KR20030051675A - Molecular sieve containing structure for organoleptic scavenging - Google Patents

Abstract

The sensory water soluble multilayer cardboard base packaging uses molecular sieve powder to adsorb low molecular weight oxidation products during extrusion coating. 1 shows a polyethylene layer 10, a cardboard layer 12 and a low density polyethylene layer 14 containing molecular sieve powder.

Description

MOLECULAR SIEVE CONTAINING STRUCTURE FOR ORGANOLEPTIC SCAVENGING}

Adsorbents such as molecular sieves (echolites), clays, silicas and diatomaceous earths remove low molecular weight oxidation products formed during processing such as extrusion coating of polyolefins; Elimination of tastes and odors (such as sulfides from protein breakdown or hexanal from lipid oxidation) that occur as products in structural breakdown; It is used to remove ink or varnish odors that can be transferred from glass to the mat during storage in roll form or planar blank.

Manufacturers of products such as cereals and juices complain about the polymer smell and taste in cardboard-based gable-top boxes. In particular, this smell and taste is called plastic-lye. The gable top box has a polyolefin based product contact layer, such as low density polyethylene. The resulting odor and taste were found to be low molecular weight volatile oxidation products such as hexanal.

In addition, the smell and taste caused by the decomposition of the food contained in the package is also a problem. Oxidation of lipids in cereals forms hexanal, which gives cereals a distinct odor.

Thirdly, compounds that cause unwanted odors from printed substrates are also a problem.

Finally, it is also a problem to remove unwanted compounds from the product that are not the result of product degradation. For example, water containing fragrance or water containing by-product compounds from packaging or purification.

There are many patents for including zeolite molecular sieves in plastic materials to remove odor causing compounds generated during plastic material manufacture.

US 5,750,611 discloses thermoplastic compositions having adsorptive properties to reduce bad odors and aromas.

US Pat. No. 5,948,846 relates to polyolefin based compositions and moldings thereof. The use of 0.05-2% by weight zeolites in polyolefins containing 0.1-5% by weight fatty acid based lubricants for improved functionality in moldings and bottle caps is disclosed.

US 5,436,282 relates to the removal of taste / odor generating substances from plastics and to zeolites. Addition of 0.05-0.3 wt% zeolite to molten plastic is disclosed to reduce the generation of odor / taste generating materials in plastic water pipes and bottles.

US 5,934,079 relates to the use of zeolites in packaging fibers. WO94 / 03534 relates to a synthetic resin composition having an adsorption effect and a packaging film produced. The use of 0.5-20% by weight zeolite in low or medium density polyethylene or polypropylene is disclosed to bind gases formed during ripening and decomposition of fresh fruit.

These patents do not disclose paper based packaging structures nor do they disclose processing techniques such as extrusion coating.

The present invention relates to molecular sieves comprising structures for the removal of sensory water-soluble substances.

1 is a cross-sectional view of a laminate for packaging structures of the present invention.

2 is a cross-sectional view of yet another packaging structure laminate of the present invention.

3 is a cross-sectional view of yet another packaging structure laminate of the present invention.

4 is a cross-sectional view of yet another packaging structure laminate of the present invention.

5 is a cross-sectional view of yet another packaging structure laminate of the present invention.

* Symbol description *

10,22,42,64,82 ... low density polyethylene glass layer

12,24,44,66,84 ... Base stock cardboard substrate

14,30,60,76,94 ... low density polyethylene product contact layer

20,35,40,62,80 ... laminate

26,46 ... polyamide layer

28,48,54,58,70,74,88 ... tie layer

50,68,86 ... Low Density Polyethylene Polymer Layer

52.Low Density Polyethylene Functional Layer

56 High Barrier Ethylene Vinyl Alcohol Copolymer Layer

72 ... foil layer

90 ... metal-containing oriented polypropylene layer

92 Polyolefin Plastomer Layer

It is an object of the present invention to produce a molecular sieve containing paper based packaging structure which can capture non-specific low molecular weight organics inside the zeolite structure resulting in an improved product aroma and added during extrusion coating.

It is also an object of the present invention for a paper based packaging structure comprising molecular sieves to remove compounds such as hexanal to extend product shelf life.

