JP3485145B2 - Easy peeling adhesive tape - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easily peelable pressure-sensitive adhesive tape which has high strength in the lengthwise direction, is easily peeled off, and can be manually torn in the transverse direction if necessary.

[0002]

BACKGROUND OF THE INVENTION Adhesive tapes are used for binding various articles,
It is used for temporary sealing of sealed items, packaged items, and various stationery items. In general, adhesive tape is wound around a paper tube with the adhesive side facing inward,
It is used by unwinding and cutting a certain length when necessary. Even if the adhesive tape is merely temporarily fixed, the adhesive tape is required to have a certain strength so that tension is applied to the adhesive tape when it is unwound and the tape is not torn. Furthermore, when used for bundling various articles, the purpose of bundling cannot be achieved unless there is strong strength in the length direction both during bundling and after bundling.

When the adhesive tape which is bound or packed is peeled off, the end portion is found and peeled off with a nail, and the portion is pinched and pulled off or cut directly with a blade. In order to facilitate the peeling, a tape provided with a non-adhesive portion not provided with an adhesive along at least one edge line of the adhesive tape has also been proposed. When peeling off the adhesive tape, since there is a floating portion at the end without sticking, the adhesive tape can be easily peeled off by putting a finger on this portion and pulling.

Recently, the adhesive tape is also required to have a high strength, and a plastic material is used as a base material for binding foods containing water, etc., and the strength is so great that it cannot be broken by fingers. In order to improve the tearability of the adhesive tape,
An attempt was made to provide a fine scratch group on the inner side of the edge line of the tape end, but the size of the scratch and the strength of the adhesive tape base material, the distance from the edge line to the scratch group, etc. were complicatedly affected,
The conditions for imparting reliable transverse tearability without impairing the strength in the length direction were strict, and it was difficult to control in actual practice.

[0005]

In the field of bundling packaging of foods and the like, an adhesive tape using a high-strength base film made of plastic, which has a large strength in the longitudinal direction and can withstand bundling and is peeled off. In this case, there has been a demand for an easily peelable pressure-sensitive adhesive tape that can easily start peeling from an arbitrary site and can be torn in a transverse direction with a finger at an arbitrary site.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and the constitution thereof is such that at least one non-adhesive portion not provided with an adhesive is present along one edge line, It is characterized in that a group of fine scratches are continuously provided linearly in the central part of the non-adhesive portion, and the scratches are scratches obtained by pressing a hard material having irregular corners.

The present inventor has found that in a tape having a non-adhesive portion having a constant width, that is, a portion not applied with an adhesive, in the portion along the edge line of the adhesive tape, the tension when the tape is pulled is the adhesive. It was found that the applied force is strong only on the applied part and almost no tension is applied to the non-adhesive part. Based on this fact, we have succeeded in providing an easily peelable adhesive tape in which fine scratches are linearly provided inside the edge line of the non-adhesive portion.
Although this adhesive tape has scars that tend to reduce the strength in the lengthwise direction as well, the tension is hardly applied to these scars during use, so the decrease in strength in the lengthwise direction is ignored. can do. Moreover, when it is desired to tear the adhesive tape in the transverse direction, it can be torn from any portion in the transverse direction by twisting by applying force to the fingertip.

