Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1992-09-16
1994-09-06
Ryan, Patrick J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
428 40, 428 62, 428 97, 428107, 428292, 428294, 428327, 428343, 428355, B32B 900
Patent
active
053446933
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a unitary component comprising a substrate having a surface and a plurality of non-interconnecting spacing means extending in a direction outwardly from the said surface such that the said surface is spaced from contact with another surface when located adjacent the component.
There are many instances where it is necessary to maintain separation of a surface carrying an adhesive and an adjacent surface until it is required that the two surfaces shall unite one with another by the adhesive.
In U.S. Pat. No. 4,392,897 and U.S. Pat. No. 4,519,095 there is disclosed a manufacturing process for applying to a plastics film a channel shaped plastics strip having an adhesive extending longitudinally therein. An object of the process is to provide a bag closure by coextruding the strip on to a moving web of plastics film which subsequently is formed into plastics bags.
The composition of the strip is such that the spaced parallel ribs which comprise opposite facing walls of the channel section located on a wall of a bag are deformed away from one another when the wall is engaged under pressure by an opposite facing wall of the bag. In consequence, the ribs do not prevent unintentional closure of the bag and if the adhesive is aggressive such premature closure could render the bag useless.
Furthermore, coextrusion of the strip and the web requires costly, complex and dedicated machinery with a requirement of sophisticated control.
In each of U.S. Pat. No. 3,592,722 and WO 87/05315 there is disclosed a method of holding off contact between two surfaces, one of which is provided with an adhesive, by locating particles between the surfaces. A disadvantage of such an arrangement if one of the two surfaces is a plastics film which is to be wound into a reel, is that the pressure in a radial direction inwardly towards a central longitudinal axis of the reel resulting from winding of successive turns of the web causes the particles to be forced into the adhesive and become embedded therein thereby reducing the efficacy of the separation provided by the particles. In consequence, the two surfaces are united over a greater area and the reel becomes "blocked", i.e. the turns become adhesively secured one to another with a result that it would be impossible to unwind the reel.
Accordingly, it is an object of the present invention to provide a means of spacing a substance carried on a surface of a substrate from another surface in such a manner as to prevent unintentional contact between the substance and the other surface, the substance and the other surface being contactable one with another only by deforming the substrate and/or the other surface.
A further object of the present invention is to provide simple and inexpensive methods of producing substrates including spacing means.
Another object of the present invention is to provide a method of applying a component to a web of material in such a manner as to form a closure for a bag.
A further object of the present invention is to provide a method of forming a separation means integral with the substrate.
The invention is characterised in that spacing means each having a non-adhesive contactable surface and are non-divergent relative one to another in normal use of the component so as to inhibit contact between the said surface and the said other surface.
Following is a description, by way of example only and with reference to the accompanying drawings, of one method of carrying the invention into effect.
In the drawings:
FIG. 1 is a diagrammatic transverse cross-section of one embodiment of a component in accordance with the present invention,
FIG. 2 is a diagrammatic transverse cross-section of another embodiment of a component in accordance with the present invention,
FIG. 3 is a diagrammatic transverse cross-section of another embodiment of a component in accordance with the present invention,
FIG. 4 is a diagrammatic transverse cross-section of another embodiment of a component in accordance with the present invention,
FIG. 5 is a diagrammatic
REFERENCES:
patent: 3312005 (1962-10-01), McElroy
patent: 4237889 (1980-12-01), Gobran
patent: 4392897 (1983-07-01), Herrington
patent: 4410130 (1983-10-01), Herrington
patent: 4556595 (1985-12-01), Ochi
patent: 5080957 (1992-01-01), Leseman et al.
Bahta Abraham
Ryan Patrick J.
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