Sterilizable and printable nonwoven packaging materials
AssigneeA. Ahlstrom Corporation
InventorsDouglas McKee Benton, Rui Ferreira
Life of this patent
Estimating the term…
Abstract
Sterilizable and printable, wet-laid non-woven substrate exhibiting high-strength and temperature resistance above 140° C., providing sufficient airflow to relieve pressure in a package formed from the substrate during sterilization, providing a significant barrier to penetration by bacteria and debris, and which is sealable to itself and to thermoplastic films, comprises blends of nanofibrillated lyocell fibers, microfibers, fibers having a flat, rectangular cross-section and binder fibers.
Claims21
A multi-layer non-woven sterilizable packaging material comprising:
- a top layer comprising nanofibrillated lyocell fibers;
- and
- a bottom layer comprising a blend of:
- (a) microfibers;
- (b) synthetic fibers having a flat, generally rectangular cross-section with at least one dimension that is generally flat and a length of about 5 to 10 millimeters, the synthetic fibers having a flat, generally rectangular cross-section are ribbon-like fibers that have split apart from splittable conjugated fibers, the splittable conjugated fibers comprising a PET component and a Nylon component, such that a first of the ribbon-like fibers that have split apart from the splittable conjugated fibers consists of the PET component and a second of the ribbon-like fibers that have split apart from the splittable conjugated fibers consists of the Nylon component;
- (c) binder fibers;
- (d) a first polymeric fiber having a first linear density and a first length;
- and
- (e) a second polymeric fiber having a second linear density and a second length both greater than the first linear density and first length of the first polymeric fiber;
- the packaging material having a Log Reduction Value greater than 2.
A multi-layer non-woven sterilizable packaging material comprising:
- a top layer comprising nanofibrillated lyocell fibers;
- and
- a bottom layer having a bottom layer weight that is about 2 to 3 times a top layer weight of the top layer, the bottom layer comprising a blend of:
- (a) microfibers;
- (b) synthetic fibers having a flat, generally rectangular cross-section with at least one dimension that is generally flat and comprising ribbon-like fibers that have split apart from splittable conjugated fibers, the synthetic fibers having a flat, generally rectangular cross-section are ribbon-like fibers that have split apart from splittable conjugated fibers, the splittable conjugated fibers comprising a PET component and a Nylon component, such that a first of the ribbon-like fibers that have split apart from the splittable conjugated fibers consists of the PET component and a second of the ribbon-like fibers that have split apart from the splittable conjugated fibers consists of the Nylon component;
- (c) binder fibers;
- (d) a first polymeric fiber having a first linear density and a first length;
- and
- (e) a second polymeric fiber having a second linear density and a second length both greater than the first linear density and first length of the first polymeric fiber,
- the packaging material having a dry process tensile strength of at least about 10,000 grams per 25 meters in the machine direction and at least about 6,000 grams per 25 millimeters in the cross direction.
Dependencies are inferred from the claim text.