JP2006176139A - Heat-sealing apparatus for packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-sealing apparatus for a packaging bag capable of surely opening an opening part of the laminated packaging bag with a simple structure and with a relatively small suction force. <P>SOLUTION: The heat-sealing apparatus is equipped with an opening part opening mechanism 6 for opening the opening part 3a of the packaging bag 3 storing a lens 2 and a heat-sealer 7 for heat-sealing the opening part 3a of the bag 3. The mouth 3a is opened by the mechanism 6 to store the lens 2 in the bag 3. The opening part opening mechanism 6 includes a pair of suction means 32A and 33A respectively sucking and holding open ends of a front film and a rear film of the packaging bag 3, and an air cylinder 34 for bringing the means 32A and 33A closer to/farther away from each other. The pair of suction means 32A and 33A are provided to be shifted by a distance d in the vertical direction, while the means 33A is inclined by an angle α in the perpendicular direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a packaging bag heat sealing device for heat-sealing an opening of a packaging bag containing contents.

  Plastic lenses for eyeglasses are on the market as single lenses. Such a plastic lens has a surface hardness that is not higher than that of a glass lens, so that the optical surface is easily damaged by friction. In addition, a plastic lens, which is a polymer material, easily changes its shape by reacting with moisture in the air. Therefore, generally, when storing spectacle lenses or transporting them to a store, they are stored in a packaging bag made of paper, plastic foam, laminated plastic film, etc. (see, for example, Patent Documents 1 to 3).

  The most common packaging bag for storing the contents is a rectangular bag which is formed by folding one film in half and heat-welding both side edges to open one side. Since such a packaging bag is supplied in a state where the front-side film and the back-side film are in close contact with each other, it is necessary to open the opening in advance when the lens is stored. As the method for opening the opening, the most common method is to adsorb and open the front-side film and the back-side film of the packaging bag by vacuum suction or to open the packaging bag by blowing air.

Japanese Utility Model Publication No. 5-68803 JP-T-2001-508717 Japanese Patent Laid-Open No. 10-24903

  Since the opening part of the packaging bag before storing the contents is normally closed, it is necessary to open the opening part by appropriate opening means for storing. As the opening means, a pair of suction means is usually used, and the opening is opened by vacuum suction of the film. However, since the front-side film and the back-side film of the packaging bag are in close contact with each other, there is a problem that a large suction force is required to open the opening against this adhesion force. In particular, in the case of a laminated packaging bag, since the film has a higher bending strength than a general synthetic resin film and is difficult to bend, it is difficult to separate or peel off the front-side film and the back-side film. Requires suction.

  Therefore, as a result of examining the relationship between the suction method of the film by the suction means and the magnitude of the suction force and conducting various experiments, the size, shape or position of the two suction means facing each other across the packaging bag are different. It has been found that the surface side film and the back side film can be reliably separated even with a relatively small suction force if an adsorption region where the adsorption portions for the film overlap each other and an adsorption region where they do not overlap are generated. .

  It can also be seen that if the suction surface of one suction means is inclined with respect to the suction surface of the other suction means, when the suction means is pressed against the film, the films are displaced and more easily separated. It was.

  The present invention has been made on the basis of the above-described conventional problems and examination results, and the object of the present invention is to reliably open an opening of a laminated packaging bag with a simple structure and a relatively small suction force. Another object of the present invention is to provide a heat sealing device for a packaging bag that can be used.

  In order to achieve the above object, the present invention provides a heat sealing device for heat-sealing an opening of a packaging bag containing contents, comprising an opening opening mechanism for opening the opening of the packaging bag, and opening the opening The mechanism includes at least a pair of suction means for sucking and holding the opening side end portions of the front side film and the back side film of the packaging bag, and a driving means for approaching and separating the pair of suction means. The adsorbing portions of the front-side film and the back-side film by means include an adsorbing region that overlaps with each other and an adsorbing region that does not overlap.

  In the present invention, the suction surfaces of the pair of suction means are different in size.

  Further, in the present invention, the shape of the suction surface of the pair of suction means is different.

  Further, according to the present invention, the pair of suction means have suction surfaces having substantially the same size, and one of them is arranged displaced with respect to the other.

