RU2449943C2 - Method of filling shrinkable container - Google Patents

Abstract

FIELD: transport, distribution of fluids.

SUBSTANCE: set of inventions relates to method of dispensing fluid into shrinkable container and container made from biaxially-oriented PET to be filled with hot fluid. Proposed method comprises the following stages: filling said container with high-temperature fluid, cooling container walls in filling, sealing filled container, cooling container walls in sealing, shrinking said container after sealing, and cooling container walls after shrinkage.

EFFECT: controlled shrinkage.

6 cl, 14 dwg

Description

FIELD OF TECHNOLOGY

The present invention relates to a method for pouring a liquid product into a seated container. In particular, the invention relates to pouring a product having a high temperature into a polymer container that shrinks under the influence of high temperature. In particular, the method is used to pour a product having a temperature of more than 60 ° C into a PET bottle that has not undergone heat setting.

BACKGROUND OF THE INVENTION

Bottles of polyethylene terephthalate (PET) have numerous fields of application due to their excellent characteristics: resistance, lightness, transparency, organoleptic properties. These bottles are manufactured at high speed by biaxial drawing of a preform in a mold.

However, although these bottles have numerous advantages, their disadvantage is deformation at temperatures above 60 ° C. Pouring a product having a high temperature (85 ° C) into these bottles causes deformations that render the bottles unusable. In the prior art, several methods are described to eliminate this drawback and to ensure hot filling of PET bottles.

The most effective way to increase the high temperature resistance of biaxially oriented PET bottles is considered to be heat setting. The principle of this method, widely distributed on the market, is to heat the walls of the bottle to increase the degree of crystallization and, thus, increase molecular stability at high temperature. This principle is applied with several heat setting methods and devices described in the prior art. A significant advantage of the heat-fixing methods is the absence of the need to modify the bottling methods, moreover, the heat-setting of the bottle is carried out in the manufacture of the bottle.

However, heat-treated bottles that allow liquid to be poured at high temperatures have several drawbacks.

The first drawback is that only special quality polyethylene terephthalates can be used. Such polyethylene terephthalates are more difficult to manufacture, and they add to the cost of the container.

The second disadvantage is associated with a decrease in the production rate of bottles, since the heat-setting method slows down the inflation cycle.

The third drawback is related to the weight of the bottles. Filling the bottle with hot liquid after cooling leads to the creation of negative pressure inside the bottle; negative pressure creates a risky deformation of the bottle walls. The most well-known method of counteracting negative pressure in a bottle is to add compensation inserts that allow controlled deformation of the bottle. However, bottles containing compensation inserts are stiffer and therefore heavier. The result is an excess of material that is not necessary for the good preservation of the product. In addition, compensation inserts spoil the appearance of the container, which makes it less attractive to the consumer.

Patent applications WO 2004/106175 and WO 2005/002982 offer the concept of a deformable bottle bottom that eliminates the use of side compensation inserts.

Patent application FR 2432991 provides a method for filling PET bottles, which eliminates the use of heat-cured bottles. This method consists in cooling the outer walls of the bottle to avoid any deformation of the bottle during the spill cycle. In accordance with this method, the cooling of the outer walls of the bottle can be interrupted when the need to eliminate deformation of the bottle disappears. The specified method allows to exclude deformation of the bottle when filling. However, this method does not allow to abandon the compensation inserts designed to counter the negative pressure in the bottle after cooling.

US Pat. No. 5,251,424 also proposes a method for bottling PET bottles, eliminating the use of heat-cured bottles. This method consists in filling the bottle with a liquid having a high temperature, and in adding a dose of liquid nitrogen before sealing. Evaporation of nitrogen creates pressure in the bottle, which prevents its shrinkage. In addition, this method eliminates lateral compensation inserts, since nitrogen maintains sufficient pressure in the bottle to compensate for changes in liquid volume. Theoretically, the method described in US patent 5251424 should allow the use of conventional PET bottles, as well as reduce their cost. However, this method is very difficult to put into practice. Excessive pressure created immediately after sealing a bottle whose walls are hot, leads to immediate and undesirable deformation of the container.

