CA1036776A - Laminated pvc film with microcell surface - Google Patents
Laminated pvc film with microcell surfaceInfo
- Publication number
- CA1036776A CA1036776A CA177,756A CA177756A CA1036776A CA 1036776 A CA1036776 A CA 1036776A CA 177756 A CA177756 A CA 177756A CA 1036776 A CA1036776 A CA 1036776A
- Authority
- CA
- Canada
- Prior art keywords
- film
- microcells
- microcell
- smooth surface
- tacky
- 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
- 230000001788 irregular Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 8
- 239000004800 polyvinyl chloride Substances 0.000 claims description 15
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 15
- 229920003023 plastic Polymers 0.000 claims description 10
- 239000004033 plastic Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 description 7
- 241000233866 Fungi Species 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- -1 polyethylene acrylate Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A PVC film with a non-tacky microcell surface on one side is provided which does not adhere to any smooth surface such as photographs, slides, negatives and other materials requiring covering for protection such as in photo-albums, slide-sheets, negative-albums, and X-ray film covers where a slightly opaque surface is needed to protect the materials from damage caused by direct light. A film is specifically treated to provide microcells on one surface thereof which avoid adherence of the film to smooth surfaces. These microcells are made possible by application means or mechanical means. The microcells formed are an integral part of the original film, and cannot be defined as to structure or size since the same are of an irregular nature.
A PVC film with a non-tacky microcell surface on one side is provided which does not adhere to any smooth surface such as photographs, slides, negatives and other materials requiring covering for protection such as in photo-albums, slide-sheets, negative-albums, and X-ray film covers where a slightly opaque surface is needed to protect the materials from damage caused by direct light. A film is specifically treated to provide microcells on one surface thereof which avoid adherence of the film to smooth surfaces. These microcells are made possible by application means or mechanical means. The microcells formed are an integral part of the original film, and cannot be defined as to structure or size since the same are of an irregular nature.
Description
~036776 BACKGROUND AND PROBLEMS
Smooth films of plastic such as PVC, polyethylene acrylate, acrylic polymers and thP like, being completely transparent, have the tendency to adhere to any smooth surface which causes a problem when it is necessary to disengage the film from the surface. Damage to such surface can also be avoided by use of the new film.
THE PRESENT INVENTION
This invention refers to a plain film with a microcell surface on oné side which has many advantages over any other prior film of the same nature. One side of the film, must be completely smooth to maintain the transparency of the treated film.
The film of the present invention will not adhere under any condition to any other smooth surface such as photo-graphs, negatives, diapositive films, X-ray films, etc. Also, although coins do not have completely smooth surfaces, it has been found that the new PVC film with a microcell surface serves to avoid adherence of the coins to the covering film, such as in an album for numismatic purposes.
~ The film of the present invention avoids retention of moisture and development of fungus between the film of the invention and any other smooth surface such as those mentioned above, due to the circulation of air between the microcell surface of the film and such other smooth surfaces.
~ The film of the present invention when placed with the treated surface against materials such as films and photographs protects same from direct light and decoloration, due to the irregular nature of the microcells which causes a filtering of light rays, the plurality of facets formed in the microcells not allowing passage of light rays in such a manner as to penetrate the film directly or completely.
Due to the electrostatic properties of the film and the microcells therein, dust is attracted by the material and ~k`' ~C~36776 introduced within the voids formed by the microcells and thu~
is kept away from the objects covered.
The film of the present invention may be used in folder covers, sheets, etc., to protect printiIlgs, documents, and photographs.
In one`aspect of the present invention there is provided a process for obtaining a non-tacky microcell surface on films of PVC or the like on one side thereof, such films having a completely smooth surface on the other slde which process comprises passing the film through two rolls, of which the upper roll is a metallic roll chrome-plated to a mirror finish and the lower roll is made of hardened rubber the outer surface of which is engraved with raised irregular patterns, this engraving being impressed upon the side of the film being treated, the temperature of the film being approximately 120-150C. when passing through the two rolls and the film being cooled immediately thereafter.
In the drawings which illustrate this invention Figures 1 and 2 are side views of X-ray films covered with respectively a smooth surface material and with a film treated in accordance with this invention. Figures 3 and 4 are side views of respectively an untreated ordinary film and a film treated in accordance with this invention. Figures 7 and 8 are similarly nontreated and treated film, in plan view.
The film shown in Figures 3, 5 and 7, when placed on an X-ray film such as shown in Figure 1, does not permit circulation of air. The two smooth surfaces adhere to one another retaining moisture and eventually damaging the negative.
