In the field of food and beverage, a seemingly simple self-adhesive label is actually a precise "sandwich" system composed of surface material, adhesive, and backing paper. To create a perfect "formula", it is necessary to accurately select each layer of "raw materials" based on the product packaging material, usage environment, and environmental protection requirements.
Case Details
Adhesive labels in the food and beverage industry
The adhesive labels in the food and beverage industry are a complex material system, and their "formula" (i.e. the combination of face paper, adhesive, and base paper) is "customized" according to specific application scenarios, labeling environments, costs, and regulatory requirements.
We provide a detailed interpretation of the specific materials and selection logic for each component.
1. Face StockThe surface material is the substrate of the label, which directly determines the appearance, feel, and durability.
Coated Paper:
- Characteristics: Most commonly used, low cost, good printing effect, suitable for large-scale on-site printing and bright colors.
- Treatment: The surface is usually coated with a light film (glossy or matte) to enhance water resistance and friction resistance.
- Application: paper box and bottle body in dry environment (such as white wine box and snack bag).
PP (polypropylene)/PE (polyethylene) film:
- Characteristics: It has excellent waterproof, oil resistant, crush resistant, and flexible properties. PE is softer and suitable for sticking to easily deformed bottle bodies.
- Processing: divided into bright white, sub white, transparent, silver film, etc. Transparent BOPP labels can create a "label free" appearance, which is very popular.
- Application: beverage bottles, water bottles, edible oil bottles, sauce bottles, refrigerated food packaging.
PET (polyester) film:
- Characteristics: It has extremely high strength, high temperature resistance, chemical corrosion resistance, good dimensional stability, and a stiff feel.
- Application: Products that require pasteurization or high-temperature cooking (such as beer labels, certain seasonings), and occasions with extremely high durability requirements.
Specialty Papers:
- Features: such as kraft paper, pearlescent paper, and metallic texture paper, mainly used to create specific high-end, retro, or natural brand images.
- Application: Craft beer, high-end beverages, organic food.
2. AdhesiveAdhesive is the "soul" of a label, determining how the label adheres to the surface of an object.
Characteristics: It is difficult to remove completely after pasting, and forcibly removing it may damage the label or leave adhesive stains.
Subcategory:
Universal permanent acrylic latex: the most common and suitable for most room temperature, dry surfaces.
Low temperature permanent adhesive: designed specifically for refrigerated environments, it can maintain good initial and final adhesion even at low temperatures.
High temperature resistant adhesive: can withstand high temperatures during pasteurization or steaming processes without falling off.
Characteristics: After pasting, it can be completely and cleanly peeled off within a certain period of time (usually six months to one year) without leaving any residue.
Application: Promotion labels, recyclable glass bottles (such as beer bottles), packaging that requires repeated sealing.
- Re positionable Adhesive:
Characteristics: A special removable adhesive that can be peeled off and re applied multiple times within a short period of time after labeling without losing its stickiness.
Application: Some labels that require manual adjustment of position.
3. Base paper/release paper (Liner)The backing paper protects the adhesive and provides support during die-cutting and labeling processes.
Characteristics: Most commonly used. The semi transparent kraft paper that has undergone super calendering treatment has a tight, uniform texture, tear resistance, and stable release force. Suitable for high-speed automatic labeling.
O Treatment: The surface is coated with a silicon oil layer to make the label easy to peel off.
- CCK Bottom Paper (Clay Coated Kraft Paper):
Characteristics: On the basis of raw kraft paper, a clay layer is coated, which is opaque, has high flatness, and has great strength.
Application: Usually used for labels that require high support strength, such as large logistics labels or labels with heavy surface materials.
Characteristics: Extremely thin, extremely strong, and very flat.
Application: Mainly used for ultra-thin film labels (such as printed labels for electronic products), or in situations that require extremely high die-cutting accuracy, as it hardly deforms.
How to choose a 'recipe'?
The choice of combination depends on the following factors:
1.What is the surface of the label?
- Glass/hard plastic: Most adhesives are suitable.
- HDPE/PET plastic bottles: Surface tension needs to be considered, commonly latex or specialized adhesive.
- Soft bottle body (PE): requires a flexible surface material (such as PE film) and adhesive.
- Surface with oil stains: requires high viscosity adhesive.
2. What is the usage environment?
- Room temperature drying: Copperplate paper+universal permanent adhesive+Grassin backing paper.
- Refrigeration/Freezing: PP/PE film+Low temperature permanent adhesive+Grassin backing paper.
- Moist/Condensed Water: PP/PE film+Waterproof adhesive+Grassin backing paper.
- Requires pasteurization: PET film+heat-resistant adhesive+Gracin backing paper.
3. What are the special requirements?
- Recyclable bottle: removable surface material+removable adhesive.
- High end appearance: special paper or transparent film+matching adhesive.
- High speed labeling: High strength base paper (such as CCK) and size stable surface material.
Therefore, the adhesive label "formula" in the food and beverage industry is a massive matrix system with almost infinite combinations.