Apparatus and Method for Testing Liner and Label Separation

Abstract

An apparatus for testing label-liner separation is provided. The apparatus comprises a roller, a plurality of replaceable printer peel bars, and a weight. Each peel bar associated with its own unique radius for its disengage edge. A label-liner web is fed under the roller and up to a given peel bar of a given radius over the corresponding disengage edge. A string is attached on one end to a liner portion of the web and the weight is attached to the other end of the string with the weight freely hanging unsupported under the liner portion. A label portion of the web is pulled over the disengage edge to determine whether the label portion separates from the liner portion of the web during the pulling. If no separation occurs a different peel bar with a different radius is selected and tried. This repeats until separation is achieved.

Claims

1. (canceled)

2. A method, comprising: positioning a replaceable printer peel bar having a predefined radius into a base element of an apparatus, wherein the replaceable printer peel bar comprises a disengage edge; feeding a label-liner web comprising a label portion and a liner portion under a roller integrated into the base element and toward the replaceable printer peel bar at a predefined angle; directing the label-liner web over the disengage edge of the replaceable printer peel bar; attaching a first end of a string to a backside of the liner portion past the disengage edge; attaching a weight to a second end of the string; applying tension to the label portion to urge the label portion away from the disengage edge while the weight applies a constant downward force on the backside of the liner portion; and determining whether the liner portion separates from the label portion during the applying of tension.

3. The method of claim 2, wherein the feeding comprises driving the roller with a motor to automatically urge the label-liner web along a track from an infeed of the base element towards the replaceable printer peel bar.

4. The method of claim 2, wherein the attaching the weight comprises attaching a calibrated weight of 12 grams that hangs freely from the second end of the string.

5. The method of claim 2, wherein the positioning comprises selecting the replaceable printer peel bar from a plurality of replaceable printer peel bars having stepped radiuses ranging from 0.01 inches to 0.10 inches.

6. The method of claim 2, wherein the directing comprises feeding the label-liner web over the disengage edge at the predefined angle, wherein the roller comprises a 2-inch diameter roller with bearings positioned below the disengage edge.

7. The method of claim 2, further comprising adjusting a position of the roller within the base element to change the predefined angle at which the label-liner web is fed from the roller to the replaceable printer peel bar prior to the directing.

8. The method of claim 2, wherein the determining comprises observing whether the liner portion falls downward along a front side wall of the replaceable printer peel bar while the label portion continues in a straight line away from the disengage edge.

9. The method of claim 2, further comprising placing the replaceable printer peel bar on a shelf situated above the roller at the predefined angle prior to the feeding, wherein the shelf is comprised in the base element.

10. A method comprising: aligning a leading edge of a label-liner web under a roller of an apparatus; urging the leading edge of the label-liner web from under the roller and up over a disengage edge of a first replaceable printer peel bar having a first radius at a predefined angle; affixing a string to a backside of a liner portion of the label-liner web past the disengage edge, wherein a weight is attached to the string; pulling a label portion of the label-liner web up and away from the disengage edge; determining whether the label portion separates from the liner portion during the pulling; when the liner portion fails to separate from the label portion, replacing the first replaceable printer peel bar with a second replaceable printer peel bar having a second radius different from the first radius; and repeating the urging, the pulling, and the determining with the second replaceable printer peel bar until separation between the label portion and the liner portion is achieved with a specific replaceable printer peel bar having a specific radius.

11. The method of claim 10, wherein the replacing comprises selecting the second replaceable printer peel bar from a plurality of 10 replaceable printer peel bars, wherein each replaceable printer peel bar has a radius that is 0.01 inches greater than a previous replaceable printer peel bar.

12. The method of claim 10, wherein the aligning comprises manually feeding the label-liner web along a track from an infeed of the apparatus under the roller.

13. The method of claim 10, wherein the affixing comprises attaching the string on a top end to the backside of the liner portion while a weight of 12 grams hangs freely from a bottom end of the string.

14. The method of claim 10, wherein the specific radius is 0.04 inches or higher, indicating optimal separation for the label-liner web.

15. The method of claim 10, wherein the urging comprises feeding the label-liner web from under a 2-inch diameter roller with bearings positioned at the predefined angle below the disengage edge.

