Arcuate Hot Plates for Corrugated Board Heating

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Solution Overview

Problem

The existing corrugated board production lines face inefficiencies due to long heating devices, resulting in low production speed and unsatisfactory productivity, as well as significant temperature loss of corrugated board layers before reaching the two-sided machine.

Innovation Solution

A heating device with two upstream arcuate hot plates is implemented, where the second arcuate hot plate is connected to a sleeve via a connecting shaft, forming a rotational pair, allowing for direct heat transfer to the glue and corrugated board layers, optimizing bonding and reducing temperature loss by minimizing the unheated length of the corrugated board.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a long heating element is used to heat the corrugated board, then the glue has sufficient bonding strength, but the production speed is reduced and productivity is unsatisfactory

Engineering Contradiction:

Improvebonding strengthVSAvoidproduction speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The heating device is segmented into two separate arcuate hot plates positioned upstream of the two-sided machine, rather than using one long heating element. This segmentation allows for more efficient heat distribution and reduces the total heating path length, thereby improving production speed while maintaining bonding quality through optimized local heating zones.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The arcuate hot plates perform preliminary heating of the corrugated board layers before they enter the two-sided machine. By pre-heating the boards upstream, the actual bonding process in the two-sided machine is shortened, reducing the time required for sufficient bonding while maintaining bonding strength, thus improving overall production speed.

Inventive Principle:

Principle #10Preliminary action

2Temperature

If a long heating element is used, then the corrugated board is adequately heated, but the entire setup is space-consuming

Engineering Contradiction:

Improveheating effectivenessVSAvoidheating device length

Core Design Contradiction:

TemperatureVSLength of stationary object

Solution Approach 1:

The heating device uses arcuate (curved) hot plates instead of straight linear heating elements. This curvature allows the heating surfaces to be compactly arranged in an arc configuration, reducing the linear footprint of the heating device while maintaining adequate heating coverage and effectiveness for the corrugated board layers.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Temperature

If the corrugated board passes through a long heating element, then sufficient heat is transferred, but temperature loss occurs before reaching the two-sided machine

Engineering Contradiction:

Improveheat transferVSAvoidtemperature loss

Core Design Contradiction:

TemperatureVSLoss of energy

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

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

This configuration enhances production speed and productivity by ensuring optimal bonding of corrugated board layers with minimal temperature loss, resulting in high-quality multi-ply corrugated boards and simplifies the heating device arrangement.

Implementation Method 1

the adhesive bonding the corrugated board layers is heated, but remains unaffected and is not damaged. During operation, the corrugated board layers slide along the hot plates, at least in certain areas, and are thereby heated.

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentEP3285996B1Heating device, comprising two preceding arcuate hot plates, of a two-sided machine

Publication Date: 2020.07.01 BHS CORRUGATED MACHINEN UND ANLANGENBAU GMBH

Figure 1~2
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Figure 4

AI summary

A heating device of a two-sided machine (9) has a frame (1) that has a first arcuate hot plate (2) and a wall (3) on which there is provided a sleeve (4). A second arcuate hot plate (5) is arranged above the first arcuate hot plate (2), the second arcuate hot plate (5) being connected to the sleeve (4) via a connection shaft. The frame (1) comprises a cylinder unit (6) whose piston rod is connected to the rear end of the second arcuate hot plate (5). A second corrugated fiberboard layer (11) and a first corrugated fiberboard layer (12) are guided so as to run between the hot plates (5, 2), while a third corrugated fiberboard layer (10) is guided so as to run above the second arcuate hot plate (5), through the second arcuate hot plate (5). The second arcuate hot plate (5) is lowered by the cylinder unit (6) so as to be in contact with the second corrugated fiberboard layer (11).