Energy savings plus mechanical reinforcement and rheology control

EVA Carton Sealing Hot Melt Adhesive for Low Temperatures

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Base Polymer

Ethylene Vinyl Acetates (EVA)

Applicable Industrial Sectors

Papers & Packagings

Applicable Base Polymer Properties

Hot melt EVAs are made from a combination of solid thermoplastic copolymers, tackifying resins, and waxes that function with the right viscosity when applied in the bookbinding operations. EVA adhesives demonstrate strong adhesive properties, but most importantly they set quickly by virtue of their hot melt character.

The source of EVA Carton Sealing Hot Melt Adhesive for Low Temperatures formulation is Adhesives Formulary Handbook, NIIR Board, Asia Pacific Business Press, Inc., 2010, p. 267.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Polyterpene tackifier resin (Zonarex B-115, Arizona Chemicals)

xxxx

Microcrystalline wax (74°C mp)

xxxxx

Ethylene vinyl acetate (28% vinyl acetate, 25 melt index)

xxxx

Ethylene vinyl acetate (28% vinyl acetate, 400 melt index)

xxxx

Typical Properties

Properties

Sealing Temperature, °C

xxx

Viscosity at 177°C, cps

xxxx

Tensile strength, psi

xxx

Kraft to Kraft Adhesion (oz/in)

Kraft to Chipboard Adhesion (oz/in:)

Processing

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Resulting Properties

A starting formulation for an EVA hot melt formulation commonly used for cartons and folding boxes that will experience low service temperatures is given in the table above. EVA resins are considered to be relatively safe to use in food applications. Certain adhesive manufacturers offer EVA resins that are approved for indirect food contact (FDA 21 CFR.175) applications.

This specific formulation listed above has been found to provide:

Excellent tack
Fast set-up time
Good adhesion to cellophane, paper, aluminum, and many other packaging films
Poor adhesion to polypropylene
Recommended for use as a pre-applied heat sealable carton adhesive or for closing packages on a carton closing machine.

Tips and Tricks

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