JP2010254327A - Sealing/packaging apparatus, sealing/packaging method and package of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing/packaging apparatus and sealing/packaging method which contribute for waste reduction and improve the appearance of a product. <P>SOLUTION: The sealing/packaging apparatus includes a base sheet placement portion 2 where a roughly flat plate base sheet a for placing an object W to be packaged thereon is placed, a film roll arranging portion 4 for feeding a film for covering the object W on the sheet (a), film feed means 7 for pulling out the film from a film roll 12 arranged on the film roll arranging portion and for extensively holding the film above the portion 4, moving means for relatively moving the film feed means or the base sheet placement portion for the film to cover the object on the sheet, and sealing means for heat welding the edge of the film covering the object and the surface of the sheet where the object is placed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sealed packaging in which a film is placed on an object to be packaged placed on a base material, and the edge of the film is sealed on the surface of the base material for packaging.

  The product is stored in a container (tray) in which a recess for storing the product is formed, and a film is placed on the surface of the recess of the container, and the periphery of the film is thermally welded to a flange portion formed around the recess and sealed. Various top-seal packaging devices have been developed and proposed (see, for example, Patent Document 1).

This top-seal type packaging is substantially less in the amount of film to be used than the overlap type packaging method in which the packaged object and the entire tray are covered with a film, and the end of the film is folded into the bottom side of the tray for packaging. There is an advantage that it can be halved.
However, since the container (tray) used in the top-seal type packaging is a container in which a recess is formed, when the container is discarded after the product is taken out and used, the bulk increases and the amount of garbage is reduced. There is a problem of not being able to contribute.

In addition, since the product is put into the recess, in the case of an unstable product, when the product is put into the container, the product hits the edge of the container and the shape collapses. There's a problem.
Moreover, in the said container, a flange part protrudes horizontally in the upper end part periphery of a recessed part, and a film is heat-welded on the flange part surface. For this reason, the inner part (periphery of the opening of the recess) of the film to be heat-welded becomes opaque due to the heat of the heat-welding, and it is difficult to see the item at the opaque part when the item is viewed obliquely from above. There is a problem.
When the items sealed and packaged as described above are displayed on a display stand such as a supermarket, it is difficult to see the items and it is difficult for the customer to select the item.

  Also, as a method of packaging without using a container (tray) to reduce the amount of garbage, a base material is put in a plastic bag, and a piece of meat or a block is placed on the base material. A method of sealing the opening with a sealer has been adopted in part. However, in this case, since the merchandise is only put in the bag, the merchandise does not look good, and there is a problem that the willingness to purchase is reduced. Furthermore, when packaging in a back yard of a supermarket, since a base material and goods are put from the opening part of a plastic bag, it has the problem that it is difficult to work and it is inferior to productivity.

JP 2001-294210 A

  The present invention has been made in view of the above-described problems of the prior art, and provides a seal packaging apparatus, a seal packaging method, and a packaging body that can contribute to the reduction of waste and can package products with good appearance. For the purpose.

In order to achieve the above object, the sealed packaging apparatus of the present invention comprises a base material placing portion for placing a substantially flat base material for placing an article to be packaged, and a film to be placed on the article to be packaged on the base material. A film roll arrangement section that feeds out, a film feed means that draws out the film from the film roll arranged in the film roll arrangement section, and stretches and holds the film above the base material placing section, and the film that is to be wrapped on the base material A moving means for relatively moving the film feed means or the base material placing portion so as to cover, and a sealing means for thermally welding the edge of the film covering the article to be packaged to the surface of the foundation material on which the article is packaged. (1).
The base material is made of paper, resin (for example, resin sheet, foamed resin sheet, resin plate, etc.), thin wooden board, laminated sheet with different materials bonded together, etc. In some cases, surface treatment (resin lamination, coating treatment, etc.) that enables thermal welding is performed. The surface of the base material may be plain (white), but the product may be conspicuous by using a colored or printed pattern according to the product to be placed.

The film covering the surface of the packaged object is not limited to a stretch film, and may be a film having no elasticity (for example, a polypropylene film). In that case, in order to eliminate the slack of the film, a folding plate for folding the slack inward may be provided, and after removing the slack, heat welding may be performed.
The film feed means grips the leading end of the film connected to the film roll arranged in the film roll arrangement part and pulls it out for a predetermined length, and stretches and holds the drawn film above the base material placing part. May be any of a system in which a member for gripping the leading edge of the film is moved, a system in which both sides of the film in the width direction are sandwiched by upper and lower belts that rotate endlessly, and the film is pulled out by driving the belt.

