Artificial board identification method based on super-long room-temperature phosphorescent afterglow of adhesive

Abstract

The invention relates to the technical field of artificial board recognition, in particular to an artificial board recognition method based on an adhesive ultra-long room temperature phosphorescent afterglow signal. The method comprises the following steps: carrying out optical excitation on an artificial board bonding structure with room temperature phosphorescence characteristics; after excitation is stopped, delayed light-emitting signals are collected in a preset time window; extracting optical characteristic parameters of the delayed light-emitting signal, wherein the optical characteristic parameters comprise at least two of light-emitting color, light-emitting intensity, emission spectrum, delayed light-emitting image, phosphorescence lifetime and light-emitting area configuration combination modes; and matching the optical characteristic parameters with a preset information base so as to realize identification of the artificial board. According to the method, a room temperature phosphorescence signal of an adhesive layer interface in the board is used as an identification basis, non-destructive identification can be realized without depending on an external additional identifier, and the phosphorescence identification signal is accompanied by the whole service cycle of an artificial board product. The method has the advantages of fast and convenient identification process, strong anti-interference capability, high information stability and the like.

Description

Technical Field

[0001] This invention belongs to the field of artificial board identification and optical information detection technology, specifically relating to an artificial board identification method based on ultra-long room temperature phosphorescence afterglow of adhesives. Background Technology

[0002] Engineered wood products such as plywood, particleboard, oriented strand board (OSB), and medium-density fiberboard (MDF) are widely used in furniture manufacturing, interior decoration, construction formwork, packaging, and transportation due to their high raw material utilization, good processability, and moderate cost. Currently, these types of boards are typically made by pressing wood raw materials with adhesives, and their core functions are mainly focused on bonding, reinforcement, and shaping, lacking material-specific identification features that can reflect product identity, origin, and batch information.

[0003] Currently, commonly used methods for marking engineered wood panels mainly include inkjet printing, QR code labels, laser engraving, ink printing, and external RFID tags. These markings are mostly located on the surface of the panel or attached to its exterior. They are easily affected by wear, contamination, covering, peeling, or human replacement, and are usually not directly related to the internal structure of the material, making it difficult to achieve long-term, stable, and tamper-proof identification.

[0004] In recent years, room-temperature phosphorescent materials have attracted widespread attention in fields such as anti-counterfeiting, information encryption, delayed imaging, and identity recognition due to their long afterglow lifetime, time-resolved reading capability, and strong resistance to background interference. However, existing room-temperature phosphorescent systems are mainly applied to films, inks, coatings, or individual labels, with limited application to directly constructing stable and identifiable room-temperature phosphorescent signals at the interface of adhesive layers within engineered wood panels and establishing corresponding identification methods based on these signals.

[0005] Therefore, there is an urgent need to establish an identification method based on the room temperature phosphorescence afterglow signal inside the wood-based panel. By collecting, extracting and matching the delayed emission signal, a non-destructive and rapid identification of the wood-based panel production batch, source information and product identity can be achieved. Summary of the Invention

[0006] The purpose of this invention is to provide a method for identifying engineered wood products based on ultra-long room temperature phosphorescence afterglow of adhesives, in order to solve the problems of existing engineered wood product identification methods that rely on external labels, QR codes, surface inkjet printing or external electronic devices, which are easy to fall off, easy to counterfeit, and decoupled from the material's structural information.

[0007] The identification method described in this invention is based on the delayed luminescence behavior of room-temperature phosphorescent structural units chemically embedded in the adhesive layer interface of engineered wood products under confined conditions. Due to the presence of various interaction forces at the adhesive layer interface (such as intermolecular interactions and structural constraints), the luminescent components in the adhesive are in a relatively stable confined state after curing, thereby suppressing nonradiative transitions and extending the luminescence lifetime, allowing it to continue luminescence even after the excitation light is removed. This delayed luminescence signal is repeatable and stable, providing a reliable optical information basis for subsequent identification and comparison.

