The common quality problems in the production process of oil-proof paper bags mainly come from two aspects: product quality problems caused by the problem of the oil-proof paper material itself; Another issue is the quality of the production process and the environmental impact of oil-proof paper bags. The following will be elaborated separately:

1. The problem with the material of the oil-proof paper bag itself

As a printed product, the properties of the coated paper itself, the performance of the ink, and the density of printed images and texts all affect the quality of oilproof paper bag printing. If printing on film-coated paper with poor uniformity, the amount and speed of ink absorption within the format may vary; It can cause quantitative changes in the tightness, evenness, smoothness, and moisture content of the paper. If the ink printing layer is too thick or thick, the wetting, diffusion, and penetration ability of the adhesive molecules will be poor, and the movement of molecules between them will not be very active, resulting in a small mechanical bonding force.

2. The influence of process operation and printing environment on the quality of oil proof paper bags

When coating the oil-proof paper, apply a layer of adhesive on the surface of the plastic film. Although it has been dried, it still cannot meet the requirements for coating. In this case, increasing the solvent to dilute the adhesive concentration is adopted for quick drying, but if the moisture content is too high, air bubbles may appear during pressure lamination, peeling, and peeling. At the same time, the film is prone to adsorbing substances such as oil, moisture, and dust in the air, thereby reducing its surface function. Excessive humidity can also affect the volatilization of solvents in the adhesive. Too much residual solvent can create air isolation in the film, making it difficult to adhere. At the same time, uneven roller pressure, uneven rubber rollers, and dirt on the rollers can all cause wrinkles during film coating.