JP6712467B2 - Packaging container with rupture structure - Google Patents

Description

The present invention relates to a packaging container capable of accommodating, transporting, storing, and displaying a product, and more specifically, when a packaging container that is no longer needed due to consumption of the contained product is discarded, the amount is reduced. The present invention relates to a packaging container having a rupture structure that has been subjected to a process that facilitates flat crushing in order to reduce the volume.

A packaging container for containing and transporting a product is indispensable because the product is prevented from being contaminated and the surface thereof is designed so as to stimulate (stir up) a purchase will. Further, when the stored product is easily damaged by an external impact or the like, it is desirable that the packaging container is strong and has high durability and high mechanical strength.

On the other hand, when the packaging container becomes unnecessary, it is desired to reduce the volume and volume as much as possible so that the packaging container is not bulky and can be easily discarded. However, in the case of a packaging container which is strong, has excellent durability, and has high mechanical strength in order to protect the stored products, it cannot be easily crushed and the volume cannot be sufficiently reduced. In particular, in the case of a packaging container having a high strength at the bottom, even if the side is crushed, the bottom remains without being destroyed and is difficult to discard.

Therefore, as a means of destroying the bottom of the container, by making a fold line on the bottom of the paper cup, it is easy to fold the bottom along this fold line and crush the paper cup that is discarded when it is no longer needed. A technique for reducing the volume and volume has been proposed (for example, see Patent Document 1).

However, the broken line shown in Patent Document 1 is difficult to apply to a packaging container for storing, transporting, storing and displaying a product which is easily damaged by an external impact or the like. That is, if the bottom of the packaging container is bent to make it easier to bend, the mechanical strength against the stress applied from the side direction of the packaging container is reduced, the packaging container is easily crushed by an external impact, etc., and the stored product is damaged. There is a risk that

On the other hand, if the strength of the bottom member is increased so that the packaging container will not be easily crushed by an external impact, the bottom part will not be easily bent along the fold line and the fold line will be provided on the bottom part of the packaging container. It does not make sense.
Therefore, the fold line shown in Patent Document 1 means that it is a container formed of a member having low mechanical strength that is not intended to accommodate, convey, store and display a product such as a paper cup. Although it is sufficient, it can be said that it is not suitable for a quasi-rigid packaging container formed of a member having high mechanical strength which is durable and excellent in durability.

Further, referring to the technique disclosed in Patent Document 1, a straight perforation is provided at the center of the bottom surface of the packaging container, and stress is applied to the perforation to break the perforation, so that the bottom along the perforation. It is easily conceived that the packaging container is destroyed from the vicinity of the center so that the packaging container can be flatly crushed.

However, if the perforation is a straight line, pressing the perforation part with a finger to open the perforation will cause the finger to be inserted through the bottom part of the perforated perforation and break. It is not desirable because fingers may be caught between the edges of the perforations on the bottom of the dented bottom, possibly causing injury.

Therefore, the bottom plate of a cardboard box or a packaging box is provided with perforations that open the entire surface by combining perforations having a linear shape so that the fingers are not caught between the perforations in the broken bottom plate. Several techniques have been proposed that make it easier to flatten a container and reduce the volume and volume of the bottomed container to be discarded (for example, see Patent Documents 2 and 3).

However, in the case of the perforations shown in Patent Documents 2 and 3, since the perforations are formed through the central region of the bottom plate, the manufacturing process of the packaging container and the accommodation and transportation of the products are carried out. In the process of storage, exhibition, etc., stress may be applied to the perforations, and the perforations may unintentionally tear. Such unintended tearing of perforations occurs not only when the bottom plate (the edge of the package) is impacted from the side direction of the packaging container but also when the packaging container is efficiently and mechanically manufactured by using a device. Sometimes.

For example, when mechanically manufacturing a bottomed cylindrical packaging container using a bottomer (bottom sticking device), after inserting a pre-manufactured tubular body so as to cover the mandrel of the bottomer and supporting it, A bottom member, which is a bottom plate manufactured by punching in advance, is arranged in the bottom side opening of the tubular body, and the bottom side opening edge portion of the tubular body is folded to join the tubular body and the bottom member. At this time, the perforation is formed on the bottom member in advance so as to be located in the central region of the bottom surface, or is formed in the central region of the bottom plate after joining the tubular body and the bottom member. Becomes Then, the finished packaging container is pulled out from the mandrel, but the inside of the packaging container supported by the mandrel becomes close to a closed state as the bottom side opening of the tubular body is closed by the bottom member, When the packaging container is pulled out from the mandrel, a negative pressure is generated inside the packaging container. Therefore, to alleviate this, air is jetted from the inside of the mandrel toward the central region of the bottom plate of the packaging container. However, due to the negative pressure generated inside the packaging container and the influence of the pressure applied by the air ejected from the inside of the mandrel, part of the perforations formed on the bottom plate may be cleaved.

In other words, since the perforations are formed so that they can be easily torn when external stress is applied, if a part of the perforations is torn off due to some impact, this part will trigger the destruction of the bottom part. Will end up. Then, even if the product itself contained in the packaging container is not damaged, the product may not be sold as a product.

JP, 2002-193239, A JP, 10-297626, A Japanese Patent No. 5372424

The present invention has been made in view of the above circumstances, and it is possible to reduce the volume and volume of a quasi-rigid packaging container having high mechanical strength, which is durable and excellent in durability and is not easily crushed by an external impact or the like. It is an object of the present invention to provide a technique in which the perforation provided on the bottom surface of the packaging container is improved in order to improve the performance. Specifically, it goes without saying that the bottom surface of the packaging container can be easily destroyed by crushing it in a planar manner, and there is no risk of injury when the bottom surface is destroyed, and An object of the present invention is to provide a packaging container having a rupture structure in which the destruction of the bottom surface portion is not unintentionally started.

