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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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DIGITAL PRINTING MACHINES

 

Introduction

 

The glass surface embellishment started  very fast after this material discovering. The engraving, the sandblasting are very old technologies. After came screen printing. No immediately on glass ( Screen printing started first in Japan to carry out kimonos). 10 years ago, directly from wood industry arrived roller coating machines able to produce  colored glass.

 

Few years ago

2004, Glasstec Dusseldorf. In a corner was a small booth, where a new company, DIP, introduced a printer able to print drawings or texts on a flat glass surface. At this step there was only 2 “colors” available: white and black. The booth was full during all the exhibition. Iit was a revolution because? for the first time, directly from a computer there was the possibility to draw everything on a glass surface in a very short time, with very good quality and low cost.

Why this technology arrived so late to glass industry, when it is already used for years on other markets? ( hollow glass, wood, leather, textile, plastic…).

Mainly for 2 reasons.

-The first one is the market size. The flat glass market is only few percents in touch with wood market.

-The second one is the glass surface characteristics : it is not easy to print on glass because

-The wet repulsion

-The surface smoothness

-The stiffness

These problems were solved by special inks design in addition with a treatment to fix the ink on or inside the glass ( but it is only the beginning and a lot of companies are working to improve the inks).

 

The machine

The machine is a printer with a table to support the glass and a printing head moving on X and Y and a small CNC to manage the printing parameters.

How are the machines working? Like an usual color printer. You work on a computer with a drawing software and the CNC drives the printing head to print directly on glass what you have designed on your computer. No need to have a skilled operator.

After printing, depending the products, you have to do a supplementary step ( UV, heat treatment…) to fix the printing on or inside the glass.

 

The inks:

The inks are a critical point. There are several  types, UV inks, ceramic inks, organics inks, nano-components inks….. The ink type is strongly connected with the product end use

UV inks: the inks components can crosslink under a UV lamp forming a film on the glass surface. The quality is good and very well scratch resistant especially from dust. But the film formed by UV lamp is only on the glass surface and with sun, water  or cleaning action tends to detach after some time.  There are mainly organic inks. They don’t contain heavy metals or solvents. There are polymers and the chemical reaction is initiated by the UV lamp. But new UV inks are going to be introduced on the market, with an hardener able to improve the film resistance

Ceramics inks: It is a mixing of ground glass or ceramic plus organic or inorganic pigments. The print can be done directly on the glass or on a substrate and after transferred on the glass.  During the high temperature treatment after printing, the small particles melt on the glass surface top. Here also the inks are in development, but more and more colors are available. The heat treatment can lightly change the colors.

Organics inks

-With solvents

The solvent help during printing and evaporate during the following step. Very often an hardener is present inside the mixture.

 

EVA for laminated glass : in this case the digital printer print directly on EVA film with special inks ( nano-componants  ink ). You feed the digital printer with EVA roll ( up to 2,5 meters  width) with vacuum system to guarantee the perfect planetary during printing, and sensors to manage the material thickness.

 

The markets

Glass digital printing machines really are creating new markets for flat glass

Digital printing on glass offers  huge possibilities to introduce on the market very innovative products and solution with low costs.

For example: Gaming machines, advertising and communication, architectural, furniture, appliance; automotive…. . But the requirements are very different.

Gaming machine: For the screen, the keyboard…  The inquiries are for water and alcohol resistance inks , few colors and transparence.

Advertising and communication

Mr Chiara, sales manager, from the Italian digital printer supplier Muchcolors explains

“Now it is possible to use glass as a paper sheet of our color office printer. Imagine what could happen if you choose a whatever  image and if you could launch the printing command on your printer and you have in few minutes a glass panel with the image on it? It is a new and easy way for marketing adv. It is a new way to customizing interior for shops, buildings, exhibitions. It is the way to give a new dress to the ancient transparent glass. Now you can use your glass as a publicist use  paper”

There are huge opportunities here for advertising campaigns ( during exhibitions, promotions, gifts, open days…), inside decoration shops ( with possibility to change fast and cheaply the decoration for a continuous animation inside the shop to attract and interest customers) or office ( reception area to promote the company image or products, partition walls.), to build attractive and original booths for exhibition. For all these “shorts terms” products UV inks are the right solution.

Architectural : all the screen printing can be competed by digital printing. For outside applications ceramics inks are often the proper answer.

Appliance: digital printing is a good answer to the market trend to colored products

 

The companies specialized in sandblasting can have here a perfect supplementary products to propose to their present customers

 

Comparison with screen printing:

The screen printing is not going to disappear but with digital printing:

-You don’t need special and specifics tools ( screens, stencils ), no storage ( square meters), no maintenance.

-You can supply the products required by your customer in a very short time ( you design on your computer , you print, you fix the printing)

-You don’t need skilled operators

-You can work directly from the digital files supplied by your customers

-You print multi-colors in only on time

-the cost are very low because there is not waste material, no cleaning operations, very low ink consumption ( about 10 g per square meter)

 

Conclusion:

Every company present on glass processing must have a look on this new technology because it is a great opportunity to develop the glass use for new markets with innovative products.

The recent regulations about chemical products ( no heavy metal or solvent), the environmental impact and the market inquiry for short term delivery and customized  batches introduce a hard competition for the different process and inks available on digital printing market. The UV inks, if the scratch resistance and film durability are improved seems to be some steps ahead because the low temperature and fast curing and there are free of heavy metal and solvents.