Method for recycling a product with a glue

Abstract

This invention belongs to the field of die-cutting technology and relates to a method for recycling and reusing adhesive-coated products. The method includes the following steps: collecting defective adhesive-coated products from a waste bin; placing the defective products into an adhesive removal device and immersing them in an adhesive removal solvent; ultrasonically removing the adhesive without a substrate; and then washing and drying to obtain the de-adhesive-coated product. Compared with existing technologies, this invention enables the recycling and reuse of defective adhesive-coated products, reduces waste disposal, and saves significant costs.

Description

Technical Field

[0001] This invention belongs to the field of die-cutting technology, and in particular relates to a method for recycling and reusing adhesive products. Background Technology

[0002] In the field of die-cutting technology, one type of die-cutting process involves attaching label components to the surface of a corresponding product. To improve production efficiency, the products to be labeled are typically pre-wound into rolls, which are then supplied to the labeling station as a continuous product strip by the feeding mechanism of the labeling machine. The label components are then individually removed from the corresponding label rolls and supplied to the labeling station to be attached to the products on the product strip. Since both the product strip and the labels are in motion, high-precision alignment of the strip-shaped product and the sheet-shaped labels is required to ensure correct attachment.

[0003] When existing labeling machines align sheet labels and product tapes, approximately 30% to 40% of the sheet labels and product tapes cannot be aligned with high precision, resulting in material waste. Over time, this leads to a large amount of wasted finished products, requiring the recycling and reuse of the aforementioned misaligned labeling products. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art by providing a method for recycling and reusing adhesive products, thereby reducing production waste of adhesive products.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] This invention provides a method for recycling and reusing adhesive products, comprising the following steps: immersing the defective adhesive product in an adhesive removal solvent and ultrasonically removing the substrate-free adhesive. The substrate-free adhesive is a substrate-free double-sided adhesive tape.

[0007] Furthermore, the viscosity of the substrate-free adhesive is 6-8 N / 10 mm.

[0008] Further, the adhesive remover is a mixture of kerosene and isopropanol in a mass ratio of 1:(0.5-1.5). Preferably, the adhesive remover is a mixture of kerosene and isopropanol in a mass ratio of 1:1. The adhesives of substrate-free double-sided tapes are typically composed of polymers such as elastomeric pressure-sensitive adhesives, resin-based pressure-sensitive adhesives, or acrylic pressure-sensitive adhesives. Both kerosene and isopropanol are organic solvents, thus they can effectively dissolve these types of adhesives. Furthermore, these two solvents have different polarities; isopropanol has a certain polarity, while kerosene has a lower polarity. This difference in polarity helps dissolve components of different polarities in the adhesive. When used in combination, they can produce a synergistic effect, improving dissolution efficiency. Simultaneously, the volatility of isopropanol helps to quickly remove the dissolved adhesive, reducing residue. The physical solubility properties of kerosene and isopropanol, along with their safety and economy, make this combination an effective solvent for removing substrate-free adhesives.

[0009] Further, the amount of adhesive remover is: 500g of adhesive remover is used to immerse 800 to 1200 defective adhesive products. Preferably, 500g of adhesive remover is used to immerse 1000 defective adhesive products.

[0010] Furthermore, viewed from above, the shape of the defective adhesive product is a closed figure composed of two straight line segments and five arc segments.

[0011] Furthermore, the volume of the defective adhesive product is 3mm. 3 ~7mm 3 Preferably 5mm 3 The thickness of defective adhesive products is 0.1mm to 0.2mm.

[0012] Furthermore, the ultrasonic adhesive removal temperature is 30℃~60℃, the ultrasonic frequency is 28kHz~60kHz, and the ultrasonic power is 500W~800W. Within the temperature range of 30℃~60℃, the activity of the adhesive removal solvent components can be improved, the molecular motion of the solvent can be accelerated, and the solvent's penetration and dissolution ability on the substrate-free double-sided tape adhesive can be enhanced, thus accelerating the dissolution of the adhesive. Compared with traditional high-temperature cleaning methods, this temperature range is more environmentally friendly and energy-saving, reducing energy consumption while maintaining good cleaning results and ensuring solvent stability, avoiding solvent decomposition or volatilization due to excessively high temperatures.

[0013] Furthermore, the adhesive without a substrate is ultrasonically removed in the adhesive removal equipment, and the product is obtained after washing and drying.

[0014] Furthermore, the water washing temperature is 10℃~30℃.

