A tearable cover with printed aluminum foil

Abstract

The utility model relates to food packaging technical field discloses an easy-to-tear cover with printed aluminum foil, comprising metal cover ring and composite aluminum foil cover surface, the composite aluminum foil cover surface is fixedly connected with the inner wall of cover ring through the corrosion -resistant adhesive layer, and the cover surface is printed with printed pattern and integrative extension forms the pull tongue, the cover ring is made of tinplate or aluminum alloy and is treated by passivation coating, and the edge is equipped with sealed hem structure, accurate positioning scheme: setting optical contrast positioning mark in aluminum foil raw material belt, and the punch -cutting position is detected in real time and is dynamically compensated through the sensor, realizes pattern accuracy, double -station punch -cutting system synchronous operation improves efficiency, long -term anticorrosion design: cover ring adopts epoxy resin base composite passivation layer full coverage, and the hem structure composite sealant fills, resists strong acid environment and sealed leakage rate, man -machine optimization structure: aluminum foil cover surface integrative pull tongue design, and the prefabricated micro -indentation tear line makes the opening force to drop to 3~5N.

Description

Technical Field

[0001] This utility model relates to the field of food packaging technology, and in particular to an easy-tear cap with printed aluminum foil. Background Technology

[0002] Metal easy-tear caps are mainly composed of tinplate or aluminum alloy cap rings and aluminum foil covers. They offer advantages such as easy tearing, safe opening, lightweight design, and a simple and aesthetically pleasing appearance. The aluminum foil on easy-tear caps is usually unprinted, so the cutting accuracy of the aluminum foil strip is not critical; it only needs to be cut once after each step of a certain distance. However, this method is not suitable for aluminum foil strips with printed patterns. Firstly, the initial position adjustment of the aluminum foil strip upon initial feeding requires repeated confirmation to ensure positional accuracy, consuming a significant amount of time. Secondly, the stepping method using set distances can easily lead to cumulative errors, causing the pattern to become increasingly misaligned, affecting the positional accuracy of the printed pattern. Utility Model Content

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides an easy-tear cover with printed aluminum foil, which solves the technical problem that the stepping method with a set distance can easily generate cumulative errors, causing the position of the pattern to become increasingly off-center and affecting the positional accuracy of the printed pattern.

[0004] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: An easy-tear cap with printed aluminum foil includes a metal cap ring and a composite aluminum foil cap surface. The composite aluminum foil cap surface is fixed to the inner wall of the cap ring by a corrosion-resistant adhesive layer. The cap surface is printed with a pattern and extends integrally to form a pull tab. The cap ring is made of tinplate or aluminum alloy with a passivation coating and has a sealing rolled edge structure.

[0005] Preferably, the raw material strip of the composite aluminum foil cover is provided with a positioning mark. The relative position of the mark and the printed pattern is fixed, and the color of the mark forms an optical contrast with the background color of the aluminum foil. The positioning system includes at least one optical sensor for real-time detection of the spatial coordinates of the positioning mark on the raw material strip and feedback to the displacement compensation module of the punching die. A dual-station punching system is adopted, including a first set of punching dies and a second set of punching dies arranged in parallel. Each set of dies corresponds to an independent first optical sensor and a second optical sensor to realize synchronous positioning and cutting of the raw material strip.

[0006] Preferably, the positional accuracy of the printed pattern is controlled within ±0.1mm, a micro-indentation tear line is pre-made at the connection between the pull tab and the cover, and the passivation coating is an epoxy resin-based composite coating with a thickness of 8-12μm, covering the inner and outer surfaces of the cover ring and the rolled edge seam.

[0007] (III) Beneficial Effects Zero cumulative error positioning: By using positioning markers and real-time coordinate feedback from optical sensors, the punching position is dynamically corrected, eliminating mechanical transmission errors, and the pattern positioning accuracy reaches ±0.1mm; No manual calibration is required when changing the conveyor belt, reducing the changeover time by more than 60%.

[0008] Dual-station high-efficiency production: Dual punching dies, combined with independent sensors, operate synchronously, increasing production capacity by 100%, and cross-verification prevents material from deviating.

[0009] Long-lasting corrosion-resistant seal: The epoxy resin-based passivation coating provides full coverage, making it resistant to acidic environments with a pH of 2.5-7.0, and its salt spray test life exceeds 500 hours. The rolled edge structure and adhesive layer form a triple sealing barrier, with a leakage rate of less than 0.01%.

[0010] User operation optimization: The micro-indentation tear line reduces the opening force to 3-5N, allowing elderly users to operate with one hand. Attached Figure Description

[0011] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0012] Figure 1 This is a structural view of the front of the easy-tear cap of this utility model; Figure 2 This is a layout diagram of the aluminum foil strip and a schematic diagram of the punching position and sensor position of this utility model.

[0013] Illustrations: 1. Metal cap ring; 11. Rolled edge structure; 2. Composite aluminum foil cover; 20. Raw material strip; 201. Positioning mark; 21. Printed pattern; 22. Pull tab; 221. Micro-indentation tear line; 3. Adhesive layer; 4. Optical sensor; 5. Punching die. Detailed Implementation

[0014] like Figure 1 and Figure 2 As shown, the overall concept of the technical solution in this application embodiment is as follows: To address the problems existing in the prior art, this utility model provides an easy-tear cap with printed aluminum foil, including a metal cap ring 1 and a composite aluminum foil cap surface 2. The composite aluminum foil cap surface 2 is fixed to the inner wall of the cap ring through a corrosion-resistant adhesive layer 3. The cap surface is printed with a printed pattern 21 and extends integrally to form a pull tab 22. The cap ring is made of tinplate or aluminum alloy with a passivation coating treatment, and its edge is provided with a sealing rolled edge structure 11.

