CA1061199A - Picture treatment process and apparatus - Google Patents
Picture treatment process and apparatusInfo
- Publication number
- CA1061199A CA1061199A CA267,258A CA267258A CA1061199A CA 1061199 A CA1061199 A CA 1061199A CA 267258 A CA267258 A CA 267258A CA 1061199 A CA1061199 A CA 1061199A
- Authority
- CA
- Canada
- Prior art keywords
- picture
- resin
- edge
- sheet
- frame
- 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.)
- Expired
Links
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
Abstract
ABSTRACT
A clear resin protective coating is applied to a picture by spreading liquid resin over the picture surface from one edge using a spreader sheet under tension which is carried by a frame hinged parallel to one edge of the picture, so that a 'wedge' of resin is advanced over the picture surface as the frame is lowered, forming upon curing a clear protective layer.
A clear resin protective coating is applied to a picture by spreading liquid resin over the picture surface from one edge using a spreader sheet under tension which is carried by a frame hinged parallel to one edge of the picture, so that a 'wedge' of resin is advanced over the picture surface as the frame is lowered, forming upon curing a clear protective layer.
Description
L9~
1 This invention relates to the treatment of pictures.
1 This invention relates to the treatment of pictures.
2 The object of the invention is to provide a process
3 for the surface treatment of pictures by means of
4 which pictures can be given a clear and durable protective coating.
6 The present invention accordingly provides in one 7 aspect a process for applying a protective coating to 8 a picture in which a clear synthetic resin in a liquid 9 or semi-liquid state is applied to the surface of the picture adjacent one edge thereof and is spread evenly 11 and without: the formation of bubbles or occlusions over 12 the picture surface from the sai~ edge by pressing a 13 flexible spreader sheet over the surface progressively 14 from the said edge, the surface of the spreader sheet in contact with the resin being such as or so treated 16 as not to adhere to the resin, and removing the sheet 17 after curing of the resinl so that the latter forms a 18 clear protective layer on the picture surface.
19 The spreader sheet, which may conveniently comprise clear plastics film maintained under tension, is, in a 21 preferred embodiment of the invention, progressively 22 pressed over the resin csating by advancing a roller 23 over the sheet, the axis of the roller being substantially 24 parallel to the said edge of the picture.
The resin applied to the picture may be a chemically 26 hardening or thermosetting plastics, which sets to 27 form a hard clear protective coating on the surface of 28 the picture.
29 A picture treated in accordance with the invention is extremely durable and is easy to handle. Moreover, 31 since the protective layer applied to the picture can - 1- ~
6~ 9~
1 be formed with a glazed or highly polished surface, 2 it is not necessary to mount the picture in a 3 glazed frame.
4 The present invention also provides, in another aspect, an apparatus for applying a protective coating 6 to a picture comprising a flat horizontal base on which 7 a picture to be treated may be placed, with its picture 8 surface uppermost, a movable frame disposed above the 9 base and,supporting a flexible spreader sheet under tension, the frame being hinged to the base at one edge 11 ~or movement relative to the base about a hinge axis 12 substantially parallel to one edge of the picture, the 13 frame being movable between a raised position in which 14 it permits removal of a picture from and placement of a picture on the base and a lowered position in which 16 the spreader sheet is, when the apparatus is in use, 17 parallel to the picture surface and spaced th~refrom, 18 so that a clear synthetic resin in liquid or semi-liquid 19 st te can be introduced between the spreader sheet and the picture surface and spread evenly over the said 21 surface from the edge of the picture nearest the.hinge 22 axis of the movable frame, and a releasable clamp device 23 for clamping the frame in its lowered position relative 24 to the base, at least the lower surface of the spreader sheet being such as or so treated as not to adhere to 26 the resin.
27 In a preferred method of carrying out the invention 28 the picture to be treated, which may consist, for 29 example, of an original painting, a drawing, map, print or photographic print, may initially be mounted on a 31 rigid backing member, either singly or together with 1 other pictures. The backing member may be of any 2 convenient material, for example blockboard, chipboard, 3 hardboard or wood, and the picture would normally be 4 mounted on the board by a conventional glueing method.
After this mounting the picture is preferably given a 6 thin brushed coating of a clear sealant material such 7 as a thick polyester resin to seal the picture, this 8 resin being allowed to harden to seal the picture 9 before the protective layer is applied.
