WO2018168877A1

WO2018168877A1 - Small capacity container for viscous substance

Info

Publication number: WO2018168877A1
Application number: PCT/JP2018/009813
Authority: WO
Inventors: 啓佑丹生; 洋介阿久津; 柏原　貴; 宮崎　知之; 高橋　潤
Original assignee: 東洋製罐株式会社
Priority date: 2017-03-17
Filing date: 2018-03-13
Publication date: 2018-09-20
Also published as: CA3054538A1; US20200071023A1; KR20190121344A; EP3597563A1; JP2018154364A; CN110431089A; RU2725867C1; AU2018234035A1

Abstract

Provided is a small capacity container for a viscous substance that is capable of quickly ejecting a viscous content at any time even when held in an inverted state thereof or a state thereof close to the inverted state. A small capacity container having an inner capacity of 300 ml or less in which a viscous substance is to be accommodated is characterized in that an inner surface of a barrel part of the container has, when the container is held in an inverted state thereof, a region from which a substance is to be quickly ejected and a region from which the substance is to be slowly ejected.

Description

Small capacity container for viscous materials

The present invention relates to a small-capacity container for viscous substances having an internal volume of 300 ml or less, and particularly to a small-capacity container for viscous substances in which a highly viscous fluid is accommodated.

∙ Containers that contain liquid contents are required to discharge the contents regardless of the material of the container. In the case of containing a low viscosity liquid such as water, such discharge is hardly a problem. For example, in a viscous material such as mayonnaise or ketchup, it may be a plastic container. Whether it is a glass container, there is a demand for the contents to be quickly discharged and used up to the end without remaining in the container.

By the way, regarding the above-described dischargeability, various means for forming an oil film on the surface of a molded body such as a container have been proposed (for example, Patent Documents 1 and 2). By forming such an oil film, the slipperiness with respect to a viscous substance is improved, and the discharge property is improved.

However, when particularly viscous contents are contained in a small-capacity container, it may be difficult to discharge the contents. That is, when the container is held in an inverted state for discharging the contents, the contents remain in the container before reaching the outlet.

WO2012 / 100099 WO2013 / 022467

Accordingly, an object of the present invention is to provide a small-capacity container for viscous substances that can always quickly discharge viscous contents even when held in an inverted or near-inverted state. is there.

According to the present invention, in a small-capacity container having an internal volume of 300 ml or less in which a viscous substance is accommodated,
On the inner surface of the body portion of the container, when the container is held in an inverted state, a region where the contents are discharged quickly and a region where the contents are discharged slowly are formed. A small capacity container for storage is provided.

In the small-capacity container for viscous materials of the present invention, a modified cross-section type, liquid film formation is achieved by means for forming a region in which the contents are discharged quickly and a region in which the contents are discharged slowly on the inner surface of the body. Can be classified into types and bleeding types.
For irregularly shaped containers,
(1) The inner surface of the body of the container has a non-axisymmetric deformed side cross-section, and the formation of the deformed side cross-section causes the contents to be quickly discharged and the contents to be slow. The region to be discharged is formed,
The method is adopted.
In liquid film type containers,
(2) A liquid film of a lubricating liquid for improving slipping property against the viscous substance is formed on the inner surface of the body of the container, and the thickness of the liquid film is It is non-uniform in the circumferential direction, and due to the non-uniformity of the liquid film thickness, the region where the content is discharged quickly and the region where the content is discharged slowly are formed,
The method is adopted.
For bleeding type containers,
(3) The container has a multilayer structure, the inner surface of the container is formed of a lubricant-containing resin layer, and the thickness of the lubricant-containing resin layer is The region where the content is discharged quickly and the region where the content is discharged slowly are formed by the unevenness of the thickness of the lubricant-containing resin layer,
Or
(4) The container has a multi-layer structure, the inner surface of the container is formed of a lubricant-containing resin layer, the amount of the lubricant-containing resin layer is seen in the cross section of the trunk of the container, It is non-uniform in the circumferential direction, and due to the non-uniformity of the blending amount of the lubricant-containing resin layer, the region where the content is discharged quickly and the region where the content is discharged slowly are formed. ,
The method is adopted.

