Method for producing package

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Industrial application field]

The present invention relates to a method for producing a package in which a composition containing magnetic powder (hereinafter referred to as a magnetic powder-containing composition) is stored in a bag, and more specifically, packaging using magnetic force and attractive force. The present invention relates to a method for producing a body, for example, a heating element that generates heat in the presence of air, and a bag-shaped oxygen scavenger.

【0002】

[Conventional technology]

Typical examples of the magnetic powder-containing composition include a composition composed of a metal powder, water, a water retention agent and an oxidation accelerator, and this composition utilizes the reaction between the magnetic powder and oxygen to generate an exothermic agent. It is also used as an oxygen scavenger. In recent years, an exothermic body in which an exothermic agent is stored in a breathable bag has become widespread as a disposable bag.

【0003】

As a method for producing a heating element using magnetic force, the method described in JP-A-4-2342 is known. That is, this known method is based on a magnetic force transfer method performed using two magnet sheets, in which a heating agent is attached to one magnet sheet and the adhered material is attached to another magnet sheet on which a packaging material is arranged. This is a method for manufacturing a heating element that magnetically transfers and holds it on the surface of a packaging material, and then covers and seals another packaging material.

【0004】

PROBLEM TO BE SOLVED: To solve a problem of the present invention.

However, in this known method, when another packaging material is covered and sealed during high-speed production, the packaging material is unstable and the packaging material meanders, or the formed sealing portion is wrinkled. Is likely to occur, so there is a problem with the stability of high-speed operation.

【0005】

[Means for solving problems]

As a result of diligent studies to solve the above problems, the present inventors, etc., when coating the magnetic powder-containing composition with two packaging materials and sealing both packaging materials to manufacture a packaging body, when sealing. We have found that a package can be manufactured at high speed and stably by utilizing magnetic force and attractive force, and have reached the present invention.

【0006】

That is, according to the present invention, in a method for producing a package in which a magnetic powder-containing composition is stored in a bag composed of two packaging materials (a) and (b), the composition is held by a magnet on the surface of the packaging material (a). The magnetic powder-containing composition was magnetically transferred to the packaging material (b), and the magnetic powder-containing composition coated with the packaging material (a) was placed on the surface of the packaging material (b), and then the packaging material (b) was placed. A method for producing a package, which comprises sealing both packaging materials (a) and (b) while attracting and holding the magnetic powder-containing composition on the surface of the packaging material (b) with a magnet. It is to provide.

【0007】

Of the device used to hold the magnetic powder-containing composition on the surface of the packaging material (a) with a magnet (hereinafter referred to as the holding device (A)) and the packaging material (b) in which the magnetic powder-containing composition is attracted. As a device used to hold the surface with a magnet (hereinafter referred to as a holding device (B)), in order to enable high-speed production of the package, a magnet having a suction port is placed on the entire peripheral surface. A rotating structure is preferable, which is arranged at predetermined intervals and has a suction chamber (that is, a decompression chamber) that can communicate with the suction port. As a more preferable device, recesses may be provided on the entire peripheral surface at predetermined intervals, a magnet may be provided at the bottom or below the bottom of the recess, or the bottom of the recess itself may be a magnet, and may communicate with the recess or the suction port provided in the magnet. An example is a rotating structure in which a suction chamber is installed. When the latter rotating structure is used, a concave portion is formed in the packaging material at the recess, so that the composition containing magnetic powder in the sealing portion in the packaging material sealing step of the packaging material manufacturing is compared with the former rotating structure. Biting is reduced, and the sealed state of the sealed portion is improved. Since the degree of depression of the recessed portion can be adjusted by suction force, a desired packaging bag can be used by using a method of supplying the two packaging materials to the holding device (A) and the holding device (B), respectively. The degree of bending of each packaging material can be adjusted according to the shape, and the seal state becomes even better.

