JP2012066869A - Bottom seal bar for standing pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bottom seal bar for standing pouches, the bottom seal bar enabling production of a standing pouch having superior seal strength by improving abutment between sealing surfaces in whatever kind of shape and size of a sealing bottom.SOLUTION: The bottom seal bar for standing pouches of a bag manufacturing apparatus for standing pouches which performs bottom sealing, is constituted of an upper side bottom seal bar and an under side bottom seal bar, wherein un upper side projection with a shape corresponding to a bottom seal shape is arranged at the center of the upper side bottom seal bar and a warping prevention projection is arranged on each of both lengthwise outer side positions of the upper side bottom seal bar with respect to the upper side projection, and un under side projection with a shape corresponding to the bottom seal shape is arranged at the center of the under side bottom seal bar and a warping prevention projection is arranged on each of both lengthwise outer side positions of the under side bottom seal bar with respect to the under side projection in such a way that the warping prevention projections on the under side bottom seal bar abut the warping prevention projections on the upper side bottom seal bar, respectively.

Description

  The present invention relates to a bottom seal bar for a standing pouch.

  The standing pouch is formed in a bag shape by sandwiching a folded bottom material between two stacked body members and heat-sealing the edges (bottom portion and side portion) of each other. The body and bottom material are strip-like films with a large number of unsealed pouches for standing pouches, and move in multiple seal positions while being intermittently fed in the feed direction. The body material and the bottom material are heat-sealed (bottom seal), and the two body materials are heat-sealed at the side portions (side seal). In the bottom seal, the body and the bottom material are sandwiched between bottom seal bars and heated to heat seal.

  Since the bottom seal portion seals the body material and the bottom material at the same time, in general, the bottom seal portion is often sealed with a metal seal bar in the upper and lower sides.

  FIG. 1 shows a bottom seal heating unit in a general standing pouch bag making machine. In the bottom seal heating part, a lower bottom seal bar 4 is fixed to the lower heater block 2a, and a lower projection 8 corresponding to the bottom seal shape is integrally provided at the center of the lower bottom seal bar 4. ing.

  An upper bottom seal bar 3 is fixed to the upper heater block 2b, and an upper protrusion 7 is integrally formed at the center of the upper bottom seal bar 3 in accordance with the bottom seal shape. Furthermore, the upper heater block 2 b is fixed to the pressure beam 1.

  The pressure beam 1, the upper heater block 2 b, and the upper bottom seal bar 3 are moved up and down by a vertical movement device such as an air cylinder connected to the upper side of the pressure beam 1. The film sandwiched between the side bottom seal bars 4 is sealed.

  Since the total length of the upper bottom seal bar 3 and the lower bottom seal bar 4 is longer than the length of the upper projection 7 and the lower projection 8 that actually seal the film, the load of the seal acts. The position of the pressure beam 1 often comes outside both ends of the upper protrusion 7 and the lower protrusion 8 that actually seal the film.

  Therefore, when the bottom portion is sealed, as shown in FIG. 2, the pressure beam 1 is further loaded downward in order to apply a sealing load after the upper projection portion 7 and the lower projection portion 8 contact each other. At this time, the upper bottom seal bar 3 and the upper heater block 2b are deformed into a convex shape with both ends of the seal surface of the upper bottom seal bar 3 as fulcrums. As a result, a gap 5 is generated in the central portion of the upper protrusion 7 and the lower protrusion 8 in contact with each other, and the contact is not good.

  As a result, the pressure distribution on the bottom seal surface tends to be strong on the outside of the seal surface and very weak on the center of the seal surface. As a result, a desired amount of heat and pressure cannot be applied to the film, and problems such as a lack of sealing strength may occur.

As a countermeasure, at the production site, a metal thin plate called shim was sandwiched between the heater block and the seal bar to forcibly correct the warp and hit it. However, in this case, since the adhesion between the heater block and the seal mold is deteriorated, the heat is not sufficiently transmitted to the seal bar, and the set temperature and the seal surface temperature may be greatly different. There was a problem that if the management was neglected, it would not be possible to win.

