JPH10305849A - Shape-retaining body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily retain the opened or closed state of the opening of a bag body when it is required and perfectly incinerate the opening together with the bag body, by attaching a plastically deforming wire-form body and/or a tape-form body made of an inflammable thermoplastic resin to at least a part of a sheet-form body or a bag-form body made of a flexible material. SOLUTION: A bag-form body 2 is made of a flexible material such as film or cloth, and the opening thereof can not be retained in the opened or closed state for itself and also the flexible material can not be retained in the opened or closed state for it self when a bag-form body is made of nonwoven cloth, sheet, net except film or cloth. Both-face tapes are stack on the opening 3 of the bag-form body 2 through various methods such as adhesion, welding with heat, or insertion into turning-back parts of the edges, in the shape- retaining body 4 and these methods are appropriately selected in accordance with the shape of the bag-form body. In this way, a flexible sheet-form body or a bag-form body without the self-standing property can retain an arbitrary shape by the characteristic of a shape-retaining material attached to a part thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shape holder for a sheet or a bag, and more particularly, to a flammable sheet or a bag made of a flexible material. A sheet-like material or a bag-like material that is capable of holding a deformed state of a sheet-like material or holding an opening of a bag-like material in an open and closed state by attaching a shape holding body having And a shape holder.

[0002]

2. Description of the Related Art Conventionally, a bag made of a flexible material such as a film or a cloth is opened by a finger when necessary, the state is held by some means, an object is put in, and the opening is closed again by a finger and closed by some means. Used by fixing. For example, the disposal bags used in hospitals are usually made of polyethylene, but in the case of surgery etc., they are hung in an open state near the operating table to dispose of gauze etc. used for surgery. The product is put in, and after use, the mouth is closed and incinerated.

[0003] At this time, conventionally, in order to maintain the open state, the waste bag is fixed and used with the opening of the waste bag opened in a ring-shaped metal fitting or the like. A thin bar made of stainless steel is attached, and by using the shape retention of the bar, the bar can be used with the opening always open. The reason that this bar is made of aluminum or stainless steel is to prevent injuries to the incinerator due to needles etc. in the disposal bag and to prevent hospital-acquired infection by blood or pathogens adhering to the needles etc. This is to enable a magnetic detector to detect a steel injection needle or the like in advance. When disposing of the bag, it is necessary to close the opening of the bag into which the waste is put by some means so that the contents do not spill.

[0004]

However, in the case of using the above-mentioned ring-shaped metal fitting by simply fixing the opening of the disposal bag to the above-mentioned ring-shaped metal fitting in the operating room, the ring-shaped metal fitting or the like is also used after being used in an operating room. It is necessary to be completely sterilized, and furthermore, it is troublesome to fix the waste bag in a state in which the opening of the waste bag is opened in a ring-shaped metal fitting or the like. If a thin aluminum or stainless steel bar is attached to the opening of the waste bag, this will increase the cost.The aluminum or stainless steel bar does not burn even after incineration, and remains in the incinerator. , It is necessary to sweep it out and discard it.

[0005] In addition, aprons used for meals for infants and sick persons who need nursing care are not turned up or formed as expected due to being made of flexible materials. People may have unexpected inconveniences. In addition, the apron used for meals of the above-mentioned infants and sick people who need nursing care is often provided with a pocket for preventing food from falling to the floor even if it spills. If the open state is not maintained, the spilled food falls to the floor without entering the pockets, and is useless. Therefore, in such a case, it is desired that the shape of the apron and the open state of the pocket be maintained in the originally desired shape.

Therefore, an object of the present invention is to eliminate the need for extra sterilization work and to easily hold the opening of a bag-like material made of a flexible material in an open or closed state when required, and
An object of the present invention is to provide an inexpensive bag-like shape holder that can be completely incinerated together with the bag-like material by incineration. Another object of the present invention is to provide a shape holder capable of holding its shape in a deformed state even when used in the form of a sheet such as an apron.