  In order to cover the film on the base material placed on the base material placing portion, the film feed means or the base material placement portion is moved by the moving means in order to cover the film stretched and held by the film feed means. Is appropriately selected depending on the member to be moved, and may be either manual or electric. For example, in the case of a system in which the film feed means is moved up and down with respect to the base material placing portion, any one of up-and-down rotation around one end of the film feed means or up-and-down parallel movement in a horizontal state may be used.

  The sealing means heat-welds the edge of the film covering the package to the surface of the base material, and the form of the seal is basically a form in which the four sides are sealed along the outer shape (for example, a rectangle) of the base material. However, depending on the object to be packaged, only two sides facing each other or only three sides may be sealed.

  According to the above means, a flat base material on which an article to be packaged is placed is placed on the base material mounting portion, and the film feed means is operated to pull out and hold the film from the film roll. By moving the placing portion relatively, the object to be packaged on the base material can be covered with a film, and the edge of the film outside the object to be packaged can be thermally welded to the surface of the base material. That is, the object to be packaged can be stably held on the base material by covering the object to be packaged placed on the flat base material with a film and thermally welding the periphery of the film to the surface of the base material. And since the to-be packaged object covered with a film protrudes upwards from the seal | sticker part (base material) surface, it becomes easy to see a to-be packaged object (product). Moreover, since the base material which mounts a to-be-packaged object is flat form, it can contribute largely to weight reduction compared with the container (tray) provided with the recessed part.

For example, in the case of a system in which the film feed means is a system in which a film leading end connected to a film roll is gripped by a clamp member, and the clamp member that grips the film is moved in the film feeding direction to pull out the film, A film tip clamp portion that slides back and forth along the film, and the clamp portion is opened by the forward movement (advance) of the clamp portion to a position where the film tip waits, and the film tip clamps. The film is drawn out by backward movement (backward movement) (claim 2).
Specifically, for example, one of the upper and lower members (lower member) constituting the clamp portion is automatically opened and closed in conjunction with the forward movement of the film tip clamp portion, and the film tip is attached by the upper and lower members.
The operation of sliding the film leading end clamp portion along the film drawing direction may be either a manual method or an automatic method using a motor or a cylinder.

  According to the above means, the film front end clamping part can be clamped and pulled out and expanded only by reciprocating to the position where the film front end waits.

In addition, the film feed means includes a holding portion that holds both side edges in the width direction of the film drawn out from the film roll.
Both side edges in the width direction of the film on which the holding portion is attached are left and right edges parallel to the drawing direction of the drawn film.
The holding section that holds the both side edges of the drawn film in the width direction is a mechanism for attaching the film in conjunction with the lowering of the film feed means, or the film is attached independently without being linked to the lowering of the film feed means. Any mechanism may be used. In short, it is only necessary that the film holding and holding of the film, that is, the stretching and holding of the film, be completed before the edge of the film is thermally welded to the surface of the base material.

  According to the above means, the side edge in the width direction of the film drawn out by the film feed means is also attached by the holding portion, so that the film can be covered with the package in a state where the four sides of the film are stretched. Is possible.

Further, the sealing means is composed of a heating element arranged in the film feed means and a receiving part arranged corresponding to the base material placing part side (Claim 4).
Moreover, as a heat generating body (heater) which comprises a sealing means, a nichrome wire (resistance wire) is common, for example. Further, as the receiving part, an elastic body having heat resistance is suitable.
The heating element and the receiving portion constituting the sealing means may be fixed and fixed, respectively, but at least one of them may be configured to be elastically movable (Claim 5). For example, the receiving part disposed on the base material placing part side is biased upward by a spring member, and the peripheral part of the base material placed on the base material placing part and the film covering the part are elastic to the heating element. To be pressed.

  According to the said means, the edge of the film covered on the to-be-packaged object can be reliably heat-welded to the surface of a base material. And when one of the heating element or the receiving part is configured to be elastically movable in the sealing direction (vertical direction), the base material or film is not crimped more than necessary. It can be neatly sealed with no damage.

  Further, the sealing means is disposed inside a holding portion provided in the film feed means (Claim 6). Then, the film attachment position by the holding part is positioned below the base material placing part on which the base material is placed (Claim 7).

  According to the above means, since the film to be wrapped is stretched and held by the holding portion arranged outside the sealing means (heating element), the thermal welding of the film to the surface of the base material by the sealing means is in the stretched state. The film and the base material can be reliably sealed. In addition, since the position where the film is attached by the holding portion is located below the base material placement portion, the film can be pressed against the surface of the base material in a tensioned state, and the film can be surely thermally welded to the base material. it can.

  In addition, the film used for sealing packaging may be a non-stretchable film. However, when a stretch film with stretchability is used (Claim 8), the film placed on the package is evacuated. In addition, since the film is closely adhered and packaged according to the form of the object to be packaged placed on the base material, the film does not sag and can be packaged with a simple appearance.