[0015] Furthermore, the drying temperature is 10℃~30℃.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] (1) This invention provides a method for recycling and reusing adhesive products. Within a temperature range of 30℃ to 60℃, kerosene and isopropanol in a mass ratio of 1:(0.5~1.5) are used as adhesive removal solvents for ultrasonic removal. The adhesive on defective double-sided adhesive tape without a substrate is typically composed of elastomer, resin, or acrylic pressure-sensitive adhesives. Kerosene, as a non-polar solvent, and isopropanol, as a polar solvent, can dissolve both the polar and non-polar components of the adhesive. When used together, due to their polarity differences, they produce a synergistic effect, improving dissolution efficiency. Furthermore, the volatility of isopropanol helps to quickly remove the dissolved adhesive, reducing residue. In addition, the temperature range of 30℃ to 60℃ can improve the activity of the adhesive remover components, accelerate the molecular movement of the solvent, enhance the solvent's penetration and dissolution ability on the adhesive, and avoid solvent decomposition or volatilization caused by excessive temperature. The water washing and drying steps after ultrasonic adhesive removal can remove the adhesive remover residue on the product surface, making the surface of the recycled product indistinguishable from the surface of the product before labeling, with no adhesive or adhesive remover residue.

[0018] (2) This invention provides a method for recycling and reusing adhesive products. By using a simple adhesive removal solvent, the adhesive that is misaligned and without a substrate is removed by ultrasonication, reducing the amount of waste and enabling the recycling of defective adhesive products, thus saving a lot of costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the appearance of the defective adhesive product of the present invention, wherein (a) is a front view and (b) is a top view;

[0020] Figure 2 This is a schematic diagram of the adhesive removal device of the present invention, wherein (a) is a front view, (b) is a side view, and (c) is a top view;

[0021] Figure 3 This is a process flow diagram of the adhesive product recycling and reuse method of the present invention.

[0022] Explanation of markings in the diagram:

[0023] 1-Product, 2-Substrate-free double-sided adhesive tape, 3-Ultrasonic generator. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, the terms "first," "second," and "third," etc., are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of the invention can be implemented in a sequence other than that illustrated or described herein, and the objects distinguished by "first," "second," and "third," etc., are generally of the same class and do not limit the number of objects; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects; the character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] This invention provides a method for recycling and reusing adhesive-coated products, comprising the following steps: collecting defective adhesive-coated products from a waste collection box, placing the defective products into an adhesive removal device, immersing them in an adhesive removal solvent, ultrasonically removing the substrate-free adhesive for 50-60 minutes, and then washing and drying to obtain the adhesive-free product. The substrate-free adhesive is a substrate-free double-sided adhesive tape.

[0028] In some specific embodiments, the viscosity of the substrate-free adhesive is 6-8 N / 10 mm.

[0029] In some specific embodiments, the degumming solvent is kerosene and isopropanol in a mass ratio of 1:(0.5-1.5). Preferably, the degumming solvent is kerosene and isopropanol in a mass ratio of 1:1.

[0030] In some specific embodiments, the amount of adhesive remover is: 800 to 1200 defective adhesive products are immersed in 500g of adhesive remover. Preferably, 1000 defective adhesive products are immersed in 500g of adhesive remover.

[0031] In some specific embodiments, viewed from above, the shape of the defective adhesive product is a closed figure composed of two straight line segments and five arc segments.

[0032] In some specific embodiments, the volume of the defective adhesive product is 3mm. 3 ~7mm 3 Preferably 5mm 3 The thickness of defective adhesive products is 0.1mm to 0.2mm.

[0033] In some specific implementations, the ultrasonic degumming temperature is 30℃~60℃, the ultrasonic frequency is 28kHz~60kHz, and the ultrasonic power is 500W~800W.

[0034] In some specific implementations, the water washing temperature is 10℃~30℃, and the water washing time is 10~20 minutes.

[0035] In some specific implementations, the drying temperature is 10℃~30℃, and the drying time is 10~20 minutes.

[0036] In the following embodiments or examples, unless otherwise specified, the functional components or structures are conventional components or structures used in the art to achieve the corresponding functions. For example, the adhesive removal equipment used in the following embodiments is an SCQ-8201C ultrasonic cleaner.

[0037] Example 1

[0038] This invention provides a method for recycling and reusing adhesive products, such as... Figure 3 As shown, the process includes the following steps: collecting defective products from the waste disposal box, and placing the defective products into a container such as... Figure 2 The adhesive removal equipment shown involves immersing defective products in an adhesive removal solvent. This solvent does not corrode the product but dissolves the substrate-free adhesive. The adhesive is removed by ultrasonication for 50 minutes. The product is then washed with deionized water and air-dried to obtain the de-adhesive-free product. The substrate-free adhesive is a substrate-free double-sided adhesive tape.

