Lamination

A roll-to-roll laminating machine is a machine specifically designed for processing roll materials, capable of continuously laminating and surface-treating various roll materials. It operates by simultaneously unrolling the upper and lower layers of material from the roll, applying adhesive, heating, and pressing to achieve a tight bond, and then rewinding the roll after lamination, forming a continuous and highly efficient production process.

Compared to conventional laminating machines, roll-to-roll laminating machines enable uninterrupted processes, making them particularly suitable for mass production. This effectively reduces time and labor costs while improving product quality stability. Widely used in packaging materials, electronic films, decorative films, and optoelectronic materials industries, they are a key piece of equipment in modern functional film manufacturing processes.

Roll-to-roll laminating machines are widely used in the manufacturing processes of various roll materials, and are particularly suitable for industries requiring continuous and high-efficiency lamination. Their greatest advantage lies in their ability to accurately laminate different materials (such as plastic film, paper, and metal foil) at high speeds, improving production efficiency and reducing human error.

Roll-to-roll laminating machines have practical applications in many industries, such as:

• Electronics industry:Protective layer bonding in flexible electronic components, touch panels, and LCD displays.
• Packaging industry:Such as the combination of bottle labels, food preservation film, and protective plastic film.
• Paper manufacturing industry:Special Purpose Paper and Wallpaper Surface Treatment
• Printing and Decoration Industry:In-mold decorative film (IMD), out-of-mold decorative film (OMD)
• Medical equipment:Preparation and bonding of materials such as medical patches and bio-detection strips

These applications all require high bonding precision and stability, especially when products have strict requirements for appearance, transparency, and adhesion. Roll-to-roll lamination equipment can provide stable and repeatable processing conditions, providing strong support for mass production.

The gravure rotary laminator is a continuous process equipment that combines gravure coating and lamination functions, specifically designed for roll materials. This machine can uniformly apply adhesives or functional coatings to the substrate surface while operating at high speed and immediately complete the lamination process. It is widely used in the manufacturing of functional films, optical materials, and electronic materials.

Sage Intelligent uses gravure roller laminators, which are further combined with Micro Gravure coating technology to achieve simultaneous coating and lamination in a roll-to-roll mode, greatly improving production efficiency and stability. It is especially suitable for high-precision and mass production.

• Material wrinkling or bubbling:Uneven bonding may result from improper tension control or inconsistency between bonding speed and temperature settings.
• Poor adhesion and peeling:This is commonly caused by insufficient adhesive application, incomplete drying, or insufficient bonding pressure.
• Incomplete adhesive transfer:If the adhesive coating is not uniform or the viscosity is unsuitable, the transfer may be incomplete, affecting the bonding strength.
• Warping or curling after application:This is caused by differences in the thermal expansion coefficients of the substrates or uneven drying/cooling.
• Misalignment or offset:Improper adjustment of the alignment mechanism or unstable tension of the roll material during operation can cause layer misalignment.
• Inconsistent coating thickness:The problem could be due to wear on the coating head, viscosity fluctuations, or inaccurate equipment settings.

To ensure consistent bonding quality and high product yield, laminating machines must operate in a clean environment with controlled temperature and humidity. Sage Intelligent Manufacturing has its own cleanroom, which effectively controls the process environment, providing customers with stable and high-quality laminating services.

• Temperature control:It is recommended to maintain the operating temperature between 20 and 28°C to avoid affecting the adhesive performance due to temperature changes.
• Humidity control:The relative humidity should be maintained at 50%±10% to avoid the material getting damp or generating static interference.
• Cleanliness:It must be operated in a low-dust environment to avoid foreign objects interfering with the bonding quality, and the equipment and space must be cleaned regularly.
• Ventilation and exhaust:If solvent-based adhesives are used, a good ventilation system should be provided to ensure operator safety and production stability.
• Ground and machine stability:The laminating machine must be installed on a flat and stable foundation to reduce offset errors caused by vibration during operation.

The materials used in the lamination process vary depending on the product's function and application requirements. Taking roll-to-roll gravure roller laminators as an example, common lamination materials can be broadly categorized as follows:

Substrate type (as the main body for lamination or coating):
Various plastic films, such as PET, PE, PVC, PMMA, PI, and ABS, have different physical and chemical properties and are commonly used in electronic materials, optical components, and water transfer printing films.

• Paper and aluminum foil:Suitable for packaging, decoration, conductive or barrier applications.
• PVA (water-soluble film):It is commonly used in water transfer printing films and soluble applications, and can also be laminated with other film materials to improve strength and processing stability.

Functional membranes or processed membranes:

• Protective film:Provides surface protection such as scratch resistance, dust resistance, and antistatic properties.
• Optical film:It has optical effects such as diffusion, shielding, brightening, and anti-reflection.
• Metal film or composite film:It has functions such as conductivity, shielding, and barrier.

Adhesive (glue):
Commonly used adhesives include acrylic glue, water-based glue, PU glue, and hot melt glue, depending on the material properties and bonding conditions.