A typical apparatus according to one embodiment of 11 the invention is illustrated, by way of example, in 12 the accompanying drawing, which is a diagrammatic 13 longitudinal section through the apparatus during the 1~ treatment of a picture by the process of the present invention.
16 Referring to the drawing, a picture l, for example 17 a print or prints, to be treated is adhesively mounted 18 on a rigid backing board 2 as previously described and 19 given a clear resin sealing coating by brushing on a thick polyester resin. The board-mounted sealed picture 21 is then placed on a flat horizontal base 3 with one edge 22 of the board 2 abutting an upstanding stop 4 on the base 23 3.
24 A wooden rectangular frame 5 of suitable size, for example 2 ft. x 3 ft. is hinged at one edge to one 26 edge of the base 3 for movement about a hinge axis which 27 is parallel to one edge of the picture l. Before 28 attaching the frame 5 to the base 3 a spreader sheet 6 29 of flexible clear plastics film, preferably "Melinex"
(Trade Mark) not less than one hundred microns thick 31 and of suitable grade, is placed on the face of the 106~3L9~
1 frame 5 which is lowermost when the frame is attached 2 to the base. The spreader sheet 5 is attached, for 3 example by stapling, to the upper face of the frame 5, 4 being wrapped around the edges of the frame. After attachment to the frame 5 the plastics sheet 6 is heat-6 treated to cause the film to contract, thereby stretching 7 it uniformly in the frame 5, so that the film constituting 8 the spreader sheet 6 becomes drum tight.
9 The end of the frame 5 remote from the hinged end is supported by a cord or wire 7 which passes over a 11 fixed freely rotatable pulley 8 to a freely hanging 12 counterweight 9 of such a size as to support the frame 13 5 in a neutral or rest position as shown in which it 14 is raised from the base 3 so as to enable a board-mounted pictuxe 1 to be treated to be placed on the 16 base 3 against the stop 4.
17 The end of the base 3 remote from its hinge attachment 18 to the frame 5 is provided with a suitable releasable 19 clamp device lO adapted to engage the adjacent end of the frame 5 when the latter is lowered fully onto 21 the base 3. The thickness of the frame S is such that 22 in the fully lowered position, the plastics sheet 6 23 supported by the frame 5 is parallel to the surface of 2~ the picture l to be coated and spaced therefrom by a predetermined distance, shown e~aggerated in the drawing 26 for clarity, which ensures the absence o~ vertical 27 forces between the plastics spreader sheet 6 and the 28 picture backing board 2 when the frame 5 is fully lowered.
29 The absence of such vertical forces avoids any tendency towards partial or momentary separation of the sheet 31 6 from the picture backing board 2, which could lead to ~6~9 1 ingress of air. If desired suitable distance pieces 2 may be interposed between the frame 5 and the base 3 3 to ensure the requisite spacing between the spreader 4 sheet 6 and the surface of the picture 1.
~hen carrying out the process of the present invention 6 a release agent such as a fluorinated hydrocarbon is 7 first applied by spraying onto the lower surface of the 8 stretched plastics film spreader sheet 6, taking care 9 to avoid scratching of this film. With the frame 5 initially fully raised a bubble-free clear synthetic 11 resin ll in liquid or semi-liquid form, with a hardener, 12 is applied to -the face of the picture backing board 13 2 across the entire width of the latter at the end 14 thereof adjoining the hinged end of the frame 5. ~he frame 5 is then lowered until contact is made between 16 the coated surface of the film 6 and the resin 11. A
17 roller 12 of resiliently soft, flexible material 18 mounted upon a rigid shaft is then pressed onto the 19 plastics spreader sheet 6 ad3acent the edge of the picture backing board 2 at which the resin 11 has been 21 applied, with the axis of the roller 12 parallel to 22 this edge. The length of the roller 12 should be at 23 least equal to the entire width of the spreader sheet 24 6 and the underlying board 2.
The roller 12 is then rolled carefully over the 26 upper surface of the spreader sheet 6 with sufficient 27 maintained downward pressure to cause continuous flowing 28 of the resin 11 over the board 2 and the picture 1 29 mounted thereon, the frame 5 being at the same time lowered progressively onto the base board 3 until the 31 fully lowered position is reached, in which the sheet 1 6 is parallel to and spaced from ~he surface of the board 2 2 and a uniform bubble-free plastics layer fills the 3 space between the sheet 6 and the board 2. In fact, 4 the progressive advance of the roller 12, from right to left as viewed in the drawing, pushes a wave of resin, 6 trapped beneath the shee~ 6, ahead of the roller. This 7 wave effectively pushes out the air from the space 8 beneath the sheet 6, ensuring complete exclusion of 9 air from the resin coating.
