JPH057247B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention involves sequentially manufacturing bag sections on a bag material band made of flat tubes made of synthetic resin, sequentially introducing articles to be packaged into the bag material, and sequentially opening the openings. The present invention relates to a heat-sealing packaging method and apparatus.

(Prior Art and Problems) A packaging device using a packaging material band made of a flat tube made of synthetic resin, which has been commonly used in the past, is a packaging device made of a flat tube made of synthetic resin, as shown in FIGS. 6 and 7. A pair of clamping type packaging material strip conveying means 10 that intermittently transports the packaging material strip F in fixed size increments, and discontinuous cuts are made in the transverse direction of the packaging material strip F on the upstream side of this packaging material strip conveying means 10. It is equipped with a discontinuous cut means and a bottom heat sealing means 60 for heat sealing in the transverse direction, and holds the packaging material band F on the upstream side of the formed discontinuous cut, sandwiching the formed discontinuous cut, and presses the packaging material band F under the discontinuous cut. An opening means is provided for separating only the discontinuous cuts of the upper film among the discontinuous cuts by relatively moving only the upper film on the downstream side, and the opening means is provided on the downstream side of the packaging material strip conveying means. Equipped with a heat sealer for sealing the opening.

Therefore, the heat sealing method and apparatus are performed twice at two locations, one on the upstream side and one on the downstream side of the packaging material strip conveying means, which is uneconomical both in terms of the method and the apparatus.

(Problems to be Solved) The present invention is to eliminate the waste of the above-mentioned method and apparatus for performing similar heat sealing at two locations, and to perform heat sealing at one location. The main purpose is to provide equipment to the market.

(Means for Solving the Problems) The present invention sequentially molds bag portions from a synthetic resin packaging material band made of flat tubes, and sequentially feeds out the packaging materials with the bottom of the bag portion at the top. In the method of heat-sealing the opening of the bag section by sequentially introducing the items to be packaged into the bag section, the packaging material strip is intermittently transferred one bag at a time, and each time the packaging material strip is stopped, an irregularity is made in the transverse direction of the packaging material strip. Continuous cuts are made, and then, among these cuts, only the upper discontinuous cut is separated by the entire width of the packaging material band to form an opening, and the packaged item is placed in the bag portion at the beginning of the packaging material band. The problem was solved by using a packaging method that is characterized in that when the opening is heat-sealed after loading, the bottom portion of the bag adjacent to the opening is simultaneously heat-sealed. did.

Another invention provides a pair of clamping type packaging material belt conveying means for intermittently transporting a packaging material belt made of synthetic resin made of flat tubes in fixed size increments, and a packaging material belt conveying means provided on the upstream side of the packaging material belt conveying means. a discontinuous cut means for making discontinuous cuts in the transverse direction in the packaging material band every time the packaging material band is stopped; an opening means for separating only the discontinuous cuts in the upper inner film, and a welding device for heat-sealing the opening on the downstream side of the packaging material belt conveying means each time the packaging material belt conveying means stops. In the packaging device, the welding device includes a heat seal block equipped with a heat sealer for sealing the opening, and the heat seal block includes a heat sealer for heat sealing the bottom portion of the bag on the upstream side of the bag across the opening. The problem was solved by providing a packaging apparatus characterized in that a heat sealer for sealing the bottom is installed in parallel with a heat sealer for sealing the opening.

(Operation of the method invention) In this method invention having the above structure,
First, the above-mentioned packaging material strip is intermittently conveyed by a constant size, and at each stop, a discontinuous cut is made in the transverse direction by piercing it with, for example, a saw blade-shaped cutter, and at the same station or the next station, Only the upper films on the upstream and downstream sides across the discontinuous cuts are moved relatively in the length direction or the width direction of this packaging material band, and a pulling force is applied only to the discontinuous cuts in the upper film. A shearing force is applied to separate the films and create openings in sequence, so that transverse openings are formed at regular intervals in the upper film, and discontinuous cuts are made in the lower film at the same locations as the openings. A packaging material band is formed, and in this state, it is transported in the above-mentioned order.

