Paper Straw Shaping with Thermoplastic Coating and Internal-External Deformers
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Solution Overview
Problem
Existing methods for shaping paper straws fail to create permanent flexible portions with clear, defined bends, leading to instability and inefficiency in production, particularly in high-volume industrial settings, due to the material's elastic properties and the need for complex, labor-intensive setups.
Innovation Solution
An apparatus comprising internal and external shaping means, including corrugating units and shaping spindles, that cooperate to create annular ridges and throats on tubular elements, allowing for continuous deformation and compression to form stable, flexible shaped portions, enabling efficient production of paper straws with high productivity and ease of format changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical deformer members act on paper straws for a short period (rotation time), then the deformation process is fast, but the throats and ridges are not stable and permanent
Solution Approach 1:
The paper straw is pre-coated with a thermoplastic composition before the deformation process. This preliminary action prepares the material by reducing its mechanical resistance to permanent deformation, allowing the mechanical deformer members to create stable and lasting throats and ridges even during brief contact periods in high-speed production.
Solution Approach 2:
The thermoplastic coating changes the physical parameters of the paper material, temporarily reducing its elastic recovery tendency and mechanical resistance. This parameter change enables permanent deformation to be achieved quickly and stably, resolving the contradiction between fast deformation and stable shape retention.
2Manufacturing precision
If complex mechanical deforming systems are used to shape paper straws, then the flexible portion can be formed, but the setup and maintenance become laborious and time-consuming
Solution Approach 1:
The thermoplastic coating is applied in advance to all paper straws during the manufacturing process. This preliminary preparation eliminates the need for complex, labor-intensive deformation systems, as the pre-treated material responds to simple, efficient deforming actions, thereby reducing both device complexity and maintenance requirements.
3Adaptability or versatility
If paper straws are deformed to create flexible portions, then bending capability is achieved, but the elastic properties of paper cause the material to return to its original shape
Solution Approach 1:
The thermoplastic coating fundamentally changes the mechanical parameters of the paper material in the treated zone. It reduces elastic recovery and enables permanent deformation, allowing the straw to maintain its bent shape with stable throats and ridges while retaining bending capability where needed.
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 enables the production of paper straws with stable, permanent flexible portions, achieving high productivity rates and simplifying maintenance and format changes, making the process more economical and efficient for industrial use.
Implementation Method 1
a treatment composition comprising a thermoplastic composition is fed into a treatment zone, in which the mechanical resistance of a paper material to permanent deformation is reduced by the action of heat and pressure
Data Source
AI summary
An apparatus and a method for shaping tubular elements (100), preferably made of paper, to make straws. In particular, a flexible shaped portion, defined by a succession of annular ridges and throats, is made on each tubular element (100) by means of internal shaping members (32) and external shaping members (35) mutually cooperating with each other.