How To Choose The Right Label Adhesive

 

In adhesive printing, the selection of the adhesive has a direct impact on the printing quality. Different adhesives will result in differences in the stickiness of the adhesive, which in turn affects the printing outcome. Therefore, choosing the appropriate adhesive is of great significance. This article will provide a detailed introduction on how to select the most suitable adhesive for you.

 

 

 

 

1. The Different Types of Labels

First of all, I will introduce several commonly used adhesive for you.

(1) permanent Adhesive. It is a type of adhesive designed to create long-lasting, strong bonds between materials that are not intended to be separated under normal conditions.

 

(2) Removable Adhesive. This kind of label adhesive leaves minimal to no sticky residue upon removal. Removable adhesive is specifically formulated for short-term or temporary applications, with the key design goal of avoiding damage to the underlying surface when it is peeled off. It purpose is to enable easy, clean removed without harming the substrate, making it ideal for situations where temporary bonding is needed.

 

(3) Repositionable Adhesive. These label adhesives work well for removing and reusing labels on products, especially large items requiring flat, uniform application. Removable labels let end users position them precisely as needed. Sticky notes are a common example of products using such repositionable adhesives.

 

(4) Hot-melt adhesive. This adhesive is tacky when heated and solidifies within seconds to a minute. Hot-melt adhesives can also be applied via dipping or spraying, and are favored by hobbyists and crafters for both bonding and as an affordable substitute for resin casting.

 

2. Label Adhesive Performance Features

The adhesive used for labels can have different properties, even if they are classified as the same "type". Therefore, for your enjoyment and curiosity, we have outlined some basic characteristics that can help determine the performance of the adhesive.

 

(1) Initial Tack: The immediate holding force when the label adhesive comes into contact with a specific surface. If the initial stickiness is low, the adhesion will be weak, allowing the label to be removed cleanly. Adhesives with low initial stickiness will build adhesion over time. Meanwhile, adhesives with high initial viscosity will have greater adhesion and will bond to the container more quickly.

 

(2) Shear Resistance: Put simply, labels with low shear adhesives are soft, so they can seep into the surface they're applied to. They also have pretty high initial stickiness, but they break down more easily under pressure. High shear adhesives are more stable-they don't flow into the surface, which means they start with less stickiness but hold up better under pressure.

 

(3) Ultimate Adhesion: This refers to the strongest holding power a label reaches once the adhesive fully bonds to the surface. The time it takes for an adhesive to achieve this ultimate adhesion varies, depending on things like the adhesive's stiffness, how rough the surface is, and environmental conditions. Based on these factors, ultimate adhesion can take anywhere from 2 to 24 hours.

 

3. What Factors Should I Consider When Looking for an Adhesive?

When choosing adhesive labels for particular uses, multiple factors need to be taken into account to guarantee ideal performance, compatibility, and appropriateness. Below are some main points to consider when selecting adhesive labels.

 

(1) Application Surface: Take into account the surface features of the application surface, such as texture, porosity, and curvature, and pick adhesive labels that are compatible with the surface material and conditions. Perform adhesion tests on sample surfaces to confirm compatibility prior to large-scale production.

 

(2) Environmental Conditions: Take into account the environmental circumstances that adhesive labels will be subjected to, including extreme temperatures, humidity levels, UV exposure, and chemical contact. Select labels with adhesive qualities that match the anticipated environmental conditions to ensure durable performance.

 

(3) Application Requirements: Assess the application needs, including durability, permanence, removability, and readability, and pick adhesive labels that satisfy these needs. Choose labels with adhesive traits and material features that correspond to the intended application and usage.

 

(4) Budget：Take budget limits and cost factors into account when choosing adhesive labels for specific uses. Assess the overall cost of label manufacturing, including materials, printing, finishing, and labor, and select labels that provide the best return on investment.

