JP6163618B1 - Self-adhesive film and method for producing the same - Google Patents

Abstract

The present invention provides a self-adhesive film having ease of peeling and re-sticking property while maintaining the state of sticking, and a method for producing the same. A self-adhesive film 10 includes a film-like base layer 20 having a front surface 21 and a back surface 22, and a self-adhesive layer formed on the back surface 22 of the base material layer 20 and pasted on a surface 101 of a member to be pasted 100. 30. The tab portion 20b is inclined toward the surface 21 of the base material layer 20 with respect to the label portion 20a. [Selection] Figure 1

Description

  The present invention relates to a self-adhesive film and a method for producing the same.

  The vending machine is installed in a state where a plurality of product samples arranged in an array are displayed in the display space, and the purchaser selects a transparent front cover (transparent flat glass or plate-like plastic, hereinafter referred to as a transparent front cover). The product is purchased by operating the purchase button corresponding to the desired product sample while viewing the product sample.

  In order to increase buyers' willingness to purchase goods, self-adhesive films such as labels are used as point of purchase advertising (POP) on the surface of a member to be pasted such as a transparent front cover (display space on the transparent front cover and Is affixed to the opposite side) or back side. Since the self-adhesive film affixed to the surface of the material to be applied is always placed in a state that is easily exposed to rain and wind and is easily touched by the purchaser, the self-adhesive layer of the self-adhesive film is in such a state. It is necessary to have an adhesive force that does not peel off (sticking state maintainability). Moreover, the self-adhesive film stuck on the back surface of the member to be stuck is mirror-image printed.

  When a purchaser purchases a product, the self-adhesive film is located between the purchaser and the product sample, so the advertising effect of the design on the appearance of the target product sample and the surrounding product sample is sufficient. A self-adhesive film is applied to the transparent front cover so that it can be demonstrated. For example, the self-adhesive film is affixed to a position almost in front of the top of the target product sample, that is, a position where the target product sample and the surrounding product sample are not easily shaded by the self-adhesive film (strict sticking position). sex).

  However, it is often difficult for an operator who replenishes a product to a vending machine to stick a self-adhesive film on a transparent front cover between product replenishments, and to apply it accurately at an appropriate position.

  In addition, when removing the target product sample according to the sales of the product from the vending machine, it is necessary to quickly remove the corresponding self-adhesive film from the transparent front cover (ease of peeling).

  In addition, when moving the position of the product sample within the display space according to the sales of the products from the vending machine, the corresponding self-adhesive film is quickly peeled off from the transparent front cover (easy to peel off), and a new It is necessary to perform a re-sticking operation to put a self-adhesive film at a position (re-stickability).

  In order to make it easy to peel off the adhesive film from the surface of the member to be adhered (easy to peel), there is known an adhesive film in which the shape of the base material layer is composed of a label portion and a tab portion extending from the periphery of the label portion. (For example, refer to Patent Document 1 and Non-Patent Document 1).

Japanese Patent No. 3645034

http://www.insatsu-pro.com/products/pop/v-machine/front-balloon.html

  However, in general, in order to improve the sticking state maintainability, the adhesive force of the adhesive layer is strengthened, so that the ease of peeling is low. For this reason, it will peel from the edge of the sticking adhesive film using an operator's nail | claw or a resin spatula, etc., and the time of peeling work will be required.

  An object of the present invention is to provide a self-adhesive film having ease of peeling and a method for producing the same.

  The self-adhesive film stuck on the surface of a to-be-bonded member based on this invention is formed in the film-like base material layer which has a surface and a back surface, and the back surface of the said base material layer, and is affixed on the surface of the said to-be-bonded member. A self-adhesive layer. The base material layer has a label portion and a tab portion extending from the periphery of the label portion. The tab portion is inclined toward the surface side of the base material layer with respect to the label portion.

  In the back surface of the base material layer, the area of the back surface of the tab portion is preferably smaller than the area of the back surface of the label portion.

  It is preferable that a streak-like recess is formed between the label portion and the tab portion on the surface of the base material layer.

  The ratio (L / W) of the distance (L) from the periphery of the label portion to the tip of the tab portion and the length (W) of the streak-like recess is preferably 0.5 to 2.0. .

  The manufacturing method of the self-adhesive film according to the present invention includes a step of plastically deforming the base material layer so that the tab portion is inclined toward the surface side of the base material layer with respect to the label portion.

