What is particularly important we determine in a joint dialogue with the contacts and decision-makers responsible for the end product in the purchasing, design and development departments. In the following knowledge area, the constructive topics of coating with PVC are dealt with in more detail.
Technical Series parts or individual manufactured Individual pieces, components from Metal such as turned parts, bolts, handle elements, bent parts, wire mesh, shelves, workpiece carriers, from Aluminium manufactured die-cast parts and drawn sections or components made from Glass can be used to store heat energy and only release it slowly due to their material properties, Very good in the dipping process with PVC coat.
Thermally stable Plastic parts (> 200°C) and sheet metal parts with a minimum wall thickness of 0.8 mm, on the other hand, can theoretically also be coated. But only Practical tests make it possible to assess whether the coating can fulfil the expectations of a rubber coating.
In addition to the technical, optical, electrically insulating and haptic properties of the PVC coating, is also particularly Protection from environmental influences to be emphasised. Coating with PVC is particularly recommended when the use of standardised Round caps or Rectangular caps are not a sufficient alternative.
When dip coating with PVC (polyvinyl chloride), a component that has been cleaned of oil and grease residues is heated up and then suspended from a workpiece holder in a bath of liquid PVC dipping compound. Covytec material series immersed.
The layer thickness to be achieved depends on the temperature of the component, the dwell time of the component in the dip tank and the viscosity of the PVC material.
After removing the component from the immersion bath, the excess PVC material runs and drips off, whereby flow marks and drop formation cannot be completely avoided.
The coated component is then heated again in order to completely gel or crosslink the PVC layer and ultimately achieve the rubber-elastic properties of the PVC material.
After cooling, the workpiece can then be reworked or packaged directly.
The practical example of crane hooks and grippers for automatic assembly machines shows that the requirement for a abrasion-resistant coating Despite initially having the same task, they differ in detail. In the case of the crane hook, it is the combination of abrasion resistant and anti-twist hold of a rather hard PVC coating material, in the case of the gripper it is the interaction with a somewhat softer PVC type of the Covytec material series with sufficient Damping property.
Due to a predominantly optical smooth and shiny surface of the coating, softer PVC types can be characterised by a anti-slip property can be spoken. For the coating of grip elements for sports equipment that are handled with bare hands in a manner appropriate to the application, the additional Advantages in a quick and easy to carry out Disinfection and Cleaning of the surface.
In addition to a classic partial coating, in which parts of the component are not coated or functional surfaces are subsequently cut free of the PVC coating, a Complete coating possible. Just as with partial coating, the component must be dipped in a special coating bath before heating and actual coating. Suspension (e.g. wire eyelet, hook, screw connection, etc.)). After coating and final heat treatment in the oven, the fully coated parts are removed from the suspension. Depending on the size and design of the attachment, a more or less pronounced Missing part be recognisable by the coating.
The application examples of coated products are as varied as the Wishes and priorities of our customers from the most Industries. Even customers of the Medical technology on the material properties of our Covytec PVC material range. In our blog post Solutions for sensitive applications we present tried-and-tested use cases.
Our PVC dipped parts are manufactured with a salt-free heat transfer system - completely without lithium nitrate or potassium nitrate - for Maximum purity and safety.The result is particularly clean, dimensionally stable and durable PVC-coated components that meet the highest quality requirements – manufactured in an environmentally friendly manner, while also offering improved occupational safety and easier disposal.
*Light colours that are exposed to outdoor weathering can be made UV-stable by adding a formulation ingredient. Dark colours such as black and anthracite grey are generally UV-resistant.
As both the base material (PVC plastisol) and a UV stabiliser have a yellowish inherent colour, the accuracy of the RAL colour shade is minimally affected. We confirm the colour shade similar to the RAL number.
One optically matt and in the style of a sandblastedhaptically sophisticated, fine-pored surface our Covytec bead profile types Because of these remarkable material properties, the Style element for Designed, visually appealing coating parts recommended.
