Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
Smoke-filter rod which comprises a body of rod form having as at least major constituent a thermoplastics smoke-filtration material of the group consisting of cellulose acetate and polypropylene and wrapped in a plugwrap separate from said body but attached thereto by a bonding agent, the plugwrap comprising at least 50% by weight of fibres or filaments of a material of the said group of, respectively, substantially the same chemical identity as said major constituent of the filtration material and which has a permeability for air of not less than 10,000 Coresta units.
Claim 2
Dependent Claim
92 words
Smoke-filter rod which comprises a body of rod form having as at least major constituent a thermoplastics smoke-filtration material of the group consisting of cellulose acetate and polypropylene and wrapped in a plugwrap separate from said body but attached thereto by a bonding agent, the plugwrap comprising at least 50% by weight of fibres or filaments of a material of the said group of, respectively, substantially the same chemical identity as said major constituent of the filtration material and which has a permeability for air of not less than 10,000 Coresta units.
Claim 3
Dependent Claim
35 words
Filter rod according to claim 1, wherein said plugwrap is bonded to said body by an agent which is a bonding agent for the material of said fibres or filaments and for said filtration material.
Claim 4
Dependent Claim
20 words
Filter rod according to claim 1 or 2, wherein the smoke filtration material is of a fibrous or filamentary nature.
Claim 5
Dependent Claim
34 words
Filter rod according to claim 1 or 2, wherein the rodform body has cellulose acetate tow as at least said major constituent, and said fibres or filaments of the plugwrap are of cellulose acetate.
Claim 6
Dependent Claim
12 words
Filter rod according to claim 4, wherein the bonding agent is triacetin.
Claim 7
Dependent Claim
32 words
Filter rod according to claim 1 or 2, wherein the rodform body has polypropylene tow as at least said major constituent and said fibres or filaments of the plugwrap are of polypropylene.
Claim 8
Dependent Claim
20 words
Filter rod according to claims 1 or 2, wherein the plugwrap comprises at least 90% of said fibres or filaments.
Claim 9
Dependent Claim
21 words
A portion of filter rod according to claim 1 or 2, wherein said portion has been subjected to a hot-shaping process.
Claim 10
Independent Claim
116 words
A method of making smoke-filter rod, wherein a continuous tow or web having as at least major constituent a thermoplastics filtration material of the group consisting of cellulose acetate and polypropylene is impregnated with a bonding agent for said material and is gathered into a rod-form body and wrapped in a continuous fibrous or filamentary plugwrap separate from said body but attached thereto by a bonding agent, the plugwrap having a permeability for air of not less than 10,000 Coresta units, said plugwrap comprising at least 50% by weight of fibres or filaments of a material of the said group of, respectively substantially the same chemical identity as the said major constituent of the filtration material.
Claim 11
Independent Claim
116 words
A method of making smoke-filter rod, wherein a continuous tow or web having as at least major constituent a thermoplastics filtration material of the group consisting of cellulose acetate and polypropylene is impregnated with a bonding agent for said material and is gathered into a rod-form body and wrapped in a continuous fibrous or filamentary plugwrap separate from said body but attached thereto by a bonding agent, the plugwrap having a permeability for air of not less than 10,000 Coresta units, said plugwrap comprising at least 50% by weight of fibres or filaments of a material of the said group of, respectively substantially the same chemical identity as the said major constituent of the filtration material.