JPWO2006120785A1 - Packaging method for commercial sheet food - Google Patents

Abstract

In the present invention, a sheet-like food is fed in a horizontal direction while being formed into a cylindrical shape by heat sealing (center sealing) so that the packaging film in the longitudinal direction can be opened without breaking the packaging film at the time of opening by a bag making machine. The business is characterized in that it is supplied continuously one by one into the packaging film and sealed and cut by heat sealing (end sealing) one by one so that the packaging film can be opened without tearing when opening in the transverse direction. This is a method for packaging sheet foods. This invention made it the subject to provide the packaging method of the sheet-like food for business use which is hard to produce foreign materials mixing, such as paper dust, at low cost. [Selection] Figure 1

Description

    The present invention relates to a method for packaging commercial sheet food.

Commercial sheet food products are processed by food ingredients manufacturers and processed into sheets and delivered to food manufacturers, etc., and processed and molded in advance, contributing to labor savings in food manufacturers. Is.
Such materials include a sheet-like water-in-oil emulsion composition (sheet margarine), a sheet-like oil-in-water emulsion composition, a sheet-like flower paste, and a sheet-like chocolate. Sheet margarine is mainly used by rolling into dough in the production of pies, Danish pastries, croissants and the like.

In the sheet margarine, the size of one sheet of margarine is 20 cm to 40 cm on a side, the thickness is about 0.5 cm to several cm, the weight is usually 500 g to 2500 g, and there are also about 10 kg. When this is shipped as a product, in order to prevent adhesion between the respective sheet-like emulsified compositions, about 10 to 20 sheets are laminated with a flexible resin film slightly wider than the sheet sandwiched between sheets. It is widely done in cardboard boxes.
In addition, it is publicly known that Patent Document 1 discloses that a sheet-shaped margarine is packaged in a horizontal pillow, and although such a product has been released quite a while ago, it is necessary to break the packaging. For example, a large food maker who opens more than 10,000 bags forcibly requires harsh opening operations by hand. As a method for facilitating opening, there is a method in which a notch or the like is provided on one side of the bag and tearing it into a tape shape (Patent Document 2). However, if a broken piece of packaging film enters the product, Since it may cause a problem of mixing, it is presumed that it did not spread and settled down to the current method. As another problem, the method as disclosed in Patent Document 1 is disadvantageous for mass processing because the content is squeezed by a meat dividing device, which is disadvantageous for mass processing, and the cut end of the product is not clean.

    When using sheet foods that are currently in widespread use, the cardboard box is opened, the laminated sheet food is taken out together with the film, and the film is peeled off. The paper in the cardboard box is opened before the cardboard box is opened. Powder or the like may adhere to the product from the open end of the sheet end surface, resulting in a problem of foreign matter contamination. In addition, there is a problem that the color changes when the side surface of the sheet-like food is dried.

    In order to solve the above problem, it was considered to use a cardboard box without paper dust, but such a cardboard box is not known and it is easily imagined that even if realized, it will be expensive. The A method of putting several sheet-like foods sandwiched between films one by one into a vinyl bag and then packing it in a cardboard box is also conceivable. However, fragments of the vinyl bag also cause a problem of foreign matter contamination. As described above, the method of pillow-wrapping sheet-like foods one by one by the usual method is not practical. Although it is conceivable to seal the packaging film so that it can be opened without tearing (easy peel), it is necessary to use an expensive multilayer film, which is also not practical. Patent Document 3 discloses a simple openable bag body made of a laminated film in which a base material layer and an easily peelable sealant layer are laminated.

JP 50-95441 A JP 2003-72773 A Japanese Patent Laid-Open No. 11-130145

    This invention made it the subject to provide the packaging method of the sheet-like food for business use which is hard to produce foreign materials mixing, such as paper dust, at low cost.