【0008】

The holding device (A) has a mechanism capable of making the magnetic force of the holding device (A) larger than the magnetic force of the magnetic powder-containing composition supply device at least in a portion in contact with the magnetic powder-containing composition supply device described later. It is preferable to have a mechanism for reducing, extinguishing, or shielding the magnetic force and / or the attractive force at the portion in contact with the holding device (B).

【0009】

Further, the holding device (B) has a magnetic force and / or an attractive force of the holding device (B) larger than the magnetic force and / or the attractive force of the holding device (A) at least in the portion in contact with the holding device (A). A mechanism for obtaining and a mechanism for reducing or extinguishing the magnetic force and / or attractive force after manufacturing the package or a mechanism for applying pressure to the package in order to easily separate the manufactured package from this device. It is preferable to have.

【0010】

The increase, decrease or disappearance of the magnetic force can be increased by using an electromagnet that can change the magnetic force as a magnet, or by providing a fixed magnetic force shielding curved plate or magnetic force shielding plate inside or outside of these devices to shield the magnetic force. Easily achieved.

【0011】

The decrease or disappearance of the suction force or the pressurization of the package is achieved by providing a non-suction chamber (normal pressure chamber or pressurization chamber) together with the suction chamber.

【0012】

In holding the magnetic powder-containing composition on the surface of the packaging material (a), the magnetic powder-containing composition is usually supplied from the magnetic powder-containing composition supply device to the surface of the packaging material (a) and placed on the surface.

【0013】

As the magnetic powder-containing composition supply device, a powder supply machine is preferably provided inside the vicinity of the discharge port, preferably a hopper provided with a sensor for detecting the accumulated amount in the hopper, a rotating structure provided with a magnet, and the entire circumference. A rotating structure in which magnets are provided at predetermined intervals on the surface, a rotating structure in which recesses are provided at predetermined intervals on the entire peripheral surface, magnets are provided at the bottom or below the bottom of the recess, or the bottom of the recess itself is a magnet. A combination of these can be mentioned.

【0014】

The powder feeder in the hopper should have a structure that can prevent changes in the physical properties of the magnetic powder-containing composition as much as possible and supply the powder smoothly. For example, a rotary valve that relaxes the load of the magnetic powder-containing composition and transfers it in a fixed amount. As a preferable mechanism of the hopper part, a rotary valve as a powder feeder and a sensor for detecting the accumulated amount in the hopper are provided inside near the discharge port, and the rotary is provided by the signal of the sensor. -There is a structure that controls the rotational movement of the valve, maintains the magnetic powder-containing composition in an appropriate state, and discharges the composition.

【0015】

The magnetic powder-containing composition supply device composed of these rotating structures is magnetic at least in a portion in contact with the holding device (A) in order to reliably supply a predetermined amount of the magnetic powder-containing composition to the packaging material (A). It is preferable to have a mechanism for reducing, extinguishing, or shielding the magnetic force of the powder-containing composition supply device.

【0016】

The decrease or disappearance of the magnetic force may be achieved by using an electromagnet capable of changing the magnetic force as a magnet, or by providing a magnetic force shielding curved plate or a magnetic force shielding plate inside or outside of these devices to shield the magnetic force. Magnet.

【0017】

The rotating structures of the magnetic powder-containing composition supply device and the holding devices (A) and (B) described above may be belt-shaped rotating structures, but it is easy to provide a magnet, a suction chamber, or a magnetic force shielding curved plate. Usually, a drum-shaped rotating structure is preferably used for this purpose. The magnets used in the magnetic powder-containing composition supply device and the holding devices (A) and (B) can be either electromagnets or permanent magnets.

【0018】

Further, the recesses, magnets and suction chambers provided in these rotating structures are not particularly limited in shape or structure. If necessary, a pressing roller, a scraper, and / or a cleaning roller for cleaning the concave portion or the sealing surface of the packaging material may be attached to the magnetic powder-containing composition supply device or the holding device.

【0019】

As a method of sealing both packaging materials (a) and (b), a method of heat-sealing, a method of using an adhesive using a non-breathable packaging material provided with an adhesive layer on the inner surface, or a combination of both. There are several methods.