The packaging container having a rupture structure according to the present invention is a semi-rigid packaging container having a fragile portion that allows the bottom portion to be ruptured, and the fragile portion is a non-linear shape provided so as to avoid the central region of the bottom portion. It is characterized by exhibiting.

Further, the fragile portion may include a curved region formed from at least one arc, for example, two straight lines continuously extending from the one end side and the other end side of the curved region toward the peripheral edge of the bottom face portion. It may have a mountain shape including a region.
Further, as the fragile portion, specifically, a breaking perforation formed so that the joint portion is located at the top of the arc forming the curved region can be used.

When the fragile portion is a perforation for breaking that exhibits the above-mentioned mountain shape, the perforation for breaking is located at the top of the arc that constitutes at least the curved region in consideration of easiness of tearing. The length of the connecting portion to be connected may be set shorter than the length of the other connecting portion. In addition, the perforation for breaking has three joints including the joint located at the top of the arc forming the curved region and two joints adjacent to this joint in consideration of further easiness of cleavage. The length of the connecting portion may be set shorter than the lengths of other connecting portions. Further, in the perforation for breaking, depending on the size (length) of the curved area, the lengths of all the connecting portions forming the curved area are set shorter than the length of the connecting portion in the linear area. Good as a thing.

Further, when the breaking perforation having the chevron shape is used as the fragile portion as described above, it is preferable that the cut portion on the end side in the linear region does not reach the peripheral edge of the bottom surface portion. More preferably, the cut portion on the side is formed in an arc shape that bends away from the peripheral edge.

Further, in the present invention, when the bottom surface portion is provided with the perforation for breaking that exhibits a mountain shape as described above, the bottom surface portion is visually or tactually recognized in the vicinity of the joint portion located at the top of the arc forming the curved region. It is desirable to have a mark that can be done.

Further, the packaging container according to the present invention may have a bottom surface having a circular shape, an elliptical shape, or a polygonal shape.
In the packaging container having the bottom portion shaped as described above, the breaking perforations of the present invention may be provided in at least two places, in which case the fragile portion is provided in a symmetrical position. Desirable.

Furthermore, in the case of a packaging container having a polygonal bottom surface, the fragile portion is preferably provided such that the tops of the arcs forming the curved regions are located at the corners of the bottom portion.

The packaging container according to the present invention includes a fragile portion having a non-linear shape provided so as to avoid the central region of the bottom surface portion. Therefore, by pressing the vicinity of the fragile portion having a non-linear shape to apply stress, the fragile portion can be cleaved and the bottom portion can be easily destroyed. Moreover, since the fragile portion has a non-linear shape, when the fragile portion is cleaved, the bottom portion spreads flat and is destroyed, and a finger penetrating the bottom portion is fragile at the fractured bottom portion. There is also no danger of being injured by being pinched between the edges.

Further, the packaging container of the present invention is provided with the fragile portion which does not pass through the central region of the bottom surface portion. Therefore, when mechanically manufacturing a packaging container, even if air is sprayed toward the central area of the bottom surface of the packaging container, the fragile portion will not be directly impacted by air, and the fragile portion will partially tear. It doesn't get lost.

As described above, according to the present invention, in order to reduce the volume and volume of a quasi-rigid packaging container having high mechanical strength, which is durable and excellent in durability and is not easily crushed by an external impact, etc. Of course, the bottom of the container can be destroyed so that it can be crushed flatly easily, and there is no risk of injury when the bottom is destroyed, and the bottom is unintentionally damaged. It is possible to provide a packaging container having a rupture structure in which the rupture of (1) does not start.

It is a figure which shows the state in which the perforation for breaking was provided in the bottom face part of the packaging container which concerns on this invention as an example of a weak part. It is a figure explaining the cutting|disconnection part and the connection part in the perforation|rupture perforation shown by [FIG. 1]. It is a figure explaining the length of the joint part in the perforation|rupture perforation provided in the bottom face part of the packaging container which concerns on this invention. It is a figure explaining the length of the joint part in the other perforation|rupture perforation provided in the bottom face part of the packaging container which concerns on this invention. It is a figure which shows the other perforation for breaking provided in the bottom face part of the packaging container which concerns on this invention. It is a figure which shows the other perforation for breaking provided in the bottom face part of the packaging container which concerns on this invention. It is a schematic diagram explaining an example of the method of manufacturing the cylindrical body used for manufacturing the packaging container according to the present invention. It is a plane schematic diagram explaining the apparatus which manufactures the packaging container concerning the present invention. It is a figure which shows the cylindrical body used for manufacture of the packaging container which concerns on this invention, and the bottom member used as a bottom face part. FIG. 10 is a side transparent view (A) showing a state in which the tubular member shown in FIG. 9 and the bottom member are joined, and FIG. (A) A perspective view showing a state in which a breaking perforation provided on a bottom surface portion is broken, illustrating a work for flatly crushing a packaging container according to the present invention, (B) A broken breaking perforation FIG. 3A is a perspective view showing a state in which the bottom view is substantially entirely destroyed, and (C) is a perspective view showing a state in which the packaging container in which the bottom portion is destroyed is flatly crushed. It is a bottom view which shows the packaging container used for the test conducted in order to confirm the effect of the perforation for breaking provided in the bottom face part of the packaging container which concerns on this invention. It is a figure which shows the other perforation|rupture perforations which can be provided in the bottom face part of the packaging container which concerns on this invention. It is a figure which shows the other perforation|rupture perforations which can be provided in the bottom face part of the packaging container which concerns on this invention.