To address the disadvantages of US Pat. No. 5,251,424, US Pat. No. 6,503,369 offers a similar method, but with filling the bottle in the mold cavity. This method consists in placing the bottle in the mold cavity, filling the bottle with liquid having a high temperature, and adding a dose of liquid nitrogen before sealing. Evaporation of nitrogen creates pressure on the wall of the container at the wall of the cooled mold. This method allows you to get ordinary bottles filled at high temperature, however, the application of this method is complicated by the complexity of the filling machine, which consists in filling each of the bottles in the mold cavity.

All methods proposed in the prior art have the general principle of eliminating shrinkage of the container under the influence of temperature. Thus, the volume of the container before and after the spill remains unchanged.

SUMMARY OF THE INVENTION

In contrast to the methods proposed in the prior art, the principle of the present invention is to use the shrink properties of the container at the stage of filling and, therefore, leads to a change in the volume of the container. In accordance with the present invention, the volume of a filled container after a spill is reduced.

The method in accordance with the present invention consists in the controlled application of the shrink properties of the containers when they are filled at high temperature (usually 85 ° C for PET bottles). This method is preferable because it allows, on the one hand, the use of containers that have not undergone preliminary heat treatment, and, on the other hand, to eliminate or limit the creation of negative relative pressure in the package after cooling.

The subject of the present invention, in particular, is the method described in the claims.

The invention also relates to the device and capacity described in the claims.

The method in accordance with the present invention allows filling containers seated under the influence of a high temperature of the spill of the product. These polymer containers have a molecular orientation that ensures their shrinkage under the influence of high temperature. The present invention is particularly applicable for filling biaxially oriented PET containers, such as bottles. The invention is also applicable for filling at high temperature polymer containers made of films, and these films shrink under the influence of high temperature.

The method in accordance with the present invention also allows you to create a positive relative pressure inside the seated container. The invention relates to shrinkage of a filled and hermetically sealed container by heating the container wall. The method in accordance with the present invention improves the grip and resistance to vertical compression of containers with thin walls.

BRIEF DESCRIPTION OF GRAPHIC MATERIALS

The accompanying drawings will better understand the present invention.

Figures 1-11 show a first embodiment of the present invention.

1 and 2, the basic concept of the first embodiment of the present invention is presented.

Figure 1 shows the container immediately after filling and sealing, and the product inside the container has a high temperature.

Figure 2 presents the container at the end of the spill of the product. Container volume decreased as a result of container shrinkage.

Figure 3-8 presents the various steps of the method.

Figure 3 presents the container before filling.

Figure 4 shows the filling of the container with a product having a high temperature.

Figure 5 shows the hermetic sealing of the container.

Figure 6 presents the shrinkage of the container, and the product has a high temperature. The pressure inside the container compresses the volume of gas in the space of the upper part.

Figure 7 shows the cooling of the container and the return of the product to ambient temperature.

On Fig presents a container cooled to ambient temperature. The increase in gas volume in the upper space compensates for the thermal contraction of the product.

Figure 9 shows the local cooling of the container during the spill process.

10 and 11 show the hot filling of a container made of a film shrinkable under high temperature.

Figure 10 presents the container immediately after filling with a product having a high temperature, and tight sealing.

11 shows the geometry of a compressed container.

12 and 13 show a second embodiment of the present invention, which consists in creating overpressure in a seated container at high temperature and filling at low temperature.

On Fig presents heating, allowing you to create local shrinkage of the walls of the container and, thus, create pressure in the container.

On Fig presents a container, the volume of which after shrinkage is less than the original volume.

DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION

The present invention relates to the use of the shrink properties of a container when it is heated to a high temperature. In the context of the present invention, “high temperature” is understood to mean a temperature allowing initiating shrinkage of the container; and, conversely, “low temperature” should be understood as the temperature below the shrink temperature.