[0007]

Means for Solving the Problems The present invention has been proposed to achieve the above object, and has the following structure. That is, according to the present invention, a plastically deformable linear body and / or a tape-shaped object made of a flammable thermoplastic resin is attached to at least a part of a sheet-shaped material or a bag-shaped material made of a flexible material. There is provided a shape holder characterized by the following.

Further, according to the present invention, there is provided the above-mentioned sheet-like or bag-like shape holder, wherein the above-mentioned sheet-like material is an apron.

Further, according to the present invention, the thermoplastic resin having plastic deformability comprises: a first component comprising polyethylene or a mixture of the polyethylene and another polyolefin;
A combination of a second component having a thermoplastic resin substantially as a main component other than the first component, wherein the first component is a core material;
A composite stretched product having a core-sheath structure in which the second component is a sheath material, and the plastic stretchability of the composite stretched product is 18 times that of the composite stretched product.
The shape holder of the sheet-like material or the bag-like material having a return angle of 20 degrees or less by bending at 0 degrees and 90 degrees is provided.

Further, according to the present invention, the first component comprises:
The shape holder of the above-mentioned sheet-like material or bag-like material, which is a high-density polyethylene having an intrinsic viscosity [η] of less than 3.5 dl / g, is provided.

Further, according to the present invention, the second component comprises:
The above-mentioned sheet-like or bag-like shape holder, which is made of a polymer having heat-fusibility with the first component, and is configured to cover at least 50% or more of the surface of the first component as a core material. Is provided.

According to the first aspect of the present invention, a flammable shape holder is attached to at least a part of a sheet or bag made of a flexible material such as a film or cloth, and the shape holder is required. An object of the present invention is to provide a sheet-like or bag-like shape holder that can be deformed from time to time so that an arbitrary shape of the sheet-like material or the opening and closing state of the opening of the bag-like material can be maintained.

[0013] According to this, it is possible to deform the shape holder as needed to bring the sheet-shaped object into a preferred shape and to open and close the opening of the bag-shaped object. The object itself does not react to not only the magnetic detector but also the metal detector, and can be returned to the original shape after use. In the case of bags,
If the opening of the bag is twisted after the contents are put in, the bag is closed, and the bag can be discarded or incinerated.

Another object of the present invention is to provide a shape-maintaining member attached to an edge of an apron as the shape-maintaining body, so that the function of the apron at the time of use is sufficiently exhibited. . As a result, the usability of the apron for meals for infants and sick persons requiring care can be improved.

According to a third aspect of the present invention, the thermoplastic resin having plastic deformability comprises a first component which is polyethylene or a mixture of the polyethylene and another polyolefin, and a thermoplastic resin other than the first component. 2nd as main component
And a composite stretched product having a core-sheath structure in which the first component is a core material and the second component is a sheath material, and the plastic stretchability of the composite stretched product is 18%.
The above function can be more suitably exhibited by specifying the shape holder of a sheet-like material or a bag-like material having a return angle of 0 ° or less by bending at 0 ° and 90 °. In addition, since the composite stretched product has excellent plastic deformability, the open and closed states can be suitably maintained.

The fourth and fifth aspects of the present invention are embodiments of the third aspect of the present invention. According to this, a general-purpose polyethylene can be used as the polyethylene, and the composite stretched product only needs to cover at least 50% or more of the surface of the first component used as the core by the second component, and the production is simplified. .

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a sheet-like or bag-like shape holding body showing an embodiment of the present invention,
Reference numeral 1 denotes a sheet-like or bag-like shape holder, and the sheet-like or bag-like shape holder 1 is a sheet-like or bag-like thing 2 made of a flexible material such as a film or cloth. A flammable shape holder 4 is attached to a portion, for example, an edge portion of a sheet-like material or an opening 3 of a bag-like material, and the shape holder 4 is deformed when necessary. Alternatively, the bag 2 holds an arbitrary shape.

