GB2159116A - Flexible containers - Google Patents
Flexible containers Download PDFInfo
- Publication number
- GB2159116A GB2159116A GB8413477A GB8413477A GB2159116A GB 2159116 A GB2159116 A GB 2159116A GB 8413477 A GB8413477 A GB 8413477A GB 8413477 A GB8413477 A GB 8413477A GB 2159116 A GB2159116 A GB 2159116A
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- GB
- United Kingdom
- Prior art keywords
- vessel
- content
- log
- stands
- viscosity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 229920002457 flexible plastic Polymers 0.000 claims abstract description 5
- 235000015113 tomato pastes and purées Nutrition 0.000 abstract description 11
- 238000003825 pressing Methods 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract 3
- 241001291279 Solanum galapagense Species 0.000 abstract 1
- 239000011345 viscous material Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 description 13
- 239000011347 resin Substances 0.000 description 13
- -1 polypropylene Polymers 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 230000004888 barrier function Effects 0.000 description 9
- 239000011888 foil Substances 0.000 description 9
- 239000010410 layer Substances 0.000 description 9
- 230000003405 preventing effect Effects 0.000 description 8
- 239000004698 Polyethylene Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000006071 cream Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229920005672 polyolefin resin Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 235000010746 mayonnaise Nutrition 0.000 description 2
- 239000008268 mayonnaise Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- GRYSXUXXBDSYRT-WOUKDFQISA-N (2r,3r,4r,5r)-2-(hydroxymethyl)-4-methoxy-5-[6-(methylamino)purin-9-yl]oxolan-3-ol Chemical compound C1=NC=2C(NC)=NC=NC=2N1[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1OC GRYSXUXXBDSYRT-WOUKDFQISA-N 0.000 description 1
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- CONKBQPVFMXDOV-QHCPKHFHSA-N 6-[(5S)-5-[[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]methyl]-2-oxo-1,3-oxazolidin-3-yl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C[C@H]1CN(C(O1)=O)C1=CC2=C(NC(O2)=O)C=C1 CONKBQPVFMXDOV-QHCPKHFHSA-N 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 241000183024 Populus tremula Species 0.000 description 1
- 244000061456 Solanum tuberosum Species 0.000 description 1
- 235000002595 Solanum tuberosum Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 235000019219 chocolate Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 230000003340 mental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 235000021400 peanut butter Nutrition 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000005028 tinplate Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D35/00—Pliable tubular containers adapted to be permanently or temporarily deformed to expel contents, e.g. collapsible tubes for toothpaste or other plastic or semi-liquid material; Holders therefor
- B65D35/02—Body construction
- B65D35/04—Body construction made in one piece
- B65D35/08—Body construction made in one piece from plastics material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
- Tubes (AREA)
- Closures For Containers (AREA)
Abstract
A squeeze package comprises a flexible plastic hollow vessel containing a viscous substance e.g. tomato paste, the hollow vessel comprising a flexible cylindrical barrel, a narrowed orifice passage 8 connected to the barrel through a shoulder 5 and a residence portion 10 connected to the orifice passage through a stepped portion 9 and having a squeeze opening 6 on the top end thereof. The substance has a viscosity of 1,000 to 250,000 cP, and the dimension of the vessel and the viscosity of the substance are within the range satisfying the requirements represented by the following formulae: log eta >/= -log l -log S1/S0 + 5.45, log eta >/= 0.588 log S0 + 0.764 log E + 2.30, and S1/S0 ??? 2 wherein eta stands for the viscosity (cP) of the substance, S0 stands for the cross sectional area (mm<2>) of the orifice passage, S1 stands for the cross sectional area (mm<2>) of the residence portion, l stands for the length of the residence portion in the axial direction and E stands for the elastic recovery (g) of the cylindrical barrel in the non-packed state. The narrowed orifice passage helps prevent air from being sucked into the container as the container returns to its original shape when the pressing force is released. <IMAGE>
Description
SPECIFICATION
Squeeze package
Background of the Invention (1) Field of the Invention:
The present invention relates to a squeeze package for squeezing out a content. More particularly, the present invention relates to a squeeze package comprisinq a flexible plastic hollow squeeze vessel, such as a tube, and a viscous content packed in the vessel, which is excellent in the squeezability and has a high effect of preventing the air-back phenomenon.