  Further, according to the present invention, one of the pair of suction means is arranged to be inclined with respect to the advancing / retreating direction.

  Furthermore, in the present invention, a heat-sealed packaging bag is laminated and three sides are sealed.

  According to the present invention, the size, shape, or position of the pair of suction means is different so that there are suction areas where the suction portions for the two films overlap each other and non-overlapping suction areas. When the pair of adsorbing means adsorbing the film are separated from each other, they are separated so as to be caught from the adsorbing areas that do not overlap. In other words, the two adhering films are separated from the adsorbing areas where the adsorbing portions overlap each other with respect to the adsorbing areas that do not overlap. Accordingly, the opening of the packaging bag can be opened with a smaller suction force than in the conventional suction method in which the same suction area is sucked using the same size suction means.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
FIG. 1 is a cross-sectional view of an essential part showing an embodiment of a heat-sealing device for a packaging bag according to the present invention, FIG. 2 is a cross-sectional view showing a state in which the packaging bag is moved to a sealing position, and FIG. Fig. 4 is a plan view of a state in which the packaging bag is loaded in the packaging bag loading section, Fig. 5 is a side view of the state in which the suction means is pressed against the packaging bag, and Fig. 6 is a view of the suction means. FIG. 7 is a front view of the opening opening mechanism, FIG. 8 is a side view showing the fixed side mechanism of the heat sealer and the tension applying mechanism, and FIG. 9 is the heat sealer. FIG. 10 is a perspective view of the packaging bag, FIG. 11 is a flowchart of heat sealing by the heat sealing device, and FIG. 12 is a view showing the suction region by the suction means.

  1 to 3, a packaging bag heat sealing device denoted as a whole by reference numeral 1 is for heat-sealing a packaging bag 3 for storing contents 2, and a casing 4 installed on the floor surface. A packaging bag transport mechanism 5, an opening opening mechanism 6 for opening the opening 3a of the packaging bag 3, and an impulse heat sealer (hereinafter referred to as a heat sealer) for heat-sealing the vicinity of the opening 3a of the packaging bag 3. 7 and a tension applying mechanism 8 for applying tension to the opening 3 a of the packaging bag 3. Here, the content 2 stored in the packaging bag 3 is a plastic spectacle lens (hereinafter referred to as a lens). Hereinafter, detailed configurations of the packaging bag 3, various mechanisms 5 to 8, other mechanisms, parts, and the like will be described in more detail.

  In FIG. 10, the packaging bag 3 is a rectangular bag having a size sufficient to accommodate the lens 2, and the bottom side 10T is opened and the upper side 10U and the left and right side sides 10L, 10R are sealed. Yes. As the packaging bag 3, a bag having a laminated structure formed by a resin layer and a metal foil layer covering the outside of the resin layer is used in order to protect the lens 2 from moisture in the air. On the outer surface of the packaging bag 3, a trademark, the type of the lens 2 as the contents, a prescription value, a bar code for management, and the like are printed and displayed. In the present embodiment, the packaging bag 3 having a thickness of 0.2 mm, a width of 10.5 mm, and a height of 11.5 mm is used. A heat-sealed portion (hereinafter referred to as a seal portion) 3b of the packaging bag 3 is a portion that is about 20 mm above the opening 3a of the base 10T.

  The resin layer of the packaging bag 3 is required to have smoothness and moisture resistance. For this reason, as the resin layer, for example, a laminate film made of a polyethylene-based resin whose inside is polyethylene and whose outside is polyethylene terephthalate is used, and a metal foil layer is formed on the outer surface by evaporating aluminum or the like. ing. Moreover, as another resin layer, a polypropylene resin, a phenol resin, an epoxy resin, unsaturated polyester resin, unsaturated vinyl ester resin, diallyl phthalate resin etc. can be used, for example.

  Further, since the resin layer is laminated with the metal foil layer, the lens 2 is protected and the optical surface of the lens 2 is prevented from being damaged by friction. In particular, in the present embodiment, since the metal foil is laminated on the polyethylene resin, the smoothness is high, and the optical surface of the lens 2 can be protected more reliably. Since the polyethylene-based resin has high moisture resistance, when the lens 2 is made of plastic, it reacts with moisture in the air to prevent a shape change.