Hereinafter, an embodiment of a packaging container having a fractured structure (hereinafter, simply referred to as “packaging container”) according to the present invention will be described with reference to the drawings.
The embodiments described below are technically limited because they are preferable specific examples of the present invention, but the scope of the present invention is not limited to the following description. Unless it is not limited to these forms.

The packaging container of the present invention can store, convey, store, and display snack confectionery such as molded potato chips and corn chips, and protect the stored snack confection from being damaged by an external impact. It is a semi-rigid packaging container having mechanical strength to the extent possible.

The packaging container according to the present invention may be a paper material, a synthetic resin material, or a combination of both as long as it can be manufactured as a semi-rigid one, and the material is not particularly limited. .. Therefore, for example, in addition to general papers made from wood pulp, papers made from kenaf bamboo other than waste paper pulp or wood pulp, or synthetic papers coated with a thermoplastic resin on the surface of these papers, synthetic papers. A resin sheet or the like can be freely selected and manufactured.

Further, the packaging container according to the present invention can be manufactured by joining a tubular body that is a peripheral body (side surface) portion and a bottom member that is a bottom portion, and the tubular body and the bottom member can be made of an appropriate material. It may be manufactured by changing.
Further, in the packaging container according to the present invention, the peripheral body portion (cylindrical body) may be manufactured by using one thick sheet material, or a plurality of types of base papers having different basis weights may be stacked ( It may be manufactured in multiple layers.

In the present embodiment, a case will be described as an example in which a fragile portion that can be cleaved is provided on the bottom surface portion of a packaging container having a cylindrical peripheral body portion.
As shown in FIG. 1, the packaging container 10 according to the present embodiment includes a fragile portion 15 having a non-linear shape on a circular bottom portion 12, and the fragile portion 15 avoids the central region of the bottom portion 12. It is characterized by being provided.

The fragile portion 15 has a fracture structure that allows the bottom portion 12 to be easily cleaved. The fragile portion 15 is, for example, a breaking sewing machine in which a cutting portion 16 as a notch that penetrates the member forming the bottom surface portion 12 in the thickness direction and a joint portion 17 not provided with the notch are alternately formed. Good for the eyes. Further, the fragile portion 15 may be a striped thin portion formed so as not to penetrate the member forming the bottom surface portion 12.

By providing the fragile portion 15 having a non-linear shape so as to avoid the central region of the bottom surface portion 12 in this manner, the destruction of the bottom surface portion 12 starting from the fragile portion 15 starts from the vicinity of the peripheral edge of the bottom surface portion 12 toward the center. It will be spread efficiently in a plane.

In FIG. 1, the fractured portion 15 in the present embodiment is a curved region α formed from one arc, and one end side and the other end side of this curved region α in the direction of the edge 12a of the bottom surface portion 12, respectively. It has a mountain-shaped shape in which two linear regions β, β extending obliquely are continuous, and is shown as a perforation for breaking in which cutting portions 16 and connecting portions 17 are alternately formed.

As shown in FIG. 2, the breaking perforation 15 is preferably a breaking perforation formed so that the connecting portion 17α is located at the top of the arc forming the curved region α. That is, it is important that the breaking perforation 15 formed on the bottom surface portion 12 is easily torn, but it will not be unintentionally torn by an external impact or stress when handling the packaging container 10. That is also important.

However, as shown in FIG. 5, when a cutting portion 16α is present at the top of an arc forming the curved region α in the perforation for breaking having a mountain shape, the perforation 15 for breaking is cleaved starting from the cutting portion 16α. Is easy to start. Then, there is a possibility that the perforation for breaking may be unintentionally opened from the cutting portion 16α as a starting point due to an external impact or stress when the packaging container 10 is handled.

Therefore, in the present embodiment, the starting point position at which the breaking perforation 15 formed on the bottom surface portion 12 is cleaved is examined so that the connecting portion 17α is located at the outwardly facing apex of the arc forming the curved region α. A perforation 15 for breaking is provided on the.

When the connecting portion 17α is located at the top of the arc forming the curved region α in the breaking perforation 15 as described above, the strength of the starting point where the breaking perforation 15 starts to be broken increases, and the unintended breaking perforation It is possible to control such that the cleavage of the eye 15 does not occur.

In FIG. 2, the breaking perforation 15 has a cutting portion 16α that forms the curved area α, a joint portion 17α, a cutting portion that forms the linear area β that is symbol 16β, and a joint portion that is numeral 17β, Also, a connecting portion located between the curved area α and the linear area β is shown as reference numeral 17. Therefore, in FIG. 2, the perforation 15 for breaking has the joint portions 17α located at the tops of the arcs forming the curved region α, the cut portions 16α are formed on both sides of the joint portion 17α, and the cut portions 16α are continuous with each other. It is shown as being formed so that the cut portions 16β and the connecting portions 17β in the linear region β are alternately located via the connecting portions 17.

The breaking perforation 15 shown in FIG. 2 is merely an example, and the numbers of the connecting portions 16α, 16β and the cutting portions 17α, 17β existing in the curved region α and the linear region β in the breaking perforation 15 are shown. It is not limited to what you eat. Therefore, for example, if the arc forming the curved region α in the perforation 15 for breaking is enlarged, the number of the cut portions 16α and the connecting portions 17α existing in the curved region α becomes larger than the number shown in FIG. .. Further, if the length of the cut portion or the joint portion in the perforation 15 for breaking is reduced, the number of the joint portions 16α, 16β and the cut portions 17α, 17β existing in the curved region α or the linear region β is as shown in FIG. More than the number shown.