【0020】

The seals of the packaging materials (a) and (b) are usually performed by the protruding surfaces of the holding device (B) and the seal dial adjacent to the holding device (B), but the holding device (A) and the holding device are sealed. It is also possible to carry out by each protruding surface of (B). In either case, the holding device (B) is provided with a heating means inside, but in the latter case, the holding device (A) is also provided with a heating means inside. Any of these heating means can be applied, such as electric heating, steam heating, and solvent heating.

【0021】

Next, the magnetic powder-containing composition of the present invention includes (a) magnetic metal powder such as iron powder, (b) water, (c) oxidation aid such as metal halide or sulfate, and (d) wood powder. , Hilstone, activated charcoal, water-absorbent polymer and other water-retaining agents as the main components, and in these components (a) to (d), inorganic salts as hydrogen generation inhibitors, binders as compounding aids- Alternatively, a composition to which a surfactant or the like as an impregnation aid is added can be mentioned. Preferably, a composition consisting of at least iron powder, water, a metal halide salt and activated carbon is used as an exothermic agent or an oxygen scavenger.

【0022】

When the magnetic powder-containing composition is an exothermic agent or an oxygen scavenger, the two packaging materials coated and sealed to form a packaging material are selected from non-breathable packaging materials and breathable packaging materials, but at least one. The sheet consists of breathable packaging material.

【0023】

Breathable packaging materials are non-woven fabrics, porous sheets (trade name NF sheet (manufactured by Tokuyama Soda), trade name Serpore (manufactured by Sekisui Chemical), trade name Breslon (manufactured by Nitto Denko), etc.) or porous. Laminated sheet of sheets and non-woven fabric, breathable sheet made by laminating polyethylene fibers and heating and pressurizing (trade name: Tyvek (manufactured by DuPont)), laminated plastic film on non-woven fabric A laminated sheet mechanically perforated with a blade or the like, or a non-woven fabric or a porous sheet laminated with a plastic film having vent holes in advance is applied.

【0024】

The non-breathable packaging material may be a conventional composite packaging material whose inner surface is made of a polyethylene film or the like, but when the packaging material is a heating element, the adhesive for holding the heating element attached to the outer surface of the packaging material. Those provided with an agent layer and a release packaging material are preferably used.

【0025】

[Example]

Next, a preferred embodiment of the method of the present invention will be described with reference to a case where an exothermic agent is used as the magnetic powder-containing composition. FIG. 1 shows a nitrogen-sealable hopper 2 and a drum-shaped rotating structure F4 as a magnetic powder-containing composition supply device in the production method of the present invention, and a drum-shaped rotating structure A5 and a holding device as a holding device (A). It is a schematic cross-sectional view which shows the manufacturing method of the heating element when the drum-shaped rotating structure B6 is used as (B).

【0026】

A rotary valve 3 is provided inside the vicinity of the discharge port of the hopper-2. The drum-shaped rotating structure F4 has a plurality of recesses 7 adapted to the shape of the heating element at predetermined intervals on the entire peripheral surface, and a magnet 9 (permanent magnet) is provided below the bottom of the recesses 7, and the drum-shaped rotating structure is further rotated. It is a rotating structure in which a fixed magnetic shield curved plate 10 is internally installed at a position in front of the rotation close to the structure A5. A rotating brush 12 for cleaning the surface of the drum-shaped rotating structure F4 after supplying the magnetic powder-containing composition was attached to the outside.

【0027】

The drum-shaped rotating structure A5 has a plurality of recesses 7 that adapt to the shape of the heating element at predetermined intervals on the entire peripheral surface, and a magnet 9 (permanent magnet) and a suction port 17 are provided at the bottom of the recess 7 and fixed. The suction chamber 16 and the non-suction chamber 18 are provided internally, and the recess 7 is a rotating structure that rotates in contact with the suction chamber 16 and the non-suction chamber 18. Therefore, when the drum-shaped rotating structure A5 rotates, the suction port 17 communicates with either the suction chamber 16 or the non-suction chamber 18 depending on the rotation position. A vacuum cleaning roller-13 for cleaning the seal surface of the packaging material (a) was attached to the outside.