[0008] Unlike traditional information identification methods that rely on externally attached markers, the identification method of this invention utilizes room-temperature phosphorescence signals generated at the interface of the adhesive layers within the engineered wood panel as an information carrier. These optical signals are integrated with the material structure and do not depend on additional marker layers. Because this signal originates from the internal interface structure of the material, it is less susceptible to wear, contamination, or human-caused damage during use, thereby improving the stability and reliability of the identification information. Furthermore, by combining and matching various optical characteristic parameters, the distinguishability between different samples can be significantly improved, achieving high-precision identification.

[0009] In this invention, by changing parameters such as the adhesive system, the adhesive application location, and the hot-pressing process, different engineered wood panels can exhibit differentiated combinations of optical characteristic parameters during the delayed luminescence stage, thereby forming unique optical coding information. This optical coding information can be used to distinguish different manufacturers, batches, or product grades, achieving material-level information identification.

[0010] The objective of this invention and the technical problem it solves are achieved by the following technical solution: This invention provides a method for identifying engineered wood panels based on room-temperature phosphorescence afterglow signals of adhesives, comprising the following steps: Step 1, exciting an engineered wood panel adhesive structure with phosphorescence afterglow characteristics with ultraviolet light; Step 2, collecting at least two of the optical characteristic parameters of the engineered wood panel adhesive structure with phosphorescence afterglow characteristics, including emission color, emission intensity, emission spectrum, delayed emission image, phosphorescence lifetime, and configuration combination of emission regions; Step 3, matching the collected results with a preset information database; Step 4, completing the identification based on the matching results.

[0011] The engineered wood products with phosphorescent afterglow characteristics mentioned in step 1 are laminated veneer lumber, plywood, fine particleboard, particleboard, oriented strand board, MDF, finger-jointed board, blockboard and their decorative products prepared by using an adhesive that produces phosphorescent afterglow after curing and then being excited by ultraviolet light. The adhesive that produces phosphorescent afterglow after being excited by ultraviolet light can be used throughout the engineered wood product, or it can be applied in sections of the engineered wood product structure in combination with an adhesive that does not produce phosphorescent afterglow after curing.

[0012] The photoexcitation conditions in step 1 are ultraviolet light irradiation in the wavelength range of 250–400 nm.

[0013] Preferably, the photoexcitation condition in step 1 is ultraviolet light irradiation in the wavelength range of 320–380 nm.

[0014] The data acquisition in step 2 is carried out through one or more combinations of ultraviolet lamps, spectrometers, imaging equipment, time-resolved lifetime testing devices, and time-gated imaging devices.

[0015] The delayed emission image in step 2 is obtained by time-gated acquisition, with the acquisition time set within the range of 0.1 s to 60 s after the excitation light is turned off.

[0016] The preset information database in step 3 is constructed by collecting data on the emission color, emission intensity, emission spectrum, delayed emission image, phosphorescence lifetime information, and configuration of luminescent areas from standard artificial board samples with known manufacturers, raw material types, batches, performance levels, or other characteristic indicators under the same or comparable test conditions.

[0017] The matching in step 3 is based on the combination of at least two optical feature parameters; the optical feature parameters are selected from at least two of the following combinations: emission color, emission intensity, emission spectrum, delayed emission image, phosphorescence lifetime, and emission region configuration.

[0018] In step 4, when at least two optical feature parameters of the sample to be tested correspond to the parameters in the preset information database, it is determined that the sample to be tested matches the corresponding sample information.

[0019] The identification result in step 4 is the manufacturer, raw materials, batch, or authenticity of the artificial board.

