JPS6119508B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for heating and deforming the lower part of a pilfer-proof band of a container lid fitted over the neck and neck of a container.

For example, Japanese Patent Laid-Open Publication No. 1983-1981 discloses a container lid having so-called pilfer-proof property (property to prevent tampering such as refilling of contents) for a container lid such as a beverage bottle.
As disclosed in Japanese Patent No. 8284, it has a top wall and a cylindrical skirt wall that hangs down from the periphery of the top wall, and a pilfer-proof zone is defined at the lower end of the skirt wall. A container lid has been proposed in which the proof band is made of thermoplastic synthetic resin. As disclosed in the above-mentioned Japanese Patent Laid-Open No. 53-8284, such a container lid is fitted onto the mouth and neck of the container, and then the lower part of the pilfer-proof band is heated to deform it inward, and the opening is closed. It is attached to the mouth and neck as required by being locked to the locking surface formed on the outer peripheral surface of the neck.

As a device for heating the lower part of the pilfer-proof band of the container lid and deforming it inward, the inventors of the present invention previously proposed patent application no.
No. 152146 (filing date: September 28, 1980, title of invention: device for heating and deforming the lower part of the pilfer-proof zone of a container lid) In the specification and drawings,
(a) a conveyance mechanism for conveying a container with a container lid fitted to the mouth and neck through a predetermined path; a shielding hood surrounding at least both sides and above the upper end of the container to be transported, and (c) one of the containers being transported within the shielding hood and through the heating and deforming region upstream of the heating and deforming region; at least one first jet orifice located on the side and at least one first jet orifice located on the other side of the container conveyed in the shielding hood and through the heat deformation region downstream of the heat deformation region; We have proposed a device equipped with a heated gas flow injection mechanism having two injection ports. In such a device, while the container is transported through the heating deformation region by the transport mechanism, the heated gas flow injected from the first injection port and the second injection port is fitted into the neck of the container. It acts on the lower part of the pilfer-proof band in the container lid, heats it and deforms it inward.

In addition to being simpler and cheaper than conventional devices, the above device proposed by the present inventors has the following advantages:
The lower part of the pilfer-proof strip can be heated and deformed inward at a considerably higher speed than conventional devices. However, it is still not completely satisfactory, as will be explained in more detail below, especially when a relatively large amount of heat must be applied to the lower part of the pilfer-proof zone to cause it to deform. It was found that the lower part tends to be uneven in the circumferential direction.

The present invention has been made in view of the above facts, and its main purpose is to solve the above-mentioned problems in the above-mentioned device previously proposed by the present inventors.

According to the present invention, the lower part of the pilfer-proof band made of thermoplastic synthetic resin, which is present at the lower part of the cylindrical skirt wall of the container lid fitted over the neck of the container, is heated to deform inwardly, and the neck of the container is heated. (a) for locking to the locking surface formed on the outer peripheral surface of the
a transport mechanism for transporting the container with the container lid fitted onto the mouth and neck through a predetermined route; (b) disposed in a heating deformation region located along the predetermined route;
(c) a shielding hood surrounding both sides and above at least the upper end of the container that is conveyed through the heat-deforming region; at least one first jet orifice located on one side of the container conveyed downstream of the heat deformation zone in the shielding hood and through the heat deformation zone; a heated gas flow injection mechanism having at least one second injection port; the heating effect of the lower part of the pilfer-proof zone by the heated gas flow injected from the first injection port; ,
The heating effect of the lower part of the pilfer-proof zone by the heated gas flow injected from the second injection port is made greater, thus making the heating deformation of the lower part of the pilfer-proof zone uniform in the circumferential direction. An apparatus is provided which is characterized in that:

A more detailed explanation will be given below with reference to the accompanying drawings.