The shrinkage properties of the container are largely dependent on the manufacturing methods and, in particular, on the molecular orientation caused by the manufacturing. For example, a container, such as a PET bottle made by double-drawing a preform in a mold, shrinks significantly when it is heated to a high temperature. Other containers, such as containers made of film, may also have similar shrink properties.

According to a first embodiment of the present invention, container shrinkage is applied when spilling a product having a high temperature, the product heating the container walls and causing shrinkage. A key aspect of the present invention is the controlled use of container shrinkage to limit deformations and eliminate, at least in part, the negative relative pressure typically created in the container after cooling.

The basic principle of the invention is presented in figures 1 and 2.

Figure 1 shows the initial geometry of the container 1, containing the neck 4, the cylindrical body 5 and the bottom 6. The walls of the container significantly shrink when it is heated to a high temperature. Figure 1 shows the container 1, filled with a product 9 having a high temperature, and hermetically sealed with a lid 8. Also, the space of the upper part of the container is filled with gas 10, and this gas may be air. The filling level 11, which determines the relative volume of the product having a high temperature, and the gas inside the container at the time of its sealing, is precisely determined. It is generally preferable to prevent shrinkage of the container before sealing the container tightly. That is why with fast shrinkage of the container, it may be preferable to use means that block shrinkage before tight sealing.

Figure 2 presents the container 1 and its contents after cooling to ambient temperature. The container sat down when spilling a product having a high temperature. The change in container volume is schematically represented by the change in height 3 of the container. A change in volume may be due to a change in height, diameter, or geometry. In any case, a change in volume is created as a result of the shrinkage of the container walls. Some parts of the container are not seated, for example, such as the neck 4, which together with the lid ensures tightness. Figure 2 also shows the volume of the product 9 inside the container; the volume decreased as a result of compression of the product 9 upon cooling to ambient temperature. In accordance with the present invention, the shrinkage of the walls of the container after hermetic sealing allows at least partially to compensate for the compression of the product during cooling. Shrinkage of the container is often preferred, sufficient to create a relative pressure inside the package greater than or equal to zero when the product has an ambient temperature. Thus, the use of containers with expansion joints is no longer required.

Figure 3-8 shows the filling of PET containers and each of the steps of the method.

Figure 3 shows a PET container 1 containing a neck 4, side walls 5 and a bottom 6. The walls of the container have a significant molecular orientation (i.e., are highly oriented), so that the walls shrink at a high temperature. If we are talking about a PET container made by biaxial drawing, the high temperature corresponding to the temperature at which the molecular mobility becomes sufficient to ensure shrinkage is higher than 60 ° C. Typically, hot filling temperatures are at least 85 ° C to ensure sufficient storage properties. At such temperatures, strong and rapid shrinkage of the walls of the PET container occurs.

Figure 4 shows the filling product 9 having a high temperature container 1, sitting at a high temperature. Typically, cooling the outer walls of the container 1 is necessary to avoid shrinkage of the container during filling. The means 7 cool the outer wall of the container at the neck 4, the side walls 5 and the bottom 6. In some cases, partial cooling of the walls of the container is sufficient. By way of example, cooling the outer wall of a bottle can be accomplished using a liquid having a low temperature applied to a container. Filling is carried out quickly to prevent shrinkage of the container under the influence of temperature. The container 1 is not completely filled with product 9 in order to leave a sufficient volume of gas in the space of the upper part. Usually this gas is air, but in some cases it is preferable to use special gases such as nitrogen or carbon dioxide. The addition of special gases to the space of the upper part is usually carried out immediately after filling and before hermetically sealing the container.

