JPH06345069A - Laminated layer separable bottle and production thereof - Google Patents

Abstract

PURPOSE:To provide a highly productive bottle wherein the provision of attaching parts between the inner and outer layers is unnecessary, the inner and outer layers are freely separated to perfectly prevent the deformation of the outer layer and an atmospheric air inlet hole can be easily formed in the outer layer. CONSTITUTION:In a bottle consisting of at least two separable layers, i.e., an outer layer 1 and an inner layer 2, the inner layer is higher in melting point than the outer layer and is formed from the synthetic resin material having a bending elastic modulus within the range of 10,000-50,000kg/cm<2> and an atmospheric air inlet hole 3 is formed only in the outer layer by a melting means 5 having the range of a temperature higher than the melting point of the outer layer and lower than that of the inner layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated release bottle in which an inner layer and an outer layer are freely peeled off, and a method for producing the laminated release bottle in which an air introduction hole can be easily formed in the outer layer.

[0002]

2. Description of the Related Art Conventionally, an inner layer and an outer layer can be separated,
There is known a laminated bottle in which only the inner layer is deformed due to the depressurization in the container and the change in the external shape of the container is prevented (for example, Japanese Patent Laid-Open No. 4-3393753). However, in the conventional laminated bottle, the inner layer and the outer layer are not completely separated from each other, and for example, an adhesive layer is provided at least in a portion including the neck portion and the bottle bottom portion. This is to prevent the inner layer from falling inside when a negative pressure is applied to the inner layer, to prevent the inner layer from separating during the mouth trimmer processing in the bottle manufacturing process, and to prevent the inner layer and outer layer from being separated. This is because it is necessary to prevent water and the like from entering in between.

However, when the adhesive layer is partially provided in this way, the peelability between the inner layer and the outer layer is not sufficiently exhibited, the characteristics of the laminated release bottle are not exhibited, and the inner layer shrinks due to a decrease in internal pressure. In doing so, the outer layer may also be pulled and deformed. Therefore, the outer layer must be thick enough to be stiff enough to withstand it. Further, for example, when a laminated peeling bottle is filled with shampoo or the like and is dispensed little by little by a pump dispenser configured so that air does not flow into the bottle, the inner layer and the outer layer of the bottle can be completely peeled off. If
The volume inside the inner layer gradually decreases according to the volume of the liquid dispensed, and the final content liquid can be almost completely poured out. There is a problem that it is difficult to shrink to a large amount and the residual liquid increases.

On the other hand, in the laminated release bottle, the inner layer and the outer layer are exposed to the atmosphere so that the outer layer is not deformed but the inner layer is deformed as the content decreases. Must be conducting. Therefore, conventionally, the air introduction hole is formed only in the outer layer. This air introduction hole cannot be provided at the time of molding the bottle and is opened by post-processing, but the bottle after molding is in a state where the outer layer and the inner layer are in close contact and laminated, and the hole is formed only in the outer layer. Drilling is difficult. As a method for making an air introduction hole only in the outer layer, conventionally, a suction pad formed at the tip of a flexible pipe is inserted into the bottle from the mouth of the bottle, and the inner layer facing the hole formation position with the suction pad. There is proposed a method of adsorbing a part of the above and forcibly pulling it from the outer layer to peel it off, and then perforating the outer layer with a drill from the outside in that state.

[0005]

As described above, since the conventional laminated release bottle is provided with an adhesive layer on a part thereof, it is difficult to completely pour out the content liquid and an adhesive layer is formed during production. However, there is a problem in that productivity is poor because the insertion and positioning of the suction pad are complicated in the process of forming the air introduction hole in the outer layer.

The present invention is intended to solve the above-mentioned conventional problems, and it is not necessary to provide an adhesive portion between the inner layer and the outer layer, so that the inner layer and the outer layer can be peeled freely and the outer layer can be removed. Deposition of layers can be completely prevented, the content liquid can be poured out almost completely, and the air introduction hole can be easily formed in the outer layer, so that the product can be manufactured with high productivity. An object is to provide a peeling bottle and a method for manufacturing the same.

[0007]

As a result of various studies to achieve the above-mentioned object, the present inventor has determined that a predetermined material can be used as the material for the inner layer without providing an adhesive between the outer layer and the inner layer. By selecting a material having a flexural modulus and / or forming a flange-shaped engaging piece at the upper end of the bottle mouth of the inner layer, we succeeded in obtaining a laminated release bottle that does not cause inconveniences such as the inner layer dropping. Moreover, even if the inner layer is not sucked from the inside of the bottle and forcedly peeled off, the air introduction hole can be easily formed only in the outer layer by utilizing the difference in melting points of the materials forming the outer layer and the inner layer. The inventors have found a method and arrived at the present invention.