Further, in the present embodiment, as shown in FIG. 3, the breaking perforation 15 has at least the length of the joint portion 17α located at the top of the arc forming the curved region α in consideration of easiness of tearing. However, it is advisable to set the length shorter than the length of the other joints. That is, it can be said that the apex of the arc forming the curved region α in the breaking perforation 15 having a mountain shape can be a starting point where the tearing of the breaking perforation 15 starts. Therefore, by shortening the length of the connecting portion 17α existing at the starting position, the strength of this portion can be weakened.

Therefore, when the portion where the tearing of the breaking perforation 15 starts to be the top of the arc forming the curved region α, the connecting portion 17α is provided at this top, and the length of this connecting portion 17α is changed to another connecting portion. By making the length shorter than the length of the portion, the strength of the joint portion 17α is weakened and the perforation portion for breaking is weakened by a small stress (pressing force) while controlling so as to prevent unintended tearing of the perforation portion 15 for breaking as described above. Cleavage of 15 may be possible.

In the breaking perforation 15 in FIG. 3, the length L1 of the connecting portion 17α located at the top of the arc forming the curved region α is set shorter than the length L2 of the connecting portion 17β forming the linear region β. It is shown as an item (L1<L2).

Further, the length of the connecting portion 17 located between the curved region α and the linear region β can be appropriately changed in design depending on the desired easiness of tearing the perforation 15 for breaking. For example, when the cut portion 16α forming the curved region α is long and easily cleaved, the length of the connecting portion 17 forms the curved region α similarly to the connecting portion 17β in the linear region β. It can be longer than the connecting portion 17α. On the other hand, when the cutting portion 16α forming the curved area α is short and difficult to be cleaved, the length of the connecting portion 17 is the same as that of the connecting portion 17α forming the curved area α in the linear area β. It can be shorter than the connecting portion 17β.

Therefore, in the present invention, the perforation 15 for breaking is, as shown in FIG. 4, a joint portion 17α located at the top of an arc forming the curved region α, and two joint portions 17 adjacent to the joint portion 17α. The length of the three connecting portions including 17 may be set shorter than the length of the other connecting portion 17β.
As a result, the easiness of tearing the perforation 15 for breaking can be increased, and control of unintended tearing of the perforation 15 for breaking and adjustment of the ease of tearing the perforation 15 for breaking are achieved. Can be

In FIG. 4, the breaking perforation 15 has a connecting portion 17α located at the top of an arc forming the curved area α and a length L1 of two connecting portions 17 and 17 adjacent to the connecting portion 17α, which is a linear area β. It is shown as the one (L1<L2) set shorter than the length L2 of the connecting portion 17β constituting it.

Further, in the present invention, the breaking perforation 15 is not shown, but depending on the size of the arc forming the curved region α, regardless of the joint portion 17 located between the curved region α and the linear region β. The lengths of all the joints forming the curved area α may be set shorter than the lengths of the joints in the linear area β.
This also makes it possible to increase the easiness of tearing the perforation 15 for breaking, and to control the unintentional tearing of the perforation 15 for breaking and adjust the ease of tearing the perforation 15 for breaking. You can

In addition, as shown in FIGS. 1 and 2, the bottom surface portion 12 of the packaging container 10 according to the present invention has a visual feature such as a character or a graphic near the joint portion 17α located at the top of the arc forming the curved region α. It is desirable that a mark 18 that can be visually recognized or tactilely recognized such as unevenness is provided.

This mark 18 is provided so that the pressing position for easily tearing the breaking perforation 15 with a small force can be seen, and in FIGS. 1 and 2, the mark 18 is shown as a black star. ing. Therefore, by pressing this portion, the breaking perforations 15 can be efficiently cleaved.

Further, in the present invention, it is desirable that the perforation 15 for breaking has a cut portion on the end side in the linear region β that does not reach the peripheral edge of the bottom surface portion. That is, as shown in FIG. 6, when the cutting portion 16e on the end side in the linear region reaches the peripheral edge 12a of the bottom surface portion 12, when stress such as impact is applied to the peripheral edge 12a portion of the packaging container 10, The force may be transmitted to the perforation for breaking and may unintentionally tear.

Therefore, in the present invention, the stress applied to the peripheral edge 12a portion of the packaging container 10 is used for breaking by providing a so-called buffer area between the perforation 15 for breaking and the peripheral edge 12a of the packaging container 10 so that there is no cut portion. It is possible to prevent the unintentional tearing of the perforation 15 for breaking by controlling so as not to be transmitted to the perforations.

Further, in the present invention, the breaking perforation 15 is formed in an arc shape in which the cut portion on the end side in the linear region β does not reach the peripheral edge of the bottom surface portion and bends away from the peripheral edge of the bottom surface portion. It is preferable that That is, as shown in FIG. 5, when the cutting portion 16e on the end side in the linear region β is linearly formed toward the peripheral edge 12a side of the bottom surface portion 12, when the perforation 15 for breaking is cleaved. The bottom surface portion 12 is destroyed along the extension of the linear region β. Then, the bottom part 12 may be destroyed at the shortest time due to the cleavage by the perforation 15 for breaking, and may reach the peripheral edge 12a, and the bottom part 12 may not be sufficiently broken.

