JP2003040322A - Shape memory body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shape memory body having an improved deformed shape keeping characteristic. SOLUTION: This shape memory body 1 is structured of two sheets of covering materials 2 and three plastic resin core materials 3 inserted between them. The core materials 3 are sent to a heat contact bonding roll heated hot enough to adhere the materials 2 mutually and the materials 2 with the materials 3 after they go through a preliminary heating bath set at a temperature equal to that for melting the surface of the materials 3. Between the rolls, in a condition where the materials 3 are held by the materials 2, the materials 3 are strongly pressed to bond together. By this, materials 2 mutually and the materials 2 with the materials 3 are pressed to bond together forming the memory body 1 having three core materials 3 held in a line between both materials 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shape retainer for retaining the shape of a sheet or bag.

In the present specification, the "deformed shape holding state" refers to a state in which the original shape is maintained even if the external force ceases to act, and the shape is maintained as it is.

[0003]

2. Description of the Related Art Conventionally, a metal wire material such as annealed copper or aluminum is used as a core material, and the core material is sandwiched by a covering material such as an elongated vinyl tape or a resin film and bonded to the sheet-like or bag-like binding material. Or, it is used as a binding material. These binding materials or binding materials can be easily cut, easily bent or twisted with fingers, and since the core material is a metal wire material having plastic deformation characteristics, after bending or twisting, It retains its original shape without returning to its original shape even when no external force is applied, and is excellent in binding when twisted.

[0004]

However, when the above-mentioned metal wire rod as a core material is intended to be used for packaging of mass-produced foods, it reacts in a foreign substance contamination inspection by a metal detector performed at the final stage. Therefore, there is a problem that the final safety confirmation cannot be performed, and there is a problem that a residue is generated in the incineration process at the time of disposal.

In order to deal with the problem of the binding material having the metal wire as the core material, a binding material having one resin wire as the core material has been proposed in place of the metal wire material, but the deformed shape is also proposed. In some cases, the property of maintaining the holding state, that is, the plastic deformation performance (molding performance), the deformed shape retention performance (molding retention performance), and the binding property may not be sufficient.

[0006] Further, a thin plate binding material composed of only a single resin prepared by blending a plasticity-imparting agent with a plastic resin has been proposed, but it can be said that it has sufficient characteristics to maintain a deformed shape retention state. There were times when it wasn't.

Therefore, in order to solve the above-mentioned problems, the present invention has the characteristics of maintaining a deformed shape retention state, that is, plastic deformation performance (molding performance) and deformed shape retention performance (molding retention performance).
It is an object of the present invention to provide a shape retainer having increased

[0008]

To achieve the above object, in the shape-retaining body of the present invention, a core material having plasticity is sandwiched and held between two resin covering materials, In a shape-retaining body capable of maintaining a deformed shape-retaining state by plastic deformation of a core material,

The core material made of a thermoplastic resin has a strip shape.

Further, in the shape-retaining body of the present invention, the core material having plasticity is held by being sandwiched between two covering materials made of resin having a melting point higher than that of the core material. In a shape-retaining body capable of maintaining a deformed shape-retaining state by plastic deformation of a core material,

A plurality of core materials made of resin are sandwiched between the respective coating materials.

The shape-retaining body of the present invention constructed as described above has a plurality of core materials made of resin, so that it has a higher deformed shape-retaining state than a binding material having one core material made of resin. It is possible to obtain the property of keeping and the cohesive force.

Further, the shape-retaining body of the present invention has a core material having plasticity, and a covering material which holds the core material and is made of resin, and maintains a deformed shape-retaining state by plastic deformation of the core material. In the shape retainer that can

It is characterized in that the core material is held between one sheet of the covering material which is folded at both side ends in the width direction and bound into a bag.

