JPH066013Y2 - Mandrel device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a mandrel device for use in a tubular blank sterilizer for paper containers containing milk or juice, which is generally called a Gobeltop type.

[Prior Art] FIG. 5 shows a Gobel-top type paper container 1. This container 1 is formed by sterilizing a cylindrical blank having a fixed length with both ends opened, and then heating, provisionally folding, and sealing the bottom 2 to form a flat bottom. After this, the required beverage is filled and the upper part 3 is formed into a gabled shape to complete the container 1.

The sterilization step is generally performed by spraying a sterilizing solution on the inner and outer peripheral surfaces of the blank. Furthermore,
In the case of a brick-shaped container, the packaging material is formed into a long strip shape, and this strip-shaped packaging material is immersed in a container containing a sterilizing solution to sterilize it.

[Problems to be solved by the invention] However, in the sterilization by spraying the sterilizing solution, the spraying of the sterilizing solution may be non-uniform or the amount of spray may be insufficient. In this case, sterilization failure may occur. . On the other hand, when the blank is immersed in a sterilizing solution, the fear of sterilization failure is eliminated, but in the case of a Goebeltop type container, the blank needs to be molded into an independent cylindrical shape, Therefore, it is not easy to remove this sterilizing liquid after soaking it in the sterilizing liquid.

For this reason, a method has been developed in which a nozzle device is attached to the tip of a mandrel and the germicide is removed by compressed air ejected from the nozzle device.

As shown in FIG. 7 and FIG.
Has a base member 13 mounted on a mandrel 10b also serving as an air supply pipe through an air hole b, and a cap member 14, both of which are inserted into the mounting hole a with a slight gap therebetween. They are fixed to each other with the bolts. The base member 13 has a quadrangular pyramid-shaped recess 13a, and the quadrangular pyramid-shaped protrusion 14a of the cap member 14 is inserted into the recess 13a to form a gap formed between the recess 13a and the protrusion 14a. Thereby, the air ejection nozzle 12a is formed. Air is ejected from the nozzle 12a to remove the germicide from the inner surface of the blank.

However, this nozzle device, as shown in FIG.
Since 3a and the protrusion 14a are formed in a quadrangular pyramid shape,
The diagonal injection angle α and the vertical or horizontal injection angle β are different from each other. Further, the air flow becomes discontinuous at the corners of the quadrangular pyramid. Therefore, the disinfectant cannot be removed uniformly, and there is a problem in removing the disinfectant especially at the corners of the blank.

The present invention has been made in view of the above, and an object thereof is to provide a mandrel device capable of efficiently removing a sterilizing solution from a cylindrical blank immersed in the sterilizing solution.

[Means for Solving the Problems] The mandrel device according to the present invention comprises a mandrel to be inserted into a hollow prismatic blank for a beverage container, a base member having a short prism shape attached to the tip of the mandrel, and the base member. And a nozzle device including a cap member that forms an air jet nozzle, and the base member has an air supply hole, and the air supply hole is opened in the bottom wall,
A short cylinder having a recess opening in the distal direction and a conical surface formed on the outer periphery of the recess, the cap member being inserted into the recess and forming an air chamber between the cap member and the peripheral wall of the recess. -Shaped insertion portion, a diagonal air guide groove formed in the insertion portion, which communicates the air chamber with the supply hole, and a conical surface of the base member, which face each other with a predetermined gap, and an air ejection port. And a conical guide surface for forming air to eject air uniformly from the air ejection port.

[Operation] According to the mandrel device of the present invention, the nozzle device forms an air chamber between the base member and the cap member, and the conical surface of the base member and the guide surface of the cap member are provided on the outer peripheral portion of the air chamber. The formed gap is formed, and this gap forms an air ejection nozzle. This air ejection nozzle has no corners and ejects air uniformly.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

[Embodiment] FIG. 5 shows a sterilizer 5 using a mandrel device according to an embodiment of the present invention. This sterilizer is used in the aseptic filling and packaging machine for filling and packaging the Goebel top type container 1 shown in FIG.

The sterilizer 5 has a sterile chamber 6, to which a hollow prismatic blank 4 having both ends opened is supplied from an inlet portion 5a on the right side of the drawing through an appropriate sheet feeding mechanism,
The blank 4 which has been sterilized is sent to the next step from the outlet 5b. Further, the sterilizing device 5 has a sterilizing agent tank 7 containing, for example, hydrogen peroxide solution, and a first circulating device 9. The first circulation device is intermittently rotated to sequentially immerse the blank 4 in the germicide tank 7. The blank 4 pulled up from the disinfectant tank 7 is attached to each mandrel device 10a radially arranged around the circumference of the mandrel mechanism 10, and while the mandrel mechanism is rotating, the blank 4 is blown by the air flow ejected from each mandrel. The bactericide is removed. After that, the blank 4 is circulated in the sterilizer removal tank 8 which blows hot air by the second circulation device 11 similar to the first circulation device 9. These circulation devices have a similar structure and have a pair of sprockets arranged above the sterilizer tank 7 and the sterilizer removal tank 8 and a pair of idlers arranged in each tank below (both. Is also not shown). A pair of transport chains having the same length are wound around these sprockets and idlers, and the lower ends of the chains are arranged in the disinfectant tank 7 and extend.
A blank holder for holding a blank is attached to the pair of chains.

