System and Method for Manufacturing an Improved Film for Medical Supply Packaging
AssigneeAdvanced Films, LLC
InventorsEdward A. Davies, Bradley Abeson
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Abstract
Systems and methods for generating a film suitable for medical packaging are provided. The film is generated by blown film co-extrusion to form a multi-layer film which has a heat resistant layer, a barrier layer and a heat seal layer. The barrier layer includes a high barrier resin and a branched co-polymer. The high barrier resin has a density of at least 0.963 g/cm3. The barrier layer includes between 25% and 85% high barrier resin. In some embodiments, an additional laminate layer may be affixed to the heat resistant layer of the multi-layer film. The final film is between 3.0 and 3.8 mils in thickness, and has a moisture vapor transmission rate of less than 0.08.
Claims19
A film comprising:
- a heat seal layer comprising approximately 30% medium density polyethylene and approximately 70% high density polyethylene;
- a heat resistant layer comprising approximately 70% high density polyethylene and approximately 30% linear low density polyethylene;
- a barrier layer between the heat seal layer and the heat resistant layer comprising a blend of 20% linear low density polyethylene and 80% of a second polymer having a relatively high density of at least 0.966 g/cc, referred to as a high barrier resin, wherein the heat seal layer, the barrier layer and heat resistant layer are coextruded at a thickness approximately 3.5 mils at a ratio of approximately 20-60-20 respectively, and have a calculated moisture vapor transmission rate of approximately 0.059 g/100 in2/24 hours/atm;
- a primary substrate with a thickness of approximately 0.48 mils adhered to the heat resistant layer with an adhesive approximately 0.01 mils thick to make a final film, wherein the primary substrate is polyethylene terephthalate, and wherein the final film a thickness of the final film is approximately 4.1 mils;
- and
- wherein the final film has a thermal process window that is greater than ten degrees Celsius.
A heat sealed bag comprising:
- a film which comprises a heat seal layer comprising approximately 30% medium density polyethylene and approximately 70% high density polyethylene, a heat resistant layer comprising approximately 70% high density polyethylene and approximately 30% linear low density polyethylene, a barrier layer between the heat seal layer and the heat resistant layer comprising a blend of 20% linear low density polyethylene and 80% of a second polymer having a relatively high density of at least 0.966 g/cc, referred to as a high barrier resin, wherein the heat seal layer, the barrier layer and heat resistant layer are coextruded at a thickness approximately 3.5 mils at a ratio of approximately 20-60-20 respectively, and have a calculated moisture vapor transmission rate of approximately 0.059 g/100 in2/24 hours/atm, a primary substrate with a thickness of approximately 0.48 mils adhered to the heat resistant layer with an adhesive approximately 0.01 mils thick to make a final film, wherein the primary substrate is polyethylene terephthalate, and wherein the final film a thickness of the final film is approximately 4.1 mils, and wherein the final film has a thermal process window that is greater than-ten degrees Celsius;
- and
- at least one heat seal between the film forming an interior space.
Dependencies are inferred from the claim text.