(2) Description ofthe Prior Art:
It has been pointed out that conventional plastic squeeze tubes are insufficient in the squeezability and are defective in that the air-back phenomenon is caused. In a tube of this type, if the tube is pressed to squeeze out a content and this pressing force is released, the tube tends to restore the original shape and therefore, not only the content left on the top end of the squeeze opening but also air is sucked into the cylindrical barrel of the tube. Since suction of outer air is caused before re-sealing of the tube with a cap, the content in the tube is caused to fall in contact with outer air thus sucked in the tube, with the result that various troubles, for example, deterioration, discoloration and reduction of the taste or flavor are caused by oxygen or microorganism present in the air.Furthermore, when the package is used again, desired squeezing of the content cannot be attained unless sucked air is removed, or the content is violently discharged simultaneously with air and the content is scattered.
Summary of the Invention
It is therefore a primary object of the present invention to provide a squeeze package for squeezing out a content, in which the above-mentioned defects are overcome.
Another object of the present invention is to provide a squeeze package which has an excellent squeezability and a high effect of preventing the air-back phenomenon while it comprises a vessel having a simple shape and a simple structure.
More specifically, in accordance with the present invention, there is provided a squeeze package com- prising a flexible plastic hollow vessel and a viscous content packed in the vessel, wherein the hollow vessel comprises a flexible cylindrical barrel, a narrowed orifice passage connected to the barrel through a shoulder and a residence portion connected to the orifice passage through a stepped portion and having a squeeze opening on the top end thereof, the content has a viscosity of 1,000 to 250,000 cP, and the dimension of the vessel and the viscosity of the content are within the range satisfying the requirements represented by the following formulae:: logn 5 -logi - logS,iS, + 5.45 (1), logrl 0.588logS0+ 0.7641ogE t 2.30 (2), and S,/S0 -2 (3).
wherein n stands for the viscosity (cP) of the content, SG stands for the sectional area (mm2) of the orifice passage, S, stands for the sectional area (mm2) of the residence portion, t stands for the length of the residence portion in the axial direction and E stands for the elastic recovery (g) of the cylindrical barrel in the non-packed state.
Incidentally, the flexible plastic hollow vessel in the present invention is a vessel for squeezing out a packed content by pressing the wall of the vessel, and this vessel may be in the form of a tubular vessel, a hollow-formed bottle or the like.
Brief Description of the Drawings
Figure 1 is a plane view showing an embodiment of the package of the present invention
Figure 2 is a sectional view of the package shown in Fig. 1.
Figure 3 is an enlarged sectional view of the package of Fig. 1.
Figure 4 is an enlarged view showing the section taken along the line IV-IV in Fig. 1.
Figure 5-A is a diagram illustrating an example of the state where a viscous content is backed.
Figure 5-A is a diagram illustrating another example of the state where a viscous content is backed.
Figure 5-C is a diagram showing dimensions of respective parts.
Figures 6-A and 6-B are graphs illustrating the presence or absence of the air-back phenomenon with reference to the relation between the viscosity of the content and the length of the residence portion.
Figures 7-A, 7-B and 7-C are graphs illustrating the presence or absence of the air-back phenomenon with reference to the relation between the viscosity of the content and the sectional area of the orifice passage.
Figure 8 is an enlarged sectional view illustrating the laminate structure of a wall of a tubular vessel.
Figure 9 is a plane view showing another example of the tubular vessel used in the present invention.
Figures 10-A, 10-B and 10-C are sectional views showing examples of the sectional shape of the orifice passage.
Figure 11-A is a perspective view showing the main portion of a tubular vessel according to another modification of the present invention.
Figure 1 1-B is a perspective view showing the section taken along the line A-A of the tubular vessel shown in Fig. 11-B.
Detailed Description of the Preferred Embodiments
The present invention will now be described in detail with reference to the accompanying drawings.