The sealed packaging method according to the present invention is a sealed packaging method in which an article to be packaged is placed on a substantially flat base material, the article to be packaged is covered with a film, and the periphery of the film is thermally welded to the surface of the base material. A process for placing an object to be packaged on a substantially flat base material, a film feed process for pulling the film from the film roll and stretching it above the base material, and a state in which the object on the base material is stretched A covering step of covering with a film, and a sealing step of heat-sealing the edge of the film covered on the package to the surface of the base material (claim 9).
In the covering step, the stretched and held film is moved with respect to the base material on which the package is placed, or the base material on which the package is placed is moved from below to cover the stretched and held film. .

  The package used in the seal wrapping apparatus covers a substantially flat base material and an object to be packaged placed on the base material, and an edge portion extending outward from the object to be packaged is the base material. It consists of a film thermally welded to the material surface (Claim 10).

According to the seal packaging apparatus of the present invention, the object to be packaged is covered with the film by the structure according to claim 1 and the periphery of the film is thermally welded to the surface of the substrate. Can be stably held on top. And since the to-be-packaged object covered with a film protrudes upwards from the seal | sticker part (base material) surface, it becomes easy to see a to-be-packaged object. Moreover, since the base material which mounts a to-be-packaged object is flat form, it can contribute largely to weight reduction compared with the container (tray) provided with the recessed part.
Further, according to the configuration of the second aspect, the film leading end can be reliably clamped and pulled out only by reciprocating the film leading end clamping portion to the position where the leading end of the film waits.
Furthermore, since the side edge in the width direction of the drawn-out film can be attached by the configuration according to the third aspect, the film can be covered with the package in a state where the four sides of the film are stretched.

Further, according to the configuration of the fourth aspect, the peripheral edge of the film placed on the package can be reliably heat-welded to the surface of the base material.
Furthermore, since the base material and film are not crimped more than necessary, the base material and film are not damaged and can be sealed and packaged neatly.
Further, according to the structure of the sixth aspect, the film can be thermally welded to the surface of the base material by the sealing means under a stretched state, and the film and the base material can be reliably sealed.
According to the seventh aspect of the present invention, a strong tension can be applied to the film sandwiched between the sealing means, so that the sealing performance by heat welding is more reliably performed.
Further, according to the configuration of claim 8, since the film is closely attached and packaged according to the form of the object to be packaged placed on the base material without using a vacuum device or the like, the film is not slack and looks good. Good packaging can be realized with a simple configuration.
Furthermore, the structure of Claim 9 can provide the packaging method which can be packaged with a good appearance by placing an article to be packaged on a flat base material.
And the structure of Claim 10 can provide the package which contributes to the reduction | decrease of garbage and the good product display of appearance.

The perspective view which shows an example of embodiment of the seal packaging apparatus which concerns on this invention, and shows the state before pulling out a film. The same perspective view which shows the state which covers the to-be-packaged object with the drawn-out film, and is sealed. The top view of the state shown in FIG. The side view which shows the state which covers the to-be-packaged object on a base material mounting part with the film pulled out by the film feed means. The same side view of the state shown in FIG. The relative relationship of a base material mounting part and the frame provided with the sealing means and the holding | maintenance part is shown, (a) is a top view, (b) is a longitudinal cross-sectional view. FIG. 6 shows a film tip clamping operation by a film tip clamp portion of the film feed means, where (a) shows a state where the movable lower plate is opened, and (b) shows a case where the film tip is attached by closing the fixed upper plate and the movable lower plate. State, (c) is the state where the film is pulled out. The cutter means which cut | disconnects a film is shown, (a) is a top view, (b) is a vertical side view. It is explanatory drawing which shows the process of sealing packaging, (a) is a base material, (b) is a figure which shows the state which mounted the to-be-packaged material on the base material, (c) is a film to cover a to-be-packaged object, and covers a periphery. The figure which shows the state heat-welded to the material.

Hereinafter, an example of an embodiment of a sealed packaging device according to the present invention will be described with reference to the drawings.
The seal wrapping apparatus A shown in FIGS. 1 to 3 places an article W to be packaged on a flat base material, covers the article W with a stretch film, and covers the outer edge of the film W from the article W. 1 shows a manual seal wrapping apparatus in which a film to be wrapped on an object W is drawn and sealed up and down by a manual operation by means of heat welding on the surface of the material.
In the seal wrapping apparatus A, the base material placing portion 2 is horizontally supported at a predetermined height position by a pair of support legs 36 on the base 1, and further, the side of the base material placing portion 2 (right side in the drawing). A pair of mounting plates 3 are fixed upright in parallel at a predetermined interval, a film roll disposing portion 4 is provided between the mounting plates 3 and 3, a holding portion 6 that stretches and holds the film below, and a film feed A frame body 5 provided with a film tip clamp portion 8 of the means 7 and a heating element (heater) of the sealing means 9 is attached to the base material mounting portion 2 so as to be rotatable up and down.