First, an example of an object to be treated by the apparatus improved according to the present invention, namely a container and a container lid fitted over the mouth and neck of the container, will be described with reference to FIG. The container 2, which can be made of glass or a suitable synthetic resin, has a neck part 4 at its upper end (FIG. 1 shows only the upper end of the container 2, that is, the neck part 4). Illustrated mouth and neck 4
has a cylindrical shape with an open upper end, and a male thread 6 is formed on its outer peripheral surface. Further, an annular protrusion 8 is formed on the outer circumferential surface of the mouth and neck portion 4 and extends continuously in the circumferential direction and is located below the male thread 6. The lower surface 8a of this annular protrusion 8 is Thus, a locking surface is defined to which the lower part of the pilfer-proof band of the container lid is locked.

On the other hand, the entire body fitted into the mouth and neck part 4 is numbered 1.
The illustrated container lid indicated by 0 is entirely made of a suitable thermoplastic synthetic resin such as polyethylene or polypropylene, and includes a circular top wall 12 and a cylindrical skirt wall 14 depending from the periphery of the top wall 12.
and has. It is desirable that an annular seal portion 16 of an appropriate shape to be engaged with the edge portion of the mouth and neck portion 4 is formed on the inside of the top wall 12. If desired, an annular seal 16 may be provided on the inside of the top wall 12.
Instead of being integrally formed, a separate packing member formed in an appropriate shape may be disposed inside the top wall 12. On the other hand, skirt wall 1
4 is formed with a weakened line 18 extending in the circumferential direction, and the skirt wall 14 has a relatively thick main part 20 located above the weakened line 18 and a relatively thin main part 20 located below the weakened line 18. It is divided into a pilfer-proof zone 22 and a pilfer-proof zone 22. The weakened line 18 itself can be defined by a so-called score, etc., in which the material thickness is reduced, but in the illustrated case, the weakened line 18 is defined by a plurality of slits 24 extending in the circumferential direction at intervals in the circumferential direction. slit 24
The pilfer-proof zone 22 is connected to the main portion 20 by the plurality of bridges 26 located therebetween. A female thread 28 is formed on the inner circumferential surface of the main portion 20 and is screwed into a male thread 6 formed on the outer circumferential surface of the mouth and neck portion 4 . Further, it is convenient that the outer peripheral surface of the main portion 20 is formed with knurling or unevenness 30 so that the container lid 10 can be surely and easily gripped and rotated with fingers.

Such a container lid 10 is attached to the mouth and neck part 4 in the following manner. The container lid 10 is fitted onto the mouth and neck portion 4, and in the illustrated case, the container lid 10 is rotated clockwise when viewed from above in FIG. In this way, the female thread 28 formed on the container lid 10 is screwed into the male thread 6 formed on the neck part 4, and the container lid 10 is moved downward in the axial direction as it rotates, and the opening neck part 4 is moved downward in the axial direction. Container lid 1 for 4
0 is positioned as shown in FIG. In the state shown in FIG.
An annular seal portion 16 formed inside the top wall 12 of 0 is engaged with the edge portion of the mouth and neck portion 4 with a required pressure, thus sealing the mouth and neck portion 4. In addition, in the specific example shown, as can be understood from FIG. It is brought into contact with or close to 8b. After that, the first container lid 10 is attached to the mouth and neck part 4.
A container 2 fitted in the condition as shown in the figure is processed by the apparatus improved according to the invention as described below, and thus the pill flange in the container lid 10 as shown in FIG. Proof band 2
The lower part of 2 is deformed inward and is locked to the lower surface of the annular protrusion 8 formed on the mouth and neck part 4, that is, the locking surface 8a.