Referring to Figs 1 and 2 illustrating an embodiment of the package of the present invention, this package comprises a tubular vessel 1, a lid 2 and a content packed in the vessel 1. This tubular vessel 1 comprises a flexible cylindrical barrel 4, a shoulder 5 connected to the barrel 4 and a squeeze opening 6, and a bottom seam 7 is formed on the other end of the cylindrical barrel.
In the present invention, as shown in enlarged views of Figs. 3 and 4, between the shoulder 5 and the squeeze opening 6, there are fnrmed a narrowed orifice passage 8 and a residence portion 10 connected to the orifice passage 8 througn a stepped portion 9 and having a squeeze opening 6.
In this embodiment, the tubular vessel 1 is formed by blow molding (hollow molding) of a thermoplastic resin parison so that the respective parts are integrated, and the orifice passage 8 is formed by engaging the parison with a mold to reduce the diameter of the parison. In this embodiment, as shown in Fig.
4, the section of the orifice passage 8 has a square shape, and the section of the residence portion 10 has a circular shape. Of course, the sectional shapes are not limited to these shapes but optional.
Incidentally, in this embodiment, the orifice passage 8 is formed by narrowing the intermediate portions other than four projections 9a to form steps 9.
In the present invention, the content 3 packed in the tubular vessel has a viscosity of 1,000 to 250,000 cP, especially 5,000 to 150,000 cP, in the application state.
In the present invention, the dimension of the vessel and the viscosity of the content are determined so that the requirements represented by the following formulae are satisfied: loga -iogt - lOgS1S9 5.45 (1) logrl 0.588 logS0 + 0.764 logE * 2.30 (2), and SilSo ' 2 (3)
wherein m stands for the viscosity (cP) of the content, So stands for the sectional area (mm2) of the orifice passage, S, stands for the sectional area (mm2) of the residence portion, f stands for the length of the residence portion in the axial direction and E stands for the elastic recovery (g) of the cylindrical barrel in the non-packed state.
When the cylindrical barrel 4 of the package having the tubular vessel packed with the content is pressed to squeeze out the viscous content from the opening 6 and the pressing force to the cylindrical barrel 4 is released, the state as shown in Figs. 5-A and 5-B is observed. More specifically, referring to
Fig. 5-A, in the state where the content is squeezed out by pressing the cylindrical barrel 4, the top end of the content is located at the position F0 overlapping the plane of the opening 6. However, if this pressing force is released, the viscous content 3 in the residence portion 10 is sucked in the cylindrical barrel 4 and the top end of the content comes to have a face F1 of revolution of a parabola having a concave center as shown in Fig. 5-A.If the viscous content 3 is further sucked, as shown in Fig. 5-B, the central portion of the content 3 is strongly sucked and an air passage 11 is finally formed. In the state where the air passage 11 is formed, air is sucked in the tubular vessel and as described hereinbefore, air falls in contact with the content over a broad area, resulting in occurrence of various deteriorations.
In the present invention, it is important that during a period of about 20 seconds ranging from the point of using the content by squeezing out the content to the point of re-sealing by capping the vessel with the lid 2, the top end face of the viscous content in the residence portion 10 should be located on the side of the squeeze opening apart from the critical position F2 shown in Fig. 5-C.
Referring to Fig. 5-C, the flow volume V0 of the viscous content sucked through the orifice passage 8 during the above-mentioned period is proportional to the sectional area S" of the passage 8 and is in inverse proportion to the viscosity r} of the content, and therefore, the flow volume V0 is represented by the following formula: :
So V0 = k1- t4-1) Furthermore, since the top end face F2 of the viscous content is regarded as being proximate to a conical face, supposing that the height of the conical face is h and the area of the bottom face (this area is equal to the sectional area of the residence portion) is S1, the flow volume V0 is expressed by the following formula; VO = k2S1h (4-2)
Since the value of (f-h) is equal to-zero (t-h .eq 0) at the above-mentioned critical. position, the fol lowing relation is established:
The logarithm of this formula is represented as follows::
In the above formulae, each of k1, k2 and k3 is a constant, The value of log k3 calculated from the experi
mental results is 5.45.