It is also an object of the present invention to provide a paper based packaging structure comprising molecular sieves which will remove undesirable ink odors in the quality of the packaged food.

Adsorbents such as molecular sieves are used in cardboard laminates to remove compounds such as hexanal to extend product shelf life. The adsorbent removes low molecular weight oxidation products formed during processing such as extrusion coating of polyolefins such as low density polyethylene, high density polyethylene, linear low density polyethylene, metallocene, polypropylene and the like.

Molecular sieves are added to the cardboard packaging structure during extrusion coating. Molecular sieve powder is included in the product contact low density polyethylene layer in an amount of 5000-10000 ppm.

A cardboard packaging structure is produced that includes molecular sieves for removing sensory receptor material and is produced by extrusion or coextrusion coating.

In one aspect, molecular sieve powders such as Abscents 3000 (sold by UOP) or Smellrite (sold by UOP) are blended with polyolefins such as low density polyethylene using a twin screw extruder. A 10% masterbatch was dry blended with low density polyethylene and a cast film containing 1000 ppm (0.1%), 5000 ppm (0.5%) and 10000 ppm (1.0%) molecular sieve powder was produced. In Table 1 aldehyde octanal, nonanal and decanal are removed from the three films with an efficiency of at least 7-% compared to the low density polyethylene comparative film.

% Removal for LDPE comparison compound 0.1% 0.5% 1.0% Octanal 100 100 100 Nonanal 77 100 88 Decanal 81 100 72

A second test is performed by placing 0.5 grams of film into a 20 ml glass vial and sealing with a rubber stopper. A model solution containing 12 compounds, which may be a flavor component of food, a solvent for printing inks or varnish, is added to the vial in an amount of 3-4 micrograms for each compound. Store at 140 ° F. for 2 hours to facilitate model solution volatilization and test removal rate for LDPE. The results are shown in Table 2. Three films remove significant amounts of low molecular weight compounds. The preferred flavoring component of the orange juice is so large that it does not enter the molecular sieve pores and is therefore not removed.

% Removal for LDPE comparison compound 0.1% 0.5% 1.0 Butanal 24 73 85 Isopropyl Acetate 8.5 62 89 3-methylbutanal 0.4 65 93 MIBK 11 78 94 1-butanol 66 89 100 Pentanal 40 100 100 n-propyl acetate 47 97 100 1-pentanol 100 100 100 Hexanal 32 79 81 4-heptanol 31 94 100 d-limonene 0 0 0

A 0.5 gram film is placed in 15 ml of water and u.5-10 micrograms of component is added to the sample in the model solution to evaluate the ability of the film to be removed from the aqueous solution at room temperature and refrigerated. Samples stored at 73-40 ° F. for 2 hours and evaluated give results in Tables 3 and 4.

Film stored at 73 ° F % Removal for LDPE comparison compound 0.1% 0.5% 1.0 MIBK 0 29 39 n-propyl acetate 33 82 100 1-pentanol 100 100 100 Hexanal 45 100 100 4-heptanol 61 100 100 d-limonene 0 0 0

Film stored at 40 ° F % Removal for LDPE comparison compound 0.1% 0.5% 1.0 MIBK 4.7 25 39 n-propyl acetate 38 83 100 1-pentanol 100 100 100 Hexanal 56 100 100 4-heptanol 69 96 89 d-limonene 0 0 0

A gable top carton containing 22 pounds / 3 msf LDPE product contact layer with or without 1% molecular sieve is extrusion coated at 600 ° F. Fill the cardboard with spring water, store at 100 ° F for 3 hours, leave overnight at room temperature, and perform sensory testing using standard triangulation tests. There is a statistically significant difference between the structures containing comparative LDPE and 1% molecular sieve powder at the 95% confidence level. Testers say that the comparative LDPE is waxy and has a strong plastic taste and odor. The analytical tests in Table 5 show a significant reduction of the five low molecular weight components in 1% box water.

% Removal for LDPE comparison compound One% Acetone 83 3-methylbutanal 100 Nonanal 77 Benzaldehyde 91 Decanal 64

The following is the cardboard packaging structure of the present invention (all weights are given in pounds / 3 msf).

