CZ200697A3 - Package and a blowing mould for making the same - Google Patents

Abstract

A container for drinks comprises a transparent bottom portion (2) and a body (3), which is extended from the bottom portion (2) and at the top passes into an opening. The bottom portion (2) has a first wall portion (7) which curves to the interior of the container and which is formed coaxially with the longitudinal centre axis (8) of the container and whose outer circumference substantially coincides with the outer circumference of the bottom portion (2). Moreover, the bottom portion (2) has a second wall portion (9), which curves to the interior of the container and which is formed within and coaxially with said first wall portion (7). The wall of the bottom portion (2) is formed such that a ray (S1, S2, S3), which at an angle of incidence ( alpha ) falls on the outside of the bottom portion (2) at an arbitrary point (a) and which leaves the inside of the bottom portion (2) at a point (b), satisfies the following condition: <MATH> wherein gamma is the increase in inclination between the wall surface of the bottom portion (2) at the point (a) and the wall surface of the bottom portion (2) at the point (b), θc is the critical angle for total reflection at the point (b) and nD is the refractive index of the bottom portion (2) at the point (b). A blowing mould for producing such a container has surfaces for forming the wall portions (7, 9) which are curved to the interior of the container (1). <IMAGE>

Description

The present invention relates to a container, in particular a container for a beverage, of the type as set forth in claim 1.

Furthermore, the present invention also relates to a blow mold for making this container.

BACKGROUND OF THE INVENTION

The present invention is particularly intended to produce blown bottles of plastic material that are refillable and used to pack fizzy soft drinks, but this need not be the sole and exclusive use of the invention. Examples of such bottles are described, for example, in patent applications EP-A-0 521 841 and EPA-0 247 566. Thus, this type of bottles is manufactured from a preform that is heated to a higher temperature and compressed to the final shape by air pressure.

Refillable packagings of the above type must be inspected and inspected for any impurities or mechanical damage (cracks), especially at the bottom of the bottle, after each filling operation. Equipment for such inspections is described in patent application EP-A-0 647 846, which discloses a method for inspecting a transparent container having a base which is concave inwardly of the container. For this method, is

Both ϊ. ν.Γΰί S1OI and mez.i PTL »These tíCt Cl · Γ .imy ZCIl Oio *» '· ^1, which is formed by a digital <a?.: er ·? · .. ·, sk zvsn ·· · . <.

A light source illuminates the srod -?!: Ob ·;?!, H in oros touoeri by a light cove and part of the light ietektor,, Οΐι'ί'ύ; i. o c ·

- ¹ I. 3 k CO propelled through the envelope is detected by the detector, light ^-; as an image. Defects at the bottom of the cracks, or dirt ra spo -den i eye for example zbvtkv kaoaiinv n?

de t e k to>

just ;

the darker one that registers the 1 envelope, such as the inner envelope of the envelope, or the particles, diverting the amount of the world ?, falls outside. · / vc retina raster ec-o

C Li ZI I '7 v.

rú'i VTil 7f processed on a computer that is associated with the camera, which is damaged or dirt, j; In view of the above, the threshold value relative to the level of opacity is determined, this orsh value being selected such that the packaging is considered to be defective and incapable of further use if the light intensity in the gift region of the image is less than this threshold. If the light intensity over the whole or a selected part of it is greater than the threshold, the packaging is considered acceptable for further refilling.

After each filling operation, the containers of the aforementioned type must be washed, as is usually done in an aqueous solution and at a temperature of about 58 ° C to 60 ° C. The higher the temperature used, the better the washing results. However, in this case, the plastic material of the packaging has some limitations, yet requirements of 75 ° C appear on the market.

and the temperature of the washing solution up to

Modern technologies EP-A-0 442 836, EP-A-0 (see for example patent applications and WO-A-030/18005) allow

571 262 c-iotLi at r,

at the bottom.

As examples of prior art may be mentioned

Podstat ?; The invention is an object

Taking into account all of the foregoing, the present invention provides a package that can withstand temperatures up to

the bottom, ie at the bottom.

According to the present invention, the above object, and still other objects, which will become more apparent from the following specifications, are accomplished by means of a package consisting of a transparent bottom and a body that extends from the bottom and passes at the apex into the aperture opposite the bottom. has a first wall portion that is curved inwardly of the container and which is formed coaxially with the longitudinal centerline of the container, and its outer periphery coincides with the outer periphery of the bottom, and wherein the bottom further has a second wall portion that is curved inwardly inside the package and which is formed within the aforesaid first wall portion and coaxially with the first wall portion, and further that the bottom wall is formed;

Even at any point λ that leaves the interior

So, the following condition is dirty:

Θ- - arcsinfsin a / n _D J, 0 <a <90 where γ is the gradient of inclination between the surface angle for critics' point (b), t h total reflection at point (b) and _D is the refractive index of the bottom at point (b) .

