100 years for the Charles Costa mirror shop

 

 

 

For 100 years, each of the 4 generations has seen their father invest in the Charles Costa business, without counting his time, deploying a lot of effort and always with passion

 

We are happy to celebrate this year the extraordinary anniversary of our centenary.

 

Be sure that the satisfaction of our customers will always remain at the heart of our priorities as well as the respect of commitments with our partners.

 

I join with all my colleagues in presenting to you our best wishes for health, success and serenity for this new year 2020.

 

 

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Sarthe. L’entreprise Grav’Or ce week-end à l’Élysée

L’entreprise mancelle de gravure sur verre, fait partie des 100 entreprises sélectionnées pour l’exposition « Fabriqué en France » qui se déroule les 18 et 19 janvier 2020 à l’Elysée.

Les samedi 18 et dimanche 19 janvier 2020, 100 entreprises françaises – sélectionnées parmi 1 750 dossiers – présenteront le savoir-faire « Fabriqué en France » de 100 départements français, à l’Élysée. L’entreprise mancelle Grav’Or a été retenue pour représenter la Sarthe.

Nommée aux Talents de la Sarthe 2018 dans la catégorie « entreprise », la société de miroiterie et décoration sur verre présentera ce week-end un paravent avec gravure à la main, feuille d’or et laquage en églomisé précise le site de l’Élysée.

 

Convergence of machines for stone and glass

The arrival of industrial synthetic materials on the stone market has surprising consequences on the machinery market. In fact, we see appearing from certain suppliers who are both on the glass and stone market on the stone machinery market, machines that were once exclusively used on the glass market.

 

Mainly for two reasons.

 

1 / These new materials are calibrated in thickness.

So we see machines appearing for polishing the edge (Bavelloni, Intermac, Bovone) similar to those used for glass (rectilinear, double edger).

 

The gain is much better productivity for running in and polishing the edge.

 

2 / Some materials are based on glass

 

We are witnessing the arrival of cutting systems from glass much more productive and easy to use (cutting tables, at Bavelloni, Intermac ...)


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Miroiterie en vente

 

Perspective départ en retraite une miroiterie de façonnage avec activité menuiserie aluminium et PVC est disponible à la vente.

L'entreprise dont le dirigeant est très connu et présent  sur le marché depuis de nombreuses années  possède un parc machines diversifié et est située dans une ville importante du Sud-Ouest.

Parc machines avec table de coupe, rectiligne, perceuse, machine à bandes...

Equipes de poseurs indépendants.

 

Pour plus d'informations glass@comascotec.com ou 06 64 73 63 77. Merci

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Glass tempering furnaces

 

1/Introduction

There are to main reasons for glass tempering

To harden the glass surface

To prevent, in case of glass breaks, to have very dangerous big pieces of broken glasses

 

A/Different glass tempering

There are 2 different glass tempering but only one( the thermic one) reaches the 2 targets

Chemical tempering

Thermic tempering

 

1/The chemical tempering

The glass is dived inside heated salts bath. The bath chemical composition depends on the type of glass. The target is to introduce at the glass surface more important dimensions cations from the salt bath, to replace the smaller ones which are already inside the glass. This is possible thanks to the temperature increase (more than 400 degrees Celsius) which allows to the cations to move.

During the cooling the cations movement stops and the biggest are kept in a smaller space than the one they normally need. So they are going to take more space and to harden the glass surface.

Moreover the surface is going to be in compression and increase the glass resistance to break.

But if the glass breaks the big dangerous glass pieces remain.

The chemical tempering is used for glass less than 5 mm thickness.

 

2/The thermic tempering

The idea is the same, to put the glass surface in compression. But a thermic way is going to be used.

The glass is heated( more than 600 Celsius degrees) in an oven for a time depending the glass thickness (between 1 and 15 minutes). And quickly cooled down (with air under pressure).

The surface quickly cooled is going to be in compression and the internal part of the glass is going to be in extension

This way to temper has some advantages

The glass broke in small pieces (less than 1 cm²), so less dangerous for people

It is less expensive

It is possible to temper all kind of thicknesses

 

B/The machines for thermic tempering

-The tempering vertical ovens

The tempering oscillating horizontal ovens

The tempering continuous horizontal ovens

 

2/Oscillating horizontal tempering furnaces

There are 4 areas: loading, heating, tempering/cooling, unloading

In the loading area the operator prepares the batch and waits to introduce the glass inside the oven till the previous batch leaves the heating area.
In the heating area the glass moves continuously with oscillation on rolls to prevent deformations.

When the temperature required is reached the rolls exit quickly the glass from the heating area to the tempering area where under high pressure air is sent on the surface.

In the same time a new batch is introduced inside the heating area.

When the glass, in the tempering area, reaches the right temperature to be manually unloaded it is driven to the unloading area where operators unload the glass.