A stretcher produced using rotomoulding technique, filled with PU foam. A rescue equipment near the beach.

1. BEACH STRETCHER
A Project by
Alexandre Calvario, Chhavi Jatwani,
Henrique Guedas, Nino Marta,
Shreya Kumar
Corso di sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta

2. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Brainstorming & scenario building
DIE-CAST
METAL TUBE BENDING
ROTATIONAL MOLDING
METAL ALLOY
POLYMERS
RESINS
THERMOMOLDING
TECNOLOGY MATERIAL SCENARIO PRODUCT
TEMPORARY SETTLEMENT
MOTION HANDICAP
SAFETY EQUIPMENT
RESCUE EQUIPMENT RESCUE PLATFORM
STRETCHER
SPORTS KAYAK SKATE
BOARDS MULTI SPORTS
UNDERWATER SCOOTER
WHEEL CHAIRS
PROSTHESIS
HELMETPADS
CHEST HARNESS
REMOTE AREA AGRICULTURE SEED BOMBS
3RD WORLD COUNTRY
(BELOW POVERTY LINE)
SCHOOL FURNITURE
SCHOOL STRUCTURE
SANITARY NEEDS
SHELTERS/TENTS

3. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Initial ideas

4. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Initial ideas

5. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Beach stretcher
CONCEPT
The Beach stretcher is a design for a stretcher that is used for rescue at beaches. and near water
bodies. It is also houses the Rescue ring.
TECHNOLOGY
The Rotomolding technology is used to produce hollow structures. The Beach stretcher is designed to
be used in case of accidents near the water. Therefore to facilitate floating it is produced as a foam
filled object using the rotomolding technology.
MATERIAL
This product is made out of medium density polyethylene(MDPE) filled with polyurethane foam.
PE is one the most widely used polymers in the industry. The long hydrocarbon chain structure makes it
suitable for various industrial uses. In case of our product it provides a reasonable amount toughness
and excellect chemical resistance. Polyurethane foam further adds strength to the design and is also
the best material for flotation. The life buoy’s are filled with polyurethane foam

6. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Scenario

7. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Development sketches

8. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Development sketches

9. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Working
The stretcher fits snuggly
into a grove on the base.
2. It snap fits from the top.3. The way it looks when
not in use
4.The base stand when the
stretcher is in use.
1.

10. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Working
5. Just slide out the Lifebuoy from
either side when required.

11. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Ergonomic considerations
The Rescue ring hangs at a comfortable
height of 1200 mm from the ground
1.
1200 mm
Designed to contain a person with average dimensions.
height 180 cm
shoulders 48cm
2.
180 cm
48 cm

12. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Ergonomic considerations
The weight is divided
between three persons.
3. The handle is designed to
fit both hands if needed.
5.The distance between the
two handles is 90 cm.
4.

13. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Technical considerations
Interior or the stretcher is filled with polyurethene
foam in order to make it float
2. Supports all standard sizes of the rescue ring3.All corners have a radius of 9 mm. The minimum
radius for the product to leave the mold
being 4.5 mm
1.
9 mm
9 mm
710 mm 620 mm 500 mm590 mm

14. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Material study
POLYETHYLENE
PRIMARY OBJECTIVE | Light, strong, durable, Economical to fabricate and install
SECONDARY OBJECTIVE | Non-corrosive, Weather resistant, No warping or splinters
POLYURETHANE FOAM
Expanding rigid urethane is a closed cell pourable foam. It can be poured in multiple layers.
PRIMARY OBJECTIVE | Flotation
SECONDARY OBJECTIVE | It resists the absorption of water. Used to fill voids.

15. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Production storyboard
MOULD A
MOULD B
MOULD A
MOULD B
MOULD A
MOULD B
MOULD A
MOULD B
The powdered form of the polyethylene
Plastic is poured into the mould
The MOULD A is then closed on
MOULD B tightly so that there is no
outlet for the plastic matter during
the Rotational process
4.A two part stretcher is build,
one with a negetive
and one with a positive
cavaty to make the stretcher
Heat is then applied to the moulds. In
this process the plastic starts to melt
inside the shape of the Mould
3.2.1.

16. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Production storyboard
MOULD A
MOULD B
MOULD A
MOULD A
MOULD B MOULD B
After heat is applied to the moulds, they
are made to Rotate on 1 or 2 differen
axis’s at a certain speed. This process is
referred to as ROTATIONAL MOULDING
By the time the Rotation stops the
melted plastic spreads thoroughly
around the walls of the entire mould.
Taking the shape of the mould It is
then cooled and becomes Hard
Plastic.
The moulds are seperated and the
product left is the shape of the
moulds - The Stretcher.
FINAL STRETCHER5. 6. 7. 8.

17. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Production storyboard
Stretcher after rotomoulding production
with empty void - without Polyurethane.
Foam in form of liquid is poured
through a hole into the hollow
stretcher.
Liquid foam, takes about 5 min to
expand and solidify and take the
form of the hollow stretch.
Once the foam is filled up
into the stretcher, its ready
for use.
9. 10. 11. 12.

18. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Technical drawings
STRETCHER

19. 315
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566
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640
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facoltà del design
page nº
students:
date: scale:
componets:
name of project:
Calvário Alexandre; Guedes Henrique; Jatwani
Chhavi; Kumar Shreya; Marta Nino
BEACH STRETCHER
Stretcher
Corso di Sviluppo Prodotto
Sezioni P2
2011-2012
Prof: Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta 02/07/2012 1:10
01

20. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Technical drawings
LIFE BOUY STAND

21. 39
177
7868
500
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30
170
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555
10
90
DETAIL
SCALE 1 : 5
40
DETAIL
SCALE 1 : 5
facoltà del design
page nº
students:
date: scale:
componets:
name of project:
Calvário Alexandre; Guedes Henrique; Jatwani
Chhavi; Kumar Shreya; Marta Nino
BEACH STRETCHER
Base
Corso di Sviluppo Prodotto
Sezioni P2
2011-2012
Prof: Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta 02/07/2012 1:10
02

22. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Renderings

23. Politecnico di Milano
Scuola del design
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Renderings

24. Montage
Corso di Sviluppo prodotto
Sezione P2
A.A. 2011-2012
Docenti
Francesco Zurlo, Valentina Rognoli,
Antonio Armillotta
Project by
Alexandre Calvario, Chhavi Jatwani, Henrique Guedas,
Nino Marta, Shreya Kumar
Politecnico di Milano
Scuola del design

25. THANK YOU
for your attention.