JPH06248595A - Heat-sealable casing and paper for casing - Google Patents

Abstract

PURPOSE:To facilitate seal forming without viscose, to maintain sufficient wet bursting strength, to readily carry out printing of a coloring matter and a flavor and bag making, to stand high packing pressure and to have excellent fitting to ham, etc. CONSTITUTION:Casing paper consists of 40-98% conjugate yarn of copolyester and 60-2% hydrophilic yarn. The conjugate yarn of polyester provides high bond strength by heat sealing and has slight shrinkage and occurrence of wrinkle at seal parts. Especially the polyethylene terephthalate at the core part has stable dimension and shape and slight occurrence of wrinkle and undulation even if the sheath part is highly deformed by heat sealing. The hydrophilic yarn can be beaten and the degree of beating is finely adjustable with water content. Heat-sealable casing is paper prepared by mixing conjugate yarn of polyethylene terephthalate and a copolyester as a main component with pulped natural fibers and papermaking or papermaking and joining. Heat-sealable casing heat-sealed by envelop pasting method has 5.1-8.3 wet bursting strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sealable casing and casing paper.

[0002]

2. Description of the Related Art Conventional casings such as fibrous are
To impart good wet burst strength to casing paper and to control elongation, various hemp fiber papers are impregnated with dilute viscose, coagulated, regenerated, washed with water, dried and formed into a tube,
A tubular packaging material has been proposed in which paper is embedded in a regenerated cellulose membrane after being filled with high-concentration viscose. This packaging material is cut to a required length, the bottom portion is sewn together to form a bag, and meat products and the like are filled.

The viscose used is prepared by dissolving, aging, sulfiding, aging and defoaming pulp with caustic soda, which is very time-consuming and costly. The meat filling pressure in the fibrous casing was about 2.
8 Kg / cm ² = high pressure type, about 1.4 Kg / cm ² =
There are low pressure type, high pressure type is hemp fiber paper 25g / m ²
Processed to about 50g / m ² of regenerated cellulose, low-pressure type 17g / m ² of regenerated cellulose to about 30g of regenerated cellulose
It has been processed to about g / m ² .

At present, handmade hams and the like are becoming more popular, and those having an indefinite shape are preferred, and low-pressure type fitting to the ham surface has come to be used. Further, the meat product is smoked, but for the purpose of shortening the smoke time and improving the smoke effect, a dye or flavor is directly or in combination with an edible film forming material attached to the inner surface of the casing, Casing manufacturing technology and casing capable of treating smoke for a short time with improved color (and flavor) by a method of transferring to the surface of meat products by smoking processing (JP-A-54-49364)
No. 57-155975, Japanese Patent Publication No. 61-137.
No. 90, Japanese Patent Fair 1-17653, Japanese Patent Fair 1-1765
No. 4) has been developed and put into practical use.

However, since it is formed in a tubular casing, it is difficult to attach the dye or flavor to the inner surface, so that it is inverted and attached to the outer surface, and then it is turned over and the inner and outer surfaces are inverted. The method of No. has been put to practical use. However, this method is particularly complicated, and thus it is troublesome and expensive.

In Japanese Examined Patent Publication No. 42959/1990, a layer (layer A) composed of pulped natural vegetable fibers and hydrophilic fibers such as rayon.
And a mixed paper layer consisting of a thermoplastic fiber (B layer) having hydrophobicity and heat sealability and an A layer having a basis weight of 24 g / US
There has been proposed a processed paper in which at least one side of the m ² laminated paper is subjected to viscose processing.

In JP-A-60-132756 (Japanese Patent Publication No. 43742/1992), a gas permeable substrate comprising a hydrophobic fiber and a hydrophilic fiber and a regenerated cellulose layer covering a part of the substrate is used as a gas permeable. A packaging material that can control the property has been proposed.

However, although these two materials are fused by heat, the fusion strength is not enough to be used as a casing for packaging meat products and has not been put to practical use.

[0009]

In the conventional fibrous casing, hemp fiber paper is subjected to viscose processing to provide seal formation and wet burst strength, but it is time-consuming and costly.

Further, since the casing is formed into a cylindrical shape by viscose processing, it is difficult to print the inner surface of the pigment and flavor, and the bottom portion is sewn with a sewing machine to form a bag, which is troublesome and costly. There was a problem that it took a lot. Further, since it is tubular, it is manufactured in consideration of the ham size, and if the ham size changes, there is a problem that it cannot be dealt with.

The meat filling pressure is 1.4 to 2.8 Kg /
Since it is as high as cm ² , there is a problem that the paper which is not treated with viscose has a low strength and bursts. In addition, the low-pressure type is an amorphous ham, so there is a demand for fitting.

