JP4375830B2 - Package of meat paste products - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a vertical pillow type sealed bag filled with surimi of fish meat or livestock meat such as ham and sausage or sterilized by retort after filling.
[0002]
[Prior art]
Conventionally, meat-filled sealed bags such as ham and sausage have been sterilized by retort after filling and sealing, because it is necessary to completely sterilize until spore bacteria. Furthermore, leaving water droplets or bubbles in the sealed bag induces the growth of spoilage bacteria, so bubbles and free water are eliminated as much as possible, and a tightly sealed bag that can easily maintain an upright state by holding one end. It was sold as. In order to obtain such a sealed bag, the film used should have heat resistance that can withstand retort sterilization conditions, shrinkage that compresses the bag contents during retort sterilization, and air that accelerates deterioration and corruption during storage. It is required to have an air barrier property that can be shut off and a heat-sealing property that facilitates bag making.
[0003]
As a material satisfying such conditions, a polyvinylidene chloride film has been conventionally used. However, since polyvinylidene chloride has a high chlorine content and may generate dioxins during incineration, a packaging film that does not contain chlorine is required. Polyamide containing an aromatic group is preferable as a film material to replace polyvinylidene chloride, but its heat shrinkability is still insufficient.
[0004]
Conventionally, a bag in which both ends of a vertically-bonded elongated bag are ligated with metal wire clips has been used. However, when industrially manufactured continuously, there is a risk that metal pieces such as machine wear pieces may be mixed into the filler, and mixing of metal pieces must be avoided even at a low rate. By using an elongated pillow bag without using a metal wire clip, it becomes possible to use a metal detector and 100% contamination of metal pieces can be eliminated. Furthermore, the method of using a metal wire clip bundles both ends of a tubular film and presses it with a clip to tighten and ligate it. As a result, many fine wrinkles are formed and vacuoles tend to be generated between the wrinkles. There was a problem with the sealing performance. According to the method of heat-sealing both ends, there is no fear of wrinkles at both ends, and the sealing performance is improved.
[0005]
The thermal shrinkage rate of a commercially available polyamide film containing an aromatic group as a bag material is not yet sufficient. When a heat-fusible layer is further laminated on the film, the thermal shrinkage rate is further reduced. When the heat-fusible layer is laminated only on one side, not on both sides of the base polyamide film, it is possible to reduce the decrease in the heat shrinkage rate. When a heat-fusible layer is provided only on one side, the inner surfaces of the laminated film are fused together as a vertical fusing method. A pillow bag is used, which is formed by horizontally fusing parts, and so-called envelope tension, in which the other edge of the film is overlapped with one edge of the film and the inner and outer surfaces of the laminated film are fused, cannot be used. .
[0006]
[Problems to be solved by the invention]
However, when a pillow bag is manufactured using a film having a heat-fusible layer only on one surface of the heat-shrinkable base material layer, a package as shown in FIG. 1 is obtained. 1 is a vertical fusion part, 2 is a horizontal fusion part, and the front-end | tip part 3 of a vertical fusion part is thick in FIG. FIG. 2 is an enlarged perspective view of the vertical fusion part 1. When heat-sealing with a vertical heat sealer, the part of the edge of the film that is not heat-sealed is also heated, the outer heat-shrinkable base film shrinks, and the inner heat-fusible film does not shrink The film is curled outward at the front end portion 3 of the vertical fused portion and rounded into a small spiral.
[0007]
As shown in FIG. 3, when the horizontal heat sealer 6 is used for horizontal fusion, the portion A other than the vertical fusion part is sufficient if two films of the bag back surface 4 and the bag surface 5 are fused, In the vertical fusion part C, two films 4 and 5 are fused in a state where a total of four films 1, 4, and 5, which are vertically fused, are overlapped. This is usually done in the manufacture of pillow bags, but at the tip B of the vertical fusion part, if the tip is double-wrapped, such as B, the thickness is equivalent to five films. However, since both ends of the film are rounded, the thickness is 10 times as much as that of 10 films. Further, when the normal vertical fusion bonded part and the front and back film 4 and 5 of the bag are combined, the two films 4 and 5 are fused in a state where the films having a total thickness of 12 sheets are overlapped. In the case of triple winding, 7 × 2 + 2 = 16 sheets of film are fused in the same manner.
