JP4815465B2 - Self-adhesive foam cushioning sheet - Google Patents

Description

  The present invention relates to a cellular cushioning sheet having self-adhesiveness (hereinafter referred to as “self-adhesive cellular cushioning sheet”).

  Conventionally, for example, foam cushion sheets (air cellular cushion sheets) have been used as packaging materials for articles that are brittle to impact (hereinafter referred to as “protected objects”), thermal insulation materials for building civil engineering, and protective curing materials. . This cellular cushion sheet is usually a cap formed by forming a large number of closed cells (air cellular) between a base film (hereinafter referred to as “base film”) and heat-sealing with each other. A film (buffer material sheet) is produced as a basic structure.

  In recent years, a self-adhesive cellular cushion sheet in which an adhesive is disposed on the base film side has also been proposed. As the cellular cushion sheet provided with such an adhesive, for example, on one side of a polyolefin film as a base film, an adhesive layer having an adhesive strength of 0.7 to 25 (N / 50 mm), Some have a cap film made of a thermoplastic resin on the other surface. (For example, refer to Patent Document 1).

  In addition, the base film and one of the cap films made of polyolefin are bonded together, or two cap films are bonded together with closed cells as the outside, and manufactured using a single site catalyst as polyolefin. There is a self-adhesive cellular cushion sheet with chain branching. (For example, refer to Patent Document 2).

  In addition, a flat top on the closed cell side of the cap film, part or all selected from the surface not bonded to the cap sheet of the base film, or the face of the closed cell of the cap film bonded to the base film A film is bonded, and a part or all selected from the surface of the top film and the surface of the base film has a roughening layer by a roughening treatment agent, and part or all of this roughening layer There is a self-adhesive cellular cushion sheet having an adhesive layer. (For example, refer to Patent Document 3).

  Furthermore, there is a self-adhesive cellular cushion sheet in which an unvulcanized rubber adhesive is applied to the surface of the cap film and dried. (For example, refer to Patent Document 4).

Further, there is a self-adhesive sheet made of a resin plastic material in which 10 to 100 parts by weight of an olefin polymer is blended with 100 parts by weight of a hydrogenated diene random copolymer. (For example, refer to Patent Document 5).
JP-A-9-207260 JP-A-9-323753 JP 2000-318070 A JP 2002-12268 A Japanese Patent No. 3106227

  The above-described conventional foam cushion sheet, self-adhesive foam cushion sheet, or self-adhesive sheet is usually manufactured in a long form and provided in a roll-shaped product form wound around the core. The Therefore, in use, it was torn in the width direction (substantially perpendicular to the winding direction) by the required dimensions. Here, conventional foam cushion sheets and self-adhesive foam cushion sheets can be torn relatively straight in the longitudinal direction (winding direction), but if you try to tear in the width direction, either left or right There is a strong tendency to bend and cut in the longitudinal direction. For this reason, it is necessary to cut to a desired dimension using a cutting tool such as a cutter or a scissors, which is inconvenient. Moreover, when using a cutting tool such as a cutter or a grudge, there is a drawback that it is difficult to cut by sticking to the cutting tool.

  Therefore, in order to improve the tearability in the width direction, an attempt was made to make substantially V-shaped notches on both sides of the foam cushioning sheet. However, the side edges of the sheet are somewhat easy to tear. However, when tearing in a little, it was difficult to tear straight because it shifted to the left or right.

In addition, attempts have been made to improve the tearability in the width direction of the cellular cushion sheet by adding calcium carbonate or a filler to the resin material for molding the cellular cushion sheet, but the mechanical strength decreases. Also, as the cut was stretched, the cut became very unsightly due to the brittle state.

  Therefore, a cellular cushion sheet in which small fissures (perforations) are arranged in the width direction in the base film and tear lines are provided at regular intervals is also introduced. However, this foam cushion sheet has a drawback that it cannot be torn at a desired position because the tearing position is determined. Further, when the size in the longitudinal direction is increased, a number of tear lines are inserted. In such a case, the tear line may adversely affect the bubble property, water tightness, or mechanical strength.

