JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 41
fibre, fillers (Figure 3). Different resins are chosen as a function of the chemical nature, pH and temperature of the specific effluent to be transported, e.g. vinylester resins for industrial applications. For drinking water supply systems, a specific resin that meets the applicable criteria and standards is used. Type E or C glass is used for the fibre reinforcement. These high-quality fibres are specially sized to obtain optimum, durable adhesion with the resin. Quartz sand is the most commonly used filler: it helps to lower the cost of the product yet increase the pipe wall’s moment of inertia for greater specific hoop stiffness. The particle size of the sand used ranges from 0.1-1.0. The sand is washed and high-temperature dried.
The manufacturing process
cess is fully automated. A programme controls the feeder arm that continuously feeds the three basic components – glass fibre, unsaturated polyester resin and reinforcing/aggregate materials – into a rotating 6-metrelong mould. The pipe is manufactured layer after layer. Production involves applying a certain algorithm as a function of the customer requirements for the pipe properties, stiffness and pressure class to make a standardized wall with specific structural layers, in compliance with the DIN 16869 standard. The high pressure (from 30 to 70 bar) that is applied during the centrifugal casting process increases the pipe’s compactness and forces out the air. The result is a highly compact wall without voids – which is particularly important for quality in GRP products. Although it is theoretically
the company uses is centrifugal casting. The pro-
possible to produce an unlimited number of ranges, HOBAS pipes always have a characteristic wall structure. A core layer made of aggregates and resin is covered on each side by a glass fibre/resin-rich layer. The transitions between layers are gradual as the ratio among the different materials changes. On the outside, the resin layer is heavily filled with sand for U.V. resistance. The last step of the manufacturing process consists in creating the liner, a pure resin layer on the inside. Following production, the pipes are taken out of the centrifugal casting mould and inspected to verify that they comply with the required quality criteria. The ends are bevelled, a coupling is attached to one side, and the pipes are subjected to a final inspection. No further treatment is necessary. The pipes are ready for shipping. n
More information: www.hobas.com
No77 December 2012 /
jec composites magazine 41
Feature Construction
http://www.hobas.com
http://www.eco-dec.be
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012
Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #77 - December 2012
Cover
Edito
Point of view: strategy
Agenda of Events
COMPANY & BUSINESS In Brief
- Event
APPLICATIONS
- Shelter
- Van
- Bus
MARKET
- Human resources
- Epoxy resin
FEATURE CONSTRUCTION
- Education
- Indian experience
- Civil engineering
- Pipe
- Sewer pipe
RESEARCH & DEVELOPMENT
- Infusion
- IR welding
TECHNOLOGY & INNOVATIONS
- 3D preforming
- Tools
- Tools
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - Cover
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 2
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - Edito
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - Point of view: strategy
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 5
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 6
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 7
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 9
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - COMPANY & BUSINESS In Brief
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 11
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Event
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 13
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Shelter
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Van
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Bus
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Human resources
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Epoxy resin
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 19
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 20
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Education
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 22
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 23
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 24
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Indian experience
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 26
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 27
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 28
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Civil engineering
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 30
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 31
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 32
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 33
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 34
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 35
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Pipe
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 37
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Sewer pipe
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 39
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 40
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 41
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Infusion
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 43
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - IR welding
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 45
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 46
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 47
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - 3D preforming
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 49
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 50
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Tools
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 52
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - - Tools
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 54
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 55
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 56
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - Index
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - In the world
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 59
JEC COMPOSITES MAGAZINE - Issue #77 - December 2012 - 60
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