Furthermore, this object is achieved by the boundary of a blow mold for the production of a package consisting of a first projecting portion, a grid. The surface of the floor urun o r v n v v;

and 3 i <.

t e nv y t 'rena care:

eminenc

The portions of the wall of the container bottom and coaxially with the said portions are adapted to form a second portion of the wall of the container bottom.

described in further preferred embodiments of the invention as claimed.

Due to the changed shape of the bottom of the package, preferably by means of two inwardly directed and coaxially curved portions, the bottom of the package gains improved strength compared to constructions according to prior technologies. The internal pressure that can prevail within the package, such as when the package is filled with non-alcoholic beverages carbonated with a CCy gas, is compensated by the modified gains in the transition between the curved portions.

It has been found that the above construction of the bottom of the package with a second curvature of the wall portion towards the inside of the package can sometimes cause problems when the bottom of the package is irradiated during inspection. More precisely, the dark circles that result from the curvature of a portion of the wall cannot be effectively encased in the region of the second layer of dirt on the bottom of the invention at this bottom of the invention.

in the case of a thinner, the accumulation of dried liquid. Moreover, in the region of these dark rings, it is impossible to demonstrate defects in the bottom material of the casing, such as an orascine.

However, this problem has also been eliminated by the invention as defined in claim 1.

List of pictures in the drawing ·

The present invention will now described and ob j asn ".F; 3 OÓkcíZGni η <»connected senemacieke iia,; re: sy where he is 1 ^{1 T r} _r ~ ~~ Současné at present preferred time vynalezu. Fig. 1 is a schematic side view of n and arrangement Controls of packaging technology in execution according to previous technologi i. Fig. 2 is a sectional view on the bottom part invented packaging. Fig. 1a is a sectional view, which corresponds to i : r.2 and on

packaging which is not according to the present invention.

Fig. 3b is a cross-sectional view corresponding to Fig. 2 of another container not according to the present invention.

Giant. 4 is a plot of the area as permitted by the present invention to increase the inclination γ relative to the incidence angle α.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows an exemplary embodiment of a control technology for any container 1, which container is shown in cross-section, mainly for reasons of clarity. Cover. It has a transparent bottom 2, and a body 3 that extends from bottom 2 and passes into aperture 4. As mentioned above, the present invention is particularly intended to be a container for feeding and to be pinned: for example, it can be re-opened. - Fill: as there is a bottle of thermoplastic material, designed for oro-carbonated beverages. A container that illuminates the bottom positioned between a light source 5, e.g. a container 1 and an aetector, an electronic camera that registers light passing through the bottom 2. The container bottom 2 is preferably illuminated only for a brief moment and generates a light through the container bottom 2. like this, world], the drug is registered by the detector regarding the method of control: flash. The light rays passing through the 11 and impinging on the detector (j are called azu. Rais:

details, nčtjiL vc vvjc mentioned _to -3.l Ζ3Λ. ¹ - 11 of the wall reversal of the EP-A ^- '.. ο · ί / 84 <? included.

Fig. 2 is a cross-sectional view of a bottom portion of a container constructed in accordance with the present invention. The bottom 2 of the casing 7 has a first wall portion 7, the so-called dome, which is curved inside the casing 1. The dome 7 is formed coaxially with the longitudinal centerline of the casing 7, and the outer perimeter of the dome 7 substantially coincides with the outer perimeter of the bottom 2. it has a second dome 9 which is curved inwardly of the container 1 and which is formed coaxially with the first dome 7, and also within the first dome 7.

Fig. 2 shows how three substantially parallel beams of light 51, S2 and S3, which impinge on the outside of the bottom 2, pass through the material of the bottom 2 and leave it on the inside of the bottom 2. The designation used herein will be explained below in connection with the beam 51 in FIG. The beam S1 impinges on the outside of the bottom 2 at a point and at an angle of incidence α, relative to the normal of the wall surface guided by this point. This beam wraps according to the fracture law, which looks like this:

·. ·. (X = y

3 η β, where y 35 the refractive index of the air on the outside of cbal 1, rig is the refractive index of the packaging material at point a, and β is the refractive angle relative to the wall surface at a.

This beam S1 penetrates inside the material and impinges on the base layer towards the interior of the container 1 at point b, o from the angle of incidence Θ where it breaks according to the law of refraction. If the surfaces of the walls of the bottom 2 are parallel at points a and b, the β and θ will be identical and therefore the beam will also leave the inner side of the bottom 2 parallel to the dor-adaileim caprak of light. If s-a this in fact .; therefore, if the light angle a reaches a greater slope at point b compared to the point d at the dc point a, the angle θ will be greater than the angle β. By "greater inclination at the surface" is meant a surface that is growling parallel to the central axis δ.