  An object of the present invention is to improve such a conventional self-adhesive cellular cushion sheet, and it can be easily torn almost straight in the width direction by manual tearing from any side edge portion. An object is to provide a self-adhesive cellular cushioning sheet.

In order to achieve this object, in the present invention, an adhesive layer is disposed on at least a part of one side of a foam cushioning sheet formed by laminating a cap film having a large number of closed cells on one side of a base film. a self-adhesive foaming buffer sheet comprising Te, the base film is, Ri Na is composed of a thermoplastic film that can be torn transverse to the width direction from an arbitrary side edge portion, said thermoplastic film by inflation molding The present invention provides a self-adhesive cellular cushion sheet formed by molding .

In addition, the present invention provides a self-adhesive in which an adhesive layer is disposed on at least a part of one side of a foam cushioning sheet obtained by bonding a cap film having a large number of closed cells to one side of a base film. a sexual foaming buffer sheet, said base film, Ri Na and thermoplastic films that can tear the lateral width direction from an arbitrary side edge portion are laminated, said thermoplastic film, formed by molding by inflation molding A self-adhesive cellular cushion sheet is provided.

Furthermore, the present invention provides a self-adhesive in which a pressure-sensitive adhesive layer is disposed on at least a part of one side of a foam cushioning sheet obtained by laminating a cap film having a large number of closed cells on one side of a base film. a sexual foaming buffer sheet, the cap film, Ri Na and thermoplastic films that can tear the lateral width direction from an arbitrary side edge portion are laminated, said thermoplastic film, formed by molding by inflation molding A self-adhesive cellular cushion sheet is provided.

  These self-adhesive cellular shock-absorbing sheets can be easily torn almost straight in the width direction by manual tearing from any side edge portion.

In the case of a self-adhesive cellular cushion sheet in which a thermoplastic film that can be laterally split from an arbitrary side edge portion is disposed between the cellular cushion sheet and the adhesive layer, the base A film can also be comprised from the thermoplastic film which can be laterally split from an arbitrary side edge location in the width direction.

Further, in the case of a self-adhesive cellular cushion sheet in which a thermoplastic film that can be laterally split from an arbitrary side edge portion is disposed between the cellular cushion sheet and the adhesive layer, The base film can be laminated with a thermoplastic film that can be laterally split from an arbitrary side edge portion .

The thermoplastic film can also be molded from a high-density polyethylene film molded at a blow ratio of 4 or more.

The thermoplastic film can also be molded from a low density polyethylene film molded at a blow ratio of 3 or less.

  The self-adhesive foam cushioning sheet according to the present invention can be easily torn almost straightly in the width direction by manual tearing from an arbitrary side edge without using a cutting tool such as a cutter or a scissors. In addition, since there are no tear holes due to the tear line, it can be used in a variety of ways without impairing the bubble property, water tightness, mechanical strength, or the like.

  Next, a self-adhesive cellular cushion sheet according to a preferred embodiment of the present invention will be described with reference to the drawings.

  In addition, embodiment described below is the illustration for demonstrating this invention, and this invention is not limited only to these embodiment. Therefore, the present invention can be implemented in various forms without departing from the gist thereof.

  1 is a perspective view showing a self-adhesive foam cushioning sheet according to Example 1 of the present invention, FIG. 2 is a sectional view of the self-adhesive foam cushioning sheet shown in FIG. 1, and FIG. FIG. 4 is a perspective view showing a state in which the self-adhesive cellular cushion sheet shown is laterally split from an arbitrary side edge portion by hand tearing, and FIG. 4 is a manufacturing process of the self-adhesive cellular cushion sheet shown in FIG. It is a schematic diagram which shows a part of.