[0008]
Because part B is extremely thick compared to part A and part C, the 4 and 5 films located at the boundary between part B and part A and the part between part B and part C are due to steps due to the difference in film thickness. The pressure and temperature of the horizontal heat sealer 6 are difficult to be applied and incomplete fusion occurs. That is, a portion 7 that tends to be incompletely fused in black in FIG. 4 is generated. The presence of an incompletely fused part causes liquid leakage and rot. When fused with high heat and high pressure so as not to cause an incompletely fused part, the films 4 and 5 in the A part and the C part are overfused, and the film is cut between the fused part and the non-fused part There is a fear.
[0009]
The present invention does not perform ligation by metal, does not use a chlorine-containing film material, fills and seals a meat paste in a long and narrow pillow bag, seals, and provides a meat paste product that is sterilized by retort. The purpose is to provide a technology that enables reliable horizontal fusion.
[0010]
[Means for Solving the Problems]
An object of the present invention is to solve the above-mentioned problems, and has a configuration in which an elongated bag filled with a meat paste product, sealed, and sterilized, having a vertical fusion part on one side and having both sides fused laterally. The film used is a laminated film in which a heat-fusible layer is applied only on one surface of a heat-shrinkable film based on polyamide, and the laminated film is formed at 120 ° C. for 30 minutes. Using a film having a heat shrinkage rate of 5% or more, preferably 10% or more when heated , and having a heat-fusible layer only on one side of the heat-shrinkable film substrate, the length of the film It is characterized in that the edge lines in the length direction coincide with each other, and the vertical fused portion is fused over the entire width.
[0011]
That is, when manufacturing a sealed package of a pillow bag type meat paste product using a heat-shrinkable, air-blocking, heat-resistant film having a heat-fusible layer only on one side, and retort sterilization, The fusion part is surely fused to the end part. For this purpose, the two ends of the film are made to coincide with each other with a hot plate wider than the vertical fusion part. As a result, there is no film that is not fused outwardly of the longitudinal fusion part, and there is no risk of curling and incomplete transverse fusion. The fused film becomes a film having a symmetrical laminated structure that cancels out different directions of warping and stress, and is flattened and not rounded.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The meat paste product in the present invention is ham or sausage, and the raw material may be livestock meat or fish meat. Since these foods are easily spoiled, they are subjected to retort sterilization after sealing at about 120 ° C. for 30 minutes.
[0013]
The packaging bag uses a so-called pillow bag that is obtained by fusing both ends in the length direction of the film into a cylindrical shape, and fusing both ends so that the fusing part is on one side. To do.
[0014]
In the present invention, it is necessary to fuse the vertical fusion part of the pillow bag over the entire width. “Over the entire width” means that the film is fused to the edge line in the length direction of the film. When the film is formed into a cylindrical shape, both end edge lines may become uneven, but in the present invention, both end edge lines need to coincide. When both edges line is irregular, it remained without being fused the one edge becomes thicker rounded this film tends cause leaving incomplete fusion site during the horizontal fusion . In the present invention, “completely coincide” means that even if one of the films remaining without being fused is curled, it is coincident with the extent that it is not folded and formed into a thick portion at the time of transverse fusion.
[0015]
In the case of a laminated film in which one is heat-shrinkable and the other is not heat-shrinkable, the vertical fusion part is generally not fused across the entire width. The reason for this is that in reality the lengthwise edge lines of the film do not completely coincide and some deviation occurs, and in this case, when a single film is heated with a vertical sealer, the heat-fusible layer is This is to avoid troubles adhering to the heating surface of the vertical sealer. The present invention dares to fuse over the entire width, and also matches the both end edge lines of the film in the above sense.
