[BR] Packaging method for spices[BR]
Solutions for attacking aggressive oily substances to the printed layer in turmeric powder & Pepper powder packaging Lamination Process Should be used solvent based Lamination. (Solvent Free lamination is not recommended.) Solvent based adhesives are commonly polyurethane based adhesives containing polyurethane bonds. The best adhesive in the market is “ADCOTE”, by Rohm & Hass Company. Other Dry lamination Adhesives available in Sri Lanka are, DIC India CIC Henkel Novacoat Boastic etc… But all these are not reached to “ADCOTE” Properties after the lamination. Increasing the coating weight Increasing coating weight that prevent the aggressive substances going through the Adhesive layer and attack to the printed surface. Solvent free Adhesive Thickness - around 1.5gsm Dry lamination Adhesive Thickness - around 2.5gsm (recommended) Using a special Adhesives for solvent based lamination There are so many specially produced adhesives are available for laminating Aggressive products like Turmeric powder, pepper powder etc… Ex: CAC Solvent Based Lamination Adhesives for Aggressive Volatile & non Volatile Compounds. CAS 2511 / CAC 1511A CAC 2511 - Polyurethane Based Adhesive CAC 1511A - PolyIsocyanate Adhesive Solvent – Ethyl Acetate For Packaging: Aggressive products like Soups, Spices, Pickles Detergent powder CAS 4511/ CAC 4511A For Packing Aggressive products like Lubricant oil, Hair dye, Tomato paste Fruit Juice, Naphthalene balls, Hot fill applications Using a High Barrier film to the inner layer of the package to prevent Aggressive compound going through the Films. There are so many High barrier films available in the market for our target. But when we are using a high barrier films for packaging normally the material cost becomes too high. So it is suitable with special packaging requirements. *Available Material Specification LLDPE / NYLON / LLDPE Or LLDPE / EVOH / LLDPE NYLON and EVOH reacts as the Barrier layer for aggressive substances.
Film thickness should be 40-50Mu. At least 25% of Nylon is recommended for reach acceptable properties. (25% NYLON / 75% LLDPE) [BR]
5) Suitable material combinations for packing spices 12Mu PET/ 25Mu Nylon/ 25Mu CPP (The best packing material for aggressive spices like Turmeric ,Pepper, Chilly etc.. with out using Aluminium foil) 12Mu PET / 15Mu Nylon / 25Mu CPP *12Mu PET / 50Mu Nylon sandwiched LLDPE (at least 25% Nylon Recommended) (LLDPE should have a special blend with Elite, Affinity Etc...) (Economical to the current situation) 12Mu PET / 40Mu CPP (Better for most of the non aggressive products has no longer shelf life in the market.) 30 Coex BOPP / 40 Mu Coex CPP (suitable if moisture absorption is prohibited) 30 Coex BOPP / 25 Mu Coex CPP (suitable if moisture absorption is prohibited) [BR][BR]6) With out curing the laminated materials never achieved the expected properties even in Adcote lamination. (Especially for export orders) For aggressive products – at least 7 days curing recommended. Non aggressive products- 3-5 days curing recommended.
7) When the polythene based materials and Nylon using as the barrier layers, Gloss effect of the pouch is slightly reduced. It is a disadvantage, but has good properties. 8) Nylon & EVOH has very good oil resistance and gas barrier, but don’t use as a printed surface. Ex: 25Nylon / 25 CPP Because Nylon and EVOH absorb moisture than PET & BOPP. So the best printed surface is PET. Because it has a good printability & aroma barrier too. [BR]
Prepared by P.G.D.R.Thilanka