Double sided laminating machine

Claim 3

A method as defined in Claim 1, in which said films are preheated to a temperature in the range of about 200°-220° F and the laminating rollers are maintained at a temperature in the range of about 250°-260° F.

Claim 4

A method as defined in Claim 2, in which said laminating rollers have exposed surfaces consisting of a synthetic resin polymer having areas of chromium interspersed therein.

Claim 5

A method as defined in Claim 1, 2 or 3, further characterized by contacting said laminated film article with a pair of compressible driven pull rollers downstream of said laminating rollers to pull the laminated film articles through the laminating rollers, which are adjustable by fluid pressure, and adjusting the fluid pressure on the pull rollers to vary the effective diameter of the pull rollers and thereby the speed of said pull rollers.

Claim 6

A method as defined in Claim 4, further characterized by driving one of said laminating rollers and one of said pull rollers while the other of said laminating rollers and said pull rollers are freely rotated.

Claim 7

A method as defined in Claim 1, 2 or 3, in which said films are contacted with freely-rotating preheat rollers to preheat the film.

Claim 9

A continuous laminating system for double laminating an article comprising a pair of laminating rollers in pressure-engaging contact with each other to form a nip through which an article to be laminated is fed; heating means for heating said laminating rollers; a pair of film supply rolls, each supplying a continous web of laminating film with heat activatable adhesive thereon into said nip; a first pair of pull rollers spaced from and aligned with said laminating rollers, and drive means for driving said rollers, the improvement of preheat means engaging said webs of film between said supply rolls and said laminating rollers for preheating said film to a temperature below the adhesive activating temperature.

Claim 10

A continuous laminating system for double laminating an article comprising a pair of laminating rollers in pressure-engaging contact with each other to form a nip through which an article to be laminated is fed; heating means for heating said laminating rollers; a pair of film supply rolls, each supplying a continous web of laminating film with heat activatable adhesive thereon into said nip; a first pair of pull rollers spaced from and aligned with said laminating rollers, and drive means for driving said rollers, the improvement of preheat means engaging said webs of film between said supply rolls and said laminating rollers for preheating said film to a temperature below the adhesive activating temperature.

Claim 11

A continous lamianting system as defined in Claim 8, in which said heating means includes means for circulating a heated incompressible fluid through said laminating rollers for heating said webs of film above the temperature of said preheat means to activate said adhesive.

Claim 12

A continous laminating system as defined in Claim 8, in which said preheat means includes a hollow member for each web and defining an arcuate surface engaging the web and means for circulating a heated incompressible fluid through said hollow member.

Claim 13

A continous laminating system as defined in Claim 8, in which said preheat means includes rotatable preheat rollers engaging said webs of film and a heated incompressible fluid in said preheat rollers.

Claim 14

A continous laminating system as defined in Claim 11, further including means for circulating said heated incompressible fluid through said preheat rollers.

Claim 15

A continuous laminating system as defined in Claim 8, further including a second pair of pull rollers downstream of the first pair of pull rollers with edge trimming means between said first and second pair of pull rollers and edge cooling means upstream of said edge trimming means.

Claim 16

A continuous laminating system as defined in Claim 8, in which said laminating rollers have exposed surfaces consisting of a synthetic resin polymer having areas of chromium interspersed therein.

Claim 17

A continuous laminating system as defined in Claim 8, in which one of said laminating rollers and one of said pull rollers are driven by said drive means with the other of said laminating rollers being adjustable by pressurized fluiud cylinders, and in which at least said pull rollers are formed from a compressible resilient material, the improvement of means for varying the pressure of the fluid in said cylinders to thereby vary the effective diameter of said pull rollers to vary the speed of said pull rollers with respect to said laminating rollers.

Claim 18

A continuous laminating system for laminating an article comprising a pair of resilient laminating rollers in pressure-­engaging contact with each other to form a nip through which an article to be laminated is fed; a pair of film supply rolls, each supplying a continous web of laminating film with heat activatable adhesive thereon into said nip; a pair of resilient pull rollers spaced from and aligned with said laminating rollers; and common drive means for driving one of said laminating rollers and one of said pull rollers, first adjustable fluid cylinder means cooperating with the other of said laminating rollers and second adjustable cylinder means cooperating with the other of said pull rollers, and means for supplying pressurized fluid to said first and second adjustable cylinder means, the improvement of means for varying the pressure of the fluid to said second cylinder means to vary the effective diameter of said pull rollers and thereby vary the speed of said pull rollers with respect to said laminating rollers.

Claim 19

A continuous laminating system for laminating an article comprising a pair of resilient laminating rollers in pressure-­engaging contact with each other to form a nip through which an article to be laminated is fed; a pair of film supply rolls, each supplying a continous web of laminating film with heat activatable adhesive thereon into said nip; a pair of resilient pull rollers spaced from and aligned with said laminating rollers; and common drive means for driving one of said laminating rollers and one of said pull rollers, first adjustable fluid cylinder means cooperating with the other of said laminating rollers and second adjustable cylinder means cooperating with the other of said pull rollers, and means for supplying pressurized fluid to said first and second adjustable cylinder means, the improvement of means for varying the pressure of the fluid to said second cylinder means to vary the effective diameter of said pull rollers and thereby vary the speed of said pull rollers with respect to said laminating rollers.