Compostable laminated packaging material
OwnerJeanne Cloutier, Shaun Ashworthinventors
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Abstract
A laminated packaging material biodegradable under uncontrolled composting conditions comprises a bioplastic sealant layer compostable under uncontrolled composting conditions, and a cellulose barrier layer compostable under uncontrolled composting conditions, wherein the barrier layer is bonded to the sealant layer with a water-based dry bond adhesive including a hydroxyl or an aziridine cross-linking coreactant and having polyurethanes or acrylics only in concentrations less than 0.1% of the dry weight of the packaging material.
Claims20
A compostable laminated packaging material comprising:
- a sealant layer compostable under uncontrolled composting conditions, and
- a barrier layer compostable under uncontrolled composting conditions, said barrier layer bonded to said sealant layer with a water-based dry bond adhesive, said adhesive including a cross-linking coreactant,
- wherein the laminated packaging material is compostable under controlled or uncontrolled conditions.
A laminated packaging material biodegradable under uncontrolled composting conditions comprising:
- a compostable sealant layer comprising bioplastic film compostable under uncontrolled composting conditions, said sealant layer having a thickness of approximately two mils, and
- a compostable barrier layer comprising a cellulose film compostable under uncontrolled composting conditions, said cellulose film having
- an oxygen transfer rate no greater than 0.06 cc/100 in2 per day at 75° F. and 0% RH, and
- a water vapor transfer rate no greater than 2.9 g/100 in2 per day at 77° F. and 75% RH,
- said barrier layer bonded to said sealant layer with a water-based dry bond adhesive, said adhesive including a hydroxyl or an aziridine cross-linking coreactant.
A method for making a compostable laminated packaging material comprising:
- coating a barrier layer with a water-based dry bond adhesive at a coat rate of between approximately 2.5 and 3.5 lbs per ream, said barrier layer compostable under uncontrolled composting conditions, said adhesive including a hydroxyl or aziridine cross-linking coreactant,
- passing said adhesive-coated barrier layer across a hot drum heated to a temperature of between approximately 220° F. and 240° F.,
- air drying said adhesive until tacky, and
- passing said adhesive-coated barrier layer and a sealant layer between a nip roller and a cooperating impedance roller to form a laminated material.
A method for making a compostable laminated packaging material comprising:
- coating a barrier layer with a water-based dry bond adhesive at a coat rate of between approximately 2.5 and 3.5 lbs per ream, said barrier layer comprising a bioplastic film having a thickness of approximately two mils, an oxygen transfer rate no greater than 0.06 cc/100 in2 per day at 75° F. and 0% RH, and a water vapor transfer rate no greater than 2.9 g/100 in2 per day at 77° F. and 75% RH, said barrier layer compostable under uncontrolled, composting conditions, said adhesive including a hydroxyl or an aziridine cross-linking coreactant,
- passing said adhesive-coated barrier layer across a hot drum heated to a temperature of between approximately 220° F. and 240° F.,
- air drying said adhesive until tacky,
- passing said adhesive-coated barrier layer and a sealant layer between a nip roller and a cooperating impedance roller at a pressure of between approximately 15 and 20 PSI to form a laminated material, said nip roller having a temperature of approximately 180° F., said sealant layer comprises a bioplastic film having a thickness of approximately 2 mils, said sealant layer compostable under uncontrolled composting conditions, and
- curing said laminated material for between approximately 48 to 72 hours at between approximately 70° F. and 80° F.,
- wherein said laminated material is compostable under controlled or uncontrolled conditions.
Dependencies are inferred from the claim text.