In the present invention,
(5) The viscous substance has a viscosity (25 ° C.) of 8 Pa · s or more,
(6) having a capacity greater than 70 ml;
(7) The content is food, medicine, toothpaste,
(8) It is a hollow molded container,
Is preferred.

The viscous container for viscous materials according to the present invention has an area where the contents are discharged quickly (area where the sliding speed is fast) and an area where the contents are discharged slowly (sliding speed) when the container is held in an inverted state. Of the slow region). That is, the slipperiness of the inner surface of the body of the container is non-uniform when viewed in the circumferential direction. In such a container for viscous materials with different slipperiness in the inner circumferential direction of the trunk part, when the contents are ejected by inverting it, it takes time to eject parts quickly from the trunk part. There is a part. For this reason, the air trapped by the contents at the bottom of the container is easily discharged by such a speed difference, and as a result, the contents are viscous paste-like, for example, viscosity (25 ° C.) Even if it is a viscous paste-like material of 8 Pa · s or more, it can always be easily discharged without staying in the container.

It is a figure which shows the schematic structure of an example of the irregular cross-section type in the small capacity container for viscous substances of this invention with the content, (a) is a schematic sectional side view, (b) is X plane sectional drawing. It is a figure which shows schematic structure of a conventionally well-known small capacity | capacitance container, (a) is a schematic sectional side view, (b) is X plane sectional drawing. The trunk | drum schematic plane sectional view which shows an example of the liquid film type in the small capacity container for viscosity of this invention. It is a trunk | drum general | schematic plane sectional view which shows an example of the bleeding type in the small capacity container for viscosity of this invention, (a) is the example which formed the area | region where the discharge | emission property of a content differs by thickness adjustment of a lubricant containing resin layer And (b) is an example in which regions with different contents discharging properties are formed by adjusting the blending amount of the lubricant-containing resin layer.

As described above, the small-capacity container for viscous material according to the present invention has a deformed shape by means for forming on the inner surface of the body part a region where the contents are discharged quickly and a region where the contents are discharged slowly. It can be classified into a cross-sectional type, a liquid film formation type, and a bleeding type.

In FIG. 1 showing a modified cross-section type form, the small-capacity container for viscous material of the present invention is shown in an inverted state, and includes a hollow cylindrical body 1, and one end of the body 1. The part is formed with a neck 3 serving as a discharge port for contents, and the other end is closed by a bottom 5.
Moreover, although it changes with forms of a container, the screw | thread 7 for sealing with a cap is formed in the outer surface of the neck part 3. FIG.

In such a small-capacity container for viscous substances of the present invention, the internal volume is 300 ml or less, particularly 150 ml or less. That is, since such a small capacity is lightweight, as shown in FIG. 1, the container may be held in an inverted or near-inverted state and the contents may be discharged. Occasionally it becomes difficult to discharge the contents, but in large-capacity containers, it is heavy and often has a handle, so the container is not inverted or held close to it, This is because the discharge of contents does not become a problem. Therefore, the capacity of the liquid film type or bleeding type container described later is set to 300 ml or less, particularly 150 ml or less.

In the present invention, as shown in FIG. 1A in particular, it is important that the inner surface of the trunk portion 1 has asymmetric slipperiness. That is, on the inner surface with different sliding properties, a difference in speed occurs in dropping the contents. For example, in the example of FIG. 1A, the inner surface 1a on one side of the body portion 1 has increased slipperiness, and the inner surface 1b on the other side has decreased slipperiness. As a result, the content 10 has a high drop speed on the inner surface 1a side and a lower drop speed on the inner surface 1b side.

