JP2006044732A - Cover film sealer for upper surface of tray - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cover film sealer for a tray periphery including a deaeration structure. <P>SOLUTION: When a frame-shaped seal table 28 supporting the periphery of a tray 10 is pushed up toward a seal frame 38 in an upper region while separating the table 28 from a platform 27, the internal space 58 of a tubular pump wall 56 coupled with the seal table 28 varies in volume, gets into a negative pressure and sucks the air in a lower region of a film 41 above the tray through a suction hole 60 formed in a groove 57. Thus, the periphery of the film 41 is further adhered by a pressurizing element 46 while compressing a coil spring 48 by the seal table 28, and in addition the seal table 28 is pressed against the lower surface of a sealer 39 to weld the cover film 41 to a peripheral flange of the tray 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cover film in which a frame-type seal stand that supports a peripheral flange portion of a tray that accommodates an object to be packaged from above is pushed up toward the upper seal frame, and is disposed between the seal stand and the seal frame. The present invention relates to a sealing device that melts and presses a peripheral flange portion of the tray.

  The following Patent Document 1 arranges a seal frame in the upper region of the transport track of the belt-shaped cover film, while installing a frame-shaped seal table in the lower region of the seal frame across the film, An apparatus is disclosed in which a mounted tray is pushed up integrally with the sealing base, and the film is pressure welded to a flange portion of the tray by a pressing pressure of the sealing base against the seal frame.

  Note that the film holding mechanism disposed around the seal frame in the upper region is elastically pressed against the above-described seal stand before the tray contacts the seal frame in the upper region, and the tray. The film is brought into intimate contact with the sealing table. Eventually, this film pressing mechanism is a nursing that presses the film covering the mountain shape on the package to be laid up on the tray in a tense manner against the seal stand, and welds the film to the tray with the wrinkles removed. It works like a person.

  However, since the film holding mechanism causes the cover film to be in close contact with the sealing base around the tray, the film causes a parachute phenomenon due to the air pressure at the top of the tray when the tray is pushed up toward the film. Therefore, there is a possibility that a hermetic package containing air is sometimes formed, and there is a problem that the exclusion effect is poor even if the air embraced by urethane rubber is pressed.

JP-A-2004-136915

  The problem to be solved is that air removal is easy, and in some cases, the air removal in the heat shrinking process using a shrinkable film is made almost completely.

  The present invention relates to conveyor track under region of the strip cover film, while placed Bratt home tray mounted to hold the tray in a predetermined position, the tray periphery by a frame seal mount disposed around the platform flange the same tray support portion, pushed toward the sealing frame disposed in the cover film above range, the pressing pressure with respect to the sealing frame of the seal base, sealing device for pressure weld wearing the cover film to the flange portion of said tray A cylindrical pump wall that closely surrounds the periphery of the platform is integrally connected to the lower side of the seal base, and the other end of the suction hole opened outside the tray in the seal base is connected to the inside of the pump wall. It is configured to open to the pump space.

After placing the tray at a prescribed position on the platform by timely means, when the tray is supported by the sealing base and pushed up toward the upper seal frame, the cylindrical pump wall that rises integrally with the sealing base is Since the periphery of the platform slides in an airtight manner, the pump space between the tray and the platform generates a negative pressure due to a volume change, and the suction space communicates between the outside of the tray in the sealing base and the pump space. As a result of the negative pressure in the lower area of the cover film, the film can be welded to the tray while the air inside the film is sucked into the pump space by the pump action.

  The volume change of the pump space is quite large, and if the negative pressure is increased too much, a tray made of plastic or the like may be bent by the differential pressure. Therefore, in such a case, the air density of the gap between the cylindrical pump wall and the platform is set in a timely manner so that unnecessary pressure is not applied to the tray.

The cylindrical pump wall may be formed of a soft material, and the air may push the cylindrical pump wall and back flow into the pob space. The amount of air adapted to the rigidity may be replenished by adjusting the flow rate, or the negative pressure in the pump space may be used to suck in inert gas and change the inside of the tray to be sealed into a gas environment. Good.