Referring now to FIGS. 3 and 4, which illustrate one embodiment of an improved apparatus in accordance with the present invention, the illustrated apparatus includes a transport mechanism having an endless transport belt 32. (Only a portion of the upper running portion of the endless conveyor belt 32 is shown in FIGS. 3 and 4). Endless conveyor belt 32 is driven in the direction indicated by arrow 34 by a suitable drive source (not shown) such as an electric motor. Mouth and neck 4
The container 2 with the container lid 10 fitted thereon is placed in an upright state on the substantially horizontally extending upper running portion of the endless conveyor belt 32, and thus moves along a predetermined path as the endless conveyor belt 32 moves. (ie, the path defined by the substantially horizontally extending upper run of the endless conveyor belt 32) in the direction indicated by arrow 34. As shown in FIG. 3, a heating deformation region 36 is arranged along the path of the container 2 transported by the endless transport belt 32. As shown in FIG. If desired, as disclosed in the above-mentioned Patent Application No. 152146 and drawings, a liquid application area where a liquid, which may be water, is injected onto the container lid 10 fitted over the mouth and neck 4 as a pretreatment. (not shown) can be arranged upstream of the heating deformation region 36 along the path of the container 2. The configuration in this liquid application area may be substantially the same as the configuration disclosed in the specification and drawings of the above-mentioned Patent Application No. 152146 of 1982, so the description thereof will be omitted in this specification.

The heating deformation area 36 includes an endless conveyor belt 3
A shielding hood 38 located above the upper running part of 2
is provided. The illustrated shield hood 38, which is supported in position by suitable support means (not shown), has a top wall 40 and side walls 42 and 44 depending from opposite edges of the top wall 40. The top wall 40 and both side walls 42 and 44 extend along the path of the container 2 conveyed by the endless conveyor belt 32, and extend at least at the upper end of the container 2 conveyed through the heating deformation region 36 (i.e., when the container lid 10 is It surrounds both sides and above of the mouth and neck part 4) that is fitted. In the illustrated embodiment, the side walls 42 and 44 of the shield hood 38 depend downwardly to a level near the lower end of the container 2, such that the shield hood 38 surrounds the top of the container 2 and substantially the entirety of the container on both sides. It's bending.

The heating deformation region 36 is further provided with a heated gas flow injection mechanism. The heated gas flow injection mechanism in the illustrated embodiment includes a pair of heated gas flow injection nozzles 48 and 50. One 48 of the pair of heated gas flow injection nozzles 48 and 50 is connected to the shielding hood 3 at the upstream portion 36a of the heating deformation region 36.
8 and protrudes into the shield hood 38 through one of the side walls 42 and 44 of the shield hood 38 . The projecting end of the heated gas jet nozzle 48 located on one side (the right side in FIG. 4) of the container 2 that is conveyed through the upstream portion 36a of the heat deformation region 36 is provided with the heat deformation region 36. One or more injection ports 52 are formed, which are advantageously elongated in shape and extend along the transport path of the container 2 being transported through the upstream section 36a. The other 50 of the pair of heated gas flow injection nozzles 48 and 50 is connected to the shielding hood 3 at the downstream portion 36b of the heating deformation region 36.
8 and protrudes into the shielding hood 38 through the other side walls 42 and 44 of the shield hood 38 . The projecting end of the heated gas jet nozzle 50 located on the other side (the left side in FIG. 4) of the container 2 conveyed through the downstream portion 36b of the heating deformation area 36 is provided with the heating deformation area 36. One or more injection ports 54 are formed, which are advantageously elongated in shape and extend along the transport path of the container 2 being transported through the downstream section 36b. Each of the pair of heated gas stream injection nozzles 48 and 50 is connected to a source of air (not shown) via a suitable duct 56 and 58 (FIG. 3). Ducts 56 and 5
Disposed within each of 8 are heaters 60 and 62, which may for example be of the type having electrical resistance heating wires, for heating the gas flow passing therethrough. A gas flow, which may for example be an air flow, from a blowing source (not shown) is directed through ducts 56 and 58 to heated gas flow injection nozzles 48 and 50, where it is heated by heaters 60 and 62. heated.
The heated gas flow is then injected from the injection ports 52 and 54 of the heated gas flow injection nozzles 48 and 50.