On the other hand, in a conventionally known small-capacity container, the slipperiness of the inner surface of the container is usually uniform in the circumferential direction.
That is, in such a container, when the contents 10 are discharged while being held in an inverted state as shown in FIG. 2, the contents 10 fall evenly along the inner surface of the body 1. Before reaching the opening of the neck 3, it remains held in the container. In such a state, the air layer 13 is confined between the contents 10 and the bottom 5, and the atmospheric pressure is larger than the pressure of the air layer 13, so the contents 10 remain in the container. It becomes difficult to discharge.

However, according to the present invention, as shown in FIG. 1 (a), the slipperiness is formed asymmetrically, and there is a portion on the inner surface of the body portion 1 where the drop speed of the contents is different. Yes. Therefore, since the fall of the content 10 is not uniform, the air layer 13 between the content 10 and the bottom part 5 can be easily removed from the side where the thickness of the content 10 is thin (the 1b side where the fall speed is slow), for example. Therefore, the inconvenience that the contents 10 stay in the container and is difficult to be discharged is effectively avoided.

In the present invention, the form in which the sliding property is asymmetric as described above is not particularly limited as long as it causes a difference in the falling speed of the content 10, and any form may be used. That is, an area where the fall speed of the content 10 is high (area where the content 10 is quickly discharged) and an area where the fall speed of the content 10 is slow (area where the content 10 is discharged slowly) are As long as it is formed on the inner surface 1, it may have any form.

Further, in the form as shown in FIG. 1 (a), that is, the side 1a on which the falling speed of the contents 10 is fast and the side 1b on which the falling speed of the contents 10 is slow are located at positions facing each other. It is not limited, The form that 1a and 1b exist in the near position may be sufficient.

The above-mentioned small-sized container for viscous materials of irregular cross-section type is in principle made of any material such as plastic, glass, metal, etc. as long as it satisfies the condition that inner surfaces with different sliding properties are formed. However, in practice, it is desirable to be made of plastic from the viewpoint of molding.
Also, the form of the container is not particularly limited, but is preferably formed by hollow molding and has a form such as a bottle or tube in which the opening for discharging the contents is smaller than the cross section of the body part for storing the contents. Most preferably. That is, there is no problem in the discharge of the contents 10 in a wide-mouthed container or cup having an opening for discharging the contents larger than or equivalent to the trunk section.
For example, in the example of FIG. 1, the form of a blow molded container is shown, but a tube container may be used.

FIG. 3 shows a schematic plan sectional view of the body 1 of the liquid film type small capacity container.
This type of container differs from the type of container of FIG. 1 in that a liquid film 21 is formed on the inner surface of the body 1, and this liquid film 21 prevents the viscous content 10 (omitted in FIG. 3). Sliding property is given. In other words, the liquid forming the liquid film 21 functions as a lubricating liquid that improves the sliding property with respect to the contents 10.

As understood from FIG. 3, in the present invention, the thickness of the liquid film 21 formed on the inner surface of the body portion 1 of such a container is not uniform in the circumferential direction. And a region having a thin thickness t. The region having the thick thickness T and the region having the thin thickness t each extend in a strip shape in the axial direction of the container. As a result, in the region having the thickness T, the sliding speed is fast, and the contents 10 are quickly discharged. On the other hand, in the region having the thickness t, the sliding speed is low, and as a result, a discharge speed distribution as shown in FIG. Accordingly, the viscous content 10 flows into the region where the sliding speed is fast, and the thickness on the region where the sliding speed is slow becomes thin, and the air layer 13 between the content 10 and the bottom portion 5 becomes the content 10. Is effectively removed from the side where the thickness of the liquid is thin (the side where the liquid film 21 has the thin thickness t), and therefore the viscous content 10 stays in the container and is difficult to discharge. It will be avoided.