  According to the present invention, since the tab portion is inclined toward the surface side of the base material layer with respect to the label portion, a self-adhesive film having ease of peeling and a method for producing the same can be provided.

It is a figure explaining the state which stuck the self-adhesive film which concerns on this invention on the surface of a to-be-bonded member, (a) is a top view, (b) is a fragmentary sectional view. It is a fragmentary sectional view explaining the manufacturing method of the self-adhesive film shown in FIG. (A) shows a state before cutting, and (b) shows a cut state.

  As shown in FIG. 1, the self-adhesive film 10 according to the present invention is a self-adhesive film that is attached to the surface 101 of the member to be attached 100, and has a film-like base material layer 20 having a front surface 21 and a back surface 22, The self-adhesive layer 30 formed on the back surface 22 of the base material layer 20 and attached to the front surface 101 of the member to be pasted 100 is provided. The base material layer 20 is a tab extending from the periphery of the label portion 20a and the label portion 20a. The tab portion 20b is inclined to the surface 21 side of the base material layer 20 with respect to the label portion 20a. Hereinafter, embodiments of the self-adhesive film 10 of the present invention and the manufacturing method thereof will be described.

(Base material layer)
The base material layer 20 is a film-like layer having a front surface 21 and a back surface 22. Of the surface 21 of the base material layer 20, the surface of the label portion 20a has a size capable of printing a design of a POP advertisement.
The substrate layer 20 is preferably, for example, a substrate for printing (single layer) and a substrate (multilayer) on which a receiving layer for receiving ink is formed, and is an elastic substrate having airtightness. Preferably there is.
Examples of the base material layer 20 include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polypropylene, polystyrene, triacetyl cellulose, poly (meth) acrylate, polyvinyl chloride, and the like. Among these, a polyethylene terephthalate film that has been stretched, particularly biaxially stretched, is preferred in that it is excellent in mechanical strength, dimensional stability, glass scattering prevention, and transparency.
The tensile elastic modulus of the base material layer 20 is preferably 0.5 to 6.0 GPa, more preferably 1.0 to 5.0 GPa, and further preferably 1.5 to 4.5 GPa. .
Moreover, what improved the adhesiveness of the base material layer 20 and the self-adhesion layer 30 by giving a corona discharge process to the back surface 22 of the base material layer 20, or providing an easily bonding layer is used suitably. .
The thickness of the base material layer 20 is preferably 25 μm or more, more preferably 50 μm or more from the viewpoint of maintaining the state in which the tab portion 20b is inclined toward the surface 21 side of the base material layer 20 with respect to the label portion 20a. More preferably, the thickness is 100 μm or more, and from the viewpoint of the adhesiveness of the tab portion 20b to the surface 101 of the member to be stuck 100, it is preferably 350 μm or less, more preferably 250 μm or less, and even more preferably 200 μm or less.
As the base material layer 20, for example, a trade name “Lumirror 125EC01” (Toray Industries, Inc.), a trade name “Cosmo Shine 125A4100” (Toyobo Co., Ltd.), and a trade name “Chrisper 125K2323” (Toyobo Co., Ltd.) may be used. it can.

(Self-adhesive layer)
The self-adhesive layer 30 is a layer that is formed on the back surface 22 of the base material layer 20 and is stuck on the front surface 101 of the member to be stuck 100.
The self-adhesive layer 30 is quickly stuck to the adherend by the weight of the film without pressing, and the self-adhesive film is excellent in workability at the time of sticking because of the property.
The self-adhesive film 10 preferably has an adhesive strength of 0.15 N / 25 mm or less after 30 minutes at 23 ° C. by bonding the adhesive layer to the glass surface from the viewpoint of restickability. It is more preferably 06 N / 25 mm or less, and further preferably 0.04 N / 25 mm or less.
The self-adhesive layer 30 is made of polyolefin resin, polystyrene resin such as ethylene-polar monomer copolymer, polyester resin, chlorine resin such as polyvinyl chloride and polyvinylidene chloride, acrylic resin such as polymethyl methacrylate and polyethyl methacrylate, etc. It can be formed from a resin such as a resin based on urethane, a resin based on urethane, or a resin based on silicone, and these resins can be used alone or in combination of two or more.
Moreover, it is preferable that the self-adhesion layer 30 contains a plasticizer as needed.
The thickness of the self-adhesive layer 30 is preferably 5 to 100 μm, more preferably 10 to 75 μm, and still more preferably 15 to 50 μm. By setting the thickness to 5 μm or more, sufficient adhesion to the adherend can be secured, and by setting the thickness to 100 μm or less, it is easy to increase the speed in the solvent drying process of the coating process, and the coated surface is easy to smooth, Sticking out of the glue can be suppressed during slitting.
As the self-adhesive layer 30, for example, a trade name “US-902” (Lion Specialty Chemicals Co., Ltd.) and a trade name “US-1353” (Lion Specialty Chemicals Co., Ltd.) can be used.

