Gummed paper

A gummed paper comprises a first substrate having an uncovered region on an upper surface thereof; and a second substrate, in which in a thickness direction, a projection of the second substrate partially covers a projection of the first substrate, a dyne value of an upper surface of the second substrate is greater than or equal to 40 dyn/cm, and a dyne value of the uncovered region is less than the dyne value of the upper surface of the second substrate.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and benefits of Chinese Application No. 201721583288.5, filed on Nov. 23, 2017, the entire content of which is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to the field of gummed papers, and more particularly to a gummed paper.

BACKGROUND

In the coating process, a groove is often required at a certain position of a diaphragm. For this, a laser washing technology is often applied, however, the parameters of the laser washing process are difficult to control, and the yield is low.

SUMMARY

In embodiments of the present disclosure, there is provided a gummed paper, including: a first substrate, having an uncovered region on an upper surface thereof; and a second substrate, in which in a thickness direction of the gummed paper, a projection of the second substrate partially covers a projection of the first substrate, a dyne value of an upper surface of the second substrate is greater than or equal to 40 dyn/cm, and a dyne value of the uncovered region is less than the dyne value of the upper surface of the second substrate.

In embodiments of the present disclosure, the gummed paper further includes: a first adhesive layer, adhered to a lower surface of the first substrate; a second adhesive layer, located between the first substrate and the second substrate and configured to connect the first substrate with the second substrate.

In embodiments of the present disclosure, in a width direction of the gummed paper, an edge of the second substrate is within an edge of the first substrate corresponding to the edge of the second substrate, an edge of the second adhesive layer is within an edge of the first substrate corresponding to the edge of the second adhesive layer; and in a length direction of the gummed paper, an edge of at least one side of the second substrate is within an edge of the first substrate corresponding to the edge of at least one side of the second substrate, an edge of at least one side of the second adhesive layer is within an edge of the first substrate corresponding to the edge of at least one side of the second adhesive layer.

In embodiments of the present disclosure, the dyne value of the uncovered region of the upper surface of the first substrate is less than 40 dyn/cm.

In embodiments of the present disclosure, the uncovered region of the upper surface of the first substrate is fluorinated, or coated with silicone oil, or both fluorinated and coated with silicone oil.

In embodiments of the present disclosure, a distance R between an edge of the first substrate and an edge of the second substrate corresponding to the edge of the first substrate is less than or equal to 20 mm.

In embodiments of the present disclosure, a width of the first adhesive layer is equal to that of the first substrate, and a length of the first adhesive layer is equal to that of the first substrate; or a width of the second adhesive layer is equal to that of the second substrate, and a length of the second adhesive layer is equal to that of the second substrate; or the width of the first adhesive layer is equal to that of the first substrate, the length of the first adhesive layer is equal to that of the first substrate, and the width of the second adhesive layer is equal to that of the second substrate, the length of the second adhesive layer is equal to that of the second substrate.

In embodiments of the present disclosure, the gummed paper further includes a plurality of foaming agent particles distributed in the first adhesive layer, and when the gummed paper is subjected to heat, the plurality of foaming agent particles are foamed, and the two edges of the first substrate in the width direction are curled towards a middle part of the first substrate such that two edges of the first adhesive layer in the width direction are peeled off an object.

In embodiments of the present disclosure, the gummed paper further includes a notch disposed in the width direction of the second substrate, the notch cuts through the first substrate and cuts into the first adhesive layer in the thickness direction, and a depth of the notch is less than or equal to a total thickness of the first substrate and the first adhesive layer.

In embodiments of the present disclosure, the notch disposed in the width direction of the second substrate cuts through the second substrate and cuts into the second adhesive layer, the first substrate and the first adhesive layer, and the depth of the notch is less than or equal to a total thickness of the second substrate, the second adhesive layer, the first substrate and the first adhesive layer.

REFERENCE NUMERALS

DETAILED DESCRIPTION

Explanatory embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the drawings. The same or similar elements and the elements having same or similar functions are denoted by like reference numerals throughout the descriptions and drawings. Though various aspects of the embodiments are shown in the drawings, it is not necessarily to the draw drawings to scale, unless specified otherwise.

The word “exemplary” used herein means that embodiments related thereto are served as examples and are illustrative. Any “exemplary” embodiment described herein is not necessary to be construed to be superior to or better than other examples.

In addition, in order to better explain the present disclosure, numerous specific details are set forth in the following specific embodiments of the present disclosure. It will be appreciated to those skilled in the art that embodiments of the present disclosure can also be implemented without certain specific details. In some embodiments, methods, processes, means, and components that are well known to those skilled in the art are not described in detail, so as to highlight the spirit of the present disclosure.

