JPH01182208A - Packing method and apparatus - Google Patents

Abstract

PURPOSE:To carry out heat-sealing at one point instead of the same heat-sealing at two points in order to avoid useless methods and apparatus by closing the opening of a bag and at the same time forming the heat-seal bottom of the next bag which is charged with an article to be packed during an intermittent transfer interval. CONSTITUTION:A packing material F between fixing members 13 is pierced to provide perforations by a saw-toothed cutter 12. The second bearing member 18 of an opening means 15 approaches a receiving bed 16, a pair of swing type fixing members 17 depart from each other, keeping hold the packing material F. The packing material is broken at the perforations C due to the above tension to form a bag opening P. Next, the upper and lower parts of the opening P are held by a heat-sealer 33 for bottom seal and a heat-sealer 32 for opening seal to form an opening seal S1 and a bottom seal S2 by heat-sealing the packing material F for these parts. In the down-stream of this part, packed articles are formed and in the up-stream by one bag prior to the above packed article, bags are formed.

Description

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

(Prior Art and Problems) A packaging device that uses a packaging material band made of flat tubes made of synthetic resin, which has been commonly used in the past, uses plastic tubes made of synthetic resin made of flat tubes, as shown in FIGS. 6 and 7. A pair of clamping type packaging material belt conveying means 10 that intermittently transports the packaging material belt F in fixed size increments, and this packaging material belt conveying means 10
The packaging material band F is provided with a discontinuous cut means for making discontinuous cuts in the transverse direction on the upstream side of the packaging material band F, and a bottom heat sealing means 60 for heat sealing in the transverse direction, and the formed discontinuities Holding the packaging material band F on the upstream side of the cut, and relatively moving only the upper film on the downstream side of the discontinuous cut, the discontinuous cut of the upper film among the discontinuous cuts is made. The packaging material is provided with an opening means for separating the packaging material strip, and an opening sealing heat sealer for heat sealing the opening on the downstream side of the packaging material strip conveying means.

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

(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) This invention forms bag portions sequentially 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, and the bag at the top of the bag is sequentially fed out. 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. Drill continuous cuts,
Next, among these cuts, only the upper discontinuous cut is separated by the entire width of the packaging material band, and an opening is provided, and after putting the article to be packaged into the bag portion at the beginning of the packaging material band, the opening is opened. The problem was solved by using a packaging method that simultaneously heat-seals the bottom portion of the bag on the upstream side adjacent to the opening when heat-sealing.

Another invention provides a pair of clamping type packaging material strip conveying means for intermittently conveying a synthetic resin packaging material strip made of a flat tube in fixed size increments, and a packaging material strip conveying means provided on the upstream side of the packaging material strip conveying means. discontinuous cut means for punching discontinuous cuts in the transverse direction in the packaging material strip each time the packaging material strip is stopped; an opening means for separating only the discontinuous cuts in the film on the white clay side, and a welding device for heat-sealing the openings 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 plotter is equipped with a heat seal block that holds the opening and heat seals the bottom of the bag on the upstream side of the bag. The problem was solved by providing a packaging device characterized in that a heat sealer for sealing the bottom is installed in parallel with a heat sealer for sealing the opening.

(Function of the method invention) In this method invention, which has a structure like an upward slope, first, the above-mentioned packaging material strip is conveyed intermittently by a constant size, and each time it is stopped, a discontinuous cut is made in the transverse direction by, for example, a saw blade. At the same station or at the next station, only the upper films on the upstream and downstream sides of the packaging material strip are cut relative to each other in the length or width direction of the packaging material strip. and applying tensile force or shearing force only to the discontinuous cuts in the upper film,
This is separated and openings are sequentially formed, and openings in the transverse direction are formed at regular intervals in the upper film, and discontinuous cuts are formed in the lower film at the same locations as the openings in the packaging material strip. In this state, the above-mentioned sequential transfer is carried out.

After the packaging material strip is transported to the loading station with the items to be packaged, first, both sides of the opening at the front are heat-sealed in the transverse direction using a heat sealer to form a bottom heat-sealed portion, and a bag portion is placed at the beginning of the packaging material strip. form. 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 the 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, which is configured in a diagonal manner, 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 you let
Since the upper and lower films on either side are not heat-sealed, they can move freely relative to the lower film, so only one film can be moved significantly.
The movement dimension of the film on one side may be smaller than that which applies tensile force or shear force to the discontinuous cut, and there is no risk of the film being wrinkled or breaking down to the discontinuous cut below.

