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Hotmelt

Hotmelt adhesives commonly used in textile are one-component solvent-free thermoplastic polymers (non-reactive) or thermoset pre-polymers (reactive) heated to melting point prior to their application.

HOTMELT adhesives machine

The process called coating.

Hotmelt are applied onto a substrate material such as woven, knits, nonwovens, foams, membranes, films, nets, silicon paper, etc. in hot plasticized state.

There are applications where material is only coated for changing the surface of the material, but more often the purpose is to bond or glue two layers of material together to build a composite material, a laminate, hence, the bonding process is commonly called lamination.

All plants are equipped with low tension web transport drives and tensions are measured with load cells and dancers. Control system can be regulated according to the setpoints. Several web guiding systems ensure a proper alignment of the web layers for coating ad lamination. Accumulators (J-box, roll and belt) ensure an on-going process with no stop during batch changes.

Description

Optional auxiliary equipment: Cleaning unit for the rollers, oil heater, water cooler

THERMOSET (DUROPLASTIC) HOTMELT ADHESIVE

One-component, moisture curing/ crosslinking reactive polyurethanes, with:

• Typical working temperatures 90-130°C

• Viscosity range 3’000-35’000 cps

Thermoset hotmelt adhesives are applied hot, in plasticized state, same as the thermoplastic adhesives, but they are not cross-linked at the time of application. The adhesives cross-link with humidity over a time period of some hours to two days, depending on the polymers. Contrary to thermo-plastics, these adhesives are not plasticized again when they are re-heated. The process is not reversible.

Required auxiliary equipment: tank or drum melter

THERMOPLASTIC HOTMELT ADHESIVES

coPA, coPES, PSA, EVA, with:

• Typical working temperatures 150-230°C

• Viscosity range 3’000-150’000 cps

Thermoplastic hotmelt adhesives are in plasticized form whenever they are heated and solid when cooled. The process is fully repeatable and reversible. Under higher temperatures, the bonding strength will be decreased. However, there are thermo-plastic hotmelt adhesives that can withstand temperatures above 200°C and they are well accepted in the industry.

Required auxiliary equipment: extruder or tankmelter

 

Any type of textile and non-textile webs can be laminated together, such as:

  • woven fabrics
  • knitted fabrics
  • nonwovens
  • membranes, films
  • foams

Coating methods:

  • Rotogravure
  • Rotary Screen
  • Multiroll

Slot Die/Spray Coating.

Technical data

Cavimelt

THERMOSET (DUROPLASTIC) HOTMELT ADHESIVES
One-component, moisture curing/ crosslinking reactive polyurethanes, with:

  • Typical working temperatures 90 – 130°C
  • Viscosity range 3’000 – 35’000 cps

Thermoset holmelt adhesives are applied hot, in plasticized state, same as the thermo- plastic adhesives, but they are not cross-linked at the time of application. The adhesives cross-link with humidity over a time period of some hours to 2 days, depending on the polymers. Contrary to thermo-plastics, these adhesives are not plasticized again when they are re-heated. The process is not reversible.

Required auxiliary equipment
tank or drum melter

THERMOPLASTIC HOTMELT ADHESIVES
coPA, coPES, PSA, EVA, with:

  • Typical working temperatures 150 – 230°C
  • Viscosity range 3’000 – 150’000 cps

Thermoplastic holmelt adhesives are in plasticized form whenever they are heated and solid when cooled. The process is fully repeatable and reversible. Under higher temperatures, the bonding strenght will be decreased. However, there are thermo-plastic hotmelt adhe- sives that can withstand temperatures above 200°C and they are well accepted in the industry.

Required auxiliary equipment
extruder or tankmelter

Field of Application

Fields of application

  • active wear (outdoor)
  • functional and protective clothing
  • automotive interiors
  • home textiles, upholstery, mattress ticking • hygiene and medical products
  • fusible interlinings
  • technical composites

Any type of textile and non-textile webs can be laminated together, such as:

  • woven fabrics
  • knitted fabrics
  • nonwovens
  • membranes, films
  • foams

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