  1 to 3 again, the packaging bag transport mechanism 5 transports the packaging bag 3 from the packaging bag loading position S1 shown in FIG. 1 to the sealing position S2, and horizontally on the housing 4. A pair of air cylinders 12 that are installed in the left-right direction, a packaging bag loading unit 13 that reciprocates in the left-right direction by the air cylinder 12, and a pair that regulates the range of movement of the packaging bag loading unit 13 in the left-right direction. The dampers 14A and 14B and the linear guide 15 that supports the packaging bag loading unit 13 so as to be movable are formed.

  The packaging bag loading position S <b> 1 is a position where the packaging bag 3 is loaded into the loading space 20 of the packaging bag loading unit 13. The sealing position S2 is a position where the packaging bag 3 is heat sealed.

  The packaging bag loading unit 13 includes a movable frame 17 that reciprocates in the left-right direction by the air cylinder 12, a packaging bag storage body (FIGS. 4, 6, and 7) 18 provided on the movable frame 17, and the like. It consists of The packaging bag storage body 18 includes a pair of side wall plates 18A and 18B that are erected so as to face each other at a predetermined interval, and a V-shaped bottom plate 19 that connects lower portions of the side wall plates 18A and 18B. The space surrounded by the side plates 18A and 18B and the bottom plate 19 forms a loading space 20 for the packaging bag 3. The pair of side wall plates 18 </ b> A and 18 </ b> B has a fixing portion 21 bent at the lower end fixed to the upper frame 22 by a plurality of set screws 24. The upper frame 22 is attached to the movable frame 17 via a plurality of studs 25. Studs 25 a and 25 b (FIG. 7) located on the left and right sides of the plurality of studs 25 correct the inclination of the packaging bag 3 in the left-right direction when the lower ends of the left and right side edges of the packaging bag 3 come into contact with each other. Further, a pair of guide plates 26a and 26b for positioning the packaging bag 3 in the left-right direction are provided in the vicinity of the studs 25a and 25b.

  4, 6, and 7, the bottom plate 19 is integrally provided at the center of the lower end of the side wall plates 18 </ b> A and 18 </ b> B, and the width is set smaller than the side wall plates 18 </ b> A and 18 </ b> B. The dimension from the bottom of the bottom plate 19 to the upper ends of the side wall plates 18 </ b> A and 18 </ b> B is set sufficiently lower than the height of the packaging bag 3. On the left and right sides of the bottom plate 19, a pair of photosensors 27, 27 that detect both sides of the lower end of the packaging bag 3 are disposed. A stopper 28 (FIG. 1) bent in a U-shape is provided on the lower rear end side of the upper frame 22 corresponding to the pair of dampers 14A and 14B.

  3 to 5, the opening opening mechanism 6 includes a pair of front and rear holding plates 31A and 31B opposed to each other across the pair of side wall plates 18A and 18B, and the upper ends of the holding plates 31A and 31B. A total of four adsorbing means 32A, 32B, 33A, 33B consisting of a pair of two pairs arranged so as to face each other, and an air cylinder 34 etc. for moving the pair of holding plates 31A, 31B closer to and away from each other.

  Each of the suction means 32A, 32B, 33A, 33B includes a cylinder 35, a suction disk 36 attached to the front end of the cylinder 35, a pipe 37 that connects the cylinder 35 to a vacuum pump via an accumulator, and the like. It consists of The suction disk 36 of each suction means 32A, 32B, 33A, 33B is formed in a circular shape of the same size by an elastic material such as rubber or silicone rubber, and the suction surface is formed as a concave surface. Further, the suction means 32A and 33A, 32B and 33B facing each other are respectively attached to the holding plates 31A and 31B so that the suction plates 36 are separated by a distance d in the height direction as shown in FIGS. ing. The distance d is preferably about 1 to 2 mm.