  As shown in FIGS. 1 to 3, a self-adhesive foam cushioning sheet 1 according to Example 1 is provided with a base film 11 and a cap film provided on one side of the base film 11 and having a large number of closed cells 12. 13 and an adhesive layer 14 disposed on the side of the cap film 13 where the closed cells 12 are formed (the surface opposite to the surface on which the base film 11 is disposed). ing.

The base film 11 is composed of a low density polyethylene film (density: about 0.92 g / cm ³ , thickness: about 10 μm) molded at a stretch ratio of blow ratio 2. That is, the base film 11 is a thermoplastic film and can be laterally split in the width direction.

  The cap film 13 is composed of a low density polyethylene film (thickness: about 20 μm). The plurality of closed cells 12 formed in the cap film 13 were obtained, for example, by creating a cap-shaped unevenness by drawing a film that is fed in a molten state by a heating roll with a vacuum suction roll. Such a manufacturing method is conventionally known. The cap film 13 was manufactured such that the closed cells 12 had a diameter of about 10 mm and a height of about 4 mm.

  The pressure-sensitive adhesive layer 14 is mainly composed of a pressure-sensitive adhesive, and this pressure-sensitive adhesive is not particularly limited as long as it is usually used. For example, natural rubber-based pressure-sensitive adhesive, synthetic rubber-based pressure-sensitive adhesive, acrylic An adhesive etc. are mentioned. In particular, a hydrogenated styrene / butadiene copolymer is suitable from the viewpoint of film forming, adhesiveness of a cellular buffer sheet, unwinding, and the like.

  As the hydrogenated styrene / butadiene copolymer that is a raw material of the pressure-sensitive adhesive layer 14, a thermoplastic elastomer resin obtained by hydrogenating a styrene / butadiene block copolymer or a styrene / butadiene random copolymer is used. However, those based on block copolymers are more suitable because they have more appropriate tackiness. The bonded styrene content and hydrogenation rate of the hydrogenated styrene / butadiene copolymer can be appropriately changed depending on the purpose of use, but the adhesiveness between the adhesive layers 14 and the ease of unwinding the cellular buffer sheet Thus, the bound styrene content of the hydrogenated styrene-butadiene copolymer resin is preferably 5 to 25% by weight, more preferably 10 to 20% by weight, and the hydrogenation rate is 80% or more from the viewpoint of film moldability. Is preferable, and more preferably 90% or more.

  The pressure-sensitive adhesive layer 14 has, for example, an adhesive strength of 0.1 to 10 N (Newton) / 40 mm, preferably 0.3 to 0.8 N / 40 mm, more preferably 0.5 to 6 N / 40 mm. . This adhesive strength is measured by the following method. First, the pressure-sensitive adhesive layers 14 were bonded to each other, and a 2 kg rubber roller was reciprocated once from the top of the 40 mm width of the sample, and then 0. The resistance value at the time of peeling (peeling angle 180 °) at a speed of 3 (m / min) was determined, and this was taken as the adhesive strength.

  Here, the self-adhesive cellular cushion sheet 1 adheres the adhesive layers 14 together when, for example, an object to be protected is packaged, and maintains this state. However, the adhesive strength of the adhesive layer 14 is When it is 0.1 N / 40 mm or less, the pressure-sensitive adhesive layers 14 tend to be peeled off, and it is difficult to maintain the wrapped state.

  Moreover, when the adhesive strength of the pressure-sensitive adhesive layer 14 is 10 N / 40 mm or more, the pressure-sensitive adhesive layers 14 are difficult to peel off, and it is difficult to release (reuse) the packaging. In addition, for example, when the self-adhesive foam cushion sheet 1 is unwound from the self-adhesive foam cushion sheet 1 wound in a roll with an arbitrary length, the pressure-sensitive adhesive layer 14 is hardly peeled off from the base film 11. It tends to be difficult to perform smooth unwinding. However, once deliberately increasing the adhesive strength and wrapping, it is possible to make it unopenable and prevent unauthorized opening unless the self-adhesive cellular cushion sheet is broken.

