Low coat weight papers are becoming increasingly popular for a variety of applications that do not require the same level of durability and quality as standard coated fine (wood free coated) papers. These lightweight papers are often used for products such as books, directories, timetables, and brochures.

One of the defining characteristics of low coat weight papers is their basis weight, which typically ranges from 55 to 135 grams per square meter. This weight allows for a thinner and more lightweight paper that is still able to meet the needs of less demanding applications.

In addition to their lower basis weight, low coat weight papers also have a lower coat weight per side. This refers to the amount of coating applied to the paper during the manufacturing process. Coat weights for low coat weight papers typically range from 3 to 14 grams per square meter per side. This lower coat weight helps to keep the overall weight of the paper down while still providing some level of coating for improved printability and appearance.

The total pigment content in low coat weight papers can vary from 20% to 35%. Pigments are added to the paper during the manufacturing process to enhance its color and appearance. The specific pigment content can vary depending on the desired look and feel of the final product.

Low coat weight papers are available in both sheet and reel form. Sheets make up the majority of low coat weight paper products, accounting for approximately 70% of the market. These sheets are typically cut to size and used for applications such as books and brochures.

Reels, on the other hand, are large rolls of paper that can be used for continuous printing and manufacturing processes. Reels of low coat weight paper are often used in high-volume applications where efficiency and productivity are key.

The production process for low coat weight papers varies depending on the specific grade. Single coated grades are produced using either on-blade or off-blade coaters. These coaters apply a thin layer of coating to one side of the paper, resulting in a single coated paper with improved printability and appearance.

Pigmented grades of low coat weight papers are produced using sizers. Sizers are machines that apply a mixture of pigments and binders to the paper surface. This process creates a pigmented coating that adds color and vibrancy to the final product.

In conclusion, low coat weight papers offer a lightweight and cost-effective solution for applications that do not require the same level of durability and quality as standard coated fine papers. With a range of basis weights, coat weights, and pigment contents available, these papers can be tailored to meet the specific needs of various industries and applications. Whether in sheet or reel form, low coat weight papers provide a versatile and efficient option for printing and manufacturing processes.