In the case of a sheet-like material, an arbitrary shape means
It means a suitable shape when used, a folded shape when not in use, and the like, and in the case of a bag-like material, means an open state of the opening 3 and a closed state. In any case, according to the present invention, a flexible sheet-like material or bag-like material having no self-supporting property is formed by a property of a shape holding material attached to a part thereof.
An arbitrary shape can be maintained.

As an example, an embodiment in which a shape maintaining material is attached to a bag-like material will be described. The bag-like material 2 is made of a flexible material such as a film or cloth, and the condition is that the opening 3 cannot be held in an open or closed state by itself. Examples of the flexible material include a non-woven fabric, a sheet,
Included are all types of bags, such as nets, papers, woven and nonwoven fabrics made of inorganic materials, natural materials, and synthetic thermoplastic resin materials, which cannot be held in the open and closed state when the opening 3 is made into the bag-like material 2. Further, the shape of the bag-like material 2 is not limited to the bag of FIG. 1 and may be a pocket 11 provided in the apron 10 for nursing care for the elderly or the apron 10 for infant. In addition, bag-like material 2
Not only the bag whose bottom is closed but also a chute 12 having both ends open as shown in FIG.

The shape holder 4 is provided with the opening 3 of the bag 2.
It is attached by a method such as bonding with a double-sided tape, heat fusion, or insertion into a folded portion of the edge, and the method may be appropriately selected depending on the form of the bag-like material. The means for attaching the shape holder is the same for a sheet-like material.

As shown in the bag 2 of FIG.
Even if the shape holder 4 is attached to only one side of the pocket 11 or the shape holder 4 is attached to one side of the opening 11a of the pocket 11 for taking in the spilled food at the time of eating, as shown in the apron 10 in FIG. Even if the shape holder 4 is attached over the entire circumference of the upper opening 12a and the lower opening 12b as in the open chute 12 in FIG. 3, as in the bag 2 in FIG. The shape holder 4 may be attached over the entire circumference of the opening 3.

Further, the shape holder 4 may be attached to the opening 3 of the bag 2 only once, or two or more, and as shown in FIG. Both sides of the shape holder 4 attached to one side of the opening 3 may be extended in a free state. In this case, the extended pieces 4a, 4a
If the opening 3 is closed after the use of the bag-like material 2 and the unit is tied using its shape retention, the opening 3 is closed and does not open. FIG. 6 shows a state in which a folded portion is formed at the edge of the sheet-like material, and a shape holding material is inserted therein.

The shape holding member 4 is not particularly limited as long as it is a flammable material having shape holding properties. Usually, polyethylene, other polyolefins, polyacetals and the like are used. Further, the shape holding body 4 is more preferably a composite plastic deformation product obtained by thermally fusing a combustible material having shape holding properties with a thermoplastic resin having other characteristics.

That is, in this composite plastically deformed product, the core material is composed of the first component which is polyethylene or a mixture of the polyethylene and another polyolefin, and the sheath material is substantially composed of a thermoplastic resin other than the first component. It is composed of a composite stretched product composed of a second component as a component and composed of a combination of the first component and the second component.

The first component polyethylene constituting the core material has an intrinsic viscosity [η] of less than 3.5 dl / g, preferably 1.0 dl / g to less than 3.5 dl / g. High density polyethylene is preferred. With polyethylene having an intrinsic viscosity [η] of 3.5 dl / g or more, the extrusion method is limited, and only one stretched product can be obtained per extruder, or the number of production steps increases and productivity decreases. I can not use it. As the other polyolefin of the first component, an olefin homopolymer such as polypropylene, polybutene, and poly-4-methylpentene-1 or an olefin copolymer obtained by copolymerizing another α-olefin with the olefin homopolymer is used. .

When the polyethylene is stretched, it is elastically deformed in proportion to the tensile stress, and the elongation increases accordingly to reach the yield point. Beyond the yield point, the polyethylene begins to develop plastic deformability once the tensile stress has dropped. After the yield point, the elongation decreases once, reaches the limit of the internal strain, and the polyethylene gradually elongates, and finally becomes white and breaks.