The base material placing portion 2 is formed in a rectangular shape in plan view using a metal plate or the like, and a peripheral frame 2a having a predetermined width for supporting and supporting the outer periphery of the base material a is supported by a spring so as to be elastically movable up and down. Yes. A heater receiving portion 9b corresponding to the heating element 9a of the sealing means 9 is attached to the peripheral frame 2a.
The heater receiving portion 9b is made of an elastic body having heat resistance, such as a rubber material, and can elastically support a film and a base material that are press-contacted via a heating element.
In addition, the base material placing portion 2 is provided with a partition frame 39 inside the depth direction so that two kinds of base materials a having different sizes can be placed, and the peripheral frame is formed above the partition frame 39 in the same manner as described above. 2a is supported so that it can be raised and lowered, and a heater receiving portion 9b is attached to the peripheral frame 2a.

The film roll arrangement portion 4 includes two rotating rollers 11a and 11b rotatably mounted on a support 10a installed between a pair of mounting plates 3 and 3 which are fixed upright on the base 1, and the mounting plate 3 The film roll 12 is mounted so as to be capable of rolling by a total of four rotation rollers 11a to 11d, which are rotation rollers 11c and 11d respectively attached to the supports 10b and 10c attached to each other.
The supports 10b and 10c, to which the rotating rollers 11c and 11d for supporting and supporting the rear side of the film roll 12 are attached, are inclined and attached in the direction in which the distance from the support 10a is increased. Thereby, the film 12a drawn from the film roll 12 acts so as to be separated from the outer peripheral surface of the film roll 12, and the film roll 12 is prevented from laterally moving in the axial direction, and always rolls at a predetermined position. It is configured. In addition, the support structure of the film roll in the film roll arrangement | positioning part 4 is not restricted to the four-point support structure by rotation roller 11a-11d, The general support structure supported through a shaft in the center hole of the film roll 12 may be sufficient.

Further, as shown in FIG. 4, between the mounting plates 3, 3, one side rear portion of the frame body 5 that is positioned below the film roll placement portion 4 and has a substantially rectangular shape in plan view is rotated up and down by a shaft 13. The balance weight 14 is connected and fixed at a position behind the shaft support portion of the shaft 13 in the frame 5, and one end 15 a of the gas spring 15 is connected to the left and right connection portions of the balance weight 14. The other end 15b of the gas spring 15 is connected to the upper portion of the mounting plate 3 by a shaft 15c.
The balance weight 14 and the gas spring 15 are in a state in which the front part of the frame 5 (the front part from the shaft 13) is opened with respect to the base material placing part 2 (a state in which the base material and the packaged article are placed on the base material placing part) ) And the frame 5 is rotated downward about the shaft 13, the elastic force of the balance weight 14 and the gas spring 15 becomes resistance, and the frame 5 is closed (lowered). There is no impact.

As shown in FIG. 3, a guide roller 16 for guiding the film 12a connected to the film roll 12 in the pulling direction is attached to the shaft 13 via a one-way clutch (not shown). That is, the guide roller 16 rotates together with the rotation of the shaft 13 in the clockwise direction, and the one-way clutch is disconnected and does not rotate with respect to the rotation of the shaft 13 in the counterclockwise direction.
Further, as shown in FIG. 4, toothed pulleys 18 and 19 are fixed to the shaft end of the shaft 13 and the shaft end of a shaft 17 that is rotatably mounted on the rear portion (near side) of the frame body 5, respectively. The toothed belt 20 is wound around the toothed pulleys 18 and 19, and the shaft 13 is rotated by the movement of the toothed belt 20. The toothed belt 20 is connected to a film front end clamp portion 8 which will be described later, and the guide roller 16 is driven to rotate when the film front end clamp portion 8 moves back along the frame body 5. .

The frame body 5 is formed in a substantially rectangular shape in plan view using a metal strip, and a film support plate 21 that horizontally supports the front end of the film 12a guides the frame body 5 below the shaft 13. It is attached substantially horizontally via the plate 22.
The film support plate 21 is formed in a substantially comb-like shape in plan view using a thin metal plate, the base side is fixed to the guide plate 22, and the distal end side (comb-shaped side) faces forward from the guide plate 22. It protrudes horizontally. Thereby, the front end side of the film support plate 21 protruding from the guide plate 22 is freely bent in the vertical direction, and the film front end clamping by the film front end clamp portion 8 of the film feed means 7 is surely performed.