(Label part, tab part)
The base material layer 20 has a label portion 20a and a tab portion 20b.
In the back surface 22 of the base material layer 20, the area a2 of the back surface of the tab portion 20b is preferably smaller than the area a1 of the back surface of the label portion 20a, and the area a2 of the back surface of the tab portion 20b is the area of the back surface of the label portion 20a. 20% or less of a1 is preferable, 15% or less is more preferable, and 10% or less is more preferable.

The tab portion 20b extends from the periphery of the label portion 20a by a distance L as shown in FIG. 1 (a), and the base material layer with respect to the label portion 20a as shown in FIG. 1 (b). 20 is inclined toward the surface 21 side. That is, the plate-like base material layer 20 is divided into a portion that becomes the label portion 20a and a portion that becomes the tab portion 20b so that the tab portion 20b is inclined toward the surface 21 side of the base material layer 20 with respect to the label portion 20a. Plastic deformation between them.
For this reason, when the self-adhesive film 10 is stuck on the surface 101 of the member to be pasted 100, a gap s is formed between the tip of the tab portion 20b and the surface 101 of the member to be stuck 100. Here, the gap s can be said to be a parameter representing the degree to which the tab portion 20b is inclined toward the surface 21 side of the base material layer 20 with respect to the label portion 20a. The gap s increases as the distance L increases and the inclination of the tab portion 20b increases.
In a state where the self-adhesive film 10 is stuck on the surface 101 of the member to be pasted 100, the tip of the tab portion 20b is floated by the gap s, so the tip of the tab portion 20b is stuck on the surface 101 of the member to be stuck 100. If it tries to attach, the lifting force will generate | occur | produce in the tab part 20b with the elastic force of the base material layer 20. FIG.
The lifting force is such a force that the tab portion 20b is lifted from the surface 101 of the member to be stuck 100 by a distance s which is a slight distance in a state where the self-adhesive film 10 is stuck on the surface 101 of the member to be stuck 100. Preferably there is.

(Concave)
It is preferable that a streak-like recess 40 is formed between the label portion 20a and the tab portion 20b. The streak-like recess 40 is formed by pressing a streak-like convex part against the surface 21 of the base material layer 20 or between the label portion 20a and the tab portion 20b so that the surface 21 of the base material layer 20 is inside. The base material layer 20 may be folded between the layers.
The ratio of the above-mentioned distance L to the length W of the streak-shaped recess 40 (L / W, sometimes referred to as the aspect ratio K of the tab portion) is preferably 0.5 or more, and 0.6 More preferably, it is 0.7 or more, more preferably 0.8 or more.
Further, from the viewpoint of ensuring ease of peeling, the aspect ratio K is preferably 2.0 or less, more preferably 1.8 or less, and further preferably 1.5 or less.

(Attaching work)
Since the tab part 20b is inclined to the surface 21 side of the base material layer 20 with respect to the label part 20a, when the self-adhesive film 10 is attached to the surface 101 of the adherend member 100, the tab part 20b An attempt is made to float from the surface 101 of the member 100. On the other hand, the self-adhesive layer 30 is formed of a low-tack pressure-sensitive adhesive that exhibits an adhesive strength comparable to that of the force to lift.
For this reason, the lifting force acts so as to counteract the adhesive force of the self-adhesive layer 30 in the tab portion 20b, and the magnitude of the lift force and the adhesive force of the self-adhesive layer 30 are approximately the same. The adhesive force acting on the tab portion 20b, which is the resultant force of the lifting force and the adhesive force of the self-adhesive layer 30, is not applied (the lift force is greater than the adhesive force of the self-adhesive layer 30), or , A small state (a state in which the lifting force is slightly smaller than the adhesive force of the self-adhesive layer 30). That is, the adhesive force between the label portion 20 a and the surface 101 of the member to be pasted 100 (the resultant force of the adhesive force and the lifting force) is smaller than the adhesive force between the tab portion 20 b and the surface 101 of the member to be pasted 100. . For this reason, the tab portion 20b is in a state of floating from the surface 101 of the member to be pasted 100, and even if the tab portion 20b is stuck to the surface 101 of the member to be pasted 100, the operator covers the tab portion 20b. In this state, it can be easily peeled off from the surface 101 of the sticking member 100, and the operator can easily pick the tab portion 20b. For this reason, since the self-adhesive film 10 can be peeled off from the surface 101 of the to-be-bonded member 100, the self-adhesive film 10 has ease of peeling and restickability, while having a sticking state maintenance property.