The whitening of the polyethylene is induced by the addition of various inorganic fillers, which induces shear failure and facilitates plastic deformation. Inorganic fillers include 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, carbon black and the like are exemplified.

The second component is preferably a polymer which is heat-sealed with the polyethylene of the first component during coextrusion, so as to enhance the adhesion to other polymers or to provide a coloring which cannot be achieved with polyethylene. EEA thermoplastic resin, ethylene vinyl alcohol copolymer, vinyl acrylate polymer, EAA thermoplastic resin, low density or medium density polyethylene, EPT
Etc. are exemplified.

In the case where a polymer having no heat-fusing property with polyethylene as the first component is used as the second component, a polymer having a melting property intermediate between the two is interposed between the layers. Fusion with the second component can also be achieved. Examples of such a polymer include an acrylic thermoplastic resin and nylon.

The composite plastic deformation product used for the shape holder 4 basically has an orifice for extruding the first component,
The first component and the second component are respectively extruded using a die having an orifice for extruding the second component, and the two components are stretched in a core-sheath state to impart plastic deformability. The cross-sectional shape of the composite stretched product is not particularly limited, such as a circle, a rectangle, and a combination of a circle and a rectangle. In addition, the first component and the second component of the composite stretched product only need to be combined at least with each other, and the entire component does not necessarily have to have a core-sheath configuration. When the cross-sectional shape of the composite stretched product has a core-sheath structure, the second component may cover at least 50% or more of the surface of the first component as the core material, and the ratio is appropriately determined according to the purpose of use. .

As shown in FIGS. 7 and 8, the plastic deformability of the composite stretched product is evaluated by the bending return angle θ after 10 minutes when the composite stretched product is bent at 180 degrees and 90 degrees. I do. The composite plastically deformed product is provided on condition that the bending return angle θ of the composite stretched product is 20 degrees or less. Therefore, the composite stretched product having a bending return angle θ of more than 20 degrees does not have sufficient plastic deformability, in other words, sufficient free shape retention, so that it does not become a composite plastic deformable product and has a shape retainer. Cannot be used as 4.

Next, the method for producing a composite plastically deformed product is as follows: a first component, which is polyethylene or a mixture of the polyethylene and another polyolefin, is melted and extruded from one orifice. Is melted and extruded from the other orifice to combine the first component and the second component into a composite unstretched product, and the composite unstretched product is subjected to 7 to It is stretched 16 times to give plastic deformability to give a composite stretched product. The plastic deformability of the composite stretched product is set at a return angle of 20 degrees when the composite stretched product is bent by 180 degrees and 90 degrees.
Given below.

That is, the composite plastically deformed product is, for example,
It is manufactured by a manufacturing apparatus as shown in FIG. This manufacturing apparatus includes an extruder 21 for extruding a first component and a second component.
A stretching device 23 for stretching the composite unstretched material 22 composed of the first component and the second component extruded and combined to impart plastic deformation, an annealing device 24 for further annealing the composite stretched material, and manufacturing And a take-up device 26 that winds up the composite plastically deformed product 25 thus obtained.

The extruder 21 is provided with a cooling tank 27 for cooling a plurality of unstretched molten thermoplastic resins to obtain a composite unstretched product 22 in parallel with two screw-type extruders 28. A die 29 connected to the two extruders 28 via an adapter includes an orifice for extruding the first component and forming a core, and an orifice for extruding the second component and forming a sheath. A conjugate die that has a second component that continuously coats the first component to obtain a composite unstretched product 22 is used. The stretching device 23 has a first heating tank 31 for heating the composite unstretched material 22 and a stretching machine 32 for stretching after the take-up device 30 for taking the composite unstretched material 22. The annealing device 24 includes a second heating tank 33 for further heating the composite stretched product and an annealing machine 34 for performing an annealing process.