The film feed means 7 for clamping (clamping) the front end of the film 12a supported horizontally on the upper surface of the film support plate 21 and pulling out the film 12a along the lower surface of the frame 5 holds the film 12a. The front end clamp unit 8 and a drive unit 23 that reciprocates the film front end clamp unit 8 along the frame 5 are configured.
As shown in FIG. 7, the film front end clamp portion 8 has a movable lower plate 8b pivotally supported by a shaft 24 on the lower side of the fixed upper plate 8a. The spring 25 is elastically mounted over the movable lower plate 8b. Thereby, the front end side of the movable lower plate 8b is pressed against the lower surface of the fixed upper plate 8a so that the film 12a can be attached. Then, an elastic body (for example, urethane foam) 26 is bonded and fixed to the upper surface of the movable lower plate 8b so that the film can be more securely attached by the fixed upper plate 8a and the movable lower plate 8b. The elastic body 26 is attached over the entire width of the movable lower plate 8b so that the entire width of the film 12a can be attached.

A guide roller for forcibly opening the movable lower plate 8b closed by the elastic force of the spring 25 is provided on the side surface of the movable lower plate 8b on the front end side (the side to which the elastic body 26 is attached). 27 is attached. And the guide inclination board 28 which guides this guide roller 27 below with respect to a horizontal line is arrange | positioned at the side surface of the frame 5 in which the front-end | tip vicinity of the said film support plate 21 is located.
This inclined guide plate 28 moves the movable lower plate 8b which is moved forward along the frame body so that the film leading end clamping portion 8 clamps the leading end of the film 12a, and is closed at a position before the end of the moving forward. It is forcibly opened against the elastic force of 25, and is disposed forward and downward at a position in front of the horizontal line on the line through which the guide roller 27 attached to the outer surface of the movable lower plate 8b in the closed state passes. When the guide roller 27 comes into contact with the guide inclined plate 28 and continues to advance, the leading end side (the side on which the film is attached) of the movable lower plate 8b is moved downward about the shaft 24 and the film support plate 21 is moved downward. The lower part of the film 12a and the film support plate 21 are closed by the elastic force of the spring 25 after passing through the guide inclined plate 28 and the fixed upper plate 8a located above the film support plate 21. Wear .
As shown in FIG. 7, the tilted state of the guide inclined plate 28 is fixed in the direction in which the guide roller 27 abuts forward, and the guide roller 27 is guided along the lower surface of the guide inclined plate 28 and passes ( When the film front end clamp portion 8 is switched back (retracted) and passes the upper surface side of the guide inclined plate 28, the inclined plate 28 faces downward so as not to obstruct the movement of the guide roller 27. In addition, the spring 41 of the tension coil spring is attached so that the inclined guide inclined plate 28 returns to the initial state (the inclined state in which the guide roller 27 is guided downward in the traveling direction) after passing through the guide roller 27. Being pulled by

As shown in FIG. 4, the drive unit 23 for reciprocating the film front end clamp unit 8 along the frame 5 includes a guide shaft 23a disposed from the front end to the rear end on the left and right side surfaces of the frame 5, The sliding body 23b is slidably attached to the guide shaft 23a, and the handle 23c is attached to the left and right sliding bodies 23b. The sliding body 23 is an endlessly rotating tooth disposed on the side surface of the frame body 5. It is connected to the lower side (return path side) of the attached belt 20. Then, both side portions of the fixed upper plate 8a of the film leading end clamp portion 8 are connected and fixed to the left and right sliding bodies 23b.
Accordingly, the sliding body 23b slides along the guide shaft 23a by pushing or pulling it with the handle 23c, and the film end clamp portion 8 connected to the sliding body 23b slides along the frame body 5. . During forward movement (forward movement), the leading edge of the film 12a is clamped by opening / closing operation of the film leading edge clamp section 8, and during backward movement (retraction), the film leading edge clamp section 8 moves backward while holding the leading edge of the film 12a. The amount of film required for packaging can be withdrawn.
The starting position of the sliding body 23b to which the film leading end clamp portion 8 is connected is configured by attaching a stopper 35 to the frame body 5, and the sliding body is further equipped with a magnet (not shown). 23b can be adsorbed and held at the starting position. Further, when the film leading end clamp unit 8 is moved backward by operating the driving unit 23, the pulling-out length of the film can be adjusted by stopping the backward movement at a position before the stopper 35.

Both side edges in the width direction (left and right side edges parallel to the drawing-out direction of the drawn film) of the film 12a having a predetermined length drawn out by the action of the film front end clamping part 8 are provided on the lower surface of the frame 5 by the holding part 6. The extension is held.
As shown in FIG. 6, the holding portion 6 presses and holds the film 12 a against the lower surface of the frame body 5 that supports the upper surface side of the film 12 a, and is positioned on the outer side in the width direction of the frame body 5. An attachment arm 6a attached to the shaft 13 so as to swing up and down, a base plate 6b attached horizontally to the lower surface of the attachment arm 6a, and a position corresponding to the lower surface of the side of the frame 5 on the upper surface of the base plate 6b. The elastic body 6c is fixed.