  This problem is similar to the fact that when a nip load is applied from both ends of the nip roll with a take-up dry laminator or the like, deflection occurs at the center of the nip roll and the nip force cannot be transmitted. In the case of this nip roll, a device has been devised to make a hit by making the roller shape a convex crown shape.

A patent has also been filed in which the air between the films of the seal portion is removed by making the seal surface convex in this way also in the seal bar (for example, Patent Document 1).
Known documents are shown below.

JP 2004-338362 A

  However, in the above method, it is very difficult to form a seal bar having a wide seal area such as a bottom seal bar and having a complicated shape in this manner.

  The present invention has been made in view of the above circumstances, and provides a bottom pouch for a standing pouch with improved sealing strength and good sealing strength in any shape and size of the bottom seal shape. It is an issue.

  The invention according to claim 1 of the present invention is a standing pouch bottom seal bar of a standing pouch bag making machine for performing bottom sealing, comprising an upper bottom seal bar and a lower bottom seal bar, and the upper bottom seal bar. An upper protrusion is provided at the center of the bottom seal, and a warp prevention protrusion is provided on the outside of the upper protrusion, and the bottom seal bar is also aligned with the bottom seal. For a standing pouch, wherein a lower protrusion is provided, and a warp prevention protrusion is provided on the outside of the lower protrusion so as to abut against the warp prevention protrusion of the upper bottom seal bar. It is a bottom seal bar.

  In the invention according to claim 2 of the present invention, the position of the warp preventing projection is different from the position of the pouch sealed at the bottom when the bottom seal is formed on the body and the bottom material of the continuous belt-like body. In the unsealed pouch, it is provided so as to hit a position including the boundary part of the part where the two body members and the folded bottom material are sealed and the part where only the two body members are sealed. The bottom seal bar for a standing pouch according to claim 1.

  The invention according to claim 3 of the present invention is the bottom seal bar for a standing pouch according to claim 1 or 2, wherein the warp preventing protrusion is provided by cutting the seal bar.

  The invention according to claim 4 of the present invention is the bottom seal bar for a standing pouch according to claim 1 or 2, wherein the warp preventing protrusion is mechanically fixed to the seal bar.

According to a fifth aspect of the present invention, a plurality of the warp prevention protrusions are provided outside the upper protrusion, and a plurality of the warp prevention protrusions are provided outside the lower protrusion. The bottom seal bar for a standing pouch according to any one of claims 1 to 4, wherein the bottom seal bar is provided.

  By providing the protrusion for warpage prevention of the present invention on the seal bar, the warp of the seal bar and the heater block can be prevented, and a good contact of the seal surface can be obtained.

  In addition, since the shim is not inserted, the management is simplified and the contact between the heater block and the seal bar is improved, and the temperature difference between the set temperature and the seal surface can be suppressed.

  Furthermore, in a typical standing pouch bag making machine, a leak is prevented by applying a local seal called a point seal at the boundary between the part where the bottom material is inserted and the part where only the body material is inserted. However, it is possible to omit the point seal that is normally installed on the side seal portion by installing the warp preventing projection on the point seal portion.

  As described above, there is no seal failure due to poor contact between the upper and lower seal bars, and a seal leakage problem can be eliminated.

It is explanatory drawing which showed typically the bottom seal heating part of the bag making machine for general standing pouches. It is explanatory drawing which showed typically the state pressurized with the bottom seal | sticker heating part of the bag making machine for general standing pouches. It is explanatory drawing which showed typically an example of the bottom seal bar for standing pouches of this invention. It is explanatory drawing which showed typically the bottom seal | sticker heating part which attached an example of the bottom seal bar for standing pouches of this invention. It is explanatory drawing which showed typically the other example of the bottom seal bar for standing pouches of this invention.

Hereinafter, modes for carrying out the present invention will be described.
FIG. 3 is an explanatory view schematically showing an example of the bottom seal bar for a standing pouch according to the present invention, and FIG. 4 schematically shows a bottom seal heating unit to which an example of the bottom seal bar for a standing pouch according to the present invention is attached. It is explanatory drawing shown.