16. The method of claim 10, wherein the determining comprises evaluating whether stiffness of the label portion overcomes a bond between an adhesive coating on a backside of the label portion and a release coating on a front side of the liner portion.

17. The method of claim 10, further comprising iterating the replacing, the urging, the pulling, and the determining by progressing through replaceable printer peel bars with increasing radiuses until the separation is achieved.

18. A method, comprising: inserting a replaceable printer peel bar having a predefined radius into a base element of a peel bar apparatus, wherein the replaceable printer peel bar is one of a plurality of replaceable printer peel bars with variable radiuses; feeding a web of a given label-liner product under a roller integrated into the base element, over a disengage edge of the replaceable printer peel bar, and out of the base element at a predefined angle; attaching a constant weight to a string that is affixed to a backside of a liner of the web past the disengage edge, wherein the constant weight applies a downward force on the backside of the liner; and pulling a label of the web over the disengage edge to determine whether the liner separates from the label when the label is dispensed over the disengage edge with the predefined radius.

19. The method of claim 18, wherein the feeding comprises operating a motor configured to drive the roller to automatically urge the web along a track from an infeed towards the replaceable printer peel bar.

20. The method of claim 18, wherein the plurality of replaceable printer peel bars comprises stepped radiuses and further comprising swapping the replaceable printer peel bar with a different replaceable printer peel bar from the plurality when the liner fails to separate from the label during the pulling.

21. The method of claim 18, further comprising adjusting a position of the roller and correspondingly adjusting the predefined angle with which the web is fed from the roller to the replaceable printer peel bar and over the disengage edge within the base element prior to the feeding.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 is a diagram of an apparatus for testing liner and label separation, according to an example embodiment.

[0009] FIG. 2 is a diagram illustrating a printer peel bar with proper liner and label separation, according to an example embodiment.

[0010] FIG. 3A is a diagram of another printer peel bar with proper liner and label separation, according to an example embodiment.

[0011] FIG. 3B is a diagram of still another printer peel bar with no separation between the liner and label, according to an example embodiment.

[0012] FIG. 4 is a diagram of a method for operating the apparatus, according to an example embodiment.

DETAILED DESCRIPTION

[0013] FIG. 1 is a diagram of an apparatus 100 for testing liner and label separation, according to an example embodiment. It is noted that the diagram is shown in greatly simplified form with only the components necessary for understanding the apparatus shown. Other components may be added and/or the shown components may be rearranged without departing from the teachings and beneficial aspects of testing liner and label separation.

[0014] As used herein a liner comprises a substrate made of a translucent or film and is coated with a release coating before being aligned and affixed to a backside of a label. The terms and phrases liner and liner substrate may be used synonymously and interchangeably herein and below.

[0015] A label comprises a separate substrate from the liner and a backside of the label is coated with an adhesive before being aligned and affixed to a front side of a liner. The label may or may not also include additional coatings on the front side of label, such as and by way of example only, thermal sensitive coatings to permit a front side and/or portions of a backside of the label to be thermal imaged by thermal printers. The terms and phrases label, face stock, face, and label substrate may be used synonymously and interchangeably herein and below.

[0016] Apparatus 100 comprises replaceable peel bars of various radiuses 101, a base component 110, and a roller 120. Apparatus 100 may also comprise a calibrated weight 300.

[0017] Roller 120 is arranged and oriented within base 100 to receive a label-liner web 200 under a bottom portion of roller 120 and direct a leading edge of web 200 at a predefined angle over replaceable peel bar 101 and out of base 110 (egress or dispense point of apparatus 100).

[0018] In an embodiment, web 200 is fed under roller 120 and pulled over a selected replaceable peel bar 101 through and out away from the base 110.

[0019] A calibrated weight 300 is attached to a string 301 and the string 301 is affixed to the underside and backside of the liner 202 (see FIG. 2).

[0020] In an embodiment, the calibrated weight 300 is 12 grams.

[0021] In an embodiment, an operator of apparatus 100 holds a leasing edge of web 200 by label or face portion for label 201 (see FIG. 2) and pulls the web 200 out away from apparatus 100. Assuming the combination of label stiffness and adhesive with release coatings are sufficient, the liner 202 falls down along a front side wall of peel bar 101 and separates from the label 201.