As a result of diligent research, the inventor has surprisingly made it easy to devise a heat seal by using a relatively inexpensive single-layer film to wrap a sheet of food in a horizontal pillow for each sheet. In addition, the inventors have obtained knowledge that an easy peel can be realized and the problem of foreign matters can be solved, and the present invention has been completed.
That is, according to the present invention, sheet-shaped food is heat-sealed (center-sealed) so that it can be opened without breaking the packaging film when the longitudinal polymerization surface is opened by a bag making machine, and is formed into a cylindrical shape and sent horizontally. The business is characterized in that it is continuously supplied one by one into the packaging film and sealed and cut by heat sealing (end sealing) one by one so that the packaging film can be opened without tearing when opening in the transverse direction. A method for packaging sheet-like foods (claim 1). The method for wrapping commercial sheet food according to claim 1, wherein the packaging film is a polyethylene single layer film. The commercial sheet-like food packaging method according to claim 1 or 2, wherein the center seal and / or the end seal is a heat seal by a heating body having a protrusion and a heating body having a recess or groove. The packaging method for business-use sheet-like food according to claims 1 to 3, wherein the center seal and / or the end seal is stopped by spot-like partial fusion. The method for packaging commercial sheet-like foods according to claim 1, wherein, in the polymerization in the longitudinal direction, a difference is provided in the length from the center seal portion to the end of the packaging film without aligning the ends of the packaging film. ). The packaging method for business-use sheet-like food according to claim 1, wherein the center seal and / or the end seal is partially formed (claim 6). The packaging method according to claims 1 to 6, wherein the sheet food is sheet margarine (claim 7). The method for packaging commercial sheet food according to claim 1, wherein the packaging film is a polyethylene single layer film in which HDPE and LLDPE are mixed.

    According to the packaging method of the present invention, it is possible to prevent foreign matters such as paper dust from adhering to commercial sheet foods. In addition, the method of the present invention can use a widely used horizontal bag making and filling packaging machine, and can reduce the cost of the product because the packaging speed is high and an inexpensive film can be used. It is an excellent one.

    In the present invention, the commercial sheet-like food may be a sheet-like water-in-oil emulsion composition (sheet margarine), a sheet-like oil-in-water emulsion composition, a sheet-like flower paste, or a sheet-like chocolate. It is difficult to apply to liquidity. In the present invention, a sheet-like food is sealed (center-sealed) in a cylindrical shape so that it can be opened without tearing the packaging film when the longitudinal polymerization surface is opened by a horizontal bag making filling and packaging machine (horizontal pillow packaging machine). Continuously supplied one by one into the packaging film that is molded and delivered in the horizontal direction, sealed in the lateral direction (end seal) and sealed so that it can be opened without tearing the packaging film when opened. It is a method for packaging commercial sheet food characterized by cutting.

    Here, it is necessary to seal the center seal and the end seal so that they can be opened without breaking the packaging film at the time of opening. There is a need for a so-called “easy peel” seal. If it is not easy peel, there is a possibility that a film that is torn by opening will be mixed into the product, which does not meet the object of the present invention. In addition, a known method can be applied to the easy peel seal. However, when a multilayer film is used, the seal is perfect, so that the sealing performance of the package is increased, but the material cost is increased and will be described later. However, this causes a problem in the lamination of the packaged product and is not suitable for the purpose of the present invention.

It was found that easy peel sealing can be easily realized by using a single layer film made of polyethylene and devising heat sealing.
That is, the heat seal is a heating element having a ridge and a film or a concave part corresponding to the film that contacts the tip of the ridge by pressing the two films between the corresponding ridge or groove. The temperature, pressurization pressure, and pressurization time of both heating elements are adjusted so that only the film in contact with the film melts and the two films are fused (adhered) to stop the spot-like partial fusion. If it does so, it will become possible to open easily by peeling off adhesion | attachment of two films, without tearing a packaging film (easy peel). The reason is not necessarily clear, but the film portion that contacts the tip of the ridge is slightly thinner than the other portions due to the pressure and heat of the ridge, and the bottom of the corresponding recess is slightly more than the tip. Because of the high temperature, only the film that contacts the tip of the ridge and the film that contacts the corresponding recess does not melt and the two films do not fuse (adhere). The adjustment of the temperature, pressurization pressure, and pressurization time optimal for both of the heating bodies is surprisingly relatively easy when using a single layer film made of polyethylene.
The ridges can be pyramid-shaped with their tips cut off horizontally, or rounded corners, but the corresponding ridges are provided so that each of the ridges meshes with each other. Alternatively, a groove may be provided so that one row of protrusions meshes. In any case, it is preferable that the bottom of the groove or groove be in a shape that comes into contact with the tip of the protrusion when both heating elements are engaged.
The heating element is a set of metal rolls heated by heating means such as a heating wire above the melting temperature of the film to be used (one surface has protrusions and one surface has corresponding recesses or grooves formed. A typical protrusion has a size of 2 mm square and a height of about 0.2 to 0.7 mm, and for example, 5 to 6 rows are provided in a 1 cm width of the roll. It is possible to perform heat sealing by sandwiching two films between them and rolling them in the vertical direction at the center seal and in the horizontal direction at the end seal, and a set of lengths corresponding to the seal length. Heat sealing can also be performed by using a metal plate (projections on one side and depressions on one side) and pressing two films between the metal plates.