  FIG. 2 is a front view of the entire apparatus, while FIG. 3 is a side view of the apparatus. In these drawings, the overall structure of the apparatus is described. almost slidably supported on both sides a pair of rails 17 via a bilateral slider 24 of the base plate 20 to be fixed to the intermediate, a female screw member 22 fixed to the middle lower surface of the base plate 20, the motor 25 and it is powered by Since it engages with the rod 23, the main frame 16 reciprocates along the rail 17 in the directions of arrows 53 and 54 by forward and reverse rotation of the screw rod 23.

  In addition, a platform 27 formed of a plate material is horizontally disposed at the upper end of a leg 26 standing on the upper surface of the base plate 20, and a frame-shaped continuous sealing base 28 is disposed around the platform 27, while the main frame A crank lever 31 provided at both ends of a shaft 30 supported by a bearing 29 at the lower part and the sealing base 28 are connected via a connecting rod 40, and the rotational power of a motor pinion 32 fixed to the main frame is supplied via a gear 33. Thus, the seal base 28 moves up and down independently and in a constant cycle within the main frame.

  As described above, when the seal base 28 moves up, the main frame 16 moves forward in the direction of the arrow 53, and when the seal base 28 moves down, the main frame 16 moves backward in the direction of the arrow 54. As a result of the above motion synthesis, the seal base 28 performs a block motion clockwise in FIG.

  As already described in FIG. 4, the base plate 20 of the main frame is slidably supported on the rails 17 on the side plates 34 on both sides, and the two parallel platforms 27 and these are mounted on the base plate 20. An enclosing frame-type seal stand 28 is disposed.

  Previous figure is a plan view of a so-called tray conveyor track, a pair of endless a touch bars 12 to push the tray 10 in tandem at equal intervals along the upper surface of the track plate 11 in a horizontal two rows were placed along the track plate 11 They are arranged at equal intervals between the chains 13.

  Also the stay 14 which is bridged between both side plates 34 support the horizontal track plates 11 of the two rows, said touch bars 12 but is of letting slide moves the tray 10 on the orbital plate 11, the track plate 11, the base plate 20 disposed in the notch region 15 formed in the middle of 11, reciprocates in the same region along the side rails 17 on both sides with the platform 27. In this case, in response to reciprocation of the base plate 20, expands and contracts by sliding the finger-shaped rods 35 and the finger-shaped ferry 36 of the track plate 11, to assist the movement of the tray 10 in the track.

Therefore, the tray 10 with dished to be packaged as shown in FIG. 5 is pushed touch bars 12 provided on the chain 13, it is possible to reach the platform 27 rides over the sealing frame 28, the tray 10 Can be stopped on the platform 27. In FIG. 7 in which this state is viewed from the front, the two trays 10 are stopped in parallel on the individual platforms 27.

  In FIG. 1, a mechanism for winding a belt-like cover film 41 that moves at the same speed as each tray 10 by the rotation of a reel 42 is installed on the transporting track of the tray. The film 41 is basically configured to move intermittently by one pitch, but the movement of the film surface facing the tray 10 is synchronized with the movement of the tray 10.

  3, an upper support frame 37 fixed to the main frame 16 and a lower seal frame 38 are arranged in the upper region of the transport track of the cover film 41 in FIG. When these components are enlarged in FIG. 1, the seal frame 38 in the lower region is provided with a sealer 39 having the same outline as the peripheral flange of the tray 10 placed on the lower seal base 28 and facing downward. A pipe heater 43 for heating the front sealer is installed and configured.

  On the other hand, the support frame 37 in the upper area is provided with a cutting blade 50 around the sealer 39 and a number of slide rods 47 each having a pressure member 46 at the lower end around the cutting blade. Arranged in such a way as to be elastically biased in the direction.

  1 is supported by a lower box block 55, and a cylindrical pump wall 56 integral with the block 55 is arranged in the vicinity of the platform 27 inside the block. To do. A continuous groove 57 formed on the upper surface of the sealing base 28 so as to surround the tray 10 is a film cut groove into which the cutting blade 50 enters from above, and this groove 57 and the inside of the pop wall 56 An air suction hole 60 is formed between the pump space 58 and the pump space 58.