As shown in FIG. 4, the mounting arm 6 a is urged by a spring 29 in a direction in which the mounting arm 6 a comes into pressure contact with the moving down frame 5. The holding portion 6 is attached to the attachment arm 6a in order to stand by and hold at a slightly lower initial position (inclined upward) with respect to the initial position of the frame 5 (a position away from the base material placing portion). One side portion (the side opposite to the side on which the base plate 6 b is attached) is in contact with a stopper 30 disposed on the base 1.
Thereby, the film 12a pulled out along the lower surface of the frame body 5 by the film feed means 7 is moved down with the frame body 5 about the shaft 13, and the lower surface of the frame body 5 stands by at the initial position. The width direction side part of the film 12a is attached by the frame 5 and the holding part 6 by contacting the elastic body 6c via the film 12a. When the lowering operation of the frame body 5 further proceeds, the elastic body 6c that supports the lower side of the film 12a is biased to the lower surface side of the frame body 5 by the spring 29 via the mounting arm 6a. Combined with the lowering, the side edges in the width direction of the film 12 a are firmly attached and held, and the film 12 a is stretched and held on the lower surface of the frame 5.
The end point of the lowering operation of the frame 5 is a position where the mounting arm 6a of the holding part 6 is substantially horizontal, and the horizontal film attachment position is from the surface on which the base material a of the base material placing part 2 is placed. The lower position is set (see FIG. 6B).

Further, the frame body 5 has the periphery of the base material a and the film 12a covered on the package W placed on the base material a along the rotation of the frame body 5 along the outer peripheral edge of the surface of the base material a. A heating element (heater) 9a of the sealing means 9 for heat welding is disposed.
A heating element (heater) 9a of the sealing means 9 is a resistance wire such as a nichrome wire, and is disposed inward in the horizontal direction and vertically upward from the film attachment position by the holding portion 6 as shown in FIG. And is arranged and configured so as to correspond to the heater receiving portion 9b provided in the base material placing portion 2. The upper surface of the heating element (heater) 9a (the surface opposite to the surface in contact with the film) is covered with a heat insulating material 40, and safety measures are taken to prevent burns or the like even if fingers are accidentally contacted. Yes.
Further, the heating element (heater) 9a of the sealing means 9 is arranged so that the four sides of the base material a having a substantially rectangular shape in plan view can be heat-welded, but the heating element (heater) 9a corresponding to each side is independent. When it is divided, the corners where the sides intersect are not thermally welded. In order to eliminate the non-welding of the corner portions, the end portions of the heating elements may be connected to each other with a metal conductor so that the corner portions are also thermally welded.

  Further, in the heating element (heater) 9a of the sealing means 9, the heating element (heater) 9a that thermally welds the near side in the depth direction of the base material a placed on the base material placing portion 2 is the size of the base material a. Corresponding to (depth direction), it can be moved and adjusted in the front-rear direction. As the moving mechanism, for example, ball screw mechanisms 31 are arranged on both sides in the width direction of the frame 5, and the left and right ball screw mechanisms 31 are connected by a belt 32 to be operated synchronously.

Further, as shown in FIG. 4, a cutter 33 is disposed on the frame body 5 so as to be vertically movable with the film support plate 21 positioned at the front upper side.
The cutter 33 cuts the film 12a that is covered with the package W and is thermally welded to the periphery of the base material a at a position outside the seal position in the depth direction, and the operation unit 34 is connected to the cutter 33, and The cutter 33 is elastically biased upward by a spring 37 away from the film 12a.

The base material a used for the seal packaging is a flat paper base material, a resin base material (for example, a film base material, a foamed resin base material, etc.), a thin wooden base material, or a laminated base material bonded with different materials. Any material, such as a material, may be used, and a surface treatment (resin laminating, coating treatment, etc.) that enables heat welding is applied to a material that is difficult to heat-weld the film. In this surface treatment, the melting point is preferably slightly lower than that of the film 12a, and the central portion may not be subjected to the surface treatment. That is, the surface treatment may not be performed on the portion where the article W is placed. The surface of the base material may be plain (white), but the product may be conspicuous by using a colored or printed pattern according to the product to be placed.
The upper surface of the base material a may be somewhat uneven. For example, a protrusion is provided at a position on the upper surface of the base material a corresponding to the heating element (heater) 9a of the sealing means 9, and the protrusion and the heating element (heater) 9a are in contact with each other with the film 12a interposed therebetween. You may make it improve the sealing performance (thermal welding) of 12a.

