Composite Profile Coextrusion Adhesion via Surface Pretreatment
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Solution Overview
Problem
Existing methods for producing composite profiles through coextrusion are limited in material choice and adhesion between different plastic components, leading to suboptimal bonding strength.
Innovation Solution
A method involving a pretreatment zone where a first cooled plastic profile is mechanically processed to create a profiled surface, combined with preheating and the application of an adhesion promoter, followed by extrusion of a second profile under controlled ambient pressure, to enhance adhesion between the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a first profile is cooled in a calibration device until it reaches a dimensionally stable state, then the dimensional stability of the first profile is improved, but the adhesion between the first profile and the second profile deteriorates
Solution Approach 1:
The invention applies preliminary action by treating the contact surface of the first profile before the second profile is extruded onto it. Specifically, the contact surface is heated to soften the thermoplastic material, and mechanical profiling (such as roughening or creating grooves) is performed while the material is in this softened state. This preliminary preparation of the surface ensures that when the second profile is extruded, it can adhere strongly to the pre-treated surface, thus resolving the adhesion problem while maintaining the dimensional stability achieved during cooling.
2Strength
If the contact surface of the first profile is softened by reheating, then the adhesion between profiles is improved, but the dimensional stability of the first profile deteriorates
Solution Approach 1:
The invention applies local quality by heating only the contact surface of the first profile to a limited depth, rather than heating the entire profile. The heating is localized to the region where adhesion is needed, and the temperature is controlled so that the material softens sufficiently for bonding while the bulk of the profile remains cool and dimensionally stable. This localized treatment allows improvement in adhesion strength without compromising the overall dimensional stability of the first profile.
3Strength
If mechanical profiling is applied to the contact surface of the first profile, then the adhesion between profiles is improved, but the surface quality of the first profile deteriorates
Solution Approach 1:
The mechanical profiling is performed as a preliminary action on the contact surface of the first profile before the second profile is extruded. The profiling process (such as roughening, grooving, or creating a textured pattern) is applied to increase the surface area and mechanical interlocking capability of the contact surface. Although this deliberately alters the surface quality by creating a rougher texture, it significantly improves adhesion strength. The rest of the first profile maintains its original smooth surface quality and dimensional precision.
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 significantly improves the bonding strength between plastic components by creating a micro-roughened surface and optimizing the interaction between materials, leading to a more stable and durable composite profile.
Implementation Method 1
a heating device (24) is arranged in the pre-treatment device (6) in order to heat the first profile (1)
Implementation Method 2
The surface of the first profile 1 is heated by means of a laser device 41
Implementation Method 3
The adhesion between the profiles is achieved through the interaction between the two components using physisorption or chemisorption
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The invention relates to a method and device for producing a composite profile made of extrudable plastics, wherein a first profile (1) is first extruded and then cooled in a calibration fixture until a dimensionally stable state is reached, then extrusion coated in an extrusion coating zone (3, 18, 19) by at least one second profile (2), characterized by treating by a mechanical and/or chemical pretreatment, by changing the ambient pressure in a pretreatment zone (4, 14, 15) and/or by irradiation by laser radiation (40) for heating the first profile (1), wherein said treatment is upstream of the extrusion coating zone (3, 18, 19) in the direction of extrusion (E).