{"id":3377,"date":"2026-08-14T01:49:43","date_gmt":"2026-08-14T01:49:43","guid":{"rendered":"https:\/\/szfilmfactory.com\/?p=3377"},"modified":"2026-08-31T00:42:18","modified_gmt":"2026-08-31T00:42:18","slug":"bopp-anti-scratch-film-coating-technology","status":"publish","type":"post","link":"https:\/\/szfilmfactory.com\/ru\/blog\/bopp-anti-scratch-film-coating-technology\/","title":{"rendered":"BOPP Anti-Scratch Film: UV Coating Principles & Uses"},"content":{"rendered":"

BOPP anti-scratch film mainly protects the film surface by using a hard, crosslinked coating that takes most of the friction and scratching force before it reaches the BOPP substrate or printed layer.<\/strong> In high-performance products, a UV-curable coating is widely used because it can create a dense surface network in a short curing process. Depending on the required finish and performance, manufacturers may also use hybrid UV systems or modify the outer BOPP layer during co-extrusion.<\/p>\n\n\n\n

\n\n \n
\n \n \"Scratch-Resistant\n
\n

\n \u0417\u0430\u0449\u0438\u0442\u043d\u0430\u044f \u043f\u043b\u0435\u043d\u043a\u0430 \u043f\u0440\u043e\u0442\u0438\u0432 \u0446\u0430\u0440\u0430\u043f\u0438\u043d\n <\/h3>\n

\n Reliable anti-scratch protection for printed surfaces and packaging.\n <\/p>\n \n View Product \u2192\n <\/span>\n <\/div>\n <\/a>\n <\/div>\n\n \n

\n \n \"Super\n
\n

\n Super Scratch-Resistant Film\n <\/h3>\n

\n Higher surface hardness for demanding applications and longer durability.\n <\/p>\n \n View Product \u2192\n <\/span>\n <\/div>\n <\/a>\n <\/div>\n\n<\/div>\n\n\n\n

What Is BOPP Anti-Scratch Film?<\/h2>\n\n\n\n

BOPP anti-scratch film<\/a> is a biaxially oriented polypropylene film designed to improve resistance to surface scratches, scuffs, and repeated handling.<\/strong> BOPP provides good clarity, stiffness, and dimensional stability, but untreated polypropylene has relatively low surface energy and limited surface hardness. A dedicated anti-scratch layer can improve the surface performance without replacing the basic advantages of BOPP.<\/p>\n\n\n\n

The product may also be called BOPP Anti-Scratch Film<\/strong>, Scratch-Resistant BOPP Film<\/strong>, Anti-Scratch BOPP Film<\/strong>, or Scratch Resistant BOPP Film<\/strong>.<\/p>\n\n\n\n

For matte products, common terms include Scratch-Resistant Matte BOPP Film<\/strong>, Anti-Scratch Matte BOPP Film<\/strong>, and BOPP Anti-Scuff Matte Film<\/strong>. For glossy products, buyers may use Scratch-Resistant Gloss BOPP Film<\/strong> or Anti-Scratch Gloss BOPP Thermal Lamination Film<\/strong>.<\/p>\n\n\n\n

These terms usually describe the same basic performance goal: keeping the visible film surface cleaner and more resistant to mechanical damage during handling, transport, lamination, and display.<\/strong><\/p>\n\n\n\n

\"The
Anti-Scratch Gloss BOPP Thermal Lamination Film<\/a><\/figcaption><\/figure>\n\n\n\n

How Does BOPP Anti-Scratch Coating Work?<\/h2>\n\n\n\n

The basic working principle is simple: a harder surface layer absorbs and distributes mechanical stress before the force can damage the softer BOPP substrate.<\/strong> When a fingernail, package edge, paper stack, or other object moves across the film, the coating acts as the first protective barrier.<\/p>\n\n\n\n

A high-performance coating combines hardness with controlled flexibility. A coating that is only hard but too brittle may crack, while a coating with too much flexibility may not provide enough scratch resistance. The formulation therefore needs a balance between surface hardness, adhesion, flexibility, abrasion resistance, and curing shrinkage<\/strong>.<\/p>\n\n\n\n

This balance is especially important for thin films because the coating is usually only a few micrometers thick.<\/p>\n\n\n\n

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Basic Structure of BOPP Anti-Scratch Film<\/h2>\n\n\n\n

A typical coated BOPP anti-scratch film<\/a> consists of a BOPP substrate, a surface treatment layer, and an anti-scratch coating.<\/strong> The exact structure depends on whether the film is designed for dry lamination, thermal lamination, printing, or another converting process.<\/p>\n\n\n\n

