Knurled cap, TPE

In contrast to dipped knurled caps, injection-moulded knurled caps made of TPE are PVC round caps, PVC round caps with pull-off tab and Injection-moulded caps with pull-off tab made of TPE especially as Sealing cap for round tubes and hoses used to protect against the ingress of dust and dirt. However, they can also take on the function of a protective cap that protects the external thread of screws and bolts. Protect from damage shall.

The collar of the knurled cap is provided with a non-slip knurling on the outer diameter, which makes it easier to remove the mostly yellow TPE caps at a later date. Although this is also fulfilled in the same way by our caps with a pull-off tab made of TPE, it also offers the advantage of a space-saving design at the ends of the round component to be protected.

Economic advantages

A particularly interesting economic point is that a large number of standard tools are already available for the knurled caps.

This means:

• It must no new, in the purchase and Manufacture of expensive tools become
• Production can Started immediately become
• The Unit costs remain low, especially for large quantities

Process description - Production of knurled caps made of TPE by injection moulding

The manufacturing process for injection moulding knurled caps made of TPE can be explained in simple terms as follows:

Material provision

TPE (thermoplastic elastomer) is generally used as the material. The granulate, which is delivered as bagged goods or in large quantities in big bags on pallets, is fed to the feed hopper of an injection moulding machine via suction lines.

Material preparation

The granulate is melted in the barrel of the injection unit, which is heated by heating belts, homogenised by the rotary movement of the screw and conveyed towards the injection nozzle.

Injection process

The molten and viscous TPE is injected into the injection mould under pressure. To do this, the screw performs a rapid forward movement and presses the material previously conveyed in front of the tip of the screw through the injection nozzle and the distribution channels into the cavities of the cooled multi-cavity mould.

Cooling and curing

The material cools down and becomes solid again in the closed multiple injection mould, which is equipped with a cooling water circuit. This gives the injection moulded part its final shape and stability.

Demoulding

Once the moulded part has cooled sufficiently and become dimensionally stable, the mould opens, the finished cap with the pull-off tab is automatically stripped from the core, falls onto a conveyor belt and is temporarily stored in collecting containers until quality inspection. After demoulding, the manufacturing process described above is repeated.

Inspection and packaging

The caps produced are randomly checked, packaged and prepared for dispatch.