The liquid (lubricating liquid) that forms the liquid film 21 as described above is immiscible with the content 10 contained in the container and is non-volatile (for example, a boiling point of 200 ° C. or higher), Depending on the type of the content 10, a material exhibiting liquid repellency with respect to the content 10 is used. For example, edible oil (animal and vegetable oil), fatty acid triglyceride, fluorosurfactant, liquid paraffin, silicone oil and the like are representative, and a lubricating liquid can be selected from these according to the type of content 10. it can.

The liquid film type small-capacity container described above is basically applied to a plastic container whose inner surface is made of resin. This is because, by forming the inner surface of the container with a thermoplastic resin such as an olefin resin or polyester (particularly an olefin resin), the liquid film 21 made of the lubricating liquid can be stably held.
Moreover, the form of this type of container is also preferably a container having a small diameter of the mouth for discharging contents such as bottles and tubes, like the modified cross-section type shown in FIG.

Furthermore, as a method of forming the liquid film 21 having the thickness distribution as described above, a spray method is typical. For example, after forming a container, the liquid film 21 is formed on the inner surface of the container by spraying a lubricating liquid. At this time, the liquid film 21 having a thickness distribution can be easily formed by fixing the direction of the spray nozzle so that the portion where the thickness of the liquid film 21 is increased is directed and spraying.
In this case, the thickness distribution of the liquid film 21 may be determined in advance by conducting a laboratory test and setting spray conditions (spray pressure and discharge amount) so that the target content 10 is not clogged. .
Further, in a bleeding type small capacity container described below, it is possible to form the liquid film 21 having a thickness distribution by using a method of forming a lubricant-containing resin layer.

4 (a) and 4 (b) show schematic plan sectional views of the body 1 of a bleeding type small capacity container.
This type of container, unlike the type of container of FIGS. 1 and 3, has a structure in which the inner surface of the body 1 is formed by a lubricant-containing resin layer 23, and this lubricant has a viscous content. By sliding on the inner surface in contact with 10 (not shown in FIG. 4), slipping properties with respect to the viscous content 10 are imparted. That is, the lubricant in the lubricant-containing resin layer 23 that forms the inner surface of the container functions as a lubricant that improves the sliding property on the contents 10.

In such a bleeding type small-capacity container, in FIG. 4A, as in the liquid film type of FIG. 3, the lubricant-containing resin layer 23 is formed with a thickness distribution, and a region having a thick thickness T, A region having a thin thickness t is formed. That is, the region having the thick thickness T and the region having the thin thickness t each extend in a strip shape in the axial direction of the container, and the region having the thick thickness T has a large amount of lubricant that bleeds on the surface of the resin layer 23. Therefore, the sliding speed with respect to the content 10 is fast. On the other hand, in the region having a thin thickness t, the amount of lubricant that bleeds on the surface of the resin layer 23 is small, and therefore the sliding speed with respect to the content 10 is slow. Therefore, when the container is inverted, a discharge speed distribution as shown in FIG. 1A is generated, and the air present at the bottom of the container from the side where the lubricant-containing resin layer 23 has the thin thickness t. Is easily removed, and the inconvenience that the viscous content 10 stays in the container and is difficult to be discharged is effectively avoided.

In FIG. 4B, the thickness of the lubricant-containing resin layer 23 is uniform, but a concentration distribution is formed with respect to the amount of lubricant blended in the resin layer 23. For example, in the region 23a, the lubricant is present. The region 23a having a large amount of lubricant is extending in a strip shape in the axial direction of the container. That is, also in this embodiment, the region 23a where the amount of the lubricant is large has a high sliding speed with respect to the contents 10, so that when the container is inverted, a discharge speed distribution as shown in FIG. The disadvantage is that the air present at the bottom of the container easily escapes from the region where the amount of lubricant is small (the region other than the region 23a), and the viscous content 10 stays in the container, making it difficult to discharge. Effectively avoided.