  Further, the suction means 32A, 32B on the front side of the apparatus are attached to the holding plate 31A so that the axis is perpendicular to the surface of the packaging bag 3. On the other hand, the suction means 33A, 33B on the rear side are attached to the holding plate 31B with the axis inclined upward by an angle α. When the suction disk 36 of the suction means 33A, 33B is pressed against the film 3B on the back side of the packaging bag 3, it causes a component force in the oblique direction to cause a shift between the front side film 3A and the back side film 3B, This is because it is easy to separate the two films 3A and 3B. In this case, in the present embodiment, an example in which the cylindrical body 35 is tilted in the vertical direction and attached to the holding plate 31B is shown. However, the present invention is not limited to this, and the suction means 33A and 33B are moved in the horizontal direction. You may provide so that a required angle may incline. The inclination angle α in the vertical (or left / right) direction of the cylindrical body 35 is preferably about 5 to 7 °.

  1 to 3 and 7, the air cylinder 34 has a pair of front and rear movable bodies 34 a and 34 b and is attached to a packaging bag lifting device 37. The pair of movable bodies 34 a and 34 b have the holding plates 31 </ b> A and 31 </ b> B attached to their upper ends, respectively, and are moved closer to and away from each other by driving the air cylinder 34.

  The packaging bag lifting / lowering device 37 is for moving the packaging bag 3 to a predetermined height position at the time of heat sealing. The lifting / lowering air cylinder is installed upward at the rear end of the movable frame 17 via a bracket 38. 40. An elevating rod 42 of the air cylinder 34 is inserted into the elevating air cylinder 40 so as to be movable up and down. The lifting rod 42 is suspended from the lower surface of the air cylinder 34, and the lower end is in the lifting air cylinder 40 and is supported by the height adjusting rod 45 of the shock absorber 43.

  The shock absorber 43 is for adjusting the height of the sealing line (seal part 3b) of the packaging bag 3 by variably setting the height of the lifting rod 42, and is attached to the lower surface side of the bracket 38. Yes. The shock absorber 43 includes an outer cylinder 44 that contains a fluid having a high viscous resistance or a compression coil spring, the height adjusting rod 45 that is disposed in the outer cylinder 44 so as to be adjustable in height, It is composed of a double nut 46 and the like for fixing the height adjusting rod 45 to the outer cylindrical body 44. The height adjusting rod 45 has an upper end protruding above the outer cylindrical body 44 and inserted into the elevating air cylinder 40, and supports the elevating rod 42 on the upper surface.

  When adjusting the sealing line of the packaging bag 3, the double nut 46 is loosened and the height adjusting rod 45 is moved up and down to adjust the height of the lifting rod 42. In this case, when the height adjusting rod 45 is moved upward, the elevating rod 42 is raised and the opening opening mechanism 6 is moved upward, so that the sealing line of the packaging bag 3 can be brought closer to the opening end 3a side. it can. On the contrary, when the height adjusting rod 45 is moved downward, the opening opening mechanism 6 moves downward, so that the sealing line of the packaging bag 3 can be moved away from the opening end 3a. The packaging bag lifting / lowering device 37 is inserted into the housing 4 through a long hole 48 formed in the upper surface plate 47 of the housing 4 in the left-right direction.

  1 to 3, 8, and 9, the heat sealer 7 includes a heating body 51 and a press-bonding body 52 that are disposed opposite to each other in the front-rear direction, and the heating body 51 is press-bonded to the heating body 51 during heat sealing. Drive air cylinders 53, 54, etc., are provided above the seal position S2 so that the bodies 52 are brought close to each other and pressed against the seal portion 3b of the packaging bag 3.

  The heating body 51 is formed by sequentially laminating a fluororesin sheet and a glass tube on a linear heater, and moves forward and backward by the air cylinder 53. A film made of silicone rubber is affixed on the surface of the crimping body 52 to prevent the packaging bag 3 from adhering to the surface by heat sealing, and is moved forward and backward by the air cylinder 54. In addition, in this Embodiment, the example which comprised the heating body 51 and the crimping | compression-bonding body 52 by the heat seal part of the desk | table-type sealer (P-200) by a Fuji impulse company is shown.

