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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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Horizontal numerical control machines for stone, marble and granite processing

The numerical control machines for stone processing coming 15 years ago on the stone market have been a revolution, because thanks to these machines it could be possible

-To carry out in an automatic way very long or complex processing only possible with high qualified operators

-To partially solve the manpower problem

-To propose more profitable works (OG edge, slanted planes..) to the customers

-To increase productivity (the machines being able to work without an operator for night..)

-To improve working conditions (dust, water..)

 

 

 

 

Technostone from Bimatech

 

But they have brought other problems.

-The manpower was not really solved, because a good cnc operator is not easy to engage

-The cnc operator is often the only one able to drive the machine. In case of illness or if he leaves the company the machine stop and there is the training cost for a new operator.

-Some stone processing (slanted plane..) can be difficult to carry out on the machine and need a manual finition.

-If the machine is out of order the production stops.

-The maintenance costs are high.

-The polishing quality is less good (the machine work with peripheral wheels and let lines on the edge)

The cnc machines for stone are able to carry out everything. For the most important cnc machines suppliers the technology is now reliable  and the  most important evolutions are done

 

The choice is huge. In front of a so important offer to choose the right cnc machine (technical performances, budget, service..) is really difficult.

The first question is to carefully decide what the machine has to carry out (maximum dimensions and stone  thickness, number of pieces, usual kind of realisations....). What is the reason why you need such a machine? It is from this list that you are going to be able to determine its technical
characteristics.

 

After you can add the job it could be interesting to propose to your customers (how many potential turnover, how many pieces...). This can give an idea about the option required.

 

In front of such an offer it is easy to be tempted by a cnc machine able to carry out (during the demonstration done by the supplier operator) marvellous things. But this marvellous cnc machine can be not the more efficient (speed, software, service..) to carry out the work you have every day, the 95% for which you need this machine.

Moreover there are also the additionnal purchasing cost and the surface in your workshop.

 

There are mainly 3 different machines available dependinf the axes number.

 

-The 3 axes (XYZ)  able to do  more than  80% of the processing need. (cutting with milling cutter, internal and external edging and polishing, writing, some engraving)

-The 4 axes (XYZ and C,  axe able to drive the working  angle for axe Z)

The C axe is useful for polished and more sophisticated engraving, for cutting with a cup disk or with a flat disk, whatever the angle, for cup wheels polishing...

-The 5 axes able to carry out other complex jobs.

 

The first decision is to choose the axe number.

Be careful. In certain cases additionnal axes are available (options). But they need very often to change the spindle (cost for the spindle and for the technician intervention)

 

The second decision is the maximal working dimension you need.

Be careful. Some suppliers mention the maximal axes mouvements and no the maximal workable dimensions.

 

Once these 2 points decided you can start to study which machines you are going to have a look more carefully.

 

Other important points:

-Assistance

It is a key point to have a machine working in good conditions.

-During cnc machine installation

How many day are included (training days and not training+installation+adjustement+repairing). If it is your first cnc machine or a really different cnc machine it could be interesting to cut the training in several waves to better "digest" the informations.

It is better to have the training in your workshop with your machine, instead of the supplier's office.

-During the first months after cnc machine arrival.

An operator, even efficient needs several month to control a cnc machine

 

-Repairing

The main problems which stop a cnc machine in the beginning are due to operator's mistakes in programming.

It is decisive to have a quick and efficient assistance by phone from the cnc machine supplier to  discover the mistake and start again the machine.

You have to understand how the assistance supplier is organized (how many field technicians, how many office technicians, how many machines installed in your market..). It is decisive to have minimum one technician in office to answer and to solve these problems by phone.

A lot of suppliers for cnc machines for stone are small.

 

-Options

List of options available during machine purchase and also after purchase.

These options and the technical solutions (for example to carry out the slanted planes for kitchen top) are going to help you to choose the right machine.

 

 

 

-Programming

Be careful. The supplier's technicians doing the demonstrations are often choosen because they have a big experience and know very well the software. They have to impress the potential customer about how the software is easy to use.

 

-Loading, unloading, machine preparation...

You have to be very careful on the compulsory operations before the machine working. This times when the machines does'nt work, cost. The shorter there are the better will be your productivity.

-loading, unloading

-Work from template

-Wheel wearing adjustement

-....

 

-Using and maintenance costs

-hourly technician cost

-trip technician cost

-closed network for water or not.

 

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