As shown in FIG. 1, the adhesive tape 1 of the present invention
Is firmly adhered to the flat plate, and one end is peeled off and pulled in the direction of the arrow, the tensile stress is strongly applied to the central portion, and the adhesive portion 2 becomes a chevron. That is, even if the stress concentration occurs at the highest part of the ridge and the scratch groups 3 are formed at both ends, the scratch groups 3 do not contribute to the reduction in tensile strength. 4 is a non-adhesive part, and 5 is an adhesive application part. Further, in the adhesive tape 1 provided with the non-adhesive portion 4 only on one side, as shown in FIG. 2, when the adhesive tape is adhered onto a flat plate and one end is peeled off and pulled, as shown in FIG. Stress is concentrated near the edge line 6 on the side of the adhesive-applied part 5 that is far away, and the area near the boundary between the non-adhesive part 4 and the adhesive-applied part 5 is rapidly separated, and stress is almost applied to the non-adhesive part 4. Therefore, the scratch group 3 does not contribute to the decrease in tensile strength.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The base material used in the pressure-sensitive adhesive tape of the present invention is not required for a material that is originally torn by hand, such as cellophane or paper. When asparagus, bananas, spinach, turnips, vegetables and fruits such as leeks, or two or more sausages are bound, since these foods generally contain moisture,
A moisture resistant plastic material is preferred. Examples thereof include stretched or unstretched polypropylene, polyester, stretched or unstretched nylon, and soft vinyl chloride. Depending on the application, it is possible to use a base material obtained by laminating these materials with other materials such as paper and an aluminum vapor deposition layer.

The adhesive tape 1 of the present invention has a non-adhesive portion 4 which is not provided with an adhesive agent on both edge portions or one edge portion. In order to obtain a sufficient adhesive strength, the width of the adhesive coating portion 5 is 6 mm or more, preferably 8 mm or more. The width of the non-adhesive portion 4 varies depending on the width of the entire tape, but is 3 to 5 mm if the entire width is about 2 cm. If it is less than 3 mm, the area where you can put your fingers in is small because it is pinched and peeled off with your fingers.
If it exceeds mm, the width of the adhesive coating portion 5 becomes insufficient.

The scar group consists of minute scars that cannot be discerned by the naked eye. If you use a processing tool that is provided with dense cutting edges that have fine directional properties, each scratch will be directional and easily break in that direction.Therefore, irregular abrasive grains with many corners are present on the surface. A processing tool is preferred. That is,
If it is a scratch obtained by pressing a hard material having irregular corners, it is unlikely to break unintentionally. It can be easily processed by applying and fixing abrasive grains such as diamond or alundum on the outer peripheral surface of the rotating disk and rotating the disk while pressing the non-adhesive portion 4.

The grain size of the abrasive grains differs depending on the type and thickness of the base film, the width of the tape, the width of the non-adhesive portion, and the like. For example, if the base material is a stretched polypropylene having a thickness of 40 μm, JI
It is possible to use diamond abrasive grains having an S standard of 80 to 140 mesh. For example, when the base material is soft vinyl chloride having a thickness of 40 μm, the influence on the strength of the scratches is about twice that of the stretched polypropylene, and thus finer scratches are preferable.

The portion where the scratches are processed is inside the edge line 6 of the non-adhesive portion 4. When the scratch group is present on the edge line 6, the strength of the adhesive tape 1 in the length direction is lowered and the adhesive tape 1 is easily broken.
It should not be in the adhesive application section. In this case, the strength of the adhesive tape in the length direction is extremely reduced. The most preferable part is the central part between the non-adhesive part 4 and the adhesive-applied part 5, but the non-adhesive part 4 may be shaken during processing and thus shaken.
It is a portion at least 1 mm inside from the inner edge line 6.

The adhesive tape of the present invention may be manufactured by any method. For example, an adhesive is applied in a striped pattern on a raw material of a base film to form an adhesive application part 5 and a non-adhesive part 4, and two rows of abrasive grains are provided with an interval of about 1/2 of the non-adhesive part. The roll provided with the fixing portion is rotated to the center of the non-adhesive portion to process the scratch group 3. The central portion of the non-adhesive portion may be cut when it is wound around the paper tube, or the central portion of the non-adhesive portion may be cut into loops together with the paper tube after being wound around the paper tube as it is. Although the method of cutting the entire paper tube is an efficient method, it is necessary that the non-adhesive portion is wound on the non-adhesive portion as accurately as possible without being displaced.