  As shown in FIG. 4, the pressure-sensitive adhesive layer 14 is formed by pressure-bonding the pressure-sensitive adhesive film 14 </ b> A supplied from the T-die 100 to the side where the closed cells 12 of the cap film 13 are formed by the seal roll 101. It is arranged by. At this time, the cap film 13 may be disposed on the base film 11. Moreover, the adhesive layer 14 can also use the film previously shape | molded by the inflation method or the T-die method. That is, the T die 100 shown in FIG. 4 can be replaced with a roll-shaped adhesive film.

  Further, desired additives such as an antistatic agent, an ultraviolet absorber, a weather resistance imparting agent, a flame retardant, and the like may be added to the base film 11, the cap film 13, and the pressure-sensitive adhesive layer 14.

  For example, when “Dynalon 4600P (trade name): manufactured by JSR” was used as the pressure-sensitive adhesive layer 14 according to the present invention, an adhesive strength of 2.2 N / 40 mm was obtained. Further, when a mixture of “Dynalon 4600P (trade name): made by JSR” and low density polyethylene in a ratio of 8: 2 was used, an adhesive force of 2.0 N / 40 mm was obtained. Furthermore, when “Dynalon 1320P (trade name): manufactured by JSR” was used, an adhesive strength of 3.1 N / 40 mm was obtained.

  On the other hand, it was found that when a mixture of “Dynalon 4600P (trade name): manufactured by JSR” and low density polyethylene in a ratio of 6: 4 was used, the adhesive strength was low and it was not practical.

Next, for comparison, a self-adhesive foam cushioning sheet was used under the same conditions as in Example 1 except that a low-density polyethylene film (thickness: about 15 μm) formed by the T-die method was used as the base film. (Comparative product) was manufactured.

  Subsequently, when the self-adhesive cellular cushion sheet 1 obtained in Example 1 and the comparative product were compared in lateral tearing performance, the following results were obtained.

Self-adhesive cellular cushion sheet obtained in Example 1:
When it is torn in the width direction (arrow X direction: see FIG. 3) according to JIS K 7128-2 Elmendorf tearing method, it is about 3.1 degrees away from the longitudinal direction (arrow Y direction: see FIG. 3). I was able to tear it almost straight. Further, when the paper was torn in the width direction, it was possible to tear it sideways to a satisfactory degree with a deviation of about ± 2 mm.

Comparison product:
When tearing in the width direction (arrow X direction: see FIG. 3) according to the JIS K 7128-2 Elmendorf tearing method, it deviated by about 45.8 degrees in the longitudinal direction (arrow Y direction: see FIG. 3). After that, 1 to 4 cm was torn and the rest was completely torn in the direction of arrow Y. In addition, the cut end was not rattling and was not cut linearly.

  In addition, in Example 1, although the case where the adhesive layer 14 was arrange | positioned in the side in which the closed cell 12 of the cap film 13 was formed was demonstrated, not only this but the adhesive layer 14 is shown in FIG. As shown, the base film 11 may be disposed. In this case, a back film 15 can be disposed on the side of the cap film 13 where the closed cells 12 are formed.

  Moreover, in Example 1, although the case where the adhesive layer 14 was arrange | positioned to the whole surface of the side in which the closed cell 12 of the cap film 13 was formed was demonstrated, not only this but the adhesive layer 14 is a cap film. It is only necessary to be disposed at least at a part (that is, an arbitrary place) on the side where the 13 closed cells 12 are formed.

  Next, a self-adhesive cellular cushion sheet according to Example 2 of the present invention will be described with reference to the drawings.