  6, in which in a state of lacking part displaying the plane of the seal base 28, the seal base 28 surrounding the two platforms 27 raises support flange portion of the tray 10 to be placed on the platform 27 The surface 59 is provided, and the film cut grooves 57 are formed in the surface 59, and the suction holes 60 are opened in the grooves 57 at a predetermined interval.

  In the process in which the seal base 28 in the state of FIG. 7 is lifted by the power acting from the direction of the arrow 61 in the lower part of FIG. 8, the seal base 28 supports and lifts the tray 10. Since the volume of the pump space 58 between the platform 27 fixed to the base plate 20 in the area and the tray 10 is gradually enlarged, the air in the lower area of the cover film 41 is sucked through the suction hole 56 by vacuuming the space 58. The air is sucked into the space 58, and the lower area of the film 41 is made negative.

  Then, as shown in FIG. 9, the package 18 in the tray 10 presses the cover film 41 against the urethane rubber 61 in the upper region by further raising the seal table 28, but just before that, the seal table 28 compresses the coil spring 48. since close contact with film 41 periphery in a pressure element 46 with the air of the film 41 under zone is sucked in centrally pump space 58 as indicated by arrow 62, adhering the film 41 to be packaged 18 . Then, as the seal stand continues to rise, the seal stand 28 is pressed against the lower surface of the sealer 39 to weld the cover film 41 to the peripheral flange of the tray 10.

  The air suction line 65 connected to the hole 64 in the wall of the pump space 58 includes a flow rate adjusting valve 66, and the degree of adhesion of the film 41 to the package 18 can be adjusted by adjusting the amount of leakage to the pump space 58 through the line 65. .

  Further, an inert gas cylinder is connected to the air suction line 65, and when the seal base 28 is raised, the gas is sucked into the pump space 58 while adjusting the flow rate by the valve 66, and the inside of the tray 10 contains gas. It can be sealed with a slight air content.

  By installing the seal frame 38 that reciprocates in a horizontal track and the seal stand 28 including the pump chamber 58 in the lower region of the upper seal frame so as to perform box motion motion, the packaging with the air venting function can be efficiently performed. It becomes possible to do well.

Side view of the main part of the device Front view of the entire device Side view of the entire device Top view of the tray transport path Partial side view of the previous figure Plan view with part of the previous figure removed Action explanatory diagram at the front of the entire device Action explanatory diagram at the front of the entire device Action explanatory diagram at the front of the entire device

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Tray 13 ... Endless chain conveyor 27 ... Platform 28 ... Seal stand 34 ... Vertical crank 38 ... Seal frame 41 ... Film 56 ... Pump wall 58 ... Pump space 60 ... Suction hole 65 ... Line 66 ... Flow control valve

Claims (5)

A conveyor track under region of the strip cover film, while placed Bratt home tray mounted to hold the tray in a predetermined position, supporting the flange portion of said tray peripheral a sealing block arrangement the frame die around the platform Te of the tray, pushed toward the sealing frame disposed in the cover film above range, the pressing pressure with respect to the sealing frame of the seal base, a sealing device for pressure weld wearing the cover film to the flange portion of said tray The apparatus includes a cylindrical pump wall that is closely surrounded by the periphery of the platform, integrally connected to the lower side of the seal base, and the other end of the suction hole that opens to the outside of the tray placement area of the seal base. Is opened to the pump space inside the pump wall. The apparatus according to claim 1, wherein the cylindrical pump wall is formed of a soft material. The apparatus according to claim 1, wherein an air suction line including a flow rate adjusting valve is provided outside a port communicating with the inside and outside of the pump wall. The apparatus of Claim 1 which provided the inert gas suction line provided with the flow regulating valve in the outer side of the port which connects the inside and outside of a pump wall. The apparatus according to any one of claims 1 to 4, wherein a conveyor for carrying the column trays onto the platform in synchronization with the transport of the cover film is installed in the lower region of the transport track of the belt-shaped cover film.