CA2119966A1 - Method and apparatus for surface treatment of extruded pvc - Google Patents
Method and apparatus for surface treatment of extruded pvcInfo
- Publication number
- CA2119966A1 CA2119966A1 CA 2119966 CA2119966A CA2119966A1 CA 2119966 A1 CA2119966 A1 CA 2119966A1 CA 2119966 CA2119966 CA 2119966 CA 2119966 A CA2119966 A CA 2119966A CA 2119966 A1 CA2119966 A1 CA 2119966A1
- Authority
- CA
- Canada
- Prior art keywords
- paint
- polyvinyl chloride
- pvc
- extruded
- painted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
A method and apparatus for producing painted extruded polyvinyl chloride having a composite surface structure is disclosed. The method comprises the steps of extruding the polyvinyl chloride; then spraying the extruded polyvinyl chloride with paint; then drying the painted extruded polyvinyl chloride; and finally cutting the dried painted extruded polyvinyl chloride into predetermined lengths. The apparatus comprises a polyvinyl chloride extruding device; a paint source; a paint sprayer connected to the paint source for spraying paint onto the extruded polyvinyl chloride; a drier for drying the painted extruded polyvinyl chloride; and a cutting device for cutting dried painted extruded polyvinyl chloride.
Description
2 ~
Title: Method and Apparatus for Surface Treatment of Extmded PVC
Inventors: Eugene Iacobelli BACKGROUND OF THE INVENlION
S Field of the invention This invention relates to surface treatment for extruded PVC and in particular a method and apparatus for painting extruded PVC to produce a composite surface structure.
Description of the Prior Art Extruded polyvinyl chloride (PVC) has a myriad of uses. For instance extruded PVC is used for vertical blinds, horizontal blinds, venetian blinds, picture frames, shutters and construction materials such as eave troughs, moldings, baseboards, cornices, siding, door casings and window casings. For most of these applications the colour and aesthetics of the extruded PVC is important to the end user.
In the past, to change the appearance of a specific PVC product, colour was added to the PVC prio~r to it being extmded and formed into the ~mished product.
Howeve~, for many applications only certain colours are used sis~ce dark coloured PVC
tends to deform in the hot sun.
A more recent development, particularly for PVC used as blinds, has been to apply a patterned cellophane-like fflm to the PVC to produce different visual eff~cts on the PVC. In thi~ proGess the PVC is typically a light colour and the film is applied to only one side of the item. Therefore the uncoated side of the PVC produc~ can be 2 ~
positioned toward the sunl;ght and the item will tend not to deform in the sunlight.
Applying a film to the PVC however typically adds at least 50% to the pr;ce of the item and therefore is relatively costly. Also, air bubbles may be trapped between the film and the PVC and be visible.
Another recent development in PVC blinds is to manually spray paint the blinds with a variety of colours after the blinds have been manufactured. Typically, as discussed above, only one side of the blind is painted so that the light coloured side of the blind can face toward the sun and therefore the blind will tend not to deform. Spray painting the blinds provides a textured surface and colour combinations only limited by the imagination. In order to make the paint adhere to the PVC a primer must first be applied. Further, often when paint is applied by hand there will be a certain amount of overspray, that is, paint that gets on the back of the blind. This, of course, is undesirable and is difficult to eliminate without further apparatus and expense. Further because the paint is applied after the blind is finished, the paint tends to chip. The painted vertical blinds are visually appealing, however they are costly due to the manual labour required to perform the painting step.
Until the present invention there has not been a method of producing painted extruded PVC where the painting step forms part of the fabrication procedure, the paint and the PYC form a composite stMcture and the paint forms an integral part vf the extruded PVC. Further until the present invention there has not been an automated method of producing extruded PVC that have the visual appeal of painted PVC.