    As the film, a single layer film of polyethylene can be used, but a single layer film of HDPE or LLDPE is preferable from the viewpoint that the range of the temperature condition in heat sealing can be increased. A single layer film in which HDPE and LLDPE are mixed is more preferable, and a single layer film having a mixing ratio of 100: 100 to 95: 5, most preferably 85:15 to 95: 5 is more preferable.

    The film thickness is 40 to 80 μm, more preferably 55 to 65 μm. When the thickness is less than 40 μm, the strength of the bag itself is insufficient for easy packaging of commercial sheet-like food, and easy peel becomes difficult. If it exceeds 65 μm, it is not preferable because a streak easily enters the package.

    When the center seal is performed, in the polymerization of the packaging film in the longitudinal direction, the length from the center seal location to the end of the packaging film is provided without aligning the ends of the packaging film, and the inner side is folded by the next end sealing process. The length to the end of the resulting packaging film can be longer or shorter than that on the outside. For example, by providing a difference of about 10 mm, one side is 5 mm from the seal location to the end, and the other is 15 mm, so that when the user opens, this becomes an ear that can be easily picked up, making opening easier. . In addition, it is preferable to use a film that is colored differently from the color of the food that is the content (for example, green when normal sheet margarine is used as the content) in order to confirm the presence or absence of contamination. .

    The center seal and / or the end seal can be partially performed to the extent that there is no hindrance to contamination. For example, in the end seal, several non-sealed portions of about 10 mm can be provided, and if this is the case, the non-sealed portions are kept in close contact with each other, so there is little possibility of contamination. By providing the non-seal portion, it is possible to easily release the air inside the packaging bag to the outside while preventing foreign matter from entering. In particular, the provision of a non-sealed portion in the end seal means that when the packaged commercial sheet food obtained by the method of the present invention is shipped as a product, 10 to 20 sheets are stacked and placed in a box. It is convenient for air to escape from the side.

    Packaging of commercial sheet-like food products obtained as described above can achieve both appropriate sealing strength and easy peelability, can be easily opened without breaking, and paper dust, etc. It is possible to prevent foreign matter from being mixed and is excellent at low cost.

(Example 1)
Hereinafter, the present invention will be described with reference to examples.
LLDPE (100%) A film having a thickness of 60 μm (colorant is kneaded and colored green) is a temperature (center center) shown in Table 1 with a longitudinal polymerization surface in a horizontal pillow packaging machine (bag making machine). A pair of metal rolls heated to a sealing temperature (one surface is provided with 2 rows of squares with a width of 1 cm and a height of about 0.5 mm to fill the surface in 5 rows and the other one The surface of the substrate was heat-sealed using a groove so as to correspond to the protrusions) and formed into a cylindrical shape. In addition, the polymerization did not align the film ends, but was folded by an end seal, and the length to the end of the packaging film that was the inner side was longer by 1 cm than that of the outer side. This is sequentially fed in the horizontal direction, and one sheet of sheet-shaped margarine (300 mm long, 150 mm wide, 450 g, 10 mm thick) prepared by a conventional method is supplied. The transverse direction indicates the temperature (end) Corresponding length of a pair of metal plates heated at the sealing temperature) (projections and grooves similar to metal rolls are formed, but in some places the heating plate contacts the film with a length of about 10 mm. (Several non-sealed portions are provided. The shape of the protruding portion is shown in FIG. 2). By continuously performing the above, sheet-like margarine packaged one by one was obtained. The end seal temperature and center seal temperature were tested at the temperatures shown in Table 1. Both temperatures were optimal at 110 ° C, with adequate seal strength, and can be opened easily without tearing. there were. The results are shown in Table 1. In the heat seal, the film that contacts the tip of the ridge and the film portion that contacts the corresponding recess are fused (adhered), and the spot-like partial fusion is stopped. Twenty sheet-like margarines packaged one by one in this way were stacked and aged in a cardboard box to obtain a product.