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. It's 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 at a time by a pair of sandwiching type packaging material belt conveying means that intermittently conveys one bag at a time. First, discontinuous cuts are made in the transverse direction of the packaging material strip one after another, for example by a saw blade-like cutter, by a discontinuous score means provided upstream of the strip conveying means.

Next, at the same station as the station at which the discontinuous cut means is provided, or at a station downstream from this, the packaging material strip is moved 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 receiver is held down on the stand by the holding members of the opening means separately, and the holding members are moved relatively apart or in different directions in the width direction along the stand surface, and the above-mentioned upper side Only the film moves relatively between the discontinuous cuts, and a tensile force or shearing force acts on the discontinuous cuts,
The discontinuous cuts in only the upper film are separated to form openings.

In this way, the bag-length tubes are successively connected in discontinuous cuts to form a packaging material band, the leading end of which 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 at this heat seal station position, an opening sealing heat sealer and a bottom sealing heat sealer of a welding device that closes the opening are placed in parallel. A pair of equipped heat seal blocks are brought close to each other each time the packaging material belt conveying means stops,
Both sides of the opening are sandwiched between the two heat sealers, and these portions of the film are heat-sealed.

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

This operation is repeated thereafter.

(Effects of the Device Invention) In the device of the present invention, which is constructed and operates in an upwardly inclined manner, in the opening forming means, the pressing member can be moved selectively or both on either side of the discontinuous cut. , 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.

Additionally, there are fewer dimensions that would distort the film upon opening, and there is no risk of wrinkling the film or breaking up discontinuous cuts in the underlying film.

In addition, the welding device has a common pair of heat sealer blocks with a heat sealer for sealing the opening and a 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. The overall structure of the packaging equipment is much simpler, with less heat loss and
Cost can be reduced.

(Example) A representative example 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 1o 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 discontinuous cut means 11 is provided on the upstream side of this packaging material strip conveying means 10, for making a discontinuous cut C in the packaging material strip F in the transverse direction every time this means 10 is stopped, and this discontinuous cut means 11
has a saw blade-shaped cutter 12 and holding members 13 on both sides thereof.
, these support members 14, and an operating mechanism section that moves the support members 14 up and down.

In the diagram, the opening means 1 is located at the same station as the station where the discontinuous cut means 11 is provided, or at a station downstream from this, 2 or 3 stations downstream.
5 is provided, and this opening means 15 opens the packaging material strip F.
A flat receiver for receiving the bag material strip F is lowered from above each time the table 16 and the packaging material strip conveying means 10 are stopped, and this receiver presses both sides of the discontinuous cut C on the table 16 and holds the bag material strip F. It consists of a pair of swing-type presser members 17 that are moved apart from each other in a direction along the plane, 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 strip F may be either the conveyance direction of the packaging material strip F or a direction perpendicular thereto, but in the illustrated example, the direction is the conveyance direction. .

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

Every time the packaging conveying means 10 stops, the swinging presser member 17 swings about the horizontal axis 19 in the transverse direction of the packaging material strip 10 against the second support member 18 that descends and rises from the standby position above. They are movably supported, and are normally resiliently supported (for example, by a spring 20) in close proximity to each other, and when the second support member 18 is lowered, the lower end of each of the swing-type presser members 17 is moved from the receiver. Due to the contact pressure when pressed against the surface of the table 16, the pair of swing-type presser members 17 spring 20
They are provided so as to be opposed to each other in the upstream and downstream directions in order to resist the elastic force of.

This swinging type presser member 17 is shown as an example in which a pair of members are provided facing each other in the upstream and downstream directions, but only one of them is a swinging 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 3 is provided on the downstream side of the packaging material belt conveying means 1o.
0, and this welding means 30 consists of a pair of heat seal blocks 31a and 31b which come into pressure contact with each other from a state of separation each time the packaging material belt conveying means 10 is stopped, and an operating mechanism for operating these. Furthermore, an opening sealing heat sealer 32 and a bottom sealing heat sealer 33 for heat sealing both sides of the opening are provided in parallel on at least one of the pressure contact surfaces of these heat seal blocks 31a and 31b. , and an electric control device for heating each of the heat sealers 32 and 33 during pressure bonding.

The passage of the packaging material strip F between the above-mentioned discontinuous slit means 11, opening means 15, and welding means 30 is established by a fixed guide roller 40 and a movable and fixable dancer roller 41, respectively. The length of the passage of the packaging material strips F can be adjusted independently.

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

Each of the above-mentioned operating mechanisms is a conventionally known cam.