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SUMMARY OF THE INVENTION
The present discloses a method and apparatus for producing painted extruded PVC wherein the paint and the PVC form a composite surface structure. The method comprises the steps of extruding the PVC; then spraying the extrucled PVC with S paint; then drying the painted extruded PVC; and finally cutting the dried painted extruded PVC into predetermined lengths. The apparatus comprises a PVC extruding device; a paint source; a paint sprayer connected to the paint source for spraying paint onto the extruded PVC; a drier for drying the painted extruded PVC; and a cutting device ~or cutting dried painted extruded P51C.
Further features of the invention will be described or will become apparent in the course of the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described by way of example only, with 15 reference to the accompanying drawings, in which:
Fig. 1 is a schematic view of the process of treating extruded PVC with paint as part of the fabrication procedure forming the present invention;
Fig 2 is a diagrammatic view of the apparaéus of the present invention;
Fig. 3 is an elevational view of the paint station taken along line 3-3 in 20 Fig. 2;
Fig. 4 is an enlarged view of the paint gun;
Fig. S is an enlarged view of the paint gun similar to Fig. 4 with the paint
Title: Method and Apparatus for Surface Treatment of Extmded PVC
Inventors: Eugene Iacobelli BACKGROUND OF THE INVENlION
S Field of the invention This invention relates to surface treatment for extruded PVC and in particular a method and apparatus for painting extruded PVC to produce a composite surface structure.
Description of the Prior Art Extruded polyvinyl chloride (PVC) has a myriad of uses. For instance extruded PVC is used for vertical blinds, horizontal blinds, venetian blinds, picture frames, shutters and construction materials such as eave troughs, moldings, baseboards, cornices, siding, door casings and window casings. For most of these applications the colour and aesthetics of the extruded PVC is important to the end user.
In the past, to change the appearance of a specific PVC product, colour was added to the PVC prio~r to it being extmded and formed into the ~mished product.
Howeve~, for many applications only certain colours are used sis~ce dark coloured PVC
tends to deform in the hot sun.
A more recent development, particularly for PVC used as blinds, has been to apply a patterned cellophane-like fflm to the PVC to produce different visual eff~cts on the PVC. In thi~ proGess the PVC is typically a light colour and the film is applied to only one side of the item. Therefore the uncoated side of the PVC produc~ can be 2 ~
positioned toward the sunl;ght and the item will tend not to deform in the sunlight.
Applying a film to the PVC however typically adds at least 50% to the pr;ce of the item and therefore is relatively costly. Also, air bubbles may be trapped between the film and the PVC and be visible.
Another recent development in PVC blinds is to manually spray paint the blinds with a variety of colours after the blinds have been manufactured. Typically, as discussed above, only one side of the blind is painted so that the light coloured side of the blind can face toward the sun and therefore the blind will tend not to deform. Spray painting the blinds provides a textured surface and colour combinations only limited by the imagination. In order to make the paint adhere to the PVC a primer must first be applied. Further, often when paint is applied by hand there will be a certain amount of overspray, that is, paint that gets on the back of the blind. This, of course, is undesirable and is difficult to eliminate without further apparatus and expense. Further because the paint is applied after the blind is finished, the paint tends to chip. The painted vertical blinds are visually appealing, however they are costly due to the manual labour required to perform the painting step.
Until the present invention there has not been a method of producing painted extruded PVC where the painting step forms part of the fabrication procedure, the paint and the PYC form a composite stMcture and the paint forms an integral part vf the extruded PVC. Further until the present invention there has not been an automated method of producing extruded PVC that have the visual appeal of painted PVC.
:; . . . . . . . .
., - .: . . ~ ~ .
. :., . ,~ : , ::: .: . .
~i: : . . . . . . ..
21~9~
SUMMARY OF THE INVENTION
The present discloses a method and apparatus for producing painted extruded PVC wherein the paint and the PVC form a composite surface structure. The method comprises the steps of extruding the PVC; then spraying the extrucled PVC with S paint; then drying the painted extruded PVC; and finally cutting the dried painted extruded PVC into predetermined lengths. The apparatus comprises a PVC extruding device; a paint source; a paint sprayer connected to the paint source for spraying paint onto the extruded PVC; a drier for drying the painted extruded PVC; and a cutting device ~or cutting dried painted extruded P51C.