That is, the laminated release bottle of the present invention comprises at least two layers of an outer layer and an inner layer, wherein the outer layer and the inner layer are peelable, and the inner layer is made of a material of the outer layer. High melting point and flexural modulus of 10,000 kg / cm ^{2 to} 50,000 kg / cm ² (ASTM D790
It is made of a synthetic resin material in the range (according to the measurement method), and an air introduction hole is formed in the outer layer. The larger the difference between the melting points of the inner layer and the outer layer is, the easier the temperature control of the melting means of the hole forming process when forming the air introduction hole to the outer layer is. Further, the higher the bending elastic modulus, the smaller the bending strain and the so-called rigidity, and the sinking of the inner layer is eliminated even if the adhesive portion is not provided between the inner layer and the outer layer. Therefore, the above range is preferable.

With the above construction, it is not necessary to provide an adhesive portion between the outer layer and the inner layer in order to prevent the inner layer from sinking, and the outer layer and the inner layer can be peeled off well. Further, it is more desirable to form an engagement piece such as a flange that engages with the bottle mouth portion of the outer layer at the bottle mouth portion such as the upper end of the bottle mouth of the inner layer. Further, in order to satisfactorily introduce the atmosphere between the inner layer and the outer layer, the air introduction holes are formed in a plurality, more preferably two symmetrically or three or more at equal intervals.

In the method for manufacturing a laminated release bottle of the present invention, the peelable bottle having at least two layers of an outer layer and an inner layer is made of different materials in which the inner layer has a higher melting point than the outer layer. Molded with synthetic resin material,
The atmosphere introducing hole is formed only in the outer layer by a melting means having a temperature range higher than the melting point of the outer layer and lower than the melting point of the inner layer. As the melting means, various means such as a hot rod, hot air, hot wire or a combination thereof can be adopted. Further, in order that the atmosphere is uniformly introduced between the inner layer and the outer layer and both layers are well separated, after forming the air introduction hole in the outer layer, the outer layer and the inner layer are passed through the air introduction hole. It is desirable that air is supplied between the two to separate the inner layer and the outer layer, and then air is supplied from the bottle mouth into the bottle to expand the inner layer to a predetermined volume.

[0011]

The inner layer is formed of a synthetic resin material having a high flexural modulus, or a flange is further formed at the upper end of the bottle mouth of the inner layer, without providing an adhesive portion between the inner layer and the outer layer. It became possible to form a peelable bottle with an inner layer and an outer layer. Therefore, the inner layer shrinks well in accordance with the reduced pressure, the deformation of the outer layer due to the reduced pressure in the bottle can be completely prevented, and the liquid filled in the bottle can be almost completely poured out. A container that can be obtained is obtained. And since the force due to the pressure reduction does not act on the outer layer, it becomes possible to make the outer layer thinner by that amount,
Material can be saved.

Further, since the inner layer is formed of a synthetic resin material having a higher melting point than that of the outer layer, by using a melting means having a temperature higher than that of the outer layer and lower than that of the inner layer, It is possible to perforate only the outer layer without melting the layer. Therefore, even if the inner layer is not separated from the outer layer in advance as in the conventional case, the through hole can be easily formed only in the outer layer, and the hole forming process can be greatly simplified. Further, since the laminated release bottle of the present invention does not use an adhesive between the outer layer and the inner layer, in the waste treatment after the bottle is used, the synthetic resin of the inner layer and the synthetic resin of the outer layer of different materials are used. Can be easily separated and recovered, can be easily recycled, and can save resources.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a laminated release bottle according to an example of the present invention, which is composed of an outer layer 1 and an inner layer 2, and the outer layer 1 and the inner layer 2 have a weight ratio of about 9: 1. Is formed thick. Both the outer layer 1 and the inner layer 2 may be a single synthetic resin layer or a composite layer, but at least the inner layer 2 needs to be formed of a material having a higher melting point than the outer layer 1, and the inner layer further comprises It is required to be formed of a material having a high flexural modulus.