A simplified structure can be shown as:<\/p>\n\n\n\n

BOPP substrate \u2192 surface treatment \u2192 anti-scratch coating<\/strong><\/p>\n\n\n\n

For a pre-coated thermal lamination film<\/strong>, an additional heat-activated adhesive layer may be used:<\/p>\n\n\n\n

BOPP substrate \u2192 anti-scratch coating \u2192 EVA<\/a> or other thermal adhesive layer<\/strong><\/p>\n\n\n\n

The BOPP substrate provides the basic mechanical and optical properties. The surface treatment improves adhesion. The anti-scratch coating provides the main surface protection. The thermal adhesive layer allows the film to bond to printed materials during the lamination process.<\/p>\n\n\n\n

The coating thickness<\/a><\/strong> is commonly in the low-micrometer range<\/strong>, with many formulations falling around 2\u20135 \u03bcm<\/strong>. Actual thickness and dry coating weight vary by formulation, equipment, and performance target.<\/p>\n\n\n\n

\n\n\n\n

Why Is Corona Treatment Important?<\/h2>\n\n\n\n

Corona treatment<\/a> improves the adhesion between low-surface-energy BOPP and the coating.<\/strong> Polypropylene is chemically non-polar and has relatively low surface energy, so many coating systems do not naturally adhere strongly to an untreated surface.<\/p>\n\n\n\n

Corona treatment changes the surface chemistry and increases surface energy. It can introduce more polar groups and improve wetting by the coating. This creates a better interface between the BOPP film and the liquid coating.<\/p>\n\n\n\n

Good corona treatment<\/a><\/strong> is not only about a higher surface-energy number. Stable and uniform treatment is important because inconsistent treatment can lead to poor wetting, weak adhesion, coating defects, or delamination.<\/strong><\/p>\n\n\n\n

For this reason, surface treatment is a key step before coating high-performance BOPP anti-scratch films.<\/p>\n\n\n\n

\"corona
corona (air plasma) surface treatment system<\/figcaption><\/figure>\n\n\n\n
\n\n\n\n

Main Technology: UV-Curable Anti-Scratch Coating<\/h2>\n\n\n\n

UV-curable coating is one of the main technologies used for high-performance BOPP anti-scratch films because it can form a hard surface network quickly.<\/strong> The coating is applied in liquid form and then exposed to ultraviolet light.<\/p>\n\n\n\n

A typical UV system may contain several functional components:<\/p>\n\n\n\n

Component<\/th>Main Function<\/th><\/tr>
Oligomer or resin<\/td>Builds the main coating structure and provides toughness<\/td><\/tr>
Reactive diluent<\/td>Reduces viscosity and participates in curing<\/td><\/tr>
Photoinitiator<\/td>Generates reactive species under UV light<\/td><\/tr>
Nano-silica or other filler<\/td>Improves hardness and abrasion resistance<\/td><\/tr>
Wetting\/leveling additives<\/td>Improve coating appearance and surface quality<\/td><\/tr>
Defoamer<\/td>Helps reduce foam and coating defects<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Aliphatic polyurethane acrylates are commonly used as important resin components when a balance of toughness, flexibility, adhesion, and wear resistance is required.<\/strong> Their functionality can be adjusted according to the desired hardness and flexibility.<\/p>\n\n\n\n

Reactive acrylate diluents can reduce coating viscosity and become part of the cured network. This allows the coating to be processed at a practical viscosity while still achieving a high crosslink density after UV exposure.<\/p>\n\n\n\n

Photoinitiators absorb UV energy and generate reactive species that start the curing reaction. The exact photoinitiator package depends on coating thickness, UV wavelength, film speed, pigment or filler content, and other process conditions.<\/p>\n\n\n\n

\n\n\n\n

How UV Curing Creates Scratch Resistance<\/h2>\n\n\n\n

UV curing increases scratch resistance by rapidly converting reactive acrylate groups into a crosslinked polymer network.<\/strong> Under UV radiation, the photoinitiator produces reactive species that initiate polymerization.<\/p>\n\n\n\n

A simplified reaction can be represented as:<\/p>\n\n\n\n

UV light \u2192 photoinitiator activation \u2192 free radicals \u2192 acrylate polymerization \u2192 crosslinked network<\/strong><\/p>\n\n\n\n

\"UV
UV curing – Wikipedia<\/a><\/figcaption><\/figure>\n\n\n\n

As the crosslinking level increases, the coating generally becomes harder and more resistant to surface deformation.<\/p>\n\n\n\n

A high crosslink density can improve resistance to:<\/p>\n\n\n\n