In the illustrated embodiment, there is further provided a pair of guides projecting from the inner surfaces of the side walls 42 and 44 of the shield hood 38, opposite the injection ports 52 and 54 of the pair of heated gas flow injection nozzles 48 and 50, respectively. Plates 64 and 66 are provided. That is, in the upstream portion 36a of the heat deformation region 36, the guide plate 64 protrudes substantially horizontally from the inner surface of the other side wall 44 of the side walls 42 and 44 of the shield hood 38, and in the downstream portion 36b of the heat deformation region 36, the guide plate 64 hood 38
A guide plate 66 projects substantially horizontally from the inner surface of one of the side walls 42 and 44.

In the apparatus as described above, when the container 2 with the container lid 10 fitted to the neck and neck portion 4 is conveyed through the heat deformation region 36, the heated gas flow injection nozzle 48 is installed in the upstream portion 36a of the heat deformation region 36.
The heated gas flow injected from the injection port 52 acts on the pilfer-proof zone 22 of the container lid 10. More specifically, as shown in FIG.
A portion of the heated gas flow injected from the container lid 10
The injection port 5 of the pilfer-proof zone 22 of
Most of the heated gas flow injected from the injection port 52 hits the outer surface of the part located on the second side, especially the lower outer surface, and heats this part. , is directed to the part located opposite the injection port 52, especially its lower part. The inner surface of the portion of the pilfer-proof zone 22 located on the opposite side of the injection port 52,
In particular, the part that collides with the inner surface of the lower part heats up.
The heated gas flow passing through the front and rear of the container lid 10 also flows through the upper wall 40 and side wall 4 of the shielding hood 38.
4, and then flows along the guide plate 64, etc., so that the pilfer-proof zone 22
The outer surface of the portion located on the opposite side of the injection port 52, particularly the lower outer surface, is collided with and heated. Thus, the upstream side 36 of the heated deformation region 36
In a, the lower part of the pilfer-proof zone 22 located mainly on the opposite side of the injection port 52 is heated by the heated gas flow from the injection port 52, and is thereby softened and softened. It is deformed inward by the action of residual stress caused by molecular orientation during molding, and is locked to the locking surface 8a formed in the mouth and neck portion 4.

On the other hand, in the downstream portion 36b of the heating deformation region 36, the heated gas flow injected from the injection port 54 of the heated gas flow injection nozzle 50 acts on the pilfer-proof zone 22 of the container lid 10. More specifically, as shown in FIG. 6, a portion of the heated gas flow injected from the injection port 54 is directed toward the outer surface of the portion of the pilfer-proof zone 22 of the container lid 10 located on the injection port 54 side. , in particular impinges on the lower outer surface and heats that part, but most of the heated gas flow injected from the nozzle 54 is directed to the opposite side of the nozzle 54 of the pilfer-proof zone 22 of the container lid 10. Directed to the part where it is located, especially its lower part. Then, it collides with the inner surface of the portion of the pilfer-proof zone 22 located on the opposite side of the injection port 54, particularly the lower inner surface, and heats this portion. In addition, the container lid 10
The heated gas flow passing through the front and rear sides of the pilfer-proof zone 22 impinges on the inner surfaces of the top wall 40 and side wall 42 of the shielding hood 38, and then flows along the guide plate 66, etc. , collides with the outer surface of the portion located on the opposite side of the injection port 54, particularly the lower outer surface, and heats this portion. Thus, on the downstream side 36b of the heating deformation region 36, the lower part of the pilfer-proof zone 22, which is located mainly on the opposite side of the injection port 54,
heated by the heated gas flow from the injection port 54;
As a result, it is softened and deformed inward by the action of residual stress caused by molecular orientation during molding, and is locked to the locking surface 8a formed in the mouth and neck portion 4.