As materials satisfying these conditions, polypropylene, high-density polyethylene, linear low-density polyethylene, low-density polyethylene, etc. can be adopted as the material of the outer layer, and polycarbonate, polyacetal, polyarylate, nylon are used as the material of the inner layer. 6, nylon 66, copolymer nylon, nylon 12, PET, PETG, M
x Nylon, polyacrylonitrile (PAN), etc. can be adopted. The material of the outer layer has a melting point of about 110-150.
Compared to a material with a relatively low melting point in the range of ° C,
The inner layer material is a material having a relatively high melting point and a melting point of about 170 to 255 ° C. Therefore, when these materials are used in combination, there is a significant difference in melting point between the inner layer and the outer layer, but it is desirable to appropriately combine them so that the difference in melting point is about 90 ° C. or more. As a result, it becomes easy to open the air introduction hole in the outer layer described later.

The bending elastic modulus of the material of the inner layer is
Approximately 22,000 kg / cm ² (polycarbonate), excluding Nylon 12, measured by ASTM D790
˜45,000 Kg / cm ² (Mx nylon), and the outer layer material has a flexural modulus of about 1500 to 1400.
Compared with the range of 0 kg / cm ^2, the material has a particularly high flexural modulus, little bending strain, and so-called strong material. From the above viewpoint, in this embodiment, the outer layer material is made of high-density polypropylene (melting point: 130 to 135).
℃, flexural modulus 8000 to 14000 kg / cm ² ), nylon 6 as the inner layer material (melting point 245 ℃, flexural modulus 25
000 kg / cm ² ) was adopted.

Reference numeral 3 in the drawing denotes an air introduction hole formed only in the outer layer at the screw portion position of the bottle mouth. Although it is shown only on one side in the drawing, it is formed symmetrically at two places around the bottle mouth center. Has been done. In the laminated release bottle of this embodiment, the air introduction hole 3 is formed in the bottle mouth portion where the cap is attached so as not to be conspicuous. However, the air introduction hole 3 may be a body portion, a bottom portion or the like at a position where air can flow. It can be provided at any place, and in another embodiment shown in FIG. 4, an atmosphere introduction hole 9 is formed in the bottle body shoulder portion.

The laminated release bottle having the above-mentioned structure is manufactured by first co-extruding the inner layer and the outer layer made of the above-mentioned materials into a bottle by a blow molding method, and after the molding, finish the bottle mouth portion. To process. Next, two air introduction holes are formed in the cap engagement port screw portion of the bottle only in the outer layer, in contrast. In the present embodiment, the formation of the air introduction hole is such that the temperature is higher than the melting point of the outer layer material and is about 150 ° C., which is lower than the melting point of the inner layer material, and the tip is dome-shaped. The heating is performed by pressing the heat rod 5 against the outer layer 1 from the outside and melting it. After melting the outer layer, the tip of the heat rod 5 abuts against the inner layer surface as shown in FIG. 1B, but since it is lower than the melting temperature of the inner layer 2, the inner layer can be simply pushed a little as shown. Never melt. Therefore, it is possible to easily open the air introduction hole 3 only in the outer layer without separating the inner layer from the outer layer in advance as in the conventional case.

As described above, the air introduction hole 3 is formed only in the outer layer, but since the inner layer 2 and the outer layer 1 are in close contact with each other in the molded state, the air introduction hole is simply formed in the outer layer. In such a state, the atmosphere is difficult to be introduced between the inner layer and the outer layer during the pouring of the contents, especially in the initial stage, and the inner layer and the outer layer may not be separated and the outer layer may be deformed. . In order to prevent this, in this embodiment, after the air introduction hole 3 is formed, air is forcibly sent between the inner layer 2 and the outer layer 1 through the air introduction hole 3 to separate the outer layer and the inner layer. Peeling is performed, and then air is blown into the bottle from the bottle mouth to inflate the inner layer again to discharge the atmosphere between the inner layer and the outer layer, and the inner layer is adjusted to a predetermined volume. 2 and 3 show the process, and FIG. 2 shows a state in which a little air is put between the outer layer and the inner layer,
In this state, an enlarged view of the bottle shoulder portion B (c)
The inner layer and outer layer are separated as shown in Fig.
The parts are still in close contact. In FIG. 3, air is blown sufficiently between the inner layer and the outer layer so that the outer layer and the inner layer are completely separated, and then air is blown into the inner layer from the bottle mouth to inflate the inner layer again. The state adjusted to capacity is shown. In this state, an air introduction gap is formed between the inner layer and the outer layer, and the inner layer and the outer layer are easily separated or easily separated from each other. Thus, once the inner layer and the outer layer, which are in close contact with each other after molding, are separated once, the air flow improves, and the atmosphere is easily introduced from the next onward, and the inner layer is reduced as the content liquid decreases. It reliably peels off and shrinks, and the outer layer does not deform.