  Moreover, the self-adhesive film 10 is formed so that the air between the surface 101 of the member to be bonded 100 and the self-adhesive layer 30 generated when the self-adhesive film 10 is applied to the surface 101 of the member to be bonded 100 is pushed out. Since it sticks to the surface 101 of the to-be-adhered member 100, among the self-adhesive films 10, the label part 20a adsorb | sucks to the surface 101 of the to-be-adhered member 100 through the self-adhesive layer 30, and the label part 20a and to-be-adhered member A state close to a vacuum is formed between the surface 101 and the surface 101, and the adsorption force is exerted over the entire label portion 20 a of the self-adhesive film 10. However, the tab portion 20b is close to a vacuum between the tab portion 20b and the surface 101 of the member 100, but the area a2 of the back surface of the tab portion 20b is smaller than the area a1 of the back surface of the label portion 20a. The suction force of the tab portion 20b is very small compared to the suction force of the label portion 20a and can be ignored. In other words, the tab portion 20b hardly exerts an attracting force, so the attracting force of the tab portion 20b has little influence on the tab portion 20b composite force. For this reason, in the label part 20a, the operator can easily pick the tab part 20b while sufficiently maintaining the sticking state maintaining property by the adsorption force, and the self-adhesive film 10 is attached to the surface 101 of the member to be stuck 100. Therefore, the self-adhesive film 10 has ease of peeling and re-sticking property while maintaining sticking state.

(Peeling work)
Since the self-adhesive film 10 is pasted on the surface 101 of the member to be pasted 100 so that the tab portion 20b is inclined toward the surface 21 side of the base material layer 20 with respect to the label portion 20a, the tab portion 20b The self-adhesive layer 30 formed on the back surface receives a lifting force such that the self-adhesive layer 30 is peeled off from the surface 101 of the member to be stuck 100.

  For this reason, as above-mentioned, since the adhesive force between the tab part 20b and the to-be-bonded member 100 is offset by the lifting force, it is smaller than the adhesive force between the label part 20a and the to-be-bonded member 100. The tab portion 20b is easily peeled off from the surface 101 of the member to be pasted 100.

  Further, the tab portion 20b is in a state of floating from the surface 101 of the member to be pasted 100, and even if the tab portion 20b is stuck to the surface 101 of the member to be pasted 100, the operator sticks the tab portion 20b to the subject. In this state, it can be easily peeled off from the surface 101 of the member 100, and the operator can easily pick the tab portion 20b.

  Therefore, when the operator pulls the tab portion 20b that has been peeled off, the label portion 20a is gradually peeled off from the vicinity of the recess 40.

  At this time, as described above, the entire surface of the label portion 20a is adhered so that the air between the label portion 20a and the surface 101 of the adherend member 100 is extruded to exert an adsorbing force that strongly adheres. Although it is affixed on the surface 101 of the member 100, when the vicinity of the recessed part 40 of the label part 20a is peeled off from the surface 101 of the to-be-bonded member 100, air enters between the surface 101 of the to-be-bonded member 100, and adsorption | suction Power is almost lost. Thereby, the label part 20a and the surface 101 of the to-be-bonded member 100 will be in the state stuck by the adhesive force of the self-adhesion layer 30. FIG. However, since the self-adhesive layer 30 has a low tack property, the operator can easily remove it without damaging the self-adhesive film 10.