Further, the non-adhesive part can be colored so that the consumer can confirm the existence of the non-adhesive part, or the adhesive-applied part 5 and the non-adhesive part 4 can have different color tones. In addition, a direct or indirect indication that the scars are processed and can be cut with a finger from any part, such as "cut from anywhere", "cut", "CU"
It is preferable that the adhesive tape be continuously provided with an indication such as "T" or a pictogram indirectly indicating that it is cut. In some cases, the non-adhesive portion 4 may be formed by applying a substance such as a powder of a silicone resin or a thin non-adhesive film on the surface of the non-adhesive portion after the adhesive is applied so as to eliminate the adhesiveness.

[0016]

Example A pressure-sensitive adhesive was applied in the form of vertical stripes having a width of 10 mm and an interval of 10 mm to a raw material of a uniaxially stretched polypropylene film having a thickness of 40 μm. At the same time, using a processing roll in which the diamond abrasive grains of 110 to 120 mesh according to JIS standard are fixed in two rows on the circumferential surface while keeping a distance of 5 mm,
The scratch group 3 was processed in the center of the non-adhesive part 4. While the pressure-sensitive adhesive was being dried, this original fabric was wound around the paper tube 7 accurately while preventing displacement. The central part of the non-adhesive surface of this wound product was cut while being wound with a rotary blade to produce an easily peelable adhesive tape 1 wound as shown in FIG.

This adhesive tape is set on the unwinder,
It did not cut even when it was suddenly unwound. Using the adhesive tape of this example set in the unwinder, Asparagus 6-7
The books were bound at the root and the tip so that each bundle weighed about 500 g. A large amount of asparagus was bundled by continuous bundling work, then packed in a cardboard box and transported, and then sold on the market, but during that time, there was no trouble of cutting the adhesive tape. When using the asparagus, the adhesive tape was easily cut by twisting the edge line 6 with both fingers while putting the fingers into the non-adhesive part 4 and peeling them off, and individual asparagus could be taken out.

On the other hand, as a comparative example, an adhesive tape having the same width was prepared by using the same material as that of the example except that an adhesive was applied to the entire surface, and the same scratch group 3 was provided at the same site as the example. It was Using this tape, asparagus was bundled in the same manner as in Example 1, but the adhesive tape was cut during the tape unwinding, and the work could not be performed smoothly. The asparagus bundled with this adhesive tape was sometimes cut when the shock was applied during the distribution process.

[0019]

According to the present invention, it is possible to obtain an easily peelable pressure-sensitive adhesive tape which has high strength in the length direction, is easily peeled off, and can be manually torn in the transverse direction as required. Therefore, the consumer can cut the tape from any part of the adhesive tape, and if a trouble occurs in the production process, the consumer can immediately cut the trouble with a finger and deal with the trouble. It has the advantage of not increasing the processing cost.

[Brief description of drawings]

FIG. 1 is a plan view of the pressure-sensitive adhesive tape of the present invention attached on a flat plate,
It is a perspective view which shows the peeling condition when peeling from one side.

FIG. 2 is a plan view showing the pressure-sensitive adhesive tape of the present invention attached on a flat plate,
It is a perspective view which shows the peeling condition when peeling from one side.

FIG. 3 is a perspective view of the adhesive tape of the present invention.

[Explanation of symbols]

1 Adhesive tape 2 Adhesive site 3 scar groups 4 Non-adhesive part 5 Adhesive coating section 6 edge line 7 paper tubes

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Shown 52-4453 (JP, U) Shown 48-77474 (JP, U) Shown 48-88356 (JP, U) Shown 49- 19061 (JP, U) Actual development Sho 55-146559 (JP, U) Actual public Sho 47-39499 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) C09J 7/00-7 / 04 B65D 63/00-63/18

Claims (2)

(57) [Claims] 1. A non-adhesive portion to which no adhesive is applied is present along at least one edge line, and the center of the non-adhesive portion is present.
An easily peelable pressure-sensitive adhesive tape, characterized in that a group of fine scratches is continuously provided in a linear shape on the portion. 2. A scar is characterized in that it is scar obtained by pressing a hard material having a corner atypical claim 1 Symbol
Easily peelable adhesive tape.