Therefore, the configuration and operation as described above in the specific example shown in the drawings are substantially the same as the device disclosed in the specification and drawings of Patent Application No. 152146 of 1982, which the present inventors had previously proposed. Same as above, but
In the device previously proposed by the present inventors, the heating deformation of the lower part of the pilfer-proof zone 22 of the container lid 10 after passing through the heating deformation region 36 tended to be uneven. To explain this point in more detail, in the device previously proposed by the present inventors, the lower part of the pilfer-proof zone 22 is The heating effect on the portion opposite to the injection port 52 and the portion on the injection port 52 side, and the downstream portion 36b of the heating deformation region 36
The heating effect of the heated gas flow injected from the injection port 54 on the lower portion of the pilfer-proof zone 22 on the opposite side to the injection port 54 and the portion on the injection port 54 side are made to be substantially the same. Ta. However, the upstream portion 36a of the heating deformation region 36
, an unheated container lid 10 passes through, and the lower part of the pilfer-proof zone 22 of the container lid 10 is heated by the heated gas flow from the injection port 52. On the other hand, heating deformation region 3
6, the container lid 10 that has already been partially heated on the upstream side 36a passes through, and the pilfer-proof zone 2 of the container lid 10 passes through the downstream portion 36b of the container lid 10.
The lower part of 2 is further heated by the heated gas flow from the injection port 54. Therefore, while passing through the upstream part 36a and downstream part 36b of the heating deformation region 36,
The amount of heat given to the lower part of the pilfer-proof zone 22, which is heated mainly in the upstream part 36a, on the opposite side of the injection port 52 (on the injection port 54 side) is relatively small;
The amount of heat given to the portion on the opposite side of the injection port 54 (on the injection port 52 side) that is heated in step b becomes relatively large. Therefore, especially when a relatively large amount of heat must be applied to heat and deform the lower part of the pilfer-proof zone 22 as desired, the lower part of the pilfer-proof zone 22 at the injection port 52 is The portion on the opposite side (the injection port 54 side) tends to be insufficiently heated and deformed, and the portion opposite to the injection port 54 (the injection port 52 side) tends to be excessively heated and deformed.

In order to solve the above-mentioned problems found in the devices previously proposed by the present inventors, in the device improved according to the present invention, the heating deformation region 36
The heating effect of the lower part of the pilfer-proof zone 22 by the heated gas flow injected from the injection port 52 in the upstream part 36a of the heating deformation region 36 is
6b, the heating effect of the lower part of the pilfer-proof zone 22 by the heated gas flow injected from the injection port 54 is made greater, and thus, while passing through the upstream part 36a and the downstream part 36b of the heating deformation region 36, the pilfer-proof zone 22 is heated. The amount of heat applied to the lower part of the proof zone 22 is made sufficiently uniform over the entire circumferential direction.

In the illustrated embodiment, a heater 60 is provided in association with the heated gas stream injection nozzle 48.
The heating capacity of the heated gas stream injection nozzle 48 is made larger than the heating capacity of the heater 62 provided in association with the heated gas stream injection nozzle 50, so that the heated gas stream injection nozzle 48 is The temperature t ₁ of the heated gas flow injected from the injection port 52 of the heated gas flow injection nozzle 50 is higher than the temperature t ₂ of the heated gas flow injected from the injection port 54 of the heated gas flow injection nozzle 50 in the downstream portion 36b of the heating deformation region 36. (t ₁
>t ₂ ) It is forced.

In addition, in the illustrated example, as can be easily understood by referring to FIGS. 5 and 6 together with FIG. The height of the injection port 54 of the heated gas flow injection nozzle 50 is higher than the height of the guide plate 64.
The height of the guide plate 66 disposed opposite to the injection port 52 is made lower.
The collision state of the heated gas flow injected from the lower part of the pilfer-proof zone 22 and the injection port 54
The impingement state of the heated gas stream injected from the pilfer-proof zone 22 against the lower part of the pilfer-proof zone 22 is different. More specifically, as can be easily understood by comparing and referring to FIGS. 5 and 6, the spray is ejected from the injection port 52 at the upstream portion 36a of the heating deformation region 36 to the upper wall 4 of the shielding hood 38.
0 and the inner surface of the side wall 44, the guide plate 64
Compared to the degree of concentration of the heated gas flow that is guided to the lower outer surface of the portion of the pilfer-proof zone 22 located on the opposite side of the injection port 52, the injection port is 54 and collides with the inner surfaces of the upper wall 40 and side wall 42 of the shielding hood 38, and is guided by the guide plate 66 to the injection port 54 of the pilfer-proof zone 22.
The concentration of the heated gas flow directed to the lower outer surface of the portion opposite the is reduced.