Therefore, in the present invention, the cut portion 16e on the end side in the linear region β is formed in an arc shape that bends away from the peripheral edge 12a of the bottom surface portion 12 so that the bottom surface when the perforation 15 for breaking is torn open. It may be assumed that the portion 12 is broken along the extension line of the cut portion 16e on the end side where it bends in an arc shape so as not to reach the peripheral edge 12a immediately, and the bottom portion 12 is efficiently broken in a plane. it can.

Next, a method for manufacturing the packaging container of the present invention described above will be described.
The packaging container 10 of the present invention can be crushed by hand when it is discarded, and can be mechanically manufactured by the method described below, for example.

First, in the packaging container 10, a tubular body to be the peripheral body portion 11 is manufactured in advance.
Specifically, for example, the tubular body can be manufactured using a winder device schematically shown in FIG. 7. In the winder device, a plurality of strip-shaped sheet members are spirally overlapped and wound around a fixed mandrel (metal roll) WM to form a long tubular body 1A having both one end and the other end open. To manufacture. Then, the long tubular body 1A is pulled out from the mandrel WM and cut into a predetermined length to form an individual tubular body 1 as shown in FIG.

FIG. 7 schematically shows a state in which four strip-shaped sheet members 1a, 1b, 1c, 1d are spirally overlapped and wound around the mandrel WM to manufacture the long tubular body 1A.

On the other hand, in advance separately manufactured bottom member 2 that Do a bottom portion 12 have contact to the packaging container 10.
As shown in FIG. 9, this bottom member 2 has the same shape as the bottom side opening 1b of the tubular body 1, and is formed slightly larger by the folding width 2w that can be joined to the bottom side opening 1b. ing.

The bottom member 2 is formed by punching out a sheet member. For example, the bottom member 2 is formed immediately before joining the tubular body 1 and the bottom member 2 using a bottomer device as shown in FIG. It can be punched and molded. In this bottomer device, the mandrel BM rotates in the direction shown by the arrow in the figure, and the cylindrical body 1 and the bottom member 2 are continuously joined by passing through each process while rotating. It is something that can be done. Therefore, it is possible to perform punching of the bottom member 2 and joining of the tubular body 1 and the bottom member 2 in series using the bottomer device.

Each step of the bottomer device shown in FIG. 8 will be specifically described. First, in the first station of the bottomer device, the tubular body 1 is inserted into and supported by the mandrel BM.
Next, at the moved second station, the separately supplied sheet member is punched to form the bottom member 2, and at the same time, the punched bottom member 2 is pushed to the tip of the mandrel BM (that is, the bottom side opening 1b of the tubular body 1). Edge).

Here, a breaking perforation is formed in advance on the sheet member, and when punching the sheet member, it has the same shape as the bottom side opening 1b of the tubular body 1 and is folded from the bottom side opening 1b. The width is a little larger than the width of 2 w, and the perforations 15 for breaking are arranged so as not to be located in the central region of the bottom portion 12.
The punched bottom member 2 can maintain the state of being arranged at the edge portion of the bottom side opening 1b of the tubular body 1 by sucking from the inside of the mandrel BM.

Subsequently, at the skipped fourth station, the surface of the bottom member 2 is heated to melt the adhesive material applied in advance. That is, the surface of the sheet member for punching the bottom member 2 is previously coated with a meltable adhesive synthetic resin such as polyethylene (PE).

Further, in the next fifth station, a crease for folding the bottom side opening 1b of the tubular body 1 is formed, and the bottom side opening 1b edge of the tubular body 1 and the folding width 2w portion of the bottom member 2 are formed. Fold together.
Subsequently, in the sixth station, the folded tubular body 1 and the bottom member 2 are pressure-bonded to each other. Thereby, the packaging container 10 according to the present invention is manufactured.
The state of the joined tubular body 1 and bottom member 2 can be shown in FIG. 10, for example.

In FIG. 10, the edge portion of the bottom side opening 1b of the tubular body 1 is shown as being folded inward from the outside and joined so as to wrap around the folded width 2w portion of the bottom member 2.

Then, at the last skipped eighth station, as shown by the white arrow in the figure, while blowing air from the inside of the mandrel BM toward the central region of the bottom portion 12, the manufactured packaging container 10 is Pull out from the mandrel BM.

Incidentally, in the above-mentioned bottomer device, the perforation for breaking is described as punching using a preformed sheet member, but the perforation for breaking is formed at any station, and the bottom is formed by punching the sheet member. A series of steps from the molding of the member 2 to the joining of the tubular body 1 and the bottom member 2 may be performed.

Next, the case of discarding the manufactured packaging container 10 of the present invention will be described.
First, the unnecessary packaging container 10 is turned upside down, and a finger is attached to a mark 18 portion provided near the breaking perforation 15 formed on the bottom surface portion 12 from above (outside) to below (inward). Apply a load so that it is pushed in. Then, as shown in FIG. 11(A), the bottom surface portion 12 is easily broken along the breaking perforations 15 and slightly opens.

Subsequently, pushing in the vicinity of the perforation 15 for breaking is continued to open all the perforations 15 for breaking, and the bottom 12 is further pushed. Then, as shown in FIG. 11B, the bottom surface portion 12 is substantially entirely broken.
Thereafter, by pressing the peripheral body portion 11 of the packaging container 10 in the direction of the white arrow in the figure, the packaging container is easily flattened and crushed to reduce the volume and volume as shown in FIG. 11(C). Can be planned.

As described above, according to the present invention, by providing the fragile portion (perforation for breaking) having a non-linear shape while avoiding the central region of the bottom surface portion of the packaging container, the product stored even by an impact from the outside or the like It is possible to efficiently and easily perform the volume reduction work of a semi-rigid packaging container formed of a member having high mechanical strength that is durable and excellent in durability and is not easily damaged.

