* In order to be able to produce hexagonal caps made of soft PVC in a reliable process, we require a Minimum wall thickness of 1.0 mm.
The essential Advantages dipped hexagonal caps are not only their quick and Easy to install on hexagon bolt heads and hexagon nuts.
In contrast to hard plastics such as Polyethylene (PE for short) or Polypropylene (PP for short)are the rubber-flexible Covytec ® soft PVC types the ideal material for the Use as transport protection cap, bearing protection cap or cap for Protection from the weather.
The shock-absorbing properties of the PVC used and the choice of a signal colour also make hexagonal caps a Product in the field of occupational safety.
The production of corner caps using the dipping process is very interesting from an economic point of view, as only simple and therefore cost-effective dipping moulds need to be available for production. The multiple dip mould is heated in an oven and its cores are dipped into a bath of liquid PVC. When the hot moulding tool comes into contact with the PVC paste, also known as plastisol, a skin forms on the outer contour of the shaping cores, which forms the desired wall thickness of the corner caps by the end of a defined dwell time in the dipping bath.
The wall thickness to be achieved depends on the temperature of the tool, the dwell time of the tool in the dip tank and the viscosity of the PVC material. The height of the protective and end caps for hexagon nuts is controlled by the immersion depth of the mould cores.
After removing the dipping mould from the dipping bath, the excess PVC material runs and drips off, whereby flow marks and drop formation at the closed end of the rectangular caps cannot be avoided.
The multi-cavity mould with the PVC layer is then heated again to achieve the rubber-elastic properties of the PVC material. This work step is often referred to as gelling.
After cooling, the hexagonal caps are manually removed from the cores using an auxiliary tool.
*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.
The standard soft PVC used by HAMCO from the Covytec® material serieswhich is predominantly processed in 68 Shore A, but also in other hardness grades, has a high degree of hardness regardless of the selected hardness. Standard or special colour has sufficient elasticity for secure installation.
Submerged hexagonal protective caps with or without Punched through-hole for screws are manufactured undersized so that they can be slightly stretched during manual or automated assembly.
The flexibility of the Covytec® PVC materials ensures that the barely noticeable elongation immediately recedes after installation and that the technically smooth inner contour of the PVC dipped parts moulds itself firmly to the flanks of the screw head or nut to be protected.
Both the Static friction as well as from the elongation of the material centrally acting compressive forces already provide a captive hold of the mounted hexagonal caps.
A simple structure of the Dipping tools ensures that we can offer you the best possible service with our excellently equipped In-house toolmaking measurable Cost and time benefits in the realisation of new dimensions.
An important prerequisite that may need to be taken into account from the environment of the food industry is the detectability of the PVC material used in the Blog post Detectable caps is discussed in detail.
The Wall thickness is measured non-destructively at the open end of the cap.
Due to the process, it continuously increases towards the closed end of the immersed caps.
Drain marks and drain drops At the closed end, they cannot be completely avoided due to the nature of the process.
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 the process of PVC dipped parts production interested?
On the product pages of the PVC round capsthe Rectangular caps, the product page of the Coating of metallic components and in the knowledge section under Manufacturing processes we provide detailed information including generally applicable design, assembly and quality instructions.
Blog posts are a helpful tool for communicating technical and specialist content.
With your Subscribe to the newsletter Make sure you don't miss any of these blog posts.
We understand that you would rather see what a blog post is about first.
To reading sample
Large and small quantity requirements Direct processing
Large and small quantity requirements
You are currently viewing a placeholder content from Vimeo. To access the actual content, click the button below. Please note that doing so will share data with third-party providers.
More InformationYou are currently viewing a placeholder content from YouTube. To access the actual content, click the button below. Please note that doing so will share data with third-party providers.
More InformationYou need to load content from reCAPTCHA to submit the form. Please note that doing so will share data with third-party providers.
More Information