Further, in the shape-retaining body of the present invention, of the two covering materials, one of the covering materials is folded back so that both side portions in the width direction wrap around both widthwise ends of the other covering material. It may be

In the shape-retaining body of the present invention, the covering material is
It plurality of layers may be one in which are laminated, the core ^material, may be one having a sectional area of 0.05 mm 2 1.0 mm ^2, the core material, 200 MPa
The core material may have the above breaking strength, or the core material may have a tensile elastic modulus of 5000 MPa or more.

Further, in the shape-retaining body of the present invention, each layer is
It may include a layer selected from the group consisting of a layer made of a thermoplastic resin, a layer made of paper mixed with a thermoplastic resin, a layer made of paper, and a layer made of a metal foil.

In the shape-retaining body of the present invention, the layers forming the facing surfaces of the coating materials facing each other are layers made of thermoplastic resin or layers made of paper mixed with the thermoplastic resin. In the case of, the respective facing surfaces may be melt-bonded to each other, or each layer forming the facing surfaces facing each other of each coating material is a layer made of paper,
Alternatively, in the case of a layer made of a metal foil, the opposing surfaces may be joined together with an adhesive, a pressure-sensitive adhesive, or an adhesive film.

The shape-retaining body of the present invention may include at least one core material made of a predetermined material.

Further, the shape-retaining body of the present invention may be one in which the surface of the core material is melted and the core material is melt-bonded to the coating material, or the surface of the core material is melted, The core material may be melt-bonded to an adhesive, a pressure-sensitive adhesive, or an adhesive film.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic sectional view of an embodiment of the shape-retaining body of the present invention, and FIG. 2 is a perspective view of the shape-retaining body shown in FIG.

The shape-retaining body 1 of this embodiment has three core members 3 made of a resin having plasticity between two covering members 2.
Is sandwiched between.

Each core material 3 is a crystalline heat composed of one or more of polyolefin resin (including polyethylene resin and polypropylene resin), polyamide resin, polybutylene terephthalate resin, polyethylene terephthalate resin, biodegradable polymer and the like. Plastic synthetic resin, glass fiber, talc, mica, calcium carbonate, magnesium hydroxide, alumina, zinc oxide, magnesium oxide, aluminum hydroxide, silica alumina, titanium oxide, calcium oxide, calcium silicate, basic magnesium carbonate, carbon fiber , An inorganic filler such as carbon black.
The core material 3 is not limited to the above-mentioned materials as long as it is a resin having plasticity.

The melting point of each coating material 2 is equal to or higher than the melting point of the core material 3, and when polyethylene is used as the material of the core material 3, the material is preferably a polymer that is heat-sealed with polyethylene.

In addition, thermoplastic films such as PVC, PE, PET, etc., and paper are also suitable as the material of each coating material 2, but the material is not limited to these.

Further, the covering material 2 may be formed of a single layer as shown in FIG. 1, but may be formed of a plurality of layers as shown in FIG. Also, FIG.
When using two covering materials 2 as shown in (a) and FIG. 3 (b), the two covering materials 2 may both be formed of a plurality of layers. Omitted, but 2
One of the covering materials 2 may be formed of a plurality of layers. Thus, in the case of being formed of a plurality of layers, each layer is a layer made of a thermoplastic resin, a layer made of paper mixed with a thermoplastic resin, a layer made of paper, a layer made of non-woven fabric, a layer made of metal foil. May be included. For example, in FIG. 3A, the first layer 2c is a layer made of a thermoplastic resin or a layer made of paper mixed with a thermoplastic resin, and the second layer 2d is a layer made of a metal foil such as aluminum. It may be one that does.

When the first layer 2c, which is each layer forming the inner surfaces 2a facing each other of each coating material 2, is a layer made of a thermoplastic resin or a layer made of paper mixed with a thermoplastic resin. The inner surfaces 2a can be melt-bonded to each other.

