Packaging structure with optimized surface energy

A method of making a recyclable laminate, the method comprising:

• providing a first structure, wherein the first structure defines an initial surface energy of 32 dyne or less;
• providing a second structure, wherein the second structure defines a surface energy of 42 dyne or more;
• applying a surface treatment to the first structure, wherein the surface treatment increases the initial surface energy to a second surface energy, wherein the second surface energy is between 32-42 dyne;
• applying an adhesive layer to at least one of the first structure or the second structure;
• and
• laminating the first structure and the second structure.

A recyclable packaging structure, the packaging structure comprising:

• a first structure having an inner surface and an outer surface;
• a second structure having an inner surface and an outer surface, wherein the outer surface of the second structure is adhesively bonded to the inner surface of the first structure by an adhesive layer to form a laminate, the packaging structure further comprising a repeatedly openable and closeable flexible structure which comprises, prior to initial opening:
• a first score line in the laminate defining an outer layer opening portion and a second score line in the laminate defining an inner layer opening portion wherein the outer layer opening portion is larger in area than the inner layer opening portion and extends beyond a periphery of the inner layer opening portion;
• the inner layer upper surface comprising a first marginal region surrounding the second score line;
• a non-detachable flap, the flap comprising the outer layer opening portion and the inner layer opening portion;
• the outer layer lower surface comprising a second marginal region comprising at least a portion of a periphery of the outer layer opening portion lower surface;
• and
• the first marginal region being releasably and resealably adhered to the second marginal region, wherein at least one of the first structure or the second structure comprises polyethylene, wherein the surface energy of the polyethylene, in the first or second marginal region, is between 32 and 42 dyne, and wherein the surface area within the second score line and outside of the first score line is at least 42 dyne.

A method of making a recyclable laminate, the method comprising:

• providing a first polyethylene film, wherein the polyethylene film defines an initial surface energy of 32 dyne or less;
• providing a second polyethylene film;
• pattern applying a first surface treatment to the first polyethylene film, wherein the first surface treatment increases the initial surface energy to a second surface energy in a reseal region, wherein the second surface energy is between 32-42 dyne;
• pattern applying a second surface treatment to the first polyethylene film, wherein the second surface treatment increases the initial surface energy to a third surface energy in an area which is not the reseal region, wherein the third surface energy is at least 42 dyne;
• applying an adhesive layer to at least one of the first structure or the second structure;
• and
• laminating the first structure and the second structure.