In the embodiment of FIG. 4B, the lubricant concentration distribution is formed in the lubricant-containing resin layer 23 so as to form a sliding speed distribution that allows air to escape when the container is held in an inverted state. Just do it. That is, the lubricant may be blended only in the region 23a, and the lubricant may not be blended in the other regions.

In the present invention, as the above-mentioned lubricant, one that shows an effect of improving the slipping property on the viscous content by bleeding from the resin layer 23 is selected and used according to the type of the content. The following can be illustrated as a representative example of such a lubricant.

(A) Hydrocarbons such as fluidized, natural or synthetic paraffin, microwax, polyethylene wax, chlorinated polyethylene wax and the like.
(B) Fatty acids such as stearic acid and lauric acid.
(C) Aliphatic amides such as stearic acid amide, palmitic acid amide, oleic acid amide, erucic acid amide, methylene bis stearic acid amide, ethylene bis stearic acid amide, ethylene bis behenic acid amide, ethylene bis oleic acid amide .
(D) Fatty acid esters such as butyl stearate, hydrogenated castor oil, and ethylene glycol monostearate.
(E) Alcohols such as cetyl alcohol and stearyl alcohol.
(F) Metal soap such as zinc stearate and calcium stearate.
(G) Polyorganosiloxane.
(H) Glycerin fatty acid esters such as medium-chain fatty acid triglycerides, glycerin diacetomonooleate, glycerin trioleate, and decaglycerin oleate.
The above-mentioned lubricant is usually a solid, but includes a liquid substance that can be used for forming the liquid film 21, such as liquid paraffin. When such a liquid lubricant is used, a large amount thereof is blended, and when the amount of bleeding is increased, a liquid film 21 (that is, a continuous film) is formed to form a liquid film type container. When the amount is reduced and the lubricant molecules are distributed in the form of islands, it becomes a bleeding type container.

Of course, the above-described bleeding type small-capacity container is applied to a plastic container made of resin, and as the resin used for forming the lubricant-containing resin layer 23, a thermoplastic resin that can be molded into the container is used. In particular, olefinic resins and polyesters widely used in the field of packaging containers are preferably used.
Also in this type of container, the diameter of the mouth for discharging the contents such as bottles and tubes is small from the viewpoint that the contents 10 is a viscous substance and the contents 10 are discharged by being inverted or tilted. A container is preferred.

Furthermore, the method for forming the thickness distribution of the lubricant-containing resin layer 23 and the concentration distribution of the lubricant as described above is not limited to this, but the following methods are typical.

That is, when forming a thickness distribution in the lubricant-containing resin layer 23, for example, when a container is formed by extrusion molding, the shape of the circular die that forms the inner layer of the container is set so that the resin flow path width becomes uneven. You only have to set it.
This method can also be applied to the production of a liquid film type small capacity container. That is, if a lubricating liquid is blended with the resin formed on the inner surface of the container and extrusion is performed as described above, a thickness distribution can be formed in the liquid film 21 formed by bleeding.

Further, when forming the concentration distribution of the lubricant, prepare a composition in which a large amount of lubricant is blended with the resin forming the inner surface of the container and a resin composition in which the blending amount of the lubricant is small (or no lubricant is blended). By so-called stripe extrusion, a lubricant concentration distribution can be formed in the lubricant-containing resin layer 23.
This method is also applicable to the production of a liquid film type small capacity container. That is, if strip extrusion is performed using a composition in which the amount of the lubricating liquid contained in the resin formed on the inner surface of the container is large and a composition in which the amount is small (or not blended), the amount of the lubricating liquid is large. In the region formed by the resin composition, the thickness of the liquid film 21 is thick, and in the region formed by the resin composition having a small amount (or not blended), the liquid film 21 is thin (or the liquid film). 21 is not formed).

The thickness distribution and concentration distribution of the lubricant-containing resin layer 23 and the thickness of the lubricant-containing resin layer 23 are determined in advance so as to prevent clogging of the intended contents 10 by conducting a laboratory test in advance. Just keep it.

