Adhesive Removal from Packaging Material

Two-component curing adhesive for laminates that exhibits releasability when immersed in an alkaline aqueous solution while maintaining adhesion. The adhesive has an isocyanate composition containing an polyisocyanate compound and an isocyanate-reactive composition with an active hydrogen group-containing compound. The active hydrogen compound has an average functional number of hydroxyl groups of 1.5-3.0 and acid groups of 0.2-2.0. This adhesive allows easy separation of laminated materials like packaging by immersion in alkali compared to conventional adhesives.

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Automated label removal device for glass jars that eliminates the need for chemicals and prevents jar damage. The device uses a conveyor, cameras, spray nozzles, vibrating trays, grippers, robotic arms, and air blowers. Jars are placed on the conveyor and imaged. Cleaning solution and oil are sprayed. Jars are vibrated with baking soda. Grippers transfer jars to a wiping platform. Robotic arms remove labels. Hot air blows jars clean. The conveyor moves jars to collection.

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A label for PET bottles that can be easily removed without leaving adhesive residue on the bottle. The label is a pressure-sensitive adhesive strip label coated with a fast drying adhesive. This allows the label to be easily peeled off the PET bottle without leaving adhesive behind. The fast drying adhesive prevents residue compared to slow drying adhesives. The label can be made using non-shrinking film or shrinkable film as the label material. This improves recyclability of PET bottles by preventing adhesive contamination during recycling.

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Label for PET bottles like water bottles that can be easily removed without leaving adhesive residue on the bottle after label removal. The label is coated with a pressure sensitive adhesive instead of the conventional slow drying adhesive. This allows the label to be easily peeled off without sticking to the PET bottle. This prevents adhesive residue on the bottle that can cause issues in recycling. The pressure sensitive adhesive is applied to the label before attaching it to the PET bottle.

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A label for PET bottles like water bottles that can be easily removed without leaving adhesive residue on the bottle surface. The label uses a pressure sensitive adhesive coating on the label instead of the conventional slow-drying adhesives. This allows the label to be easily peeled off without residue when removed. It solves the problem of adhesive residue in PET bottle recycling by using a label that can be completely separated and reuses the PET bottle without contamination. The label can be made with non-shrinkable or shrinkable film, depending on the bottle shape. The pressure sensitive adhesive allows easy label removal without residue, improving PET bottle recycling yield and quality.

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Recyclable, oil/grease-resistant paper packaging without fluorochemicals that uses a multiwall structure with coaligned adhesive layers. The packaging has an outer paper ply, an intermediate paper ply, and an inner polymer film ply. The outer and inner layers are adhered using separate aligned adhesive areas with non-overlapping spots. This allows the inner polymer film to be easily separated during recycling of the paper layers. The outer paper ply can be inherently grease-resistant or coated, avoiding fluorochemicals.

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Recyclable packaging structure that allows easy separation of the adhesive from the protective layer. The packaging has a protective film with openings and fastening strips with adhesive. The strips attach to the film and product through the openings. This keeps the product enclosed without fully adhering the film to it. The strips can be easily removed to recycle the film separately.

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Packaging structure for electronic devices that prevents glue residue when removing protective films. The packaging has side strips attached to the device body edges and a heat shrinkable sealing film extending between the strips. The film has engraved lines perpendicular to the device surface. This allows the film to be easily shrunk and sealed around the edges, preventing adhesive residue when removing protective films.

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Recyclable packaging structure for covering products that allows the protective film to be directly recycled without adhesive residue. The packaging has a protective film with openings covered by strips with adhesive on one side. The strips attach to the product and film to securely hold the product in the film. This separates the adhesive from the film so it can be easily removed for recycling without residue on the film. The strips also cover the openings in the film.

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A packaging container for liquids that prevents staining and waste when opening. The container has a pouch made of a film material with a discharge port. An adhesive sheet surrounds the discharge port and can be easily peeled off. The adhesive sheet has an adhesive strength of 1.0-4.0 N/15 mm to the pouch. This allows the user to peel off the adhesive sheet to access the contents without staining their hands or surfaces. The adhesive strength prevents leakage but is low enough for easy peeling.

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Washable labels for reusable packaging that can be easily removed without residue when washed. The labels have a discontinuous pattern on the adhesive side created by applying a spacer above the adhesive. This prevents complete adhesion in some areas, making it easier to wash off the label when the packaging is cleaned. The spacer thickness is optimized to balance adhesion and washability.

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Disposable bottle design that simplifies recycling by allowing easy removal of the wrapping paper and adhesive without separate processing. The bottle has a scraper integrated into the lid that separates the wrapping paper from the main body when the lid is rotated. This automatically removes the wrapping paper after use, preventing residue and adhesive on the bottle. The scraper can be made of plastic or metal and extends below the wrapping paper to separate it.

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Washable labels for reusable and recyclable packaging that can easily be removed by washing. The label has a discontinuous pattern of spacing agent over the adhesive, shielding some areas from sticking. The spacing agent thickness is 0.5-200 microns. This allows adhesion during storage/use but washing removes the label. The discontinuous pattern facilitates washing by providing channels for water to reach uncoated adhesive.

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Recyclable packaging container with separable parts for easy disassembly during recycling. The container has an inner cup and an outer shell that can be separated by peeling apart adhesive segments in the overlap area. The adhesive segments are applied to the ends of the blank that forms the shell during winding. The segments have a longitudinal extent between the ends. When the shell is applied to the cup, the segments join the ends together. During recycling, pressure deforms the container enough to separate the segments and peel apart the shell ends.

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Packaging film laminate that can be easily disassembled into the separate films without adding a disassembly additive to the adhesive layer. The laminate has an intermediate layer with a structure that cleaves in response to external stimuli like UV or heat. This peelable layer allows separation of the films from the laminate without damaging them. It enables recycling of the films by selectively applying the stimulus to the intermediate layer. The stimulus can be physical separation, immersion in liquid, or washing after separation.

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Multilayer film for packaging applications that allows easy peeling from ethylene-based resins like LDPE. The film has an outer layer that can be adhered and peeled from ethylene-based resins, and an inner layer that can be adhered to polystyrene or PP resins. The inner layer has a peel strength of 3 N/15 mm or more when heat-sealed to the inner surface. This enables the inner layer to adhere to inner surfaces without an adhesive, while the outer layer easily peels from outer surfaces. The film can also have a gas barrier layer between the layers.

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Solvent-based polyurethane adhesive for bonding flexible packaging materials that can be debonded by water treatment. The adhesive composition contains a polyurethane polymer made by reacting polyether polyol and polyisocyanate. It also has organic solvents like ethyl acetate and ethanol. The adhesive cures to bond flexible packaging layers like polyolefins or polyesters. Treating the bonded packaging with water debonds the layers for recycling.

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Recycling plastic packaging materials by improving detachability of printed layers and adhesives to enable separation and recovery of the base plastic substrate. The key is adding surfactants to the layers that contact the base plastic, such as inks, primers, and adhesives. These surfactants enable easier desorption and prevent reattachment of the detached layers to the base plastic during recycling processes. This allows clean separation and recycling of the base plastic without contamination from the previously printed or adhered layers.

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Wrapped absorbent product with a foldable bag packaging that allows easy removal of the absorbent product while preventing leakage and odor. The packaging has a fold line separating a bag part and a non-bag part. The absorbent product is folded into the bag part. The adhesive part is on the non-bag part side. When ejected, the release layer peels off the main body instead of the bag. This prevents the adhesive from sticking to the bag. The fold line allows easy separation. The bag keeps leakage contained.

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