METHOD FOR IMPROVING BEHAVIOUR OF A MUSEUM DISPLAY CASE WITH RESPECT TO OBJECTS EXHIBITED THEREIN

Abstract

In order to improve the behaviour of a museum display case towards objects exhibited therein, the display case is subjected to a heat treatment in which the museum display case is maintained at a treatment temperature for a treatment time. The treatment temperature is between 35° and 50° and the treatment time is at least 30 hours. In this way, the emission of harmful volatile substances, including VOCs (volatile organic compounds), is drastically reduced and consequently the objects displayed in the display case are not at risk of damages due to the presence of these volatile substances in the display case.

Claims

1. A method for improving behaviour of a museum display case with respect to objects exhibited therein, wherein the display case has parts facing an interior exhibition space which are made of materials having a tendency to emit harmful volatile substances, the method comprising the step of subjecting the display case to a heat treatment in which at least said parts of the display case made of materials having a tendency to emit harmful volatile substances are subjected to a treatment temperature for a treatment time, wherein the treatment temperature is between 35° and 50° and the treatment time is at least 30 hours.

2. The method according to claim 1, wherein the treatment temperature is between 35° and 45°.

3. The method according to claim 1, wherein the treatment time is at least 35 hours.

4. The method according to claim 3, wherein the treatment time is not more than 100 hours.

5. The method according to claim 1, wherein the heat treatment is performed by placing the assembled display case in a treatment chamber.

6. The method according to claim 1, wherein the heat treatment is performed by placing heating members in the display case.

7. The method according to claim 6, wherein the heating members heat the parts of the display case made of materials having a tendency to emit harmful volatile substances by convection and/or radiation.

8. A method for manufacturing a museum display case comprising an interior exhibition space, comprising the steps of: assembling a display case structure using -in parts of the display case facing the interior exhibition space- materials having a tendency to emit harmful volatile substances; and subjecting the display case structure to a heat treatment in which at least said parts are subjected to a treatment temperature for a treatment time, wherein the treatment temperature is between 35° and 55° and the treatment time is at least 30 hours.

9. The method according to claim 8, wherein the treatment temperature is between 35° and 45°.

10. The method according to claim 8, wherein the treatment time is at least 35 hours.

11. The method according to claim 10, wherein the treatment time is no more than 100 hours.

12. The method according to claim 8, wherein the heat treatment is performed by placing the assembled display case in a treatment chamber.

13. The method according to claim 8, wherein the heat treatment is performed by placing heating members in the display case.

14. The method according to claim 13, wherein the heating members heat the parts of the display case made of materials having a tendency to emit harmful volatile substances by convection and/or radiation.

Description

BRIEF DESCRIPTION OF THE FIGURE

[0020] FIG. 1 shows a museum display case in accordance with the present disclosure.

DETAILED DESCRIPTION

[0021] In the drawing of FIG. 1, a museum display case 10 is schematically shown, which comprises a base 20, surmounted by a box 30. In the box 30, there is the exhibition space of the display case 10, destined to accommodate the objects to be exhibited, while in the base 20 there is a technical space for housing the systems for the control of the atmosphere inside the box 30 (for example, a simple container with hygroscopic material or a more complex air conditioning and/or filtering system).

[0022] The box 30 comprises a frame 31, typically made of steel, aluminium or another metal material. The box 30 then comprises glass walls mounted on the frame 31, in particular fixed glass walls 32 and at least one openable glass wall 33. The fixed glass walls 32 are welded to each other, to the frame 31 and to the base 20 by bonding, using an adhesive substance (not highlighted in the figure). The openable glass wall 33 is mounted on the frame 31 by means of an openable system, for example a hinge system (not visible in the figure). It should be noted that the frame 31 may be eliminated, either completely or in part, leaving the fixed glass walls 32 - suitably sized and welded together - with the function of load-bearing structure of the box 30; in this case, the openable glass wall 33 is mounted on one or more of the fixed glass walls 32.

[0023] The display case 10 further comprises sealing gaskets 36, both between the openable glass wall 33 and the fixed glass walls 32, or between the openable glass wall 33 and the base 20.

[0024] In the display case 10, the material of the sealing gaskets 36 has a tendency to emit harmful volatile substances, in particular VOCs. This material is for example a silicone rubber, another elastic material or plastoferrite; the latter material combines excellent elasticity with the possibility of being magnetized, so that the openable glass wall 33 can be closed by magnetic attraction.

[0025] The adhesive substance with which the fixed glass walls 32 are welded and sealed is also a material that has a tendency to emit harmful volatile substances.

[0026] The display case 10 may further comprise other parts (e.g. accessories of various kinds, not shown in the figure, such as partitions, support shelves, lighting fixtures, etc.) made of materials having a tendency to emit harmful volatile substances such as VOCs or other, or painted with paints that can emit such substances.

[0027] The display case 10 is assembled in a normal way, assembling the various parts as required. Once the assembly has been completed so as to obtain the structure of the display case, without however any hygroscopic material used for moisture control being housed in the base 20 of the display case 10, the display case 10 is subjected to a heat treatment to dispose of harmful volatile substances from the materials having a tendency to emit them.

[0028] For this purpose, the display case 10 may be placed in a treatment chamber, where it is maintained at a predefined treatment temperature for a predefined treatment time. It has been verified that if the treatment temperature is between 35° and 50°, the materials having a tendency to emit harmful volatile substances emit these substances in an accelerated manner, so that - if the treatment time is at least 30 hours - at the end of the heat treatment these materials have substantially exhausted the ability to emit harmful volatile substances, at least under the normal conditions of use of the display case 10. On the other hand, temperatures in this range are not such as to damage the parts of the display case.

[0029] Alternatively and preferably, heating members are placed inside the display case 10 so as to maintain the internal parts of the display case 10 at the predefined treatment temperature for the predefined treatment time. The heating members may act by convection, heating the air inside the display case 10, and/or by radiation; if the heating members act by radiation (or both by convection and radiation), they are placed so as to direct the radiation towards those parts of the display case 10 in which the materials having a tendency to emit VOCs or other harmful substances are located.

[0030] This method allows the display case 10 to be treated even at the installation site and is therefore preferred when the display case 10 (e.g. due to its large size) has to be assembled at the installation site.

[0031] During the heat treatment, by whichever method this is performed, a change of air is periodically performed in the interior exhibition space of the display case 10, for a duration of at least 5 minutes every hour.

[0032] Preferably, the treatment temperature is between 35° and 45°; even more preferably, it is around 40°. Preferably, the treatment time is at least 35 hours.

[0033] In order to verify the effective elimination or reduction of the harmful volatile substances, the concentration value of the harmful volatile substances in the air inside the display case 10 is measured during and at the end of the heat treatment using a per se known equipment.

[0034] Once the heat treatment has been completed, any hygroscopic material may be housed in the base 20 of the display case 10, in a manner known per se.

[0035] The display case 10 treated in this way can therefore be used safely, because the materials used therein which have a tendency to emit harmful volatile substances have exhausted their emission ability, or rather they have reduced it in such a way that they can still emit such substances, but only in a minimal quantity, such that it is not dangerous for the objects exhibited in the display case 10.

[0036] Depending on the intended use of the display case 10, i.e. depending on the ability of the objects exhibited to be damaged by VOCs or other volatile substances, it may be necessary to use higher or lower temperatures and treatment times to ensure that at the end of the heat treatment the display case 10 is completely safe, i.e. that the objects exhibited cannot be damaged.