JPS6321453B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to food casings. More specifically, the present invention relates to food casings used in the production of processed meat foods such as ham and sausage. In general, the type of sausage called dry sausage undergoes intense drying during the manufacturing process.
The moisture content has been reduced to less than 35%. Therefore, the casing used for this type of sausage is
A necessary condition is that the casing and the meat do not separate due to shrinkage of the meat during the drying process. For this reason, the casing is usually treated with an adhesion treatment to ensure that the meat and the casing are in close contact with each other so that the casing does not separate from the meat even when the meat contracts. Methods for attaching adhesive to the casing include injecting the adhesive into the inside of the casing just before the dryer, squeezing out the excess amount, and drying it (slug method); or injecting the adhesive onto the inner surface of the casing through a mandrel during shearing. A method of spraying (spraying method), a method of mixing an adhesive in the bath of the final wet tank and allowing it to penetrate from the outside of the casing to reach the inner surface (infiltration method), There are methods such as adding an adhesive and molding (viscose mixing method), all of which have advantages and disadvantages and cannot be said to be a perfect method, but from the viewpoint of operability and quality stability, the viscose mixing method is recommended. It is most desirable to be able to hire. However, even if the viscose mixing method is adopted, conditions are imposed such that the adhesive used here must be uniformly mixed with the viscose and must not fall off during the manufacturing process, especially during hot water washing baths. become. Furthermore, since the admixed adhesive is uniformly present throughout the entire thickness of the film, the effective amount exposed to the essential inner wall surface is only a portion of the added amount, thus ensuring sufficient adhesion performance. I'm running into a problem where it doesn't work. Therefore, in order to solve this problem, it is necessary to increase the amount of adhesive agent mixed in, but this results in a decrease in the physical properties of the film and also causes the casing to burst when filling the sausage. . That is, it is not possible to simultaneously satisfy the adhesion performance and strength of the casing. The present inventors conducted various studies to solve these problems. As mentioned above, adhesion to meat is controlled by the properties of the inner surface of the casing, so if the adhesive can be mixed only into the inner surface of the casing, it will not substantially impair the physical properties of the entire casing. , it is possible to achieve the intended purpose. As a means of realizing this, a method similar to the method for manufacturing composite films by coextrusion of thermoplastic resins can be considered, but in the case of thermoplastic resins, by coextruding molten resins from a die, Although it is easy to obtain a composite film, when molding is performed by extruding a viscose liquid into a coagulation bath, a perfectly laminated composite film cannot be obtained even if viscose liquids with different compositions are coextruded. There was a lot of doubt as to whether or not it was. However, when the viscose liquid for the outer layer and the viscose-adhesive mixture liquid for the inner layer are combined immediately before being discharged into the coagulation bath and then coagulated, the outer layer portion and the inner layer portion are laminated well. A composite film is obtained which can be used as a food casing with favorable properties. Such composite films can be obtained not only from cellulose composite films regenerated from viscose, but also from those regenerated by the copper ammonia method, from saponified acetyl cellulose, and from cellulose ethers such as ethyl cellulose. , and the object of the present invention can be achieved as well. A preferred composite film is
Since it is still a viscose cellulose, the following description will mainly focus on its coextruded composite film. Accordingly, the present invention relates to a food casing comprising a composite film of an outer layer of regenerated cellulose and an inner layer of a regenerated cellulose-adhesive mixture. Co-extrusion of the viscose liquid is achieved by providing concentric inner and outer viscose liquid passages in a viscose cylindrical film manufacturing die, and merging these passages just before the discharge port of the annular orifice that contacts the coagulation bath. Using a die with a unique structure, the viscose liquid is passed through the outer passage and the viscose-adhesive mixture liquid is passed through the inner passage, and after these are combined just before the annular orifice discharge port, they are pushed into the coagulation bath. It is done by putting out. The outer viscose layer is coagulated by an external coagulation bath surrounding the extruded tube, while the inner viscose-adhesive mixture layer is coagulated by an internal coagulation bath pumped from a die section in the center of the annular orifice. solidified by The coagulation bath is generally used and has a composition of 5 to 12% sulfuric acid, 5 to 15% sodium sulfate, and 10 to 30% ammonium sulfate, and is suitable for coagulation of the viscose layer in which the adhesive is mixed. The same internal coagulation bath is also used. In the composite film obtained by such coextrusion method, the outer layer of viscose cellulose and the inner layer of the viscose cellulose-adhesive mixture are clearly laminated to form two layers, as shown in the photomicrograph. Furthermore, both layers were reliably bonded, and no peeling phenomenon was observed during use. Various adhesives have been used for food casings, but in the embodiment of the present invention in which the adhesive is mixed with the viscose liquid, the adhesive is uniformly mixed with the viscose liquid. It is necessary that the solubility and properties are not impaired by alkali. Furthermore, even if the adhesive is mixed uniformly, if it is eluted into the bath during the process, especially during the hot water washing process, the effect of its addition will be diminished, so the adhesive will not be absorbed into the water. It is limited to those that are insoluble, thermocoagulable, or have a large molecular weight and cannot be used to dialyze cellulose membranes. Various properties including these required properties, specifically adhesion performance, health and safety, operability, handling,
In terms of stability and cost, polyvinyl acetate,
Ethylene-vinyl acetate copolymers, serum albumin, gelatin, and the like are preferably used as adhesives. The adhesive force depends on the adhesion performance of the adhesive and the amount of adhesive applied to the casing, and the amount of adhesive is determined by the mixing ratio of the adhesive and the viscose liquid forming the inner layer film. The mixing ratio of adhesive to cellulose in viscose is 1 or more in the case of polyvinyl acetate and ethylene-vinyl acetate copolymer, and 1 or more in the case of serum albumin and gelatin.
A range of 0.3 or more is preferable, and each shows good adhesion. Naturally, as the ratio of adhesive increases, the physical properties of the casing will be affected, so it is desirable to make the inner layer as thin as possible.
When the thickness of the inner layer is reduced to about 5% of the total thickness of the composite film, there is no substantial effect on the physical properties.
The necessary adhesion force can be secured. Table 1 below
describes the strength and elongation values in the longitudinal and lateral directions for a composite film with a thickness of 40μ when the type of adhesive and the thickness ratio of the inner layer mixed with it are varied.