A pure mechanical device such as a lever or a combination of an air cylinder device or the like is used as appropriate to operate these devices by repeating the cycle.

(Function of the embodiment) First, the packaging material strip F made of a flat tube is passed through the original fabric support device [50] sequentially 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 - Adjusting the path length of each packaging material strip conveying means 10 by the rollers 41 to correspond to the dimensions of each bag portion B;

When the packaging material strip conveying means 10 is driven intermittently at a constant rotation angle, the packaging material strip F is intermittently transferred at a constant rotation angle,
At each stop, the discontinuous cut means 11 and the opening means 15
, and welding means 30 operate at their respective stations.

That is, in the discontinuous cutting means 11, the support part 14 is lowered from the upper standby position, first presses the packaging material strip F with a narrow interval in the transverse direction of the packaging material strip F with the pressing member 13, and then the saw blade A shaped cutter 12 is used to pierce the packaging material band F between the pressing members 13 to make discontinuous cuts 1.
1 is provided on the packaging material band F, and these presser members 13 and saw blade-shaped cutters 12 return to their standby positions together with these supporting parts 14.

Further, at 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 pair of swing type presser members 17
Each lower end of the receiver is a discontinuous cut C in the packaging material band F on the table 16.
When the second support member 1 approaches the support stand 16, the pair of swing-type press members 17 separate from each other while holding the packaging material band F, and press the upper side of the packaging material $F. The discontinuous cuts C in the film are separated by the tensile force to form the opening P of the bag.

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 packaged article input station), the pair of heat seal blocks 31a and 31b are separated from each other across the opening P of the delivered 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 form an opening seal S1 and a bottom seal S2. form. On the downstream side of this part, a package Bi enclosing an object to be packaged is formed similarly to a known packaging device, and a bag portion B is formed one bag upstream of this package B.

As mentioned above, the method of the present invention can also be implemented in this embodiment.

(Effects of the Example) In this example configured and operated as mentioned above,
In addition to achieving the same effects as the above-mentioned device of the present invention,
There is nothing near the discontinuous cut means 11 and the opening means 15 to be heated, which simplifies these devices. In addition, since the opening means 15 simultaneously moves the bag material strip F in the upstream and downstream directions by the swing type presser member 17, the movement dimension of one swing type presser member 17 is small, and the bag material strip F is not wrinkled. , there is no risk of breakage.

[Brief explanation of the drawing]

The figures show things related to this invention, in which Fig. 1 is a mechanical diagram of the principle of the device invention, Fig. 2 is a perspective view of a bag material strip showing the process, and Fig. 3 is a diagram showing both sides of the opening. A perspective view of the bag material strip with the sides heat-sealed, FIG. 4 is a partially longitudinal side view of the opening of the opening means, and FIG. 5 is an enlarged partially longitudinal side view of the welding means during heat sealing. 6 and 7 are mechanical side views of a bag forming section and an opening forming device of a known packaging device, respectively. Main symbols 10 in the figure... Packaging material strip 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 the opening 33・・・・Heat sealer for bottom sealing No.

Claims (1)

[Claims] 1) Bag portions are sequentially formed from a synthetic resin packaging material band made of a flat tube, and the packaging materials are sequentially fed out with the bottom of the bag portion at the top, and the top bag portion is covered. In the method of heat-sealing the opening of the bag by sequentially introducing the packages, 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 packaging material is stopped. drilled,
Next, among these cuts, only the upper discontinuous cut is separated by the entire width of the packaging material band, and an opening is provided, and after putting the article to be packaged into the bag portion at the beginning of the packaging material band, the opening is opened. A packaging method characterized by simultaneously heat-sealing the bottom portion of the bag on the upstream side adjacent to the opening when heat-sealing. 2) A pair of clamping type packaging material belt conveying means for intermittently transporting a synthetic resin packaging material belt made of a flat tube in fixed size increments, and a pair of clamping type packaging material belt conveying means on the upstream side of this packaging material belt conveying means when the packaging material belt conveying means is stopped. A discontinuous cut means for perforating discontinuous cuts in the transverse direction in the packaging material strip for each discontinuous cut, and a means for relatively moving only the upper film between the formed discontinuous cuts; A package comprising an opening means for separating only the discontinuous cuts in the upper film, and a welding device provided 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 apparatus, the welding device comprises a heat seal block equipped with a heat sealer for sealing the opening, and the heat seal block has a bottom for sandwiching the opening and heat sealing the bottom of the bag on the upstream side of the bag. A packaging device characterized in that a heat sealer for sealing is installed in parallel with the heat sealer for sealing an opening.