Further, when the first layer 2c of each covering material 2 is a layer made of paper or a layer made of metal foil, FIG.
As shown in (b), the respective covering materials 2 are laminated, and
The bonding layer 2f for fixing and holding the core material 3 is the first layer 2c.
It may be provided above. This bonding layer 2
f may be an adhesive, a pressure-sensitive adhesive, an adhesive film, an adhesive film, or the like as long as it can bond the respective covering materials 2 and fix and hold the core material 3. The bonding layer 2f is formed in order to obtain a stronger bond when the first layer 2c is a layer made of a thermoplastic resin or a layer made of paper mixed with a thermoplastic resin. May be.

Next, the shape and performance of the core material 3 will be described.

The core material 3 of the present embodiment is approximately 0.05 mm ²
It is a stretched linear material mainly composed of a thermoplastic resin having a cross-sectional area of 1.0 mm ² . In addition, the core material 3 of the present embodiment
The shape is not limited to a wire having a circular cross section, and may be an elliptical shape or a square shape. In short, any shape may be used as long as the wire has plastic deformability. For example, as shown in FIG. 4, the shape-retaining body has a rectangular cross section, a tape shape,
Alternatively, the ribbon-shaped strip-shaped core material 3a may be used as the core material.

The core material 3 of this embodiment has a high breaking strength of 200 MPa or more and a tensile elastic modulus of 50.
It is desirable that the drawn linear material has a high elastic modulus of 00 MPa or more. This is because it is necessary to bring the breaking strength as high as possible in order to obtain a shaping performance that is as close as possible to a metal wire, and according to the experiments of the inventors, in order to obtain a good shaping ability. Is preferably 200 Mpa or more. On the other hand, the tensile elastic modulus of 5000 MPa or more can prevent the wire rod from being broken when repeated bending is required.

Next, enlarged sectional views of another example of the shape-retaining body in the present embodiment are shown in FIGS.

In the shape-retaining body shown in FIG. 5, the core material 3 is held by being sandwiched between the two first covering materials 20a and 20b, and the second covering material 20b. Both side portions 22 in the width direction are folded back so as to wrap both side portions in the width direction of the first covering material 20a.

The shape-retaining body shown in FIG.
The core material 3 is held by a bag that is bound with a chisel. That is, the second side end portion 24b in the width direction of the covering material 2
By folding back the first side end portion 24a so that the inner side is inside, one sheet of the covering material 2 is bound into a bag, and the core material 3 is held between the one sheet of covering material 2.

In this embodiment, in order to impart the property of maintaining a higher deformed shape retention state, that is, the plastic deformation performance (molding performance) and the stronger deformed shape retention performance (molding retention performance), high strength tension is applied. By linearizing a thermoplastic resin having the above, the absolute volume thereof is reduced to obtain a core material 3 which is easy to plastically deform and large, and the core material 3 and the flexible covering material 2
By using a combination of the above, it has been found that an entirely new shape of the holding body 1 can be obtained in which the shape holding body 1 is provided with a constant width shape and at the same time a stronger deformed shape holding performance is obtained without deteriorating the plastic deformation performance. Of.

The thickness and the number of core materials 3 used can be determined by the required plastic deformation force and deformed shape holding force. That is, even if a large plastic deformation force is required, if a large deformed shape holding force is required, increase the number of core members 3 or increase the wire diameter, and conversely deform with a small plastic deformation force (molding). If required, use a small number or use a core material with a thin wire diameter. Alternatively, the shape of the core material may be a band shape as shown in FIG. 4 depending on the usage of the shape retainer 1.

Next, as shown in FIG. 3 (b), the upper and lower two covering materials 2 have a three-layer structure including a first layer 2c, a second layer 2d and a bonding layer 2f. Taking No. 1 as an example, an example of a manufacturing method thereof will be described.