[0039] In this embodiment, the viscosity of the substrate-free adhesive is 8 N / 10 mm.

[0040] In this embodiment, the adhesive remover is a mixture of kerosene and isopropanol in a mass ratio of 1:1.

[0041] In this embodiment, the amount of adhesive remover used is: 1200 defective adhesive products are immersed in 500g of adhesive remover.

[0042] In this embodiment, as Figure 1 As shown, viewed from above, the shape of the defective adhesive product is a closed shape composed of two straight line segments and five arc segments, and the adhesive without a substrate cannot be aligned with the product.

[0043] In this embodiment, the volume of the defective adhesive product is 5mm. 3 The thickness of defective adhesive products is 0.2mm.

[0044] In this embodiment, the ultrasonic adhesive removal temperature is 45°C, the ultrasonic frequency is 40kHz, and the ultrasonic power is 700W.

[0045] In this embodiment, the water washing temperature is 30°C, and the washing time is 10 minutes.

[0046] In this embodiment, the air-drying temperature is 30°C, and the air-drying time is 10 minutes.

[0047] Inspection revealed that the removal of the substrate-free double-sided tape was effective, achieving a 99% recovery rate for defective products in this embodiment. The recovered products showed no difference in surface smoothness or cleanliness compared to the products awaiting labeling, and were free of grease, dust, or other contaminants. Furthermore, after relabeling the recovered products, a dyne pen test showed a surface tension coefficient of 51 dynes, facilitating the subsequent printing of QR codes on the labels for workpiece identification.

[0048] Example 2

[0049] This invention provides a method for recycling and reusing adhesive products, such as... Figure 3 As shown, the process includes the following steps: collecting defective products from the waste disposal box, and placing the defective products into a container such as... Figure 2 The adhesive removal equipment shown involves immersing defective products in an adhesive removal solvent. This solvent does not corrode the product but dissolves the substrate-free adhesive. The adhesive is removed by ultrasonication for 60 minutes. The product is then washed with deionized water and air-dried to obtain the de-adhesive-free product. The substrate-free adhesive is a substrate-free double-sided adhesive tape.

[0050] In this embodiment, the viscosity of the substrate-free adhesive is 6 N / 10 mm.

[0051] In this embodiment, the adhesive remover is a mixture of kerosene and isopropanol in a mass ratio of 2:1.

[0052] In this embodiment, the amount of adhesive remover used is: 800 defective adhesive products are immersed in 500g of adhesive remover.

[0053] In this embodiment, viewed from above, the shape of the defective adhesive product is a closed shape composed of two straight line segments and five arc segments, and the adhesive without a substrate cannot be aligned with the product.

[0054] In this embodiment, the volume of the defective adhesive product is 3mm. 3 The thickness of defective adhesive products is 0.1mm.

[0055] In this embodiment, the ultrasonic adhesive removal temperature is 30°C, the ultrasonic frequency is 28kHz, and the ultrasonic power is 500W.

[0056] In this embodiment, the water washing temperature is 10°C, and the washing time is 20 minutes.

[0057] In this embodiment, the air-drying temperature is 10°C and the air-drying time is 20 minutes.

[0058] Inspection revealed that the removal effect of the substrate-free double-sided tape was excellent, with a 98% recovery rate for defective products in this embodiment. The recovered products showed no difference in surface smoothness or cleanliness compared to the products to be labeled, and were free of grease, dust, or other contaminants. Furthermore, after the recovered products were relabeled, a dyne pen test showed a surface tension coefficient of 51 dynes, facilitating the subsequent printing of QR codes on the labels for workpiece identification.

[0059] Example 3

[0060] This invention provides a method for recycling and reusing adhesive products, such as... Figure 3 As shown, the process includes the following steps: collecting defective products from the waste disposal box, and placing the defective products into a container such as... Figure 2 The adhesive removal equipment shown involves immersing defective products in an adhesive removal solvent. This solvent does not corrode the product but dissolves the substrate-free adhesive. The adhesive is removed by ultrasonication for 60 minutes. The product is then washed with deionized water and air-dried to obtain the de-adhesive-free product. The substrate-free adhesive is a substrate-free double-sided adhesive tape.

[0061] In this embodiment, the viscosity of the substrate-free adhesive is 7 N / 10 mm.

[0062] In this embodiment, the adhesive remover is a mixture of kerosene and isopropanol in a mass ratio of 1:1.5.

[0063] In this embodiment, the amount of adhesive remover is: 500g of adhesive remover is used to immerse 1000 defective adhesive products.