Next, the packaging operation of the seal packaging apparatus will be described.
(1) In a state where the frame body 5 is in the initial position and the film front end clamp portion 8 of the film feed means 7 is positioned at the starting position of the frame body 5 (position where the sliding body comes into contact with the stopper 35). The base material a is placed on the placing portion 2, and the article W to be packaged is placed on the foundation material a (the article placement work) (see FIGS. 1 and 9B).
(2) The film leading end clamping portion 8 of the film feeding means 7 is moved forward (advanced) from the starting position toward the leading end side of the frame 5 with the handle 23c of the driving portion 23. The guide roller 27 mounted on the film front end clamp unit 8 at the position before the end point is guided downward by the guide inclined plate 28 attached to the frame body 5 side, and the movable lower plate 8b is opened relative to the fixed upper plate 8a. The fixed upper plate 8a is positioned above the film 12a supported on the film support plate 21, and the movable lower plate 8b is positioned below the film support plate 21 (see FIG. 7A).
(3) When the guide roller 27 of the film leading end clamp portion 8 passes under the guide inclined plate 28, the movable lower plate 8b is closed by the elastic force of the spring 25, and the leading end of the film 12a and the film support plate 21 The front part is attached by the fixed upper plate 8a and the movable lower plate 8b. At this time, since the elastic body 26 is attached to the upper surface of the movable lower plate 8b, the elastic body 26 bites into the comb teeth of the film support plate 21 and securely attaches the film 12a (see FIG. 7B). ).
(4) The film front end clamp portion 8 with the front portion of the film 12a and the front portion of the film support plate 21 attached is moved back (retracted) to the front side position of the frame 5 with the handle 23c (see FIG. 4). ). The backward movement (backward movement) of the film tip clamp part 8 is carried out by sliding only the film 12 a and sliding the film roll 12 supported by the film roll arrangement part 4 to remove the film 12 a from the film roll 12. Pull out. When the film leading end clamp portion 8 is moved backward (retracted), the guide roller 27 causes the guide inclined plate 28 to fall in a substantially horizontal state and passes through the upper surface. After the guide roller 27 passes through the upper surface, the inclined guide inclined plate 28 is returned to the initial state inclined by the tension force of the spring 41 (see FIG. 7C).

(5) The film end clamp portion 8 is moved back (retracted) to the initial position and the film 12a is pulled out along the lower surface of the frame 5, and then the frame 5 is pushed downward by the handle 23c (moving means). . As a result, the frame 5 rotates downward about the shaft 13, and the elastic body 6c attached to the upper surface of the base plate 6b of the holding portion 6 is elastically pressed against the lower surface of the frame 5 in the middle of the lowering. Both side edges in the width direction of 12a are attached and held, and the film 12a is stretched and held on the lower surface of the frame body 5.
(6) The frame 5 holding the film 12a is lowered, and the film 12a is placed on the base material a placed on the base material placing portion 2 and the article W to be packaged on the base material a (covering step). Further, the frame body 5 continues to descend, and the heating element (heater) of the sealing means 9 is pressed against the surface of the film 12a covering the periphery of the base material a placed on the base material placing portion 2. At this time, since the holding portion 6 that attaches the side edge in the width direction of the film 12a is positioned below the surface of the base material mounting portion 2 of the base material mounting portion 2, the film 12a is sealed (heated) to the base material a in a tensioned state. (Welding) 38 (sealing step) (see FIGS. 2, 5, and 6B).
(7) After sealing the film 12a on the periphery of the base material a, the operation part 34 of the cutter 33 is pushed downward to cut the film 12a (see FIG. 8B). The leading end of the film 12a connected to the film roll 12 is supported in a horizontal state by the film support plate 21 and waits for the next packaging.
(8) Finally, the adhesion of the leading end of the film 12a by the film leading end clamping unit 8 is released, and the packaged object (see FIG. 9C) that has completed sealing packaging is removed from the base material placing unit 2. Clamp release of the film front end clamp portion 8 is performed by applying the spring 25 on the opposite side (rear end side) of the movable lower plate 8b that is closed by the elastic force of the spring 25 on the opposite side (rear end side). Closing against the force opens the attachment side and releases the clamped state.
In this way, by using a stretch film, the film is tightly packed according to the form of the packaged object W, so that the film does not sag without using a vacuum device or the like, and has a good appearance. Can be realized with a simple configuration.