When the packaging material strip is transported to the loading station with the items to be packaged, first, both sides of the opening at the top are heat-sealed in the transverse direction using a heat sealer to form a bottom heat-sealed part, and then the bottom heat-sealed portion is formed. Form a pouch. During the next intermittent transfer period, this packaging material strip is further conveyed by one bag length, the article to be packaged is put into the first bag section, and both sides of the opening of the bag section into which the article to be packaged has been placed are again moved as described above. The bag is heat-sealed using a heat sealer to close the opening of the bag into which the object to be packaged is placed, and to form a bottom heat-sealed part of the next bag.

This method is repeated thereafter.

(Effects of the method invention) In the method of the present invention configured as described above, discontinuous cuts are made in the packaging material band, and only the upper film is moved relatively on both sides of the discontinuous cuts. When cutting, the upper and lower films on either side are not heat-sealed, so they can move freely relative to the lower film. The movement dimension of the film on one side may be smaller than that applied to the tensile force or shearing force, and there is no risk of the film being wrinkled or breaking down to the discontinuous cuts on the lower side.

In addition, since the opening can be heat-sealed and the bottom of the upstream side of the bag can be heat-sealed at the same time, when configuring the equipment for carrying out this method, the equipment can be simplified and the thermal efficiency can be improved. Much better than doing it in each place separately!

(Function of the device invention) A synthetic resin packaging material strip made of a flat tube is intermittently conveyed one bag in size by a pair of clamping type packaging material belt conveying means that intermittently conveys the same size at a time. First, discontinuous cuts are sequentially made in the transverse direction of the packaging material strip using, for example, a saw blade-like cutter, by a discontinuous score means provided upstream of the packaging material strip conveying means.

Next, at the same station where the aforementioned discontinuous cut means is provided, or at a station downstream from this, the packaging material strip is cut on both sides of the discontinuous cut during each stop period of the packaging material strip conveying means. That is, on the upstream and downstream sides, the holding members of the opening means are used to press the holding members to the pedestal and move the holding members relatively away from each other or in different directions in the width direction along the pedestal surface. Only the film moves relatively across the discontinuous cut, and a tensile force or shearing force acts on the discontinuous cut, and the discontinuous cut only in the upper film is separated, forming an opening. Ru.

In this way, the tubes each having the length of one bag are sequentially connected at discontinuous cuts to form a packaging material band, and the leading end portion thereof is sent out to the discharge side, that is, the downstream side, of the packaging material band conveying means and hangs down. Usually, the first discontinuous cut stop position from the packaging material belt conveying means is a heat seal station, and this heat seal station is equipped with an opening sealing heat sealer and a bottom sealing heat sealer of a welding device that closes the opening in parallel. Each time the packaging material strip conveying means stops, the pair of heat-seal blocks are brought closer to each other, and both sides of the opening are sandwiched between the two heat sealers, and the film in these parts is heat-sealed.

When the bag portion whose bottom is formed with the bottom-sealing heat sealer is fed out one bag by the next feeding, the article to be packaged is thrown into the bag portion through this opening.

This operation is repeated thereafter.

(Effects of the Device Invention) In the device of the present invention constructed and operated as described above, in the opening forming means, the pressing member can be moved either on either side of the discontinuous cut or on both sides. , the degree of freedom in design is high, especially in the case where the holding members on both sides of the discontinuous cut are moved relatively, the actual movement dimension of the holding members may be about half of the movement on only one side of the discontinuous cut. , it is mechanically reasonable and operates smoothly.

Furthermore, there are few dimensions that would distort the film when it is opened, and there is no risk of wrinkling the film or breaking up discontinuous cuts in the lower film.

In addition, the welding device has a common pair of heat sealer blocks that are equipped with a heat sealer for sealing the opening and a heat sealer for the bottom sealer, so the structure is simple and the mechanical operating mechanism and electrical control device can be integrated into one set. This simplifies the structure, reduces heat loss, and simplifies the overall structure of the packaging device, resulting in cost reduction.

(Embodiments) Representative embodiments of the apparatus invention for carrying out the method invention of this application will now be described in detail.