In addition, in the above-described present embodiment, the description has been given of the one in which the breaking perforation having the mountain shape is provided as the fragile portion while avoiding the central region in the bottom surface portion of the cylindrical packaging container having the circular bottom surface portion. However, the present invention is not limited to this.
Therefore, in the present invention, as the fragile portion having a non-linear shape, for example, as shown in FIG. 12B, a curved region formed from one arc and one end side and the other end side of the curved region. The breaking perforation having an umbrella shape including two linear regions extending diagonally in the peripheral direction may be provided so as to avoid the central region of the bottom surface portion. Further, as shown in FIG. 12C, the breaking perforation having an arc shape formed of a curved region formed by one arc may be provided so as to avoid the central region of the bottom surface portion.

Further, in the present invention, the fragile portion having a non-linear shape may be formed by two arcs having continuous curved regions. Such a fragile portion can be shown in FIG. 13, for example.
In FIG. 13, as a fragile portion, a curved region α formed by two continuous arcs, and two straight lines extending from one end side and the other end side of the curved region α toward the edge 12a of the bottom surface portion 12 respectively. The packaging container 20 provided with the perforation 25 for breaking, which has a double-humped (mountain-shaped) mountain shape in which the shape regions β and β are continuous, is shown.

When the fragile portion has a double-humped shape in this way, there are two apex portions of the arc forming the curved region that is the portion where the fragile portion starts to cleave, and the bottom surface portion should be destroyed efficiently. You can That is, when the fragile portion having such a double-humped shape is to be cleaved, for example, the bottom portion of the packaging container faces the front, and the peripheral body portion is held by both palms. Then, one thumb is attached to the mark 18 provided in the vicinity of one arc in the fragile portion, and the other thumb is pressed to the mark 18 provided in the vicinity of the other arc in the fragile portion. As a result, the fragile portion can be easily split and the bottom portion can be efficiently destroyed.

Further, the present invention, the fragile portion having a non-linear shape, those provided in at least two places avoiding the central region of the bottom portion, and fragile portions provided in two places avoiding the central region of the bottom portion. It may be provided at symmetrical positions.

By providing at least two or more fragile portions in the present invention, the bottom surface portion can be efficiently destroyed even in a packaging container having a large bottom surface portion. Moreover, if the fragile portions are provided at symmetrical positions, it is possible to easily perform the volume reduction work of flatly crushing the packaging container.

In addition, the bottom of the packaging container with a polygonal bottom surface is provided with a fragile portion having a mountain shape, or the top of the arc forming the curved region of the fragile portion is at the corner of the bottom portion. It may be located. It can be shown, for example, in FIG. 14 that the bottom face has a polygonal shape, and the tops of the arcs forming the curved regions in the fragile portion are located at the corners of the bottom face.

In FIG. 14, the bottom surface portion 32 has a quadrangular shape with rounded corners, and there is shown a packaging container 30 provided with two breaking perforations 35A and 35B having a mountain shape as a weak portion. In this packaging container 30, the first breaking perforation 35A is located at the upper left corner of the arc forming the curved area, and the second breaking perforation 35B constitutes the curved area. Since the top of the arc is located in the lower right corner, the breaking perforations 35A and 35B provided at two places are shown as being provided at symmetrical positions.

Even in a packaging container having a polygonal bottom surface as described above, the fragile portion can be easily cleaved to efficiently destroy the bottom surface. Moreover, by providing the fragile parts at two symmetrical positions, even if the packaging container has a large bottom portion, the bottom portion can be efficiently destroyed, and the volume reduction work of flatly crushing the packaging container can be performed easily. You can

Next, in order to describe the structure of the packaging container according to the present invention in more detail, specific examples will be described.
First, in order to confirm that it is desirable to provide a fragile portion having a non-linear shape while avoiding the central region of the bottom portion, a perforation for breaking having various shapes is formed on the bottom portion of the packaging container as the fragile portion, The force required to open the perforation for breaking was measured.

The packaging container used for the measurement had a cylindrical shape with a diameter of about 70 mm and a length of 150 mm, and the tubular body 1 part was manufactured by spirally winding four types of strip-shaped sheets having different basis weights. .. The bottom portion 12 was formed by using a bottom material having a basis weight of 210 g/m ² in which polyethylene was applied in advance on the surface of the base paper.

Further, the shape of the perforation for breaking measured was as shown in FIG.
Example 1 is one in which the breaking perforations having various chevron shapes described in the embodiments of the invention are provided so as to avoid the central region of the bottom surface portion (see FIG. 12A). In addition, in Example 2, breaking perforations having an umbrella shape were provided so as to avoid the central region of the bottom surface portion (see FIG. 12B). In the third embodiment, the perforation for breaking having an arc shape is provided so as to avoid the central region of the bottom surface portion (see FIG. 12C).

In addition, as Comparative Example 1, a rupture having a straw hat shape including a curved region formed from one arc and two linear regions extending in a lateral direction from one end side and the other end side of the curved region, respectively. The same measurement was performed for a machine having perforations in the central region of the bottom surface (see FIG. 12D). Further, as Comparative Example 2, a blank test was conducted on a bottom surface without a perforation for breaking (see FIG. 12E).
In each of the perforations for breaking shown in (A) to (D), the length of the cut portion is 6.5 mm and the length of the joint portion is 2.0 mm.