The seal packaging apparatus of the present invention is not limited to the illustrated embodiment, and can be appropriately changed without departing from the gist of the present invention.
(1) In the embodiment, the film feed means is moved in the vertical direction with respect to the fixed base material placing portion in order to cover the base material placed on the base material placing portion and the article to be packaged. The film feed means that stretches and holds the film is fixed, and the base material and the base material placing portion on which the packaged material is placed are moved from the lower side of the film to be packaged, or the two are relatively moved to be packaged. . The relative movement of the film feed means and the base material placing portion is not limited to the manual type, but may be an automatic type using a motor, a hydraulic / pneumatic actuator, or the like.
(2) In the embodiment, the four-point support for the support structure of the film roll in the film roll arrangement portion has been described. However, a general support structure that supports the shaft through the center hole of the film roll may be used.
(3) In the embodiment, a method of attaching and pulling out the leading end portion of the film as the film feeding means has been shown. For example, a belt that attaches and feeds out both end portions in the width direction of the film with an endlessly rotating belt. An anchoring method may be used.
(4) In the embodiment, the configuration has been described in which the film tip clamp portion of the film feed means is manually slid to clamp the film and pull out the film. You may automate using.
(5) In the embodiment, the configuration in which the clamps on both side edges in the width direction of the film pulled out by the film feed means (film front end clamp part) are performed in the middle of the descending operation of the frame body is shown. The film may be clamped immediately after, in short, when the film is placed on the package W, both side edges in the width direction of the film (left and right side edges parallel to the drawing direction of the drawn film) are also clamped and stretched. Just do it.
(6) In the embodiment, a cutter is provided to separate the sealed and packaged product from the film connected to the film roll, and the film is cut. At the same time, the film is thermally welded to the periphery of the base material. Any of a so-called fusing and cutting method for cutting, or a method in which the film is thermally welded to the base material and the cutter is lowered and cut at the same time may be used.
(7) In the embodiment, the example in which the four sides of the film are thermally bonded to the base material in a substantially rectangular shape in plan view is shown. However, depending on the package, only two opposite sides are sealed and the package is grounded. You may make it fix to a material.
(8) In the embodiment, the example using the stretch film has been described, but a film other than the stretch film may be used. In the case of a film that does not expand and contract, a film that is as large as the package to be placed on the base material is used. However, in order to absorb the loose film, for example, a film is placed beside the package W. A film folding means for folding in the center direction of the base material may be provided, and the base material and the film may be thermally welded after the film is folded.

DESCRIPTION OF SYMBOLS A ... Seal packaging apparatus W ... To-be packaged object a ... Base material 2 ... Base material mounting part 4 ... Film roll arrangement | positioning part 5 ... Frame body 6 ... Holding part 7 ... Film feed means 8 ... Film front end clamp part 9 ... Sealing means 9a ... heating element (heater) 9b ... heater receiving part 12 ... film roll 12a ... film

Claims (10)

A base material mounting part for mounting a substantially flat base material for mounting an object to be packaged;
A film roll arrangement section for feeding out a film to be covered on an object to be packaged on the base material;
A film feed means for pulling out the film from the film roll arranged in the film roll arrangement part and stretching and holding the film above the base material placing part,
Moving means for relatively moving the film feed means or the base material placing portion so that the film covers the package on the base material;
Sealing means for thermally welding the edge of the film covering the packaged object to the surface of the base material on which the packaged object is placed;
A seal packaging apparatus comprising:   The film feed means includes a film tip clamp portion that slides back and forth in the direction of drawing out the film, and the clamp portion is opened by the forward movement of the clamp portion to a position where the film tip waits, thereby pinching the film tip. The sealed packaging apparatus according to claim 1, wherein the film is pulled out by the backward movement of the film tip clamp portion.   The sealed packaging apparatus according to claim 2, wherein the film feed means includes a holding portion that holds the both side edges of the film drawn from the film roll in a clamped manner.   3. The sealed packaging apparatus according to claim 2, wherein the sealing means includes a heating element arranged in the film feed means and a receiving part arranged corresponding to the base material placing part side.   5. The seal packaging apparatus according to claim 4, wherein at least one of the heating element and the receiving portion of the sealing means is elastically movable.   The sealed packaging apparatus according to any one of claims 3 to 5, wherein the sealing means is disposed on an inner side of a holding portion provided in the film feed means.   The sealed packaging apparatus according to any one of claims 3 to 6, wherein a film attachment position by the holding part is located below a base material placing part on which the base material is placed.   The sealed packaging apparatus according to claim 1, wherein the film is a stretch film. A sealed wrapping method in which an object to be packaged is placed on a substantially flat base material, the object to be wrapped is covered with a film, and the periphery of the film is thermally welded to the surface of the base material,
To-be-packaged object placing step for placing an article to be packaged on a flat base material,
A film feed process in which the film is pulled out of the film roll and stretched and held above the base material;
A covering step of covering the packaged material on the base material with a stretched film;
A sealing step in which the edge of the film covered on the package is thermally welded to the surface of the base material;
A sealed packaging method comprising:   It consists of a substantially flat base material and a film that covers an object to be packaged placed on the base material and has an edge portion extending outward from the object to be thermally welded to the surface of the base material. A package characterized by.

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