Pulp mixture
There is provided a use of a pulp mixture for forming a container in a mould, which pulp mixture comprises: 65-90%, such as 70-84%, by dry weight of a first pulp having a Schopper-Riegler (SR) number of below 48, preferably below 40, more preferably below 30; and 10-35%, such as 16-30%, by dry weight of a second pulp having a Schopper-Riegler (SR) number of 60-90, preferably 70-90, more preferably 77-90. A pulp mixture and a method of producing a pulp mixture are also provided.
1 . A molded container that comprises a pulp mixture, the pulp mixture including:
65-90% by dry weight of a first pulp, which is a resuspended softwood market pulp having an average length-weighted fiber length of above 1.75 mm and having a Schopper-Riegler (SR) number according to ISO 5267-1 of below 48; and
10-35% by dry weight of a second pulp having an average length-weighted fiber length that is less than the average length of the first pulp, and a Schopper-Riegler (SR) number according to ISO 5267-1 of 60-90.
2 . The container of claim 1 , wherein the second pulp is a refined resuspended market pulp.
3 . The container of claim 2 , wherein the first pulp comprises at least 75% chemical softwood pulp based of the dry weight of the first pulp.
4 . The container of claim 2 , wherein the first pulp comprises at least 90% chemical softwood pulp based of the dry weight of the first pulp.
5 . The container of claim 2 , wherein the first pulp comprises at least 50% chemical softwood pulp-based of the dry weight of the first pulp.
6 . The container of claim 1 , wherein the length-weighted proportion of fibers having a length below 0.2 mm in the first pulp is below 5.0%, when measured according to TAPPI T271.
7 . The container of claim 1 , wherein the length-weighted proportion of fibers having a length below 0.2 mm in the second pulp is 5.0-9.0%, when measured according to TAPPI T271.
8 . The container of claim 1 , wherein the amount of filler in the pulp mixture is below 5% by dry weight.
9 . The container of claim 1 , wherein the container is bottle-shaped.
10 . The container of claim 1 , wherein the container is a pod part, capsule part, tray, bowl or cup.
11 . The container of claim 1 , comprising 70-84% by dry weight of the first pulp.
12 . The container of claim 1 , wherein the Schopper-Riegler (SR) number according to ISO 5267-1 of the first pulp is below 40.
13 . The container of claim 1 , wherein the Schopper-Riegler (SR) number according to ISO 5267-1 of the first pulp is below 30.
14 . The container of claim 1 , comprising 16-30% by dry weight of the second pulp.
15 . The container of claim 1 , wherein the Schopper-Riegler (SR) number according to ISO 5267-1 of the second pulp is 70-90.
16 . The container of claim 1 , wherein the Schopper-Riegler (SR) number according to ISO 5267-1 of the second pulp is 77-90.
17 . A method comprising the steps of:
a) providing a first pulp, which is a resuspended softwood market pulp having an average length-weighted fiber length of above 1.75 mm having a Schopper-Riegler (SR) number according to ISO 5267-1 of below 48;
b) subjecting a first part of the first pulp and to low consistency (LC) refining to obtain a second pulp having an average length-weighted fiber length that is less than the average length of the first pulp, and having a Schopper-Riegler (SR) number according to ISO 5267-1 of 60-90;
c) mixing a second part of the first pulp with the second pulp in such proportions that a pulp mixture comprising 65-90% by dry weight of the first pulp and 10-35%, by dry weight of the second pulp is obtained.
18 . The method of claim 17 , wherein the energy supply of the LC refining is 150-500 kWh/ton dry pulp.
19 . The method of claim 17 , further comprising the step of:
d) forming a container from the pulp mixture in a mold.
20 . The method of claim 17 , wherein step d) comprises a substep of dewatering the pulp mixture in the mold.
21 . The method of claim 17 , further comprising the step of:
e) applying a barrier layer to the container.