Further features of the invention will be described or will become apparent in the course of the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described by way of example only, with 15 reference to the accompanying drawings, in which:
Fig. 1 is a schematic view of the process of treating extruded PVC with paint as part of the fabrication procedure forming the present invention;
Fig 2 is a diagrammatic view of the apparaéus of the present invention;
Fig. 3 is an elevational view of the paint station taken along line 3-3 in 20 Fig. 2;
Fig. 4 is an enlarged view of the paint gun;
Fig. S is an enlarged view of the paint gun similar to Fig. 4 with the paint
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sprayer adjusted to apply a greater amount of paint than in Fig. 4; and Fig. 6 is a top view of a portion of a painted PVC blind painted inaccordance with the process of the present invention.
S DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings and in particular to Fig. 1, the polyvinyl chloride (PVC) extruding system of the present invention is generally indicated by reference numeral lû. The main components of the system include a PVC extruding device 12, a painting station 14, a drying zone 16, and a cutting device 18.
Extruding device 12 is a conventional device that is used to extrude PVC
in predetermined shapes.
Once the PVC is extruded paint is applied to it. In the preferred embosliment the paint is applied by a pressurized paint gun described in detail later.
Pre~erably, the paint gun is one in which the amount of paint can be varied and the amoImt of pressure at which the paint is sprayed onto the extruded PVC can be varied.
Accordingly, the parameters of the paint gun can be varied to produced a number of different visual and textural e~fects. Alternatively, a paint gun may be used in which the amount of paint sprayed on the extruded PVC and the pressure is fixed to produce a predetermined visual and textural effect.
Painting station 14 is between extrusion device 12 and drying zone 16 so that the paint bonds with the PVC before the PVC sets and the paint dries. Thus the paint and the PVC ~orm a composite sur~ace structure and the paint becomes an integral
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sprayer adjusted to apply a greater amount of paint than in Fig. 4; and Fig. 6 is a top view of a portion of a painted PVC blind painted inaccordance with the process of the present invention.
S DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawings and in particular to Fig. 1, the polyvinyl chloride (PVC) extruding system of the present invention is generally indicated by reference numeral lû. The main components of the system include a PVC extruding device 12, a painting station 14, a drying zone 16, and a cutting device 18.
Extruding device 12 is a conventional device that is used to extrude PVC
in predetermined shapes.
Once the PVC is extruded paint is applied to it. In the preferred embosliment the paint is applied by a pressurized paint gun described in detail later.
Pre~erably, the paint gun is one in which the amount of paint can be varied and the amoImt of pressure at which the paint is sprayed onto the extruded PVC can be varied.
Accordingly, the parameters of the paint gun can be varied to produced a number of different visual and textural e~fects. Alternatively, a paint gun may be used in which the amount of paint sprayed on the extruded PVC and the pressure is fixed to produce a predetermined visual and textural effect.
Painting station 14 is between extrusion device 12 and drying zone 16 so that the paint bonds with the PVC before the PVC sets and the paint dries. Thus the paint and the PVC ~orm a composite sur~ace structure and the paint becomes an integral
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part of the PVC product.
Setting and drying zone 16 is similar to that which is found in conventional PVC extrusion systems. In this zone the PVC is set and the paint is dried. The only variation from a conventional PVC system may be to increase the length or temperature
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part of the PVC product.
Setting and drying zone 16 is similar to that which is found in conventional PVC extrusion systems. In this zone the PVC is set and the paint is dried. The only variation from a conventional PVC system may be to increase the length or temperature
5 of the drying zone to ensure that the painted PVC is sufficiently dry and set.