Practical experiments have demonstrated that when the bottom 2 of container 1 is constructed, this "increased slope γ" must be taken into account. If the slope is too great, the angle of incidence θ at point b actually exceeds the critical angle for total reflection G _c :

G _c = aresin (ηχ / η _Β ) whereupon the incident light undergoes total reflection and therefore does not reach the detector. This case is illustrated in Fig. 3a, which shows a package that is not constructed according to the invention. The beam S1 ^f approaches the too steep portion of the bottom 2 of the container 1 and therefore undergoes such a large increase in the slope γ between k 'l.

the surface of the honor of days 2 at point b is sintered at this point b, and

17ό: Lil Π p £ p ta O ta ta ta 17 17 17 ned From 1732, do not reach detector 6, which re-registers dark orstencovirus spots in the second one! Construct kc exterior of bottom oy o.

In addition, FIG. 2, in the region of the second dome 9 substantially parallel to the central axis 8 of the package 7. This results in that only a fraction of the incident beam S1 'is wrapped by measuring into the material in this steep area, while the major part of the radiated beams will be reflected towards the outer early because of the reflectance of the surface j <

: o for jjcíí Oj. i z pie dated equal to .i r i v u u η 1 u., 9 c). This contributes r ·. Since the detector b registers the dark annular spots in the region of the second dome 9 according to the preferred embodiment, the outer side of the bottom 2 is therefore formed with a slope which over the entire surface of the bottom 2 exceeds about 10 relative to the central axis 8.

In order to prevent total reflection when irradiating the bottom 2 of the package! light, he must. the following condition must be met:

γ <0 _C - arcsine (sine a / n _D }, 0 <a <90 °

In Fig. 4, this relationship is drawn for a packaging JL made of polyethylene terephthalate (PET) having a refractive index of 1.576. The above condition is complied with in the area indicated by dashed lines.

Fig. 3b shows another embodiment of an example packaging not constructed according to the present invention. In this case, the wall thickness of the bottom 2 is increased in the direction of the central axis 8 and therefore the incident beam S1 '' undergoes such an increase in the inclination γ between points a and b that the total reflection occurs at point b.

an area which and which may not have the material in it, even so the detector can not be distinguished from impurities on the bottom surface when visualizing defects in the actual:

Certain experts in the field will find that there are many conceivable modifications to this invention:

within the scope of the appended claims. For example, the bottom 2 of the container 1 may have a plurality of coaxial inwardly curved portions. Possible thermoplastic materials for the production of the containers according to the invention are, for example, PEN, also polyethylene, polypropylene blends of various terephthalate (PET), polyethylene terephthalate, or polyamide (IV). Of course, of plastic materials, the present invention may not be associated with a single method of irradiating the bottom of the package. The most important thing is that defects and / or impurities can be visualized by such radiation, preferably as dark parts. The control method may use either direct irradiation or diffuse irradiation.

The invention also relates to a blow mold (not shown) intended to produce a package of the aforementioned type. This blow mold consists of a first curved portion for forming the first dome 7 (of FIG. 2) and a second curved portion that is formed inside and at the same time coaxially with the first curved portion and which is adapted to form the second dome 9. According to a preferred embodiment According to the invention, the outside of the blow mold is inclined relative to the central axis of the blow mold.

Claims (2)

1. Packaging, in particular for beverages, consisting of a transparent bottom (2) and a body (3) which is stretched. (2) and at the apex passes into an opening (4) opposite to bottom (2), said bottom (2) having a first wall portion (P) which is curved inwardly of the package and which is formed coaxially with the longitudinal centerline ('?) the container, and its outer water is equal to the circumference of the bottom (2), shading at the bottom of it; the second is arcuated by a diameter of about 00, and with an exterior formed within the aforementioned first wall part (1), coincident with said first wall part (7), and also by the bottom wall (2) being formed such that for a beam (S1, S2 and 53) which Aer ¹ 'the opposite side of the bottom (2) at any point (a) and which leaves the interior of the bottom (2) at point (b), is the following condition is met: γ <θ, _ · - arcsi.nl Sin. a / n _D }, 0 <a Kde C 'U where γ is the gradient of inclination between the bottom wall surface (2) at (a) and the bottom wall surface (2) at (b), 0 _C is the critical angle for total reflection at (b) and r. _D is the refractive index of the bottom (2) at (b). Packaging according to claim 1, characterized in that the outer side of the bottom (2) is inclined relative to the central axis 10 of the packaging. Packaging according to claim 2, characterized in that the inclination of the outer side of the bottom (2) relative to the central axis (8) is greater than about 10 °. or 3., ie again 4. Packaging according to i. c i stretchable. .5. The packaging of 11 '' is characterized by the fact that it is blown in a bottle made of thermoplastic material. Packaging according to claim 5, characterized in that the thermoplastic polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polypropylene (PP) or polyamide (PA), or is a mixture of the above materials. ^r i * y χuko »d ^ x norm for. The blow mold comprises a first protruding portion intended to form the bottom portion (7) of the bottom of the pack, characterized by: θ has a second protruding portion which is formed inside said first wall portion (7) of the container bottom and coaxially with said part (7 of the second wall portion (9) of the container bottom). Blow mold characterized by and. wherein the material is and is adapted to be molded according to claim 7, wherein the outside of the blow mold is inclined with respect to the center of the blow mold.