[0016]
[Means for Solving the Problems]
As heat-shrinkable films having high heat resistance and high barrier properties, polyvinylidene chloride films and the like have been preferably used conventionally. Recently, polyamide-based films have been used as heat-shrinkable and air-blocking film materials that do not contain chlorine. In particular, polyamides containing aromatic groups are preferred materials, and are used in the form of polymer blends, coextrusions or copolymerizations with ordinary non-aromatic polyamides such as 6 nylon, 6, 6 nylon, etc. Polymer blends are preferred because of the ease of controlling the balance of heat resistance, heat shrinkability and mechanical properties. As the polyamide having an aromatic group, a polymer commonly called MXD nylon is widely used, which is a polymer of metaxylenediamine and adipic acid.
[0017]
As the heat-fusible layer, a known heat-fusible film or polymer such as polypropylene, linear low-density polyethylene or a modified product thereof is used.
[0018]
The film used in the present invention has a heat-sealable film laminated on only one side, heat resistance enough to withstand heat sterilization at 120 ° C., and 5% or more, preferably 10% or more after 120 ° C. × 30 minutes treatment Any film having a shrinkage rate and oxygen barrier property may be used, and a film having such characteristics is formed and used. Since the heat-fusible layer is not heat-shrinkable, the heat-shrinkability of the entire film is lowered when the thickness of the heat-fusible layer is increased. A large heat shrinkability is preferable in order to give the product a long-term tension and eliminate the possibility of external contamination. When the heat-fusible layer is laminated on both sides, the ratio of the thickness of the heat-shrinkable film to the whole film is lowered, and the heat shrinkage rate of the whole film is lowered. A heat-shrinkable layer was laminated.
[0019]
Further, the contact 9 between the horizontal fusion part and the fold line 8 of the bag forms an acute angle and is the portion that is most easily broken, and the portion that is likely to break through another package. As shown in FIG. 1, when the horizontal fusion part is not set to have the same width as shown in FIG. 4, but the end of the side of the horizontal fusion part in contact with the bag body is wide and the central part is narrowed, so-called R seal shape. In addition, the contact 9 between the side fold line 8 of the bag and the horizontal fusion part becomes an obtuse angle, and the ease of tearing and the ease of tearing can be improved.
[0020]
Easy opening processing such as notches and fine scratches can also be performed on both edge portions of the film used in the present invention.
[0021]
【Example】
Example 1
MXD6 nylon _{# 15} and CPP _{# 40} were bonded together using a polyester urethane adhesive to obtain a laminated film of MXD6 nylon _{# 15} // CPP _{# 40} . MXD6 nylon is a nylon obtained by polymer blending MXD nylon and 6 nylon. CPP is an abbreviation for stretched polypropylene, and the number written in reduced letters after that is the thickness of the film expressed in μm. When # is added in front of the reduced number, it means that the film is supplied.
[0022]
When this film was heat-treated at 120 ° C. for 30 minutes in a freely contracted state, the shrinkage was 12% in the vertical direction and 10% in the horizontal direction.
[0023]
The above laminated film slitted to a width of 90 mm in a vertical pillow type automatic bag making and filling machine with a squeezing roll is melted using a heat plate wider than the film width of 5 mm in the vertical fusion part with the heat fusion layer inside. I wore it. In the vertical fusion, consideration was given so that the edge lines of the film coincided.
[0024]
A sausage pillow-type sealed bag of sticky sausage with a length of 220 mm filled with 90 g of surimi was prepared by continuously supplying separately prepared surimi for fish sausage and eliminating bubbles as much as possible.
[0025]
In the horizontal fusion, as shown in FIG. 1, when the horizontal fusion part 2 is in contact with the side fold line 8, it is formed into an arc shape toward the film body.
[0026]
This sealed bag was sterilized by heating at 120 to 123 ° C. for 30 minutes. Although 400 bags were heated, there was no abnormal package after the heat treatment, and the sealed bag was a stick-type sausage with a length of 205 mm with the film contracted and stretched. 300 sausage packages were left in a room at room temperature of 25 ° C. for 3 months, but no abnormal bags such as rot were found.
