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title: "7.1.4\tSpinning preparation"
canonical: "https://wiki.groenkennisnet.nl/space/HNPE/295011394/7.1.4%09Spinning%20preparation"
format: markdown
---
Prior to wet spinning, a few more production steps take place (Scheme below). After selecting the batches of hackled sliver, a plan is made for mixing, drafting and doubling the slivers (‘mixing plan’). Then, hackled sliver from selected bales are drafted on a drawing frame and reassembled into a new sliver (Figure below). This drafting and doubling process takes place at least 4 times and aims to obtain a more homogeneous sliver with further refined fibres. The sliver is lightly twisted using a roving frame (Figure below) into roving that is wound onto a rove bobbin after which the fibre is suitable for further refining and wet spinning (§[7.1.5](https://wiki-groenkennisnet.atlassian.net/wiki/spaces/HNPE/pages/295011458)).

![image](media://aab2f8b1-9cd5-434f-adaa-a21cdb620f0f)


If necessary, the wick or rove bobbin can be demineralised, alkaline boiled and/or bleached before wet spinning.

Demineralisation contributes to:

- Removal of iron which can lead to holes in the fibre and thus in textiles due to rusting and possible washing out during washes.
- Removal of other metals to avoid possible negative effects in subsequent processes (e.g., dyeing).
- Higher degree of whiteness after peroxide bleaching.
- Lower hardness of the fibres, yarns and ultimately the fabric.

Demineralisation takes place before or after alkaline boiling.


Alkaline boiling contributes to:

- Removal of secondary substances (hemicellulose, pectin, lignin, natural fats and waxes).
- Spinnability due to smoother fibres as a result of removing lignin and pectin.


Bleaching contributes to:

- Removal of natural dyes, or coloured impurities
- Increasing hydrophilicity

![image](media://0c6ca946-6793-4f1e-97a6-79262db49119)

> ℹ️ <u>Companies pretreating hemp for spinning</u>
> ℹ️ 
> ℹ️ - Fibres: Safilin (France), [https://www.safilin.fr](https://www.safilin.fr)
> ℹ️ - Fibres: Schrurs (Ieper, Belgium), Serge Schrurs, [http://www.schrurs.be/index.php?lang=NL](http://www.schrurs.be/index.php?lang=NL)
> ℹ️ - Fibres: Van Riel (Temse, Belgium), Alain Van Riel, [https://www.vanrieltemse.be/en](https://www.vanrieltemse.be/en)
> ℹ️ - Bobbins: Masureel (Wevelgem, Belgium), [https://www.masureel-group.com](https://www.masureel-group.com)