In the figure, F is a packaging material band made of synthetic resin made of a flat tube, and 10 is a pair of clamping type packaging material belt conveying means for intermittently transporting the packaging material belt F by a fixed size. Consists of intermittent transfer rollers. A packaging material belt F is placed on the upstream side of this packaging material belt conveying means 10 every time this means 10 is stopped.
A discontinuous cut means 11 is provided for making a discontinuous cut C in the transverse direction, and this discontinuous cut means 11
The cutter 12 is made up of a saw blade-shaped cutter 12, presser members 13 on both sides thereof, support members 14, and an operating mechanism for vertically moving the support members 14.

In the drawing, an opening means 15 is provided at the same station as the discontinuous cut means 11 or a station downstream from this station, and the opening means 15 is provided at the downstream side of the second or third station. A flat pedestal 16 for receiving F and the packaging material strip conveying means 10 descend from above every time they are stopped, and press both sides of the discontinuous cut C on this pedestal 16 to hold it against the surface of the bag material strip F. It consists of a pair of swing-type presser members 17 that move relatively apart in the direction along the axis, then approach each other again and rise, and an operating mechanism thereof. The direction in which the pair of swing-type press members 17 move after pressing the packaging material band F may be either the transport direction of the packaging material belt F or a direction perpendicular thereto, but in the illustrated example, it is the transport direction.

Next, this opening means 15 will be specifically explained based on FIG. 4.

A second support member 18 that descends and rises from an upper standby position every time the packaging conveyance means 10 stops.
The swing type presser member 17 presses the packaging material band 1 against the
The second support member 1 is pivotably supported on a horizontal axis 19 in the transverse direction of the second support member 1 and is normally supported resiliently (e.g. by a spring 20) in close proximity to each other.
When the lower ends of the swing-type presser members 17 are brought into pressure contact with the surface of the pedestal 16 due to the lowering of the swing-type presser members 8, the contact pressure causes the pair of swing-type presser members 17 to respond to the elastic force of the spring 20. They are provided so as to be opposite to each other in the upstream and downstream directions.

This swing type presser member 17 is shown as an example in which a pair of members are provided that are separated from each other in the upstream and downstream directions, but only one of them is a swing type presser member, and the other is a fixed type presser member ( (similar to that shown in FIG. 7) is also the same for this invention.

Further, the welding means 30 is provided on the downstream side of the packaging material strip conveying means 10, and this welding means 30 connects a pair of heat seal blocks which are brought into pressure contact with each other from a state of separation each time the packaging material strip conveying means 10 is stopped. 31a, 31b, and an operating mechanism for operating the heat seal blocks 31a, 31b, and further includes an opening sealing heat sealer for heat sealing both sides of the opening to at least one pressure contact surface of the heat seal blocks 31a, 31b. 32 and a bottom-sealing heat sealer 33 are provided in parallel, and an electric control device is provided for heating each heat sealer 32 and 33 during pressure contact.

The passage of the packaging material strip F between the aforementioned discontinuous slit means 11, opening means 15, and welding means 30 is provided by a fixed guide roller 40 and a movable and fixable dancer roller 41, respectively. The passage lengths of the packaging material bands F can be adjusted independently.

In addition, 50 is an original fabric support device, and 51 is a blower.

Each of the above-mentioned operating mechanisms uses a conventionally known pure mechanical mechanism such as a cam, a lever, etc., or a combination of an air cylinder device, etc., and repeatedly operates these mechanisms for each cycle.

(Operation of the embodiment) First, the packaging material strip F made of flat tubes is sequentially passed from the original fabric support device 50 through the discontinuous cutting means 11, the opening means 15, the packaging material strip conveying means 10, and the welding means 30, and each dancer roller 41, the passage length of each packaging material strip conveying means 10 is adjusted to correspond to the dimensions of each bag portion B.

When the packaging material belt conveying means 10 is driven intermittently at a constant rotation angle, the packaging material belt F is intermittently transported at a constant rotation angle, and each time the packaging material belt F is stopped, the discontinuous cut means 11, the opening means 15, and the welding means 30 are moved. operates at each station.

That is, in the discontinuous cut means 11, the support part 14
is lowered from the upper standby position and first the packaging material band F
The packaging material band F is held down by the pressing member 13 at narrow intervals in the transverse direction of A cut 11 is provided in the packaging material band F, and the presser member 13 and saw blade-shaped cutter 12 return to the standby position together with the support portion 14.