In this embodiment, air is blown into the inner layer from the bottle mouth to adjust the capacity of the inner layer.
When air is blown between the inner layer and the outer layer, if the amount of blown air is controlled to such an extent that the inner layer and the outer layer are separated and the inner layer maintains a substantially predetermined volume, it is not always necessary from the bottle mouth after that. No air blowing is required. Also,
In the process of making an air introduction hole in the outer layer of the bottle, if you use a heat rod with an air blowout hole in the center and blow out air from the tip of the heat rod at the same time as opening the hole, the inside facing the hole The layers can be forced to be separated by air to protect the inner layer from the heat of the tip of the heating rod and air can be blown between the inner and outer layers to separate the inner and outer layers. Therefore, in that case, it is possible to omit the air blowing step after the holes are formed.

The laminated peeling bottle manufactured as described above is filled with shampoo and the bottle mouth is loaded with a pump dispenser having a structure that does not allow air to enter the bottle, and the contents are poured little by little. As a result of carrying out the experiment, it was possible to satisfactorily pour the outer layer without any deformation. When the bottle was cut and observed after the pouring was completed, the inner layer was almost completely contracted except for the portion where the pump dispenser was fitted, and the remaining amount of the content liquid was hardly observed. . In addition, neither the inner layer fell from the mouth end of the bottle nor the inner layer surface facing the air introduction hole of the outer layer was damaged by heat.

5 to 8 respectively show other embodiments of the laminated release bottle of the present invention, in which the inner layer and the outer layer are simply laminated in the radial direction at the bottle mouth. Instead, the inner layer provides resistance to axial movement relative to the outer layer at the bottle mouth end,
An engagement piece that engages the inner layer and the outer layer is formed between the inner layer and the outer layer so that water or the like is unlikely to enter from the bottle mouth end portion. In these embodiments, unique drawing symbols are used only for the characteristic points, and other parts are given the same reference numerals as those in the embodiment of FIG.

In the embodiment of FIG. 5, as clearly shown in the enlarged view (b), the inner layer 2 is bent at a right angle to the bottle mouth end portion and overlaps with the outer layer mouth end surface. A mating flange-shaped engaging piece 10 was formed. In the embodiment of FIG. 6, a crank-shaped flange-shaped engagement piece 15 is also formed on the bottle mouth end of the outer layer 1 so that the bottle mouth end of the inner layer 2 matches the engagement piece of the outer layer 1. Thus, the crank-shaped flange-shaped engagement piece 16 was formed. In the embodiment of FIG. 7, the crank-shaped flange-shaped engaging piece 20 is formed at the bottle mouth end of the outer layer 1 as in the above embodiment, and the outer layer 1 is engaged at the bottle mouth end of the inner layer 2. The tip was further bent at a right angle so that the upper end surface of the joint piece 20 was fitted to form a two-step flange-shaped engagement piece 21.

In the embodiment of FIG. 8, the tapered engagement piece 2 is provided at the bottle mouth end of the outer layer 1 and the bottle mouth end of the inner layer 2.
5 and 26 are formed, and the engagement pieces 26 of the inner layer are configured to engage with the upper surfaces of the engagement pieces 25 of the outer layer. Further, in the embodiment of FIG. 9, undercut portions 30 and 31 are formed in the bottle mouth portion of the outer layer 1 and the bottle mouth portion of the inner layer 2, and the inner layer 2 is engaged with the outer layer 3 at the undercut portions. The engaging piece is formed. As described above, by providing the engaging piece that engages with the outer layer at the bottle mouth end portion or the bottle mouth portion of the inner layer, it is more reliable without providing an adhesive layer near the bottle mouth portion as in the conventional case. Moreover, it is possible to more reliably prevent the subsidence of the inner layer and the entry of water from the bottle mouth into the space between the inner layer and the outer layer.

[0024]

The present invention has the following special effects. Since the inner layer and the outer layer are not provided with an adhesive portion, they are easy to manufacture, and the inner layer peels well from the outer layer according to the reduced pressure, and it is possible to reliably prevent the deformation of the outer layer and the bottle. The liquid filled inside can be poured out almost completely. And since the force due to the pressure reduction does not act on the outer layer, it becomes possible to make the outer layer thinner by that amount,
Material can be saved. In addition, since no adhesive is used between the outer layer and the inner layer, it is possible to easily separate and collect the synthetic resin of the inner layer and the synthetic resin of the outer layer, which are different in materials, in the waste treatment after the bottle is used. It is easy to recycle and can save resources.