By the way, the conventional heat seal paper is currently used as tea bag base paper, drain bag base paper, etc., but the heat seal strength is as low as 300 g / 15 mm or less at present.

Further, viscose-processed paper having a heat-sealing property proposed in Japanese Examined Patent Publication No. 3-16435 has a weak heat-sealing strength and is difficult to use as a fibrous casing.

That is, in the fibrous casing, the meat filling pressure is as high as 1.4 to 2.8 Kg / cm ^2, and the conventional heat-sealed paper cannot be used in the fibrous casing.

The heat-sealing paper includes polyethylene fibers, polypropylene fibers, polyvinyl chloride fibers, ethylene-vinyl acetate copolymer polymer fibers and the like as heat-softening fibers. However, in the fibrous casing, the sealing portion must withstand the filling pressure of the meat after bag making,
With heat-sealed paper using ordinary heat-softened fiber, the heat-sealed part becomes a film, which does not withstand the meat filling pressure,
Furthermore, the single fiber strength of the fiber is polyethylene = 1 to 2.5 g /
d, polyvinyl chloride fiber = 2 to 2.8 g / d, ethylene-vinyl acetate copolymer polymer fiber was weak at 0.7 g / d (polypropylene fiber = 4.5 to 7.5 g / d), and after becoming a paper material However, it became weak in strength and was difficult to use for fibrous.

The object of the present invention is to eliminate the above-mentioned problems of the prior art, in which a seal can be easily formed without using viscose and a sufficient wet burst strength can be maintained. However, it is to provide a heat-sealable casing that can easily print dyes and flavors and can be made into bags, and can withstand high filling pressure, and has good ham fit characteristics.

[0017]

SUMMARY OF THE INVENTION In order to solve the above problems, the gist of the present invention is a casing paper comprising a copolyester composite fiber and a hydrophilic fiber.

The copolyester conjugate fiber is preferable in that a high adhesive force can be obtained by heat sealing and that shrinkage and crease are less likely to occur in the sealed portion. In particular, polyethylene-terephthalate and copolyester core-sheath structure composite fibers are preferable. The polyethylene terephthalate fiber of the core portion has the function of stabilizing the dimensions and shape even if the sheath portion is highly deformed by heat sealing and reducing the occurrence of wrinkles and waviness.

That is, in the copolyester composite fiber of the present invention, as the fiber component to be combined, the high melting point component is significantly deteriorated by heat sealing, and in particular, the melting point between the low melting point component and the low melting point component does not occur. It is preferable that there is a difference in softening point. The low melting point as referred to in the present invention means one having a temperature characteristic of being softened or melted by a heat sealing machine used in the food industry. It is possible to use a polyester having a melting point lower than that of ordinary polyethylene terephthalate, but for example, two or more dicarboxylic acids such as terephthalic acid, isophthalic acid, sebacic acid, and 5-sulfoisophthalic acid metal salt as an acid component. There is a combination of. Alternatively, two or more kinds of ethylene glycol, diethylene glycol, 1,4 butanediol, polyethylene glycol and the like are combined as the diol component. Matting agents, slip agents, etc. may be added within the range permitted by the restrictions derived from the use as a packaging material.

Surface hydrophilicity is a particularly preferable characteristic of the copolymerized polyester conjugate fiber of the present invention. The surface hydrophilicity may be provided by using a water-immersive component such as 5-sulfoisophthalic acid metal salt or polyethylene glycol as the low melting point component, or by a substance applied to the surface after the fiber structure is formed. Due to this surface hydrophilicity, the composite fibers are stably dispersed, and the effect is maintained even after the completion of sheet formation. Copolymerized polyester conjugate fibers have surface hydrophilicity, and typical materials that give such surface hydrophilicity are copolymerization of hydrophilic groups, or terephthalic acid mixed with a hydrophilic polymer is isophthalic acid and sulfonated. Polyester copolymer containing isophthalic acid sodium salt, which is a mixture of alkylene oxide polymers or copolymers, or terephthalic acid, isophthalic acid, sodium sulfoisophthalic acid sodium salt, and multi-component copolymer of polyethylene glycol and ethylene glycol Etc. (JP-A-3-180587)
And JP-A-3-33837).

Such a surface hydrophilicity-imparting substance has been developed in recent years, and its application to polyester fibers has been rapidly spread and put into practical use for several years. Therefore,
Before this appearance, you can get effects that you could not expect.

The thickness of the fiber is 0.5 to 5 d (denier),
1 to 3d is preferable. Fiber length is 2-12m
m, preferably 3 to 9 mm. It is preferable that the fibers do not have crimps, but the waviness often exhibited in the side-by-side type composite fibers is acceptable.

