RU2254996C1 - Material and a method of production of packages for drinks - Google Patents

Abstract

FIELD: production of a material and a method of .

SUBSTANCE: the invention is pertaining to a material and a method of manufacture of bottles from polyethylene terephthalate (PET). The invention offers to use as a material a composition based on PET granulate (98.8 - 99.15 mass %) and additionally containing a coloring agent with an additive of UV-absorber (1.2 - 0.85 mass %). At that use PET granulate with an increased value of inherent viscosity making 0.80 - 0.84 dl/g, preferably 0.82 dl/g. The method of production of bottles includes manufacture of a hollow finger-shaped work-piece - a preform with its following inflation. At that the polyethylene terephthalate granulate and a coloring agent with the additive of UV-absorber are injected with the help of a batcher during the perform production process, which on the stage of inflation are heated to the temperature of 125°- 135°С. Introduction into the material composition of an additional coloring agent with the additive of the UV-emission-absorber in the fixed quantitative ratio directly during production of the performs, that ensures enhancement of an affective protection of the polymer against photochemical decomposition due to decrease of negative affect of UV-emission on the material at preservation of the required mechanical properties.

EFFECT: the invention ensures enhancement of the polymer affective protection against photochemical decomposition, decrease of UV-emission negative affect on the material, preservation of its required mechanical properties.

11 cl, 2 dwg, 1 ex

Description

The group of inventions relates to a material and method for manufacturing small containers for storing food products (mainly drinks), and more particularly, to a material and method for manufacturing bottles from polyethylene terephthalate.

The manufacturing techniques for small containers such as cans, bottles made of polyethylene terephthalate (hereinafter referred to as PET) are widely known.

The following materials, as well as methods for manufacturing small containers from PET, should be considered as analogues of the proposed inventions.

A known method of manufacturing cans for products from PET (patent EP No. 0320151, 1989, MKI B 65 D 1/02), providing for the execution of the shell of the cans from the previously obtained hollow finger-shaped blanks - preforms with a throat for air supply, followed by blowing and molding the blanks into a press -form of a given configuration of a certain form.

The use of dyes in the manufacture of PET bottles is known (see the catalog of the 8th International Specialized Exhibition of Plastics and Rubber “INTERPLASTICA 2004” p.64-101).

Known use in the manufacture of packaging material for food products is UV absorbers (RF patent No. 2107684, 1998, MKI C 07 D 249/20).

A known method of producing bottles from PET (see the prospectus of the company “Mannesman Demag Plastics Service”, exhibition “Packing 99”, Moscow, 13.12-16.12. 1999, Expocenter), which is the closest in technical essence (prototype for the material and method). A method for producing such a container involves the preliminary manufacture of a finger-shaped, usually with a throat, intermediate preform in the form of a so-called PET preform, which is obtained, for example, by injection on automatic molding machines. These one-piece blanks are used to produce bottles of various shapes and capacities. Bottles are made at a temperature above the glass transition temperature on special equipment (pneumatic molding machines) by blowing, followed by drawing in a mold of a given configuration immediately before pouring liquid products with subsequent capping.

It should be noted that the known materials, as well as the manufacturing technology of small containers, do not allow creating a package that, when stored for a long period, maintains the properties of the packaged product, including its taste.

The problem to which the invention is directed is as follows:

in choosing a material that is a composition with the optimal combination of ingredients used for the manufacture of the package, as well as the ratio of the ingredients of the composition, which allows for the production of the package (bottle) to preserve the properties of the packaged product (mainly drinks) when stored for a long period;

in a method of manufacturing small containers from the proposed material, in the process of which the final product is obtained - packaging (bottle), capable of preserving the properties of the packaged product (mainly drinks) when stored for a long period.

The introduction into the composition of the PET-containing material, additionally a dye with the addition of a UV absorber in a certain quantitative ratio during the preform manufacturing process, provides a synergistic effect consisting in enhancing the effective protection of the polymer from photochemical decomposition by reducing the negative effect of UV radiation on the material when preservation of the last required mechanical properties.

