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Isolants thermiques en rénovation

Par Sophie Trachte et Dorothée Stiermon

Editeur EPFL

 

Ouvrage très technique et très complet sur les différentes techniques et les différents matériaux disponibles en rénovation thermique des constructions. Cet ouvrage décrit avec précisions les caractéristiques des différents matériaux présents sur le marché (isolants organiques, isolants minéraux naturels ou synthétiques, isolants composites, isolants innovants) en les décrivant (avec de nombreuses photos à l’appui) précisant leurs caractéristiques techniques chiffrées, leurs modes d’élaboration, et en balayant un grand nombre de critère permettant d’avancer vers le meilleur choix correspondant au matériau recherché .

Dans un chapitre complet il détaille leur influence sur la qualité de l’air et sur la santé. Il aborde ensuite sur une quarantaine de pages le cycle de vie des différents matériaux et leur impact environnemental.

Il aborde la notion de l’économie circulaire dans la conception et la mise en œuvre de ces différents matériaux.

 

Nombreux tableaux, articles scientifiques et thèses sur le sujet.

 

En annexe figure une liste de fabricants et producteurs

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Riou glass rentre sur le marché espagnol

 

Aprés une série de rachats de miroiteries en France sur ces 15 dernières années, puis être rentré en Belgique ( Euroglass) et en Italie ( Cappelletti et Roleri ) en 2022, le groupe Riou glass s’attaque maintenant au marché espagnol en rachetant le catalan Vidresif situé à proximité de Géron. Vidresif est une importante miroiterie avec un CA de l’ordre de 25 millions d’Euros. Le groupe Riou transforme chaque année plus de 100 000 tonnes de verre plat dont il produit une grande partie sur son float de Salaise sur Sanne. Il réalisera sur 2023 un CA supérieur à 260 millions d’Euros avec 1300 salariés et 26 unités de production

Bavelloni at GlassBuild AMERICA 2023

 

Bavelloni is pleased to announce its participation in the show  GlassBuild AMERICA 2023, the largest event for the glass, window, and door sectors in North America. Taking place in Atlanta (GA), from October 31 to November 2, 2023, the event will feature Bavelloni America Inc. at booth 3631.

 

On this occasion, Bavelloni will showcase some of its glass edging machinery, including the VE 500 V10 SCS mitering machine. This straight-line edger, suitable for heavy glass, can process flat edge with arrises and chamfers ranging from 0° to 45°. Notably, the SCS version of this machine incorporates an innovative spindle control system (SCS) for enhanced automation. This system ensures automatic wheel positioning, resulting in high quality finishes, minimized production waste, and optimized tool utilization. The Bavelloni VB 350 CNS bevelling machine, known for its efficiency, reliability, reduced maintenance and long lifespan will also be presented. Moreover, visitors will experience live demonstrations of the Bavelloni REV 372 SR cutting table, a very compact, accurate and fast stand-alone bench for straight and shaped cutting of monolithic glass. Also on display, a wide selection of Bavelloni diamond and polishing tooling.

 

Bavelloni’s team of experts will be on hand at our stand throughout the event to welcome guests and provide comprehensive insights into Bavelloni's diverse product portfolio.

 

To gain complimentary access to the exhibition, enter Bavelloni Customer Guest Pass Code 23GBAEXH upon your online pre-registration.

 

 

 

 

 

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Affutage des forêts diamantés pour le verre plat

La partie active d’un forêt diamanté, celle qui va permettre de percer le verre est constituée de grains de diamant. Ces grains de diamant sont noyés dans un alliage métallique qui a pour objectif de libérer peu à peu le diamant en surface du forêt diamanté de façon à pouvoir percer le verre.

En perçant le verre la partie supérieure du diamant va se briser peu à peu.

Ce liant doit s’user à la même vitesse que le diamant. S’il s’use trop vite il y a trop de diamant en surface et le forêt va s’user très rapidement et il y a un risque que le perçage se fasse avec des écailles. S’il s’use moins vite que les particules de diamant il n’y aura pas assez de grains de diamant en surface et le forêt ne percera plus le verre correctement. Dans ce dernier cas il faut affuter le forêt de façon à user le liant et refaire apparaitre des grains de diamant en surface. On utilise pour cela des pierres synthétiques, généralement en oxyde d’aluminium.