Further, since the inner layer is made of a synthetic resin material having a higher melting point than the outer layer, and the atmospheric introduction hole is formed in the outer layer by melting by utilizing the difference in the melting points, the inner layer is previously formed on the outer side in a conventional manner. Even if it is not peeled from the layer, the air introduction hole can be easily and surely formed only in the outer layer, and the productivity can be improved. Furthermore, by forcibly blowing air between the inner layer and the outer layer to separate the inner layer from the outer layer after forming the air introduction hole, the inner layer can be more surely removed according to the pressure reduction in the bottle. It can be peeled off, and the deformation of the outer layer can be reliably prevented.

[Brief description of drawings]

FIG. 1 (a) is a front view of a laminated release bottle according to an embodiment of the present invention in one side cross-section, and FIG. 1 (b) is an enlarged view of part A thereof.

2 (a) is a front view of one side cross section of the laminated release bottle of FIG. 1 in which a small amount of air is blown between the outer layer and the inner layer, (b) is an enlarged view of part A thereof, (c). Is an enlarged view of the B portion, and (d) is an enlarged view of the C portion.

3 (a) is a front view of one side cross-section of the laminated release bottle of FIG. 1 in which air is blown between the outer layer and the inner layer to adjust the inner layer to a predetermined capacity, and FIG. An enlarged view of a portion, (c) is an enlarged view of the B portion.

FIG. 4 (a) is a front view of a laminated release bottle according to another embodiment of the present invention in a one-sided cross section, and FIG. 4 (b) is an enlarged view of part A thereof.

FIG. 5 is a sectional view of a bottle mouth end portion of a laminated release bottle according to still another embodiment of the present invention.

FIG. 6 is a sectional view of a bottle mouth end portion of a laminated release bottle according to still another embodiment of the present invention.

FIG. 7 is a sectional view of a bottle mouth end portion of a laminated release bottle according to still another embodiment of the present invention.

FIG. 8 is a cross-sectional view of a bottle mouth end portion of a laminated release bottle according to still another embodiment of the present invention.

FIG. 9 is a cross-sectional view of a bottle mouth end portion of a laminated release bottle according to still another embodiment of the present invention.

[Explanation of symbols]

 1 Outer Layer 2 Inner Layer 3 Atmosphere Introducing Hole 5 Heat Rod 10, 16, 21, 26, 31 Engaging Piece

Claims (8)

[Claims] 1. A laminated release bottle comprising at least two layers, an outer layer and an inner layer, wherein the outer layer and the inner layer are peelable, wherein the inner layer has a higher melting point than the material of the outer layer and has a flexural modulus. Is 10,000 kg / cm ^{2 to} 50,000
A laminated release bottle, which is made of a synthetic resin material in the range of 00 kg / cm ² (according to ASTM D790 measurement method) and has an air introduction hole formed in the outer layer. 2. The laminated release bottle according to claim 1, wherein the outer layer and the inner layer have no adhesive portion to each other. 3. The laminated release bottle according to claim 1, wherein an engagement piece that engages with the bottle mouth portion of the outer layer is formed at the bottle mouth portion of the inner layer. 4. The laminated release bottle according to claim 1, wherein a plurality of the air introduction holes are formed. 5. A peelable bottle consisting of at least two layers, an outer layer and an inner layer, is molded from synthetic resin materials of different materials in which the inner layer has a higher melting point than the outer layer, A method for producing a laminated release bottle, wherein the atmosphere introducing hole is formed only in the outer layer by a melting means having a temperature in a temperature range higher than the melting point and lower than the melting point of the inner layer. 6. The method for manufacturing a laminated release bottle according to claim 5, wherein the melting means is a hot rod. 7. The method for producing a laminated release bottle according to claim 6, wherein the melting means blows hot air from the tip of the hot rod. 8. After forming an air introduction hole in the outer layer, air is supplied between the outer layer and the inner layer through the air introduction hole to separate the inner layer and the outer layer, and then the bottle is opened from the bottle mouth. The method for producing a laminated release bottle according to claim 5, 6 or 7, wherein air is supplied to the inside to expand the inner layer to a predetermined volume.