Paper sacks or bags are made from paper, usually kraft paper. They can be lined with polyethylene (PE) film to make them moisture resistant. Paper sacks are commonly used to package flour, sugar, animal feed, and cement, among other things. In India, paper sacks are manufactured by a number of companies. Some of the leading manufacturers are Hindustan Paper Corporation, Andhra Pradesh Paper Mills, and Tamil Nadu Newsprint and Papers Limited. Paper sacks are made using a variety of machines. The most common machine used is the rotogravure printing press. This machine prints images or designs on the paper before it is made into a sack. Other machines used in the manufacturing process include the die-cutting machine, the laminating machine, and the heat-sealing machine. The manufacturing process of paper sacks begins with the preparation of the paper. The paper is first treated with a size press. This press gives the paper additional strength and stiffness. The paper is then passed through a rotogravure printing press. This machine prints images or designs on the paper. After the printing is done, the paper is cut into the desired size and shape. The next step is to laminate the paper. In this process, the paper is coated with a thin layer of plastic. This helps to make the paper moisture resistant. The last step is to heat-seal the paper. This seals the edges of the paper and prevents it from tearing. Paper sacks are used to package a variety of products. They are commonly used to package flour, sugar, animal feed, and cement.