In addition, as for the measuring method, since no suitable measuring device was found, the manufactured packaging container was placed upside down on a digital platform scale (DP6700 manufactured by Daiwa Seigaku Co., Ltd.), and from FIG. ), a simple means for gradually pressing the portion indicated by the black circle to measure the value of the load applied to the digital platform scale until the perforation for breaking is split as the strength of perforation for breaking. I went by. Then, the average value obtained by performing this measurement 10 times is shown as a result together with the evaluation, and the following [Table 1] is shown.

In addition, since the evaluation showed that the value in the blank test (Comparative Example 2) was 12.0 Kg, in order to easily cleave the bottom part, it was cleaved with a force of at least less than half (6.0 kg). If it is not possible, it is not desirable, and on the other hand, if it is to be cleaved with a force less than one-third (2.0 kg), it is judged that there is a risk of unintentional cleaving due to impact from the outside. It is based.

Therefore, if it is cleaved with less than 2.0 kg, it is evaluated as “x” because it may be unintentionally cleaved, and if it is cleaved with 2.0 kg or more and less than 6.0 kg, it may be unintentionally cleaved. The evaluation is "○" as the one which does not exist and is easy to be cleaved, and the one which cannot be cleaved unless it is 6.0 kg or more is shown as "x" because it is difficult to cleave.

From the results of [Table 1], in each of Examples 1 to 3 in which the perforation for breaking having a non-linear shape was provided while avoiding the central region of the bottom surface, the strength as the fragile portion was appropriate, and It was confirmed that there is no risk of unintentional cleavage due to impact, etc. Among them, it was found that the break perforation having the umbrella shape of Example 2 was the most desirable.
On the other hand, it was found that Comparative Example 1 in which the breaking perforation having a non-linear shape was provided in the central region of the bottom surface portion had low strength as a fragile portion as expected, and there was a risk of unintentional cleavage, which is not desirable.

Subsequently, the values obtained when the packaging container in which the perforation for breaking of Examples 1 to 3 in which the desired result was obtained as the fragile portion was opened were pressed from the directions A and B shown in FIG. 12 to crush the packaging container. Was measured. Then, the average value obtained by performing this measurement 10 times is shown as a result together with the evaluation, and the following [Table 2] is shown.
Also, for reference, the same measurement was performed on the packaging container of Comparative Example 2 having no perforation for breaking. However, in Comparative Example 2, since the crushing direction is irrelevant, only the measurement in which the bottom surface portion is left as it is and the pressure is applied from the direction a shown in FIG.

From the results in [Table 2], it was confirmed that the packaging container can be easily crushed by breaking the breaking perforation, regardless of the shape of the breaking perforation.

Next, among Examples 1 to 3 which obtained favorable results in the above evaluation, the tearing perforation having the chevron shape of Example 1 in which the strength of the weak portion was intermediate was used to further cleave. We examined various ways to make it easier. Here, the reason for further study using the breaking perforation having the chevron shape is that if a good result can be obtained with the breaking perforation having the chevron shape in which the strength of the fragile part was intermediate, This is because it is presumed that similar results can be obtained with the perforation for breaking having the shape of, and it can be diverted easily.

First, in the perforation for breaking, what length of the joint portion is desirable was examined. That is, the length of the joint portion was 2.0 mm in the above-mentioned Example 1, but it was confirmed how much it can be shortened to make the cleavage easier.
Therefore, with the length of the joint portion in Example 1 as a reference, the length was gradually shortened and the same measurement was performed. Specifically, Example 4 is a breaking perforation having a mountain shape in which the length of the connecting portion is 1.8 mm, and Example 5 is a mountain in which the length of the connecting portion is 1.5 mm. It is a perforation for breaking which has a die shape. In addition, when the length of the connecting portion was set to 1.5 mm or less, it was judged that there was a risk of unintentional cleavage, and therefore it was not performed. The measurement results are shown in [Table 3] below together with the evaluation.

From the results of [Table 3], it was found that when the length of the joint portion was 1.8 mm, the perforation for breaking was considerably easy to be cleaved, as compared with the case where the length was 2.0 mm. Further, when the length of the joint portion is 1.8 mm, the measured value is 2.9 kg, which is significantly lower than the measured value of 4.1 kg when the joint portion length is 2.0 mm. It is presumed that if the length is 1.5 mm, the risk of unintentional cleavage will be significantly increased. As a result of actually measuring the case where the length of the joint portion is 1.5 mm, the perforation for breaking can be cleaved with a force as small as 0.8 kg, and the risk of unintentional cleavage is significantly increased. In addition, it has been found that it is desirable that the length of the joint portion is about 1.8 mm in the perforation for breaking.

Next, using a breaking perforation (Example 4) in which the length of the connecting portion for which favorable results were obtained was 1.8 mm, the connecting portion was formed so as to be located at the top of the arc forming the curved region. It was confirmed by performing the same measurement that it was preferable to do. The measurement results are shown in the following [Table 4] together with the evaluation.

From the results in [Table 4], it can be confirmed that it is preferable to form the connecting portion so as to be located at the top of the arc forming the curved area, and if there is no connecting portion at the top of the arc forming the curved area. It has been found that the breaking strength of the perforation perforation is significantly reduced as compared with the case where there is a connecting portion, which may cause unintended cleavage. Further, from this result, it is presumed that similar results can be obtained even when the length of the connecting portion is 2.0 mm.

