Flat protective bellows without laminations
Thermic-welded flat bellows: more safety for machine tool guides
The P.E.I. thermic-welded flat covers guarantee optimal protection for any type of machine tool thanks to the different shapes and the high-quality of the materials. The selected materials are wear-proof and heat-resistant, making the standard P.E.I. thermic-welded covers ideal for protecting the parts of machine tools.
P.E.I. thermic-welded flat bellows are composed of:
- Bellows (1): fabrics resistant to water, oil, coolants, dust and shavings.
- PVC supports (2): give rigidity to the entire bellows and are cut to fit according to the profile of the customer’s guides.
- Connection flanges (3 and 4): for simple attachment to the machine.
Data
Data
Definition of data for the calculation of the closed length of PEI thermic-welded flat bellows
P.A. = Open length
P.C. = Closed length
LC (Stroke) = Open length – closed length
Ap = Open fold
B = Bellows width
a = Bellows height
x = Fold height
Formulae
Indicative formula for calculating the closed length of thermic-welded flat bellows
Example of calculation
- * We hypothesise the material of the bellows with the code “TEMAT015”
- ** We hypothesise that the thickness of the support is 1 mm
- *** We hypothesise that the thickness of the flange is 2 mm
Standard Materials
Standard Materials
The fabrics selected by PEI have excellent mechanical resistance and resist bending or folding that might 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 code | Description | Thickness (mm) | Heat resistance | Primary resistance characteristics | ||||
| Visible side | Fabric insert | Internal side | Momentary contact °C | Continuous | ||||
| min. °C | max. °C | |||||||
| TEMAT 106 | Ptfe | Polyester | 0,30 | +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 015 | Polyurethane | Polyester | Polyurethane | 0,25 | +200 | -30 | + 90 | Excellent resistance to petroleum products, oils and heavy abrasion. Excellent bending strength. |
| TEMAT 151 | Polyurethane | Polyester | Polyurethane | 0,35 | +200 | -30 | + 90 | |
| TEMAT 164 | Polyurethane | Kevlar* | Polyurethane | 0,35 | +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. Self-extinguishing. |
| TEMAT 165 | Polyurethane | Nomex* | Polyurethane | 0,36 | +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 169 | Polyurethane | Panox*/Kevlar | Polyurethane | 0,33 | +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 017 | PVC | Polyester | PVC | 0,36 | +100 | -30 | + 70 | Mainly used around heavy ambient dust, minor splatters of coolant and oil. Also suitable for use around acids. |
| TEMAT 020 | PVC | Polyester | PVC | 0,25 | +100 | -30 | + 70 | |
* Kevlar, Panox and Nomex are registered trademarks.
SPECIAL MATERIALS are also available for specific jobs. Contact our technical office.
| Support Material | Description | Width (mm) | Note |
| PVC 05 | PVC | 0,50 | Bellow lenght (B) until 300 mm |
| PVC 10 | PVC | 1,00 | Bellow lenght (B) from 301 to 700 mm |
| PVC 15 | PVC | 1,50 | Bellow lenght (B) from 701 to 1500 mm |
The PVC support, designed to measure with the shape of the customer’s guides and welded to each fold of the bellows, gives the heat-sealed bellows excellent stability.
| Flange Material | Description | Width (mm) |
| AL | Aluminium | 2-3-4-5 |
| INOX | AISI304 | 1-1,5-2-2,5-3 |
| AC | Carbon Steel | 1-1,5-2-2,5-3-4-5 |
| PVC | PVC | 1-1,5-2-3 |
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
- = 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 drawing
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 drawing
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
- = PVC cover stiffener
- = Strip of Velcro applied to the machine
- = PVC stiffener
- = Flange
- = 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 for dry work environments
- = PVC stiffener
- = Flange
- = PVC stiffener
- = Flange
- = 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 for wet work environments
Structures
Structures
Standard structures for flat thermic-welded bellows
UL-OS = Folding fabric only
UL-2ST = Thermic-welded bellows with two weld seams and pull-out stop inside the bellows
UL-1S = One-sided bellow with PVC supports
UL-3S = One-sided thermic-welded bellows with three welded edges
DL-DXC = Thermic-welded bellows with two welded edges
TL-SIM = Thermic-welded bellows with three welded edges, symmetrical shape
TL-DXC = Thermic-welded bellows with three welded edges, asymmetrical shape
TL-DXI = Thermic-welded bellows with three welded edges, slanted shape
CL-SIM = Thermic-welded bellows with five welded edges, symmetrical shape
QL-QUAD = Thermic-welded bellow, square shape
QL-CAP = Thermic-welded bellow, roof shape
QL-RETT = Thermic-welded bellow, rectangular shape
QL-ASI = Thermic-welded bellows with four welded edge, asymmetrical shape
CL-ASI = Thermic-welded bellows with five welded edge, asymmetrical shape
Documentation
Questionnaire
