The present invention relates to adhesive label sheets, and more particularly to modifications to an adhesive label liner sheet for retaining unneeded label sections on the liner when the label is removed from the liner sheet.
Adhesive label sheets having at least one label and a liner sheet, in which the label is releasably adhered to the liner sheet by a pressure sensitive adhesive, are well known. The pressure sensitive adhesive on the back of the labels is usually, though not necessarily, of sufficient strength as to permanently adhere the label to an object to which the label is later affixed after the label has been peeled from the liner sheet and applied to the object. Such a pressure sensitive adhesive is generally referred to as a permanent pressure sensitive adhesive, as opposed to a releasable pressure sensitive adhesive. Even though the pressure sensitive adhesive is often of the permanent type, the labels can be easily removed from the liner because the liner, often referred to as the release liner, is covered with a non stick coating such as a thin layer of silicone. Labels and label sheets of this type are well known.
Labels of this sort can be manufactured and used in a variety of applications. One application for labels of this type is for use in labeling compact discs (CD's). International Publication WO 02/38371-A 1, assigned to the assignee of the present invention, describes one such label sheet for CD's. The label sheet is of a standard size such as 8½×11 inches, or A4, for feeding through a standard printer attached to a personal computer such as a laser printer or inkjet printer. The facestock contains two CD labels and several CD jewel case spine labels die cut into the facestock so that they can be removed from the remainder of the label sheet when the user is ready to apply the CD label to a CD, or the spine label to a jewel case spine. Also die cut into the facestock sheet are the center holes or cutouts within the center of the CD labels. The facestock includes holding tabs or “no touch tabs” held to the CD, so that the user can hold the CD label while it is being positioned over the CD for application thereon without touching an adhesive surface. The holding tabs are typically removed from the CD label after the CD label has been placed onto the CD by tearing along perforations or cuts and ties formed in the facestock.
The liner also has various die cuts in it for different purposes. Those cuts include: cuts to allow the two halves of the label sheet to be separated for separate handling after printing; a crescent shaped cut at one each of the holding tabs to assist the user in grasping the tab and using it to peel the CD label from the label sheet; and small cross hairs and arcuate sections in the center hole sections of the CD labels for die alignment purposes when setting up the manufacturing equipment. The holding tab having the crescent shaped cut at its end so that the user can easily grasp it and use it to peel the CD label from the label sheet will be referred to as the peel tab. The various cuts in the facestock and the liner sheet are shown and/or described in WO 02/38371-A1.
Even though the die cuts defining the CD label and the center hole section may pass completely through the facestock, the two sections nevertheless sometimes remain stuck slightly together. This is because the pressure sensitive adhesive on the back of the label spreads and interacts with the pressure sensitive adhesive on the back of the center hole section, causing the two sections to stick together slightly at their edges along the die cut boundary. The sticking of the pressure sensitive adhesive on the back side of the two pieces thus tending to hold the two pieces together is sometimes referred to as cohesion. In contrast, the tendency of the facestock to stick to the liner due to the normal action of the pressure sensitive adhesive is usually referred to as adhesion. For clarity of discussion, the terms “cohesion” and “adhesion” will be used herein in accordance with this nomenclature.
Due to the cohesive bond created by the spreading of the pressure sensitive adhesive on the backs of the CD label and the center hole section, when the CD label is peeled from the label sheet the center hole section sometimes coheres strongly enough to the CD label so that the CD label pulls the center hole section with it from the liner. The user must then perform the separate step of removing the center hole section from the CD label after the CD label's sticky side is already exposed.
This separate step can be awkward.
One method which has been suggested for preventing this cohesion problem and ensuring that the unneeded or waste section of the facestock remains on the liner when the label is peeled away, is by the use of skips. Skips are localized areas on the liner in which the release coating is modified, either by using a different release coating that constitutes a less effective non-stick agent, or by completely eliminating the release coating at the skip. The intended result is that the unneeded facestock section remains strongly adhered to the liner while the label is peeled away from the liner, leaving the unneeded section behind. Examples of label sheets or strips employing skips or other techniques that rely on differential bond strengths are U.S. Pat. Nos. 5,580,640; 6,273,987; 6,410,111; 6,423,391; and 6,432,499.
One drawback to the conventional skip approach is that attempting to use different release coatings in different areas, or different thicknesses of the same release coating in different areas, complicates the manufacturing process. The labels sheets are usually made in large continuous rolls, and attempting to create local and repeated small areas in those rolls in which the release coating is different, then applying the facestock, and then aligning those small localized areas with the label patterns later die cut into the sheets, undesirably complicates the manufacturing.