The core material 3 is sufficient for adhering the coating materials 2 to each other and the coating material 2 and the core material 3 after passing through a preheating tank set to a temperature at which the surface of the core material 3 is sufficiently melted. It is sent to a heating pressure bonding roll heated to a temperature, and is strongly pressure bonded while being sandwiched between the rolls by the coating material 2. As a result, the covering materials 2 and the covering material 2 and the core material 3 are pressure-bonded to each other, and the shape-holding body 1 in which the three core materials 3 are held in parallel between the covering materials 2 is formed. The core materials 3 held between the covering materials 2 may be held between the covering materials 2 by pressing the core materials 3 themselves onto the covering material 2 from above and below,
As shown in FIG. 3, not only the core materials 3 are pressed onto the covering material 2 from above and below, but also the covering materials 2 and the core materials 3 may be pressed simultaneously. In this case, in order to strengthen the adhesion between them, an adhesive agent that bonds well the bonding layer 2f on the first layer 2c made of a thermoplastic resin film to the core material 3 instead of the film-like adhesive film is used. It may be applied.

In this embodiment, as an example, the shape retainer 1 having the three core members 3 is shown in FIG. 1, but the number of the core members 3 may be two or four depending on the application. It may be more than a book. Further, each core material 3 may include at least one core material 3 made of a predetermined material, that is, the material of each core material 3 may be the same or different.

As described above, the shape retainer 1 of this embodiment
Is a thin plate having a structure in which three resin cores 3 are sandwiched between covering materials 2 so that a conventional binding material having one resin wire as a core or a structure made of only a single resin is used. Characteristics that could not be achieved with a uniform binding material, maintaining a high deformed shape retention state equivalent to a binding material with a metal wire as a core material,
And a cohesive force can be obtained. Further, in the shape-retaining body 1 of the present embodiment, the core material 3 is made of resin, so that the covering material 2
Also, if a non-metal material such as paper or resin that can be incinerated, no residue is generated even when the incineration process is performed at the time of disposal. Furthermore, since the shape-retaining body 1 of the present embodiment does not react with the metal detector even when it is used for packaging food, it is mistaken as a metal foreign substance in the foreign substance mixture inspection using the metal detector. Will not be detected.

EXAMPLE In this example, the covering material 2 is made of P having a thickness of 50 μm.
The ET film and the core material 3 are 3000 denier (diameter approximately 0.
67 mm) wire rod with a width of 4.0 mm 1
It was created. Then, the mechanical performance of the shape-retaining body 1,
The plastic deformation performance (molding performance) and the deformed shape retention performance (molding retention performance) were examined.

FIG. 7 shows the plastic deformation performance (molding performance) and the deformed shape retention performance (molding retention performance) of the shape-retaining body of this embodiment.
The explanatory view showing the measurement situation of is shown. FIG. 7A is a perspective view of the sample in a state where a load is applied to the curved portion of the sample that is bent in a loop shape, and FIG. 7B is a deformation angle (molding angle) of the sample in a state where the load is removed. FIG. 7C is a perspective view showing an example of FIG.
FIG. 7 is a conceptual diagram showing a deformation angle of the sample of FIG. 7B and a return angle of the sample when the sample is left standing.

Similarly, as a comparative example, a thin plate-shaped binding material made of only a single resin was examined for its mechanical performance, plastic deformation performance, and deformed shape retention performance.

Table 1 shows the measurement results of the mechanical performance, the plastic deformation performance, and the deformed shape retention performance of the shape retainer of this example and the thin plate binding material of the comparative example.

[0045]

[Table 1]

As shown in the results of Table 1, the shape-retaining body 1 of the present embodiment has the characteristics that the shaping degree is 170 degrees and the restoration rate is 1.2%, and the shaping degree is 147 degrees. Restoration rate 2.7
%, It was found that plastic deformation is easier and the deformed shape retention state is much better than the thin plate binding material of Comparative Example.

[0047]

[Effects of the Invention] A binding material having one resin wire as a core material,
Or, in the case of a thin plate binding material composed of only a single resin, it will return to its original shape when the external force stops acting,
Although the function of retaining the shape was insufficient, as described above, the shape retainer of the present invention has a property of maintaining a high deformed shape retaining state by having a plurality of core materials made of resin, and a binding force. Equivalent characteristics could be obtained. Further, the shape-retaining body of the present invention, since each core material is resin, paper,
Alternatively, if it is a non-metal material that can be incinerated, such as resin, it will not leave a residue in the incineration process, and even if it is used for food packaging, it will be made of metal by a foreign substance contamination inspection using a metal detector. It will not be erroneously detected as foreign matter.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an embodiment of a shape retainer according to the present invention.