Sage Intelligent uses a gravure roller laminator, combined with Micro Gravure coating technology, which can precisely control the coating thickness and perform continuous roll-to-roll lamination.

Coating thickness is affected by parameters such as linear speed, coating pressure and liquid viscosity. By optimizing the settings, our equipment can stably achieve a coating thickness between 1 and 20 μm.

The material's width processing capability supports a range of 400 to 1300 mm, which can be flexibly adjusted according to different product requirements, and is suitable for various functional film processes and customized applications.

Designed for continuous roll-to-roll processing, it has no explicit limitations on length, making it particularly suitable for large-scale, stable, continuous production needs.

Sage's bonding equipment uses a roll-to-roll continuous process, which is theoretically unlimited in terms of material length. As long as the material can be supplied stably and the tension can be controlled, it can operate continuously for a long time.

To ensure stable machine operation and consistent product quality, our roll-to-roll laminating machine recommends a minimum inline length of 200 meters. This setting reduces tension variations and quality deviations caused by short-distance processing, ensuring overall process efficiency and finished product stability.

Sage uses a gravure roller laminator with Micro Gravure coating technology, which supports precision coating of medium to low viscosity liquids. The applicable range is approximately 50 to 3000 cps (centipoise), which corresponds to a test range of approximately 12 to 18 seconds for the Iwata No. 3 cup.

This viscosity range covers most water-based and solvent-based coatings, such as functional coatings, scratch-resistant coatings, and adhesives. By strictly controlling coating parameters (such as coating speed, doctor blade pressure, and bath temperature), stable and consistent coating quality can be maintained even under high-precision requirements.

If you have special viscosity or functional coating requirements, please feel free to contact us. We can provide customized coating testing and solutions.

Solid content refers to the proportion of solid components in the total volume of liquid coating. This proportion directly affects the thickness, drying efficiency, and performance of the finished product after coating and bonding.

In the bonding and coating process, coatings with higher solid content leave more solid matter after drying, forming a thicker film, which helps improve adhesion and functional performance (such as barrier properties and scratch resistance). However, these coatings usually require a longer drying time during the coating process and are also prone to affecting coating uniformity due to their higher viscosity.

In contrast, coatings with lower solids content, although drying faster and with better flowability and surface smoothness, produce a thinner film after drying, which may affect adhesion and the thickness of the final functional layer.

Therefore, Sage Intelligent will precisely adjust the solid content ratio and related coating parameters (such as speed, temperature and drying settings) according to product requirements, coating characteristics and equipment conditions during the bonding process to ensure stable coating and bonding quality and ultimately achieve ideal product performance.

In the lamination process, air bubbles are a common defect affecting the appearance and performance of products. To avoid air bubble formation, efforts must be made in several aspects, including equipment adjustment, material selection, and environmental control.

• Coating uniformity:
  Sage employs Micro Gravure technology, which precisely controls coating thickness and uniformity, preventing bubble buildup caused by uneven coating distribution.
• Fitting pressure and tension control:
  By precisely adjusting the pressure of the pressure rollers and the roll-to-roll tension, a tight seal between the bonding surfaces is ensured and air is allowed to escape smoothly, effectively preventing residual air.
• Defoaming treatment of coatings:
  If the coating undergoes proper degassing treatment (such as standing or vacuum degassing) before use, the amount of gas entrained in the coating itself can be reduced.
• Stable environmental conditions:
  Operating in a clean environment with controlled humidity and temperature reduces the likelihood of air and moisture entering the coating or bonding interface and causing air bubbles. Sage has cleanrooms to enhance process stability.
• Choose suitable adhesives and materials:
  The viscosity, open time, and wettability of the adhesive affect the degassing capacity. Using the right membrane material and adhesive helps to expel and suppress air bubbles.

If wrinkles appear in the product during the bonding process, it is usually related to the following factors:

• Improper tension control:
  If the tension of the roll-to-roll laminating machine is uneven or changes too much during operation, it can easily cause the material to deviate, pile up, or loosen, resulting in wrinkles.
• Poor matching of application speed and pressure:
  Excessive speed, insufficient pressure from the pressure rollers, or uneven pressure distribution during lamination can all cause material displacement or wrinkles during the lamination process.
• The flatness of the material itself:
  If the substrate or film material used has warped or wrinkled during winding or storage, these defects are easily amplified after lamination.
• Environmental and static electricity effects:
  Low ambient humidity or ineffective elimination of static electricity can cause the film to stick or adhere during feeding, affecting alignment and flatness.
• Machine setup and alignment calibration:
  Infrequent equipment maintenance or insufficient alignment accuracy can also increase the incidence of wrinkles.

Sage's intelligent roll-to-roll tension control system, precise pressure roller structure, and comprehensive machine calibration effectively reduce wrinkle occurrence and ensure consistent bonding quality. For customized needs, we can also assist in adjusting process parameters and providing material recommendations.