The inventor of the present invention has discovered that by placing one or more cuts in strategic locations in the liner sheet, the center hole section of a label such as a CD label will more reliably be left on the liner sheet when the label is removed from the liner sheet. In one embodiment, the liner sheet is die cut in such a way as to produce a flap which lifts slightly during the removal of the surrounding label. When that occurs, rather than the center hole label section peeling off of the liner with the rest of the label, the liner flap starts to lift with the center hole label section. When the peeling action reaches the end of the flap, the flap can no longer lift with the facestock sheet. Now there is an entire line through the center hole section along which the adhesive force between the facestock and the liner must be overcome. This adhesive resistance pulls at the center hole section at the two points along the peel line at which the center hole section coheres to the surrounding label. The adhesive force holding the center hole section to the liner is now sufficiently strong to overcome the cohesive force holding the center hole section to the label at the two outer points of the center hole section, and the center hole section begins to separate from the label. Now that the cohesive bond between the center hole section and the label has broken at the two points, the separation process continues rapidly until the flap and the waste facestock portion on the flap separates from the label. The peeling process then continues smoothly and the center hole section is left behind on the liner sheet.
In another view of the present invention, when the liner flap created by the cut in the liner begins to lift, the center hole label section now must be removed by shearing part of the center hole label section from the liner. The force required to remove a label from a surface by pulling it sideways in shear is greater than what is required for peeling the label. The cohesive bond between the label and the center hole label section does not exceed the force required to shear the center hole label section off of the liner, so the cohesive bond is broken and the center hole label section stays on the liner.
In one aspect therefore, the present invention takes a counter intuitive approach to separating the donut hole from the label. Namely, the present invention recognizes that, rather than increasing the force tending to separate the donut hole from the label as taught by prior art skip techniques, one way of ensuring reliable separation of the donut hole from the label is to initially decrease the separation force within a localized area. More specifically, the force tending to separate the donut hole from the surrounding label is initially decreased at a leading edge of the donut hole first reached by the peel line as the peel line progresses across the label.
The method and structure of the invention are particularly effective where the direction of removal of the surrounding label is consistent and known, such as in label sheets produced by the assignee of the present invention in which one or more peel tabs is provided to assist the user in peeling the label from the liner. Where the direction of peel is not consistent, a plurality of cuts may be made in the liner to facilitate separation of the center hole section from the label regardless of the direction of peel.
The present invention can be used for a variety of label sheets in which the label has a cutout therein. For example, in addition to a CD label sheet, the invention can be used for a name badge label sheet in which a hanger hole must be removed from the label. The invention can also be used in a label sheet in which an unneeded or waste section of the label sheet which is desired to be left behind is not necessarily a cutout within a single label. For example, the invention can be used in a label sheet having adjacent generally rectangular labels, with the labels having rounded corners such that an unneeded diamond shaped portion lies at the point where four of the rectangular labels meet. More generally, the invention can be used whenever there is an unneeded facestock section such that it is desirable to remove the label without also lifting the unneeded or otherwise adjacent facestock section with the label.
In another aspect, the invention is of a label sheet having a modified liner, the liner assisting an unused portion of the label being left behind when the label is peeled away from the label sheet, the modification including a cut in the liner, the cut including at least a first cut portion running along a boundary between the label and the unused portion and running underneath the unused portion, and second and third cut portions which curve to cross the boundary near the end points of the cut, thus creating a flap which partially lifts at first away from the general plane of the liner sheet when the label is being peeled away, the cut thereafter assisting the unused portion in separating from the label and remaining on the liner sheet as the label is being removed from the liner sheet. The label sheet can optionally have a tab, printed directions, arrows, or other means for encouraging a user to peel the label off from the liner in a predefined peel direction, with the cut and the peel tab cooperating together to ensure that the peeling progresses in a way that will first lift the leading edge of the flap, and finally reach the hinge of the flap at its rear.
In a further aspect the invention is of a label sheet having a facestock and a liner, the facestock sheet including a label and an unneeded portion lying at least partially internal to the label, the liner sheet being cut near the boundary area between the label and the unneeded portion in order to create a flap that allows the following steps to occur in sequence as a user is removing a label from the liner sheet: (a) a first corner of the internal portion is pulled upward away from a primary plane of the liner sheet, the first corner remaining adhered to a corresponding section of the liner sheet not lying within the primary plane; (2) the internal portion begins separating from the label; and (3) the internal portion completely separates from the label and is left behind on the liner sheet.
In yet another aspect the invention is of a method for altering the liner sheet such that, when a label is being peeled away from the liner sheet, the label having an internal portion that is not intended to be used as a label, a tensile force that would otherwise act to begin removing a leading corner of the internal portion is initially reduced, with the leading corner not being removed from the liner until the peel line has passed by that leading corner.