  The air cylinder 53 is installed on an upper surface of a top plate 57 provided above the housing 4 and is configured to approach and separate the pair of mounting plates 55 and 56 from each other in synchronization. The pair of mounting plates 55 and 56 are formed in an L shape when viewed from the side, and upper ends thereof are respectively mounted on the movable portions 53 a and 53 b of the air cylinder 53. The pair of mounting plates 55 and 56 are positioned below the top plate 57 and face the front and rear with the packaging bag 3 in between. The heating body 51 is installed on the upper surface of the horizontal portion of the mounting plate 55 located on the front side of the packaging bag 3 among the pair of mounting plates 55 and 56.

  The air cylinder 54 is fixed to the lower surface of the top plate 57, and the crimping body 52 is attached to the tip of the movable rod 54a. The crimping body 52 is located above the rear mounting plate 56 and faces the heating body 51 with the packaging bag 3 in between.

  1, 8, and 9, the tension applying mechanism 8 applies both ends of the packaging bag 3 immediately below the sealing portion 3 b during heat sealing to apply tension to close the opening 3 a and stretch the heel. And a pair of fixed side holders 61a and 61b (FIG. 8) and a pair of movable side holders 62a and 62b (FIG. 9) disposed on the pair of mounting plates 55 and 56, respectively. ing.

  The pair of fixed side holders 61a and 61b are fixed to opposing end surfaces of the horizontal portions of the mounting plates 55 and 56, respectively. Of the pair of movable side gripping bodies 62a and 62b, the front side movable side gripping body 62a is connected to the horizontal front end surface of the mounting plate 55 via the linear guide 67, in other words, in the left-right direction of the device, in other words, the surface of the packaging bag 3. It is provided so as to be movable in a parallel direction. In addition, the rear movable side holding body 62b is configured to be moved in a direction away from the fixed side holding bodies 61a and 61b by the air cylinder 68 during heat sealing. The air cylinder 68 is fixed to the device fixing portion side, and the movable side holding body 62b is attached to the movable rod 68a via a connecting plate 69.

  In FIG. 3, the sealing part S2 is provided with a forced peeling means 70 for forcibly peeling the packaging bag 3 after heat sealing from the heating body 51 or the crimping body 52. The forcible peeling means 70 includes a suction plate 71 for vacuum-sucking the packaging bag 3 in the same manner as the suction means 32A, 32B, 33A, 33B, and is attached to the lower surface of the movable rod 54a of the air cylinder 54 via a bracket 72. It has been.

  In FIG. 1, a sensor 75 for detecting the packaging bag 3 is further provided below the seal portion S <b> 2, and the packaging bag 3 that has been heat-sealed is placed below the sealing bag S <b> 2 in the packaging bag storage portion in the housing 4. A guiding chute (not shown) is provided. The heat sealing device 1 includes a touch panel for setting operation timings, operation times, and the like of the various mechanisms, various switches, a counter for integrating the number of processed sheets of the packaging bag 3, and the like.

Next, the heat sealing operation of the packaging bag 3 by the heat sealing device 1 having the above structure will be described according to the heat sealing flowchart shown in FIG.
First, the heat sealing device 1 and the heat sealer 7 are turned on to enable heat sealing (step 100). In addition, heat seal conditions are set and the program is stored in the control unit.

  Next, the packaging bag 3 is put into the loading space 20 of the packaging bag loading unit 13 from above (step 101). At this time, the packaging bag transport mechanism 5 is located on the packaging bag loading position S1 side, and the stopper 28 is in contact with the rear damper 14B. The operator puts the packaging bag 3 into the loading space 20 one by one. At that time, the packaging bag 3 is loaded with the opening 3a facing up. The loading space 20 is narrow at the bottom and is tapered toward the top, and the V-shaped bottom plate 19 positions the front-rear direction of the lower end of the packaging bag 3. Further, the left and right direction of the packaging bag 3 is positioned by the pair of left and right guide plates 26a and 26b (FIGS. 2 and 7), and the inclination of the packaging bag 3 is corrected by the pair of left and right spacing members 25a and 25b.