In addition, in the station where the opening means 15 is provided, the swing-type presser members 17 together with the second support member 18 begin to descend from their standby positions, and the lower ends of the pair of swing-type pressers 17 are placed on the pedestal 16. When the second support member 18 further approaches the pedestal 16, the pair of swing-type press members 17 separate from each other while holding the packaging material band F. , the discontinuous cuts C in the upper film of the packaging material band F are separated by the pulling force, and an opening P of the bag is formed.

Thus, the second support member 18 rises to the standby position together with the swing-type presser member 17.

In this state, the packaging material strip F passes through the packaging material strip conveying means 10 and is suspended downstream of the packaging material strip conveying means 10.

At the position of the station where the welding means 30 is provided (same as the station for introducing the packaged items), the pair of heat seal blocks 31a and 31b are separated from each other across the opening P of the sent-out packaging material band F. The upper and lower parts of the opening P are sandwiched between the bottom sealing heat sealer 33 and the opening sealing heat sealer 32, and the bag material band F in these parts is heat-sealed to seal the opening _S1 and the opening P. Form the bottom seal _S2 . On the downstream side of this part, a package B ₁ enclosing the object to be packaged is formed similarly to a known packaging device, and this package B ₁
A bag portion B is formed one bag upstream of the bag.

As mentioned above, in this embodiment as well. The method of this invention can be implemented.

(Effects of the Embodiment) In this embodiment constructed and operated as described above, in addition to achieving the same effects as those of the device of the present invention described above, There is nothing to heat, simplifying these devices. Further, since the opening means 15 also moves the bag material band F in the upstream and downstream directions simultaneously by the swinging type presser member 17, one of the swinging type presser members 17
Since the movement dimension is small, there is no risk of the bag material band F being wrinkled or broken.

[Brief explanation of drawings]

The figure shows something related to this invention,
Fig. 1 is a mechanical diagram of the principle of the device invention, Fig. 2 is a perspective view of the bag material band showing the process, and Fig. 3 is a perspective view of the bag material band with both sides of the opening portion heat-sealed.
FIG. 4 is a partially longitudinal side view of the opening of the opening means, FIG. 5 is an enlarged partially longitudinal side view of the welding means during heat sealing, and FIGS. 6 and 7 are bags of known packaging devices. FIG. 3 is a mechanical side view of a portion forming portion and an opening forming device. Main symbols in the figure: 10...Packaging material belt conveying means;
11...Discontinuous cutting means, 12...Saw blade, 13...
... Pressing member, 15 ... Opening means, 30 ... Welding means, 31a, 31b ... Heat seal block,
32...Heat sealer for sealing openings, 33...
Heat sealer for bottom sealing.

Claims (1)

[Scope of Claims] 1. Bag portions are sequentially formed from a synthetic resin packaging material band made of flat tubes, and the packaging material is sequentially fed out with the bottom of the bag portion at the top, and the packaged material is placed in the top bag portion. In the method of heat-sealing the opening of the bag by sequentially introducing items, the packaging material strip is intermittently transferred one bag at a time, and discontinuous cuts are made in the transverse direction of the packaging material strip each time the material is stopped. Then, among these cuts, only the discontinuous cut on the upper side is separated by the entire width of the packaging material band, and an opening is provided, and after putting the packaged item into the bag portion at the beginning of the packaging material band, A packaging method characterized in that when heat-sealing an opening, a bottom portion of the bag on the upstream side adjacent to the opening is simultaneously heat-sealed. 2. A pair of clamping type packaging material belt conveying means for intermittently transporting a synthetic resin packaging material belt made of flat tubes in fixed size increments; a discontinuous cut means for making discontinuous cuts in the transverse direction in the packaging material strip; and a discontinuous cut means for making discontinuous cuts in the transverse direction, and moving only the upper film relatively across the formed discontinuous cuts, A packaging device comprising an opening means for separating only discontinuous cuts in the film, and a welding device disposed downstream of the packaging material strip conveying means for heat-sealing the opening each time the packaging material strip conveying means is stopped. In the above, the welding device includes a heat seal block equipped with a heat sealer for sealing the opening, and the heat seal block includes a bottom seal for heat sealing the bottom of the bag on the upstream side of the bag across the opening. A packaging apparatus characterized in that a heat sealer for sealing an opening is installed in parallel with the heat sealer for sealing an opening.