  The standing pouch bottom seal bar 100 of this example is composed of an upper bottom seal bar 3 and a lower bottom seal bar 4 as shown in FIG. At the center of the upper bottom seal bar 3, an upper protrusion 7 is integrally provided in accordance with the bottom seal shape. Also, a lower projection 8 is integrally provided at the center of the lower bottom seal bar 4 so as to match the shape of the bottom seal.

  Further, warpage preventing projections 6 are provided in the width of the upper bottom seal bar 3 on the outer side of the upper projections 7 of the upper bottom seal bar 3 (both sides in the longitudinal direction of the upper bottom seal bar 3). Further, on the outer side of the lower projection 8 of the lower bottom seal bar 4 (both sides in the longitudinal direction of the lower bottom seal bar 4), the warp preventing projection 6 is similarly formed with the width of the lower bottom seal bar 4. The upper bottom seal bar 3 is provided so as to abut against the warp preventing protrusion 6.

The upper projecting portion 7 of the upper bottom seal bar 3 and the lower projecting portion 8 of the lower bottom seal bar 4 seal the bottom seal of two bags in the left-right direction in the figure so as to seal the bottom seal of two bags. A shape is provided, and a continuous belt-like body and bottom material are intermittently fed in the left-right direction to seal the bottom seal for two bags.

  FIG. 4 is an explanatory view schematically showing the bottom seal heating unit, to which the standing pouch bottom seal bar 100 of this example is attached, in front. In the bottom seal heating part, a lower bottom seal bar 4 is fixed to the lower heater block 2a, and a lower projection 8 corresponding to the bottom seal shape is integrally provided at the center of the lower bottom seal bar 4. ing. On both outer sides of the lower projection 8, warp prevention projections 6 are provided, respectively.

  Further, an upper bottom seal bar 3 is fixed to the upper heater block 2b, and an upper protrusion 7 is integrally formed at the center of the upper bottom seal bar 3 in accordance with the bottom seal shape. On both outer sides of the upper projection 7, warp prevention projections 6 are provided, respectively.

  The warp prevention protrusions 6 provided on the upper bottom seal bar 3 and the warp prevention protrusions 6 provided on the lower bottom seal bar 4 are provided at opposing positions, and face each other when performing bottom sealing. It is arranged to hit in position.

  The height of the warp prevention protrusion 6 is the sum of the height of the upper protrusion 7 of the upper bottom seal bar 3 and the height of the lower protrusion 8 of the lower bottom seal bar 4 and the warp prevention of the upper bottom seal bar 3. Any height can be used as long as it is equal to the sum of the height of the projection 6 and the height of the warp prevention projection 6 of the lower bottom seal bar 4 (the height is the same as that of the heater block 2b of the upper bottom seal bar 3). The height from the surface in contact with the heater block 2a of the lower bottom seal bar 4).

  Further, the height of the warp preventing protrusion 6 is ± 0. 0 compared with the height of the upper protrusion 7 of the upper bottom seal bar 3 or the height of the lower protrusion 8 of the lower bottom seal bar 4. It is preferably within 02 mm.

  Further, the upper heater block 2b is fixed to the two right and left pressure beams 1 in the figure, and the pressure beam 1, the upper heater block 2b, and the upper bottom seal bar 3 are connected to the upper side of the pressure beam 1. By moving up and down by a vertical movement device such as a cylinder, the body and bottom material of a continuous belt sandwiched between the upper bottom seal bar 3 and the lower bottom seal bar 4 are sealed, and the bottom seal portion is sealed. Form.

  When the bottom seal is formed on the continuous belt-like body material and bottom material, the warp prevention protrusion 6 is positioned at the position of the pouch that is bottom-sealed and the side seal portion of the unsealed pouch at another position or The bottom seal portion is preferable.

  Particularly preferably, it is provided so as to contact a position including a boundary portion between a portion where two body members and a folded bottom member are sealed and a portion where two body members are sealed.

