Sleeve Label Sealing Position Control
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Solution Overview
Problem
Current sleeve-like labels suffer from defects such as free flaps and ridges due to inconsistent sealing, leading to aesthetic issues and potential damage during the heat-shrinking process, as the sealing portion is often positioned incorrectly due to manufacturing tolerances.
Innovation Solution
A device and method that includes a feeder for heat-shrink film, detection of the angular position of the film's free edge, and relative movement to precisely position the sealing means at a preset distance from the free edge, ensuring consistent and optimal sealing during the formation of sleeve-like labels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sealing is performed at an intermediate position due to manufacturing tolerances, then the sealing operation can be completed, but the sealing position becomes inconsistent leading to free flaps and ridges
Solution Approach 1:
The patent applies preliminary action by pre-positioning reference marks on the film before sealing. These reference marks are placed at predetermined positions during film preparation, allowing the sealing mechanism to locate and seal at the correct position without relying on intermediate adjustments during the sealing process itself
Solution Approach 2:
The patent implements feedback by using detection means (such as optical sensors or markers) to detect the actual position of the film edge or reference marks, then using this detected information to adjust the sealing position dynamically. This closed-loop feedback ensures that sealing always occurs at the predetermined optimal position regardless of manufacturing tolerances in previous steps
2Ease of manufacture
If the sealing portion is positioned at the edges of the overlap region, then sealing can be executed, but defects such as free flaps and ridges occur during heat-shrinking
Solution Approach 1:
The patent pre-determines the optimal sealing position within the overlap region and marks this position in advance. By calculating and pre-setting the correct sealing location that accounts for heat-shrinking behavior, the system ensures sealing occurs at the most reliable position before the actual sealing operation, preventing free flaps and ridges
Solution Approach 2:
The patent replaces purely mechanical positioning systems with a combination of optical detection, electronic control, and programmable positioning. Instead of relying on mechanical tolerances alone, the system uses sensors to detect film position and electronically adjusts the sealing mechanism to maintain precise positioning, thereby eliminating defects
3Manufacturing precision
If detection means and relative movement means are added to achieve precise sealing positioning, then sealing consistency is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by designing a system where the film itself provides positioning information through pre-printed reference marks or natural edge features. The detection means reads these existing features on the film, and the system automatically compensates for position variations without requiring external intervention or complex manual adjustment mechanisms
Solution Approach 2:
The patent makes the detection and positioning system multi-functional by using the same reference marks and detection mechanisms for multiple purposes: positioning the film, determining sealing location, and potentially guiding subsequent operations like cutting or labeling. This universal approach reduces the need for separate dedicated components for each function
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures homogeneous and long-lasting adhesion of sleeve-like labels to containers, eliminating protrusions and tabs that can be caught or damaged, thereby enhancing the aesthetic quality and durability of the packaging.
Implementation Method 1
means for detecting the angular position of the free edge of the second longitudinal end of said portion of film wrapped around said forming spindle with respect to an absolute reference system that is jointly connected to the forming spindle
Implementation Method 2
sealing means which are arranged in order to make the portion of plastic film adhere to and wind around the cylindrical wall
Implementation Method 3
At the overlap region, the join is normally executed by using suitable sealing techniques so as to obtain a sleeve-like label
Implementation Method 4
the label is subjected to a heat treatment that is such as to cause its shrinkage owing to a thermal effect and, therefore, the close adhesion to the lateral surface of the respective container
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A device (1) for producing a sleeve-like label (2), comprising at least one feeder, designed to feed to at least one forming spindle (4) a portion of heat-shrink film (5), and means (7) for wrapping the portion of heat-shrink film (5) around the lateral surface (4a) of the forming spindle (4), the wrapping means (7) being designed to provide a region of overlap (8) between a first longitudinal end (5 a) of the portion of heat-shrink film (5) in contact with the forming spindle (4) and the second longitudinal end (5b) of the portion of heat-shrink film (5); the device (1) comprises, furthermore, means (30) for detecting the angular position of the free edge (5c) of the second longitudinal end (5b) of the portion of film (5) wrapped around the forming spindle (4) with respect to an absolute reference system that is jointly connected to the forming spindle (4), means (31) being provided for the relative movement of the overlap region (8) with respect to a region affected by the action of sealing means (11) which are adapted to form a connecting portion (13) at the overlap region (8); the relative movement means (31) being, in particular, adapted to move the free edge (5c) detected by the detection means (30) to a preset position in order to provide the connecting portion (13) at a preset distance with respect to the free edge (5c), means (9) being further provided for transferring the sleeve-like label (2) from the forming spindle (4) to a container (10) to be labelled.