Similarly, cutting device 18 is similar to that which is found in conventional PVC extrusion systems.
The apparatus will now be described in detail with reference to Figs. 2 through 5.
An extrusion device 20 extrudes PVC 19 in a predetermined shape. The extruded PVC is transported from station to station on a conveyor like system 21 which keeps the extruded PVC constantly moving through the system.
Painting station 14, shown in F;g. 2 includes a paint source 22, a paint gun 24 directed towards the extruded PVC 19, a paint shield 26 and a pressurized air line 28.
Paint source 22 may be a bucket of paint or any other source of paint that is available. Paint source 22 is attachecl to pressurized air line 28 to force the paint into paint glm 24. An adjustable valve 30 is attached between pressurized air line 28 and paint source 22 so ~hat the amount of air pressure applied to the paint may be varied, thereby varying the amount of paint which is forced into paint gun 24. If the pressure on 20 paint source 22 is increased the amount of paint forced into paint gun 24 is increased and the amount of paint spayed onto extruded PVC 19 is increased. Typically this will also increase the texture on the surface of the extruded PVC.
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2 ~ fi ~3 Preferably, for a multicolored look, the paint that is used is paint which maintains discrete colours and will not mix into a homogeneous colour. Alternatively, a single colour of paint may be used which produces a textured look, generally this will give a two coloured effect since the colour of the extruded PVC will be seen through the 5 applied colour.
Spray gun 24, shown in Figs 2 through 5, is attached to pressurized air line 28 through adjustable valves 32 and 34 so that the air pressure into the gun may be varied. Valve 32 controls the air pressure into the glm and is set at a predetermined level. Typically this level is determined by the paint gun manufacturer and is set so that 10 the gun functions properly. Valve 34 controls the air pressure at which the paint is sprayed onto the extruded PVC 19 as shown in Figs. 4 and 5. By varying the pressure at which the paint is sprayed onto the extruded PVC the thickness of the paint lines is varied thus changing the ove~all look and texture of the painted PVC.
The paint shield 26 is positioned relative to the paint gun 24 as shown in 15 Figs. 2 and 3. The paint shield 26 protects the work environment from paint that misses the extruded PVC 19.
Two air driers 36 blow cool air onto the extruded and painted PVC 19 to set the PVC and dry the paint.
A cutter 38 cuts the cooled painted extruded PVC into predetermined 20 lengths.
Fig. 6 shows a poItion of a cooled painted extruded PVC 19. As can be seen there are a multiplicity of lines and dots of paint. As discussed, the paint may be
Similarly, cutting device 18 is similar to that which is found in conventional PVC extrusion systems.
The apparatus will now be described in detail with reference to Figs. 2 through 5.
An extrusion device 20 extrudes PVC 19 in a predetermined shape. The extruded PVC is transported from station to station on a conveyor like system 21 which keeps the extruded PVC constantly moving through the system.
Painting station 14, shown in F;g. 2 includes a paint source 22, a paint gun 24 directed towards the extruded PVC 19, a paint shield 26 and a pressurized air line 28.
Paint source 22 may be a bucket of paint or any other source of paint that is available. Paint source 22 is attachecl to pressurized air line 28 to force the paint into paint glm 24. An adjustable valve 30 is attached between pressurized air line 28 and paint source 22 so ~hat the amount of air pressure applied to the paint may be varied, thereby varying the amount of paint which is forced into paint gun 24. If the pressure on 20 paint source 22 is increased the amount of paint forced into paint gun 24 is increased and the amount of paint spayed onto extruded PVC 19 is increased. Typically this will also increase the texture on the surface of the extruded PVC.
;. ,. ~ , . . .
~ . . , ,.,.~ ~ , , ` ' ': ' ' ~ , , ' , . ' :...... . .
2 ~ fi ~3 Preferably, for a multicolored look, the paint that is used is paint which maintains discrete colours and will not mix into a homogeneous colour. Alternatively, a single colour of paint may be used which produces a textured look, generally this will give a two coloured effect since the colour of the extruded PVC will be seen through the 5 applied colour.