  6 is a perspective view showing a self-adhesive foam cushioning sheet according to Example 2 of the present invention, FIG. 7 is a cross-sectional view of the self-adhesive foam cushioning sheet shown in FIG. 6, and FIG. It is a perspective view showing the state where the self-adhesive cellular cushion sheet shown is laterally split from an arbitrary side edge portion by hand tearing.

  In the second embodiment, the same members as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 6 to 8, the difference between the self-adhesive foam cushioning sheet 2 according to Example 2 and the self-adhesive foam cushioning sheet 1 according to Example 1 is that the base film 21 itself has a width. This is a point in which a thermoplastic film 22 that can be laterally split in the width direction is laminated on the base film 21 without being composed of a thermoplastic film that can be laterally split in the direction.

  That is, as shown in FIGS. 6 to 8, the self-adhesive foam cushioning sheet 2 according to Example 2 is disposed on one surface of the base film 21 and the base film 21, and has a large number of closed cells 12. The cap film 13 provided, the pressure-sensitive adhesive layer 14 disposed on the side of the cap film 13 where the closed cells 12 are formed (the surface opposite to the surface on which the base film 21 is disposed), and the base And a thermoplastic film 22 that can be laterally split in the width direction and is disposed on the other surface of the film 21.

The base film 21 is composed of a low density polyethylene film (thickness: about 15 μm) formed by the T-die method.

The thermoplastic film 22 is composed of a high-density polyethylene film (density: about 0.945, thickness: about 10 μm) molded at a stretch ratio of blow ratio 4.5. The thermoplastic film 22 is laminated on the other surface of the base film 21 by heat fusion.

In addition, as a high-density polyethylene film which shape | molds the thermoplastic film 22, a density is 0.93-0.98g / cm < ³ > and MFR less than 0.1 can be used conveniently.

  Next, when the lateral tearing performance of this self-adhesive cellular cushion sheet 2 and the comparative product obtained in Example 1 was performed in the same manner as in Example 1, similar results were obtained.

  In Example 2, the case where the thermoplastic film 22 that can be laterally split in the width direction is disposed on the surface of the base film 21 opposite to the surface on which the cap film 13 is disposed is described. However, the cap film 13 may be disposed on the surface of the base film 21 on which the thermoplastic film 22 is disposed as shown in FIG.

  Next, a self-adhesive cellular cushion sheet according to Example 3 of the present invention will be described with reference to the drawings.

  FIG. 10 is a cross-sectional view of the self-adhesive cellular cushion sheet according to Example 3 of the present invention. In the third embodiment, the same members as those described in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 10, the difference between the self-adhesive cellular cushion sheet 3 according to Example 3 and the self-adhesive cellular cushion sheet 2 according to Example 2 is that the base film 21 is laterally split in the width direction. Instead of laminating the possible thermoplastic film 22, a thermoplastic film 22 that can be laterally split in the width direction is laminated between the cap film 13 and the pressure-sensitive adhesive layer 14.

  That is, the self-adhesive foam cushioning sheet 2 according to Example 3 is provided with a base film 21 and a cap provided with a large number of closed cells 12 on one surface of the base film 21 as shown in FIG. The film 13, the thermoplastic film 22 disposed on the side of the cap film 13 where the closed cells 12 are formed (the surface opposite to the surface on which the base film 21 is disposed), and the thermoplastic film 22 And an adhesive layer 14 disposed on the top.

  Next, when the lateral tearing performance of this self-adhesive cellular cushion sheet 3 and the comparative product obtained in Example 1 was performed in the same manner as in Example 1, similar results were obtained.

  In Example 3, the base film 11 may be used instead of the base film 21. Further, a thermoplastic film 22 may be laminated on the base film 21.

  Further, the pressure-sensitive adhesive layer 14 may be disposed on the surface of the base film 21 opposite to the surface on which the cap film 13 is disposed.