What all standard PVC materials have in common is that they without the use of an adhesion promoteralso called primer, No fixed connection to the surface of the coating partners. The PVC functional layer shrinks onto the component after the process-related, final heat treatment and, as it were, embraces the component. A coating without the use of adhesion promoters is still completely sufficientwhen the Geometry of the component an accidental Twisting the coating disabled or makes detachment difficult.
The fact that PVC layers can be removed from the component without the use of an adhesion promoter can be removed without residuewe take advantage of this in the manual post-processing of Functional areaswhose coating is not desired. These surfaces and areas are removed with a cutting knife cut free. Traces of manual knife use remain on the cut edges due to the process. The cut can therefore appear uneven, even when using a cutting gauge.
The Use of an adhesion promoter is used for components that require Inseparable connection between the PVC layer and the component surface require functional.
The application examples of coated products are as varied as the Wishes and priorities of our customers from the most Industries. Even customers of the Medical technology on the material properties of our Covytec PVC material range.
One of these priorities and important prerequisites from the extended environment of the food industry is the detectability of the PVC material of products, which, depending on the application, can also be transferred to components of PVC coatings. Accordingly, detectability in the Blog post Detectable caps discussed in detail.
The Wall thickness is measured non-destructively at the upper edge of the coating.
Due to the process, it increases continuously towards the lower end of the coated component.
Drain marks and drain drops are due to the process and, in particular, the geometry and cannot be avoided.
The Clearance of functional areas is carried out with a cutting knife. Due to the process, the cut edges remain Traces of knife use. The Cutting guide can, even with the use of a cutting gauge restless have an effect.
With Use of an adhesion promoter is made from the coating edge for optical reasons protrude slightly beyond the applied area after the dipping process. This coating edge can be lifted with a spatula.
With Complete coatings the coating at the site of the suspension will be a Missing part show.
They all represent No quality defects represent. Please take this information into account when assessing the delivery quality.
In your role as a strategic buyer, as a contact person in the design and development department, as a technician, quality engineer, production or operations manager, you are involved in other areas of the company, detailed information about coating with PVC, in particular about the special features, restrictions and Design recommendations interested?
The following are examples drawn and labelled as Ideal cross-section geometries These moulds are suitable for coating the component without the use of an additional bonding agent. The PVC coating shrinks completely onto the surface of the component after the final heat treatment.
Simplified it could be said that any cross-section geometry is suitable for coating without adhesion promoter, where a rubber band that is put over or a rubber ring that is pulled on every corner, every radius and every surface of the component Fully touched.
By using an adhesion promoter, it is possible to prevent the coating from detaching from the component surface due to tensile stress. critical cross-section geometries to counteract this.
The adhesion promoter is not applied to the entire surface, but only partially to the areas of the component that are considered critical. After the final heat treatment, the PVC protective layer is applied to these areas treated with the primer. an inseparable bond with the component surface and to mechanical only or chemically removed.
As the Adhesion promoter especially on metallic surfaces as whitish coating visible would be for optical reasons It is generally ensured that the upper edge of the coating protrudes beyond the primer-treated area after the dipping process. Only the outermost edge of the coating can be lifted with a spatula. In this context, when assessing the delivery quality, please consult our Quality notes to be taken into account.
Dark colours such as black and anthracite grey are extremely UV and weather resistantThis is due to the UV-stable colour pigment carbon black, which makes up a high percentage of the formulation of the colour batch used.
In bright colours coated components that are used in the practice of Outdoor weathering exposed, the PVC material must have a UV stabiliser can be added to the recipe.
As both the liquid base material (PVC plastisol) and the UV stabiliser have a yellowish inherent colour, this has a minimal effect on the accuracy of the RAL colour tone. Using the protective caps above the recommended continuous use temperature leads to a yellowish discolouration, especially with light colours. For the aforementioned reasons, we confirm for our Standard colours and special colours only similar to the RAL number.
In order to achieve an optimum coating result, the areas of the components to be coated should be oil and grease free, with a technically smooth, not polished, preferably sand or glass bead blasted surface be provided.
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