Adhesives for Laminating

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Cattie Adhesives has deep market application knowledge of Laminating adhesives based on VAE- PVA – PVOH water based adhesives and 100% Solids hot melt and PUR technologies.

 

We have expertise in formulating Custom Adhesives based on polyurethane and hot melts, based on EVA, APAO, metallocene and polyethylene chemistry.

Laminating Adhesives – Types of laminates, primers, tie layers, for dry , wet bonding,  extrusion lamination

  • One and two part water-based adhesives based on VAE, PVA, acrylic emulsion and polyurethane EVA dispersions.
  • One part moisture cure reactive polyurethanes PURs 100% solids PUR hot melts.
  • One and two part water borne adhesives based on VAE, PVAc, PVOH, Acrylic, SBR and other Latex copolymers
  • Hot melts for lamination based on EVA, APAO, Polyethylene ,metallocene

Application Methods

  • Direct gravure, reverse gravure
  • Flexo
  • Smooth Roll
  • Differential roll coaters , slot coaters
  • Extrusion coaters
  • Coex  and tandem lamination extruders
  • Smooth roll laminators 3,4,5 roll systems

Dispensing – Laminating equipment

  • Meter mix  dispensing units  from Graco, Liquid Controls, Dopag, Pyles, Valco
  • Drybond wet bond  laminators  Faustel, PCMC, Inta Rota, Black Bros glue spreaders

Markets Covered and typical structures

  • Snack, dry food  and confectionery   PP/PP, PP/ MET/, Cello/Cello
  • Fabric / fabric , Fabric / film ,foam (PU,EVA,EPS)
  • Fresh cut produce   PP/PP, PE/PE
  • Aqueous ,snack, and condiment   PET/PE, PP/PE, METPET/PE
  • Meat and cheese  PET/PVDC//PE, Nylon/PVDC//PE, METPET//PE
  • Confectionery, Coffee, Coffee Brick Packs  METPET/PE, PP/Nylon/Foil/PE
  • Steam Autoclave, ETO pouches  Medical  PET/Cast PP
  • Decorative Bags Overlays  Paper/PP, or METPP, Acetate , PET
  • Industrial  PET/PE, PET/Foil, wood working HPL

For more detailed information on our complete line of Laminating Adhesives, to speak with a technical representative about your application, and to request samples, please call us at 1-800-249-0337 or email us sales@cattieadhesives.com

Cohesive adhesive

Synthetic Latex Cohesive versus Natural Rubber Latex Cohesive

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How to use Cohesive

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How to use Cohesive – A Guide for using Synthetic or Natural Latex-Cold Seal Cohesive

Cohesive Bandage

General Converting Suggestions

– All new laminate structures should be qualified and approved by end use customer prior to full-scale production.

– All new OPV, release lacquers, inks, paper, films should be qualified prior to full-scale production.

Cohesive Handling Suggestions

– All cohesive should be rotated based on date received, oldest material should be used first.

– For best results, we recommend that product be used within three months.

– Only specified defoamers at specific percentages may be added. Any addition of anything else may interfere with adhesive performance.

 

Proper Cohesive testing

1) Run coat weight checks.

– Ideal coat weights are 2.4 – 3.7lbs/Ream. As always check coat weights on a regular basis.

 

2) Peel and seal ability testing.

– Peels and seal ability testing must be run initially, 24 hours, 7, 30, 60 and 90 days to insure performance over time.  Peel values should retain 75% of un-aged values over 90 days.  This is the bare minimum maintenance to guarantee performance.  It is the user’s responsibility to verify cohesive performance before selling product.

 

3) Blocking testing

– Blocking test should be run according to customer specification.

– Ensure that OPV, ink, paper, or film is not interfering with cohesive.

– Check peel and sealability test to see if any of the above are interfering.

 

4) Cohesive web storage

– Finished web should be wrapped in poly bags. Avoid direct light- UV oxidizes product.  Cohesive will lose auto adhesion capabilities.

– Humidity plastisizes cohesive increasing auto adhesive and block potential.

– Lack of humidity hardens cohesive requiring higher pressure, and heat to get required cold flow to make a bond.

 

5) Defoaming

– Use only Cattie recommended defoamers. For best results atomize or spray at the pan. Never add silicone based defoamers.

Adequate Tests

Although we believe that adherence to the above suggestions will result in optimum adhesive performance, it is impossible to evaluate all possible combinations of film/paper/OPV/printing inks/coating for adhesion performance.

Therefore, the suggestions herein are made without guarantee or representation as to the results.  We strongly recommend that adequate test be made in your plant to determine the suitability these adhesives and measure their performance for you intended use, and determine their acceptance for various end-use requirements.

It is particularly important to conduct testing when there is any change in film, paper, coating, printing ink, OPV or your process.

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Hot Melt – Trouble Shooting Tips

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Problem Possible CauseSuggested Solution
StringingApplication temp. too lowRaise application temp. DO NOT exceed recommended application temp.
Viscosity of adhesives is HIGHRaise application temp. DO NOT exceed recommended application temp.
Substrate is too far from applicator tip.Position substrate closer to tip.
Substrate temp. is too coldPre-warm substrate to increase surface temperature.
Poor nozzle shut offClean Nozzle and repair. If problem persists, contact equipment manufacturer.
Charring/Gelling in ReservoirReservoir temp. too highLower reservoir temperature
Faulty heating controlCheck control and replace
Surface oxidationMaintain level of adhesive in reservoir. Keep reservoir covered; with some adhesives, nitrogen blanket may be necessary.
Dripping NozzleWorn needle or seatReplace
Nozzle dirtyClean or replace
Air in Adhesive at Applicator TipExtrusion head faultyConsult with the manufacturer for a recommendation
Reservoir is out of adhesive.Bleed lines and refill reservoir. Reset or replace valve.
Poor AdhesionAdhesive bond shows that the glue film is mostly on one surface which is caused by improper penetration of the secondary surface.A) Apply heavier glue film and/or apply adhesive hotter. Sometimes both approaches are necessary.

B) In the case of very conductive surfaces (metals) the substrate may have to be preheated to assure proper penetration of the secondary substrate.
Bond failure shows adhesive on both surfaces with leggy strains.Usually caused by disturbing the Bond during the setting stage.A) Check compression to assure that there is no shifting during adhesive set up.

B) Apply less adhesive.

C) Lower adhesive Temperature.
Poor penetration of substrate coatingA) Apply adhesive hotter.

B) Combine substrates quicker.

C) Lower adhesive temperature.
Glossy adhesive surface usually caused by poor contact with the secondary substrate. Temperature too low for proper wet out.A) Adjust compression to assure intimate contact of substrates.

B) Increase adhesive temperature.
Substrates Popping openHot melt is not cooling rapidly enoughA) Lower application temperature.

B) Decrease amount of adhesive applied.
Substrate is too hot to achieve proper cooling of adhesiveCool substrates to room temperature if possible.

For more detailed hot melt trouble shooting tips, or to speak with a technical representative about your application, and to request samples, please call us at 1-800-249-0337 or email us at sales@cattieadhesives.com

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