A standard milk carton is made of laminate and the laminate 20 comprises a low density polyethylene glass layer (9-12 pounds, 10); Basestock cardboard substrates (166-265 pounds, 12); And a low density polyethylene product contact layer (16-22 pounds, 14) containing 1000-10000 ppm of molecular sieve powder added in the extrusion (FIG. 1).

Laminate 35, a second structure with added oxygen barrier properties, comprises a low density polyethylene glass layer (9-12 pounds, 22); Basestock cardboard substrates 166-287 lbs. 24; A layer of polyamide (5 lb, 26) such as nylon on the substrate inner surface; Tie layers such as modified polyethylene (1.5 pounds, 28); And a low density polyethylene product contact layer (5-22 pounds, 30) containing 1000-10000 ppm of molecular sieve powder added in the extrusion (FIG. 2).

A third cardboard container packaging structure made of laminate 40 includes a low density polyethylene glass layer (9-12 pounds, 42); Basestock cardboard substrates 166-287 lbs. 44; A polyamide layer (5 pounds, 46) such as nylon on the substrate inner surface; Tie layers such as modified polyethylene (1.5 pounds, 48); low density polyethylene layers (12-18 pounds, 50); Low density polyethylene sensory receptor layer (4 lbs., 52) containing 1000-10000 ppm of molecular sieve powder added in the extrusion; Tie layer (1.5 pounds, 54); High barrier ethylene vinyl alcohol copolymer layer (2 lb, 56); Tie layer (1.5 pounds, 58); And a low density polyethylene product contact layer (4 pounds, 60) containing 1000-10000 ppm of molecular sieve powder added in the extrusion (FIG. 3).

The cardboard packaging structure also includes a foil barrier layer and laminate 62 includes a low density polyethylene glass layer (9-12 pounds, 64); Basestock cardboard substrates (128-287 lbs., 66); Low density polyethylene layer (12 pounds, 68); Tie layer (2-3 pounds, 70); Foil layer 72; Tie layer (2-8 pounds, 74); And a low density polyethylene product contact layer (15-25 pounds, 76) containing 1000-10000 ppm of molecular sieve powder added in the extrusion (FIG. 4).

Yet another structure includes a low density polyethylene glass layer (9-12 pounds, 82) as a laminate 80 comprising a metallized oriented polypropylene layer; Basestock cardboard substrates (128-287 lbs., 84); Low density polyethylene layer (12 pounds, 86); Tie layer (2-3 pounds, 88); Metallized oriented polypropylene layer 90; Polyolefin plastomer layers (2-8,92) such as those sold as Affinity P71450 by Dow; And a low density polyethylene product contact layer (15-25 pounds, 94) containing 1000-10000 ppm of molecular sieve powder added in the extrusion (FIG. 5).

The cardboard packaging structure of the present invention may include various types of molecular sieve combinations.

Claims (5)

Polyolefin polymer glass layer; Cardboard substrates; And Cardboard packaging containers with sensory receptor removal properties made from laminates containing a low density polyethylene product contact layer containing 1000-10000 ppm of molecular sieve powder added to low density polyethylene during extrusion The method of claim 1, further comprising: a nylon layer; And A cardboard packaging container further comprising a tie layer extruded between the cardboard substrate and the product contact layer 3. The method of claim 2, further comprising: a low density polyethylene inner layer; A low density polyethylene inner layer containing 1000-10000 ppm of molecular sieve powder added to the low density polyethylene inner layer during extrusion; Second tie layer; High barrier ethylene vinyl alcohol copolymer layers; And And a third tie layer, all extruded between the tie layer and the product contact layer. 10. The method of claim 1, further comprising: a low density polyethylene inner layer; Tie layer; Foil layer; And A cardboard packaging container further comprising a second tie layer extruded or laminated between the cardboard substrate and the product contact layer 10. The method of claim 1, further comprising: a low density polyethylene inner layer; Tie layer; Metallized polypropylene layer; And A cardboard packaging container further comprising a polyolefin plastomer layer extruded between the cardboard substrate and the product contact layer