The above-mentioned line la and the experimental results are plotted on Figs. 6-A and 6-B in which
the ordinate indicates the viscosity 11 of the content and the abscissa indicates the length e of the resi
dence portion 10 in the axial direction. Fig. 6-A shows the results obtained when Si/So is 16 and Fig. 6-B
shows the results obtained when Si/So is 4. Marks 0 indicate that the state of the viscous content in the
vessel after 30 seconds from the point of squeezing of the content is as shown in Fig. 5-A, and marks X
indicate that the state of the viscous content in the vessel after 30 seconds from the point of squeezinq of
the content is as shown in Fig. 5-B.
From the results shown in Fig. 6-A and 6-B, it is obvious that the above formula (la) has a critical
significance for preventing occurrence of the air-back phenomenon. Namely, if the dimension of the ves sel and the viscosity of the content are determined so that the requirement of the formula (1) is satisfied,
occurrence of the air-back phenomenon can be prevented.More specifically, if the viscosity of the con
tent is constant, increase of the length ;11 of the residence portion 10 in the axial direction and the ratio S,/S0 of the sectional area of the residence portion to the sectional area of the orifice is effective for pre
venting occurrence of the air-back phenomenon, and if the dimension of the vessel is constant, increase
of the viscosity of the content is effective for preventing occurrence of the air-back phenomenon.
In the present invention, it is important that the viscosity 9 of the content, the sectional area SO of the
orifice passage and the elastic recovery E of the barrel of the tubular vessel should be selected so that the requirement of the empirical formula (2) is satisfied.
The experimental results are plotted on Figs. 7-A, 7-B and 7-C in which the ordinate indicates the vis
cosity a of the content and the abscissa indicates the sectional area So of the orifice passage 8. Fig. 7-A
shows the results obtained when the elastic recovery E of the barrel is 100 g, Fig. 7-B shows the results
obtained when the elastic recovery E of the barrel is 200 g, and Fig. 7-C shows the results obtained when
the elastic recovery E is 50 g. Marks Q indicate that the state of the viscous content after 20 seconds
from the point of squeezing of the content is as shown in Fiq. 5-A, and marks X indicate that the state of the viscous content in the vessel after 20 seconds from the point of squeezing of the content is s shown
in Fig. 5-B.
From the results shown in Figs. 7-A, 7-B and 7-C, it is obvious that also the formula (2) has a critical
significance for preventing occurrence of the air-back phenomenon, and occurrence of the air-back phe
nomenon is effectively prevented in the region above the following formula:
log a = 0.588 logS0 + 0.764 iogE + 2.30 (2a)
Namely, if the viscosity of the content is constant, reduction of the sectional area So of the orifice passage or reduction of the elastic recovery of the barrel 4 is effective for preventing occurrence of the air
back phenomenon.
In the present invention, it is important that when the pressing force to the barrel 4 of the tubular vessel is released and the viscous content in the residence portion 10 is sucked into the interior of the vessel, in order to cause such a volume reduction that the top end of the viscous content comes to have
a face F, of revolution of a parabola or a conical face Ft, as shown in Fig 5-A, the residence portion 10
should have a relatively large sectional area S,, the orifice passage 8 should have a relatively small sectional area So and a stepped portion should be formed between the residence portion 10 and the orifice
passage 8.When the opening of the tubular vessel has a straight section, attainment of an air-back phe
nomenon-preventing effect by causing such a volume reduction as bringing down the entire top end face
of the content cannot be attained at all.
In the present invention, a satisfactory effect of preventino occurrence of the air-back phenomenon can
be attained by adjusting the sectional area ratio Si/So to at least 2, especially at least 3. If this sectional
area ratio S1/SO is too large, the squeeze property of the vessel is reduced and the shape of the vessel
becomes bad. Accordingly, it is preferred that the sectional area ratio S1/S0 be not larger than 20, espe
cially not larger than 10.
From the foregoing description, it is obvious that in the present invention, occurrence of the air-back
phenomenon can be prevented by forming the orifice passage 8 and residence portion 10 and determin
ing the values of So, Si/So and t so that the requirements of the formulae (1), (2) and (3) are satisfied, even if the viscosity N of the content 3 is relatively low and the elastic recovery E of the tubular vessel is relatively large.