In the specification, it is to be understood that terms such as “central”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “inner”, “outer”, “vertical”, “horizontal” and “circumferential” should be construed to refer to the orientation as then described or as shown in the drawings under discussion. These relative terms are only for convenience of description, but do not indicate or imply that the device or element referred to must have a particular orientation, or be constructed or operated in a particular orientation, and thus shall not be construed to limit the present disclosure. In addition, terms such as “first” and “second” are used herein for purposes of description and are not intended to indicate or imply relative importance or significance.

As illustrated inFIGS. 1 to 12, embodiments of the present disclosure provide a gummed paper1, including a first substrate12and a second substrate14. In a thickness direction T of the gummed paper, a projection of the second substrate14partially covers a projection of the first substrate12. The first substrate12has an uncovered region16on an upper surface thereof, a dyne value of an upper surface of the second substrate14is greater than or equal to 40 dyn/cm, and a dyne value of the uncovered region16is less than the dyne value of the upper surface of the second substrate14.

In some embodiments of the present disclosure, as illustrated inFIG. 6, the gummed paper1further includes a first adhesive layer11and a second adhesive layer13. The first adhesive layer11is adhered to a lower surface of the first substrate12. The second adhesive layer13is located between the first substrate12and the second substrate14, and the adhesive layer13is configured to connect the first substrate12with the second substrate14, such that a four-layer structure is formed.

Further, the expression “upper surface of the first substrate12” used herein refers to a surface of the first substrate12adjacent to the second substrate14. The expression “lower surface of the first substrate12” used herein refers to a surface of the first substrate12away from the second substrate14(i.e., the surface opposite to the second substrate14). The expression “upper surface of the second substrate14” used herein refers to a surface of the second substrate14away from the first substrate12(i.e., the surface opposite to the first substrate12).

As illustrated inFIGS. 1 to 12, in some embodiments of the present disclosure, the gummed paper1includes the first adhesive layer11, the first substrate12, the second adhesive layer13, and the second substrate14. The first adhesive layer11is configured to adhere to an object2, and the lower surface of the first substrate12is adhered to a surface of the first adhesive layer11opposite to the object2. The second adhesive layer13is adhered to the upper surface of the first substrate12, and the lower surface of the second substrate14is adhered to a surface of the second adhesive layer13opposite to the first substrate12.

As illustrated inFIG. 6, in a same direction, at least one edge of the second substrate14and the second adhesive layer13at a same side is within an edge of the first substrate12corresponding to the at least one edge of the second substrate14and the second adhesive layer13, such that the first substrate12has the uncovered region16on the upper surface thereof. Moreover, the dyne value of the upper surface of the second substrate14is greater than or equal to 40 dyn/cm, and the dyne value of the uncovered region16is less than the dyne value of the upper surface of the second substrate14.

The gummed paper according to the present disclosure has a simple structure, and after slurry is coated on and around the gummed paper, peeling off the gummed paper will not cause the occurrence of warpage around the gummed paper, can obtain a smooth periphery.

In the present disclosure, the term “dyne value” is an indicator of surface energy. In general, a system has a surface tension σ on a surface thereof, and the reversible increase of a surface area of the system by dArequires work σdAunder constant temperature and constant pressure. As the required work σdAis equal to the increase of free energy of the system, and the increase of the free energy of the system is caused by the increase of the surface area, so it is called surface free energy or surface energy. It can also be understood that, as bond energy of an outward chemical bond of an atom at a superficial layer is not compensated, mass points at the superficial layer have extra potential energy than internal mass points, which extra potential energy is called surface energy.

In embodiments of the present disclosure, after the gummed paper1and the object2are coated with slurry, as the dyne value of the uncovered region16is less than the dyne value of the upper surface of the second substrate14, the uncovered region16has a low surface energy, while the upper surface of the second substrate14has a high surface energy, the slurry above the uncovered region16and at an outer edge of the uncovered region16moves slowly towards the upper surface of the second substrate14under an action of the surface tension of the upper surface of the second substrate14. At the same time, if drying the gummed paper1and the object2after the slurry is coated thereon, when a residual solvent in the slurry reaches a certain amount, the slurry above the uncovered region16and at the outer edge of the uncovered region16will not move towards the upper surface of the second substrate14anymore. At this moment, the slurry around the gummed paper1has migrated to the upper surface of the second substrate14, and thus warpage will not occur around the gummed paper1.

In the present disclosure, “in a same direction” used herein refers to a same width direction or a same length direction.

