Embossing Group Sleeve Multi-Roller Nip
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Solution Overview
Problem
Existing embossing and laminating machines face challenges in achieving high-quality embossing due to limited pressure pulse, which is hindered by the small nip time caused by high production speeds, and are cumbersome due to large roller sizes, making them less accessible and adaptable to different paper types.
Innovation Solution
An embossing group with a sleeve surrounding two idle rollers that increases the nip dimension by adjusting the contact zone between the first steel roller and the sleeve, allowing for higher pressure pulses and improved embossing quality, while maintaining a compact design for easier accessibility and adaptability to various paper types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the machine speed is increased to improve productivity, then production increases, but the nip time decreases leading to reduced embossing quality
Solution Approach 1:
The invention transitions from a traditional single-roller embossing configuration to a multi-roller arrangement where multiple rollers work in parallel. This dimensional change in the embossing group structure allows the system to maintain adequate nip time for quality embossing while the paper sheet moves at high production speeds, effectively decoupling the relationship between machine speed and embossing quality.
Solution Approach 2:
The embossing process is segmented across multiple rollers rather than relying on a single embossing pair. By dividing the embossing function across several rollers working in sequence or parallel, the system can achieve the cumulative embossing effect needed for high quality while maintaining high line speeds, thus resolving the contradiction between productivity and manufacturing precision.
2Manufacturing precision
If larger embossing rollers are used to increase the nip and pressure pulse, then embossing quality improves, but the device footprint increases reducing accessibility
Solution Approach 1:
The invention employs a compact nested arrangement where multiple rollers are positioned in a space-efficient configuration. The rollers are arranged to work in close proximity, with the paper sheet passing through a compact embossing zone. This nesting of multiple functional elements within a small footprint allows large effective nip dimensions for quality embossing without requiring large overall device dimensions, thus maintaining accessibility.
Solution Approach 2:
Instead of increasing roller diameter in one dimension to achieve larger nip, the invention redistributes the embossing function across multiple rollers in a compact multi-dimensional arrangement. This allows the system to achieve the necessary pressure pulse and nip time through coordinated action of multiple smaller rollers rather than one large roller, reducing the overall footprint while maintaining embossing quality.
3Manufacturing precision
If the contact area between rollers is increased to improve pressure pulse, then embossing quality improves, but the device complexity increases
Solution Approach 1:
The invention optimizes the parameters of multiple rollers (diameters, spacing, rotational speeds, and positions) to achieve the desired pressure pulse and contact area distribution. By carefully tuning these parameters across a multi-roller system, the system achieves high embossing quality through coordinated roller interaction rather than relying on a single complex large-contact-area roller, thus managing device complexity through parameter optimization.
Solution Approach 2:
The embossing group employs dynamic coordination between multiple rollers, where the rollers can be independently adjusted and controlled to optimize the pressure distribution and contact timing. This dynamic approach allows the system to achieve high embossing quality through flexible, adjustable roller interactions rather than fixed complex mechanical structures, reducing inherent device complexity while maintaining manufacturing precision.
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 embossing group significantly enhances embossing quality by increasing pressure pulses and nip time, allowing for better paper processing with lower specific pressures and improved accessibility, while maintaining a compact footprint suitable for various paper types and production speeds.
Implementation Method 1
A second roller, i.e. a counter-roller, is also provided which is generally made of rubber, adapted to deform elastically when the protuberances of the first roller penetrate the paper sheet
Implementation Method 2
The embossing group with a sleeve surrounding two idle rollers that increases the nip dimension by adjusting the contact zone between the first steel roller and the sleeve, allowing for higher pressure pulses
Data Source
AI summary
An embossing group includes: a first embossing roller and at least one embossing unit associated with the first roller. The embossing unit includes a second embossing roller, a third embossing roller, and a sleeve surrounding the second roller and the third roller by coupling them. The sleeve faces the first roller and is configured to contact the first roller. The embossing unit and the first roller are configured to emboss at least one paper sheet wound between the first roller and the embossing unit.