In the present invention, the tubular vessel 1 may be formed of an optional material. For example, the tubular vessel 1 may be composed of a plastic material, a metal foil, a laminate thereof or a laminate of a plastic material or metal foil with paper.
As the plastic material, there can be mentioned olefin resins such as low density polyethylene, medium density polyethylene or high density polyethylene, isotactic polypropylene, a crystalline ethylene-propylene copolymer, an ethylene-vinyl acetate copolymer and an ion-crosslinked olefin copolymer, nylon resins such as nylon 6, nylon 6,6 and nylon 12, polyesters such as polyethylene terephthalate and polybutylene terephthalate, vinyl chloride resins, vinylidene chloride resins, and a styrene-butadiene copolymer, a styrene-butadiene-acrylonitrile copolymer and an ethylene-vinyl alcohol copolymer. As the metal foil, there can be mentioned an aluminum foil, a tinplate foil, an iron foil and a steel foil.
According to the present invention, a squeeze vessel excellent in the effect of preventing occurrence of the air-back phenomenon can be prepared by using a plastic material which has a high gas barrier property but is not suitable for the production of a conventional squeeze vessel of this type because of a relatively large elastic recovery, for example, a vinyl chloride resin, a vinylidene chloride resin, a highnitrile resin, a polyester or a polyamide.
Of course, a resin poor in the gas barrier property, for example, an olefin resin, may be used for attaining the objects of the present invention after coating with a gas-barrier resin such as a vinylidene chloride resin or in the form of a laminate with a gas barrier resin or a metal foil.
Fig. 8 illustrates the sectional structure of a laminate 12 constituting the tubular vessel 1. This laminate 12 comprises a gas barrier layer 12 and inner and outer surface layers 14 and 15 composed of an olefin resin. The gas barrier layer 13 is laminated and bonded onto the inner and outer surface layers 14 and 15 through adhesive layers 16a and 16b. The gas barrier layer 13 may be composed of a metal foil such as an aluminum foil or a gas barrier resin such as a vinylidene chloride resin.
In the present invention, in the case where the tubular vessel 1 is composed solely of a plastic material, all the portions of the vessel can be prepared by hollow forming of a parison as shown in Figs. 1 and 2. Of course, the tubular vessel 1 may be formed according to a method in which as shown in Fig. 9, a cylindrical barrel 4 of the tubular vessel 1 is formed by curling a laminate sheet as described above into a cylinder and heat-sealing the confronting edges of the cylinder to form a straight seam 17, a shoulder 5, an orifice passage 8 and a residence portion 10 are integrally formed by injection molding of a plastic material, and one open end of the cylindrical barrel is fusion-bonded to the shoulder by means of ultrasonic fusion bonding or the like to form a circumferential seam 18.
Referring to Figs. 11-A and 11-B illustrating another modification of the tubular vessel of the present invention, the neck between the extrusion opening 6 and shoulder 5 is divided into upper and lower parts in the portion corresponding to the orifice passage 8, and the upper part 9b has a smooth short cylindrical shape and a cap-engaging male screw 9d is formed on the lower part 9c.
Not only a shape shown in Fig. 4 but also a circular shape shown in Fig. 10-A, a star-like shape shown in Fig. 10-B or other shape can optionally be adopted for the orifice passage 8. Moreover, as shown in
Fig. 10-C, an inner plug 19 may be inserted into the opening 6 of the tubular vessel and a cross-shaped orifice passage 8 may be formed in the bottom portion of the inner plug. In this case, many projections 20 formed by cross-cutting are opened in the squeezing direction when the content is squeezed out, and the squeeze property is advantageously improved.
The present invention will now be described in detail with reference to the following Examples that by no means limit the scope of the invention.
Example 1 and Comparative Example 1
A tomato paste was packed in a soft circular vessel of a laminate composed mainly of low density polyethylene and including an oxygen barrier layer, which had a volume of 500 cc and in which the sectional area of the opening of the residence portion was 16 mm2, the length of the residence portion was 12 mm and the sectional area of the orifice passage was 4 mm,s2, and the vessel was repeatedly pressed for squeezing out the tomato paste.
