Slot Nozzle Flow Channel Design for Uniform Adhesive Discharge
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Solution Overview
Problem
Existing adhesive application devices for book spines, particularly those using slot nozzles, suffer from structural complexity, adhesive aging due to cavities with little or no flow, and non-uniform discharge, which affects the quality and efficiency of adhesive application across varying book block thicknesses.
Innovation Solution
A device with a flow channel and nozzle slot design where the longitudinal extent of the flow channel is at least as great as the nozzle slot, ensuring uniform discharge and even distribution of adhesive, and a blocking mechanism to prevent adhesive flow when not in use, minimizing cavities and adhesive loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a slot nozzle with adjustable slide is used to adapt to different book block thicknesses, then the adaptability of the device is improved, but the structural complexity increases
Solution Approach 1:
The patent implements a movable slide that can be adjusted along the longitudinal extent of the nozzle slot to vary the outlet opening width. This dynamic adjustment mechanism allows the device to adapt to different book block thicknesses while maintaining a relatively simple nozzle body structure. The slide is actuated by a drive mechanism that enables precise positioning without requiring complex internal nozzle geometry changes.
2Manufacturing precision
If the nozzle slot is sealed by a slider for narrower book spines, then the manufacturing precision of adhesive application is improved, but cavities with little or no flow are formed causing adhesive aging
Solution Approach 1:
The patent designs the flow channel with a longitudinal extent that is at least as great as the nozzle slot, ensuring continuous adhesive flow from the inlet opening through the entire length of the flow channel to the nozzle slot. This continuous flow path prevents the formation of stagnant cavities where adhesive could age or harden, while the slide sealing mechanism maintains precise control over the outlet opening for narrow book spines.
Solution Approach 2:
The patent creates different flow conditions in different regions of the nozzle. The flow channel is designed with varying cross-sectional area along its length to ensure adequate flow velocity throughout, while the nozzle slot region allows for localized sealing by the slide. This local differentiation enables precise adhesive application control without creating stagnant zones in the flow channel.
3Manufacturing precision
If the cross-sectional area of the flow channel is reduced, then the adhesive discharge uniformity is improved, but the risk of adhesive hardening in the flow channel increases
Solution Approach 1:
The patent varies the cross-sectional area of the flow channel along its longitudinal extent to optimize adhesive flow characteristics. By carefully designing the cross-sectional area profile, the patent achieves uniform adhesive discharge through the nozzle slot while maintaining sufficient flow velocity throughout the channel to prevent adhesive hardening. The cross-sectional area is adjusted as a continuous parameter rather than a fixed value.
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 solution ensures consistent and efficient adhesive application across different book block thicknesses, preventing adhesive aging and maintaining quality throughout the adjustment range, with a simplified structure that reduces maintenance and cleaning efforts.
Implementation Method 1
the cross-sectional area of the flow channel varies continuously along its length in the region of the nozzle slot... ensuring uniform discharge and even distribution of adhesive
Data Source
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AI summary
The invention relates to a device (1) for applying a free-flowing substance, in particular a free-flowing adhesive, to at least one substrate (3), with an application nozzle (10) designed as a slot nozzle, which has a stationary nozzle body (36) with an inlet opening (37), a flow channel (38) and a nozzle slot (39), wherein when the free-flowing substance is conveyed through the application nozzle (10), the free-flowing substance passes from the inlet opening (37) into the flow channel (38) and from there to the nozzle slot (39) and is discharged through an outlet opening (40) of the nozzle slot (39), wherein the outlet opening (40) is arranged in an outer region of the nozzle body (36), wherein the application nozzle (10) further comprises a slide (26) which is movable relative to the nozzle body (36) in the longitudinal extension of the outlet opening over the latter by means of an actuating means (25) and contacts the outer region.for variable covering of the outlet opening (40). In such a device, the longitudinal extent (LS) of the flow channel (38) is at least as large as the longitudinal extent (LD) of the nozzle slot (39), wherein the inlet opening (37) is operatively connected to the flow channel (38) in the region of one end (41) and the other end (42) of the flow channel (38) terminates in the region of one end (43) of the nozzle slot (39), and the outlet opening (40) can be vented by means of the slide (26) starting from the other end (44) of the nozzle slot (39), wherein the cross-sectional area of the flow channel (38) decreases continuously from one end (41) to the other end (42) of the flow channel (38), and the width of the nozzle slot (39) is constant along its length or increases continuously from the other end (44) to one end (43).the depth of the nozzle slot (39) is constant over its length or decreases continuously from the other end (44) to one end (43), whereby the width and the depth of the nozzle slot are not simultaneously constant.