  When the pair of detection sensors 27 detect that the packaging bag 3 has been normally stored in a predetermined position in the packaging bag loading section 13 (step 102), the opening opening mechanism 6 is activated and the air cylinder 34 (FIG. The pair of holding plates 31A, 31B are brought close to each other by the driving of 3), and the suction plates 36 of the suction means 32A, 32B, 33A, 33B are pressed against the front side film 3A and the rear side film 3B of the packaging bag 3, respectively. Then, the suction means 32A, 32B, 33A, 33B are evacuated to suck and separate the front side film 3A and the back side film 3B (step 103). FIG. 6 shows this state.

At this time, the adsorbing means 32A and 33A, 32B and 33B are provided by being shifted by a distance d (FIG. 5) in the height direction, so the adsorbing portions of the front surface side film 3A and the back surface side film 3B are different. As shown, suction areas K ₁ that overlap each other and two suction areas K ₂ and K ₃ that do not overlap each other are formed. For this reason, when the films 3A and 3B are sucked by the suction means 32A and 33A and 32B and 33B, the suction areas K ₂ and K ₃ that do not overlap each other receive only the suction force by the suction means that sucks the areas. Separate the film so that it comes from the other film.

  Further, since the rear suction means 33A and 33B are inclined upward by an angle α, when they hit the back surface side film 3B, an oblique component is generated so that the back side film 3B is made to the front side film 3A. And move it up. For this reason, the adhesive force between the front surface side film 3A and the back surface side film 3B is reduced and the film can be easily peeled off, so that the opening 3a can be easily opened. At this time, if air is blown from above toward the opening 3a of the packaging bag 3, the opening 3a can be more easily opened, and the suction force by the suction means 32A, 32B, 33A, 33B can be further reduced. .

  When the opening 3a of the packaging bag 3 is opened, the lens 2 is put into the packaging bag 3 from above (step 104). An operator performs the loading operation of the lens 2. When the lens 2 is put into the packaging bag 3, the vacuum suction by the suction means 32A, 32B, 33A, 33B is stopped, and the suction state of the packaging bag 3 is released.

  When the lens 2 has been put into the packaging bag 3, the operator turns on the operation button (step 105). When the operation button is turned on, the packaging bag transport mechanism 5 is driven to transfer the bag packaging bag 3 to the seal portion S2 (step 106). The transfer of the packaging bag 3 is performed by moving the opening opening mechanism 6 and the packaging bag loading unit 13 from the packaging bag loading position S1 to the sealing position S2 by driving the air cylinder 12. FIG. 2 shows a state in which it is moved to the seal position S2. When the opening part opening mechanism 6 and the packaging bag loading part 13 move to the sealing position S2 and stop, the stopper 28 comes into contact with the front damper 14A and stops. And the raising / lowering air cylinder 40 (FIG. 1) drives and raises the opening part opening mechanism 6 and the packaging bag loading part 13 to predetermined height. Thereby, the upper end part of the packaging bag 3 is inserted between the heating body 51 and the crimping | compression-bonding body 52 of the heat sealer 7, and the seal | sticker part 3b is made to correspond with the height of the heat sealer 7 (step 107). FIG. 3 shows this state.

  When the packaging bag 3 is raised to a predetermined height, the air cylinder 53 of the tension applying mechanism 8 is then driven to bring the pair of attachment plates 55 and 56 closer to each other, and the pair of fixed side holding bodies 61a and 61b and the movable side The holding bodies 62a and 62b are pressed against both end portions on the upper end side of the packaging bag 3 (step 108). Thereby, a pair of fixed side holding body 61a, 61b and movable side holding body 62a, 62b hold | grip the upper end side edge part of the packaging bag 3, respectively. Next, the air cylinder 68 (FIG. 1) is driven to move the movable side holding body 62b away from the fixed side holding bodies 61a and 61b, thereby applying a predetermined tension to the upper end of the packaging bag 3 (step 109). . Thereby, the part to be sealed of the packaging bag 3 is tensioned, the opening 3a is closed, and the wrinkles are removed. At this time, the movable gripping body 62a is not moved directly by the air cylinder 68, but is pressed against the packaging bag 3, so that it moves integrally with the packaging bag 3 and the movable gripping body 62b along the linear guide 67. Then, a predetermined tension is applied to the packaging bag 3.

