JPH104866A - Casing for food smoking and storing and smoked food - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a casing for smoking and storing food, useful for both, the primary and the secondary packing, that is, enabling the packaging of raw material of food processing and the performance of good smoking treatment for ham, sausage, etc., and endurable for a long storage in the state as it is. SOLUTION: This casing is made of a heat shrinkable tube consisting of one layer of a nylon resin layer and at least one layer of a modified polyolefin resin layer having good adhesivity to the nylon resin layer, in which the thickness of the modified polyolefin resin layer is in the range of 1-25μm. Alternatively, the heat shrinkable tube consists of at least one layer of nylon resin layer, at least one layer of a modified polyolefin resin layer having good adhesivity to the nylon layer as an intermediate layer and at least one layer of polyolefin resin layer, in which the thickness of the total of the modified polyolefin resin layer and the polyolefin resin layer is in the range of 1-25μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food smoking and storage which can be filled with raw materials of processed foods such as ham and sausage and can be smoked well and which can withstand long-term storage. The present invention relates to a casing for use.

[0002]

2. Description of the Related Art In manufacturing and selling food smoked products,
Generally, two-stage packaging, that is, primary packaging and secondary packaging is performed. The primary package is a package that is used for the purpose of maintaining the shape when the food is smoked, and uses a material having good gas permeability so that the smoke component penetrates into the inside of the package. However, materials with good gas permeability also transmit water vapor,
If the primary packaging remains, the weight of the contents will decrease over time, leading to a loss of commercial value. So after smoke treatment,
The secondary packaging is performed by using a material having low water vapor permeability by overlapping or replacing the primary packaging.

At present, natural casings such as animal intestines and fibrous casings obtained by coating and impregnating viscose on paper are used as food casings for primary packaging that can be smoked. These casings have the advantage that they are smokeable and their effect is very great. However, the intestines of animals cannot sufficiently meet the demand for ham and sausage casings subjected to smoke treatment, and the intestines are irregular in shape, so that it is difficult to produce hams and sausages of a fixed shape. In addition, depending on the state of health of the animal, those with weak intestines frequently occur. Although fibrous casing is used to compensate for the lack of natural casing such as animal intestines, it has an unpleasant odor and deterioration due to long-term storage, and has a crunchy and hard touch. If it is not hydrated by immersion in ham, it will not be possible to obtain flexibility suitable for filling ham and sausage foods. Also, since the paper is the base material, the point that the content is not directly visible because it is white and opaque is unacceptable in the Japanese market, so after smoking treatment, the fibrous casing for smoking is removed, and then the transparent plastic film packaging for storage and sale It is not only time-consuming, but also highly likely to be contaminated with germs during this operation. In addition, since there is a high permeability to water vapor, there is a problem that weight loss during smoking is large. Furthermore, the pollution at the time of producing the raw material viscose cannot be ignored. Japanese Patent Publication No. 6-73428 proposes a smoke casing made of a single-layer film of nylon or a nylon-based blend resin, stating that the weight of the filled food product is maintained even after long-term storage. However, in the data of the examples, the weight loss of 1.0% was already shown after 4 days of smoking, and further improvement in performance is required in practical use.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to fill a raw material of processed foods such as ham and sausage and to perform a good smoking treatment, and to store the raw materials for a long time. The present invention relates to a casing for food smoking and storage which can withstand both primary packaging and secondary packaging.

[0005]

SUMMARY OF THE INVENTION A casing for smoking and storing food according to the present invention has a heat-shrinkable casing having one nylon resin layer and at least one modified polyolefin resin layer having good adhesion to the nylon resin. In the flexible tube, the thickness of the modified polyolefin resin layer is in the range of 1 to 25 μm, or at least one layer of a nylon resin and at least one layer of a modified polyolefin resin layer having good adhesion to the nylon resin in the middle. And a heat-shrinkable tube having at least one polyolefin-based resin layer, wherein the total thickness of the modified polyolefin-based resin layer and the polyolefin-based resin layer is in the range of 1 to 25 μm.

