Patent Application
20230348170
This invention relates to a bag, such as t-shirt, merchandise, dry cleaning, vegetable, grocery, carry, and food bags, and more particularly relates to a bag that can be converted into another use.
Conventional plastic bags are of many types and uses. Bags can be used to carry merchandise, such as food or household items after purchase, to package items from manufacturer to store to consumer, such as for wrapped clothing, or to package items in a store, such as fruits and vegetables. The bags have many different names, e.g., t-shirt, merchandise, dry cleaning, vegetable, grocery, carry, and food bags.
Such conventional plastic bags, however, are generally not curbside recyclable because of restrictions imposed by refuse collection services that require the customer to take such plastic bags to a closed loop recycling bin, specifically for recycling plastic film and bags. These bins are often located at grocery stores and big box stores. Consequently, many conventional plastic bags end up in a landfill or disposed of as litter. Moreover, conventional plastic bags are not biodegradable and will remain in a landfill or other environment for extended periods of time.
To improve the environmental footprint of open top plastic bags, this invention allows the reuse of the plastic bags in in secondary applications such as a table protector for craft projects or as a soil biodegradable weed block. To further improve the environmental footprint of the plastic bags, the bags can be made from biodegradable materials and further incorporate additional functionality as also possible with the non-biodegradable bags.
The non-biodegradable bags can be produced from any plastic material including polyethylene (PE) such as low density, medium density, linear low density, and high density PE, polypropylene (PP) including homopolymer, random copolymer and heterophasic copolymer PP, and blends of any of the materials.
The material for the biodegradable bags can be produced from any biodegradable material, including those that are industrial or backyard (home) compostable, soil biodegradable, water biodegradable, or anaerobically biodegradable. Such plastics include polylactic acid (PLA), polyhydroxyalkanoate (PHA), polybutylene succinate (PBS), polybutylene adipate terephthalate (PBAT), thermoplastic starch (TPS), cellulose acetate (CA), polybutylene adipate succinate (PBAS), and blends thereof. One specific biodegradable plastic formulation is a biodegradable aliphatic polyester produced primarily from diacid and diol monomers and described in detail in U.S. Patent Publication No. 2019/0375932, published Dec. 12, 2019 (now U.S. Pat. No. 11,608,436), which is incorporated herein by reference in its entirety. The inventive biodegradable plastic formulation is 90% biodegradable in soil in about 90 days or 90% biodegradable in water in about 451 days.
The secondary use of the plastic bag can be encouraged through printing or cut lines or through perforations and tear lines to allow easy reconfiguration of the bag into another use. Such uses include a tabletop protector for craft projects, a drop cloth for furniture or floor protection, weed block for preventing weed growth in the garden, or a moisture retention film to keep water from draining into sand and thereby to help keep plants watered in low rainfall locations. Furthermore, perforations or printed cut lines may also exist for indicating locations or separations for holes to plant plants through the bag when used as a moisture barrier or weed block. The bag of the present invention has a front panel and a back panel. The front panel and back panel are joined at their side edges and bottom edge to form the bag with a top opening. Optionally, handles exist by extending from the top of the front panel and back panel or as cut outs in front and back panel.
In one embodiment, the bag of the present invention is constructed with microperforations that extend along the side edges of the bag and along the top edges of the handles. By breaking the bag at the microperforations along the sides of the bag and along the top edges of the handles, the bag unfolds along the bottom edge to create a flat sheet that can be used as cover for a craft table or drop cloth, or if soil or water biodegradable, as a weed block or moisture barrier. Alternatively, the microperforations can extend along one side edge, along the bottom edge, and along the top edges of the handles to create a flat sheet.
The bag of the present invention may additionally have tear perforations for enabling easy removal of some of the bag. The tear perforations may outline a circle, concentric circles, squares, an X or any other shape. After material is removed along the tear perforations, plants may be planted through a biodegradable bag using the newly created hole(s).
In order to use the weed suppression sheet created by breaking open the bag along the microperforations, the weed suppression sheet is laid on top of the underlying soil of a planting bed. The user can then punch or tear out holes in the weed suppression sheet to accommodate plants. Once planting is complete, additional soil or mulch can be laid on top of the bag. The weed suppression sheet controls weeds as the plants established themselves, and after a short few months depending upon film thickness and film material formulation, the weed suppression sheet will have basically disappeared so that future digging in the planting bed will not be hindered by the weed suppression sheet.
Further objects, features and advantages will become apparent upon consideration of the following detailed description of the invention when taken in conjunction with the drawings and the appended claims.
With reference to
The non-biodegradable bags can be produced from any plastic material including polyethylene (PE) such as low density, medium density, linear low density and high density PE, polypropylene (PP), including homopolymer, random copolymer and heterophasic copolymer PP, and blends of any of the materials.
For a biodegradable bag 10 and resulting weed suppression sheet 38, the formulation of the material is a biodegradable aliphatic polyester produced primarily from diacid and diol monomers, described in detail in U.S. Patent Publication No. 2019/0375932, published Dec. 12, 2019, (now U.S. Pat. No. 11,608,436), which is incorporated herein by reference in its entirety.
The biodegradable bag 10 can be broken down into a flat sheet to create a weed suppression sheet 38 (
The left handle 26 has left front handle microperforations 34 and left back handle microperforations 36 extending along the top edges of the handle 26. The right handle 27 has right front handle microperforations 35 and right back handle microperforations 37 extend along the top edges of handle 27.
In order to create the weed suppression sheet 38 of
By breaking the microperforations shown in
In order to use the weed suppression sheet 38 created by breaking open the bag along the microperforations (
While this invention has been described with reference to preferred embodiments thereof, it is to be understood that variations and modifications can be affected within the spirit and scope of the invention as described herein and as described in the appended claims.
This invention claims priority from U.S. Provisional Patent Application No. 63/335,280, filed Apr. 27, 2022, which is hereby incorporated by reference.
| Number | Date | Country | |
|---|---|---|---|
| 63335280 | Apr 2022 | US |