Figure 5 presents the hermetic sealing of the container 1 after filling with the product 9 having a high temperature. The fill level 11 at the time of hermetic sealing determines the fill factor, i.e. the ratio of product 9 and gas 10 in the container. The fill factor plays an important role in the present invention, since it determines the residual pressure in the container after cooling. This aspect will become more clear after a complete description of the various steps of the method. In the hermetic sealing step of the container of FIG. 5, it is often preferable to continue cooling the outer wall of the container. The sealing operation consists in placing the lid 8 on the neck 4 for hermetically sealing the container 1. At the time of sealing, the relative pressure inside the container is zero. Cooling means 7 avoids too much increase in temperature of the container and its shrinkage. The sealing step shown in FIG. 5 is carried out quickly in accordance with known methods. As an example, sealing can be done with a lid or by welding.

Figure 6 presents a key step in the spill method, in which the container undergoes controlled shrinkage. At this stage, the walls of the container shrink under the influence of temperature and reduce the volume of the container. This leads to an increase in pressure in a hermetically sealed container. As a result of this rapid increase in pressure, the volume of gas inside the container is compressed.

The container shrinkage step of FIG. 6 is initiated when the product is still hot enough to create shrinkage. Shrinkage usually occurs immediately after sealing, when the temperature of the product is still high enough. If the product temperature is too high, it is advisable to cool the product and container to an acceptable shrink temperature. In fact, too high a shrink temperature leads to undesirable deformation of the container. For example, when filling a PET container at 100 ° C, shrinkage may be preferred at 80 ° C. Thus, it is necessary to cool the product and container to 80 ° C before performing shrinkage.

Shrinkage is initiated at a temperature high enough to create pressure inside the container and low enough to prevent undesired deformation of the container. For PET containers, this temperature is usually between 65 and 100 ° C; however, the preferred shrink temperature is from 75 to 90 ° C.

Typically, shrinkage of the container is slight and difficult to see with the naked eye. Shrinkage depends on the container, fill factor, temperature and shrinkage time. The shrinkage coefficient directly affects the residual pressure, i.e. relative pressure in the container after cooling. Typically, the compression of a liquid product spilled at high temperature is about 2 to 5% upon cooling. For example, the volume of water when cooling from 85 to 20 ° C is reduced by approximately 3%. The decrease in volume depends on changes in temperature, as well as on the properties of the product. Theoretically, the shrinkage of the container is equal to the change in volume caused by zero residual pressure. If the shrinkage of the container is greater than the change in product volume, the residual pressure is positive; and vice versa, if the shrinkage of the container is less than the change in the volume of the product, the residual pressure is negative. In practice, the temperature of the gas when the container is sealed can affect the residual pressure. It is preferable to compress the gas at a low temperature at the time of tight sealing of the container.

The geometry of the container has a direct effect on reducing the volume of the container. It has been observed that a container of small volume and large thickness is preferred to create increased shrinkage pressure.

Container manufacturing conditions also have a great effect on shrinkage. For PET containers, it was noted that the low temperature of the biaxial hood allows containers to shrink significantly under the influence of temperature. In contrast, the high temperature of the biaxial hood allows for weaker shrink forces. The temperature of the hood allows you to optimize the strength and speed of shrinkage of the container.

The fill factor, determined by the ratio of the volume of the product to the volume of the container at the time of hermetic sealing, affects the shrinkage of the container. If the fill factor is too high, the container shrinks slightly, and this creates a negative residual pressure in the container. In contrast, if the fill factor is too low, the container shrinks significantly, and this leads to undesirable deformation of the container. The fill factor should be adjusted according to the desired residual pressure. Typically, the fill factor is selected from 85 to 98%, preferably from 90 to 96%.

Figure 6 presents the shrinkage mechanism. Under the influence of the high temperature of the product 9, the container shrinks and compresses the volume of gas 10 located in the space of the upper part. Gas compression is indicated by a change in fill level 11. The container shrink rate is usually quite large and depends on the shrink temperature. Preferably, the shrink time is less than 5 minutes and more preferably less than 3 minutes. Shrinkage is initiated when the product is still at a high temperature.

