Tunnel Drying Line for High-Throughput Pulp Containers

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Solution Overview

Problem

Pulp containers require a long drying time before they can be transported and filled, and conventional drying methods are complex, making it impractical to achieve high production capacities in a closed-loop filling process.

Innovation Solution

A container treatment system comprising a tunnel dryer connected to a conveyor apparatus for continuous production, drying, and filling of pulp containers, utilizing various heating methods and waste heat recovery to enhance drying efficiency and capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional drying modules are used for each pulp container, then drying can be achieved, but the system complexity increases significantly and production capacity is limited

Engineering Contradiction:
Improveproduction capacityVSAvoiddrying system complexity
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The patent combines multiple drying modules into a single tunnel dryer structure where numerous pulp containers are dried simultaneously in a continuous flow. This merging approach achieves high production capacity (over 10,000 containers per hour) without requiring a very large number of separate drying modules for each container, thus resolving the contradiction between productivity and device complexity.

Inventive Principle:
Principle #5Merging (Combining)

2Productivity

If pulp containers are dried separately in individual modules, then drying is effective, but the number of modules required becomes impractically large

Engineering Contradiction:
Improvecontainers per hourVSAvoidnumber of drying modules
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The tunnel dryer operates continuously with pulp containers moving through the drying zone in an uninterrupted flow. This continuous action allows a single tunnel dryer to perform the work of many discrete drying modules, achieving high productivity (over 10,000 containers per hour) without requiring an impractically large number of separate modules.

Inventive Principle:
Principle #20Continuity of useful action

3Productivity

If a closed-loop filling process is implemented, then efficiency improves, but it becomes impossible without external container delivery due to drying bottlenecks

Engineering Contradiction:
Improvesystem capacityVSAvoidclosed-loop process feasibility
Core Design Contradiction:
ProductivityVSEase of operation

Solution Approach 1:

The tunnel dryer fundamentally changes the drying parameter from discrete, time-consuming individual drying to continuous, high-volume drying. This parameter change eliminates the drying bottleneck that previously prevented closed-loop filling processes, enabling system capacities of over 10,000 containers per hour and making closed-loop operation feasible without external container delivery.

Inventive Principle:
Principle #35Parameter changes

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 system allows for the production and filling of over 10,000 containers per hour, integrating drying, filling, and other processes in a single continuous process, reducing drying time and eliminating bottlenecks.

Implementation Method 1

a tunnel dryer for drying the pulp containers

Methodology Applied
Scientific EffectEvaporation: Evaporation

Implementation Method 2

utilizing various heating methods and waste heat recovery to enhance drying efficiency

Methodology Applied
Scientific EffectHeating: Heating

Implementation Method 3

waste heat recovery to enhance drying efficiency

Methodology Applied
Scientific EffectHeat exchange: Heat Exchanger

Data Source

PatentUS20260035866A1Container treatment system for pulp containers
Publication Date: 2026.02.05 KRONES AG
  • US20260035866A1 patent drawing
  • US20260035866A1 patent drawing
  • US20260035866A1 patent drawing

AI summary

The invention relates to, inter alia, a container treatment system having a container producing apparatus for producing pulp containers from pulp, a tunnel dryer for drying the pulp containers, and a conveyor apparatus which connects the container producing apparatus to the tunnel dryer for transporting the pulp containers from the container producing apparatus to the tunnel dryer. Advantageously, the container treatment system allows a very large number of pulp containers to be produced and dried for a subsequent filling process because the drying process no longer acts as a bottleneck during the treatment process.