FIG. 2 is a perspective view of the shape retainer shown in FIG.

FIG. 3 is a schematic cross-sectional view of another embodiment of the shape retainer according to the present invention.

FIG. 4 is a schematic perspective view of another embodiment of the shape retainer according to the present invention.

FIG. 5 is a schematic cross-sectional view of another embodiment of the shape retainer according to the present invention.

FIG. 6 is a schematic cross-sectional view of another embodiment of the shape retainer according to the present invention.

FIG. 7 is an explanatory diagram showing a measurement state of plastic deformation performance (molding performance) and deformed shape retention performance (molding retention performance) of the shape-retaining body of one embodiment of the present invention.

[Explanation of symbols]

1 Shape retainer 2 coating material 2a Crimping part 2b inside 2c first layer 2d second layer 2f bonding layer 3 core material 3a Band-shaped core material 20a First coating material 20b Second covering material 21 side end 22 side 24a First side end 24b Second side end

Claims (14)

[Claims] 1. A core material having plasticity is made of resin.
In a shape-holding body that is sandwiched and held between a plurality of covering materials and that can maintain a deformed shape-retaining state by plastic deformation of the core material, the shape of the core material made of a thermoplastic resin is a strip shape. A shape retainer characterized by being present. 2. A core material having plasticity is sandwiched and held between two covering materials made of a resin having a melting point equal to or higher than the melting point of the core material, and the core material is deformed by plastic deformation. A shape retainer capable of maintaining a holding state, wherein a plurality of the core materials made of resin are sandwiched between the respective covering materials. 3. A shape-retaining body comprising: a core material having plasticity; and a covering material which holds the core material and is made of resin, and which can maintain a deformed shape-retaining state by plastic deformation of the core material. The shape-retaining body, wherein the core material is held between the one covering material that is folded in a bag by folding back both ends in the width direction. 4. The one of the two covering materials is folded back so that both side portions in the width direction of the one covering material wrap around both ends in the width direction of the other covering material. The shape retainer according to item 2. 5. The shape retainer according to claim 1, wherein the coating material is formed by laminating a plurality of layers. 6. The core material is 0.05 mm ^{2 to} 1.0 m
The shape retainer according to claim 1, having a cross-sectional area of m ² . 7. The shape retainer according to claim 1, wherein the core material has a breaking strength of 200 MPa or more. 8. The shape retainer according to claim 1, wherein the core material has a tensile elastic modulus of 5000 MPa or more. 9. Each of the layers is a layer made of a thermoplastic resin,
The shape retainer according to any one of claims 5 to 8, which comprises a layer selected from the group consisting of a paper layer mixed with a thermoplastic resin, a paper layer, and a metal foil layer. 10. When the respective layers forming the facing surfaces of the coating materials facing each other are layers made of the thermoplastic resin or layers made of paper mixed with the thermoplastic resin, The shape retainer according to claim 9, wherein the facing surfaces are fusion-bonded to each other. 11. When the respective layers forming the respective facing surfaces of the respective covering materials facing each other are layers made of the paper or layers made of the metal foil, the facing surfaces are bonded with an adhesive or an adhesive. The shape retainer according to claim 9, wherein the shape retainer is bonded with an agent or an adhesive film. 12. The shape retainer according to claim 1, comprising at least one core material made of a predetermined material. 13. The method according to claim 1, wherein the surface of the core material is melted and the core material is melt-bonded to the coating material.
The shape retainer according to any one of 2 above. 14. The method according to claim 11, wherein the surface of the core material is melted and the core material is melt-bonded to the adhesive, the pressure-sensitive adhesive, or the adhesive film. Shape retainer.