BALLISTIC-RESISTANT ARTICLES COMPRISING TAPES
Ballistic-resistant moulded article comprising a compressed stack of sheets comprising tapes of a reinforcing material, characterised in that at least one sheet comprises woven tapes as weft and as warp, at least some of the tapes having a width of at least 10 mm. A method for manufacturing the ballistic-resistant moulded article is also claimed.
1 . A ballistic-resistant molded article, comprising:
a compressed stack of sheets comprising a plurality of tapes comprised of a reinforcing material,
wherein at least one sheet of the compressed stack of sheets comprises a plurality of woven tapes as a weft and as a warp, and
wherein at least one tape of the plurality of tapes has a width of at least 10 mm.
2 . The ballistic-resistant molded article according to claim 1 , wherein the plurality of woven tapes are high-molecular weight polyethylene tapes.
3 . The ballistic-resistant molded article according to claim 1 , wherein the at least one tape of the plurality of tapes has a width of at least 20 .
4 . The ballistic-resistant molded article according to claim 1 , wherein a ratio between a width of the plurality of woven tapes in a weft direction and a width of the plurality of woven tapes in a warp direction is between 5:1 and 1:5.
5 . The ballistic-resistant molded article according to claim 1 , wherein the ballistic-resistant molded article does not comprise a matrix material.
6 . The ballistic-resistant molded article according to claim 1 , wherein the compressed stack of sheets further comprises a matrix material in an amount of from 0.2-30 wt. %.
7 . The ballistic-resistant molded article according to claim 1 , wherein the at least one sheet is substantially free from matrix material and the matrix material is present between the compressed stack of sheets.
8 . The ballistic-resistant molded article according to claim 1 , wherein a plurality of sheets comprising the plurality of woven tapes as weft and as warp are stacked on top of each other, the stacking being carried out in such a manner that tape intersections of one sheet of the plurality of sheets are not stacked on top of tape intersections of adjacent sheets of the compressed stack of sheets.
9 . The ballistic-resistant molded article according to claim 1 , wherein the plurality of woven tapes are polyethylene tapes having a weight average molecular weight (Mw) of at least 100,000 gram/mole, and a Mw/number average molecular weight (Mw) ratio of less than 6.
10 . The ballistic-resistant molded article according to claim 9 , wherein the polyethylene tapes have a Mw/Mn ratio of less than 5.
11 . The ballistic-resistant molded article according to claim 9 , wherein the polyethylene tapes have a 200/110 uniplanar orientation parameter of at least 3.
12 . The ballistic-resistant molded according to claim 9 , wherein the polyethylene tapes have a tensile strength of at least 2.0 GPa.
13 . The ballistic-resistant molded according to claim 9 , wherein the polyethylene tapes have a tensile energy to break of at least 30 J/g.
14 . A consolidated sheet package comprising the ballistic-resistant molded article of claim 1 , wherein the consolidated sheet package comprises 2-16 sheets.
15 . A method for manufacturing a ballistic-resistant molded article, the method comprising:
providing a plurality of sheets, each sheet of the plurality of sheets comprising a plurality of tapes comprised of a reinforcing material, wherein at least one sheet of the plurality of sheets comprises a plurality of woven tapes as a weft and as a warp,
stacking the plurality of sheets, and
compressing the stacked sheets under a pressure of at least 0.5 MPa.
16 . The ballistic-resistant molded article according to claim 1 , wherein the at least one tape of the plurality of tapes has a width of at least 40 mm
17 . The ballistic-resistant molded article according to claim 1 , wherein a ratio between a width of the plurality of woven tapes in a weft direction and a width of the plurality of woven tapes in a warp direction is between 2:1 and 1:2.
18 . The ballistic-resistant molded article according to claim 1 , wherein the compressed stack of sheets further comprises a matrix material in an amount of from 0.2-12 wt. %.