In-Mold Deformation of Planar Flexible Labels on Curved Containers
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Solution Overview
Problem
Existing label attaching processes for three-dimensional curved surfaces are complex, costly, and result in instability and frequent wrinkling or detachment, failing to provide effective wear-resistant and protective functions.
Innovation Solution
An in-mold labeling process involving a flexible planar label made from materials like TPE, EVA, or PU, punched to a preset shape, then molded within a cavity to conform to the container's inner wall, ensuring adhesion and maintaining a flush outer contour.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a three-dimensional shaped label is used to adapt to the curved surface, then the label can conform to the container shape, but the manufacturing process becomes complex and costly
Solution Approach 1:
The label is divided into a planar base material and a separate flexible material layer. The planar base material is punched out according to the unfolded shape of the container surface, and the flexible material is applied separately to conform to the curved surface. This segmentation allows simple planar manufacturing while achieving three-dimensional conformity.
Solution Approach 2:
The patent transitions from three-dimensional label manufacturing to two-dimensional planar label manufacturing. By unfolding the three-dimensional container surface into a two-dimensional planar pattern, the label can be manufactured using simple planar processes and then applied to conform to the three-dimensional surface, reducing manufacturing complexity.
2Reliability
If traditional label attaching methods are used on curved surfaces, then the label can be attached, but the adhesion is unstable and the label wrinkles or falls off
Solution Approach 1:
The patent uses a flexible material layer (such as rubber or elastomer) that can elastically deform to conform to the curved container surface. This flexible film maintains stable adhesion by stretching and contracting with the container surface, preventing wrinkling and detachment while accommodating surface curvature.
Solution Approach 2:
The label consists of a composite structure combining a planar base material (for structural support) and a flexible material layer (for adhesion and conformity). This composite construction provides both the structural integrity needed for attachment and the flexibility needed to conform to curved surfaces without wrinkling.
3Manufacturing precision
If multiple steps of 3D modeling, molding and clipping are used, then the label can be shaped correctly, but the production efficiency is low
Solution Approach 1:
The planar base material is pre-punched out according to the unfolded shape of the container surface before application. This preliminary shaping action eliminates the need for complex 3D modeling and multiple molding steps during production, as the label is already shaped to match the container geometry when applied.
Solution Approach 2:
The patent uses a two-dimensional unfolded pattern that copies the three-dimensional container surface geometry. By creating a planar development or unfolding of the container surface, the label can be manufactured using simple planar processes while maintaining accurate geometric correspondence with the three-dimensional surface.
4Measurement precision
If accurate operation and adjustment are required for each step, then the label can be positioned correctly, but time is consumed and production bottlenecks occur
Solution Approach 1:
The patent combines the label application step with the container forming step into a single integrated process. The flexible material layer is applied to the planar base material and then both are simultaneously formed in the mold, eliminating the need for separate positioning and adjustment steps, thereby reducing production time while maintaining positioning accuracy.
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
Simplifies production, reduces costs, and ensures stable adhesion, preventing wrinkling and detachment, while providing enhanced decorative and protective functions.
Implementation Method 1
air pressure, during molding, causes the flexible planar label to be kept at a pre-labeling position and deform along with an inner wall of the cavity to maintain adhesion
Implementation Method 2
the flexible planar label is converted into a flexible three-dimensional label... the flexible planar label to be kept at a pre-labeling position and deform along with an inner wall of the cavity
Data Source
AI summary
An in-mold labeling process attaches a planar flexible label to a three-dimensional curved surface of a container. The planar label is punched from a planar flexible base material according to a preset shape, which is a planar shape formed by unfolding the three-dimensional face of the container. During molding, air pressure keeps the planar label at a pre-labeling position and deforms the label along an inner wall of a cavity to maintain adhesion, so that the planar label is converted into a three-dimensional label. Based on the characteristics of the flexible material, the label deforms along the inner wall of the cavity while maintaining the outer contour of the label flush with the periphery of the pre-labeling position. The process allows the label and container to be integrally molded, ensuring the stability of adhesion and providing better wear resistance and protection.