Claims
- 1. A package of laminated sheeting in which the sheeting has a paper layer laminated to a layer not over about 1/8 inch thick of pliable closed-cell microcellular resin foam, the foam having its outer surface coated with a cohesive-nonadhesive layer containing sufficient anti-static material to inhibit the build-up of static electricity on the sheet, the package having the sheeting tightly wrapped in an opaque wrapper.
- 2. A laminated protective sheeting having a paper layer, a layer not over 1/8 inch thick of pliable closed-cell micro-cellular resin foam, adhesive material securely bonding the micro-cellular foam layer to the paper layer, and the foam having its outer surface coated with a cohesive-nonadhesive layer containing sufficient potassium formate to inhibit the build-up of static electricity on the sheet.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 3210360 |
Mar 1982 |
DEX |
|
Parent Case Info
This application is in part a continuation of prior application Ser. No. 348,782 filed Feb. 16, 1982, (subsequently abandoned) which prior application is a continuation-in-part of earlier application Ser. No. 246,372 filed Mar. 23, 1981 (U.S. Pat. No. 4,321,297 granted Mar. 23, 1982), which in its turn is a continuation-in-part of still earlier application Ser. No. 166,079 filed July 7, 1980 (U.S. Pat. No. 4,263,360 granted Apr. 21, 1981), and the contents of Ser. No. 246,372 are incorporated herein as though fully set forth.
U.S. Pat. No. 4,086,384 describes highly useful laminated packaging sheets in which a layer of pliable closed-cell microcellular foam is adhered to a layer of paper, which may be reinforced by fiberglass strands and/or may have a surface coating of cohesive-nonadhesive. Such material is very effective for interleaving with, or wrapping around, objects to make a package, but may not be sufficiently protective of some objects that are particularly sensitive.
Among the objects of the present invention is the provision of improved laminated sheet material for protecting or packaging materials.
Additional objects of the present invention include improved protective and packaging techniques.
According to the present invention, an important or key surface is protected by foam laminate while work is being done on or near it, or where the surface is being used as a temporary walkway. The laminate has a thin layer of smooth- or nonabrasivefaced resilient foam not over about 1/8 inch thick adhered to a supporting wear-resistant layer less than 1/25 inch, preferably less than 1/50 inch thick, the face of the foam layer that is not adhered to the supporting layer carrying a stratum of frictionincreasing material that reduces the tendency of the laminate to slide along a surface on which that face is placed.
A low-tack pressure-sensitive adhesive is a particularly desirable friction-increasing material to more securely hold a foam laminate against a surface from which it is to be subsequently removed without leaving a residue. Depositing such adhesive from a solvent onto either face of the laminate causes the adhesive to adhere to that face more strongly than to a surface against which the dried adhesive-carrying face is then merely pressed.
According to another aspect of the present invention, a padded sheet of packaging material for objects which are sensitive to electricity, has a layer of paper or other support adhered to one face of a pliable layer of a closed-cell micro-cellular foam, and the foam carries a coating of a cohesive-nonadhesive layer containing anti-static material to inhibit the build-up of static electricity on the sheet.
Any of the foregoing papers may be reinforced with strands of fiberglass to strengthen them. Reinforcement may also be accomplished by adhering other types of mesh such as polypropylene mesh or polyester scrim to the laminate or between the laminae, or the foam-supporting sheet can be a spun-bonded polyolefin or spun-bonded glass fiber sheet or a sheet woven from oriented flat narrow plastic tapes. Such sheets have tremendous resistance to puncturing and tearing. On the other hand, the foam-supporting sheet can be creped or extensible paper to permit the laminate to better follow contours when applied to concave or convex surfaces.
Where the foam, or the supporting sheet, carries a cohesive-nonadhesive surface stratum, such a stratum can show a residual level of adhesion enough to cause such stratum to block and greatly resist unwinding of a roll of such coated laminate. This blocking effect is much more pronounced when the cohesive-nonadhesive stratum is applied to a paper face, as compared with a foam face, and also when the surface against which it is wrapped around is a corona-treated or untreated polyethylene, but can be reduced or eliminated by incorporating an inert powder such as clay in the cohesive-nonadhesive layer. Between about 5 and about 15% clay does a very good job without substantially reducing the aggressiveness of the cohesive action.
Anti-static compositions such as potassium formate or those referred to in Ser. No. 246,372 also have a significant friction-increasing effect when present by themselves on the surface of a resilient micro-cellular closed-cell foam.
Other improved packaging sheets of the present invention contain opaquing material.
US Referenced Citations (13)
Foreign Referenced Citations (1)
| Number |
Date |
Country |
| 1362035 |
Apr 1964 |
FRX |
Continuation in Parts (3)
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Number |
Date |
Country |
| Parent |
348782 |
Feb 1982 |
|
| Parent |
246372 |
Mar 1981 |
|
| Parent |
166079 |
Jul 1980 |
|
Patent Grant
4584225