In some embodiments of the present disclosure, the gummed paper1further includes a plurality of foaming agent particles distributed in the first adhesive layer11. As illustrated inFIG. 9, when the gummed paper1is subjected to heat, the plurality of foaming agent particles are foamed, two opposite edges of the first substrate12in the width direction are curled towards a middle part of the first substrate12, thereby effectively controlling a curling direction of the gummed paper1, such that the two edges of the first adhesive layer11in the width direction W of the gummed paper1are partially peeled off the object2. At a later stage of drying, the temperature may be raised appropriately to promote the foaming of the plurality of foaming agent particles in the first adhesive layer11, such that the first adhesive layer11is peeled off from the object2, without occurrence of warpage at the edge where the peeling occurs, i.e., an edge of a reserved region21is flat and smooth, thereby avoiding a belt-broken phenomenon in a subsequent rolling process. In general, the second adhesive layer13does not generally contain the foaming agent particles therein.

Referring toFIGS. 1 to 4and in combination withFIGS. 5 to 12, before a material layer3is coated onto the object2, the first adhesive layer11is adhered to the object2to form a reserved region21. The material layer3is dried after coated on the object2. In this case, the gummed paper1is subject to heat, the plurality of foaming agent particles are foamed, such that the two opposite edges of the first substrate12in the width direction W of the gummed paper1are curled towards the middle part of the first substrate12. The two edges of the first adhesive layer11corresponding to the two curled edges of the first substrate12are detached from the object2and jack up the material layer3at a periphery of the reserved region21at the same time. After the gummed paper1is dried and peeled off, the reserved region21is formed.

In some embodiments of the present disclosure, in the width direction W of the gummed paper1, an edge of the second substrate14is within an edge of the first substrate12corresponding to the edge of the second substrate14, and an edge of the second adhesive layer13is within an edge of the first substrate12corresponding to the edge of the second adhesive layer13. Moreover, in a length direction L of the gummed paper1, at least one edge of the second substrate14and the second adhesive layer13at a same side is within an edge of the first substrate12corresponding to the at least one edge of the second substrate14and the second adhesive layer13.

In some embodiments of the present disclosure, four edges of the second substrate14are within the edges of the first substrate12corresponding to the four edges of the second substrate14, and four edges of the second adhesive layer13are within the edges of the first substrate12corresponding to the four edges of the second adhesive layer13.

In general, the uncovered region16of the gummed paper1may be disposed depending on warpage circumstances. For example, as illustrated inFIG. 6, in a case that the warpage will occur only at one edge of the gummed paper1, the uncovered region16is disposed only at this edge. For another example, as illustrated inFIG. 7, in a case that the warpage will occur at four edges of the gummed paper1, the uncovered region16may be disposed at two edges in the width direction W and at least one edge in the length direction L of the gummed paper1. Alternatively, as illustrated inFIG. 8, the uncovered region16may be disposed at the four edges of the gummed paper1.

In some embodiments of the present disclosure, the dyne value of the uncovered region16of the upper surface of the first substrate12is less than 40 dyn/cm. In some embodiments of the present disclosure, the uncovered region16of the upper surface of the first substrate12is fluorinated, or coated with silicone oil, or both fluorinated and coated with silicone oil, such that the dyne value of the uncovered region16is less than 40 dyn/cm.

The fluorinated surface may be obtained by a fluorinating treatment, i.e., grafting a non-polar functional group, like a fluoro-group or a fluorocarbon group to the surface so as to lower the dyne value (i.e. the surface energy) thereof. Specifically, using fluorine-containing plasma gas, the fluorinating treatment may be performed to a surface of the uncovered region16, or directly to the whole surface of the first substrate12. The fluorine-containing plasma gas may be CF4or a mixture of CF4and CH4.

The silicone oil coated surface may be obtained by coating the uncovered region16with an organic silicone oil, so as to lower the dyne value (i.e. the surface energy). As the molecular chain of the organic silicone oil is flexible, the intermolecular force is small, the silicon-oxygen bond is easily rotated. Oxygen atoms in the skeleton of the molecular chain are adhered to the surface of the uncovered region16of the gummed paper1by an intermolecular force, such that a group, like a methyl group, in the organic silicone oil is oriented and arranged regularly on the surface of the uncovered region16of the gummed paper1. Since the group, like the methyl group, in the organic silicone oil has low electron attractiveness, a surface with a low dyne value (surface energy) can be obtained, and the orientation can be maintained stably in a temperature ranging from −40° C. to 250° C., thereby achieving a stable isolation effect.

In some embodiments of the present disclosure, the organic silicone oil may include at least one selected from a group of polydimethylsiloxane, dimethylcyclosiloxane, aminosiloxane, polymethylphenylsiloxane, or a combination thereof. In some embodiments of the present disclosure, a coating thickness of the organic silicone oil may be between 0.1 μm and 2 μm, and in some embodiments, the coating thickness of the organic silicone oil is between 0.2 μm and 1 μm.