The manufacturing method of the self-adhesive film 10 according to the present invention includes a step of plastically deforming the base material layer 20 so that the tab portion 20b is inclined toward the surface 21 side of the base material layer 20 with respect to the label portion 20a.
As a method of plastically deforming the base material layer 20, a method of plastically deforming the base material layer 20 by pressing the streaky convex portions against the surface 21 of the base material layer 20 to form the streaky concave portions 40, and A method of plastically deforming the base material layer 20 by bending the base material layer 20 between the label portion 20a and the tab portion 20b so that the surface 21 of the base material layer 20 is on the inner side can be mentioned.

Specifically, the self-adhesive film 10 can be manufactured as follows.
As shown in FIG. 2, a release film 50 formed of an elastic material such as a polyester film and a seal layer 10 ′ formed of a self-adhesive layer 30 ′ and a base material layer 20 ′ are laminated and sealed. The material 60 is formed (seal material forming step).
The release film 50 is preferably a separator film that has been subjected to a release treatment. However, an untreated film may also be used depending on the self-adhesive layer used.
As the release film 50, for example, trade name “Therapy 50BX8A” (Toray Film Processing Co., Ltd.) and trade name “SK-4” (Otsuchi Industry Co., Ltd.) can be used.
Examples of the sealing material 60 include Gelpoly (registered trademark) (manufactured by Panac Corporation, product name “Gelpolyclear 125UV-IJ” (product number “GPH125B23J11”, product name “Gelpolyclear 50UV-IJ” (product number “GPH50B23J11”)), The product name “Gel Poly White 125UV-IJ” (product number “GPH125FJ”)) can be used.

Next, printing for a plurality of POP advertisements is performed on the surface of the sealing material 60, that is, the surface of the base material layer 20 (printing process). A portion of the base material layer 20 on which the POP advertisement is printed becomes a label portion 20a of the base material layer 20 in a later step.
As shown in FIG. 2 (a), a press cutter 200 is disposed above the surface of the sealing material 60 and pressed as shown in FIG. 2 (b).
As shown in FIG. 2B, the press cutter 200 includes a die-cutting cutter 202 formed on the cutter base 201 and a line pushing portion 204. The cutting edge of the die cutter 202 has the same predetermined shape as that of the base material layer 20.
By strongly pressing the press cutter 200 disposed on the surface of the sealing material 60, the cutting edge of the die cutting cutter 202 advances toward the surface 51 of the release film 50, and the base material layer 20 and the self-adhesive layer 30 are cut. Then, the process proceeds to a position where the surface 51 of the release film 50 is recessed.
At this time, it is preferable that the distance d from the cutter base 201 to the cutting edge of the die cutting cutter 202 is substantially the same as the distance e from the cutter base 201 to the tip of the muscle pushing portion 204. Since the distance d and the distance e are substantially the same, the die-cutting cutter 202 cuts out the self-adhesive film 10 and at the same time, the muscle pushing portion 204 strongly presses the self-adhesive film 10. As a result, the self-adhesive film 10 is cut out from the seal layer 10 ′, and the base material layer 20 and the self-adhesive layer 30 that are pressed by the muscle pressing portion 204 of the base material layer 20 are plastically deformed. A recess 40 is formed in the layer 20. When the recess 40 between the label portion 20a and the tab portion 20b is plastically deformed, the tab portion 20b is inclined toward the surface 21 side of the base material layer 20 with respect to the label portion 20a.

Thus, according to the self-adhesive film 10 according to the present invention, the tab portion 20b is inclined toward the surface 21 side of the base material layer 20 with respect to the label portion 20a, and thus has a sticking state maintaining property. , Easy to peel and re-stickability.
In addition, according to the self-adhesive film 10 according to the present invention, the boundary between the label portion 20a and the tab portion 20b is formed by the streak-shaped concave portion 40 having no cut, so that the strength is maintained and the tab portion 20b is formed. Even if the operator pulls, the label portion 20a and the tab portion 20b are not separated.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to the following examples. In addition, the following evaluation was performed about the self-adhesive film obtained by the following Examples and Comparative Examples.

[Evaluation method]
The self-adhesive film was evaluated as follows.

<Attachment state maintainability evaluation method>
The self-adhesive film was bonded to the surface of a smooth glass plate by its own weight, and the state of application was evaluated.
A: A state where the self-adhesive film is adhered to the surface of the adherend member B: A state where the self-adhesive film is partially peeled from the surface of the adherend member C: The self-adhesive film is completely peeled off from the surface of the adherend member State

<Evaluation method of peelability>
In the sticking state of the sticking state maintainability evaluation method, the ease of peeling the self-adhesive film from the surface of the member to be stuck was evaluated with the index finger. The measurement was performed 10 times by 5 people and evaluated.
A: Easy to peel B: Neither can be said C: Hard to peel

<Verification method of re-stickability>
The self-adhesive film peeled off from the sticking state of the sticking state maintainability evaluation method was subjected to the sticking process again to evaluate the sticking state immediately after re-sticking. The evaluation was the same as that of the evaluation method of the pasting state maintainability.