Spray gun 24, shown in Figs 2 through 5, is attached to pressurized air line 28 through adjustable valves 32 and 34 so that the air pressure into the gun may be varied. Valve 32 controls the air pressure into the glm and is set at a predetermined level. Typically this level is determined by the paint gun manufacturer and is set so that 10 the gun functions properly. Valve 34 controls the air pressure at which the paint is sprayed onto the extruded PVC 19 as shown in Figs. 4 and 5. By varying the pressure at which the paint is sprayed onto the extruded PVC the thickness of the paint lines is varied thus changing the ove~all look and texture of the painted PVC.
The paint shield 26 is positioned relative to the paint gun 24 as shown in 15 Figs. 2 and 3. The paint shield 26 protects the work environment from paint that misses the extruded PVC 19.
Two air driers 36 blow cool air onto the extruded and painted PVC 19 to set the PVC and dry the paint.
A cutter 38 cuts the cooled painted extruded PVC into predetermined 20 lengths.
Fig. 6 shows a poItion of a cooled painted extruded PVC 19. As can be seen there are a multiplicity of lines and dots of paint. As discussed, the paint may be
- 6 -:`'';' ~ . : ' ' ' ' ' "' ' ' 2~1~{c~
multicolored or a single colour as desired by the end user.
It will be appreciated by those skilled in the art that the painted PVC blindsof the present invention are superior to the manually painted blinds because the apparatus may be set at specific levels so that the amount of paint and the thickness of the paint is S consistent. Further, since the paint is applied before the PVC is fully set the paint and the PVC form a composite surface structure and the paint forms an integral bond with the PVC. Therefore the paint will he less prone to chip or peel off. Further, no primer is required. Therefore the method and apparatus of the present invention provides a cost effective method and apparatus for producing visually appealing painted PVC.
It will be appreciated that the above description related to one ernbodiment by way of example only. Many variations on the invention will be obvious to those skilled in the art and such obvious variations are within the scope of the invention as described herein whether or not expressly described.
For example a paint gun having a cavity for paint could be used.
15 Alternatively, a paint gun having a fixed nozzle pressure could be used.
.. ....
. i~
multicolored or a single colour as desired by the end user.
It will be appreciated by those skilled in the art that the painted PVC blindsof the present invention are superior to the manually painted blinds because the apparatus may be set at specific levels so that the amount of paint and the thickness of the paint is S consistent. Further, since the paint is applied before the PVC is fully set the paint and the PVC form a composite surface structure and the paint forms an integral bond with the PVC. Therefore the paint will he less prone to chip or peel off. Further, no primer is required. Therefore the method and apparatus of the present invention provides a cost effective method and apparatus for producing visually appealing painted PVC.
It will be appreciated that the above description related to one ernbodiment by way of example only. Many variations on the invention will be obvious to those skilled in the art and such obvious variations are within the scope of the invention as described herein whether or not expressly described.
For example a paint gun having a cavity for paint could be used.
15 Alternatively, a paint gun having a fixed nozzle pressure could be used.
.. ....
. i~
Claims (16)
1. A method of producing textured painted extruded polyvinyl chloride having a composite surface structure and a predetermined length, comprising the steps of:
extruding the polyvinyl chloride;
spraying the extruded polyvinyl chloride with paint prior to setting the polyvinyl chloride and producing a textured surface;
setting the extruded polyvinyl chloride and drying the paint to form polyvinyl chloride with a composite textured surface structure; and cutting the set polyvinyl chloride into predetermined lengths.
extruding the polyvinyl chloride;
spraying the extruded polyvinyl chloride with paint prior to setting the polyvinyl chloride and producing a textured surface;
setting the extruded polyvinyl chloride and drying the paint to form polyvinyl chloride with a composite textured surface structure; and cutting the set polyvinyl chloride into predetermined lengths.