When the roller 12 has reached the end of its travel, 11 at the stop 4, the counterweight 9 is disconnected and 12 the frame 5 held in position on the base 3 by means 13 of the clamp device lO, with th~ sheet 6 parallel to 14 the surface of the board 2. The entire assembly is a~lowed to remain at a suitable temperature, appropriate 16 to the resin ll, until the resin ll has completely hardened.
17 The clamp device lO is then released and the frame 5 18 lifted to separate the plastics film spreader sheet 19 6 from the clear hard protective layer of resin which will have formed on the board 2 and the picture l 21 l mounted thereon.
22 Any suitable clear resin which sets to a fully hard 23 condition may be used to form the protective layer 24 over the picture. The resin may be entirely thermosetting, or may be of the chemically hardening type herein 26 described requiring admixture with a hardener before 27 application to the surface to be coated.
6 The present invention accordingly provides in one 7 aspect a process for applying a protective coating to 8 a picture in which a clear synthetic resin in a liquid 9 or semi-liquid state is applied to the surface of the picture adjacent one edge thereof and is spread evenly 11 and without: the formation of bubbles or occlusions over 12 the picture surface from the sai~ edge by pressing a 13 flexible spreader sheet over the surface progressively 14 from the said edge, the surface of the spreader sheet in contact with the resin being such as or so treated 16 as not to adhere to the resin, and removing the sheet 17 after curing of the resinl so that the latter forms a 18 clear protective layer on the picture surface.
19 The spreader sheet, which may conveniently comprise clear plastics film maintained under tension, is, in a 21 preferred embodiment of the invention, progressively 22 pressed over the resin csating by advancing a roller 23 over the sheet, the axis of the roller being substantially 24 parallel to the said edge of the picture.
The resin applied to the picture may be a chemically 26 hardening or thermosetting plastics, which sets to 27 form a hard clear protective coating on the surface of 28 the picture.
29 A picture treated in accordance with the invention is extremely durable and is easy to handle. Moreover, 31 since the protective layer applied to the picture can - 1- ~
6~ 9~
1 be formed with a glazed or highly polished surface, 2 it is not necessary to mount the picture in a 3 glazed frame.
4 The present invention also provides, in another aspect, an apparatus for applying a protective coating 6 to a picture comprising a flat horizontal base on which 7 a picture to be treated may be placed, with its picture 8 surface uppermost, a movable frame disposed above the 9 base and,supporting a flexible spreader sheet under tension, the frame being hinged to the base at one edge 11 ~or movement relative to the base about a hinge axis 12 substantially parallel to one edge of the picture, the 13 frame being movable between a raised position in which 14 it permits removal of a picture from and placement of a picture on the base and a lowered position in which 16 the spreader sheet is, when the apparatus is in use, 17 parallel to the picture surface and spaced th~refrom, 18 so that a clear synthetic resin in liquid or semi-liquid 19 st te can be introduced between the spreader sheet and the picture surface and spread evenly over the said 21 surface from the edge of the picture nearest the.hinge 22 axis of the movable frame, and a releasable clamp device 23 for clamping the frame in its lowered position relative 24 to the base, at least the lower surface of the spreader sheet being such as or so treated as not to adhere to 26 the resin.
27 In a preferred method of carrying out the invention 28 the picture to be treated, which may consist, for 29 example, of an original painting, a drawing, map, print or photographic print, may initially be mounted on a 31 rigid backing member, either singly or together with 1 other pictures. The backing member may be of any 2 convenient material, for example blockboard, chipboard, 3 hardboard or wood, and the picture would normally be 4 mounted on the board by a conventional glueing method.
After this mounting the picture is preferably given a 6 thin brushed coating of a clear sealant material such 7 as a thick polyester resin to seal the picture, this 8 resin being allowed to harden to seal the picture 9 before the protective layer is applied.
A typical apparatus according to one embodiment of 11 the invention is illustrated, by way of example, in 12 the accompanying drawing, which is a diagrammatic 13 longitudinal section through the apparatus during the 1~ treatment of a picture by the process of the present invention.