The hydrophilic fiber can be beaten, and the degree of denseness can be adjusted by the beating degree and content. This fiber includes Manila hemp, sisal hemp, N.BKP, L.BKP,
U ・ BKP, linter, kenaf, mitsumata, mulberry, goose,
Other examples include wood pulp.

It should be noted that the heat-sealing is difficult to withstand the meat filling pressure by the joint bonding method, and the heat-sealing portion is
The heat seal is produced by the envelope sticking method because a sufficient effect cannot be obtained and white residue easily occurs.

In the present invention, the copolyester conjugate fiber is 40% to 98%, and the rest is hydrophilic fiber 60% to 2% to obtain a desired wet specific burst strength.

The heat-sealable casing has the following construction. The heat-sealable casing has high adhesive strength due to heat-sealing, less shrinkage and wrinkles in the sealed part, and retains the same strength as the wet burst strength of viscose-processed hemp fiber paper. And a copolyester composite fiber as a main component, and a paper made by mixing or combining pulped natural fibers and making a printed surface into a bag-shaped inner surface by a heat sealer.

Since the strength of the seal portion is more balanced as the longitudinal and lateral strengths of the casing are closer to each other, the longitudinal and lateral strength ratio is preferably 3: 1 or less. Further, in the case of ham, it may be preferable that the casing has transparency, and in this case, as a clarifying agent, pullulan, konjac paste, carboxymethyl cellulose, viscose and viscose and glycerin are used to improve transparency. Can be given.

[0028]

The product according to the present invention is formed into a bag shape and requires flexibility for bending and displacement even after sealing the joint portion as a heat seal except for the seal portion. Melts the low melting point part of the fiber.

After the casing is made into a bag, the dye or flavor can be continuously adhered to the inner surface of the casing in the form of a flat sheet. By appropriately combining the edible film-forming material, it is possible to uniformly and highly efficiently adhere using a coating machine or a printing machine.

Even if the casing is formed with high efficiency using a heat sealer, it has a high burst strength and can withstand the filling of any ham, sausage, etc., because the fusion strength is the surface to which the pigment or flavor is attached. It can be achieved by overlapping the surfaces to be adhered and fusing with a heat sealing device.

In the present invention, the copolyester composite fiber used in the present invention has a strong heat-sealing strength because the core portion is not melted and is adhered only by the sheath portion during heat-sealing. In the envelope sticking method seal, as the tensile strength of the casing paper increases, the heat seal strength also increases. Therefore, the core-sheath structure composite fiber in which the strength of the core portion is maintained even after heat sealing is preferable. Further, since the single fiber strength is as strong as 4.0 to 6.0 g / d, the paper strength is increased.

When heat sealing is carried out by the gluing method, even if 90% of the copolyester conjugate fiber is used, bag breakage occurs at the time of meat filling, and even if the amount of the copolyester conjugate fiber is large, the bag will be broken. The tendency remains. On the other hand, it was found that there is no problem in practical use if the copolyester conjugate fiber is mixed in an amount of 40% or more by the envelope sticking method.

By sealing the heat-sealed portion in the form of a net or a dot in the sealed portion, air permeability can be obtained and a smoke treatment can be performed to prevent white lines. A low pressure meat filling type, for example, when casing an irregular ham, it is necessary to fit the meat and the casing, and the basis weight of the casing paper is 20 to 10 because of the strength to withstand the filling pressure.
80 g / m ² is desirable. When it is 20 g / m ² or less, the fitting property is good, but the bag is easily broken, and when it is 80 g / m ² or more, the fitting property is poor and a space is generated between the ham and the casing.

At present, fibrous casing is made of hemp fiber paper with viscose processed and wet specific burst strength of 4.0 to 5.0. In the present invention, the copolymerized polyester conjugate fiber is 40 to 98%, and the rest is hydrophilic fiber 60 to 2%.
The wet specific burst strength is 5.1 to 8.
3 was obtained. Copolyester composite fiber 10
When the content is 0%, the strength of the wet paper during papermaking is low and it is difficult to form a web. Therefore, it is preferable that the hydrophilic fiber content is 2% or more.

[0035]

As described above in detail, according to the present invention, the inter-fiber adhesion is improved by the copolyester composite fiber without the use of regenerated cellulose, and the heat-sealing method is used for the bag-making process and the filling of foods. It has an effect of preventing the trouble of bag breakage at the time of transportation and at the time of transportation or other handling after the completion of packaging.

Further, there is an effect of preventing fibers from falling off and migrating on the inner surface of the casing due to high pressure filling of the meat product. or,
By the copolyester conjugate fiber, by overlapping and fusing the front surface and the back surface of the end portion of the present invention sheet,
A strong bond is formed, which has the effect of preventing bag breakage problems during high-pressure filling and after packaging is completed.