[0064] In this embodiment, viewed from above, the shape of the defective adhesive product is a closed shape composed of two straight line segments and five arc segments, and the adhesive without a substrate cannot be aligned with the product.

[0065] In this embodiment, the volume of the defective adhesive product is 7mm. 3 The thickness of defective adhesive products is 0.1mm.

[0066] In this embodiment, the ultrasonic adhesive removal temperature is 60°C, the ultrasonic frequency is 60kHz, and the ultrasonic power is 800W.

[0067] In this embodiment, the water washing temperature is 20°C, and the washing time is 15 minutes.

[0068] In this embodiment, the air-drying temperature is 25°C, and the air-drying time is 15 minutes.

[0069] Inspection revealed that the removal of the substrate-free double-sided tape was effective, achieving a 98% recovery rate for defective products in this embodiment. The recovered products showed no difference in surface smoothness or cleanliness compared to the products awaiting labeling, and were free of grease, dust, or other contaminants. Furthermore, after relabeling the recovered products, a dyne pen test showed a surface tension coefficient of 50 dynes, facilitating the subsequent printing of QR codes on the labels for workpiece identification.

[0070] Comparative Example 1

[0071] This comparative example provides a method for removing substrate-free adhesive using commercially available 3M adhesive remover, allowing for the recycling of adhesive-bonded products. The difference from Example 1 is that it does not use kerosene and isopropanol as adhesive removers, and ultrasonic adhesive removal is performed within a temperature range of 30°C to 60°C. This comparative example includes the following steps:

[0072] Collect defective products from the waste collection box, such as... Figure 1 As shown, viewed from above, the defective adhesive product has a closed shape composed of two straight line segments and five arc segments, and the adhesive without a substrate cannot be aligned with the product. Commercially available 3M adhesive remover is sprayed directly onto the adhesive-free area, left to stand for 50 minutes to allow the remover to penetrate and wet the residual adhesive, then the residual adhesive is removed using a small plastic spatula. After washing with deionized water and air drying, the adhesive-free product is obtained. The adhesive without a substrate is a double-sided adhesive tape.

[0073] In this comparative example, the water washing temperature was 30°C, and the washing time was 10 minutes.

[0074] In this comparative example, the air-drying temperature was 30°C, and the air-drying time was 10 minutes.

[0075] Inspection revealed that the removal effect of the substrate-free double-sided tape was poor, with a 20% recovery rate of defective products in this comparative example. Compared to the products to be labeled, the recovered products still had adhesive residue, dust, and grease on their surfaces. Furthermore, after the recovered products were relabeled, a dyne pen test showed that the surface tension coefficient was only 5 dynes, which is not conducive to subsequent printing of QR codes on the labels and cannot be used for workpiece identification.

[0076] In addition, compared with Example 1, this comparative example requires manual removal of the substrate-free adhesive, which consumes a lot of manpower and time costs.

[0077] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A method for recycling and reusing adhesive products, characterized in that, The process includes the following steps: immersing the defective adhesive product in an adhesive removal solvent and ultrasonically removing the adhesive without a substrate.

2. The method for recycling and reusing adhesive products according to claim 1, characterized in that, The viscosity of the substrate-free adhesive is 6-8 N / 10 mm.

3. The method for recycling and reusing adhesive products according to claim 1, characterized in that, The adhesive remover is a mixture of kerosene and isopropanol in a mass ratio of 1:(0.5-1.5).

4. A method for recycling and reusing adhesive products according to claim 1, characterized in that, The amount of adhesive remover used is: 500g of adhesive remover is used to immerse 800 to 1200 defective adhesive products.

5. A method for recycling and reusing adhesive products according to claim 1, characterized in that, Viewed from above, the defective adhesive product is a closed shape consisting of two straight line segments and five arc segments.

6. A method for recycling and reusing adhesive products according to claim 1, characterized in that, The volume of the defective adhesive product is 3mm. 3 ~7mm 3 The thickness is 0.1mm to 0.2mm.

7. A method for recycling and reusing adhesive products according to claim 1, characterized in that, The ultrasonic adhesive removal temperature is 30℃~60℃, the ultrasonic frequency is 28kHz~60kHz, and the ultrasonic power is 500W~800W.

8. A method for recycling and reusing adhesive products according to claim 1, characterized in that, The adhesive without a substrate is removed by ultrasonic treatment in an adhesive removal device, and the product is obtained by washing and drying.

9. A method for recycling and reusing adhesive products according to claim 8, characterized in that, The washing temperature is 10℃~30℃.

10. A method for recycling and reusing adhesive products according to claim 8, characterized in that, The drying temperature is 10℃~30℃.

Images