Biodegradable waste collection bag with extended service life, optical distinguishability and high wet tear strength

Abstract

Biodegradable waste collection bag (1) for the collection of organic waste in accordance with the Bio-Waste Ordinance, comprising: • a foil cover (3) with two carrying handles (1), • Made from extrudable, 100% biodegradable polymer material selected from polyhydroxyalkanoates (PHA), modified regenerated cellulose, starch esters / ethers or mixtures thereof, • a visual design (2) to clearly distinguish from conventional plastic carrier bags, • a liquid-tight seam (4) and a bottom area (5), wherein the film sleeve (3) has a thickness in the range of 21 µm to 26 µm, preferably 23 µm to 25 µm, and a maximum of 80 µm and remains tear-resistant and liquid-tight for at least 10 days when filled (≥ 2-5 l moist biowaste).

Description

Technical field

[0001] The invention relates to waste collection bags made of biodegradable film material, in particular for the collection of organic waste in compliance with the Bio-Waste Ordinance (BioAbfV). State of the art

[0002] PLA- and PBAT-based biodegradable bags represent the state of the art, but are often not fully compliant with the German Biowaste Ordinance (BioAbfV) and are visually almost indistinguishable from conventional plastic bags. Pure cellulose films (cellophane, regenerated jute cellulose) cannot be heat-sealed and quickly lose their strength when exposed to moisture. While PHA films are extrudable and water-resistant, they also suffer from the problem of being visually mistaken for plastic carrier bags. Object of the invention

[0003] A bag should be provided which: • is compliant with the BioAbfV, • Visually clearly distinguishable from conventional plastic bags, • exhibits high wet tear strength at minimal film thickness (≤ 30 µm), • when stored with moist organic waste, it remains liquid-tight and load-bearing for at least 10 days, • can be produced cost-effectively by extrusion. • Solution to the task

[0004] The problem is solved by a waste collection bag according to claim 1. Example of implementation

[0005] In Fig. Figure 1 shows a biodegradable waste collection bag consisting of a film sleeve (3) with two carrying handles (1). The visual design (2) is achieved through a matte surface embossing or a distinctive coloring to avoid confusion with conventional plastic carrier bags. The film sleeve (3) consists of an extrudable, 100% biodegradable polymer material selected from the group consisting of polyhydroxyalkanoates (PHAs), modified regenerated cellulose, starch esters / ethers, or mixtures thereof.

[0006] In Fig. Section AA is shown in Figure 2, illustrating the structure of the film sheath (3). The material thickness is a maximum of 30 µm, preferably 20-25 µm, and the film is formulated to achieve a wet tensile strength of at least 5 N.

[0007] In Fig. Figure 3 shows an enlarged cross-section of the seam (4). The film layers are liquid-tightly bonded together at the seam zone by heat welding or lamination. The bottom area (5) is flat and allows the storage of at least 5 liters of moist organic waste without any liquids passing through for at least 10 days at room temperature. Brief description of the drawings • Fig. 1: Front view of the bag with carrying handles (1), visual design (2), foil cover (3), seam (4) and bottom area (5). • Fig. 2: Sectional view AA through the foil envelope (3) with indicated material structure. • Fig. 3: Detailed view of the seam (4) in cross-section, showing the welded foil layers. Drawings

[0008] Included characters: • Fig. 1: Front view of the bag • Fig. 2: Section AA • Fig.3: Leather detail

Claims

[1] Biodegradable waste collection bag (1) for the collection of organic waste in accordance with the Bio-Waste Ordinance, comprising: • a foil cover (3) with two carrying handles (1), • Made from extrudable, 100% biodegradable polymer material selected from polyhydroxyalkanoates (PHA), modified regenerated cellulose, starch esters / ethers or mixtures thereof, • a visual design (2) to clearly distinguish from conventional plastic carrier bags, • a liquid-tight seam (4) and a bottom area (5), wherein the film sleeve (3) has a thickness in the range of 21 µm to 26 µm, preferably 23 µm to 25 µm, and a maximum of 80 µm and remains tear-resistant and liquid-tight for at least 10 days when filled (≥ 2-5 l moist biowaste). [2] Bag according to claim 1, wherein the optical design (2) is carried out by matte embossing or characteristic coloring. [3] Bags according to any of the preceding claims, wherein the manufacture is carried out by blown film or flat film extrusion and subsequent welding or lamination.

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