Venting liners

Claim 2

A venting liner for a closure comprising a disc-shaped member, said disc-shaped member being defined by at least two plies of polymeric or copolymeric plastic material, a first of said plies being impermeable, the plastic material of a second of said plies being deformable when subject to a compressive force, said second ply including a plurality of indentations, and first areas of said second ply between said indentations being generally uncompressed relative to second areas of said second ply generally at said indentations or less compressed relative to second areas of said second ply generally at said indentations.

Claim 3

The venting liner as defined in claim 1 wherein the material of said second ply is foamed.

Claim 4

The venting liner as defined in claim 2 wherein said second areas are of a predetermined density, and said first areas are of a lesser density than said predetermined density.

Claim 5

The venting liner as defined in claim 3 wherein said at least two plies are a simultaneously extruded and bonded laminate.

Claim 6

The venting liner as defined in claim 2 wherein said at least two plies are a simultaneously extruded and bonded laminate.

Claim 7

The venting liner as defined in claim 2 wherein said indentations are in general parallel relationship to each other.

Claim 8

The venting liner as defined in claim 1 wherein the material of said second ply is foamed, said second areas are of a predetermined density, and said first areas are of a lesser density than said predetermined density.

Claim 9

The venting liner as defined in claim 1 wherein said at least two plies are a simultaneously extruded and bonded laminate.

Claim 10

The venting liner as defined in claim 1 wherein said indentations are in general parallel relationship to each other.

Claim 11

The venting liner as defined in claim 1 wherein said indentations are generally V-shaped in transverse cross-section.

Claim 12

A combined container and closure comprising a container body including an opening circumscribed by a circumferential sealing lip, a closure including an end panel and a peripheral skirt, means removably securing said closure to said container body in closed relationship to said opening, a venting liner disposed between said end panel and said sealing lip, said venting liner comprising a disc-shaped member, said disc-shaped member being defined by at least two plies of polymeric or copolymeric plastic material, the plastic material of a first of said plies being impermeable, the plastic material of a second of said plies being deformable when subject to a compressive force, said second ply including a plurality of indentations opening in a direction away from said second ply, first areas of said second ply between said indentations being generally uncompressed relative to second areas of said second ply generally at said indentations or less compressed relative to second areas of said second ply generally at said indentations, said indentations open in a direction toward said end panel, said second ply being in hermetic sealing engagement with said sealing lip over the entire circumferential sealing area of the latter, said closure being secured to said container body under moderate axial load whereby portions of said indentations with said circumferential sealing area are open and upon excessive internal pressure within said container body said second ply of at least one of said second areas within said circumferential sealing area raises to break the hermetic seal and permit venting to atmosphere of the internal pressure.

Claim 13

A combined container and closure comprising a container body including an opening circumscribed by a circumferential sealing lip, a closure including an end panel and a peripheral skirt, means removably securing said closure to said container body in closed relationship to said opening, a venting liner disposed between said end panel and said sealing lip, said venting liner comprising a disc-shaped member, said disc-shaped member being defined by at least two plies of polymeric or copolymeric plastic material, the plastic material of a first of said plies being impermeable, the plastic material of a second of said plies being deformable when subject to a compressive force, said second ply including a plurality of indentations opening in a direction away from said second ply, first areas of said second ply between said indentations being generally uncompressed relative to second areas of said second ply generally at said indentations or less compressed relative to second areas of said second ply generally at said indentations, said indentations open in a direction toward said end panel, said second ply being in hermetic sealing engagement with said sealing lip over the entire circumferential sealing area of the latter, said closure being secured to said container body under moderate axial load whereby portions of said indentations with said circumferential sealing area are open and upon excessive internal pressure within said container body said second ply of at least one of said second areas within said circumferential sealing area raises to break the hermetic seal and permit venting to atmosphere of the internal pressure.

Claim 14

The container and closure combination as defined in claim 11 wherein the material of said second ply is foamed.

Claim 15

The container and closure combination as defined in claim 12 wherein said second areas are of a predetermined density, and said first areas are of a lesser density than said predetermined density.

Claim 16

The container and closure combination as defined in claim 13 wherein said at least two plies are a simultaneously extruded and bonded laminate.

Claim 17

The container and closure combination as defined in claim 12 wherein said at least two plies are a simultaneously extruded and bonded laminate.

Claim 18

The container and closure combination as defined in claim 12 wherein said indentations are in general parallel relationship to each other.

Claim 19

The container and closure combination as defined in claim 11 wherein the material of said second ply is foamed, said second areas are of a predetermined density, and said first areas are of a lesser density than said predetermined density.