[0022] FIG. 2 illustrates a printer peel bar 101 with proper liner 202 and label 201 separation from web 200, according to an example embodiment. Peel bar 101 has a predefined radius 105 (illustrated by the arrow above 105 in top leftmost corner of peel bar 101). The smaller the radius 105 is the sharper the angle is over dispense edge 106. Web 200 comprises the face stock 201 (label substrate 201) and the liner 202 (liner substrate 202). The web 200 is urged over a top surface 103 of peel bar 101 while a leading edge of the face stock 201 is pulled. String 301 with weight 300 exerts a known and measurable force on liner 202 downward along a front side wall of peel bar 101 and liner 202 separates from label 201.

[0023] FIG. 2 illustrates that the stiffness of label substrate 201 is sufficient to over come the bond (the release force) needed to separate liner 202 from label 201 and optimal to allow liner 202 and label 201 to separate with peel bar 101 having radius 105.

[0024] Weight 300 is a constant known peel force applied to the back side of liner 202, the release coating on the front side of liner 202 is also known during testing for the web 200 as is the adhesive coating on the backside of label 201, thus, the only variable changed during operation of apparatus 100 for testing label 201 and liner 202 separation of a given web 200 (label-liner product) is the radius 105 (angle over dispense edge 106) of peel bar 101. If liner 202 does not separate from label 201 with a given peel bar of a given radius 105, then a peel bar 101 having a different radius 105 is inserted into apparatus 100 and the test continues with the next radius 105.

[0025] There is a direct correlation between the radius 105 chosen for a given peel bar 101 and both the release force needed to separate liner 202 from label 201 and/or the stiffness of the face stock 201 (label 201). This is illustrated in FIG. 1 at the top of the diagram under the various replaceable peel bars 101 with varying radiuses. For example, if a given web 200 (label-liner product 200) is being tested through operation of apparatus 100 with a given peel bar 101 having a given radius and fails to allow liner 202 to separate from liner 202 either the mixture or composition of the release and adhesive coatings have to be changed to decrease the release force and/or the stiffness of the face stock 201 has to change. That is in this situation, the release force has to be decreased between the label 201 and the liner 202, the face stock 201 has to be changed to one that is less stiff, or a combination is needed for a lower release force and a less stiff face stock 201 for the given web 200 and given peel bar 101 with the given radius.

[0026] FIG. 3A is a diagram of another printer peel bar 101 with proper liner 202 and label 201 separation, according to an example embodiment. As the web 200 is pulled over the top surface 103 to dispense a given label 201 over dispense edge 106, radius 105 of peel bar 101 permits separation of liner 202 from label 201 from web 200 with liner web 202 falling down towards weight 300 along the front edge and surface of peel bar 101. This indicates that for any printers having a peel bar 101 with a radius of 105 when using web 200, label 202 will separate from liner 202 and permit liner 202 to be wound in a liner waste spool within the printer.

[0027] In FIG. 3A because the radius 105 of peel bar 101 is small (sharp angle), liner 202 travels around dispense edge 106 and the stiffness of the face stock 201 overcomes the bond between the adhesive on the backside of label 201 and the release coating on the front side of liner 202 permitting label 201 to travel in a straight line and dispensing away liner 202; and liner 202 is properly wound in a liner waste spool within a printer.

[0028] FIG. 3B is a diagram of still another printer peel bar 101 with no separation between the liner 202 and label 202, according to an example embodiment. A larger radius (gradual curved angle) causes the face stock 201 to follow liner 202 over the dispense edge 106 of peel bar 101 and not separate. In this cases the face stock 201 stiffness is insufficient to overcome the bond between the adhesive of the face stock 201 and the release coating of liner 202. This means that the bond between the release coating and the adhesive coating needs to be decreased if the peel bar 101 with radius 105 is needed for a given printer and/or the stiffness of face stock 201 needs increased.

[0029] Apparatus 100 permits testing of label-liner products 200 for specific printers having specific peel bars with specific radiuses. Testing enables a label manufacturer to determine whether the release coating, adhesive coating, and/or stiffness in the face stock 201 of the products 200 need to be modified. Modifications to the release coating and/or adhesive coating alters the release force or bond between the backside of label 201 and the front side of liner 202.