[Table] Adhesion performance is determined by measuring the adhesion force of the casing to the dry sausage, but simply measuring the force required to peel the inner layer side of a 30 cm wide composite film from the kamaboko. This can be used as a guideline. The results obtained are shown in Table 2 below.

[Table] Note that if the adhesion is 200 g/30 mm or more, the casing and sausage meat will not separate and there will be no practical problem. As described above, in the present invention, by forming a composite film in which a layer made of a regenerated cellulose-adhesive mixture is provided on the inside of a casing made of a regenerated cellulose film, when the composite film is used as a food casing, it can be used as a casing. This makes it possible to improve the adhesion to meat without losing film properties. Similarly, when forming the inner layer, if a coloring agent, a release agent, an anti-blocking agent, etc. are mixed with the regenerated cellulose solution, a casing with reflective properties, gloss, releasability, opening properties, etc. can be obtained. can. Next, the present invention will be explained with reference to examples. Example 1 A viscose cylindrical film manufacturing die having concentric inner and outer viscose liquid passages was used, and the outer passage was filled with viscose liquid at an amount of 560 ml/min.
In addition, in the inner passage, 60ml/min of viscose-15
% gelatin solution (volume ratio 2:1) mixture is supplied by a metering pump. These inner and outer layer liquids join together just before the annular orifice discharge port, and are extruded into the coagulation bath as a single cylindrical film.
Inside this extruded cylindrical film, there is an internal coagulation bath with a composition of 5% sulfuric acid, 10% sodium sulfate, and 20% ammonium sulfate, and an external coagulation bath with the same composition outside. are supplied and used. The solidified film formed into a cylindrical shape is flattened, recycled, washed with water, desulfurized, bleached, softened, and then dried by a conventional method. The obtained cylindrical film had a diameter of 42 mm and a thickness of 40 μm, and observation by micrograph showed that the outer layer portion and the inner layer portion were laminated well at a thickness ratio of 10:1. This cylindrical film is used as a casing, and salami emulsion is filled into it using techniques known in the art. After drying, smoking, and shoeing,
It was dried for about two weeks at a relative humidity of 70% and a temperature of 13°C. The manufactured sausage has a casing that is completely adhered to the meat and has a glossy and excellent appearance. In order to measure the adhesion force of the casing to the meat, we made a 30mm wide cut in the vertical direction of the sausage and measured the force required to peel the film from the meat in that area using a spring scale.
The value of mm was obtained. On the other hand, when a casing made only of viscol cellulose was used, the meat stuffed therein floated up from the casing, giving it an extremely unsightly appearance. Example 2 In Example 1, the inner passage of the glass contained 55 ml.
viscose-10% albumin solution (volume ratio 8:
3) A similar series of treatments was performed except that the mixed solution was supplied. The diameter of the formed cylindrical film is 40mm, and the thickness is
It has a thickness of 39μ, the ratio of the thickness of the outer layer to the inner layer is 10:1, and when it is used in a salami sausage casing, the adhesion force to meat is 500μ.
The value was 550 g/30 mm, which was completely satisfactory. Furthermore, when the sausage was sliced into thin rounds and the casing was removed, the surface of the meat remained clean and shiny without any damage.

Claims (1)

[Scope of Claims] 1. A food casing comprising a composite film of an outer layer of regenerated cellulose and an inner layer of a regenerated cellulose-adhesive mixture. 2. The food casing according to claim 1, wherein the regenerated cellulose is viscose cellulose. 3. The food casing according to claim 1, wherein the composite film is a coextruded film.