Figure 7 presents the step of cooling the container and its contents to ambient temperature. Means 7 cool the outer wall of the container. For example, water is applied to the container for cooling, or the container may be immersed in a bath of cold water. Often, it is preferable to rapidly cool the container to a temperature of molecular stability of the container, i.e. to the temperature at which the container does not shrink. For a PET container obtained using a biaxial hood, this temperature is approximately 60 ° C. After reaching this temperature, the container can be cooled more slowly by natural convection with ambient air.

On Fig presents a container after cooling to ambient temperature. The chilled container is different from the container before filling, shown in figure 3; the volume of the container is reduced as a result of its shrinkage during the spill. According to a preferred embodiment of the present invention, the relative pressure inside the container is greater than or equal to zero. According to this preferred embodiment, the container does not contain compensation inserts; these inserts are useless since the pressure inside the container is positive or zero. The crystallization coefficient of the side walls of the container is less than 30% and usually ranges from 15 to 25%.

In the description of the invention, the container is always presented with the neck 4 facing up. Typically, the container is turned over after being sealed to sterilize the entire inner surface of the container. Turning the container over provides sterilization of the inner surface of the neck 4 and lid 8; when turned over, the inner surface comes into contact with a product having a high temperature. Sterilizing the container with the high temperature of the product allows you to kill the germs that may exist on the inner wall of the container and ensures optimal product safety. The sterilization of the container is preferably carried out in conjunction with the shrinkage of the container.

The present invention allows filling containers at high temperature with high accuracy and reproducibility. Reproducibility requires the use of equally made containers. For PET containers made with blown blanks, it is important, for example, to control the blowing temperature, which has a great influence on shrinkage properties. When bottling a product, it is important to handle all bottles equally. A method of manufacturing containers and filling them allows for high production stability.

The present invention allows PET containers to be filled at 100 ° C without heat setting. Spilling a product having a temperature of 100 ° C may require optimized cooling means during the filling and sealing stages of the container. In accordance with the present invention, the container can be filled and shrunk at 100 ° C; or the container can be filled at 100 ° C and shrink at a lower temperature, such as, for example, 85 ° C.

When the spill is carried out at a particularly high temperature, it may be preferable to use containers, only some parts of which are heat treated. It is preferable, for example, to use a PET container in which only the neck crystallizes in order to avoid shrinkage of this part of the container. Particularly preferably, the bottle has a neck whose crystallization coefficient is higher than the crystallization coefficient of the side walls.

The bottom of the container is designed in such a way that it resists both temperature and pressure, which are installed in the bottle during shrinkage. The bottom is petal and even with a low crystallization coefficient is especially adapted. A strongly elongated bottom whose geometry is close to that obtained by free blowing (bubble geometry) is also suitable for the filling method.

Generally, it may be preferable to provide containers having special shrink zones. These special zones of shrinkage can be created in the manufacture of the container, providing a higher molecular orientation in these zones of shrinkage. For blown PET containers, special shrink zones can be created by mutually controlling the coefficient and the drawing temperature. Low temperatures or high blow-off ratios increase shrinkage.

Figure 9 presents another method of obtaining special zones of shrinkage. This method consists in blocking the shrinkage of some areas of the container at the stage of shrinkage. Means 7 cool the bottom of the container and thus prevent shrinkage of this part of the container. The upper uncooled portion of the container shrinks.

The first embodiment of the present invention is particularly suitable for filling at high temperature biaxially oriented PET containers, such as bottles. The present invention eliminates the use of heat-treated bottles. The invention allows the use of bottles without compensation inserts, as well as filling at high temperatures reaching 100 ° C. The invention also allows the use of bottles with a thin wall, and the thickness of the thin wall is less than 0.3 mm Finally, the present invention allows to obtain bottles with low residual internal pressure, and this pressure is created as a result of shrinkage of the container during hot filling.

The present invention can be used to fill at high temperature a variety of containers that sit under the influence of high temperature. Containers made of films can be used. 10 and 11 show a spill of a liquid having a high temperature into a container made of a film.