The treated film shown in Figures 4, 6 and 8, when placed on an X-ray film as shown in Figure 2, it is clear that air can circulate between the treated film and the negative. The film does not adhere to the negative and humidity is not permitted to build up to the negative and humitidy is not permitted to build up in the space be~ween the two films.
The film of the present invention may be prepared by applying a thin layer of liquid plastic such as polyvinyl chloride to polyvinyl chloride film previously submitted to a smoothing of both `sides of the film. This layer of liquid plastic thus applied must have a thickness not in excess of 0.001 inches. The liquid plastic, upon drying and solidifying forms microcells upon the surface to which it is applied, such microcells constitutin~ an integral part of the original film.
Tho dried plastic should have a hardness greater than that of thQ non-treated polyvinyl chloride film. The surface to which the treatment is given is non-tacky and air circulates between such surface and any other smooth surface with which contact is made since the microcells are formed of irregular peaks and valleys and such contact is produced only between the peaks and the other smooth surface with air circulating between the valleys.
Inasmuch as the microcells are of irregular structure and size, the circulation of air provided is enhanced, thus avoiding adherence of the new film to any other smooth surface, and also avoiding accumulation of moisture and development of fungus.
The application of the liquid plastic or polyvinyl chloride by means of rolls is effected by passing the smooth film through two rolls the lower of which is slightly wet with the liquid PVC supplied to such roll from a deposit located underneath said lower roll and controlled by a rubber device conventional in the art. The liquid PVC adheres to the surface of the smooth film leaving a rugged surface. Upon drying the PVC applied to the film hardens and forms the microcells. Application may also be made by means of spraying metered liquid plastic through nozzles upon the surface to be treated.
The microcell surface is also prepared by mechanical means. In this process, plain, non-treated PVC film is passed 103677~i through two rolls. The upper roll is a metallic roll chrome-plated to a mirror finish. The purpose of this roll is to maintain the required smooth surface on one side of the film.
The lower roll is made of hardened rubber, specially treated, the outer surface of which is engravea with raised irregular patterns. This engraving is impressed upon the side of the film which is being treated. In this manner, irregular micro-cells are formed on such surface contacted by the lower roll.
The PVC film being thus treated must have a temperature of about 120-150C. before being passed through the two rolls, and once the film has been subjected to the action of the rolls, same must be cooled immediately by any conventional cooling system.
~?
Smooth films of plastic such as PVC, polyethylene acrylate, acrylic polymers and thP like, being completely transparent, have the tendency to adhere to any smooth surface which causes a problem when it is necessary to disengage the film from the surface. Damage to such surface can also be avoided by use of the new film.
THE PRESENT INVENTION
This invention refers to a plain film with a microcell surface on oné side which has many advantages over any other prior film of the same nature. One side of the film, must be completely smooth to maintain the transparency of the treated film.
The film of the present invention will not adhere under any condition to any other smooth surface such as photo-graphs, negatives, diapositive films, X-ray films, etc. Also, although coins do not have completely smooth surfaces, it has been found that the new PVC film with a microcell surface serves to avoid adherence of the coins to the covering film, such as in an album for numismatic purposes.
~ The film of the present invention avoids retention of moisture and development of fungus between the film of the invention and any other smooth surface such as those mentioned above, due to the circulation of air between the microcell surface of the film and such other smooth surfaces.
~ The film of the present invention when placed with the treated surface against materials such as films and photographs protects same from direct light and decoloration, due to the irregular nature of the microcells which causes a filtering of light rays, the plurality of facets formed in the microcells not allowing passage of light rays in such a manner as to penetrate the film directly or completely.
Due to the electrostatic properties of the film and the microcells therein, dust is attracted by the material and ~k`' ~C~36776 introduced within the voids formed by the microcells and thu~
is kept away from the objects covered.
The film of the present invention may be used in folder covers, sheets, etc., to protect printiIlgs, documents, and photographs.
In one`aspect of the present invention there is provided a process for obtaining a non-tacky microcell surface on films of PVC or the like on one side thereof, such films having a completely smooth surface on the other slde which process comprises passing the film through two rolls, of which the upper roll is a metallic roll chrome-plated to a mirror finish and the lower roll is made of hardened rubber the outer surface of which is engraved with raised irregular patterns, this engraving being impressed upon the side of the film being treated, the temperature of the film being approximately 120-150C. when passing through the two rolls and the film being cooled immediately thereafter.