[0020] The identification process is a non-destructive detection process.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects: (1) Adhesive is a factor that is deeply bound to the performance of wood-based panels. This invention uses the room temperature phosphorescence afterglow signal of the adhesive layer interface inside the wood-based panel as the identification basis. By constructing the association between the delayed emission signal and factors such as the manufacturer, raw materials, batch, and performance of the wood-based panel, the wood-based panel can be identified without relying on external labels or surface markings. The identification information is stable and not easily damaged or tampered with. (2) This invention collects the delayed emission signal after the excitation light is turned off and extracts optical feature parameters such as emission color, emission spectrum, delayed emission image and phosphorescence lifetime. It can perform matching based on multi-parameter combination to improve the distinguishability and identification accuracy between different wood-based panels. (3) This invention obtains the phosphorescence signal based on the time-resolved detection method, which effectively reduces the interference of instantaneous fluorescence and ambient background light and improves the reliability of the identification signal. (4) The identification process of this invention does not require destructive treatment of the material and can realize rapid non-destructive detection and identification of wood-based panels. (5) This invention is applicable to all wood-based panel product systems at present and has good versatility and application prospects. Detailed Implementation

[0022] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following detailed description of a method for identifying engineered wood panels based on room-temperature phosphorescence afterglow signals of adhesives is provided in conjunction with specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this invention. Non-substantial improvements and adjustments made by those skilled in the art based on the teachings of this invention should fall within the scope of protection of this invention. The following detailed description of this invention, in conjunction with specific embodiments, should not be construed as a limitation on the scope of protection of this invention. Non-substantial improvements and adjustments made by those skilled in the art based on the above-described invention should still fall within the scope of protection of this invention.

[0023] Unless otherwise specified, the raw materials, reagents, and instruments used in the following examples are all conventional products available in the art; the methods employed are all conventional methods in the art. Unless otherwise defined, the technical or scientific terms used herein should have the meanings commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] The identification method of this invention uses the room-temperature phosphorescence afterglow signal of the internal adhesive layer structure of the engineered wood panel as the identification basis. The identification basis can manifest as continuous or discontinuous phosphorescent adhesive lines, dotted phosphorescent traces, planar phosphorescent regions, or combinations thereof. The phosphorescence signal can be characterized by two or more parameters among emission color, emission intensity, emission spectrum, delayed emission image, and phosphorescence lifetime.

[0025] In this invention, the identified objects can be laminated veneer lumber, plywood, fine-particle veneer plywood, particleboard, oriented strand board, MDF, finger-jointed board, blockboard, and their veneer products. Because different manufacturers have significant differences in their selection of adhesives and production control parameters, the room-temperature phosphorescence afterglow signal formed at the interface of the adhesive layer inside the corresponding engineered wood products exhibits differences in spatial distribution and temporal decay behavior, which can be used to distinguish, identify, and determine the source.

[0026] Example: Identification of engineered wood panels based on ultra-long room temperature phosphorescence afterglow of adhesives Construction of a pre-set optical information database for engineered wood panels Three engineered wood panel companies, A, B, and C, used eucalyptus veneer and modified urea-formaldehyde resin that emits phosphorescence under ultraviolet light after curing to prepare 9-layer eucalyptus plywood. Company A selected modified urea-formaldehyde resin that emits green phosphorescence under ultraviolet light after curing, Company B selected modified urea-formaldehyde resin that emits red phosphorescence under ultraviolet light after curing, and Company C selected both modified and unmodified urea-formaldehyde resin that emits red phosphorescence under ultraviolet light after curing as adhesives, and only included room-temperature phosphorescent adhesives in four adjacent layers. The nine-layer plywood bonding structures of three companies were photoexcited using 365 nm ultraviolet light. Phosphorescence afterglow characteristics of plywood adhesive layers from three companies were collected, including emission color, emission intensity, emission spectrum, delayed emission image, phosphorescence lifetime, and adhesive layer configuration structure, to construct a phosphorescence information database for 9-layer plywood from the three companies.