Further, due to the above effects, it can be applied to various uses, for example, as shown below. Drying materials, insect repellents, oxygen scavengers, freshness-retaining agents, packaging materials for disposable warmers, wrapping paper for kneaded products, wrapping paper for confectionery, wrapping paper for fruits and vegetables, sterilizing paper, oil-paper, vacuum cleaner dust bags, tea Bags, dashi bags, drainage bags, wrapping paper for oil products, tray underlays, castella packaging, meat casings, smoke processing.

[0038]

EXAMPLES The heat-sealable casing of the present invention will be described with reference to examples. (Example 1) Softwood pulp SR 20 °, 10 parts, thickness 2
Using denier and 5 mm long polyethylene terephthalate and 90 parts of copolyester core-sheath structure composite fiber as a raw material, a suction homer heat-treated at an adhesion temperature of the copolyester part of 110 ° C. or higher and dried 45 g / m
^Two mixed papers were obtained.

Then, the dye and flavor are printed on one side by a roll coater, dried and then heat-sealed by a heat sealer so as to form a net by an envelope sticking method × 2 kg / cm ² ×
After heat-sealing for 2.0 seconds and cutting to a predetermined length, only one side is heat-sealed with a heat sealer to form a bag, and meat is filled at a pressure of 1.8 kg / cm ² and then sealed. When smoked, it withstood a high filling pressure and, in a short time, obtained a quality similar to that of smoked ham.

The wet specific burst strength, the wet strength and the heat seal strength of the obtained heat-sealable casing of the present invention were measured and are shown in Tables 1 and 2. As a comparative example, the wet burst strength of a conventional fibrous casing obtained by subjecting a hemp fiber paper to viscose processing is also specified.

[0041]

[Table 1]

[0042]

[Table 2]

In Comparative Example 1, Manila paper 25.0 g /
viscose processed in m ^2, glycerin processing after to 10
0.8 g / m ² (Glycerin adhesion amount 23.4 g / m ² )
In Comparative Example 2, 59.2 g / m ² (glycerin adhesion amount of 14.6) was obtained by viscose processing on 17 g / m ^{2 of} Manila paper.
g / m ² ). (Example 2) Softwood pulp was beaten to SR20 ° with a beater, polyethylene terephthalate having a thickness of 2 denier and a length of 5 mm and a copolyester composite fiber were used as raw materials, and paper was made with a round net paper machine and then with a Yankee dryer. Thirteen
It was heat-treated and dried at 0 ° C. The blending amount was as follows.

1, pulp 10% copolyester composite 90% 2, same as above 20% same as above 80% 3, same as above 30% same as above 70% 4, same as above 40% same as above 60% Paper weight was 40 g / m ^2, papermaking, The heat-sealing strength was compared by the joint sticking method and the envelope sticking method.

As is apparent from FIG. 1, the heat-sealable casing of the present invention has a wet specific burst strength improved by 1.2 to 1.7 times as compared with the conventional viscose processed product of Manila paper, and further as shown in FIG. To provide a heat-sealable casing that can be sufficiently used as a fibrous casing having a high meat filling pressure, because the casing 2 heat-sealed by the envelope sticking method can obtain a high heat-seal strength of 6.0 kg / 15 mm width or more. Became possible.

Next, a comparison between the joint-sticking method and the envelope-sticking method will be described. It was heat-sealed and measured under the heat-sealing conditions of 190 ° C. × 2 Kg / cm ² × 2 seconds.

As shown in FIG. 2, the casing 1 heat-sealed by the palm-stick method is a copolymerized polyester composite fiber 9
Heat seal strength of about 1.5 kg / 15 even when used at 0%
If the width becomes less than or equal to mm and the amount of the copolymerized polyester conjugate fiber is reduced, the heat seal strength is reduced.

In the envelope sticking method, at the time of measurement, the heat-sealed portion is stronger than the tensile strength, and there is paper breakage other than the heat-sealed portion.
When measuring the heat seal strength, it was reinforced from the back side with cellophane tape and measured, 60% of copolyester composite fiber
Even when mixed, a strong heat seal strength of 5 kg / 15 mm width or more was obtained.

The present invention is not limited to the above-mentioned embodiments, but may be arbitrarily modified without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a characteristic diagram showing heat-sealing strength by a palm-sticking method and an envelope-sticking method.

FIG. 2 (a) is a perspective view of a joint-paste method. (B) is a cross-sectional view of the joint-paste method.

FIG. 3A is a perspective view of an envelope sticking method. (B) is a sectional view of the envelope sticking method.

Claims (2)

[Claims] 1. A casing paper comprising a copolyester composite fiber and a hydrophilic fiber. 2. A casing which has heat sealability on both sides and is sealed by an envelope sticking method by mixing or combining a copolyester composite fiber and a hydrophilic fiber.