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Flat heat-sealed bellows with mobile blades

Flat heat-welded protective bellows with movable blades are widely used on all types of machine tools: their use is very frequent on machining centres and on chip removal machines. To protect the flat bellows when they are hit by hot chips, it is necessary to shield metal elements, called “lamellae”. The fixing system of the mobile blades on the flat bellows uses springs housed in special clips. These keep the blades adherent and loaded on top of each other to prevent the entry of contaminants and shavings. At the same time, they allow rotation of up to 90 °, to facilitate the fixing of the flat bellows flanges with mobile blades to the machine tool.

PEI thermo-welded flat bellows are made up of:

  • Blades in steel Inox: they form the shield from hot and incandescent chips.
  • Bellows: (3) made with fabrics resistant to water, oil, coolants, dust and shavings.
  • Supports in PVC: (4) they give rigidity to the entire bellows and are cut to size according to the profile of the customer’s rails.
  • Connection flanges (1 and 2) for simple attachment to the machine.

The working position of this application with movable blades are:
-Vertical

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Data

Data

Flat protective bellows with mobile blades

Definition of data for the calculation of the closed pack of PEI heat-sealed flat bellows

P.A. = Open parcel

P.C. = Closed parcel

Corsa = Open parcel – closed parcel

B = Bellows size

a = Bellows height

x = Fold height

Flat protective bellows with mobile blades

Overall dimensions of the fixed blades as a function of the width of the bellow fold

Bellows crease width = x
(mm)
15202530354045
Overall dimensions of the blade above the rail =Z
(mm)
405060708090100
Formulae
Flat protective bellows with mobile blades

Indicative formula for the calculation of the closed pack of thermo-welded flat bellows with mobile blades

        See the materials list

Contact our technical office

Flat protective bellows with mobile blades

Example of calculation

* Let us hypothesise the material of the bellows with the code

“TEMAT151”

** Let us assume that the thickness of the support is 1 mm

*** Let us assume that the thickness of the flange is 2 mm

        See the materials list

Standard materials

Standard materials

The fabrics selected by PEI have excellent mechanical resistance and resist bending and folding that occur during operation in the machine. They have excellent resistance to petroleum products, oils and strong abrasion, small welding splashes or incandescent material.

Main strength characteristics of the bellows materials:

Fabric material codeDescriptionThickness
(mm)
Heat resistancePrimary resistance characteristics
Visible sideFabric insertInternal sideMomentary contact °CContinuous
min. °Cmax. °C
TEMAT 106PtfePolyester0,30+200-30+120
Excellent resistance to oils and chemical products. No adhesive surface. Low friction coefficient. Excellent chemical inertia. Excellent resistance to abrasion and bending strength. Mainly used in grinding machines.
TEMAT 015PolyurethanePolyesterPolyurethane0,25+200-30+ 90
Excellent resistance to petroleum products, oils and heavy abrasion. Excellent bending strength.
TEMAT 151PolyurethanePolyesterPolyurethane0,35+200-30+ 90
TEMAT 164PolyurethaneKevlar*Polyurethane0,35+350-30+180
Excellent resistance to petroleum products, oils and heavy abrasion. Excellent bending strength. Excellent mechanical strength. Kevlar also has excellent shear strength. Normally used when there is heavy mechanical stress, a large amount of sharp shavings, and at high temperatures.
TEMAT 165PolyurethaneNomex*Polyurethane0,36+300-30+130
Excellent resistance to petroleum products, oils and heavy abrasion. Excellent bending strength. Excellent mechanical strength. Good resistance to minor welding splatter or hot material. Widely used in laser cutting machines.
Self-extinguishing.
TEMAT 169PolyurethanePanox*/KevlarPolyurethane0,33+300-30+130
Excellent resistance to petroleum products, oils and heavy abrasion . Excellent bending strength. Excellent mechanical strength. Good resistance to minor welding splatter or hot material. It may be considered as the best fabric on the market for use in laser cutting machines. Self-extinguishing.
TEMAT 017PVCPolyesterPVC0,36+100-30+ 70
Mainly used around heavy ambient dust, minor splatters of coolant and oil. Also suitable for use around acids.
TEMAT 020PVCPolyesterPVC0,25+100-30+ 70

Other SPECIAL materials are available for specific sectors of use. Ask our technical department

Materials for the attachment flanges
Material supportsDescription Thickness (mm)Notes
PVC 05PVC0,50Bellows length (B) up to 300 mm
PVC 10PVC1,00Bellows length (B) from 301 to 700 mm
PVC 15PVC1,50Bellows length (B) from 701 to 1500 mm

The PVC support, shaped to measure with the structure of the customer’s rails and welded to each fold of the bellows, gives the heat-sealed bellows excellent stability.

Flange materialDescription Thickness (mm)
ALAluminium2-3-4-5
INOXAISI3041-1,5-2-2,5-3
ACCarbon steel1-1,5-2-2,5-3-4-5
PVCPVC1-1,5-2-3

The anchoring of the bellows to the machines takes place through the end part of the bellows equipped with rigid flanges in aluminium, stainless steel, carbon steel and PVC.

Flanges

Fixing

Flat protective bellows with mobile blades
  1. = Flange

Attachment flange fixing systems

-Type A et Type I

  • Solution with connection flange Type A: Flange covered by the fabric of the bellows (without last support)
  • Solution with Type I attachment flange: Painted flange fixed to the last support of the bellows
  • Solution with attachment flange in steel, aluminium or PVC sheet
  • Shape and drilling according to the customer’s design
Flat protective bellows with mobile blades

Attachment flange fixing systems

–Type B1 and Type B2

  • Solution with connection flange Type B1: Flange that protrudes entirely from the shape of the bellows
  • Solution with connection flange Type B2: Flange that protrudes externally with respect to the shape of the bellows
  • Solution with attachment flange in steel, aluminium or PVC sheet
  • Shape and drilling according to the customer’s design
Flat protective bellows with mobile blades

Attachment flange fixing systems

–Type C

  • Solution with Type C attachment flange: Painted flange fixed to the last support of the bellows with threaded holes
  • Solution with steel sheet attachment flange
  • Shape and drilling according to the customer’s design
  • The flange holes are threaded
Flat protective bellows with mobile blades
  1. = PVC cover stiffener
  2. = Strip of Velcro applied to the machine
  3. = PVC stiffener
  4. = Flange
  5. = Strip of Velcro applied to the machine

Attachment flange fixing systems

–Type E and H

Solution using VELCRO type quick fixing.

The task of the attachment flange is carried out by a PVC support to which VELCRO is applied. A Velcro strip is applied directly to the machine.

This solution offers the following advantages:

  • Quick application and removal of the bellows
  • Reduced cost

Recommended in dry work environments

Flat protective bellows with mobile blades
  1. = PVC stiffener
  2. = Flange
  3. = PVC stiffener
  4. = Flange
  5. = Counterflange

Attachment flange fixing systems

–Type F and G (Entire fold in PVC )

Solution through HIGH TENACITY quick fixing.

The attachment flange is made of sheet steel, aluminium or PVC, with shape and drilling according to the customer’s design.

This solution offers the following advantages:

  • Quick application and removal of the bellows
  • Perfect perimeter sealing by applying mousse.

Recommended in a humid working environment

Structures

Structures

Flat protective bellows with mobile blades

Standard structures for flat heat-sealed bellows

UL-2ST = Thermo-welded bellows with two welds and internal traction strap

Documentation