Figure 10 presents the stage of hermetic sealing of the container. The container 1 contains a tubular body 5 connected to the neck 4 and the bottom 6, and the tubular body 5 is made of a film that shrinks under the influence of high temperature. A film containing one or more layers has a high molecular orientation to provide shrink properties. The film was not subjected to heat setting, destroying shrinkage properties. The connection of the film 5 with the ends 4 and 6 can be carried out by welding. Typically, the ends 4 and 6 are thicker than the tubular body 5, and can be made by molding. In accordance with a preferred embodiment of the present invention, the ends 4 and 6, forming respectively the neck and bottom of the container, do not shrink under the influence of high temperature. The container 1 is filled with a product 9 having a high temperature, and hermetically sealed with a lid 8. The volume of gas 10 is enclosed in the space of the upper part when hermetically sealed. As shown in FIG. 10, the outer wall of the container does not need to be cooled during hot filling and airtight sealing. Cooling may be necessary to limit or prevent shrinkage of the container before hermetic sealing.

Figure 11 shows the container 1, which has settled down after cooling the container and its contents to ambient temperature. Only the tubular body 5 shrinks under the influence of high temperatures. After cooling, the residual relative pressure in the container 1 is positive or zero. A slight overpressure in the container is preferred to improve the hand grip of the container and its resistance to vertical compression.

However, in some cases, the shrinkage of the container is not sufficient to compensate for changes in the volume of product contained in the container. This is especially true for large-volume bottles, for which the volume of gas enclosed in them is small in relation to the volume of the product; this also applies to bottles with very thin walls, which create low shrink forces; and finally, this applies to bottles having a high fill factor to minimize the amount of oxygen contained in the bottle. To avoid the negative pressure being established in the bottle as a result of the spill, it is proposed to add the stage of heating the bottle during the spill using an external heat source. The heating step allows you to activate shrinkage at the exact time or increase the amplitude of the shrinkage.

The first option is to at least partially heat the container immediately after filling and tight sealing. As a result of heating, the shrinkage of the container is enhanced and the gas contained in the space of the upper part is compressed. During cooling, the gas pressure decreases.

According to a second embodiment, the container is heated when the container and its contents are already starting to cool. Preferably, the container is heated when the average wall temperature is close to the glass transition temperature.

According to a third embodiment, the container is heated when cooling is completed. Heating provides shrinkage of the container walls and creates a positive or zero relative pressure inside the container.

Preferably, the side walls of the container are heated. It may be preferable to locally heat the walls of the container in a predetermined area called the shrink area.

Preferably, the heating is carried out quickly and at high temperature in order to limit reheating of the product contained in the container. Hot air blowing is preferred. Usually the bottle shrinks evenly around the axis of symmetry. The rotation of the bottle around the axis of symmetry during its passage in the furnace allows for uniform shrinkage. Another method is to use infrared lamps to shrink the walls of the container.

12 and 13 show a second embodiment of the method in accordance with the present invention, which consists in using shrink properties to create pressure in a container filled at a temperature below the shrink temperature. Creating pressure in the container after filling is particularly useful when the container contains walls of small thickness. A common way to create such pressure is to add gas, such as nitrogen, to the upper space after filling the container. Changing the state of the gas creates a slight overpressure that increases the resistance of the container and simplifies its use. The present invention allows to create excess pressure without adding special gas to the space of the upper part.

12 shows a container 1 filled with a product 9 having a low temperature, this low temperature being lower than the shrink temperature of the container. The lid 4 hermetically seals the container 1. The volume of air 10 is enclosed in the container and is in the zone of shrinkage of the container. The means 12 heat at least the shrink zone to slightly reduce the volume of the container and slightly compress the volume of air 10.

On Fig presents a shrunken container. A decrease in height of 3 serves to demonstrate a change in the volume of the container. The air volume 10 in the container has decreased, which means a slight compression of the air. The present invention is particularly preferred for creating pressure in PET containers, such as bottles.

