Combined Creasing and Slitting Tool for Paperboard
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Solution Overview
Problem
Existing tools for embossing and cutting foldable materials, such as cardboard and plastic films, face challenges in maintaining consistent quality due to variations in material thickness and basis weight, leading to issues like cracks and flaking, especially when processing materials with high specific weight per unit area.
Innovation Solution
A combined embossing and scoring/cutting tool with a base body composed of two symmetric tool halves, featuring a blunt embossing edge and parallel cutting edges, which distributes forces more evenly and allows for improved curvature behavior, reducing compressive and tensile stresses, and enabling simultaneous scoring and cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the embossing edge is made narrow and thin to press sufficiently into thin materials, then the embossing effectiveness is improved, but the risk of material damage such as cracking increases
Solution Approach 1:
The base body is divided into a head region with embossing function and a blade region with cutting function. The head region is further segmented into two symmetric tool halves that can be independently adjusted. This segmentation allows the embossing edge to be optimized for pressing effectiveness while the separate cutting edges handle material separation, preventing the embossing edge from needing to be both thin (for effectiveness) and thick (for durability).
Solution Approach 2:
Different regions of the tool are given different properties: the head region has embossing edges designed for thin materials with appropriate narrowness and thickness, while the blade region has cutting edges for material separation. The two symmetric tool halves allow local adjustment of embossing edge geometry to match specific material requirements without compromising the overall tool structure.
2Ease of operation
If the embossing edge is made wide for thicker and softer materials to achieve good foldability, then the foldability is improved, but the compressive stresses and tensile stresses increase considerably
Solution Approach 1:
The tool separates the embossing function (head region) from the cutting function (blade region). The two symmetric tool halves can be adjusted independently to optimize the embossing edge width for the specific material thickness, while the subsequent cutting action by the blade region relieves the stresses that would otherwise accumulate in the embossed material.
Solution Approach 2:
The embossing edge first creates the fold line by pressing into the material, and then the cutting edges subsequently score or cut the material along the fold line. This preliminary embossing followed by cutting allows the material to be folded more easily while the cutting action prevents excessive stress accumulation that would occur if only wide embossing were used.
3Manufacturing precision
If the creasing tool is precisely matched to the material geometry, then the embossing quality is improved, but cracks or chips may occur when material quality fluctuates due to recycled materials
Solution Approach 1:
The two symmetric tool halves can be adjusted independently to adapt to variations in material properties. This dynamic adjustability allows the tool to maintain optimal embossing quality even when material thickness or density fluctuates due to the use of recycled materials, preventing cracks and chips that would occur with a fixed, precisely-matched tool geometry.
Solution Approach 2:
The tool allows changing of geometric parameters (such as embossing edge width, thickness, and cutting edge position) to match the specific material being processed. When material quality fluctuates, the parameters of the two symmetric tool halves can be adjusted to compensate for these variations, maintaining reliable embossing and cutting performance across different material batches.
4Object-affected harmful factors
If a die strip is used for thin and hard materials to prevent damage, then the material damage is reduced, but very precise alignment of the die strip in relation to the embossing edge is required
Solution Approach 1:
The invention merges the embossing function and the cutting function into a single integrated tool body. The two symmetric tool halves are connected to form one piece, eliminating the need for separate die strips that would require precise alignment. The cutting edges are positioned relative to the embossing edges within the same tool structure, ensuring proper alignment without requiring additional alignment procedures.
Data Source
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AI summary
The present invention relates to a combined stamping- and scribing/cutting tool (1) for stamping linear fold grooves and for scoring foldable materials such as paperboard, paperboard containers, luxury paperboard containers, plastic films or corrugated board, the tool consisting of a planar, strip-type base body (2), said base body (2) having a head region (3) in which a blunt embossing edge (6) for producing a fold groove in the material and a projection (7) comprising a cutting edge (8) for producing a cut- or scribed line in the material are formed on a longitudinal edge. The base body (2) has a blade region (4) comprising a foot region (5), in which a base (9) that sits in a tool carrier (WT) is formed on a longitudinal edge lying opposite the head region (3). In order to improve the quality of the fold grooves produced, according to the invention the head region (3) of the base body (2) is wider than its blade region (4) and two cutting projections (7) with parallel cutting edges (8), between which the blunt embossing edge (6) runs, are provided in the head region (3).