Fleece for sustained release of an active substance
AssigneeReifenhaeuser GmbH & Co. KG Maschinenfabrik
InventorClaudio Cinquemani
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Abstract
The invention relates to the use of a fleece composed of plastic filaments, in particular made of a thermoplastic, as a sustained-released system or as a storage system for at least one active substance, in particular for at least one active liquid. The filaments are spun using a spinneret, and the plastic material of the filaments is foamed so that pores are formed at least on the surface or in surface regions of the filaments and at least some of the pores are pores that are open outward, and at least some of the open pores are filled with the active substance, in particular with the active liquid.
Claims17
A method of making a fleece for sustained-released system or storage of an active liquid, the method comprising the steps of:
- spinning from a plastic material continuous bicomponent core/sheath filaments by a spinneret;
- foaming the plastic material only of the sheaths of the continuous filaments so that pores are formed in the sheaths at least on a surface of the continuous filaments and at least 15% of the pores open outward;
- using a nonpermanent conditioning agent as the active liquid;
- filling the open pores at least partially with the active liquid;
- and
- forming the continuous filaments into the fleece.
A method of making a fleece comprising the steps of:
- providing two supplies of a spinnable plastic material;
- adding a foaming agent to the material of only one of the two supplies;
- spinning the materials of both supplies together from a spinneret to form sheath/core bicomponent continuous filaments whose sheaths are formed by the material containing the foaming agent such that as the materials exit the spinneret the foaming agent expands and forms only in the sheath pores of which at least 15% are outwardly open;
- forming the spun continuous filaments into a fleece;
- and
- at least partially filling the open pores with an active liquid consisting of a nonpermanent conditioning agent.
Dependencies are inferred from the claim text.