  In order to provide the warp prevention protrusion 6 on the seal bar, the upper protrusion 7 or the lower side of the upper bottom seal bar 3 or the lower bottom seal bar 4 is cut to form a block-shaped metal before processing to match the bottom seal shape. It may be cut and provided in the same manner as the protrusion 8 is provided.

  Also, screw holes or simple holes formed in the upper bottom seal bar 3 or the lower bottom seal bar 4 on the upper bottom seal bar 3 or the lower bottom seal bar 4 provided with the upper projection 7 or the lower projection 8 are provided. Further, the warp preventing protrusion 6 provided with a screw or rod-shaped insertion portion may be mechanically fixed.

FIG. 5 is an explanatory view schematically showing another example of the bottom seal bar for a standing pouch according to the present invention. The standing pouch bottom seal bar 200 of this example is composed of an upper bottom seal bar 3 and a lower bottom seal bar 4 in the same manner as the standing pouch bottom seal bar 100 described above. At the center of the upper bottom seal bar 3, an upper protrusion 7 is integrally provided in accordance with the bottom seal shape. Also, a lower projection 8 is integrally provided at the center of the lower bottom seal bar 4 so as to match the shape of the bottom seal.

  And, on the outside of the upper projection 7 of the upper bottom seal bar 3 (on both sides in the longitudinal direction of the upper bottom seal bar 3), two warp prevention projections 6 are provided at both end portions in the width direction of the upper bottom seal bar 3, A total of four are provided and come into contact with the warp preventing protrusion 6 of the upper bottom seal bar 3.

  In addition, the warp prevention protrusions 6 are also formed on the outer sides of the lower protrusions 8 of the lower bottom seal bar 4 (both sides in the longitudinal direction of the lower bottom seal bar 4). Two pieces are provided at each end portion, for a total of four pieces. By doing in this way, since the height of each curvature prevention protrusion 6 can be adjusted, the hit at the time of sealing can be adjusted finely. Further, more warp preventing protrusions 6 may be provided.

  As described above, the standing pouch bottom seal bars 100 and 200 according to the present invention have the warp prevention protrusion when the upper protrusion 7 and the lower protrusion 8 are in contact with each other and when a load is applied from the pressure beam 1. 6 and the upper protrusion 7 and the lower protrusion 8 are in contact with each other, the warpage of the upper protrusion 7 and the lower protrusion 8 is suppressed, and the contact with the seal surface can be improved.

100, 200: Standing pouch bottom seal bar 1 ... Pressing beam 2a ... Lower heater block 2b ... Upper heater block 3 ... Upper bottom seal bar 4 ... Lower bottom seal Bar 5 ... Gap 6 ... Warp prevention protrusion 7 ... Upper protrusion 8 ... Lower protrusion

Claims (5)

  A bottom seal bar for a standing pouch of a standing pouch bag making machine that performs bottom sealing, comprising an upper bottom seal bar and a lower bottom seal bar, and an upper side that matches the shape of the bottom seal at the center of the upper bottom seal bar A protrusion is provided, a protrusion for preventing warpage is provided on the outside of the upper protrusion, and a lower protrusion corresponding to the shape of the bottom seal is provided at the center of the lower bottom seal bar. A bottom seal bar for a standing pouch, characterized in that a warp preventing protrusion is provided on the outside of the side protrusion so as to abut against the warp preventing protrusion of the upper bottom seal bar.   When the bottom seal is formed on the continuous belt-like body material and bottom material, the position of the warp preventing projection is determined by two pouches: a pouch where the bottom is sealed and an unsealed pouch at another position. The standing according to claim 1, wherein the standing is provided so as to hit a position including a boundary portion between a portion where the body material and the folded bottom material are sealed and a portion where only the two body materials are sealed. Pouch bottom seal bar.   The standing pouch bottom seal bar according to claim 1, wherein the warp preventing protrusion is provided by cutting a seal bar.   The standing pouch bottom seal bar according to claim 1, wherein the warp preventing protrusion is mechanically fixed to the seal bar.   2. The warp preventing projections are provided on the outside of the upper projection, and the warp preventing projections are provided on the outside of the lower projection. 5. A bottom pouch for a standing pouch according to any one of items 1 to 4.