[0030] As the radius 105 of replaceable peel bars 101 get smaller (sharper dispense angle 106) without label 201 and liner 202 separation from a given web 200 using apparatus 100, the more stiffness is needed in the face stock/label 201.

[0031] As the radius of 105 of replaceable peel bars 102 get larger without label 201 and liner 202 separation from a given web 200 using apparatus 100, the less stiffness is needed in the face stock/label 201.

[0032] In addition, when a given radius of a replaceable peel bar 102 fails to obtain label 201 and liner 202 separation from a given web 200 using apparatus, the release coatings and/or adhesive coatings can be changed to achieve a weaker bond (require less release force) between label 201 and liner 202.

[0033] So both increased or decreased face stock/label 201 stiffness and/or weakened bonds via the release and adhesive coatings can be changed in a label-liner produce when a known peel bar 101 having a known radius 105 of a given printer is required.

[0034] Apparatus 100 permits peel bars 101 of variable radiuses to be swapped in and out of base 110 for purposes of testing a proper dispensing of a label 201 for a given label-liner product 200. The industry has been unable to provide such a label dispensability testing mechanism and as such label manufacturers may find that significant investments in new or changed label-liner products are unable to properly dispense from their customer printers before the products or product changes are released. Apparatus 100 permits label manufactures to know (not guess or hope) in advance whether a new or changed label-liner product 200 will dispense for their customers'printers such that if changes are needed for label dispensing the changes can be made before release of the products 200. Apparatus 100 also permits label manufacturers to customize label-liner products 200 for specific printers for optimal operation of such printers when dispensing labels 201 and when spooling liner 202.

[0035] In an embodiment, apparatus 100 comprises a motor that drives roller 120 urging web 200 automatically towards peel bar 101 and over dispense edge 106.

[0036] In an embodiment, apparatus 100 comprises an adhesive chain under peel bar 101 that adheres to a backside of liner 202 on one end and the other end applies or comprises force (weight 300).

[0037] In an embodiment, roller 120 is a 2 inch in diameter roller with bearings.

[0038] In an embodiment, weight 300 can be changed as needed.

[0039] In an embodiment, a position of roller 120 and correspondingly an angle with which web 200 is fed from roller 120 to peel bar 101 and over dispense edge 106 s adjustable within base 110 of apparatus 100.

[0040] In an embodiment, an optimal label 201 and liner 202 separation for any given label-liner product 200 is one in which the separation occurs with a peel bar 101 having a radius of 0.04 or higher. In an embodiment, apparatus 100 is used to test any stiffness of face stock 201 and any bond between face stock 201 and liner 202 for all released changed or new label-liner products 200 to ensure label 201 and liner 202 separation on any peel bar 101 having the radius of 0.04 or higher and modifications are made when no separation is achieved in the stiffness and/or the bond (via the release coating and/or adhesive coatings).

[0041] FIG. 4 is a diagram of a method 800 for operating apparatus 100, according to an example embodiment.

[0042] At 410, a leading edge of a label-liner web 200 is aligned under a roller 120 of an apparatus 100.

[0043] At 420, the leading edge of web 200 is urged under the roller 120 and up at a predefined angle within the apparatus 100 over a disengage edge 106 of a replaceable printer peel bar 101 inserted into the apparatus 100.

[0044] At 430, a first end of a string 301 is affixed to a backside of a liner portion 202 of the web 200 past the disengage edge 106.

[0045] At 440, a second end of the string 301 is affixed to a weight 300.

[0046] At 450, a label portion 201 of the web 200 is urged up and away from the disengage edge 106 to determine whether the label portion 201 of the web 200 separates from the liner portion 202 during 450.

[0047] In an embodiment, at 460, the peel bar 101 is replaced with a different peel bar 101 having a different radius from that which was associated with the original peel bar 101 when the liner portion 202 fails to separate from the label portion 201 during 450. 450 is repeated with the different peel bar 101. 460 and 450 are iterated until a specific peel bar 101 with a specific radius results in the liner portion 202 separating from the label portion 201 during 450.

[0048] Although the present invention has been described with particular reference to certain preferred embodiments thereof, variations and modifications of the present invention can be affected within the spirit and scope of the following claims.