Elastically Deformable Backing Roll for Rough Plastic Siding
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Solution Overview
Problem
Existing methods for manufacturing molded plastic siding products are limited in creating surface textures that are substantially rougher than the smooth finishes typically achieved, which are desirable for simulating natural building elements like rough-hewn wood or stone.
Innovation Solution
A system and method involving a rotatable backing roll with an elastically deformable rim and an embossing element with a moveable embossing surface, creating a contact patch to impress a rough-textured pattern into heated plastic sheet material, with cooling liquid applied to partially set the plastic and maintain pliability for further forming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If traditional embossing rolls with smooth steel surfaces are used, then the manufacturing process is simple and reliable, but the surface texture of the molded plastic siding product is smooth rather than rough
Solution Approach 1:
The patent changes the surface parameters of the embossing roll by coating it with a material having a high coefficient of friction (such as rubber or silicone) instead of using traditional smooth steel surfaces. This parameter change in surface friction and texture enables the embossing roll to grip and deform the plastic material more effectively, producing a substantially rougher surface texture that simulates natural building elements like stone or rough-hewn wood.
Solution Approach 2:
The embossing roll is constructed as a composite structure combining a rigid core (steel or aluminum) with a compliant outer layer (rubber or silicone coating). This composite design allows the roll to maintain structural integrity while the outer layer provides high friction and elasticity, enabling it to impart rough textures to the plastic siding product during the embossing process.
2Stability of the object's composition
If cooling liquid is applied to partially set the heated plastic sheet material, then the embossed pattern is retained with sufficient pliability for further forming, but the process requires additional cooling system complexity
Solution Approach 1:
The cooling liquid is applied immediately after the embossing process to partially set the heated plastic sheet material while it still retains sufficient pliability. This preliminary cooling action locks in the rough-textured embossed pattern before the material is subjected to further forming operations, ensuring the pattern is retained while the material remains workable for subsequent shaping steps.
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
Enables the production of molded plastic siding products with a rougher texture than previously possible, effectively simulating natural stone or rough-hewn wood surfaces by retaining the embossed pattern while allowing for further plastic forming.
Implementation Method 1
A supply of cooling liquid is provided to the nip point, and at least one of the backing roll and the embossing element being cooled thereby. The supply of cooling liquid is sufficient to partially set heated plastic sheet material moved through the nip point and retain therein an impression of the rough-textured pattern and retain sufficient pliability for further plastic forming of the material downstream of the nip point.
Implementation Method 2
a rotatable backing roll having a first axis of rotation and an elastically deformable rim defining a circumferential surface
Implementation Method 3
The circumferential surface of the backing roll and the embossing surface define a contact patch therebetween that defines a nip point. The rough-textured pattern is impressed into the circumferential surface of the backing roll, and is capable of being impressed into the circumferential surface of the backing roll in the contact patch through heated plastic sheet material moved through the nip point.
Data Source
AI summary
A system for manufacturing from heated plastic sheet material a molded siding product having a rough-textured surface includes a rotatable backing roll having an elastically deformable rim and an embossing element having a moveable embossing surface in compressive engagement with the backing roll. The circumferential surfaces of the backing roll and embossing surface define a contact patch and a nip point. A rough-textured pattern is impressed onto the heated plastic sheet material moved through the nip point. A supply of cooling liquid at least partially sets the heated plastic sheet material to retain an impression of the rough-textured pattern. Respective first and second guide rollers are located higher than the nip point and create a valley defined by the heated plastic sheet material, such that the cooling liquid is collected in a puddle on the heated plastic material proximate the nip point.