The specified technical result is achieved due to the fact that as a material it is proposed to use a composition based on PET granulate, and additionally containing dye with the addition of a UV absorber, in the following ratio of components, wt.%:

- PET granulate - 98.8-99.15

- Dye with the addition of a UV absorber - 0.85-1.2

The essential features characterizing the claimed invention in terms of material is the choice of the optimal composition of the ingredients of the composition and their quantitative ratio, making it possible only in this range of quantitative values to obtain the specified technical result.

In accordance with the invention, PET granulate is used with a higher intrinsic viscosity of 0.80-0.84 dl / g and preferably 0.82 dl / g.

PET granulate is preliminarily prepared by known methods, for example by polymerization between terephthalic acid and ethylene glycol, followed by cooling and granulation.

The size of the granules is classified by size by sieving, while particles of more than 8 and less than 2 mm are not allowed.

In accordance with the invention, the optimal particle size distribution of PET should be within:

2.0-8.0 mm - 92%;

less than 2.0 mm - 2%;

more than 8.0 mm - 6%.

In accordance with the invention, styrically hindered amines or spatially hindered amines can be used as UV absorbers.

In accordance with the invention, organic pigments of various colors are used as dyes.

In accordance with the invention, the dye with the addition of a UV absorber is used in pasty form.

The dye with the addition of a UV absorber in paste form is obtained by mixing these components in solution.

According to the invention, the dye with the addition of a UV absorber is used in granular form.

The dye with the addition of a UV absorber in granular form is obtained by extrusion through a forming head, followed by cooling and granulation.

The size of the granules is classified by size by sieving, while particles of more than 2 and less than 0.5 mm and dust are not allowed.

The optimal particle size distribution of the dye with the addition of a UV absorber should be within:

0.5-2.0 mm - 92%;

less than 0.5 mm - 2%;

more than 2.0 mm - 6%.

A method of manufacturing bottles from the proposed material involves the implementation of a bottle shell from a pre-obtained hollow finger-shaped preform - a preform with subsequent blowing, including drawing and blowing the preform into a mold of a given configuration.

In contrast to the known method for manufacturing small-sized PET containers in the claimed method, the starting ingredients — PET granulate and dye with the addition of a UV absorber — are introduced directly into the material cylinder of the injection machine during the manufacture of preforms, and the dye with the addition of UV absorber is fed using a dosing device, while in the stage of blowing up the processed preforms are heated to a temperature of 125-135 ° C.

Preform heating depends on the following ratio of components, wt.%:

Granulate PET - 98.8-99.15

Dye with the addition of a UV absorber - 0.85-1.2

As the dye content with the UV absorber increases from 0.85 to 1.2, the energy intensity increases, and the heating power of the preforms decreases.

As a metering device, dispensers with a dispensing interval of at least 0.01-2.0% are used.

Figure 1 presents graphical materials illustrating the dependence of the degree of transmission of UV material (T%) on the wavelength (λ nm).

In figure 1, under No. 1, a material adopted as a comparison is shown, characterized by the following ratio of components, wt.%:

Granulate PET - 99.7

Dye - 0.3

In figure 1 under No. 2 shows a material characterized by the following ratio of components, wt.%:

Granulate PET - 99.15

UV Absorbent Dye - 0.85

Figure 1 under No. 3 shows a material characterized by the following ratio of components, wt.%:

Granulate PET - 98.8

Dye with the addition of a UV absorber - 1.2

Figure 2 presents graphical materials demonstrating the preservation of the taste of the packaged product over time. Moreover, as an indicator characterizing the quality and taste of the packaged product (beer), we used the total indicator of the oxidized forms (mg / l), for example, such as 2-methylbutanal, 3-methyl-2-butene-1-thiol depending on time storage t (month).

In FIG. 2 under No. 1 shows a material adopted as a comparison, characterized by the following ratio of components, wt.%:

Granulate PET - 99.7

Dye - 0.3

In FIG. 2 under No. 2 shows a material characterized by the following ratio of components, wt.%:

Granulate PET - 99.15

UV Absorbent Dye - 0.85

The following example illustrates the invention.

Example 1

The manufacture of small containers, such as bottles, from the proposed material is carried out using the proposed method as follows.

The manufacture of preforms includes the following steps.

PET granulate is used with a higher intrinsic viscosity, preferably 0.82 dl / g.

