Process, apparatus and system for creating extruded material having color effects and products made with extruded material created with same
A process and associated system for creating color effects using extrudable material, such as plastic and metal for example, are presented. Flows of first and second viscous materials of respective colors are provided and then combined in a predetermined pattern to form a stream of combined viscous material. A dynamic mixer is the then used to apply a predetermined dividing, overturning and combining motion to the stream of combined viscous material to partially mix the first viscous material and the second viscous material, such that upon exiting the dynamic mixer, the first material of the first color and the second material of the second color form a color pattern in the stream of combined viscous material. The dynamic mixer has elements configured for acquiring a specific radial orientation in a range of radial orientations that may be varied during the application of the dividing, overturning and combining motion to the stream of combined viscous material to cause variations in the color pattern in the stream of combined viscous material. Sheets of extruded material may be created using such process and system and used in the manufacturing of many different products including, but not limited to, kayaks, stand-up paddle boards, garden furniture and many others. In some embodiments, the sheets may be characterized by color bands extending diagonally with reference to a longitudinal extent of the sheet.
1. A system for creating color effects using extrudable material, the system comprising:
a) a first extruder for providing a flow of a first viscous material of a first color;
b) a second extruder for providing a flow of a second viscous material of a second color different from the first color;
c) a feed block for combining the flow of the first viscous material and the flow of the second viscous material to form a stream of combined viscous material, the stream comprising a first band of the first color and a second band of the second color, the second band being adjacent to the first band;
d) a dynamic mixer for applying a dividing, overturning and combining motion to the stream of combined viscous material to partially mix the first viscous material and the second viscous material, such that upon exiting the dynamic mixer, the first material of the first color and the second material of the second color form a color pattern in the stream of combined viscous material, wherein the dynamic mixer has elements configured for acquiring a specific radial orientation in a range of radial orientations;
e) an electronic controller in communication with the dynamic mixer, the electronic controller being configured for varying the specific radial orientation of the elements of the dynamic mixer by performing clockwise and counter-clockwise rotations of the elements of the dynamic mixer during the applying of the dividing, overturning and combining motion to the stream of combined viscous material to cause variations in the color pattern in the stream of combined viscous material to form an extruded material having a surface that presents color gradation effects having an undulating color pattern oriented along a longitudinal extent of the extruded material.
2. The system as defined in claim 1 , wherein the electronic controller is configured for varying the specific radial orientation of the elements of the dynamic mixer at least in part by causing a rotation of the elements of the dynamic mixer by a pre-determined amount to vary the specific radial orientation of the elements of the dynamic mixer during the applying of the dividing, overturning and combining motion to the stream of combined viscous material.
3. The system as defined in claim 2 , wherein the electronic controller is configured for causing the rotation of the elements of the dynamic mixer by the pre-determined amount to be performed repeatedly over time during the applying of the dividing, overturning and combining motion to the stream of combined viscous material.
4. The system as defined in claim 1 , wherein the electronic controller is configured for varying a rotational position of the dynamic mixer over time at least in part by causing the rotational position of the dynamic mixer to vary substantially continuously over a time interval between a first rotational position threshold and a second rotational position threshold.
5. The system as defined in claim 4 , wherein the electronic controller is configured for altering at least one of the first rotational position threshold and the second rotational position threshold in order to cause variations in the color pattern in the stream of combined viscous material.
6. The system as defined in claim 5 , wherein the electronic controller includes a control interface configured for receiving control commands from a user, the electronic controller being modifying at least one of the first rotational position threshold and the second rotational position threshold at least in part based on the control commands provided through the control interface.
7. The system as defined in claim 1 , wherein the electronic controller is configured for causing a rotation of the dynamic mixer at a rotational speed that is constant for at least part of a time during which the dynamic mixer applies the dividing, overturning and combining motion to the stream of combined viscous material.
8. The system as defined in claim 7 , wherein the rotational speed of the dynamic mixer varies over time during the applying of the dividing, overturning and combining motion.
9. The system as defined in claim 7 , wherein the electronic controller is configured for setting the rotational speed of the dynamic mixer at least in part by processing control commands provided by a user over a control interface.
10. The system as defined in claim 1 , further comprising a die for receiving the stream of combined viscous material, the die being configured for forming the stream of combined viscous material into a sheet.
11. The system as defined in claim 1 , further comprising:
a) at least one additional extruder for providing at least one additional flow of a third viscous material; and
b) a combining device for combining the stream of combined viscous material released by the dynamic mixer with the at least one additional stream of third viscous material provided by the at least one additional extruder.
12. A system as defined in claim 11 , wherein the combining device forms a co-extruded stream having at least two layers.