Method for producing a decorative object from at least one extruded bead layer
A method for producing a decorative object from at least one extruded bead layer, including a step of passing a polymer-based composition into an extrusion die, the extrusion head controlled by a control element to follow a continuous trajectory intended to form the decorative object in one layer, the control element controlling a variation in the speed V of movement of the extrusion head on the basis of a variation in the trajectory of the extrusion head by an angle α and, at a distance D from a change in angle α, the continuous trajectory of the extrusion head complies with the following equation, for each of the layers forming the decorative object, where appropriate: D=a+(b×V c )+(d×α) where a, b, c and d are constants.
1 . A method for producing a decorative object from at least one layer of an extruded bead of a polymer-based composition, comprising a step of:
passing a polymer-based composition into an extrusion die from a feed inlet of said extrusion die to an extrusion head from which an extruded bead of said composition comes out, the extrusion bead being deposited on a receiving support by gravitational effect;
wherein the extrusion head is controlled by control means to follow a continuous trajectory intended to form said decorative object in one layer, said control means controlling a variation in a speed V of movement of the extrusion head on the basis of a variation in the trajectory of the extrusion head by an angle α; and
wherein, at a distance D from a change in angle α, the continuous trajectory of the extrusion head complies with the following equation, for each of the layers forming the decorative object:
D
=
a
+
(
b
×
Vc
)
+
(
d
×
α
)
where a, b, c and d are constants according to the following values:
a=10.6±10%,
b=2.76 −05 ±10%,
c=2.72±10%, and
d=−0.08±10%,
where D is expressed in millimeters, V is expressed in millimeters per second, and α is expressed in degrees.
2 . The method according to claim 1 , wherein the constants a, b, c and d are expressed according to the following values:
a=10.6±5%,
b=2.76 −05 ±5%,
c=2.72±5%, and
d=−0.08±5%.
3 . The method according to claim 2 , wherein a robotic arm, controlled by the control means, includes a means for storing a volume of the polymer-based composition as well as means for transporting said polymer-based composition to the extrusion head.
4 . The method according to claim 3 , wherein the extrusion die is mounted at one end of the robotic arm.
5 . The method according to claim 3 , wherein the extrusion die is mounted at a distance from the robotic arm such that only said extrusion head is moved to follow the continuous trajectory.
6 . The method according to claim 1 , wherein the polymer-based composition comprises a polymer matrix including at least 70% by weight of acrylonitrile butadiene styrene (ABS), polylactic acid (PLA polyester), polycarbonate (PC) or Polyethylene terephthalate (PET).
7 . The method according to claim 1 , wherein the speed V of the extrusion head is based on a flow rate output extruded by the extrusion die.
8 . The method according to claim 1 , wherein the extruded bead comes out of the extrusion head with an output between five and fifteen kilograms per hour.
9 . The method according to claim 1 , wherein, at an outlet of the extrusion head, the extruded bead has a viscosity between 400 Pa·s and 450 Pa·s, defined as per the ISO 11443 standard.
10 . The method according to claim 1 , wherein, at an outlet of the extrusion head, the temperature of the extruded bead is between 160° C. and 260° C.