I. Bookbinding Adhesive

1. Types and Characteristics

EVA Hot-melt Adhesive (Ethylene-Vinyl Acetate)

Features: Rapid curing (cooling molding), good flexibility, low cost.

Applications: Perfect binding (paperbacks), hardcover case bonding.

PUR Hot-melt Adhesive (Polyurethane Reactive)

Features: Forms high-toughness adhesive layer after moisture curing, resistant to extreme temperatures (-40℃~120℃), long service life.

Applications: High-end hardcovers, art picture albums.

Features: Eco-friendly and non-toxic, suitable for manual binding or children's books.

2. Selection Points

Page Material: PUR adhesive for art paper to prevent page detachment; EVA adhesive for lightweight paper.

Environmental Requirements: Export books must comply with eco-standards like REACH and FDA.

II. Paper bag Handle Adhesive

1. Performance Requirements

High initial adhesion: Fix handles immediately to avoid displacement.

Tensile resistance: Withstand repeated pulling (especially for heavy-duty paper bags).

Environmental protection: Non-toxic and odorless for direct hand contact.

2. Common Adhesive Types

High-strength Water-based Acrylic Adhesive

Eco-friendly and quick-drying, suitable for food packaging bags (e.g., milk tea bags, takeout bags).

Hot-melt Pressure-sensitive Adhesive (HMPSA)

Instant bonding, applicable for high-speed automatic handle pasting equipment.

Solvent-based Rubber Adhesive (phasing out)

Strong initial adhesion but contains VOCs, requiring ventilation.

3. Application Cases

Luxury shopping bags: Select high-transparency acrylic adhesive to avoid glue marks affecting aesthetics.

III. Paper Bag Seam Adhesive

1. Bonding Part Characteristics

Side seams: Require fold resistance to prevent cracking.

Bottom load-bearing: Need high shear resistance (especially for multi-layer kraft paper bags).

2. Adhesive Types

Modified Starch Adhesive

Low cost for ordinary shopping bags, but poor water resistance.

Water-based Polyurethane Adhesive (PUD)

High flexibility, withstands -30℃low temperature (e.g., frozen food packaging).

Latex (Natural Rubber)

High elasticity for high-grammage paper bags (e.g., cement bags, pet food bags).

3. Process Notes

After gluing, apply pressure (e.g., rolling or hot-air drying) to ensure bonding strength.

IV. Carton Sealing Tape

1. Classification and Features

BOPP Tape (Biaxially Oriented Polypropylene)

Standard type: Low cost for lightweight boxes (e.g., express parcels).

Reinforced type: With fiberglass addition for tear resistance (e.g., heavy equipment packaging).

Kraft Paper Tape

Eco-friendly and recyclable, suitable for green e-commerce packaging (e.g., Amazon Frustration-Free Packaging).

Cloth-based Tape

High tensile strength for irregular surfaces (e.g., pipeline packaging).

2. Adhesive Layer Types

Pressure-sensitive Adhesive (PSA): Peel-and-stick, divided into rubber-based (high initial adhesion) and acrylic-based (aging resistance).

Hot-melt adhesive coating: Requires heating activation for automatic sealing lines.

3. Selection Criteria

Adhesion: Adjust based on box material (e.g., high-adhesion glue for laminated cartons).

Environmental adaptability: Acrylic glue for low-temperature warehousing; rubber glue for high-temperature environments.

Usage and Storage Tips:

Temperature control: Hot-melt adhesives need constant-temperature melting tanks (EVA glue: ~160℃±10℃).

Substrate pretreatment: Corona treatment for laminated or inked surfaces to enhance adhesion.

Eco-certification: Prioritize water-based adhesives with FSC certification and APEO-free formulations.

Key Terms Note:

PUR: Polyurethane Reactive

PSA: Pressure-sensitive Adhesive

BOPP: Biaxially Oriented Polypropylene

VOCs: Volatile Organic Compounds

APEO: Alkyl Phenol Ethoxylates (environmental hazard indicator)

FSC: Forest Stewardship Council (sustainable forestry certification)