copperplate paper both have hygroscopicity, and in humid environments (such as kitchens, bathrooms) or when exposed to water, they will become soft, wrinkled, or even fall off, and the surface of the label may show ink smudging; therefore, they are only suitable for use in dry environments, which is their most significant limitation.
Limited temperature resistance:
Can be used stably at normal temperature (0℃-40℃), but high temperatures (such as over 50℃) may cause paper deformation and softening of the adhesive layer; at low temperatures, although it is not prone to cracking, it is still easily damaged in a humid and low-temperature environment, and is not suitable for refrigeration or high-temperature scenarios.
3. Processing and cost: Strong process compatibility, high cost-effectiveness
Wide printing compatibility:
Compatible with mainstream processes such as offset printing, flexographic printing, and digital printing (such as inkjet, laser); offset printing can leverage its high smoothness advantage, and the printing color gradation is rich; digital printing is suitable for small-batch, personalized labels (such as custom gift stickers).
Flexible post-processing:
Can undergo treatments such as hot stamping, coating (with glossy or matte film, to some extent improving moisture resistance), embossing, and die-cutting. For example, after applying a glossy film, the surface becomes smoother and the moisture resistance slightly improves, suitable for scenarios that require a little protection (but still weaker than plastic-based materials).
Low cost, high economic efficiency:
The raw materials and processing technology of copperplate paper are mature, and the cost is much lower than plastic-based self-adhesive materials (such as BOPP, PET), suitable for low-cost label production (such as supermarket price tags, courier labels, ordinary food packaging)
Copperplate paper self-adhesive (also known as copperplate paper self-adhesive) is a self-adhesive label material made from copperplate paper as the base material, with pressure-sensitive adhesive (adhesive) coated on the back and laminated with a release paper. Copperplate paper is a type of paper that has a white coating applied to the surface of the original paper (mainly composed of kaolin, calcium carbonate, etc.) and undergoes super calendering treatment. It has a smooth surface, high whiteness, and good ink absorption. Combined with the convenient sticking characteristics of self-adhesive, it is widely used in scenarios requiring exquisite printing, such as labels and packaging.
Core characteristics of copperplate paper self-adhesive
1. Base material characteristics: Paper base, friendly for printing
Smooth surface, high whiteness:
The coating of copperplate paper has undergone calendering treatment, and the surface smoothness is much higher than that of ordinary writing paper or kraft paper. The whiteness can reach 80% to 90%, which can best restore the saturation and brightness of printed colors, especially suitable for full-color patterns and photo-level images (such as cosmetics labels, food gift boxes).
Balanced ink absorption, clear details:
The porous structure of the coating can quickly absorb ink and is less prone to smudging and penetration, and the printed text edges are sharp, lines are smooth, suitable for labels containing small text (such as ingredient descriptions, specifications parameters).
2. Physical properties: Moderate stiffness, obvious limitations
Stiffness and toughness:
The thickness of copperplate paper is usually 80-150μm (thicker than ordinary writing paper), with good stiffness, labels are less likely to fold, and are easy to operate when manually pasted; however, it is fundamentally a paper material, with weak tear resistance, prone to damage when pulled by external force, and lacks flexibility, not suitable for adhering to curved surfaces (such as when the arc of a circular bottle is large, it is prone to curling).
Poor water resistance and moisture resistance:
The coating and original paper of copperplate paper both have hygroscopicity, and in humid environments (such as kitchens, bathrooms) or when exposed to water, they will become soft, wrinkled, or even fall off, and the surface of the label may show ink smudging; therefore, they are only suitable for use in dry environments, which is their most significant limitation.
Limited temperature resistance:
Can be used stably at normal temperature (0℃-40℃), but high temperatures (such as over 50℃) may cause paper deformation and softening of the adhesive layer; at low temperatures, although it is not prone to cracking, it is still easily damaged in a humid and low-temperature environment, and is not suitable for refrigeration or high-temperature scenarios.
3. Processing and cost: Strong process compatibility, high cost-effectiveness
Wide printing compatibility:
Compatible with mainstream processes such as offset printing, flexographic printing, and digital printing (such as inkjet, laser); offset printing can leverage its high smoothness advantage, and the printing color gradation is rich; digital printing is suitable for small-batch, personalized labels (such as custom gift stickers).
Flexible post-processing:
Can undergo treatments such as hot stamping, coating (with glossy or matte film, to some extent improving moisture resistance), embossing, and die-cutting. For example, after applying a glossy film, the surface becomes smoother and the moisture resistance slightly improves, suitable for scenarios that require a little protection (but still weaker than plastic-based materials).
Low cost, high economic efficiency:
The raw materials and processing technology of copperplate paper are mature, and the cost is much lower than plastic-based self-adhesive materials (such as BOPP, PET), suitable for low-cost label production (such as supermarket price tags, courier labels, ordinary food packaging)
