RKW has been granted a patent for a multi-layer collation shrink film featuring a polyethylene main layer and a polar ethylene copolymer skin layer. The film includes silica and a slip agent to reduce friction, enhancing its use in multi-layer packaging and allowing for digital ink printing. GlobalData’s report on RKW gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on RKW, was a key innovation area identified from patents. RKW's grant share as of June 2024 was 43%. Grant share is based on the ratio of number of grants to total number of patents.
The granted patent US12023898B2 describes a multi-layer collation shrink film designed for packaging objects. The film consists of a main layer made from a polyethylene mixture, which includes 75 to 85 wt.-% low-density polyethylene and 15 to 25 wt.-% high-density polyethylene or linear low-density polyethylene. Additionally, the film features a skin layer composed of a polar ethylene copolymer containing vinyl acetate or alkyl (meth)acrylate, with a minimum of 15 wt.-% of these components. The skin layer also incorporates silica in concentrations ranging from 5000 to 20000 ppm and a slip agent, which is intended to reduce friction during handling. The slip agent is present in amounts between 0.01 to 0.1 wt.-%, and the film's thickness can vary from 20 to 150 µm.
The patent further details various configurations and properties of the film, including specific ranges for silica content, vinyl acetate or alkyl (meth)acrylate content, and slip agent amounts. The film is engineered to exhibit desirable characteristics such as shrinkage, tear resistance, gloss, and haze, meeting specific ASTM standards. The method for using this film involves arranging objects into a bundle, wrapping the film around the bundle, sealing it, and applying heat to shrink the film, followed by cooling. The patent also notes that the film can be printed with digital ink before or after the packaging process, enhancing its utility for packaging beverages or food containers. Overall, the invention aims to improve the efficiency and effectiveness of packaging processes while ensuring the integrity of the packaged items.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