The nylon resin layer has a low oxygen permeation amount,
Permeates smoke components well. However, the effect of suppressing the release of moisture from the filler is inferior. A modified polyolefin-based resin layer having a thickness of 1 to 25 μm, or a total thickness of 1
The modified polyolefin-based resin layer and the polyolefin-based resin layer having a thickness in the range of ２５25 μm permeate the smoke component well and suppress the diffusion of water from the filler, but have a large oxygen permeation amount.
The casing of the present invention has a multi-layer structure combining these functional characteristics, so that it can be filled with raw materials for processed foods and subjected to good smoke treatment, and can withstand long-term storage as it is. As a result, the primary packaging and the secondary packaging can be combined.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The casing of the present invention has the function that each layer performs, that is, the nylon resin layer suppresses oxygen permeation, and the modified polyolefin resin and the polyolefin resin layer suppress the diffusion of water from the filler. It is possible to fill the raw materials of processed foods by the combination and perform good smoking treatment, and it can withstand long-term storage as it is, and it can be used for both primary packaging and secondary packaging, The same effect is obtained even if the order of each layer is changed.
However, the portion adjacent to the nylon resin layer from the viewpoint of adhesiveness must be a modified polyolefin-based resin layer having good adhesion to the nylon resin. Specifically, the nylon resin layer is abbreviated as N, the modified polyolefin-based resin layer is abbreviated as M, and the polyolefin-based resin layer is abbreviated as O.
A two-layer structure called (outside) / M (inside) or M / N, or a three-layer structure called N / M / O or 0 / M / N is included.

The modified polyolefin resin having good adhesiveness to a nylon resin includes homo- or copolymers of olefins such as ethylene, propylene and butene, and unsaturated carboxylic acids such as maleic acid and fumaric acid or their unsaturated carboxylic acids. Copolymerization of derivatives such as acid anhydrides, esters or metal salts,
For example, a modified polymer obtained by graft polymerization can be exemplified as a typical example, and these may be used alone or in a mixture with another component such as a polyolefin resin.

Examples of the polyolefin resin include, for example, olefin homopolymers, mutual copolymers, and copolymers with other copolymerizable monomers such as other vinyl monomers. Specifically, for example, polyethylene, polypropylene, polybutene of various densities ranging from low density to high density, their mutual copolymers, ionomer resins, ethylene-acrylic acid copolymers, ethylene-vinyl acetate copolymers and the like are exemplified. it can. The above polyolefin resins can be used alone or in combination of two or more.

It is important that the thickness of the modified polyolefin-based resin layer or the total thickness of the modified polyolefin-based resin layer and the polyolefin-based resin layer is in the range of 1 to 25 μm. If the thickness exceeds 25 μm, the smoke effect becomes insufficient or the smoke treatment takes too long. On the other hand, when the thickness is less than 1 μm, the weight loss of the contents during storage increases.

As the nylon resin, nylon 6, nylon 6, 6 or a copolymer thereof is preferably used. The total thickness of the layer made of nylon resin is 5 to 5
A range of 0μ is appropriate. Although a slight increase or decrease is unavoidable, if it is less than 5μ, the amount of oxygen permeation increases, and if it exceeds 50μ, smoking takes too long. More preferably, the range is 10 to 20 μm.

The heat shrinkage rate of the heat shrinkable tube is 95 ° C. ×
It is preferable to set the height and width to around 30% in 30 seconds. The laminated tube is manufactured by an appropriate method such as co-extrusion. The shrinkage of the laminated tube is preferably provided by biaxial stretching after extrusion of the laminate, but for certain products it can also be obtained by stretching in the machine or transverse direction to the finished casing. A tubular casing can be obtained by co-extrusion without a seam, but can also be obtained by stacking laminated sheets and welding or bonding the seam.

Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to the following Examples.

[0014]

Example 1 Nylon 6-66 = 85: 15 copolymer resin [density: 1.1]
3 g / cm ³ ; Melt flow rate: 2.6 g / 10 min (230 ° C.); Melting point: 200 ° C .; Glass transition point: 132
° C], modified low-density linear polyethylene resin (modified L-LDPE) by maleic anhydride graft polymerization [density:
0.94 g / cm ³ ; melt flow rate: 1.3 g / cm ³
10 minutes (190 ° C.); melting point: 120 ° C .; Vicat softening point: 110 ° C.] and low-density linear polyethylene resin (L
-LDPE) [density: 0.915 g / cm ³ ; melt flow rate: 2.3 g / 10 min (190 ° C.);
20 ° C; Vicat softening point: 102 ° C], and co-extruded to form a cylindrical film, biaxially stretched three times in length and width simultaneously and folded 90 mm in thickness, outer layer: nylon / 15μ;
Intermediate layer: modified L-LDPE / 5μ; inner layer: L-LDPE
A casing composed of a three-layer film having a thickness of / 20μ and a total thickness of 40μ was obtained. Shrinkage rate of 95 ° C x 30 seconds is 30% in both length and width
Met.

