Monofilament or multifilament HPPE yarns
Treated HPPE yarns include elemental metal which forms a layer that adheres to the surface of the HPPE yarn and covers at least partly the surface of the HPPE yarn. The elemental metal is deposited onto the outer surface of a HPPE yarn via sputtering, preferably plasma sputtering. Articles comprising the treated HPPE yarn, a device comprising the treated HPPE yarn or the article as well as processes for preparing the treated HPPE yarn or treated HPPE yarn structure or treated HPPE yarn configuration and use of the treated HPPE yarn or an article or a device comprising the treated HPPE yarn for automotive applications, marine applications, aerospace applications, medical applications, defense applications, sports/recreational applications, architectural applications, clothing applications, bottling applications, machinery applications are also disclosed.
1. A treated high performance polyethylene (HPPE) yarn comprising an elemental metal deposited onto an outer surface of the yarn via plasma sputtering, wherein
the elemental metal forms a continuous layer that partly covers the surface of the yarn so as to present bare parts and localized layer surface defects, and wherein
the continuous layer of elemental metal has a thickness of at least 5 nm and at most 550 nm that adheres to an outer surface of the HPPE yarn and covers at least 75% of the outer surface of the HPPE yarn, and wherein
the elemental metal is present in an amount of at least 1.6% w/w and at most 95% w/w of the total weight of the treated HPPE yarn, and wherein
the treated HPPE yarn has a tenacity of 15 cN/dtex or more which is comparable to within +/−15% of the tenacity of an untreated HPPE yarn.
2. The treated HPPE yarn according to claim 1 , wherein the elemental metal is selected from the group consisting of elemental metals with atomic number Z equal to 13 (Al°), 22 (Ti°), 24 (Cr°), 25 (Mn°), 26 (Fe°), 28 (Ni°), 29 (Cu°), 30 (Zn°), 40 (Zr°), 46 (Pd°), 47 (Ag°), 78 (Pt°), 79 (Au°) and mixtures thereof.
3. The treated HPPE yarn according to claim 1 , wherein the elemental metal is silver (Ag°).
4. An article comprising the treated HPPE yarn as defined in claim 1 .
5. A device comprising the article as defined in claim 4 .
6. A device comprising the treated HPPE yarn as defined in claim 1 .
7. The device according to claim 6 , wherein the device is a device for an application selected from the group consisting of automotive applications, marine applications, aerospace applications, medical applications, defense applications, sports/recreational applications, architectural applications, clothing applications, bottling applications and machinery applications.
8. The device according to claim 6 , wherein the treated HPPE yarn is present in an amount such that the treated HPPE yarn exhibits at least one property selected from the group consisting of electrical conductivity, antimicrobial properties, radio opacity, anti-thrombogenic properties and anti-fouling properties.
9. A process for making a treated high performance polyethylene (HPPE) yarn having a tenacity of 15 cN/dtex of more which is comparable to within +/−15% of the tenacity of an untreated HPPE yarn, the method comprising the steps of:
depositing a layer of elemental metal to a surface of a HPPE yarn via plasma sputtering using the HPPE yarn as a substrate and an elemental metal or metal alloy as target material to thereby obtain a treated HPPE yarn such that the deposited layer of elemental metal partly covers the surface of the yarn so as to present bare parts and localized layer surface defects; and
optionally converting the treated HPPE yarn into a yarn structure selected from the group consisting of a braid structure, a textile structure, a woven structure, a non-woven structure and a knitted structure.
10. A method for indicating retirement or failure detection of a treated high performance polyethylene (HPPE) yarn, the method comprising:
(i) providing the treated HPPE yarn as defined in claim 1 ;
(ii) measuring electrical conductivity or electrical resistivity between at least two longitudinally distant points on the treated HPPE yarn;
(iii) comparing electrical conductivity or electrical resistivity measurements acquired at different times;
(iv) detecting a failure of the treated HPPE yarn if a change in electrical conductivity is equal or lower than the electrical conductivity recommended for the treated HPPE yarn.