The present invention, which involves applying the shrink properties of a container during a spill, requires a container concept that takes into account the shrinkage of the container during the spill. The container should be designed so that the final volume matches the desired volume. Typically, the shrinkage of the container is from 1 to 20%, preferably from 3 to 15%.

DESCRIPTION OF EMBODIMENTS OF THE INVENTION

Example 1

The bottle weighs 24 grams and has a petal bottom. The initial volume of the bottle is 543.2 ml. After filling at 90 ° C in accordance with the operating mode, which will be described below, the volume of the bottle becomes 508.7 ml. Thus, the shrinkage of the bottle during the filling process is 6.35%. After cooling, a slight positive relative pressure is established inside the bottle.

The bottle is filled in accordance with the following operating mode.

1. Placing an empty bottle

2. Rinse the bottle

3. Transferring the bottle to the loading post

4. Start cooling the outer wall of the bottle by spraying with water at a temperature of 15 ° C

but. Filling a bottle with water at 90 ° C

i. Duration of filling: 4 seconds

ii. Filling volume: 92% of the initial volume, or 499.7 ml

b. Seal transfer

i. Duration: 1 second

from. Sealed bottle sealing

i. Sealing Duration: 1 second

5. The end of cooling the outer wall of the bottle

6. Shrinkage of the bottle in a free atmosphere

i. Shrink and sterilization phase

ii. Ambient temperature: 20 ° C

iii. Duration: 3 minutes

7. Fast bottle cooling

i. Cool by spraying with water at 15 ° C until the container and its contents return to ambient temperature.

Example 2

The bottle weighs 37.4 grams and has a petal bottom. The initial volume of the bottle is 1064.2 ml. After filling at 88 ° C in accordance with the operating mode, which will be described below, the volume of the bottle is 1012.1 ml. Thus, the shrinkage of the bottle during the filling process is 4.9%. After cooling, a slight positive relative pressure is established inside the bottle.

The bottle is filled in accordance with the following operating mode.

1. Placing an empty bottle

2. Rinse the bottle

3. Transferring the bottle to the loading post

4. Start cooling the outer wall of the bottle by spraying with water having a temperature of 15 ° C

a. Filling a bottle with water at 88 ° C

i. Duration of filling: 8 seconds

ii. Filling volume: 92% of the initial volume, or 979.1 ml

b. Seal transfer

i. Duration: 1 second

c. Sealed bottle sealing

i. Sealing Duration: 1 second

5. The end of cooling the outer wall of the bottle

6. Shrinkage of the bottle in a free atmosphere

i. Shrink and sterilization phase

ii. Ambient temperature: 20 ° C

iii. Duration: 3 minutes

7. Fast bottle cooling

i. Cool by spraying with water at 20 ° C until the container and its contents return to ambient temperature.

Example 3

The bottle weighs 24 grams and has a petal bottom. The initial volume of the bottle is 543.2 ml. After filling at 95 ° C in accordance with the operating mode, which will be described below, the volume of the bottle is 489.5 ml. Thus, the shrinkage of the bottle during filling is 9.89%. After cooling, a slight positive relative pressure is established inside the bottle.

The bottle is filled in accordance with the following operating mode.

1. Placing an empty bottle

2. Rinse the bottle

3. Transferring the bottle to the loading post

4. Start cooling the outer wall of the bottle by spraying with water at a temperature of 5 ° C

a. Filling a bottle with water at 95 ° C

i. Duration of filling: 4 seconds

ii. Filling volume: 92% of the initial volume, or 499.7 ml

b. Seal transfer

i. Duration: 1 second

c. Sealed bottle sealing

i. Sealing Duration: 1 second

5. The end of cooling the outer wall of the bottle

6. Shrinkage of the bottle in a free atmosphere

i. Shrink and sterilization phase

ii. Ambient temperature: 20 ° C

iii. Duration: 3 minutes

7. Fast bottle cooling

i. Cool by spraying with water at 20 ° C until the container and its contents return to ambient temperature.