2. A method as claimed in claim 1 wherein the polyvinyl chloride is set and the paint is dried by blowing cool air onto the painted extruded polyvinyl chloride.
3. A method as claimed in claim 1 wherein the extruded polyvinyl chloride is sprayed with a pressurized paint gun.
4. A method as claimed in claim 3 wherein the pressurized paint gun has a gauge to vary the pressure at which the paint is sprayed.
5. A method as claimed in claim 2 wherein the extruded polyvinyl chloride is sprayed with a pressurized paint gun.
6. A method as claimed in claim 5 wherein the pressurized paint gun has a gauge to vary the pressure at which the paint is sprayed.
7. Apparatus for producing textured painted extruded polyvinyl chloride having a composite surface structure, comprising:
a polyvinyl chloride extruding device;
a paint source;
painting means connected to the paint source for spraying paint onto the extruded polyvinyl chloride prior to setting the polyvinyl chloride;
a drier for setting the polyvinyl chloride and drying the paint; and a cutting device for cutting the set polyvinyl chloride.
a polyvinyl chloride extruding device;
a paint source;
painting means connected to the paint source for spraying paint onto the extruded polyvinyl chloride prior to setting the polyvinyl chloride;
a drier for setting the polyvinyl chloride and drying the paint; and a cutting device for cutting the set polyvinyl chloride.
8. A method as claimed in claim 7 wherein the painting means is a paint sprayer.
9. An apparatus as claimed in claim 8 wherein the paint source is pressurized.
10. An apparatus as claimed in claim 9 wherein the pressure on the paint source is variable.
11. An apparatus as claimed in claim 8 wherein the paint sprayer is a pressurized paint gun.
12. An apparatus as claimed in claim 9 wherein the paint sprayer is a pressurized paint gun.
13. An apparatus as claimed in claim 10 wherein the paint sprayer is a pressurized paint gun.
14. An apparatus as claimed in claim 11 wherein the pressure of the paint spray is variable.
15. An apparatus as claimed in claim 12 wherein the pressure of the paint spray is variable.
16. An apparatus as claimed in claim 13 wherein the pressure of the paint spray is variable.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3673893A | 1993-03-25 | 1993-03-25 | |
US08/036,738 | 1993-03-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2119966A1 true CA2119966A1 (en) | 1994-09-26 |
Family
ID=21890351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA 2119966 Abandoned CA2119966A1 (en) | 1993-03-25 | 1994-03-25 | Method and apparatus for surface treatment of extruded pvc |
Country Status (1)
Country | Link |
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CA (1) | CA2119966A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6287383B1 (en) * | 1998-03-17 | 2001-09-11 | Isoteck Corporation | Texturing and preferential painting process for vertical and horizontal blinds |
US8071176B2 (en) * | 2004-09-24 | 2011-12-06 | Arkema Inc. | Process for forming a weatherable polyvinyl chloride or polyolefin article |
EP2781338A2 (en) | 2013-03-22 | 2014-09-24 | Polska Ekstruzja Spola z ograniczona odpowiedzialnoscia | Method of applying outer coating on PVC profiles and device for applying outer coating on PVC profiles |
-
1994
- 1994-03-25 CA CA 2119966 patent/CA2119966A1/en not_active Abandoned
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6287383B1 (en) * | 1998-03-17 | 2001-09-11 | Isoteck Corporation | Texturing and preferential painting process for vertical and horizontal blinds |
US8071176B2 (en) * | 2004-09-24 | 2011-12-06 | Arkema Inc. | Process for forming a weatherable polyvinyl chloride or polyolefin article |
EP2781338A2 (en) | 2013-03-22 | 2014-09-24 | Polska Ekstruzja Spola z ograniczona odpowiedzialnoscia | Method of applying outer coating on PVC profiles and device for applying outer coating on PVC profiles |
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