[0027] Artificial board identification An unknown plywood was taken, and the plywood bonding structure was excited by ultraviolet light using 365 nm ultraviolet light. The system collects three optical characteristic parameters: the luminous color, lifespan characteristics, and the configuration and combination of luminous areas of the selected plywood bonding structure. The collected results are matched with a pre-set information database; The matching result shows that the phosphorescence afterglow emission color, lifetime characteristics, and configuration of the luminescent area collected after the unknown sample was excited by 365 nm ultraviolet light are consistent with the 9-layer plywood product produced by Company C, and it is determined to be a product of Company C.

Claims

1. A method for identifying engineered wood panels based on ultra-long room temperature phosphorescence afterglow of adhesives, characterized in that, The process includes the following steps: Step 1, exciting the bonded structure of the engineered wood panel with phosphorescent afterglow characteristics with ultraviolet light; Step 2, collecting at least two of the optical characteristic parameters of the bonded structure with phosphorescent afterglow characteristics, including emission color, emission intensity, emission spectrum, delayed emission image, phosphorescence lifetime, and configuration combination of emission areas; Step 3, matching the collected results with a preset information database; Step 4, completing the identification based on the matching results.

2. The method for identifying engineered wood panels based on ultra-long room temperature phosphorescence afterglow of adhesives according to claim 1, characterized in that, The engineered wood products with phosphorescent afterglow properties mentioned in step 1 are laminated veneer lumber, plywood, fine particleboard, particleboard, oriented strand board, MDF, finger-jointed board, blockboard, and their decorative products prepared using adhesives that produce phosphorescent afterglow upon UV irradiation after curing. The adhesives that produce phosphorescent afterglow upon UV irradiation can be used throughout the engineered wood products or applied in sections of the engineered wood product structure in combination with adhesives that do not produce phosphorescent afterglow upon curing.

3. The method for identifying engineered wood panels based on ultra-long room temperature phosphorescence afterglow of adhesives according to claim 1, characterized in that, The photoexcitation conditions described in step 1 are ultraviolet light irradiation in the wavelength range of 250–400 nm.

4. The method for identifying engineered wood panels based on ultra-long room temperature phosphorescence afterglow of adhesives according to claim 1, characterized in that, The data acquisition in step 2 is carried out through one or more combinations of ultraviolet lamps, spectrometers, imaging equipment, time-resolved lifetime testing devices, and time-gated imaging devices.

5. The method for identifying engineered wood panels based on ultra-long room temperature phosphorescence afterglow of adhesives according to claim 4, characterized in that, The delayed emission image described in step 2 is obtained by time-gated acquisition, with the acquisition time set within the range of 0.1 s to 60 s after the excitation light is turned off.

6. The method for identifying engineered wood panels based on ultra-long room temperature phosphorescence afterglow of adhesives according to claim 1, characterized in that, The preset information database mentioned in step 3 is constructed by collecting information on the emission color, emission intensity, emission spectrum, delayed emission image, phosphorescence lifetime characteristics, and configuration of luminescent areas from standard samples of artificial boards with known manufacturers, raw material types, batches, performance levels, or other characteristic indicators under the same or comparable test conditions.

7. The method for identifying engineered wood panels based on ultra-long room temperature phosphorescence afterglow of adhesives according to claim 1, characterized in that, The matching in step 3 is based on the combination of at least two optical feature parameters; the optical feature parameters are selected from at least two of the following combinations: emission color, emission intensity, emission spectrum, delayed emission image, phosphorescence lifetime, and emission region configuration.

8. The method for identifying engineered wood panels based on ultra-long room temperature phosphorescence afterglow of adhesives according to claim 1, characterized in that, In step 4, when at least two optical feature parameters of the sample to be tested correspond to the parameters in the preset information database, it is determined that the sample to be tested matches the corresponding sample information.

9. The method for identifying engineered wood panels based on ultra-long room temperature phosphorescence afterglow of adhesives according to claim 1, characterized in that, The identification result in step 4 is the manufacturer, raw materials, batch, or authenticity of the artificial board.

10. The identification method according to claim 1, characterized in that, The identification process is a non-destructive detection process.