Reinforced paper for packaging of medical devices
There is provided a paper for packaging of medical devices comprising 5-25 wt. % (dry) synthetic fibres comprising polyester and 2.0-12.0 wt. % (dry) of a latex binder or 1.0-5.0 wt. % (dry) of a starch binder, wherein the length of the synthetic fibres is 8-14 mm and the thickness of the synthetic fibres is 5.5-9.0 dtex and wherein the paper has a grammage according to ISO 536:2012 of 70-110 g/m 2 .
1. A paper for packaging of medical devices comprising 5-25 wt. % (dry) synthetic fibers comprising polyester and 3.0-10.0 wt. % (dry) of a synthetic latex binder or 1.0-5.0 wt. % (dry) of a starch binder, wherein the length of the synthetic fibers is 8-14 mm and the thickness of the synthetic fibers is 5.5-9.0 dtex and wherein the paper has a grammage according to ISO 536:2012 of 70-110 g/m 2 ;
wherein the Bendtsen Porosity is measured according to ISO 5636-3:2013 is at least 400 ml/min.
2. The paper according to claim 1 , which is a kraft paper.
3. The paper according to claim 1 , which has a grammage according to ISO 536:2012 of 75-105 g/m 2 .
4. The paper according to claim 1 , wherein the Bendtsen Porosity is at least 400 ml/min.
5. The paper according to claim 1 , wherein the amount of synthetic fibers is 8-15 wt. % (dry).
6. The paper according to claim 1 , wherein the length of the synthetic fibers is 10-14 mm.
7. The paper according to claim 1 , wherein the length of the synthetic fibers is 10-12 mm.
8. The paper according to claim 1 , wherein a sheath portion of the synthetic fibers comprises polyester.
9. The paper according to claim 1 , wherein the synthetic fibers are composed of polyester only.
10. The paper according to claim 1 , wherein the amount of synthetic latex binder is 3.0-8.0 wt. % (dry).
11. The paper according to claim 1 , wherein the geometric bending resistance index is 60-160 Nm 6 /kg 3 , which bending resistance is measured according to ISO 2493-1:2010 using a bending length of 10 mm and a bending angle of 15°.
12. The paper according to claim 1 wherein the Tensile Energy Absorption (TEA) index according to ISO 1924-3:2005 is at least 1.5 J/g in the machine direction (MD) and at least 2.4 J/g in the cross direction (CD).
13. The paper according to claim 1 , wherein the tear index according to ISO 1974:2012 is at least 17.0 mNm 2 /g in the machine direction (MD) and at least 21.0 mNm 2 /g in the cross direction.
14. A method of producing a paper according to claim 1 in a paper machine, comprising the steps of adding the synthetic fibers comprising polyester to a pulp upstream a headbox of the paper machine, forming a paper web from the pulp and impregnating the paper web with the latex or starch binder.
15. The method of claim 14 , wherein the impregnation is carried out using a size press, which forms part of the paper machine.