The size of the granules is classified by size by sieving, while particles of more than 8 and less than 2 mm are not allowed. Granulate PET is pre-drained.

Granular dye with the addition of a UV absorber is obtained by extrusion through a forming head, followed by cooling and granulation.

The size of the granules is classified by size by sieving, while particles of more than 2 and less than 0.5 mm and dust are not allowed.

The ratio of the components of the composition is chosen in the following limits wt.%:

Granulate PET - 99.0

Dye with the addition of a UV absorber - 1.0

Granulate PET is fed into the material cylinder of the injection machine, where dye with the addition of a UV absorber in the specified quantity is fed simultaneously using a metering device.

As the metering device, standard dispensers (manufactured by leading companies) with a dispensing interval of at least 0.01-2.0% are used.

In the material cylinder of the injection machine, uniform distribution of PET granulate and dye occurs with the addition of a UV absorber. The processed material in the injection unit of the injection molding machine is plasticized, transferred to the melt, and then injected under pressure into the closed mold for product design. The design of the product in the mold involves holding under pressure and cooling, after which the opening of the injection mold occurs.

Bottles of preforms obtained by the above method are made on a blow molding machine with a blow-out method.

The essence of the blowing method is that the processed preforms on the heating carousel pass the heating section, then the preform is drawn using a pneumatic cylinder under reduced pressure, after which the final molding and cooling of the PET bottle takes place under the action of higher pressure.

During the manufacturing process of the bottle, the preforms being processed pass the heating section on the heating carousel, which consists of heating boxes equipped with infrared emitters and an air shower.

When choosing the above ratio of components, the heating temperature of the preforms measured by the pyrometer by the non-contact method is not more than 135 ° C, while the heating power is not more than 75% of the total installed capacity of the equipment.

Thus, the example describes a specific solution to the problem of creating a bottle for beer, which for a long period is capable of maintaining the properties of the packaged product, including its taste, during storage.

As the proven technology shows, going beyond the claimed quantitative ratios of the composition of the ingredients of the composition - the material and not observing the specified technology for producing small containers leads to failure to achieve a technical result.

Claims (11)

1. Material for the manufacture of small containers based on polyethylene terephthalate, characterized in that it further contains a dye with the addition of a UV absorber in the following ratio of components, wt.%: Polyethylene terephthalate granulate - 98.8 ÷ 99.15 Dye with the addition of a UV absorber - 0.85 ÷ 1.2 2. The material according to claim 1, characterized in that the polyethylene terephthalate granulate is used with a higher intrinsic viscosity of 0.80 ÷ 0.84 dl / g and preferably 0.82 dl / g. 3. The material according to claim 1, characterized in that the optimal particle size distribution of polyethylene terephthalate should be within: 2.0-8.0 mm - 92% less than 2.0 mm - 2% more than 8.0 mm - 6%. 4. The material according to claim 1, characterized in that the UV absorber is selected from the group of sterically hindered amines and spatially hindered amines. 5. The material according to claim 1, characterized in that the dye is selected from the group of organic pigments of various colors. 6. The material according to claim 1, characterized in that the dye with the addition of a UV absorber is used in pasty form. 7. The material according to claim 1, characterized in that the dye with the addition of a UV absorber is used in granular form. 8. A method of manufacturing small containers from a material containing granules of polyethylene terephthalate and a dye with the addition of a UV absorber, comprising the manufacture of a hollow finger-shaped preform - a preform with subsequent blowing, including drawing and blowing the preform into a mold to form a bottle of a given configuration, characterized in that granules of polyethylene terephthalate and dye with the addition of a UV absorber are introduced during the manufacture of preforms, which are heated to a temperature of 125-135 ° C during the blowing stage. 9. The method according to claim 8, characterized in that the heating of the preforms depends on the following ratio of components, wt.%: Polyethylene terephthalate granulate - 98.8 ÷ 99.15 Dye with the addition of a UV absorber - 0.85 ÷ 1.2 10. The method according to claim 8, characterized in that the dye with the addition of a UV absorber is introduced through a metering device. 11. The method according to claim 10, characterized in that dispensers with a dispensing interval of at least 0.01 ÷ 2.0% are used as the dispensing device.

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