One advantage of this invention is that, when the liner sheet is already to be cut for some other purpose as in previous manufacturing processes, the center hole section can be induced to reliably separate from the label by the use of a simple and inexpensive cut which does not require any additional manufacturing steps.
Exemplary embodiments of the invention will be further described below with reference to the drawings, in which like numbers refer to like parts.
A typical label sheet includes a facestock sheet and a liner sheet. The facestock sheet includes one or more labels die cut therein, and one or more unused or waste portions of the facestock. The facestock is usually made of paper which may be written upon or printed upon by a laser printer or other printer attached to a personal computer, although the facestock material may be a printable metal foil, paper/metal foil, MYLAR®, plastic, or any other suitable material. For purposes herein, all such materials will be referred to as paper, and the assembly will be referred to as a paper assembly. A printable coating, such as an inkjet receptive coating, may be applied to the top surface so that the surface can be printed thereon. For purposes herein, it will be understand that the term “printing” includes writing by pen or ink, typewriting, laser printing, ink jet printing, or any other manner of placing text or graphics thereon. The facestock sheet has a pressure sensitive adhesive on it which typically is strong enough to permanently adhere to whatever the label is placed on after being removed from the liner. The liner, however, is coated with a nonstick release material such as a thin layer of silicone so that the label can be easily peeled from the liner. It is not necessary that the pressure sensitive adhesive be a permanent pressure sensitive adhesive; it can be a removable adhesive i.e., a weak pressure sensitive adhesive. The foregoing is well known within the art of label sheet manufacturing.
Label sheets may come in a variety of configurations. In
The cuts shown in phantom in
The structure of the liner 12 including modifications thereto according to the one embodiment of the present invention will now be described in greater detail with reference to
Flap 58, cut 40 in liner 12, and boundary crossings 43 and 49 are most advantageously oriented as shown in
Without cut 40, as with prior art labels, when the peeling of the label progressed along the peel direction to reach leading edge 36 of the donut hole 30, the adhesive on the back of label 20 and donut hole 30 created a cohesive force that tended to hold donut hole 30 to label 20 as label 20 was being peeled away from liner 12. At the leading edge of donut hole 30 only a small area of donut hole 30 opposed the cohesive force. The cohesive force along the boundary at leading edge 36 would be stronger than the adhesive force tending to hold donut hole 30 to liner 12, thus causing donut hole 30 to begin peeling away from liner 12 without separating from label 20. Once started, this peeling of donut hole 30 with label 20 up from liner 12 would normally continue until entire donut hole 30 was removed from liner 12, still attached to label 20 by cohesion.
With cut 40, a different sequence occurs. As the peel line is progressing in the peel direction shown in
In
In
In
In the embodiment shown in
A fourth environment and fourth embodiment are shown in
The present invention is useful in facilitating separation of donut holes from labels where the donut hole or other hole lies completely internal to a label. However, the invention can also be used in applications where the unused section is not completely internal to the label.
It will be appreciated that the term “present invention” as used herein should not be construed to mean that only a single invention having a single essential element or group of elements is presented. Rather, any new and nonobvious element, and any new and nonobvious combination of elements, constitutes a separate invention. Although the present invention has thus been described in detail with regard to the preferred embodiments and drawings thereof, it should be apparent to those skilled in the art that various adaptations and modifications of the present invention may be accomplished without departing from the spirit and the scope of the invention. For example, the principles of the present invention can be used with many shapes and configurations of labels and unneeded sections, and with many different materials and types of adhesives and release coatings. Although the shapes of the cuts illustrated herein have been found to be particularly advantageous, the invention is not necessarily limited to particularly shaped cuts. Similarly, peel tabs can come in many shapes and configurations, and the term “peel tab” as used in the claims should not be limited to any particular shape or configuration. Accordingly, it is to be understood that the detailed description and the accompanying drawings as set forth hereinabove are not intended to limit the breadth of the present invention, which should be inferred only from the following claims and their appropriately construed legal equivalents. In the claims, where the term “means for” appears, that phrase is intended to be interpreted in accordance with 35 U.S.C. § 112, paragraph 6; similarly, where the term “means for” does not appear in a claim, the claim is intended to not be interpreted under 35 U.S.C. § 112, paragraph 6.
This application is a continuation of U.S. patent application Ser. No. 11/165,745 filed Jun. 24, 2005 which is a continuation-in-part of international application no. PCT/US03/01808, filed Jan. 22, 2003, which designated the United States and was published in English each of which are incorporated by reference in their entireties.
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Number | Date | Country | |
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20180118979 A1 | May 2018 | US |
Number | Date | Country | |
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Parent | 11165745 | Jun 2005 | US |
Child | 15857749 | US |
Number | Date | Country | |
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Parent | PCT/US03/01808 | Jan 2003 | US |
Child | 11165745 | US |