Claim 20

The container and closure combination as defined in claim 11 wherein said at least two plies are a simultaneously extruded and bonded laminate.

Claim 21

The container and closure combination as defined in claim 11 wherein said indentations are in general parallel relationship to each other.

Claim 22

The container and closure combination as defined in claim 11 wherein said indentations are generally V-shaped in transverse cross-section.

Claim 23

A combined container and closure comprising a container body including an opening circumscribed by a circumferential sealing lip, a closure including an end panel and a peripheral skirt, means removably securing said closure to said container body in closed relationship to said opening, a venting liner disposed between said end panel and said sealing lip, said venting liner comprising a disc-shaped member, said disc-shaped member being defined by at least two plies of polymeric or copolymeric plastic material, the plastic material of a first of said plies being impermeable, the plastic material of a second of said plies being deformable when subject to a compressive force, said second ply including a plurality of indentations opening in a direction away from said second ply, first areas of said second ply between said indentations being generally uncompressed relative to second areas of said second ply generally at said indentations or less compressed relative to second areas of said second ply generally at said indentations, said indentations open in a direction toward said end panel, said second ply being in hermetic sealing engagement with said sealing lip over the entire circumferential sealing area of the latter, said closure being secured to said container body under high axial load whereby portions of said indentations within said circumferential sealing areas are closed and upon excessive internal pressure within said container body said second ply at at least one of said first areas within said circumferential sealing area raises to break the hermetic seal and permit venting to atmosphere of the internal pressure.

Claim 24

A combined container and closure comprising a container body including an opening circumscribed by a circumferential sealing lip, a closure including an end panel and a peripheral skirt, means removably securing said closure to said container body in closed relationship to said opening, a venting liner disposed between said end panel and said sealing lip, said venting liner comprising a disc-shaped member, said disc-shaped member being defined by at least two plies of polymeric or copolymeric plastic material, the plastic material of a first of said plies being impermeable, the plastic material of a second of said plies being deformable when subject to a compressive force, said second ply including a plurality of indentations opening in a direction away from said second ply, first areas of said second ply between said indentations being generally uncompressed relative to second areas of said second ply generally at said indentations or less compressed relative to second areas of said second ply generally at said indentations, said indentations open in a direction toward said end panel, said second ply being in hermetic sealing engagement with said sealing lip over the entire circumferential sealing area of the latter, said closure being secured to said container body under high axial load whereby portions of said indentations within said circumferential sealing areas are closed and upon excessive internal pressure within said container body said second ply at at least one of said first areas within said circumferential sealing area raises to break the hermetic seal and permit venting to atmosphere of the internal pressure.

Claim 25

The container and closure combination as defined in claim 21 wherein the material of said second ply is foamed.

Claim 26

The container and closure combination as defined in claim 22 wherein said second areas are of a predetermined density, and said first areas are of a lesser density than said predetermined density.

Claim 27

The container and closure combination as defined in claim 23 wherein said at least two plies are a simultaneously extruded and bonded laminate.

Claim 28

The container and closure combination as defined in claim 22 wherein said at least two plies are a simultaneously extruded and bonded laminate.

Claim 29

The container and closure combination as defined in claim 22 wherein said indentations are in general parallel relationship to each other.

Claim 30

The container and closure combination as defined in claim 21 wherein said second areas are of a predetermined density, and said first areas are of a lesser density than said predetermined density.

Claim 31

The container and closure combination as defined in claim 21 wherein said at least two plies are a simultaneously extruded and bonded laminate.

Claim 32

The container and closure combination as defined in claim 21 wherein said indentations are in general parallel relationship to each other.

Claim 33

The container and closure combination as defined in claim 21 wherein said indentations are generally V-shaped in transverse cross-section.

Claim 34

A venting liner for a closure comprising a disc-shaped member formed of foamed polymeric or copolymeric plastic material, said member being deformable when subject to a compressive force, a plurality of indentations in said member, and first areas of said member between said indentations being generally uncompressed relative to second areas of said member at said indentations or less compressed relative to second areas of said member at said indentations.

Claim 35

A venting liner for a closure comprising a disc-shaped member formed of foamed polymeric or copolymeric plastic material, said member being deformable when subject to a compressive force, a plurality of indentations in said member, and first areas of said member between said indentations being generally uncompressed relative to second areas of said member at said indentations or less compressed relative to second areas of said member at said indentations.

Claim 36

The venting liner as defined in claim 31 wherein said material is denser in said second areas as compared to said first areas.