Tire Tread Strip Extrusion with Intermittent Conductive Material
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Solution Overview
Problem
Current methods for producing electrically conductive passages in pneumatic vehicle tires are limited by the need for specific materials that ensure the rubber mixture sheet parts hold together reliably, restricting the selection of electrically conductive materials and potentially leading to issues with the raw tread's integrity.
Innovation Solution
The method involves extruding a rubber mixture web with multiple layers, dividing it into sheet parts, and applying electrically conductive material intermittently and discontinuously to the separating surfaces using a slot nozzle, allowing for better adhesion and flexibility in material selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrically conductive material is applied to the dividing surfaces of rubber compound web sections to form electrically conductive passages, then the electrical conductivity of the tread is improved, but the adhesion and integrity of the raw tread strip deteriorates
Solution Approach 1:
The patent applies electrically conductive material locally and selectively to specific dividing surfaces of rubber compound web sections, rather than uniformly to all surfaces. This localized application ensures electrical conductivity where needed while preserving adhesion in areas where material bonding is critical for raw tread strip integrity.
Solution Approach 2:
The patent uses partial action by applying electrically conductive material to only certain dividing surfaces rather than all surfaces. This selective application provides sufficient electrical conductivity to prevent static charge buildup while maintaining adequate adhesion strength through the remaining unbonded surfaces.
2Ease of manufacture
If conventional methods are used to produce electrically conductive passages, then the production process is simplified, but the selection of electrically conductive materials is restricted
Solution Approach 1:
The patent segments the application process by treating different dividing surfaces differently - some surfaces receive electrically conductive material while others remain untreated for optimal adhesion. This segmentation allows independent optimization of electrical conductivity and adhesion properties, enabling broader material selection without compromising overall process simplicity.
Solution Approach 2:
The patent changes the parameter of material application by controlling which dividing surfaces receive electrically conductive material and which do not. This parameter control allows flexibility in material selection while maintaining ease of manufacture through a straightforward, selective application process.
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 approach ensures that the raw tread holds together well, allowing for ideal further processing and providing flexible options for electrically conductive materials, ensuring reliable formation of electrically conductive passages in the tire.
Implementation Method 1
The rubber compound web sections, joined together in step c) to form a raw tread strip, adhere particularly well at the areas of the parting surfaces free of electrically conductive material
Data Source
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Figure 3~5
AI summary
The invention relates to a method for producing a radially single- or multi-layered raw tread strip (1) consisting of at least one rubber compound for a vehicle pneumatic tire, comprising the following steps, which are carried out successively and, in particular, at least partially parallel to one another: a) Extruding a rubber compound web with one or more superimposed layers (2, 3), wherein the respectiveeach layer (2, 3) consists of one or more rubber compound(s), b) transport of the extruded rubber compound web through a pre-template (6) in which the extruded rubber compound web, viewed in cross-section, is divided with respect to its longitudinal extent at at least one slot die (7) into rubber compound web parts, and c) intermittent and discontinuous application of electrically conductive material to the parting surfaces of the rubber compound web parts by means of the slot die(s) (7) and joining of the rubber compound web parts after passing the slot die(s) (7) to form a raw strip (1) which is penetrated by the electrically conductive material at spaced-apart locations.