[0015]

Embodiment 2 In the same manner as in Embodiment 1, the folding width is 90 mm,
Outer layer: Nylon / 15μ; Intermediate layer: Modified L-LDPE /
5 μ; Inner layer: L-LDPE / 15 μ, a casing made of a three-layer film with a total thickness of 35 μ was obtained. The shrinkage at 95 ° C. for 30 seconds was 30% in both the vertical and horizontal directions.

[0016]

Embodiment 3 In the same manner as in Embodiment 1, the folding width is 90 mm,
Outer layer: Nylon / 15μ; Intermediate layer: Modified L-LDPE /
5 μ; Inner layer: L-LDPE / 10 μ, a total thickness 30 μ of a three-layer film casing was obtained. The shrinkage at 95 ° C. for 30 seconds was 30% in both the vertical and horizontal directions.

[0017]

Embodiment 4 In the same manner as in Embodiment 1, the folding width is 90 mm.
Outer layer: Nylon / 15μ; Intermediate layer: Modified L-LDPE /
5 μ; Inner layer: L-LDPE / 5 μ, a casing consisting of a three-layer film having a total thickness of 25 μ was obtained. The shrinkage at 95 ° C. for 30 seconds was 30% in both the vertical and horizontal directions.

[0018]

Embodiment 5 In the same manner as in Embodiment 1, the folding width is 90 mm,
Outer layer: nylon / 25μ; middle layer: modified L-LDPE /
5 μ; Inner layer: L-LDPE / 5 μ, a casing made of a three-layer film with a total thickness of 35 μ was obtained. The shrinkage at 95 ° C. for 30 seconds was 30% in both the vertical and horizontal directions.

[0019]

Example 6 The L-LDPE layer of the film of Example 1 was peeled off, and a casing consisting of a two-layer film having a folding width of 90 mm, an outer layer: nylon / 15 μm, an inner layer: modified L-LDPE / 5 μm, and a total thickness of 20 μm was obtained. Was.

[0020]

EXAMPLE 7 Nylon 6-66 = 85: 15 copolymer resin and modified low-density linear polyethylene resin (modified L-LDPE) were coextruded through a mold having a double ring at the tip end to form a cylindrical film. Molded, biaxially stretched simultaneously three times vertically and horizontally, folding width 90 mm, outer layer: nylon / 1
5 μ; inner layer: modified L-LDPE / 10 μ, total thickness 25 μ
Was obtained. 95 ° C x 3
The shrinkage at 0 second was 30% in both length and width.

[0021]

Embodiment 8 Nylon 6-66 = 80: 20 copolymer resin [density: 1.1]
4 g / cm ³ ; melting point: 191 ° C.], modified L-LDPE used in Example 1, and L-LDP used in Example 1
E was co-extruded to form a cylindrical film, and simultaneously biaxially stretched three times vertically and horizontally, folding width 90 mm, outer layer: nylon / 15μ; intermediate layer: modified L-LDPE / 5μ; inner layer: L-LDPE / A casing composed of a three-layer film having a thickness of 15 μ and a total thickness of 35 μ was obtained. The shrinkage at 95 ° C. for 30 seconds was 30% in both the vertical and horizontal directions.

[0022]

Example 9 A three-layer film having the film of Example 2 turned upside down and having a folding width of 90 mm, an outer layer: L-LDPE / 15 µ, an intermediate layer: modified L-LDPE / 5 µ; an inner layer: nylon / 15 µ; Was obtained.

[0023]

Comparative Example 1 A commercially available fibrous casing having a folding width of 90 mm and a thickness of 85 μm was used.

[0024]

Comparative Example 2 In the same manner as in Example 1, the folding width was 90 mm,
Outer layer: nylon / 20μ; middle layer: modified L-LDPE /
5 μ; Inner layer: L-LDPE / 25 μ, a casing made of a three-layer film with a total thickness of 50 μ was obtained. The shrinkage at 95 ° C. for 30 seconds was 30% in both the vertical and horizontal directions.

[0025]

Comparative Example 3 Nylon 6-66 = 85: 15 copolymer resin was melt-extruded through a mold having a ring-shaped outlet at the end to form a cylindrical film. A casing made of a nylon single-layer film having a thickness of 90 mm and a thickness of 40 μ was obtained. The shrinkage at 95 ° C. for 30 seconds was 25% in both the vertical and horizontal directions.