  When the packaging bag 3 is sandwiched and held by the tension applying mechanism 8 and a predetermined tension is applied, the opening opening mechanism 6 and the packaging bag loading unit 13 are lowered to the original height by driving the lifting air cylinder 40. Then, the air cylinder 12 is driven to move and return from the seal position S2 to the original packaging bag loading position S1, and the next packaging bag 3 can be loaded.

  Next, a predetermined tension is applied to the packaging bag 3 by the tension applying mechanism 8, and the seal portion 3b of the packaging bag 3 is heat-sealed by the heat sealer 7 (step 110). The heat sealing of the sealing portion 3b is performed by driving the air cylinder 54 to move the crimping body 52 to the left in FIG. 9 and pressing the sealing portion 3b against the heating portion of the heating body 51 with a predetermined pressure. It is performed by energizing for a predetermined time and heating to a predetermined temperature. When the seal portion 3b of the packaging bag 3 is heat sealed by the heat sealer 7, the polyethylene resin on the inner surface side of the packaging bag 3 is melt-bonded to seal the opening 3a. In this way, when tension is applied to the packaging bag 3 and heat sealing is performed, it is possible to prevent wrinkles from being generated in the sealing portion 3b during sealing, and thus sealing can be reliably performed. Although the heating temperature at the time of heat sealing varies depending on the material and thickness of the packaging bag 3 to be used, it is about 100 to 200 ° C. in the present embodiment, and preferably about 170 to 190 ° C. The energization time (sealing time) to the heating body 51 is about 1 to 3 seconds.

  Even after the heat sealing of the sealing portion 3b by the heat sealer 7 is completed and the energization to the heating body 51 is stopped, the packaging bag 3 is cooled while maintaining the tension applied state by the tension applying mechanism 8 for a certain time (step 111). . This is to avoid thermal shrinkage of the packaging bag 3 after heat sealing. The cooling time of the seal part is about 5 to 10 seconds.

  When the heat sealing of the packaging bag 3 is completed, the crimping body 52 is retracted by driving the air cylinder 54 to release the pressing state of the packaging bag 3 (step 112). Further, the pair of mounting plates 55 and 56 are retracted by driving the air cylinder 53, and the holding state of the packaging bag 3 by the fixed side holding bodies 61a and 61b and the movable side holding bodies 62a and 62b is released (step 113). .

  When the packaging bag 3 is released from the heat sealer 7 and the tension applying mechanism 8, it falls by its own weight, and is stored in the packaging bag storage section in the housing 4 through the chute (step 115). Storage of the packaging bag 3 is detected by a detection sensor 75.

  When the crimping body 52 is released from the heat sealer 7, the heat-sealed seal portion 3 b of the packaging bag 3 may be in close contact with the heating portion of the heating body 51 or the crimping body 52 and may not fall. For this reason, when the packaging bag 3 does not fall even after a certain period of time, the forced peeling mechanism 70 is driven by the signal of the detection sensor 75 to vacuum-suck the packaging bag 3 and swing left and right from the heating body 51 or the crimping body 52. The packaging bag 3 is forcibly removed (step 114). Then, after removing the packaging bag 3, when the vacuum suction by the forced peeling mechanism 70 is stopped, the packaging bag 3 falls downward and is stored in the packaging bag storage portion in the housing 4. Thereafter, the packaging bag 3 is sequentially heat-sealed in the same manner.

Thus, in the present invention, two films can be separated with a smaller suction force than in the prior art. In other words, conventionally, a pair of suction means having the same size are opposed to each other with their axes aligned, and the suction portions of the front-side film and the back-side film are made the same suction area. Even if the front side film and the back side film are used, only the same suction location receives the same suction force, and the squeezing action does not work, and a large suction force is required to peel off the two films.
On the other hand, in the present invention, the suction means 32A and 33A, 32B and 33B facing each other of the opening opening mechanism 6 are shifted by a distance d in the height direction, so that the surface side film by the suction means 32A and 32B is provided. The adsorption part of 3A and the adsorption part of the back side film 3B by the adsorption means 33A, 33B are different, so that the so-called twisting action works compared with the conventional structure in which the adsorption parts match, so that both films 3A, 3B can be moved with a small suction force. Can be separated.