  Further, as shown in FIG. 11, a recess 31 may be formed at a position facing the closed cell 12 of the base film 21. By forming the recess 31 in this way, when unwinding the self-adhesive cellular cushion sheet 3 of any length from the self-adhesive cellular buffer sheet 3 wound in a roll, the adhesive layer 14 is The base film 21 can be easily peeled off and can be easily unwound. In this case, the area of the recess 31 is preferably 7000 mm2 to 8500 mm2 per 10000 mm2 of the self-adhesive cellular cushion sheet.

  In addition, this recessed part 31 can also be formed in the base film 11. FIG.

It is a perspective view which shows the self-adhesive foaming cushion sheet concerning Example 1 of this invention. It is sectional drawing of the self-adhesive cellular shock absorbing sheet shown in FIG. FIG. 2 is a perspective view showing a state where the self-adhesive cellular cushion sheet shown in FIG. 1 is laterally split from an arbitrary side edge portion by manual tearing. It is a schematic diagram which shows a part of manufacturing process of the self-adhesive cellular shock absorbing sheet shown in FIG. It is sectional drawing which shows the self-adhesive foaming buffer sheet concerning the other Example of this invention. It is a perspective view which shows the self-adhesive foaming cushion sheet concerning Example 2 of this invention. It is sectional drawing of the self-adhesive cellular shock absorbing sheet shown in FIG. FIG. 7 is a perspective view showing a state where the self-adhesive cellular cushion sheet shown in FIG. 6 is laterally split from an arbitrary side edge portion by manual tearing. It is sectional drawing which shows the self-adhesive foaming buffer sheet concerning the other Example of this invention. It is sectional drawing which shows the self-adhesive foaming buffer sheet concerning Example 3 of this invention. It is sectional drawing which shows the self-adhesive foaming buffer sheet concerning the other Example of this invention.

Explanation of symbols

1, 2, 3 Self-adhesive cellular cushion sheet 11, 21 Base film 12 Closed cell 13 Cap film 14 Adhesive layer 22 Thermoplastic film 31 that can be laterally split in the width direction Recess

Claims (7)

This is a self-adhesive cellular cushion sheet in which an adhesive layer is disposed on at least a part of one surface of a cellular cushion sheet obtained by laminating a cap film having a large number of closed cells on one surface of a base film. And
The base film is, Ri Na is composed of a thermoplastic film that can be torn transverse to the width direction from an arbitrary side edge portion,
A self-adhesive cellular cushion sheet , wherein the thermoplastic film is formed by inflation molding . This is a self-adhesive cellular cushion sheet in which an adhesive layer is disposed on at least a part of one surface of a cellular cushion sheet obtained by laminating a cap film having a large number of closed cells on one surface of a base film. And
On the base film, Ri Na and thermoplastic films that can tear the lateral width direction from an arbitrary side edge portion are laminated,
A self-adhesive cellular cushion sheet , wherein the thermoplastic film is formed by inflation molding . This is a self-adhesive cellular cushion sheet in which an adhesive layer is disposed on at least a part of one surface of a cellular cushion sheet obtained by laminating a cap film having a large number of closed cells on one surface of a base film. And
The cap film is laminated with a thermoplastic film that can be laterally split from any side edge in the width direction,
A self-adhesive cellular cushion sheet , wherein the thermoplastic film is formed by inflation molding . The self-adhesive cellular cushion sheet according to claim 3, wherein the base film is composed of a thermoplastic film that can be laterally split from an arbitrary side edge portion . The self-adhesive cellular cushion sheet according to claim 3, wherein a thermoplastic film that can be laterally split from an arbitrary side edge portion is laminated on the base film. The self-adhesive cellular cushion sheet according to any one of claims 1 to 5 , wherein the thermoplastic film comprises a high-density polyethylene film molded at a blow ratio of 4 or more. The self-adhesive cellular cushion sheet according to any one of claims 1 to 6 , wherein the thermoplastic film is a low-density polyethylene film molded at a blow ratio of 3 or less.

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