 

4. Matching Label Type to Product Characteristics

Different types of label adhesives have distinct application scenarios due to differences in composition and performance. Next, I will list several common scenarios for the use of various adhesives.

 

(1) Permanent Adhesive: Permanent adhesives possess excellent bonding properties, enabling them to form strong bonds between various materials, such as metals, plastics, and rubbers. Whether it is bonding of the same materials or different materials, permanent adhesives can provide reliable bonding results. This makes them widely used in industrial production, such as in automobile manufacturing and electronic equipment assembly.

 

(2) Removable Adhesive：Considering the removable property of this adhesive, it is suitable for scenarios where information needs to be changed frequently or for short-term use. For instance, warehouse logistics, temporary labels for events or temporary labels for offices. It is worth noting that in the medical field, removable adhesive tape has become the preferred choice due to its unique properties.

 

(3) Repositionable Adhesive: This type of adhesive is commonly used in the design and creative fields. It enables multiple trial-and-error processes and meets the flexibility requirements during the creative process. Similarly, it is also frequently used in teaching activities and can be reused repeatedly. Suitable for scenarios where frequent position adjustments are required.

 

5. Common Misuses of Label Adhesives and Their Solutions

Label adhesives play a critical role in ensuring labels remain intact, legible, and functional throughout a product's lifecycle. However, missteps in adhesive selection, application, or environmental adaptation often lead to issues like label lifting, residue, or failure. Below are the most common misuses of label adhesives and practical solutions to address them.

(1) Misalignment of Adhesive Type with Product Surface Characteristics

Problem Description
① Labels peeling off smooth, low-surface-energy substrates (e.g., PE/PP bottles, Teflon-coated surfaces).
② Adhesives failing to penetrate porous surfaces (e.g., corrugated cardboard, uncoated paper), resulting in weak adhesion.

Solutions
① Match adhesives to surface energy: For low-energy substrates (PE/PP), use acrylic-based adhesives with modified formulas (e.g., with polar monomers) to enhance wetting and bonding. For ultra-low-energy surfaces (e.g., silicone rubber), opt for silicone-based adhesives.
② Opt for porous-specific adhesives: For porous materials (paper, cardboard), choose rubber-based or high-tack adhesives, which penetrate pores to form mechanical anchoring.
③ Surface pretreatment: For extremely smooth or contaminated surfaces, lightly clean with alcohol (to remove oils) or apply a primer to increase surface energy before labeling.

(2) Incompatibility with Label Substrates or Printing Processes

Problem Description
① Adhesive solvents dissolving water-based inks, leading to smudged text or graphics.
② Stiff adhesives causing thin film labels (e.g., BOPP) to curl or warp after application.

Solutions
① Test for chemical compatibility: Prior to mass production, conduct adhesion tests with the chosen label substrate and ink. For water-based inks, use water-based or low-solvent adhesives to avoid dissolution.
② Pair flexibility with flexibility: For flexible labels (e.g., BOPP, PVC films), use soft, low-modulus acrylic adhesives that bend with the substrate, reducing curling risk. For rigid substrates (e.g., glass, metal), rigid adhesives are acceptable.

 

6. Making Your Final Adhesive Decision

With knowledge of various label adhesive types and your options tailored to different potential applications, you can begin determining the ideal label adhesive for your products.

 

(1) Begin by selecting the substrate or surface material where your label will be applied. Based on the product's environment, storage conditions, and end application, various label types will deliver differing performance levels.

 

(2) Next, you'll need to pick the appropriate type of adhesive. Removable adhesive labels work well for consumer products and medical devices, leaving no residue on the item. Permanent adhesive labels are better suited to electronic components, food products, and other specialized items that need safety indicators or similar warnings for end users.

 

(3) Your label is more than just material and adhesive, you also need to select the right colors, including logo and product information placement, to craft an eye-catching label.

 

(4) Certain product labels may require laminate or finishing material to shield them from chemical exposure, temperature and humidity fluctuations, or UV radiation.