[0026]

[Smoke test] 300 g of raw material which was made into a paste by mixing 69% by weight of minced pork, 24% by weight of water, 5% by weight of starch and 2% by weight of salt was mixed into casings of Examples and Comparative Examples.
Each was filled and sealed. Smoke room temperature about 75 ~ 80 ℃,
It smoked for 1 hour under conditions of relative humidity (RH) of about 40 to 60%. In the case of using the conventionally used fibrous casing of Comparative Example 1, the odor, taste, and color of the smoked product were evaluated as 10 points, and Examples and Comparative Examples 2,
Table 1 shows the results of the evaluation of the smoked product using the casing No. 3 by a plurality of experts.

[0027]

[Table 1]

As is clear from Table 1, the casings of the examples exhibited substantially the same smoking effect as the casings of Comparative Example 1 or Comparative Example 3 which were conventionally used as primary packaging for smoking. The casing of Comparative Example 2 in which the total thickness of the polyolefin-based resin layer and the polyolefin-based resin layer was 30 μm was insufficient in the smoking effect.

[0029]

[Storage test] In order to test the storage property, the sample produced by the above smoke test was kept at 18 ° C and the relative humidity was 40% in the package.
For 10 days. Table 2 shows the results of measuring the weight loss immediately after smoking and 10 days later.

[0030]

[Table 2]

When the casings of Example and Comparative Example 2 were used, weight loss was small after 10 days, and the surface was tight without wrinkles. When the casing (fiber lath) of Comparative Example 1 was used, the weight was greatly reduced after 10 days, and mold had occurred on the surface. When the casing of Comparative Example 3 (a single layer of nylon) was used, the weight loss after 10 days was intermediate between Examples 1, 2, and 3 and Comparative Example 1, but the film surface was wrinkled.

Based on the test results shown in Tables 1 and 2, Table 3 shows the overall evaluation as a food smoking / storage casing which serves both as a primary package for smoking and a secondary package for storage. .

[0033]

[Table 3]

[0034]

According to the present invention, the raw materials of processed foods such as ham and sausage can be filled to perform a good smoking treatment, and can withstand long-term storage as it is.

Continued on the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B32B 27/32 B32B 27/34 27/34 B65D 71/08 B65D 71/08 A23B 4/04 503Z

Claims (8)

[Claims] 1. A heat-shrinkable tube having one nylon resin layer and at least one modified polyolefin resin layer having good adhesion to the nylon resin, wherein the modified polyolefin resin layer has a thickness of 1 to 25 μm. Food smoking and storage casing characterized by the range. 2. The food / smoker according to claim 1, wherein the outer layer is a nylon resin layer and the inner layer is a modified polyolefin resin layer.
Storage casing. 3. The food / smoker according to claim 1, wherein the outer layer is a modified polyolefin resin layer and the inner layer is a nylon resin layer.
Storage casing. 4. A heat-shrinkable tube having at least one layer of a nylon resin layer, at least one layer of a modified polyolefin resin layer having good adhesion to a nylon resin in the middle, and at least one layer of a polyolefin resin layer, A food smoking / storage casing, wherein the total thickness of the modified polyolefin-based resin layer and the polyolefin-based resin layer is in the range of 1 to 25 µm. 5. The casing for smoking and storing food according to claim 4, wherein the outer layer is a nylon resin layer, the intermediate layer is a modified polyolefin resin layer, and the inner layer is a polyolefin resin layer. 6. The food smoking and storing casing according to claim 4, wherein the outer layer is a polyolefin resin layer, the intermediate layer is a modified polyolefin resin layer, and the inner layer is a nylon resin layer. 7. A heat-shrinkable tube having one nylon resin layer and at least one modified polyolefin resin layer having good adhesion to the nylon resin, wherein the modified polyolefin resin layer has a thickness of 1 to 25 μm. A foodstuff-filled casing for smoking and storage, characterized by being in a range. 8. A heat-shrinkable tube having at least one layer of a nylon resin layer, at least one layer of a modified polyolefin resin layer having good adhesion to the nylon resin in the middle, and at least one layer of a polyolefin resin layer, A smoked / storage casing filled with food, wherein the total thickness of the modified polyolefin-based resin layer and the polyolefin-based resin layer is in the range of 1 to 25 μm.