How to avoid silicone oil transfer and foaming issues when using release paper? Nowadays, many industries use release paper. As a user, you may not be able to choose the appropriate release paper. Today, we will discuss with you some common problems that have been around for many years, so there are relatively reliable methods to prevent and solve them. This section aims to explain the reasons for these common problems and provide some suggestions to avoid or correct them.

1. Viscous film reverse transfer

When the adhesive is not on the right side of the substrate, reverse transfer of the adhesive film occurs; Due to adhesive peeling, there will be unwinding defects. The reverse transfer of the adhesive film may be caused by the following factors: adhesive exudation, uneven moisture content, improper winding tension, insufficient curing, or insufficient range of release force difference for release materials.

2. Bubbling

Foaming is a damage phenomenon on the surface of substrates, coatings, adhesives, etc. When the expansion rate of liquid (such as water or organic solvents) or gas (such as air) exceeds the rate at which the entire system dissipates its increased volume and pressure, foaming usually occurs. For example, put PE film under an excessively high temperature, PE will soften, and if the vapor pressure of the moisture in the paper is high enough, PE will form bubbles to release pressure.

3. Adhesion

When the layers of stripped material are fused together, it is difficult to lower the roll without damaging the paper or using high unwinding tension. At this point, adhesion often occurs. Adhesion may only occur in a certain part of the paper, such as the edge, or the entire paper, and may be caused by many different mechanisms.

Many people also use noise as an indicator of adhesion. This method is very subjective and cannot determine adhesion, as some coatings have inherent'Anti slip' or 'adsorption' characteristics.

4. Layering

Layering refers to the separation of layers that are bonded together through mechanical or chemical bonding at the interface.Delamination may occur at the interface between PE and paper or between adhesive and silicone oil.

Generally speaking, delamination is a matter of material and interface. Delamination is due to poor surface treatment before PE coating. The delamination of the adhesive may be due to the tendency of silicone oil to peel off.

5. Dimensional stability

Dimensional stability refers to the material being exposed to external forcesThe ability to resist dimensional changes (such as moisture, high temperature, or physical pressure). All materials will experience some dimensional changes when subjected to these external forces. The problem is how to control the degree of change and ensure that the quality of the product is not affected during processing and use.

For paper, changes in moisture profit and loss are the main issue. The dimensional stability of paper is controlled by many factors. These include fiber type and percentage, fineness, adhesion between fibers, filler content, sizing type and quantity, fiber direction, drying process, Paper density and structure. Subsequent processing also affects the dimensional stability of release paper. . Exposing the isolation film to high temperatures, especially under tension, may cause shrinkage, stretching, and even severe deformation.