* In order to be able to produce caps with peel-off tabs made of soft PVC in a reliable process, we require a Minimum wall thickness of 1.5 mm.
Caps with a pull-off tab are a Further development the standardised Round caps. They are used when, in addition to simple and tamper-proof installation, a Very quick disassembly plays an important role in the finishing process. For example, caps with a pull-off tab in the Automotive industry ensures that a large number of caps used as sealing caps for pipework systems can be removed manually without jeopardising compliance with the specified cycle times.
Through the non-slip geometry of the pull tab the cap compared to the standard round cap can be with one handle can be removed reliably and in significantly less time. Depending on the application, the Wide design the pull tab or the Round shape of the pull tab be the more appropriate design in each case.
The caps with pull-off tab are made from a very flexible, approx. 68 Shore A soft PVC from the Covytec material series. Thanks to the universal material properties, the caps are very versatile and adapt perfectly to the contour of a round component to be protected. However, the caps can also be used to protect oval or even square component cross-sections if dust-tightness is not required.
Typically, caps with pull-off tabs are used as end caps or sealing caps for round pipes, pipe or hose line systems.
If, for structural reasons, the PVC caps become loose when they are removed Vacuum form the Dismantling complicated, a Hole punching in the head area of the cap Remedy.
The production of round caps with a pull-off tab using the dipping process is very interesting from an economic point of view because, in contrast to Caps with pull-off tabs made of TPE, manufactured using injection moulding Only simple and therefore cost-effective dipping moulds are available for production. The dipping moulds are heated in an oven and dipped into a bath of liquid PVC. When the hot moulding tool comes into contact with the PVC paste, also known as plastisol, a thin 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 mould, the dwell time of the mould in the dip tank and the viscosity of the PVC material. The usable height of the protective caps is controlled by the immersion depth of the right-angled 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.
Finally, the multi-cavity mould with the PVC layer is heated again in order to achieve the rubber-elastic properties of the PVC material in accordance with the data sheet. This work step is often referred to as gelling.
After cooling, the caps with the pull-off tab are removed from the cores manually using an auxiliary tool.
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 dipped parts and PVC coatings that meet the highest quality requirements - manufactured in an environmentally friendly way, with 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.
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.
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| For threads | D | max. length | Shape of the flap |
|---|---|---|---|
| M 8 | 7,7 | 60 | Round (3mm) |
| M 8 | 7,8 | 30 | Broad |
| M 10 | 9,7 | 60 | Round (3mm) |
| M 10 | 9,8 | 40 | Broad |
| M 10 | 11,1 | 40 | Broad |
| M 12 | 11,5 | 60 | Round (3mm) |
| M 12 | 11,8 | 30 | Broad |
| M 12 | 12,7 | 40 | Broad |
| M 14 | 13,5 | 60 | Round (3mm) |
| M 14 | 13,5 | 40 | Broad |
| M 14 | 15,3 | 40 | Broad |
| M 16 | 15,5 | 55 | Round (3mm) |
| M 16 | 15,9 | 40 | Broad |
| M18 | 17,5 | 40 | Broad |
| M18 | 19,0 | 40 | Broad |
| M18 | 22,0 | 40 | Broad |
| M18 | 25,8 | 35 | Broad |
| M18 | 31,8 | 35 | Broad |
| M18 | 35,8 | 40 | Broad |
Large and small quantity requirements Direct processing
Large and small quantity requirements
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