EP4067598A1

EP4067598A1 - Panel for thermal insulation

Info

Publication number: EP4067598A1
Application number: EP21020426.9A
Authority: EP
Inventors: designation of the inventor has not yet been filed The
Original assignee: Prespaglia Srls
Current assignee: Prespaglia Srls
Priority date: 2021-03-30
Filing date: 2021-08-25
Publication date: 2022-10-05
Also published as: IT202100007919A1

Abstract

The present invention relates to a panel (1) for thermal insulation consisting in a screed containing straw, lime, clay, pozzolan and water which has preferred dimensions that are equal to 50 cm x 50 cm x 10 cm, and a weight that is equal to 25 kg and the net dry density is equal to 554 kg/m³ and the thermal conductivity is equal to 0,0823 W/(mK) and its proceeding for manufacture.

Description

Of the patent for industrial invention entitled: "Panel for thermal coat" on behalf of Prespaglia Italia Srls, electively domiciled at the law firm of lawyer Pierluigi Cornacchia, Via Principi di Savoia, 67 - Lecce.

Field of the technique

The present invention relates to a method of thermal and/or acoustic insulation of a housing structure. In particular, it relates to an ecological prefabricated element where also the realization process is eco-sustainable in line also with CAM (minimum environmental criteria).

Noted art

The state of the art reveals that the current methods of thermal insulation of housing structures provide for the need to create buildings with good performance of energy efficiency, low environmental impact and with an acceptable benefit also in terms of health and not only environmental. As a result, there is great industrial interest in finding economic solutions, in terms of cost-benefit and not only that provide environmentally sustainable building products throughout the construction process. The traditional method of making bricks or walls does not take into account the healthiness of indoor and even outdoor environments and their "weight" in terms of ecological footprint. The state of the art in reference to the present buildings shows, moreover, that they are unreliable in terms of guaranteeing the transmittance prescribed in correlation to the construction process to realize them as well as having a realization system quite energy-consuming.
With reference to the state of the art emerge industrial patents such as "102013902219329 - PREFABRICATED INSULATION PLATE FOR A WALL STRUCTURE, WALL STRUCTURE INCLUDING SUCH PLATE" or "102014902273933 - MULTISTRATE INSULATING PANEL, IN PARTICULAR FOR USE IN THE INSULATION PLATE COATING OF BUILDINGS". However, such patents and others, even though they boast technical advantages, have in no way devised the use of natural raw materials like the present invention, nor is the construction process to be considered as being based on the same modus operandi as the present invention.

Description of the invention

The present invention deals with a panel made of decorticated and dedusted straw, hydraulic lime, clay and pozzolan. It has thermal, acoustic and hygrometric comfort, as well as being permeable to water vapor, that is, it is breathable and resistant to frost, insects and rodents, and finally it has a reduced amount of CO2 emissions during manufacture, since it adopts a so-called "cold" process. The panels are laid by gluing them to the existing wall using suitable glue and dowels. The cut can be made by manual or electric saw and the walls, finally, can be covered with a natural network and plastered. This panel is ideal for use as a thermal coat for exteriors to be superimposed on the facades of existing buildings and that require an intervention of energy efficiency. Thanks to its characteristics, it guarantees high thermal insulation performance both at low and high temperatures.
It should be noted that this component of green building has an enormous versatility, in fact, can be easily used for the construction of walls in all structures, where the structural elements are made of wood, steel or reinforced concrete. Its main function is to make external perimeter walls of a building. However, it can be suitable not only for external plugging but there is the possibility to use it also to realize internal masonry, in this case it is necessary to add a layer of plaster for internal use.
This finding also follows and complies with the requirements of UNI EN 12664:2002 dated 01/02/2002, namely "Thermal performance of building materials and products. Determination of thermal resistance by the hot plate method with guard ring and by the thermo-flowmeter method. Dry and wet products with medium and low thermal resistance".
The panel described and the relative method of realization constitute a new and inventive alternative to the state of the art, solving a series of industrial problems linked to the reliability and speed of assembly of the panels themselves as well as the guarantee of having natural materials that strongly reduce the environmental impact of the building.

Detailed description of the invention and its figures

Further features and advantages of the device according to the invention will become clearer with the following detailed description of a form of realization of the invention, made with reference to the attached drawings, provided for illustrative and non-limiting purposes only.
The percentages of preparation of the dry mixture are by weight: Lime, clay and pozzolan between 70% and 85% while straw between 15% and 30%. The screed, to be prepared for the realization of the panels, before being inserted in the clean formworks, is spread on the internal sides, a "veil" of natural oil; the thermal screed is realized having as a percentage: dry mixture of lime, clay, pozzolana and straw that varies, in weight, between 85% and up to 95% while the percentage of the weight of water, varies accordingly, from 5% up to 15%. This panel with the doses mentioned above has a density of cured panels equal to about 554 kg/m3.
It follows that the panel shows the following characteristics:

Dimensions(cm) H 50 x L 50 x SP10
Thermal conductivity is equal to 0,0823 W/(m-K)
Volumic mass: about 554 kg/m3
Specific gravity: about 25kg

Figure 1 shows the perspective view of the panel that has an area of about 0.25 m2 (50cm x 50 cm) while the thickness can vary from 5 cm up to 20 cm.
Figure 2 illustrates the production process including the following stages:

Mixing of materials (straw, lime, clay, pozzolan and water)
Insertion of materials in the formwork
Formwork vibration for air removal
Pressing inside the formwork
Fast drying in the oven
Formwork opening and final drying at room temperature.

The present invention has been described by way of illustration, but not limitation, according to its preferred embodiments, but it is to be understood that variations and/or modifications may be made by those skilled in the art without departing from the scope of protection thereof, as defined by the appended claims.

Claims

Panel (1) for thermal insulation consisting in a screed containing straw, lime, clay, pozzolan and water which in its preferred but not exclusive embodiment is characterised by dimensions that are equal to 50cm x 50cm x 10cm, by weight that is equal to 25 kg and by the fact that the net dry density "
" is equal to 554 kg/m³ and the thermal conductivity "λ" is equal to 0,0823 W/(m·K).
Panel according to the preceding claim, characterised by the fact that the dosage percentage of the dry blend is realised by weight: lime, clay and pozzolan stand between 70% and 85% while straw stands between 15% and 30%, thus the weight of the dry blend composed by lime, clay, pozzolan and straw varies between 85% and up to 95%, while the percentage of the water weight stands between 5% and up to 15%.
Proceeding for the realisation of a panel for thermal insulation according to the preceding claims, characterised by the fact that, once the screed (2) is amalgamated to the point that it reaches a uniform plasticity level, it is poured into a steel container that shows only one lateral opening, and on whose inner surface a superficial layer of natural oil is blended before the pour, and subsequently, the product resulting from the pour is extracted from the container within 48 hours and stored at room temperature, protected by climate factors, until the aging is completed.
Proceeding for the realisation of a panel according to the preceding claims, characterised by the fact that the final drying at room temperature allows to obtain a panel including net dry density "
" approximately equal to 554 kg/m³ e thermal conductivity of the dried material "λ" approximately equal to 0,0823 W/(m·K).