Paper aimed at forming a u-straw
The invention relates to drinking U-straws and more particularly to a paper for manufacturing drinking U-straws, which is environmental friendly, bio-degradable and is able to be formed in the shape of a bent straw with an accordion-like structure at the bend. The paper has high water resistance as well as high strength and elongation properties compatible with the intended use. In particular, the paper for forming a U-straw includes: •between 10 and 50 dry wt % of first fibers having a length of between 1.4 mm and 2.5 mm; •between 40 and 80 dry wt % of second fibers having a length of between 0.3 mm and 0.8 mm; and •between 1 and 6 dry wt % of a sizing agent.
1 . A U-straw characterized in that it is made from at least one layer of a paper, wherein the paper comprises:
between 10 and 50 dry wt % of first fibers having a length of between 1.4 mm and 2.5 mm;
between 40 and 80 dry wt % of second fibers having a length of between 0.3 mm and 0.8 mm;
between 1 and 6 dry wt % of a sizing agent; and
starch, wherein the starch is present in the paper in an amount of at most 1 dry wt %;
said paper having:
an elongation in the Cross Direction of between 4 and 8%.
2 . The U-straw according to claim 1 , characterized in that the U-straw is made of three layers of the paper, said layers forming a laminate and being adhered together by a food-compatible glue.
3 . The U-straw according to claim 2 , characterized in that the U-straw is made of an outer layer having a grammage of 60 gsm, an inner layer having a grammage of 60 gsm and an intermediate layer having a grammage of 120 gsm, said intermediate layer being disposed between the inner and the outer layers.
4 . The U-straw according to claim 3 , characterized in that the paper forming the outer layer has a porosity comprised between 360 ml/min and 800 ml/min.
5 . The U-straw according to claim 3 , characterized in that the inner layer has a porosity comprised between 360 ml/min and 800 ml/min.
6 . The U-straw according to claim 1 , characterized in that it is made of two layers, respectively an inner layer and an outer layer of the paper.
7 . The U-straw according to claim 6 , characterized in that the U-straw is made of an outer layer having a grammage of 80 gsm and an inner layer having a grammage of 140 gsm.
8 . The U-straw according to claim 6 , characterized in that the outer layer has a porosity comprised between 360 ml/min and 800 ml/min.
9 . The U-straw according to claim 1 , wherein the first fibers are softwood fibers, and the second fibers are hardwood fibers.
10 . The U-straw according to claim 9 , wherein the softwood fibers comprise Northern Bleached Softwood Kraft or Southern Bleached Softwood Kraft pulp.
11 . The U-straw according to claim 9 , wherein the hardwood fibers comprise Eucalyptus , Northern Bleached Hardwood Kraft, or Southern Bleached Hardwood Kraft pulp.