New Process Of Hot Stamping-Specific Lamination Film Matched With Offset Printing Ink After Hot Stamping Solves The Problem Of Edge Lifting And Void Formation in Lamination Of High-End Packaging

Hot stamping, offset printing and lamination composite processes are mainstream production technologies for high-end packaging of tobacco, alcohol, cosmetics and gifts, and also key procedures to improve the appearance texture and added value of products. However, in actual production, common industry pain points persist, including lamination film edge lifting at hot-stamped areas, corner voids, weak interlayer adhesion and tiny bubbles. These defects easily lead to mass rework and scrapping, driving up production costs and delaying order delivery. To address this long-standing intractable process challenge, the industry has launched a complete new process combining special offset printing ink for post-hot-stamping use and hot-stamping-adaptable lamination film. Through optimized ink formulas, upgraded adhesive layers of lamination films and standardized parameter adaptation for all working procedures, this technology fundamentally eliminates typical defects in hot stamping lamination, greatly boosting finished product yield and stability. At present, the process has achieved stable mass production in multiple printing enterprises.

As packaging printing advances toward high-end and exquisite production, the market imposes increasingly stringent requirements on the flatness, fineness and durability of products combining hot stamping, offset printing and lamination. Meanwhile, the adaptability shortcomings of conventional universal production processes have become prominent, emerging as major bottlenecks restricting quality and efficiency improvements for high-end orders.

The surface of the electrothermal hot stamping foil is dense, smooth and low in surface energy, resulting in poor wettability. Conventional offset printing ink struggles to spread evenly on the foil surface and suffers weak adhesion. In addition, the hot melt adhesive of standard lamination films cannot effectively bond with the low-surface-energy hot stamping layer, creating inherent obstacles to lamination adhesion. Furthermore, conventional general offset printing ink forms brittle cured films with insufficient flexibility and ductility. During high-temperature hot pressing for lamination, stress concentrates at the overlapping edges of hot stamping layers and ink films, triggering micro-cracks, edge lifting and delamination.

Most latent defects such as tiny voids, hairline gaps and microbubbles are hard to detect during factory quality inspection. These flaws deteriorate after die-cutting, embossing, box folding, storage and transportation, resulting in mass returns and economic losses. Additionally, traditional production lacks a standardized parameter system; ink proportioning, drying duration, lamination temperature and pressure are all regulated based on workers' personal experience. This leads to inconsistent batch quality and high rework rates, which not only raise production costs but also severely limit printing enterprises' capacity to undertake high-end orders.

The newly adopted process completely abandons the extensive model of "universal consumables for universal processes". Targeting the special working conditions of offset printing and lamination after hot stamping, it carries out systematic upgrades from three dimensions: special ink formulas, hot-stamping-specific lamination film structures and full-process technical parameters, forming a replicable, mass-producible and highly stable standardized solution.
1. Optimization of Printing Ink

The independently developed offset printing ink dedicated to post-hot-stamping use features a reconstructed resin system that significantly enhances the flexibility and ductility of ink films, eliminating the cracking defect caused by the brittleness of cured conventional ink under compression. Its optimized wetting and dispersion system greatly improves the spreading performance and adhesion of ink on low-surface-energy hot stamping layers, forming a stable composite structure of "paper substrate – hot stamping layer – ink layer – lamination film layer" to prevent interlayer separation, peeling and delamination. The curing speed of the ink is precisely calibrated to match the rhythm of high-speed production lines, effectively avoiding two common issues: sticking and bubbling caused by insufficient ink curing, and reduced adhesion resulting from excessive curing and aging.
2. Upgrade of Lamination Film

The matching hot-stamping-specific lamination film features an upgraded hot melt adhesive layer formula. Adopting a low-temperature high-activity hot melt adhesive system, the adhesive fully melts and infiltrates under mild hot pressing conditions, accommodating the characteristics of hot stamping layers that are vulnerable to high-temperature discoloration, gloss loss and deformation. The adhesive layer boasts greatly improved fluidity and filling capacity, which can fully fill texture gaps of hot stamping layers and tiny irregularities on ink films, completely eradicating classic defects including voids, blank areas and bubbles at hot-stamped positions. Meanwhile, the adhesive layer is optimized for tensile resistance, friction resistance and weather resistance, ensuring consistent product appearance through subsequent deep processing procedures such as die-cutting, embossing and box folding.
3. Process Control Standardization