Furthermore, in the illustrated example, as shown in FIG. 3, the shielding hood 38 extends further upstream than the upstream portion 36a where the injection port 52 is located, and the shielding hood 38 extends further upstream from the upstream portion 36a where the injection port 54 is located. Downstream section 36b
It has been extended further downstream. Upstream extension 38a and downstream extension 38 of shielding hood 38
b maintains the ambient temperature of the upstream portion 36a and downstream portion 36b of the heating deformation region 36, thereby reducing the difference in ambient temperature between the two. Further, due to the presence of the upstream extension portion 38a of the shielding hood 38, the container lid 10
is preheated to some extent before entering the upstream portion 36a of the heating deformation region 36.

FIG. 7 shows the injection port 52 when passing through the upstream portion 36a and downstream portion 36b of the heating deformation region 36 in the illustrated example with the above-mentioned improvements.
A heated gas flow of temperature t ₁ injected from the injection port 54
The pilfer-proof zone 22 of the container lid 10 is heated by a stream of heated gas at a temperature t ₂ injected from the
Four locations at the bottom of An example of a temperature change in a portion D located on the injection port 52 side is shown. As can be understood by referring to such FIG. According to the device improved according to the present invention, the heating effect of the lower part of the pilfer-proof zone 22 by the heated gas flow injected from the injection port 54 at the downstream portion 36b of the heating deformation region 36 is made greater. Upstream portion 36a of heating deformation region 36
The amount of heat given to the lower part of the pilfer-proof zone 22 can be made sufficiently uniform over the entire circumferential direction while passing through the downstream portion 36b. It can be heated and deformed sufficiently uniformly over the entire length, and can be locked to the locking surface 8a of the mouth and neck portion 4 as required.

Degree of difference between the heating effect of the lower part of the pilfer-proof zone 22 due to the heated gas flow injected from the injection port 52 and the heating effect of the lower portion of the pilfer-proof zone 22 due to the heated gas flow injected from the injection port 54 Therefore, in the illustrated example, the degree of difference between the temperature t ₁ of the heated gas flow injected from the injection port 52 and the temperature t ₂ of the heated gas flow injected from the injection port 54, and the guide plate 64 The difference in height between the guide plate 66 and the pilfer-proof band 22 of the container lid 10 is
material and dimensions of the lower part of and the heat deformation area 36
It may be set appropriately based on the conveyance speed of the container 2 through which the container 2 is conveyed.

On the other hand, in order to make the heating effect of the lower part of the pilfer-proof zone 22 by the heated gas flow injected from the injection port 52 greater than the heating effect of the heating gas flow of the pilfer-proof zone 22 injected from the injection port 54, the heating effect shown in the figure is In the specific example, the temperature t ₁ of the heated gas flow injected from the injection port 52 and the temperature t ₂ of the heated gas flow injected from the injection port 54 are made different, and the guide plate 64 and the guide plate 66 are By making the heights different, the heated gas flow injected from the injection port 52 collides with the lower part of the pilfer-proof zone, and the heated gas flow injected from the injection port 54 collides with the lower part of the pilfer-proof zone. However, if desired, instead of or in addition to these, for example, the flow rate of the heated gas flow injected from the injection port 52 and the heated gas flow injected from the injection port 54 may be changed. By employing other suitable methods such as making the flow rate of the gas flow different, or making the position and/or angle of the injection port 52 different from the position and/or angle of the injection port 54, The heating effect of the lower part of the pilfer-proof zone 22 due to the heated gas flow injected from the injection port 52 is as follows.
It is also possible to make the heating effect greater than the heating effect of the lower part of the pilfer-proof zone 22 due to the heated gas flow injected from the injection port 54.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an example of a container and a container lid fitted over the mouth and neck of the container before being processed by the apparatus improved according to the present invention. FIG. 2 is a partially cut-away section showing the state of the container shown in FIG. 1 and the container lid fitted over the mouth and neck after being processed by the apparatus improved according to the present invention. Side view. FIG. 3 is a partial plan view showing an example of an improved device according to the present invention.
FIG. 4 is a sectional view taken along the line - in FIG. 3. FIG. 5 is a sectional view taken along the line - in FIG. 3. 6th
The figure is a sectional view taken along the line - in FIG. 3. FIG. 7 is a diagram illustrating an example of temperature changes in various parts of the lower part of the pilfer-proof zone of the container lid during passage through the upstream and downstream parts of the heating deformation zone of the apparatus shown in FIG. 3; 2... Container, 4... Mouth and neck of container, 10... Container lid, 22... Pilf-proof band of container lid,
32... Endless conveyance belt (conveyance mechanism), 36...
Heat deformation region, 36a...upstream part of heat deformation region, 36b...downstream part of heat deformation region, 38...
Shielding hood, 48 and 50...Heated gas flow injection nozzle (heated gas flow injection mechanism), 52 and 54...
Injection ports, 64 and 66...information board.