Then, the composite plastically deformed product 25 is manufactured by the above-described manufacturing apparatus as follows. One extruder 28 extrudes the first component in the heated and molten state from one orifice of the conjugate die 29, and the other extruder 28 extrudes the second component in the heated and molten state from the other orifice of the die 29, Make both components sheath-core type,
It is cooled in a cooling tank 27 to form a composite unstretched product 22. The composite unstretched material 22 is taken out by the take-off machine 30 of the stretching device 23 and sent to the first heating tank 31.
Is heated to 60 to 120 ° C. and stretched 7 to 16 times by adjusting the speed of the stretching machine 32 to obtain a composite stretched product.
Further, the composite stretched product is sent to the second heating tank 33 of the annealing device 24, the composite stretched product is heated to 60 to 120 ° C., and an annealing process is performed by adjusting the speed of the annealing machine 34 to form the composite plastic deformed product 25. obtain. The composite unstretched material 22
May be divided into two stages. At this time, the ratio of the first stage stretching ratio to the second stage stretching ratio was 1st stage: 2nd stage = 7.
It is good to set from 5:25 to 95: 5.

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
It should be noted that these examples are for describing a preferred embodiment of the present invention, and the present invention is not limited thereto.

Example 1 (1) The first component was high-density polyethylene (manufactured by Tonen Chemical Co., Ltd.)
Polyethylene, MFR 0.5), and the second component is EE
A thermoplastic resin (A7 manufactured by Mitsui Dupont Polychemicals, Inc.)
12, MFR 8). (2) The first component is extruded from one of the orifices of the conjugate die by a mild compression type screw extruder having a diameter of 55 mm and an L / D of 26 to form a core. The second component is extruded from the other orifice of the conjugate die by a 40 mmφ, L / D 24 moderate compression screw extruder to form a sheath. (3) The set temperatures of both extruders are C ₁ -190 ° C, C _2-
230 ° C., C ₃ -270 ° C., AD-280 ° C., and the set temperature of the dice were 280 ° C. (4) The extrusion rate is 21 kg / hour for the first component and 9 kg / hour for the second component. (5) The first component and the second component extruded from the conjugate die are taken as a composite undrawn yarn at a speed of 5.9 m / min through a cooling bath containing ethylene glycol at 70 ° C., and 98 After being drawn 13 times by a drawing device at 13 ° C. to form a composite drawn yarn, the yarn is further reduced to 3% by an annealing device at 98 ° C.
% Annealed to obtain a 3000d composite plastically deformed yarn.

Example 2 The extrusion amount was 24 kg for the first component.
/ H, the second component was 6 kg / h, and a composite plastically deformed yarn was obtained under the same conditions as in Example 1 except for this.

Example 3 The extrusion amount was 27 kg for the first component.
/ H, the second component was 3 kg / h, and a composite plastically deformed yarn was obtained under the same conditions as in Example 1 except for this.

<Comparative Example> The extrusion amount of the first component was 30 kg /
A composite plastic deformed yarn was obtained under the same conditions as in Example 1 except that the time and the second component were 0 kg / hour.

With respect to the composite plastically deformed yarns obtained in Examples 1 to 3 and Comparative Example, tensile strength (g / d), elongation (%),
The 80-degree bending return angle, 90-degree bending return angle, 120 ° C. adhesive strength (kg), and 160 ° C. adhesive strength (kg) are measured. In addition, the adhesive strength is such that two monofilaments having a length of 10 cm are crossed at a right angle, and the entire surface is sealed with a film sealer through a Teflon film at a sealing temperature of 120 ° C. and 160 ° C., a sealing pressure of 2 kg / cm ² and a sealing time of 1 second. Is bonded (bonded) and then chucked at both ends with a tensile tester to measure (kg). Table 1 shows the measurement results.

[0042]

[Table 1]

Further, the composite plastically deformed yarns obtained in Examples 1 to 3 and Comparative Example were subjected to the above-mentioned 120 ° C.
After heating at 120 ° C. and 160 ° C. for 1 minute each as in the case of the adhesive strength at 0 ° C., the 180-degree bending return angle and the 90-degree bending return angle were measured. Table 2 shows the measurement results.