Example 2
MXD6 nylon _{# 15} and CPP _{# 17} were bonded together via an acid-modified polypropylene resin having a thickness of 20 μm extruded from a T die to obtain a laminated film of MXD6 nylon _{# 15} / PP ₂₀ / CPP _{# 17} . When this film was heat-treated at 120 ° C. for 30 minutes in a freely contracted state, the shrinkage ratio was 14% in the vertical direction and 13% in the horizontal direction.
[0027]
This film was slit to a width of 90 mm, and a stick-shaped sausage pillow-type sealed bag having a length of 150 mm filled with 50 g of surimi was continuously produced in the same manner as in Example 1.
[0028]
This sealed bag was sterilized by heating at 120 to 123 ° C. for 30 minutes. Although 400 bags were heated, there was no abnormal packaging after the heat treatment, and the sealed bag was a stick-type sausage with a length of 135 mm with a contracted film. The 300 sausage packages were left in a room at room temperature of 25 ° C. for 3 months, but no abnormal bags such as rot were found.
Example 3
MXD6 by extrusion laminating a polypropylene having a thickness of 20μm and 15μm in twice from a T-die onto a nylon _{# 15,} to obtain a laminated film of Nylon-MXD6 _# 15 / _{PP 35.} When this film was heat-treated at 120 ° C. for 30 minutes in a freely contracted state, the shrinkage was 13% in the vertical direction and 11% in the horizontal direction.
[0029]
A pillow-type sealed bag of stick-shaped sausage with a length of 220 mm filled with 90 g of surimi similar to that in Example 1 was obtained.
[0030]
This sealed bag was sterilized by heating at 120 to 123 ° C. for 30 minutes. Although 400 bags were heated, there was no abnormal packaging after the heat treatment, and the sealed bag was a stick-type sausage with a length of 200 mm that contracted and stretched. 300 bags of this sausage package were left in a room at room temperature of 25 ° C. for 3 months, but no bags with abnormalities such as rot were found.
Comparative Example 1
For comparison, a sausage packaging bag is manufactured using the same material and film as in Example 1 and Example 2 except that the non-fused portion of about 2 mm is left outside the vertical fused portion, and the vertical fusion is performed. did. Each of these 300 packaging bags was sterilized by heating at 120 to 123 ° C. for 30 minutes.
[0031]
In the package after the heat treatment, the non-fused portion outside the vertical fused portion is curled toward the outside of the film and curled into a small spiral shape, and about 5% of each package is B in FIG. The contents leaked due to sealing leakage at the horizontal fusion part at the boundary between part A and part A or part B and part C. In addition, about 20% of the contents did not leak, but the above-mentioned horizontal fusion part was retracted.
[0032]
【The invention's effect】
The present invention has succeeded in producing a pillow-type sealed package for retort packaging of meat paste products without leaking, using a heat-shrinkable film having a heat-fusible layer only on one side.
[Brief description of the drawings]
FIG. 1 is a perspective view of a package manufactured by a conventional technique.
FIG. 2 is an enlarged perspective view of a vertical fusion part in FIG. 1;
FIG. 3 is an enlarged explanatory view when the bag of FIG. 1 is horizontally fused.
4 is a plan view showing the vicinity of a horizontal fusion part of a bag obtained by the method of FIG. 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vertical fusion | fusion part 2 Horizontal fusion part 3 The front-end | tip part of a vertical fusion part 4 Bag back surface 5 Bag surface 6 Horizontal heat sealer 7 The part which tends to be incomplete fusion 8 Side fold line 9 Contact point A Two sheet fusion part B Four sheet fusion part D Multiple sheet fusion part

Claims (1)

In an elongated pillow bag filled with a meat paste product, sealed and sterilized, which has a vertical fusion part on one side and is fused at both ends,
The film used is a laminated film in which a heat-fusible layer is applied only on one side of a heat-shrinkable film based on polyamide containing an aromatic group. The heat shrinkage rate when heated at 30 ° C. for 30 minutes is 5% or more,
A package for a meat paste product, characterized in that the longitudinal fused portions are fused over the entire width with the edges in the longitudinal direction of the film being coincident .

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