In the drawings which illustrate this invention Figures 1 and 2 are side views of X-ray films covered with respectively a smooth surface material and with a film treated in accordance with this invention. Figures 3 and 4 are side views of respectively an untreated ordinary film and a film treated in accordance with this invention. Figures 7 and 8 are similarly nontreated and treated film, in plan view.
The film shown in Figures 3, 5 and 7, when placed on an X-ray film such as shown in Figure 1, does not permit circulation of air. The two smooth surfaces adhere to one another retaining moisture and eventually damaging the negative.
The treated film shown in Figures 4, 6 and 8, when placed on an X-ray film as shown in Figure 2, it is clear that air can circulate between the treated film and the negative. The film does not adhere to the negative and humidity is not permitted to build up to the negative and humitidy is not permitted to build up in the space be~ween the two films.
The film of the present invention may be prepared by applying a thin layer of liquid plastic such as polyvinyl chloride to polyvinyl chloride film previously submitted to a smoothing of both `sides of the film. This layer of liquid plastic thus applied must have a thickness not in excess of 0.001 inches. The liquid plastic, upon drying and solidifying forms microcells upon the surface to which it is applied, such microcells constitutin~ an integral part of the original film.
Tho dried plastic should have a hardness greater than that of thQ non-treated polyvinyl chloride film. The surface to which the treatment is given is non-tacky and air circulates between such surface and any other smooth surface with which contact is made since the microcells are formed of irregular peaks and valleys and such contact is produced only between the peaks and the other smooth surface with air circulating between the valleys.
Inasmuch as the microcells are of irregular structure and size, the circulation of air provided is enhanced, thus avoiding adherence of the new film to any other smooth surface, and also avoiding accumulation of moisture and development of fungus.
The application of the liquid plastic or polyvinyl chloride by means of rolls is effected by passing the smooth film through two rolls the lower of which is slightly wet with the liquid PVC supplied to such roll from a deposit located underneath said lower roll and controlled by a rubber device conventional in the art. The liquid PVC adheres to the surface of the smooth film leaving a rugged surface. Upon drying the PVC applied to the film hardens and forms the microcells. Application may also be made by means of spraying metered liquid plastic through nozzles upon the surface to be treated.
The microcell surface is also prepared by mechanical means. In this process, plain, non-treated PVC film is passed 103677~i through two rolls. The upper roll is a metallic roll chrome-plated to a mirror finish. The purpose of this roll is to maintain the required smooth surface on one side of the film.
The lower roll is made of hardened rubber, specially treated, the outer surface of which is engravea with raised irregular patterns. This engraving is impressed upon the side of the film which is being treated. In this manner, irregular micro-cells are formed on such surface contacted by the lower roll.
The PVC film being thus treated must have a temperature of about 120-150C. before being passed through the two rolls, and once the film has been subjected to the action of the rolls, same must be cooled immediately by any conventional cooling system.
~?
Claims (3)
1. A process for obtaining a non-tacky microcell surface on films of polyvinyl chloride plastics material, on one side thereof, such films having a completely smooth surface on the other side, which process comprises passing the film through two rolls, of which the upper roll is a metallic roll chrome-plated to a mirror finish and the lower roll is made of hardened rubber the outer surface of which is engraved with raised irregular patterns, this engraving being impressed upon the side of the film being treated, the temperature of the film being approximately 120-150°C. when passing through the two rolls, and the film being cooled immediately thereafter.
2. A film of polyvinyl chloride plastics material, with a non-tacky microcell surface on one side and a completely smooth surface on the other side, the microcells forming an integral part of the film as prepared by the process claimed in claim 1.
3. A film of polyvinyl chloride plastics material, with a non-tacky microcell surface on one side and a completely smooth surface on the other side, the microcells forming an integral part of the film as prepared by the process claimed in claim 1; wherein the microcells are of irregular structure or size, thus affording the circulation of air between the microcell surface and any other smooth surface contacted by same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA177,756A CA1036776A (en) | 1973-07-31 | 1973-07-31 | Laminated pvc film with microcell surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA177,756A CA1036776A (en) | 1973-07-31 | 1973-07-31 | Laminated pvc film with microcell surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1036776A true CA1036776A (en) | 1978-08-22 |
Family
ID=4097456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA177,756A Expired CA1036776A (en) | 1973-07-31 | 1973-07-31 | Laminated pvc film with microcell surface |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1036776A (en) |
-
1973
- 1973-07-31 CA CA177,756A patent/CA1036776A/en not_active Expired
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