1 to 4 show the nozzle device 15 of each mandrel device.

The nozzle device 15 includes a base member 16 attached to the mandrel 10b also used as the air supply pipe in FIG. 7, and a cap member 26 attached to the base member.

The base member 16 is formed in the shape of a short prism, and the container blank can be housed in the prismatic inner hole to hold the blank. The base member 16 has an air supply hole 1 in which a threaded portion that is screwed into the tip of the mandrel is formed in the peripheral portion.
8 in the center, and this air supply hole opens in the center of the bottom wall of the recess 17. The concave portion 17 is formed in a short cylindrical shape and opens downward, that is, on the side of the cap member 26,
A conical surface 20 is formed on the outer peripheral portion of the recess. The base member 16 is integrally coupled with the cap member 26 by a bolt 21 that is inserted through the bolt insertion hole 18.

The cap member 26 has a short cylindrical insertion portion 27 that is inserted into the recess 12 at the central portion facing the base member 16 side.
The insertion portion is formed with a screw hole 29 that is aligned with the bolt hole 19. The insertion portion 27 forms an air chamber 25 between itself and the side wall of the recess when inserted into the recess 17. Furthermore, the insertion portion 27 has two air guide grooves 28 along the diagonal direction of the base member 16 or the cap member 26, and these guide grooves are provided when the base member 16 and the cap member 26 are joined. The air chamber 25 and the air supply hole 18 communicate with each other.

In addition, an annular flat surface 27a formed on the peripheral portion of the recess 27
A conical guide surface 30 corresponding to the conical surface 20 is formed on the outer peripheral portion of the. The guide surface 30 opens outward through a gap when the base member 16 and the cap member 26 are integrally coupled, and forms a nozzle 15a for ejecting air together with the conical surface 20. Therefore, the nozzle 15a is inclined with respect to the traveling direction or the axial direction of the nozzle device, and is uniformly opened in its peripheral portion. In the present embodiment, the gap between the nozzles 15a is set to 0.5 mm, but it can be appropriately adjusted between the bottom wall of the recess 17 and the end of the insertion portion 27 depending on the application or need.

Similarly to the base member 16, the cap member 26 is also formed in a square shape that can be inserted corresponding to the inner hole of the hollow prismatic blank, and the end portion on the opposite side of the base member 16 is inside the inner hole of the blank. Tapered to facilitate insertion.

The mandrel device having the nozzle device 15 attached to the tip can uniformly eject air from the nozzle 15a at the tip to the peripheral portion. Therefore, when the blank after passing through the sterilization tank (Fig. 6) is inserted from the tip of the mandrel device, air is ejected from the nozzle 15a in a direction inclined with respect to the entering direction as the blank is inserted. It Since this nozzle device is formed in a square shape corresponding to the inner hole of the blank, air is uniformly blown to the inner surface of the blank, and the bactericide is efficiently removed.

When the blank is inserted into this mandrel device, the tip side of the mandrel device is inclined downward and the blank is inserted along this inclined mandrel device, whereby the bactericide can be removed more efficiently.

[Effect of the Invention] According to the present invention, air can be uniformly blown to the inner surface of the hollow prismatic blank that has passed through the sterilizing agent tank. Efficient removal eliminates uneven removal.

[Brief description of drawings]

1 is a perspective view of a nozzle device in a mandrel device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is an exploded perspective view of the nozzle device of FIG. 4, FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, FIG. 5 is a perspective view of a container formed from a blank, FIG. 6 is an explanatory view of a sterilizing device using a mandrel device, and FIG. FIG. 8 is an exploded perspective view of a conventional nozzle device, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 4 ... Blank, 5 ... Sterilizer, 7 ... Sterilizer tank, 1
0a ... mandrel device, 10b ... mandrel, 15
...... Nozzle device, 16 …… Base member, 17 …… Recess,
18 ... Air supply hole, 20 ... Conical surface, 25 ... Air chamber, 26 ... Cap member, 27 ... Insertion part, 28
...... Air guide groove, 30 ...... Guide surface.

Claims (1)

[Scope of utility model registration request] 1. A mandrel that is inserted into a hollow prismatic blank for a beverage container, a short prismatic base member that is attached to the tip of the mandrel, and a cap member that forms an air ejection nozzle together with the base member. And a nozzle device, wherein the base member is an air supply hole,
The air supply hole is opened in the bottom wall and has a concave portion that opens in the front end direction, and a conical surface formed on the outer peripheral portion of the concave portion, the cap member is inserted into the concave portion, and the peripheral wall of the concave portion is formed. A short cylindrical insertion portion forming an air chamber between the air chamber and a diagonal air guide groove formed in the insertion portion and connecting the air chamber with the supply hole, and a predetermined conical surface of the base member. And a conical guide surface that forms an air ejection port and faces each other with a gap therebetween, and ejects air uniformly from the air ejection port.