【0028】

The drum-shaped rotating structure B6 has a structure similar to that of the drum-shaped rotating structure A except that the packaging material can be heat-sealed on the surface of the protrusion forming the recess 7. That is, it has a heating means inside.

【0029】

The drum-shaped rotating structure F4 and the drum-shaped rotating structure A5 are adjacent to each other, and the drum-shaped rotating structure B6 and the drum-shaped rotating structure A5 are adjacent to each other. Then, the drum-shaped rotating structures adjacent to each other rotate so that the protrusions on the peripheral surfaces face each other.

【0030】

First, a predetermined amount of exothermic agent 1 is supplied from the hopper 2 to the recess 7 of the drum-shaped rotating structure F4 that rotates clockwise, and the surface of the exothermic agent 1 held by the magnet 9 is prepared by the scraper-11.

【0031】

On the other hand, the drum-shaped rotating structure A5 and the drum-shaped rotating structure B6 are counterclockwise while forming the recessed portion 8 in the packaging material a14 and the packaging material b15 supplied to the respective recesses 7 by the suction action of the suction chamber 16. Rotate clockwise and clockwise.

【0032】

At the portion where the drum-shaped rotating structure F4 is in contact with the drum-shaped rotating structure A5, the heating agent 1 held by the recess 7 of the drum-shaped rotating structure F4 reaches the magnetically shielded curved plate 10 and is demagnetized to form a drum-shaped rotating structure. It is transferred to the recessed portion 8 of the packaging material a14 by the magnet 9 of the body A5 and held in a desired shape, and the seal surface of the packaging material a is rotated while being cleaned by the vacuum cleaning roller-13.

【0033】

The surface of the drum-shaped rotating structure F4 after transferring the exothermic agent is cleaned by the rotating brush 12.

【0034】

At the portion where the drum-shaped rotating structure A5 is in contact with the drum-shaped rotating structure B6, the packaging material a14 and the heating agent 1 held by the recess 7 of the drum-shaped rotating structure A5 are brought to reach the non-suction chamber 18, and the drum-shaped rotating structure is formed. The heating element sheet 22 is manufactured by transferring it to the recessed portion 8 of the packaging material b15 by the magnet 9 of the body B6 and holding it in a desired shape, and sealing both packaging materials by the seal die roll 19. Then, the heating element sheet reaches the non-suction chamber 18 and is separated from the drum-shaped rotating structure B6, and then is cut by the cut roller 20 to obtain the separated heating element 23. The separated heating element 23 is transferred using a perforated transfer belt (with a built-in suction device) 21.

【0035】

A cut roller may be adjacent to the drum-shaped rotating structure B6 in order to immediately cut the manufactured heating element sheet to obtain a separated heating element.

【0036】

[Effect of the invention]

According to the production method of the present invention, the former packaging material is attracted when sealing the packaging material on which the magnetic powder-containing composition held by a magnet is placed and the packaging material coated with the composition. Therefore, even under the condition of high-speed production, it is possible to prevent the meandering of the packaging material and the occurrence of wrinkles in the sealing part in the sealing process, the operation is stable, the defective product rate is drastically reduced, and labor saving is possible. In comparison, the productivity of the package is improved.

[Simple explanation of drawings]

[Figure 1]

It is a schematic sectional drawing which shows the Example of the manufacturing method of this invention.

[Explanation of symbols]

1 exothermic agent 2 hopper 3 Rotary valve 4 Drum-shaped rotating structure F 5 Drum-shaped rotating structure A 6 Drum-shaped rotating structure B 7 Recess 8 Recessed part 9 magnet 10 Magnetic force shielding curved board 11 Scraper 12 rotating brush 13 Vacuum cleaning roller 14 Packaging material a 15 Packaging material b 16 Suction room 17 Suction port 18 Non-suction room 19 Seal die roll 20 cut roller 21 Perforated transfer belt 22 Heating element sheet 23 Heating element