Manufacturing and repair of banana shafts

What is a banana shaft and what is it used for?

Val banana - is a specialised industrial shaft with a curved axis designed for eliminating wrinkles, stretching and Alignment of rolled materials during rewinding or feeding. Its unique design creates tension that "stretches" the flexible material in the transverse direction, eliminating wrinkles, deformations, distortions and air bubbles.

🔧 The purpose of the banana shafts - Ensure uniform tension on the web as it moves through the production line. This is particularly important for processes where surface quality is critical.

Areas of application for banana shafts

Banana shafts are widely used in industrywhere they deal with roll materials. The most common industries:

• Pulp and paper industry - for processing paper, cardboard, kraft.

• Polymer industry - in the production of film, packaging materials, polyethylene, and polypropylene.

• Production of adhesive tape and adhesive tapes - where even minor creases can affect the adhesive properties.

• Textile industry - when processing fabrics, non-woven fabrics, and non-woven materials.

• Metallurgy and foiling - in the production of aluminium foil and laminates.

• Label production - Where precise, crease-free film or paper feeding is required.

⚙️ Where are the banana shafts installed?

Banana shafts are part of a variety of technological equipment:

• Extrusion lines - during the production of films, when it is important to keep them smooth and crease-free.

• Flexographic printing machines - where the unevenness of the web affects the print quality.

• Bean cutters - when cutting wide coils into narrow strips without deformation.

• Laminators, rewinders, coating lines - for consistent tensioning of rolled materials.

In such machines, the banana shafts are usually located in front of the drive shafts, unwinders, cutters or printing sections.

How the banana rollers work

The banana rolls have curved axial design. In contrast to straight rolls, they produce a controlled stretch of the coiled material across the width. This is due to the special tension applied from the centre point of the axis to the edges. This deformation causes the material to stretch, smoothing it out and preventing the formation of creases, wrinkles or air pockets.

The main mechanism:

1. The material passes through a curved shaft.

2. Tension is created in the central part.

3. The tension moves to the edges, creating smoothing effect.

4. The material is then fed back evenly tensioned and without deformation.

This principle is especially effective when working with thin and elastic materialsThe skin can easily form wrinkles.

Advantages of using banana rollers:

• Improving product quality - minimising visual defects on the surface.

• Stable material flow - without distortions, stops or tension errors.

• Reducing rejects - avoiding deformation and damage to the material.

• Increase line productivity - No downtime due to malfunctions or replacement of defective material.