Next, from Example 4 above, it was found that setting the length of the connecting portion to 1.8 mm facilitates cleavage as compared with the case of 2.0 mm, but the length of the connecting portion is 2.0 mm. In this case, the case of making the cleavage easier was examined.
Therefore, in the perforation for breaking that exhibits a mountain shape, it is desirable to make the length of the connecting portion located at the top of the arc forming the curved region shorter than the length of other connecting portions. The same measurement was performed and confirmed. Specifically, Example 7 is a perforation machine for breaking, which has a mountain shape in which the length of the connecting portion located at the top of the arc is 1.5 mm and the length of the other connecting portion is 2.0 mm. Example 8 is a breaking perforation having a chevron shape in which the length of the connecting portion located at the top of the arc is 1.0 mm and the length of the other connecting portion is 2.0 mm. The measurement results are shown in the following [Table 5] together with the evaluation.
In addition, when the length of the connecting portion located at the top of the arc was set to 1.0 mm or less, it was judged that there was a risk of unintentional cleavage, and therefore it was not performed.

From the results of [Table 5], when the length of the connecting portion in the perforation for breaking is 2.0 mm, the length of the connecting portion located at the top of the arc is preferably 1.5 mm or 1.0 mm, and all are It was found that the perforation for breaking can be easily opened as compared with the case where the length of the joint portion is 2.0 mm. In particular, it was found that when the length of the connecting portion located at the top of the arc was set to 1.0 mm, it was possible to make the cleavage considerably easy. In addition, since the measured value is 2.5 kg when the length of the top joint is 1.0 mm, setting the length of the top joint to 1.0 mm or less increases the risk of unintentional cleavage. It is speculated that

Finally, from Example 8 above, when the length of the joint in the perforation for breaking is 2.0 mm, the length of the joint located at the top of the arc is set to 1.0 mm, and Was found to be considerably easy to cleave, but a case was investigated in which the cleaving at the top of the arc was 1.5 mm to make it easier to cleave.
Therefore, in the perforation for breaking that presents a mountain shape, the length of the three connecting portions including the connecting portion located at the top of the arc forming the curved region and the two connecting portions adjacent to this connecting portion are set. It was confirmed by performing the same measurement that it is preferable to shorten the length of the other connecting portion. Specifically, in Example 9, the length of the three connecting portions including the connecting portion located at the top of the arc forming the curved region and the two connecting portions adjacent to this connecting portion is 1.5 mm. And a piercing perforation having a mountain shape in which the length of the other connecting portion is 2.0 mm. The measurement results are shown in the following [Table 6] together with the evaluation.

From the results of [Table 6], in the breaking perforation having the mountain shape, three joints including the joint located at the top of the arc forming the curved region and the two joints adjacent to this joint are provided. By setting the length of the connecting part to 1.5 mm and the length of the other connecting parts to 2.0 mm, the length of all the connecting parts is set to 1.8 mm, or the arc that forms the curved area Compared to the case where the length of only the joint located at the top of the is set to 1.5 mm or 1.0 mm and the length of the other joint is set to 2.0 mm, the perforation for breaking can be easily opened. It turned out to be desirable.

α curved region, β linear region, 1 tubular body, 1b bottom side opening, 2 bottom member, 2w folding width 10, 20, 30 packaging container, 11 round body part, 12 bottom surface part, 12a peripheral edge, 15, 25, 35A, 35B Perforation for breaking (fragile part), 16, 16e, 16α, 16β Cutting part, 17, 17α, 17β Splicing part, 18 mark.

Claims (10)

A fragile portion that is formed by joining a cylindrical body that serves as a peripheral body portion and a bottom member that serves as a bottom surface portion, and ruptures by pressing the bottom surface portion so that the bottom surface portion can be destroyed from the vicinity of the edge toward the center. A semi-rigid packaging container comprising:
The weak portion includes a curved region formed of at least one arc, and two mountain-shaped regions that continuously extend from one end side and the other end side of the curved region toward the peripheral direction of the bottom portion. It has a shape, and is a perforation for breaking formed so that the connecting portion is located at the top of the arc forming the curved region,
The perforation for breaking is provided so as to avoid the central region of the bottom face portion, and the cut portion on the end side in the linear region does not reach the peripheral edge of the bottom face portion, and is formed in an arc shape that bends away from the peripheral edge. Has been
A packaging container having a rupture structure characterized by the above. The breaking perforation according to claim 1 , wherein at least the length of the connecting portion located at the top of the arc forming the curved region is shorter than the length of the other connecting portion. Packaging container having. The perforation for breaking is a joint portion located at the top of an arc forming the curved region, and the length of three joint portions including two joint portions adjacent to this joint portion is the other joint portion. The packaging container having a rupture structure according to claim 1 , wherein the packaging container has a length shorter than the length of. The package having a rupture structure according to claim 1 , wherein the breaking perforations have lengths of all the connecting portions that constitute the curved area are shorter than a length of the connecting portions in the linear area. container. The bottom surface portion is provided with a visually or tactilely recognizable mark in the vicinity of the joint portion located at the top portion, and any one of claims 1 to 4 is provided. A packaging container having the fracture structure described. The bottom part, the packaging container having a breaking structure according to claims 1, wherein the circular or elliptical shape in any one of claims 5. The bottom part, the packaging container having a breaking structure according to claims 1 to any one of claims 5, characterized in that a polygonal shape. The said weak part is provided in at least two places, The packaging container which has the fracture|rupture structure of any one of Claim 1 to 7 characterized by the above-mentioned. The packaging container having a breakage structure according to claim 8 , wherein the fragile portions are provided at symmetrical positions. The fragile portion is as set forth in claim 7, characterized in that the top portion of the arc constituting the curved area in the corner portion of the bottom portion is provided so as to be positioned in any one of claims 9 A packaging container having a rupture structure.

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