  In the present invention, the suction means 33A and 33B on the rear side are provided to be inclined upward by an angle α. Therefore, when the suction means 33A and 33B are pressed against the back side film 3B, a component force obliquely upward is generated. Since the generated rear surface side film 3B is shifted upward with respect to the front surface side film 3A, the front surface side film 3A and the rear surface side film 3B are more easily separated. Therefore, the opening 3a of the packaging bag 3 can be reliably opened with a smaller force.

  Further, in the present invention, the tension is applied to the packaging bag 3 by the tension applying mechanism 8 when the packaging bag 3 is heat-sealed, and the opening end portion is tensioned. Can be sealed.

Here, in the present embodiment, the suction means 32A, 32B and 33A, 33B having the same size are used, and the opposing suction means 32A and 33A and 32B and 33B are shifted by a distance d in the vertical direction. , those adsorption portion of the front film 3A and the back side film 3B, there is shown an example in which the adsorption region K _2, K ₃ non-overlapping with the suction region K ₁ overlapping each other, the present invention is to be limited thereto Instead, the suction portions 32A, 32B and 33A, 33B are made different in size or shape so that the suction portions of the front surface side film 3A and the rear surface side film 3B do not overlap with the suction regions that overlap each other. It may be an area.
Moreover, since the adsorption | suction means of the opening part opening mechanism 6 is based on the magnitude | size of the packaging bag 3, when the packaging bag 3 is small, one-to-one set may be sufficient.

  Although this invention demonstrated the case where it applied to the packaging bag 3 of the spectacle lens 2 as a content, it is possible to apply not only to this but also to the packaging bag of various articles other than a lens.

It is sectional drawing of the principal part which shows one Embodiment of the heat sealing apparatus of the packaging bag which concerns on this invention. It is sectional drawing which shows the state which moved the packaging bag to the seal position. It is the III-III sectional view taken on the line of FIG. It is a top view of the state which loaded the packaging bag in the packaging bag loading part. It is a side view which shows the state which pressed the adsorption | suction means on the packaging bag. It is a top view which shows the state which opened the opening part of the packaging bag by the adsorption | suction means. It is a front view of an opening part opening mechanism. It is a side view which shows the fixed side mechanism part of a heat sealer and a tension | tensile_strength provision mechanism. It is a side view which shows the movable side mechanism part of the heat sealer and a tension | tensile_strength provision mechanism. It is a perspective view of a packaging bag. It is a flowchart of a heat seal. It is a figure which shows the adsorption | suction area | region by an adsorption | suction means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heat sealing apparatus, 2 ... Lens, 3 ... Packaging bag, 3A ... Front side film, 3B ... Back side film, 3a ... Opening part, 3b ... Seal part, 4 ... Housing, 5 ... Packaging bag conveyance mechanism, 6 ... Opening mechanism, 7 ... Pulse heat sealer, 8 ... Tension applying mechanism, 32A, 32B, 33A, 33B ... Adsorption means.

Claims (6)

In the heat-sealing device of the packaging bag that heat-seals the opening of the packaging bag containing the contents,
An opening opening mechanism for opening the opening of the packaging bag;
The opening opening mechanism includes at least a pair of suction means for sucking and holding the opening side end portions of the front surface side film and the back surface side film of the packaging bag, and a driving means for approaching and separating the pair of suction means,
The packaging bag heat-sealing device, wherein the adsorbing portions of the front-side film and the back-side film by the pair of adsorbing means include an adsorbing region that overlaps with each other and an adsorbing region that does not overlap.   2. The packaging bag heat sealing device according to claim 1, wherein the suction surfaces of the pair of suction means are different in size.   2. The packaging bag heat sealing device according to claim 1, wherein the suction surfaces of the pair of suction means have different shapes.   2. The packaging bag heat sealing device according to claim 1, wherein the pair of suction means have suction surfaces having substantially the same size, and one of them is displaced with respect to the other. .   2. The packaging bag heat sealing device according to claim 1, wherein one of the pair of adsorbing means is inclined with respect to the advancing / retreating direction. The heat sealing device for a packaging bag according to claim 1, wherein the packaging bag to be heat sealed is a laminated bag and three sides are sealed.

Images