[0015] The raw material strip 20 of the composite aluminum foil cover 2 is provided with a positioning mark 201. The relative position of the mark and the printed pattern 21 is fixed, and the color of the mark forms an optical contrast with the background color of the aluminum foil. The positioning system includes at least one optical sensor 4, which is used to detect the spatial coordinates of the positioning mark 201 on the raw material strip 20 in real time and feed it back to the displacement compensation module of the punching die 5. A dual-station punching system is adopted, including a first set of punching dies 5a and a second set of punching dies 5b arranged in parallel. Each set of dies corresponds to an independent first optical sensor 4a and a second optical sensor 4b, so as to realize the synchronous positioning and cutting of the raw material strip 20.

[0016] The positional accuracy of the printed pattern 21 is controlled within ±0.1mm. A micro-indentation tear line 221 is pre-made at the connection between the pull tab 22 and the cover. The passivation coating is an epoxy resin-based composite coating with a thickness of 8-12μm, covering the inner and outer surfaces of the cover ring and the rolled edge seam.

[0017] Working principle: The easy-tear lid includes a metal cap ring 1 and a composite aluminum foil cap 2. The cap is printed with a pattern 21 and extends integrally to form a pull tab 22. The positional accuracy of the pattern can reach ±0.1mm. The raw material belt 20 enters the punching station, and the optical sensor 4 scans the coordinates of the positioning mark 201. The control system compares the marked coordinates with the theoretical coordinates of the preset punching point and calculates the displacement deviation value. The drive module adjusts the feed rate of the raw material belt 20 in real time so that the positioning mark 201 reaches the theoretical coordinate point; The punching die 5 completes the stamping of the cover at a zero-error position.

[0018] Dual-station collaborative mechanism: When sensor 4a detects the upper row of markings, mold 5a performs punching; simultaneously, sensor 4b monitors the position of the lower row of markings, and the dual-channel data interlock ensures that the conveyor belt does not deviate.

[0019] Example 1: Manufacturing of the cover Pre-treatment of cover ring: The tinplate cap ring is degreased with alkaline solution, cleaned with pure water, and then dipped in passivation solution to coat with epoxy resin / chromate composite solution. It is then cured at 220℃ to form a 12μm coating. The rolled edge structure 11 adopts a three-layer roll sealing process and is pre-filled with food-grade sealant.

[0020] Aluminum foil cover preparation: A red circular positioning mark 201 is printed on the edge of the aluminum foil raw material strip 20, with the center of the mark being a constant 5mm from the reference point of the pattern. The pattern 21 is printed using UV ink, with a precision error of ≤0.08mm.

[0021] Composite assembly: Heat the cap ring coated with corrosion-resistant hot melt adhesive ethylene-acrylic acid copolymer to 160°C; The aluminum foil cover 2, after being punched, is positioned by air pressure adsorption and then pressed and cured to form an adhesive layer 3.

[0022] Example 2: Positioning and punching system Equipment configuration: Raw material strip 20 unwinding machine → high-precision servo feeding mechanism → 2 sets of fiber optic sensors 4a, 4b → double-head punch press station spacing 300mm; Work mode: Sensors 4a and 4b scan the positioning mark 201 at a frequency of 500 times / second with a resolution of 0.02mm; When a deviation is detected, the servo motor completes the feeding compensation within 0.1 seconds, and the punching frequency reaches 120 times / minute.

[0023] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An easy-tear cap with printed aluminum foil, characterized in that: It includes a metal cover ring (1) and a composite aluminum foil cover (2). The composite aluminum foil cover (2) is fixed to the inner wall of the cover ring through a corrosion-resistant adhesive layer (3). The cover is printed with a pattern (21) and extends integrally to form a pull tab (22). The cover ring is made of tinplate or aluminum alloy with a passivation coating and has a sealing rolled edge structure (11) on its edge. The composite aluminum foil cover (2) has a positioning mark (201) on the raw material strip (20), which is fixed in relative position to the printed pattern (21), and the color of the mark forms an optical contrast with the background color of the aluminum foil; The positioning system includes at least one optical sensor (4) for real-time detection of the spatial coordinates of the positioning mark (201) on the raw material strip (20) and feedback to the displacement compensation module of the punching die (5).

2. The easy-tear cap with printed aluminum foil as described in claim 1, characterized in that: A dual-station punching system is adopted, including a first set of punching dies (5a) and a second set of punching dies (5b) arranged in parallel. Each set of dies corresponds to an independent first optical sensor (4a) and a second optical sensor (4b) to realize the synchronous positioning and cutting of the raw material strip (20).

3. The easy-tear cap with printed aluminum foil as described in claim 1, characterized in that: The positional accuracy of the printed pattern (21) is controlled within ±0.1mm, and a micro-indentation tear line (221) is pre-made at the connection between the pull tab (22) and the cover.

4. The easy-tear cap with printed aluminum foil as described in claim 1, characterized in that: The passivation coating is an epoxy resin-based composite coating with a thickness of 8-12 μm, covering the inner and outer surfaces of the cover ring and the rolled edge seam.

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