[0044]

[Table 2]

According to Tables 1 and 2, Examples 1 to 3
The 180-degree bending return angle and the 90-degree bending return angle hardly change before and after the heat treatment at 120 ° C. and 160 ° C. for 1 minute. On the other hand, in the comparative example, the adhesive did not adhere at 120 ° C., and the adhesive strength was weak at 160 ° C.
In addition, the 180-degree bending return angle and the 90-degree bending return angle before and after the heat treatment are not changed at 120 ° C. (but not bonded), but are 62 ° and 31 ° at 160 ° C.
To rise twice. Then, the composite plastically deformed yarns obtained in Examples 1 to 3 are attached to the bag-like material shown in FIGS. In addition, the closed state can be maintained, and after these bags are used, the composite plastically deformed yarn can be used as a binding device. Further, the composite plastically deformed yarn does not react to the metal detector, and hardly generates ash when incinerated.

[0046]

As described in detail above, according to the present invention,
The shape holder is deformed when necessary to maintain the open and closed state of the edge of the sheet or the opening of the bag, and the sheet and bag itself do not react to the magnetic detector or the metal detector A shape retainer is provided. Therefore, the sheet-like material can be stretched or folded again after use, and can be used again.The bag-like material can be charged smoothly, and after the content is charged, the bag-like material can be reused. The openings of the objects can be closed and closed, and can be discarded or incinerated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example in which a shape holder is attached to a part of an opening of a bag.

FIG. 2 is a perspective view showing an example in which a shape holding body is attached to a pocket portion of an apron.

FIG. 3 is a perspective view showing an example in which a shape holder is attached to an end of a bag-like material having both ends opened.

FIG. 4 is a perspective view showing an example in which a shape holder is attached to the entire periphery of the opening of the bag-shaped material.

FIG. 5 is a perspective view of a shape holding body showing an example in which a shape holding material is attached to a part of a bag-like material and its end is free.

FIG. 6 is a perspective view showing an example in which a shape retaining material is inserted into a folded portion at an edge of a sheet-like material.

FIG. 7 is a side view showing a method for measuring a 180-degree bent return angle of the shape holding material of the present invention.

FIG. 8 is a side view showing a method of measuring a 90-degree bent back angle of the shape holding material of the present invention.

FIG. 9 is a flowchart showing an apparatus for manufacturing a shape maintaining material of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Shape holder of a sheet-like material or bag-like material 2 Bag-like material 3 Opening 4 Shape holder 4a Extension piece 5 Sheet-like material 10 Apron 11 Pocket 11a Opening 12a Opening 12b Opening 12 Chute 21 Extrusion Apparatus 22 Composite unstretched material 23 Stretching device 24 Annealing device 25 Composite plastic deformed material 26 Winding machine 27 Cooling tank 28 Extruder 29 Die 30 Take-off machine 31 First heating tank 32 Stretching machine 33 Second heating tank 34 Annealing machine

Claims (5)

[Claims] 1. A plastically deformable linear and / or tape-like material made of a flammable thermoplastic resin is attached to at least a part of a sheet or bag-like material made of a flexible material. Shape holder. 2. The shape holder according to claim 1, wherein said sheet is an apron. 3. The thermoplastic resin having plastic deformability comprises a first component, which is polyethylene or a mixture of the polyethylene and another polyolefin, and a thermoplastic resin other than the first component as a substantially main component. The composite stretched product has a core-sheath structure in which the first component is a core material and the second component is a sheath material. The shape holder according to claim 1 or 2, wherein a return angle by bending at 180 and 90 degrees is 20 degrees or less. 4. The method according to claim 1, wherein the first component has an intrinsic viscosity [η] of 3.5.
4. The shape-retaining body of a sheet or bag according to claim 3, which is a high-density polyethylene of less than dl / g. 5. The first component as a core material, wherein the second component is made of a polymer having heat-fusibility with the first component.
5. The shape-retaining body of a sheet or a bag according to claim 3 or 4, which is configured to cover at least 50% of the surface of the component.