The tomato paste could be squeezed out smoothly without return of the vessel until all the tomato paste was consumed. The restoring force produced when the vessel was pressed and the pressing force was released was 87 g at largest. The viscosity of the tomato paste at the time of use was 35,000 cP as measured by a Brookfield rotational viscometer.
For comparison, a tomato paste was packed in a relatively rigid circular vessel of a laminate composed mainly of polypropylene and including an oxygen barrier layer, which had a volume of 500 cc and the same opening and orifice dimensions as those of the vessel of Example 1, and the vessel was repeatedly pressed for squeezing out the tomato paste. When the potato paste was once squeezed out and squeezing was stopped, the vessel restored the original shape. If the vessel was pressed again, the tomato paste was violently pushed out together with air sucked into the vessel when the vessel had restored the original shape, and smooth squeezing could not be performed. When the vessel was allowed to stand still for several days after the vessel had been used several times, the surface of the tomato paste was discolored because of oxidation. The largest restoring force of the vessel produced when the vessel was pressed and the pressing force was released was 350 g. The viscosity of the tomato paste was 32,000 cP.
Examples 2 through 7 and Comparative Examples 2 through 5
Vessels shown in Table 1 were packed with contents shown in Table 1, and they were tested in the same manner as described in Example 1. The obtained results are shown in Table 1.
In the column of "results" in Table 1, "good" means that the vessel did not restore the original shape for more than 30 seconds after squeezing of the content and "bad" indicates that the vessel restored the original shape within 30 seconds after squeezing of the content and the content and air were sucked.
In Table 1, the restoring force '1 (g) of the vessel means the maximum value of the restoring force produced when the central portion of the vessel was pressed so that both the walls adhered to each other and the pressing force was released, which was measured by a Tensilon tester, and the viscosity (cP) indicates the value measured by a Brookfield viscometer at the temperature where the vessel was actually used.
Table 1
Vessel Shape of Sectional Sectional
Orifice Area (mm) Area (mm) of Orifice of Residence
Portion
Example 2 200 cc, circular, low hexagonal 11 36 density polyethylene alone
Example 3 300 cc, laminate of low density circular 25 64 polyethylene including vinylidene chloride resin layer
Example 4 400 cc, tubular vessel of rhombic 8 48 polyvinyl chloride
Example 5 1 kg, flat, low density circular 24 64 polyethylene alone
Example 6 500 cc, laminate of low star-shaped 4 18 density polyethylene including Eval layer
Example 7 500 cc, thin laminate of low ditto 2.5 10 density polyethylene including Eval layer
Comparative 200 cc, circular, low density hexagonal 11 36
Example 2 polyethylene alone
Comparative 200 cc, circular, polypro- ditto 24 36
Example 3 pylene alone
Comparative 300 cc, laminate of low density star- 4 18
Example 4 polyethylene including Eval layer shaped
Comparative ditto circular 36 75
Example 5 Table 1 (continued)
Length (mm) Restoring *1 Content Viscosity*2 Results of Opening of Force (g) (cP) of Content
Residence of Vessel at Time of Use
Portion
Example 2 6 60 shos cream 56000 good
Example 3 10 90 peanut butter 87000 good
Example 4 5 90 cream for cake 28000 good
Example 5 20 120 printing ink 156000 good
Example 6 8 62 chocolate 15600 good
Example 7 10 40 mayonnaise 8200 good
Comparative 6 60 creamy soap 5600 bad
Example 2
Comparative 10 160 shoe cream 54000 bad
Example 3
Comparative 8 62 mayonnaise 7200 bad
Example 4
Comparative 20 62 ketch-up 4700 bad
Example 5
Claims (3)
1. A squeeze package comprising a flexible plastic hollow vessel and a viscous content packed in the vessel, wherein the hollow vessel comprises a flexible cylindrical barrel, a narrowed orifice passage connected to the barrel through a shoulder and a residence portion connected to the orifice passage through a stepped portion and having a squeeze opening on the top end thereof, the content has a viscosity of 1,000 to 250,000 cP, and the dimension of the vessel and the viscosity of the content are within the ranqe satisfying the requirements represented by the following formulae: : log # # -log l-log S1/S0 K + 5.45, log # # 0.588 log S0 + 0.764 log E + 2.30, and Si/So ~ 2 wherein # stands for the viscosity (cP) of the content, So stands for the sectional area (mm2) of the orifice passage, s1 stands for the sectional area (mm2) of the residence portion, e stands for the length of the residence portion in the axial direction and E stands for the elastic recovery (g) of the cylindrical barrel in the non-packed state.