Example 4

The bottle weighs 46 grams and has a petal bottom. The initial volume of the bottle is 1556 ml. After filling at 88 ° C in accordance with the operating mode, which will be described below, the volume of the bottle is 1503.8 ml. Thus, the shrinkage of the bottle during the filling process is 3.4%. After cooling, a slight positive relative pressure is established inside the bottle.

The bottle is filled in accordance with the following operating mode.

1. Placing an empty bottle

2. Rinse the bottle

3. Transferring the bottle to the loading post

4. Start cooling the outer wall of the bottle by spraying with water at a temperature of 5 ° C

a. Filling a bottle with water at 88 ° C

i. Duration of filling: 6 seconds

ii. Filling volume: 92% of the initial volume, or 1431.5 ml

b. Seal transfer

i. Duration: 1 second

c. Sealed bottle sealing

i. Sealing Duration: 1 second

5. The end of cooling the outer wall of the bottle

6. Shrinkage of the bottle in a free atmosphere

i. Shrink and sterilization phase

ii. Ambient temperature: 20 ° C

iii. Duration: 3 minutes

7. Heating the side walls of the bottle with hot air (400 ° C)

i. Shrinkage of the walls of the bottle

ii. The pressure inside the bottle rises

8. Fast bottle cooling

i. Cool by spraying with water at 20 ° C until the container and its contents return to ambient temperature.

Example 5

The bottle weighs 46 grams and has a petal bottom. The initial volume of the bottle is 1556 ml. After filling at 98 ° C in accordance with the operating mode, which will be described below, the volume of the bottle is 1455 ml. Thus, the shrinkage of the bottle during filling is 6.5%. After cooling, a slight positive relative pressure is established inside the bottle.

The bottle is filled in accordance with the following operating mode.

1. Placing an empty bottle

2. Rinse the bottle

3. Transferring the bottle to the loading post

4. Start cooling the outer wall of the bottle by spraying with water at a temperature of 5 ° C

a. Filling a bottle with water at 98 ° C

i. Duration of filling: 6 seconds

ii. Fill volume: 92%

b. Seal transfer

i. Duration: 1 second

c. Sealed bottle sealing

i. Sealing Duration: 1 second

5. The end of cooling the outer wall of the bottle

6. Shrinkage of the bottle in a free atmosphere

i. Shrink and sterilization phase

ii. Ambient temperature: 20 ° C

iii. Duration: 3 minutes

7. Fast bottle cooling

i. Cool by spraying with water at 20 ° C until the container and its contents return to ambient temperature.

8. Heating the sides of the bottle with hot air (400 ° C)

i. Shrinkage of the walls of the bottle

ii. The pressure inside the bottle rises

Claims (6)

1. A method of pouring liquid into a polymer container (1) having a high degree of molecular orientation, comprising the following steps:
- filling the container (1) with a liquid having a high temperature;
- cooling the walls (5) of the tank (1) at the stage of filling;
- hermetic sealing of the container (1);
- cooling the walls (5) of the container (1) at the sealing stage;
- passive shrinkage of the container (1) after the sealing step;
- cooling the walls (5) of the tank (1) after the shrinkage step. 2. The method according to claim 1, characterized in that only part of the walls (5) of the tank (1) are cooled. 3. The method according to claim 1 or 2, characterized in that after the step of sealing the walls (5) of the container (1) is heated, at least partially. 4. The method according to claim 1 or 2, characterized in that a gas (such as nitrogen or carbon dioxide) is added to the container (1) after the filling step and before the sealing step. 5. The method according to claim 3, characterized in that a gas (such as nitrogen or carbon dioxide) is added to the container (1) after the filling step and before the sealing step. 6. Capacity (1) of biaxially oriented polyethylene terephthalate (PET), designed for hot filling, without compensation inserts and obtained by the method according to any one of claims 1 to 5, characterized in that the degree of crystallization of its side walls (5) is less than 30% and that the volume of the container after filling is less than its initial volume.

Images