In the above-described liquid film type or bleeding type small-capacity container, the body wall of the container preferably has a multilayer structure including an intermediate layer of a gas barrier resin such as ethylene vinyl alcohol copolymer. In the case of a single layer structure, there is a risk that the lubricating liquid forming the liquid film 21 on the inner surface of the container or the lubricant in the lubricant-containing resin layer 23 on the inner surface of the container may pass through the body wall and bleed to the outer surface of the container. However, when the intermediate layer of the gas barrier resin is provided, the transfer of the lubricant or lubricant to the outer surface of the container can be blocked.

In the present invention, the content 10 to be stored in the container is a highly viscous paste-like material, specifically, a viscous paste-like content having a viscosity (25 ° C.) of 8 Pa · s or more. used. Many of such paste-like contents have a gel-like form, and are not limited to various foods but include pharmaceuticals and toothpastes.
Moreover, it is desirable that the small-capacity container of the present invention described above has a capacity larger than 70 ml. In other words, if the capacity is too small, the inner diameter of the mouth through which the contents are discharged may be considerably reduced, and the contents are discharged at different rates depending on the cross-sectional shape to avoid clogging in the container. Therefore, it is necessary to have a fairly complicated cross-sectional shape, and it is also difficult to form a distribution of the thickness of the lubricating liquid film, a distribution of the thickness of the lubricant-containing resin layer, and a distribution of the amount of the lubricant. This is because there is a risk of becoming.

The small-capacity container for viscous substances of the present invention is excellent in discharging contents by inversion, and is widely used for various applications by utilizing this.

1: trunk part 3: neck part 5: bottom part 10: contents 13: air layer 21: liquid film 23: resin layer containing lubricant

Claims

In a small-capacity container having an internal volume of 300 ml or less in which a viscous substance is accommodated,
On the inner surface of the body portion of the container, when the container is held in an inverted state, a region where the contents are discharged quickly and a region where the contents are discharged slowly are formed. Small capacity container for storage.
The inner surface of the body of the container has a non-axisymmetric shaped side section, and the formation of the shape side section causes the contents to be quickly discharged and the contents to be discharged slowly. The small-capacity container for viscous substances according to claim 1, wherein the region is formed.
A liquid film of a lubricating liquid that improves sliding properties against the viscous substance is formed on the inner surface of the body of the container, and the thickness of the liquid film is determined in the circumferential direction when viewed in a cross section of the body of the container. The viscosity according to claim 1, wherein the region in which the content is discharged quickly and the region in which the content is discharged slowly are formed by the non-uniformity of the liquid film thickness. Small capacity container for substances.
The container has a multilayer structure, and the inner surface of the container is formed of a lubricant-containing resin layer, and the thickness of the lubricant-containing resin layer is not circumferential in the circumferential direction of the container when viewed from the cross section of the body. The region where the content is discharged quickly and the region where the content is discharged slowly are formed by the non-uniformity of the thickness of the lubricant-containing resin layer. A small-capacity container for viscous substances.
The container has a multilayer structure, and the inner surface of the container is formed of a lubricant-containing resin layer, and the blending amount of the lubricant-containing resin layer is determined in the circumferential direction as seen in the torso plane cross section of the container. The region where the content is discharged quickly and the region where the content is discharged slowly are formed by non-uniformity of the blending amount of the lubricant-containing resin layer. The small-capacity container for viscous substances described.
2. The small-capacity container for viscous substances according to claim 1, wherein the viscous substance has a viscosity (25 ° C.) of 8 Pa · s or more.
The small-capacity container for viscous substances according to claim 6, which has a capacity larger than 70 ml.
7. The small-capacity container for viscous substances according to claim 6, wherein the contents are food, medicine, and toothpaste.
The small-capacity container for viscous substances according to claim 1, which is a hollow molded container.