Example 2 A test was performed in the same manner as in Example 1 except that the film was changed to HDPE: LLDPE = 1: 1. At a center seal temperature of 120 ° C. and an end seal temperature of 115 ° C., it was possible to achieve both an appropriate seal strength and an easy peel property.

Example 3 A test was conducted in the same manner as in Example 1 except that the film was HDPE: LLDPE = 9: 1. At a center seal temperature of 130 ° C. and an end seal temperature of 120 ° C., it was possible to achieve both an appropriate seal strength and an easy peel property. Although the seal strength is slightly inferior, it is possible to achieve both easy peelability even at a center seal temperature of 125 ° C. and an end seal temperature of 115 ° C., and the allowable temperature range of the seal can be made wider than in the first and second embodiments. It was.

Example 4 A test was conducted in the same manner as in Example 1 except that the film was HDPE (100%). At a center seal temperature of 130 ° C. and an end seal temperature of 120 ° C., it was possible to achieve both an appropriate seal strength and an easy peel property. However, if an excessive force was applied at the time of opening the end seal, the tear may occur, and the allowable temperature range of the seal was narrower than in Examples 1 to 3. Moreover, since the film was hard, wrinkles were likely to enter the bag.

(Comparative Example 1) A film was tested as in Example 1 using a two-layer film of OPP (stretched polypropylene) / LLDPE (thickness is 20/40 μm in order), with the LLDPE surfaces being bonded surfaces. It was. When the sealing temperature is low, the sealing strength is weak, while when the sealing temperature is high, the sealing strength is too high and the film is torn and torn, making it difficult to find an appropriate temperature range.

FIG. 1 is a perspective view schematically showing a sheet-like food obtained by the present invention. FIG. 2 is a perspective view of the ridge.

Explanation of symbols

        1: Center seal, 2: End seal, 3: Sheet food

Claims (8)

    The sheet-like food is heat sealed (center seal) so that it can be opened without breaking the packaging film when the longitudinal polymerization surface is opened by a bag-making machine, and it is fed into the packaging film that is sent in the horizontal direction while being formed into a cylindrical shape. A sheet-like food for business use, which is supplied continuously one by one and sealed and cut by heat sealing (end sealing) one by one so that it can be opened without tearing the packaging film when opening in the transverse direction. Packaging method.     The packaging method for commercial sheet food according to claim 1, wherein the packaging film is a single layer film of polyethylene.     The method for packaging commercial sheet food according to claim 1 or 2, wherein the center seal and / or the end seal is a heat seal by a heating body having a protrusion and a heating body having a corresponding recess or groove.     The packaging method for commercial sheet-like foods according to claim 1, wherein the center seal and / or the end seal is stopped by spot-like partial fusion.     The method for packaging commercial sheet-like food according to claim 1, wherein, in the polymerization in the longitudinal direction, a difference is provided in the length from the center seal portion to the end of the packaging film without aligning the ends of the packaging film.     The method for packaging business-use sheet-like food according to claim 1, wherein the center seal and / or the end seal is partially formed.     The packaging method according to claim 1, wherein the sheet-like food is a sheet-like margarine. 2. The method for packaging commercial sheet food according to claim 1, wherein the packaging film is a polyethylene single layer film in which HDPE and LLDPE are mixed.

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