16 Referring to the drawing, a picture l, for example 17 a print or prints, to be treated is adhesively mounted 18 on a rigid backing board 2 as previously described and 19 given a clear resin sealing coating by brushing on a thick polyester resin. The board-mounted sealed picture 21 is then placed on a flat horizontal base 3 with one edge 22 of the board 2 abutting an upstanding stop 4 on the base 23 3.
24 A wooden rectangular frame 5 of suitable size, for example 2 ft. x 3 ft. is hinged at one edge to one 26 edge of the base 3 for movement about a hinge axis which 27 is parallel to one edge of the picture l. Before 28 attaching the frame 5 to the base 3 a spreader sheet 6 29 of flexible clear plastics film, preferably "Melinex"
(Trade Mark) not less than one hundred microns thick 31 and of suitable grade, is placed on the face of the 106~3L9~
1 frame 5 which is lowermost when the frame is attached 2 to the base. The spreader sheet 5 is attached, for 3 example by stapling, to the upper face of the frame 5, 4 being wrapped around the edges of the frame. After attachment to the frame 5 the plastics sheet 6 is heat-6 treated to cause the film to contract, thereby stretching 7 it uniformly in the frame 5, so that the film constituting 8 the spreader sheet 6 becomes drum tight.
9 The end of the frame 5 remote from the hinged end is supported by a cord or wire 7 which passes over a 11 fixed freely rotatable pulley 8 to a freely hanging 12 counterweight 9 of such a size as to support the frame 13 5 in a neutral or rest position as shown in which it 14 is raised from the base 3 so as to enable a board-mounted pictuxe 1 to be treated to be placed on the 16 base 3 against the stop 4.
17 The end of the base 3 remote from its hinge attachment 18 to the frame 5 is provided with a suitable releasable 19 clamp device lO adapted to engage the adjacent end of the frame 5 when the latter is lowered fully onto 21 the base 3. The thickness of the frame S is such that 22 in the fully lowered position, the plastics sheet 6 23 supported by the frame 5 is parallel to the surface of 2~ the picture l to be coated and spaced therefrom by a predetermined distance, shown e~aggerated in the drawing 26 for clarity, which ensures the absence o~ vertical 27 forces between the plastics spreader sheet 6 and the 28 picture backing board 2 when the frame 5 is fully lowered.
29 The absence of such vertical forces avoids any tendency towards partial or momentary separation of the sheet 31 6 from the picture backing board 2, which could lead to ~6~9 1 ingress of air. If desired suitable distance pieces 2 may be interposed between the frame 5 and the base 3 3 to ensure the requisite spacing between the spreader 4 sheet 6 and the surface of the picture 1.
~hen carrying out the process of the present invention 6 a release agent such as a fluorinated hydrocarbon is 7 first applied by spraying onto the lower surface of the 8 stretched plastics film spreader sheet 6, taking care 9 to avoid scratching of this film. With the frame 5 initially fully raised a bubble-free clear synthetic 11 resin ll in liquid or semi-liquid form, with a hardener, 12 is applied to -the face of the picture backing board 13 2 across the entire width of the latter at the end 14 thereof adjoining the hinged end of the frame 5. ~he frame 5 is then lowered until contact is made between 16 the coated surface of the film 6 and the resin 11. A
17 roller 12 of resiliently soft, flexible material 18 mounted upon a rigid shaft is then pressed onto the 19 plastics spreader sheet 6 ad3acent the edge of the picture backing board 2 at which the resin 11 has been 21 applied, with the axis of the roller 12 parallel to 22 this edge. The length of the roller 12 should be at 23 least equal to the entire width of the spreader sheet 24 6 and the underlying board 2.
The roller 12 is then rolled carefully over the 26 upper surface of the spreader sheet 6 with sufficient 27 maintained downward pressure to cause continuous flowing 28 of the resin 11 over the board 2 and the picture 1 29 mounted thereon, the frame 5 being at the same time lowered progressively onto the base board 3 until the 31 fully lowered position is reached, in which the sheet 1 6 is parallel to and spaced from ~he surface of the board 2 2 and a uniform bubble-free plastics layer fills the 3 space between the sheet 6 and the board 2. In fact, 4 the progressive advance of the roller 12, from right to left as viewed in the drawing, pushes a wave of resin, 6 trapped beneath the shee~ 6, ahead of the roller. This 7 wave effectively pushes out the air from the space 8 beneath the sheet 6, ensuring complete exclusion of 9 air from the resin coating.
