Before using high-temperature resistant label stickers, it is crucial to test the type of adhesive to determine whether it is water-based or hot-melt glue. Certain adhesives may chemically react with specific substances, leading to undesirable outcomes. For instance, self-adhesive labels used on special fabrics might cause contamination under certain conditions. Similarly, temporary adhesive labels might become permanently sticky under prolonged exposure, while permanent adhesive labels might lose their viscosity on certain surfaces.
Common Issues and Solutions
Some customers have reported issues with labels not being sticky enough. The reasons for this can be complex and varied. While some customers may assume the stickers are of poor quality, the reality is often different. Our self-adhesive label materials are sourced from reputable manufacturers and undergo strict quality control. However, issues can arise if customers fail to clarify their adhesion requirements or conduct trial tests before application. Below are three key metrics to evaluate adhesive performance:
Initial Adhesion: Commonly tested using the rolling ball method. The adhesive side is fixed on an inclined surface, and steel balls of varying sizes are rolled down. The larger the ball that sticks, the greater the initial adhesion.
Permanent Adhesion: Labels are used to bond two standard steel plates with hooks. One plate is hung on a fixed frame, and a 2kg weight is attached to the other end. The test measures how long the lower plate remains attached.
Peel Strength: The label is adhered to a standard steel plate and removed at a constant speed using specialized equipment. The force required to peel the label is its peel strength.
10 Tips for Selecting High-Temperature Resistant Self-Adhesive Labels
Consider the Adhesive Surface Material
Self-adhesive labels can be applied to various surfaces, including glass, metal, cardboard, and plastics (e.g., PVC or HDPE). The performance of the label varies significantly depending on the surface material. Therefore, it is essential to select a label adhesive that is compatible with the surface of your product.
Evaluate the Shape of the Adhesive Surface
Labeling surfaces can be flat or curved. For surfaces with a significant curve (e.g., medicine bottles with a diameter of less than 3cm), choose labels with excellent conformability or high-tack adhesives.
Assess the Cleanliness of the Adhesive Surface
Self-adhesive labels perform best on clean, dry, oil-free, and dust-free surfaces. For surfaces that are uneven or contaminated, specialized label materials may be required.
Account for Environmental Conditions
Environmental factors such as temperature, humidity, and exposure to UV light or chemicals can affect adhesive performance. For example, labels used outdoors, in high-temperature environments, or near car engines must withstand extreme conditions. In the electronics industry, PCB circuit board labels must endure temperatures up to 350°C.
Choose Between Permanent and Removable Adhesives
Adhesives are categorized as either permanent or removable. Permanent adhesives offer strong bonding and are difficult to remove, while removable adhesives are easier to detach but provide weaker adhesion.
Consider Printing and Processing Methods
The choice of label material should align with the printing method (e.g., flexography, offset, thermal transfer, or laser printing) and processing method (e.g., roll-to-roll, sheet-to-sheet). Conduct tests under the same printing, processing, and labeling conditions to ensure compatibility. High-quality printing requires smooth, durable label materials.
Determine the Required Storage Time
Different applications require varying storage durations for labels. Some need long-term durability, while others are temporary. Select labels that meet your specific storage requirements to avoid unnecessary costs.
Avoid Adhesive Bleed-Out
Soft PVC and PET barcode labels are prone to plasticizer exudation, also known as adhesive bleed-out. For such materials, opt for water-based adhesives, as hot-melt adhesives are more likely to bleed.
Verify Barcode Label Size
Always conduct practical tests to ensure the barcode label size is appropriate for your application. This prevents issues such as labels being too large or too small for the intended use.
Perform Labeling Machine Tests
Before finalizing your purchase, test the labels in an automatic labeling machine to evaluate their performance, including application smoothness and adhesion consistency.