Mais le besoin d’affutage des forêts devrait être rare, du moins pour les meilleurs forêts diamantés. En effet les fournisseurs qui sont dans ce cas utilisent des liants qui s’usent à la même vitesse que le diamant et donc sans besoin d’affutage.

L’affutage est un réel problème dans le cas des perceuses automatiques.

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Numerical control machine for flat glass processing

 

The CNC machines for glass are machines able to carry out all kind of jobs. The technology is trustable and the main evolutions have been done.

Because they are able to supply a huge range of different applications you could be interested to invest in a sophisticated machine, even if your market requires only the more common works. In this case you can not have the more convenient machine for the applications you need and moreover the machine will be less easy to drive and less fast.

So the first step is to draw up carefully (number of glass, minimum and maximum dimensions, thickness...) a list about

-the main jobs required by your market (cutting, internal and external polishing, engraving, drilling, writing, bevelling, disk cutting...)

 

-The applications it could be interesting to propose to your customers (number of glass, potential yearly turnover).

 

The idea is to choose the right CNC machine to carry out in the best conditions ( profit, easiness to use, cheapest maintenance) what your market requires.

The market is full of very sophisticated CNC machines where only 10 or 20% of the CNC machine's capacities are used.

 

 

 

 

 

 

Technorev de Bimatech

 

There are on the market 3 different kind of CNC machines depending the number of axes' spindles.

-The 3 axes (XYZ) allowing to carry out the majority of glass processing works ( cutting  with milling cutter, drilling, internal and external polishing, writing...).

-The 4 axes (XYZ et C, axe allowing to drive the working angle for a tools on the vertical axe).

The C axe is mainly useful for engraving glass on the surface, for cutting with a disk ( shape or straight), for simple bevels, to engrave or to write on the glass edge and to obtain a top quality polishing with cup wheels.

 

-The 5 axes, allowing all kind of bevels and other complex works on glass.

 

The number of axes is the first criterion choice.

Be careful: one additional axe mentioned in option needs very often to change the spindle.

The second thing to decide is the maximum dimensions of glass you want to work.

Be careful: on  machine brochure is often mention the  axe's movements and not the useful maximum dimensions.

 

Once these 2 parameters decided, you can have a more precise idea about the machine you need and start to have a look on the potential suppliers.

Now you can study other important parameters:

1/Assistance
-Installation

-In case it is your first machine, or a really new machine or an operator without experience on CNC machine for glass it could be interesting to cut the training in several periods allowing your operator to learn the machine driving in the best conditions. (Be careful about the number of days for real training included inside the offer, and no the total days including installation, adjustment and training. Installation and adjustment can take more than one week).

-Assistance during the first months machine using

To drive properly such a CNC machine, an operator need several months. During this period you need to have a good assistance to learn quickly.

-Maintenance

The problems come mainly from mistake in drawing and programming. In these cases the CNC machine stops. Such problems can be easily solved by phone. A fast and efficient hot line by the CNC machine supplier is essential. But a real hot line. Not one from technician driving or giving another training at a customer premise.

So it is important to understand how your supplier is organized to answer (number of technicians, number of machines installed....)

 

2/The options:

What are the options available during the purchase and after.

The main interesting options are

-Engraving

-Bevelling

-Cutting with disk

-edging with cup wheels

-...

 

3/The software

 

4/The machine preparation

The solutions chosen are very important for the CNC machine productivity

-Installation of the glass on the CNC machine ( suckers positioning, reference pads...)

-Loading, unloading

-How to work with templates

-Adjustment for tools wearing

-…..

 

5/Costs for using (water..) and maintenance

 

 

The bevel

-Due to the glass flexibility, within 12 mm thickness in case of bevelling the glass must be sustained by a rigid and flat surface.

So you have to manufacture a template or to install suckers under the glass all along the part you are going to bevel.

-Such a machine bevels wheel after wheel. It is very slow. To have  a good financial profit you have to carry out sophisticated bevels or to work on important thickness

-The final polishing ( water + cerium oxide)  pollutes the machine water network. The cerium oxide is lost.

-The bevel programming is very often not easy and need an operator with very good experience.