Claims (1)

[Claims] 1. In a container lid fitted over the mouth and neck of a container, the lower part of a pilfer-proof band made of thermoplastic synthetic resin existing at the lower part of a cylindrical skirt wall is heated to deform inwardly, (b) a conveyance mechanism for conveying the container with the container lid fitted onto the neck through a predetermined path, for locking the container to a locking surface formed on the outer peripheral surface of the neck; ) a shielding hood disposed in a heating deformation area located along the predetermined path and surrounding at least both sides and above the upper end of the container conveyed through the heating deformation area; and (c) the heating deformation area at least one first jet orifice located on one side of the container conveyed within the shielding hood and through the heated deformation region upstream of the container;
at least one second jet orifice located downstream of the heat deformation region within the shield hood and on the other side of the container conveyed through the heat deformation region. In an apparatus for: heating the lower part of the pilfer-proof zone by the heated gas flow injected from the first injection port,
The heating effect of the lower part of the pilfer-proof zone by the heated gas flow injected from the second injection port is made greater, thus making the heating deformation of the lower part of the pilfer-proof zone uniform in the circumferential direction. A device featuring: 2 The temperature (t ₁ ) of the heated gas flow injected from the first injection port is higher than the temperature (t ₂ ) of the heated gas flow injected from the second injection port (t ₁ >t ₂ ). An apparatus according to claim 1. 3. The collision state of the heated gas flow injected from the first injection port against the lower part of the pilfer-proof zone, and the collision state of the heated gas flow injected from the second injection port with the lower part of the pilfer-proof zone. The device according to claim 1 or 2, wherein the collision state is different from that of the device. 4. The shielding hood includes an upper wall extending along the predetermined path above the container being conveyed through the heating deformation area, both side walls hanging down from both side edges of the upper wall, and an upstream portion of the heating deformation area. The heating gas flow protrudes substantially horizontally from the inner surface of one side wall of the both side walls facing the first injection port, and is injected from the first injection port and impinges on the upper wall and the one side wall. a first guide plate for directing it toward the lower part of the pilfer-proof zone; and a substantially horizontal guide plate from the inner surface of the other side wall facing the second injection port of the both side walls at the downstream part of the heating deformation area. protruding into the second
a second guide plate for directing the heated gas flow injected from the injection port and colliding with the upper wall and the other side wall to the lower part of the pilfer-proof zone, the first guide plate and the the concentration of the heated gas flow directed toward the lower part of the pilfer-proof zone by the first guide plate and the second guide plate; 4. The apparatus of claim 3, wherein the concentration of the heated gas stream directed to the lower part of the pilfer-proof zone is varied by the pilfer-proof zone. 5. The shielding hood includes an upstream extension extending upstream from the area where the first injection port is located and/or a downstream extension extending downstream from the area where the second injection port is located. An apparatus according to any one of claims 1 to 4.