In some embodiments of the present disclosure, the upper surface of the second substrate14may be subjected to a corona treatment, which is an electric shock treatment and allows the upper surface of the second substrate14to have a higher adhesion, thereby enhancing the dyne value (surface energy) of the upper surface of the second substrate14.

In some embodiments of the present disclosure, depending on specific situations, the uncovered region16, or the upper surface of the second substrate14, or both the uncovered region16and the surface of the second substrate14may be subjected to a surface treatment, so that the dyne value of the uncovered region16is less than that of the upper surface of the second substrate14.

In some embodiments of the present disclosure, the first adhesive layer11may include an acrylate adhesive.

In some embodiments of the present disclosure, the first substrate12may include at least one selected from a group of aluminum foil, copper foil, tin foil, nickel foil, silver foil, plastic optical fiber, polyvinyl chloride, polypropylene, polyimide, or a combination thereof.

In some embodiments of the present disclosure, the second adhesive layer13may include an acrylate adhesive.

In some embodiments of the present disclosure, the second substrate14may include at least one selected from a group of polyester resin, plastic optical fiber, polyvinyl chloride, polypropylene, polyimide, or a combination thereof.

In some embodiments of the present disclosure, the foaming agent may be a physical foaming agent or a chemical foaming agent. The physical foaming agent may be selected from long-chain alkane foaming agents, including an isopentane foaming agent, an iso-butane foaming agent, etc. The chemical foaming agent may be selected from a group of azodicarbonamide (AC), azodiisobutyronitrile (AIBN), N,N′-dinitroso-pentamethylenetetramine (DPT), 4,4′-oxybisbenzenesulfonic hydrazine (OBSH), or p-toluenesulfonyl hydrazine (TSH), etc.

Further, in the first adhesive layer11, a curing agent may be added. In some embodiments of the present disclosure, the curing agent may be selected from a group of aliphatic polyamines, alicyclic polyamine, low molecular polyamide, modified arylamine, or isocyanate, etc.

In some embodiments of the present disclosure, a distance R between an edge of the first substrate12and an edge of the second substrate14corresponding to the edge of the first substrate12is less than or equal to 20 mm, and in some embodiments, the distance R is between 0.1 mm and 10 mm.

In some embodiments of the present disclosure, a width of the first adhesive layer11is equal to that of the first substrate12, and a length of the first adhesive layer11is equal to that of the first substrate12. Alternatively, in some embodiments, a width of the second adhesive layer13is equal to that of the second substrate14, and a length of the second adhesive layer13is equal to that of the second substrate141. Alternatively, in some embodiments, the width of the first adhesive layer11is equal to that of the first substrate12, the length of the first adhesive layer11is equal to that of the first substrate12, and the width of the second adhesive layer13is equal to that of the second substrate14, the length of the second adhesive layer13is equal to that of the second substrate14. In this way, it is convenient for die cutting, and it is easy to prepare the gummed paper1.

In some embodiments of the present disclosure, the first adhesive layer11has a thickness ranging from 10 μm to 40 μm, the first substrate12has a thickness ranging from 2 μm to 20 μm, the second adhesive layer13has a thickness ranging from 10 μm to 40 μm, and the second substrate14has a thickness ranging from 2 μm to 20 μm.

In some embodiments of the present disclosure, as illustrated inFIG. 11, the gummed paper1further includes a notch disposed15in the width direction W of the second substrate, the notch15cuts through the first substrate12and cuts into the first adhesive layer11in the thickness direction T, and a depth of the notch15is less than or equal to a total thickness of the first substrate12and the first adhesive layer11.

In the present disclosure, the notch15may be in an S-shape, an L-shape, an I-shape or an X-shape, which will not be specifically limited herein. Further, in some embodiments of the present disclosure, a shortest distance of between two end points of the notch15in the width direction W is less than the width of the gummed paper1.

Further, in embodiments of the present disclosure, as illustrated inFIG. 12, the notch15disposed in the width direction W of the second substrate cuts through the second substrate14and cuts into the second adhesive layer13, the first substrate12and the first adhesive layer11in the thickness direction T, and the depth of the notch15is less than or equal to a total thickness of the second substrate14, the second adhesive layer13, the first substrate12and the first adhesive layer11. Also, in some embodiments of the present disclosure, the shortest distance of between two end points of the notch15in the width direction W is less than the width of the gummed paper1.

According to embodiments of the present disclosure, after the plurality of foaming agent particles in the first adhesive layer11are foamed, two opposite edges of the gummed paper1in the width direction W are curled towards a middle part thereof, and without the occurrence of warpage at the edge where the peeling occurs, thereby effectively solving the problem that the warpage occurs at the periphery of the reserved region21, and avoiding the belt-broken phenomenon in the subsequent rolling process.