When the roller 12 has reached the end of its travel, 11 at the stop 4, the counterweight 9 is disconnected and 12 the frame 5 held in position on the base 3 by means 13 of the clamp device lO, with th~ sheet 6 parallel to 14 the surface of the board 2. The entire assembly is a~lowed to remain at a suitable temperature, appropriate 16 to the resin ll, until the resin ll has completely hardened.
17 The clamp device lO is then released and the frame 5 18 lifted to separate the plastics film spreader sheet 19 6 from the clear hard protective layer of resin which will have formed on the board 2 and the picture l 21 l mounted thereon.
22 Any suitable clear resin which sets to a fully hard 23 condition may be used to form the protective layer 24 over the picture. The resin may be entirely thermosetting, or may be of the chemically hardening type herein 26 described requiring admixture with a hardener before 27 application to the surface to be coated.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:
1. Process for applying a protective coating to the surface of a picture comprising the steps of:
- applying a clear synthetic resin in liquid state to the surface of the picture adjacent one edge thereof, - spreading the liquid resin evenly and without the formation of bubbles or occlusions over the said picture surface from the said edge by pressing a flexible spreader sheet under tension over the surface progressively from the said edge, the surface of the spreader sheet which contacts the resin being such that the resin does not adhere thereto, - curing the resin, and - removing the sheet to leave a hard, clear protective layer of resin on the picture surface.
- applying a clear synthetic resin in liquid state to the surface of the picture adjacent one edge thereof, - spreading the liquid resin evenly and without the formation of bubbles or occlusions over the said picture surface from the said edge by pressing a flexible spreader sheet under tension over the surface progressively from the said edge, the surface of the spreader sheet which contacts the resin being such that the resin does not adhere thereto, - curing the resin, and - removing the sheet to leave a hard, clear protective layer of resin on the picture surface.
2. Process as defined in Claim 1, in which the sheet is progressively pressed over the resin coating by advancing a roller over the sheet, the axis of the roller being substantially parallel to the said edge of the picture.
3. Process as defined in Claim 1, in which the synthetic resin is admixed with a chemical hardening agent.
4. Process as defined in Claim 1, in which the spreader sheet comprises a flexible clear plastics film.
5. Process as defined in Claim 1, in which the picture to be coated, prior to the application of the liquid synthetic resin, is mounted upon a rigid backing mamber and its surface sealed by the application thereto of a coating of clear sealant material which is allowed to harden before the liquid resin is spread on the sealed surface.
6. Process as defined in Claim 1, in which a release agent is applied to the surface of the spreader sheet which comes into contact with the synthetic resin.
7. Apparatus for applying a protective coating to a picture, comprising in combination: a flat horizontal base on which a picture is placed in use of the apparatus with its surface to be coated facing upwardly, a movable frame disposed above the base; a flexible spreader sheet supported by the frame and maintained in tension; hinge means at one edge of the frame pivotally attaching the frame to the base for movement relative to the base about a hinge axis at said edge, parallel to and adjacent one edge of the picture in use of the apparatus, the frame being movable between a raised position in which it permits removal of a picture from and placement of a picture on the base and a lowered position in which the spreader sheet is parallel to the picture surface and spaced therefrom, whereby a clear synthetic resin in liquid state when introduced between the spreader sheet and the picture surface is spread evenly over said picture surface from said one edge of the picture, and releasable clamp means for clamping the frame in its lowered position relative to the base, at least the lower surface of the spreader sheet being such that the resin is non-adherent thereto.
8. The apparatus defined in Claim 7, including counterweight means attached to the edge of the frame opposite the hinged edge and adapted normally to hold the frame in its raised position relative to the base.
9. The apparatus defined in Claim 7, including a roller arranged upon the spreader sheet with its axis parallel to the frame hinge axis and extending across the entire width of the spreader sheet, the roller being movable over the upper surface of the sheet from the said one edge of the picture to assist the spreading of resin beneath the sheet in use of the apparatus.
10. The apparatus defined in Claim 9, in which the roller is of soft, flexible material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA267,258A CA1061199A (en) | 1976-12-06 | 1976-12-06 | Picture treatment process and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA267,258A CA1061199A (en) | 1976-12-06 | 1976-12-06 | Picture treatment process and apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1061199A true CA1061199A (en) | 1979-08-28 |
Family
ID=4107449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA267,258A Expired CA1061199A (en) | 1976-12-06 | 1976-12-06 | Picture treatment process and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1061199A (en) |
-
1976
- 1976-12-06 CA CA267,258A patent/CA1061199A/en not_active Expired
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