2. A squeeze package as set forth in claim 1, wherein the viscosity of the content is 5,000 to 150,000 cP.
3. A squeeze package as set forth in claim 1, wherein the Si/So ratio is in the range of from 3 to 10.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8413477A GB2159116B (en) | 1984-05-25 | 1984-05-25 | Squeeze package |
| SE8402934A SE449084B (en) | 1984-05-25 | 1984-05-30 | KLEMFORPACKNING |
| AU29019/84A AU567346B2 (en) | 1984-05-25 | 1984-06-04 | Squeeze package |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8413477A GB2159116B (en) | 1984-05-25 | 1984-05-25 | Squeeze package |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8413477D0 GB8413477D0 (en) | 1984-07-04 |
| GB2159116A true GB2159116A (en) | 1985-11-27 |
| GB2159116B GB2159116B (en) | 1988-09-01 |
Family
ID=10561530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8413477A Expired GB2159116B (en) | 1984-05-25 | 1984-05-25 | Squeeze package |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU567346B2 (en) |
| GB (1) | GB2159116B (en) |
| SE (1) | SE449084B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0495357A1 (en) * | 1991-01-12 | 1992-07-22 | Colgate-Palmolive Company | Tube with rectangular cross-section |
| JP2015143130A (en) * | 2013-12-24 | 2015-08-06 | キョーラク株式会社 | Viscous object storage container |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB936867A (en) * | 1961-04-29 | 1963-09-18 | Gunnar Nimrod Pettersen | Dispenser for drop-wise discharge of liquids |
| GB1024972A (en) * | 1961-09-15 | 1966-04-06 | Unilever Ltd | Resiliently deformable containers |
-
1984
- 1984-05-25 GB GB8413477A patent/GB2159116B/en not_active Expired
- 1984-05-30 SE SE8402934A patent/SE449084B/en not_active IP Right Cessation
- 1984-06-04 AU AU29019/84A patent/AU567346B2/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB936867A (en) * | 1961-04-29 | 1963-09-18 | Gunnar Nimrod Pettersen | Dispenser for drop-wise discharge of liquids |
| GB1024972A (en) * | 1961-09-15 | 1966-04-06 | Unilever Ltd | Resiliently deformable containers |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0495357A1 (en) * | 1991-01-12 | 1992-07-22 | Colgate-Palmolive Company | Tube with rectangular cross-section |
| GR920100006A (en) * | 1991-01-12 | 1992-12-30 | Colgate Palmolive Co | |
| AU642065B2 (en) * | 1991-01-12 | 1993-10-07 | Colgate-Palmolive Company, The | Tube with a rectangular cross-section |
| US5383577A (en) * | 1991-01-12 | 1995-01-24 | Colgate-Palmolive Company | Plastic tube produced by blow molding |
| TR26701A (en) * | 1991-01-12 | 1995-05-15 | Colgate Palmolive Co | PLASTIC TUBE PRODUCED BY BLOWING MOLDING |
| JP2015143130A (en) * | 2013-12-24 | 2015-08-06 | キョーラク株式会社 | Viscous object storage container |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2159116B (en) | 1988-09-01 |
| AU567346B2 (en) | 1987-11-19 |
| SE449084B (en) | 1987-04-06 |
| AU2901984A (en) | 1985-12-12 |
| SE8402934D0 (en) | 1984-05-30 |
| GB8413477D0 (en) | 1984-07-04 |
| SE8402934L (en) | 1985-12-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960525 |