[Evaluation materials]
The following materials were used as evaluation materials.

<Seal material>
Seal material 1: manufactured by Panac Corporation, Gelpoly (registered trademark), “Gelpolyclear 125UV-IJ” (product number “GPH125B23J11”, self-adhesive layer: 0.03 N / 25 mm, tensile modulus of base film: 4 GPa.

<Press cutter>
The press cutter 1 has a cutting edge having a shape in which an elliptical label portion and a rectangular tab portion extending from the periphery of the label portion are integrated, and a muscle pressing portion is provided inside the cutting edge. The distance e in FIG. 2 is substantially the same as the distance d.
The press cutter 2 is the same as the press cutter 1 except that there is no muscle pushing portion.

[Example 1]
<Self-adhesive film>
The sealing material 1 was pressed with a press cutter 1 to obtain a self-adhesive film. The depth of the stripe-shaped recessed part was measured between the label part and tab part of the obtained self-adhesive film. Moreover, the obtained self-adhesive film was affixed on the surface of the to-be-bonded member, and the gap s between the front-end | tip of the tab part and the surface of a to-be-bonded member and the aspect ratio K of the tab part were measured.
The sticking state maintainability, ease of peeling, and re-sticking were evaluated. The measurement and evaluation results are shown in Table 1.

[Examples 2 to 3, Comparative Example 1]
In Examples 2-3 and Comparative Example 1, a self-adhesive film was obtained in the same manner as in Example 1 except that the sealing material 1 and the press cutter 1 were replaced with those shown in Table 1. The obtained self-adhesive film was measured and evaluated in the same manner as in Example 1. The measurement and evaluation results are shown in Table 1.

[Evaluation]

  As is apparent from the results in Table 1, in Examples 1 to 3 having the gap s, the tab portion 20b is inclined to the surface 21 side of the base material layer 20 with respect to the label portion 20a, and the pasting state maintainability, Both ease of peeling and restickability are good. On the other hand, Comparative Example 1 having no gap s had good sticking state maintenance, but was not easy to peel. In Comparative Example 1, since the ease of peeling was not good, the edge of the self-adhesive film was disturbed or torn during peeling, so the state of being partially peeled off immediately after re-sticking Thus, the re-stickability was not good.

DESCRIPTION OF SYMBOLS 10 Self-adhesive film 10 'Seal layer 20 Base material layer 20a Label part 20b Tab part 21 Base material surface 22 Back surface of base material layer 30 Self-adhesive layer 40 Recess 50 Release film 51 Release film surface 60 Sealant 100 To-be-bonded member 101 Surface of to-be-bonded member 200 Press cutter 201 Cutter base 202 Cutter 204 Bracing part

Claims (5)

It is a self-adhesive film that is applied to the surface of a member to be applied,
A film-like base material layer having a front surface and a back surface;
A self-adhesive layer formed on the back surface of the base material layer and attached to the surface of the member to be pasted,
The base material layer has a label portion and a tab portion extending from the periphery of the label portion, and is plastically deformed between the label portion and the tab portion, and the tab portion is formed on the label portion. On the other hand, it is inclined to the surface side of the base material layer ,
The tab portion is a self -adhesive film in which the self-adhesive layer is exposed .   The self-adhesive film according to claim 1, wherein an area of the back surface of the tab portion is smaller than an area of the back surface of the label portion on the back surface of the base material layer.   The self-adhesive film according to claim 1 or 2, wherein a streak-like recess is formed between the label portion and the tab portion on the surface of the base material layer.   The ratio (L / W) of the distance (L) from the periphery of the label portion to the tip of the tab portion and the length (W) of the streak-shaped recess is 0.5 to 2.0. Item 4. The self-adhesive film according to Item 3. A method for producing a self-adhesive film according to any one of claims 1 to 4,
A method for producing a self-adhesive film, comprising a step of plastically deforming the base material layer so that the tab portion is inclined toward the surface side of the base material layer with respect to the label portion.