The new process establishes a complete standardized parameter system to reduce reliance on workers' experience. It uniformly regulates core parameters including hot stamping setting temperature, offset printing overprinting interval, ink drying matching degree, lamination temperature and pressure, and paper feeding speed. This breaks barriers between connected working procedures, resolves various quality problems stemming from mismatched procedures and parameters, and realizes standardized mass production with consistent product quality across batches.

Verified by field applications on high-speed production lines of multiple packaging printing enterprises, this complete new process delivers strong compatibility and stable implementation effects, fundamentally addressing the drawbacks of conventional processes and bringing remarkable comprehensive production benefits.
1.Quality Improvement

The new process completely eliminates defects including edge lifting at hot-stamped positions, corner voids, interlayer bubbles, hairline delamination and peeling after die-cutting. Laminated surfaces are flat, uniform, smooth and clean, fully retaining the metallic texture of hot stamping and color saturation of offset printing ink without adverse phenomena such as embossing, whitening or gloss loss. It fully meets the strict quality control standards of high-end brands and significantly elevates product appearance grade.
2.Enhanced Production Stability

The new process features strong anti-interference performance, barely affected by fluctuations in workshop temperature and humidity or differences in paper substrates. It stably adapts to mainstream high-end printing substrates including coated paper, special art paper and heavy-weight cardboard, ensuring high consistency in mass production and resolving the uneven batch quality plaguing conventional processes.
3.Cost Reduction and Efficiency Boost

The new process cuts the defect rate of high-end hot-stamped laminated products by over 80%, drastically reducing hidden costs such as scrapping losses, labor expenses for rework and order compensation. Standardized parameter operation lowers machine setup thresholds and reduces dependence on senior technicians, steadily improving equipment utilization rate and production capacity, enabling enterprises to achieve refined cost reduction and high-quality efficiency gains.
4.Easy Implementation and Wide Compatibility

The new process boasts high compatibility without the need to revamp existing core offset printing and lamination equipment. It can be rapidly deployed merely by replacing special offset printing ink and dedicated lamination film and adjusting standard process parameters, featuring low implementation costs and strong promotion potential for small, medium and large packaging printing enterprises alike.

Designed primarily for high-end premium packaging, this new process is widely applicable to high value-added products including tobacco and alcohol gift boxes, cosmetic color boxes, premium food and gift packages, cultural and creative premium goods, and luxury outer packaging. It precisely satisfies the strict high-end market requirements for printing appearance, finished product yield and batch stability, helping printing enterprises break through technical barriers for high-end orders and strengthen market competitiveness.

From the perspective of industrial development, the integrated upgrade of matched ink and lamination film fills the long-standing technical gaps in composite printing combining hot stamping and overprint lamination, and covers the blank of standardized processes for high-end composite printing. Replacing the traditional extensive experience-based production model with a systematic solution of "specialized consumables + standardized processes", the new process provides a mature and implementable premium production scheme for the industry, effectively driving the transformation of the packaging printing sector from large-scale processing to refined, high-quality intelligent manufacturing.

Competition in the current printing industry has shifted from output and price competition to rivalry over process quality, refined production and product added value. Stable, delicate and high-gloss composite printing technologies have become core competitiveness for printing enterprises. As a core process for high-end packaging, upgrading the integrated hot stamping, offset printing and lamination technology carries great significance for the industry's quality-oriented development.

This complete new process accurately tackles long-standing quality challenges in hot stamping lamination, realizing triple optimization of product quality, production stability and production costs, and providing mature technical support for quality and efficiency improvements in high-end packaging printing. Going forward, green, refined and standardized production will become mainstream trends for printing processes, and holistic solutions featuring deeply matched consumables and processes will gradually replace conventional universal production modes. With continuous popularization and iteration of this process, production standards for high-end composite printing will be further standardized, enabling more printing enterprises to tap into the high-end market and comprehensively advancing high-quality upgrading of the packaging printing industry.