Epoxy Dome Stickers is widely used in the fields of gift labels labels, electronic products and automobile labels because of its stereoscopic effect, high glossiness and durability. In practice, however, yellowing or peeling of edges is a common problem that not only affects aesthetics, but can also reduce the usefulness and service life of labels. In this paper, the causes of epoxy dome adhesive production, preventive measures and repair methods are discussed in detail in this paper.
I. Causes of yellowing edges and preventive measures
1.Oxidation Reaction Leading yellowing
The reason: Phenolic compounds in epoxy resin react with sunlight to produce yellow substances, causing the edges of labels to turn yellow. This is an inherent chemical property of epoxy resin materials, and the oxidation reaction accelerates, especially under ultraviolet (UV) light.
Preventive measures:
Choose anti-yellowing materials: When purchasing Epoxy Dome Stickers, priority should be given to epoxy resin materials with added anti-yellowing agents. These additives can effectively inhibit oxidation reactions and slow down the the yellowing process.
Avoid prolonged exposure to the sun: Avoid prolonged exposure to the sun while using or storing Epoxy Dome Stickers. They can be used indoors or outdoors, for example with a marquee or awning.
Addition UV absorbers: When preparing epoxy resin adhesives, a moderate amount of UV absorbers can be added to improve the label's UV resistance and reduce the occurrence of oxidation reactions.
2.Improper Storage Conditions cause yellowing
Why: High temperatures and humidity can accelerate the oxidation of phenolic compounds in epoxy resin, leading to yellowing of label edges. In addition, long-term storage can also cause materials to age, exacerbating yellowing.
Preventive measures:
Store in a cool, dry place: Epoxy Dome Stickers should be stored in a cool, dry place, away from direct sunlight and high temperatures. The ideal storage temperature is 20-25°C and relative humidity 40% -60%%.
Control storage time: Minimize the storage time of Epoxy Dome Stickers and avoid long-term storage. For products stored for a long time, label status should be checked regularly and aged or yellowed labels should be replaced in a timely manner.
ii. Causes of Edge Peeling and Preventive Measures
1. Improper Adhesive Selection leads to peeling
Reason: The mismatch between the adhesive and usage environment is one of the main reasons that the edge of Epoxy Dome Stickers falls off. For example, using common adhesives at low temperatures can greatly reduce stickiness, causing labels to fall off. In addition, using inappropriately sized labels on curved bottle surfaces can also lead to peeling due to large edge margins.
Preventive measures:
Choose the right adhesive: Choose the appropriate type of adhesive according to the environment in which it is used. For low temperature environment, antifreeze-specific adhesives should be used. For curved bottle surfaces, choose a strong, flexible adhesive and reduce the edge margins of the label to improve adhesion.
labeling simulation test: Prior to mass production, a label simulation tests is performed to verify the tackiness and durability of the adhesive under different conditions. Adjust the adhesive type and label dimension design according to the test results to ensure that the label does not fall off easily during actual use.
2. Poor surface treatment leads to peeling
Why: Contaminants such as oil and dust on labelled objects, or surfaces that are too smooth, can affect the adhesive's adhesion, causing the edge of the label to fall off.
Preventive measures:
Clean the surfaces of labeled objects: Clean the surfaces of labeled objects thoroughly before labeling to remove contaminants such as oil and dust. Wipe with alcohol or a professional cleaning agents to make sure surfaces are dry and clean.
Increases surface roughness: For surfaces that are overly smooth, surface roughness can be increased by polishing, blasting, etc., to improve the adhesive's adhesion. However, control the strength and duration of polishing or blasting so as not to damage the surface of the object to be labeled.
3. Improper Operation results in peeling;
Reason: Improper operation of labeling process, such as uneven force or labeling speed too fast, can cause the edges of the label wrinkle or fall off.
Preventive measures:
Standardize labeling operations: maintain uniform force and medium speed during labeling to ensure that the labeling is in full contact with the surface of the labeled object. Use labeling machine or professional tool to assist labeling, improve labeling quality and efficiency.
Follow up compaction: After labeling, press the edges of the label to ensure that the label adheres closely to the surface of the labeled object. A Compaction machines or manual compaction tools can be used for compaction treatment to improve the label's adhesion and durability.
III. Patches for yellowing or peeling edges
1. Repair Methods for Edge Yellowing
Method 1: Use deoxygenants.
Step: Apply the oxidation remover to the yellow side of the label, leave to sit for a while and rinse off. The oxidation can effectively remove the oxidized layer and restore the original color of the label.
Caution: When using deoxygenants, wear protective gear such as gloves and masks to avoid skin contact and inhalation of harmful gases. In addition, oxidation removers may be corrosive to certain materials and should therefore be tested in an inconspicuous place before use.
Method 2: Recalculations with protective layers
Step: Reset the yellowed edges of the label with a transparent protective layer, such as varnish or epoxy resin adhesive. The protective layer effectively insulates air from UV light and prevents further oxidation reactions.
Caution: When painting the protective layer, ensure that the coating is smooth and bubble-free. Choose a protective coating material that is compatible with the original label material to avoid chemical reactions that could damage the label.
2. Repair Methods for Edge Peeling
Method 1: Re-bid.
Step: Clean the outer edge of the label and reapply adhesive, then reattach securely. Ensure full contact and no bubbles between the label and the labeled object surface at the time of reseal.
Note: When relabelling, choose the same adhesive type and brand as the original label to ensure consistency and durability. Control the amount of adhesive and the reattachment force to avoid adhesive overflow or label deformation.
Method 2: Use double-sided adhesive tape.
Step: For hard-to-replace edges, secure with double-sided tape. Cut the double-sided tape to the appropriate size and clip it between the edge of the label and the surface of the object to be labeled to ensure that the label sticks firmly to the object.
Caution: When using double-sided adhesive tape, choose a product with moderate tackiness and good weather resistance. Control the adhesive area and adhesion of double-sided adhesive tape to avoid affecting the aesthetics and practicality of labels.
