When manufacturing labels, the choice of adhesive backing is just as crucial as the face material and print quality. Whether a label adheres firmly, resists edge curling, or leaves behind residue upon removal often depends heavily on the adhesive applied to its backing. The adhesive commonly used on the back of labels is known as pressure-sensitive adhesive (PSA). This type of adhesive requires neither heat nor additional water; it bonds to a product's surface simply through light manual pressure. The most common types of pressure-sensitive adhesives used for labels include water-based, solvent-based (oil-based), and hot-melt adhesives. Water-Based PSAs: The Preferred Choice for Standard Labels. For the majority of printed labels, water-based acrylic pressure-sensitive adhesives are highly recommended. Using water as a dispersion medium, this type of adhesive is environmentally friendly and features low VOC (Volatile Organic Compound) emissions, making it well-suited to meet the current eco-friendly production standards of the packaging and labeling industries. It can be applied to a wide variety of materials, including paper labels, BOPP, PET, and PVC films, as well as labels for daily chemical products, food packaging, and logistics. The advantages of water-based acrylic PSAs include stable coating application, uniform adhesive layers, excellent transparency, resistance to yellowing, and superior aging resistance. For standard label applications, this adhesive strikes an optimal balance between tack strength, cost-effectiveness, and environmental friendliness, resulting in a very broad scope of application. Solvent-Based PSAs: For Labels with More Demanding Requirements Solvent-based pressure-sensitive adhesives—also referred to as oil-based adhesives—are characterized by their strong bonding strength and superior resistance to water, chemicals, and extreme temperatures (both high and low). If labels are intended for use in challenging environments—such as outdoors, on chemical drums, on automotive components, or on electronic devices—solvent-based adhesives offer distinct advantages. However, because they contain solvents, these adhesives impose stricter requirements regarding production environments, safety management, and environmental emission controls; they also tend to be relatively more expensive. Consequently, solvent-based adhesives are generally not the first choice for standard printed labels. Hot-Melt Adhesives: Commonly Used for Logistics and Carton Labels Hot-melt adhesives also play a significant role in the labeling industry, particularly for applications such as express shipping labels, carton labels, general logistics labels, and cold-chain labels. They possess strong initial tack (instant adhesion), making them ideal for bonding to rough surfaces—such as corrugated cardboard boxes—and are also well-suited for high-speed coating and production processes. However, in terms of transparency, heat resistance, aging resistance, and...

Removable adhesive labels are widely used in modern packaging, product identification and temporary labeling applications. Unlike permanent labels, removable labels can be applied firmly during use and removed cleanly when needed, helping brands improve product presentation, user experience and packaging flexibility. In many industries, removable labels are required not only to provide clear information, but also to protect the product surface after removal. Therefore, choosing the right removable adhesive is very important. What Is a Removable Adhesive Label? A removable adhesive label is a label that can be peeled off from the surface without damaging the substrate or leaving obvious adhesive residue. Depending on different application requirements, removable adhesives can be designed with low tack, medium tack or higher tack performance. Low-tack removable adhesives are suitable for applications that require easy and quick removal, while stronger removable adhesives are more suitable for rough surfaces, temperature changes or longer-term labeling needs. Common Applications of Removable Adhesive Labels 1. Promotional Labels for Consumer Products Removable labels are often used for promotional stickers on home appliances, electronics and consumer goods, such as refrigerators, washing machines and other retail products. After the promotion ends, the label can be removed easily without damaging the product surface or affecting resale. Recommended products: Removable adhesive for paper labels and synthetic paper labels. 2. Decorative Labels for Electrical Appliances Decorative and protective labels on TV screens, microwave surfaces, electric irons and glasses lenses also require removable adhesive performance. These labels can be removed when needed or kept on the product for a longer period according to consumer preference. Recommended products: Removable adhesive for paper labels and synthetic paper labels. 3. Home Furnishing and Building Materials In the home furnishing and building materials industry, removable labels are used on ceramic sanitary ware, flooring products, furniture and other surfaces. For example, labels on furniture can be removed after assembly or purchase without damaging the surface. Recommended products: Removable adhesive for synthetic paper labels. 4. Daily Chemical and Sealing Labels Removable adhesive labels are widely used for resealable packaging, such as wet wipes, sanitary products and some reusable consumer goods. These labels need good re-stick performance, allowing consumers to open and reseal the package multiple times. Recommended products: Removable adhesive for PP and PET film labels. 5. Textile and Garment Labels Decorative labels and price labels on garments and textile products often use removable adhesive materials. When removed from fabric surfaces, the label should not damage the fibers or affect the product appearance. Recommended products: Removable adhesive for PP and PET film labels. 6. Logistics an...

Printing varnish plays a multifaceted and crucial role in the post-press processing of printed materials, primarily encompassing the following points: Enhancing Visual Appeal Increased Gloss: It renders the surface of printed materials smooth and lustrous, enhancing color saturation and contrast, making images and text sharper and more striking, and thereby boosting overall visual appeal. Creating a Three-Dimensional Effect:Certain varnishes (such as UV varnish) can—through spot varnishing or specialized techniques—create raised or matte textures, adding a sense of depth and tactile quality to the printed piece. Strengthening Protective Properties Water and Moisture Resistance: It forms a transparent protective film on the surface of printed materials, acting as a barrier against water and moisture to prevent paper deformation caused by dampness and ink smudging, thereby extending the lifespan of the printed product. Abrasion and Scratch Resistance: It increases the surface hardness of printed materials, minimizing scratches and wear-and-tear during daily use, and helping to maintain a pristine appearance. Stain and Oil Resistance: It provides protection against the corrosive effects of grease, stains, and chemicals, facilitating easy cleaning and maintenance; this makes it ideal for applications such as packaging and labels that are frequently exposed to external environments. Increasing Added Value By elevating both the visual quality and durability of printed materials, it projects a more premium and sophisticated brand image, thereby boosting the product's market competitiveness and meeting consumer demand for high-quality printed goods. While different types of printing varnishes (such as water-based varnishes, UV varnishes, and matte varnishes) may vary slightly in their specific performance characteristics and application scenarios, their overarching functions consistently revolve around enhancing visual appeal, protecting the printed material, and increasing added value. With the growing demand for eco-friendly printing and high-quality packaging, water-based printing varnishes—along with related water-based resin materials—are poised to see increasingly widespread application within the printing and packaging industry

In flexographic printing, the performance of waterborne polymers and resin systems directly affects ink stability, color consistency, adhesion, and production efficiency. Traditional water-based inks may cause anilox roller clogging during long production runs, leading to unstable ink transfer and interrupted printing. In comparison, UV flexographic inks cure instantly under UV light, helping reduce dot gain, improve print sharpness, and maintain stable printing performance. Besides ink selection, ink particle size and viscosity control are also critical factors in print quality. Poor viscosity stability or uneven pigment dispersion may result in: Fuzzy dot edges Dot deformation Unstable ink transfer Poor hot stamping performance Plate dirtying and printing defects High-performance waterborne polymers and acrylic emulsions help improve: Ink adhesion Gloss and color consistency Pigment dispersion Viscosity stability Printing efficiency Coating compatibility At Sinograce Chemical, we provide customized waterborne polymers, acrylic emulsions, and resin solutions for printing inks, varnishes, coatings, and packaging applications. Our polymer solutions are designed to support stable flexographic printing performance while meeting modern environmentally friendly production requirements. Learn more about our Printing Ink Solutions Explore our Paper Ink Binder