JP7212959B2 - Filled package for solids-containing packaged material - Google Patents

Description

The present invention includes, for example, spices such as pepper, cereal particles such as sesame, liquids and viscous substances including solids such as fruit pulp and peel, vegetables and meat, solids having fluidity such as paste, etc. in a packaging bag made of a laminated plastic film with a contaminant seal. The present invention relates to a filling package for a solid content-containing package that is free from defects.

Patent Documents 1 and 2 describe a vertical pillow type filling and packaging machine that automatically fills a packaging bag made of a laminated plastic film with a liquid to be packaged and performs vertical and horizontal heat sealing for packaging. Filling and packaging machines such as the following are well known.

The filling and packaging machines disclosed in these documents, for example, continuously run a long packaging film made of a laminated plastic film comprising a base layer and a sealant layer from top to bottom along the longitudinal direction. , the film is folded in half in the width direction so that the sealant layers face each other, and the overlapping both side edges of the film are continuously heat-sealed in the vertical direction by vertical seal rolls to form a vertical seal portion, and the film is A pair of horizontal seal rolls extending along the width direction of the packaging film (seal A blade) is used to squeeze out the package and form horizontal seal portions at predetermined intervals (generally referred to as "contaminant seal") so that packages can be manufactured continuously.

JP-A-8-301237 JP 2006-248578 A

In the filling and packaging machine, the so-called "contaminant sealing" method, that is, the packaging film is sandwiched by a pair of horizontal sealing rolls, and the rotation of the horizontal sealing rolls squeezes out the packaged material remaining between the packaging films. Since a method of forming a laterally sealed portion at the squeezed-out position is employed, the item to be packaged is inevitably interposed in the laterally sealed portion. As a result, some of the items to be packaged (solids) remain in the side-sealed portion and become more likely to be bitten. However, there is a problem that the solid matter is caught inside the lateral seal portion, and the fusion bonding at the biting position is hindered, and peeling is likely to occur, eventually causing liquid leakage (slow leak). . Therefore, the filling and packaging machine using the foreign matter sealing method has conventionally been suitably used for filling liquid products such as seasoning liquids such as soy sauce and sauces that do not contain solids. It was considered unsuitable for filling and packaging of dressings containing such ingredients and filling and packaging of retort foods such as curries and stews.

In addition, it is desired that packaged items containing citrus fruits, such as ponzu (citrus soy sauce), retain the fragrance of the citrus fruits for a long period of time. Limonene, which is a scent component of citrus fruits, is abundant in the peel, so it is preferable to fill and package the raw peel together with the liquid in the packaging bag, but since the peel and pulp contain a lot of water, If it is filled in its raw state, mold may develop over time, so conventionally, it was filled with only fruit juice or after drying the peel and the like.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a plastic packaging bag for an object to be packaged consisting of liquids containing solids such as pepper, sesame seeds, pericarp, etc., fluids such as viscous substances, solids with fluidity, and semi-solids. A filling package that is filled and packaged by a foreign matter sealing method has a lateral sealing portion that does not cause sealing failure (liquid leakage) such as peeling, and in particular, the solid-containing packaged item is a food or drink. The object of the present invention is to propose a filling package for an object to be packaged containing solids, which can suppress the growth of fungi, bacteria, etc. derived from the solids remaining in the laterally sealed portions in such cases.

As a result of intensive studies to achieve the above object, the inventors have conceived of the present invention according to the gist and configuration described below.
That is, the present invention provides a packaging bag formed by stacking laminated plastic films each having a base layer and a sealant layer so that the sealant layers face each other, and sealing the solids inside the packaging bag. A package in which the contained packaged material is filled by a foreign matter sealing treatment with a pair of horizontal sealing rolls,
In the horizontal seal portion formed by the contaminant sealing treatment by the horizontal seal roll, the sealant layer is composed of a sealant first layer (A1) and a sealant having a lower melting point than the sealant first layer (A1) from the base layer side. The sealant first layer (A1) and the sealant second layer (A2) are composed of at least two layers of two layers (A2), and the sealant first layer (A1) and the sealant second layer (A2) are mainly composed of polyolefin resin. The solids are pulverized, and the sealant second layer ( A2) is a filling package for a solid-containing package, characterized by comprising a pulverized and impregnated layer impregnated with the resin of A2).

In the filling package of this solid-containing object to be packaged,
(1) the sealant first layer (A1) and the sealant second layer (A2) are mainly composed of polyethylene or polypropylene ;
(2) the secondary component of the sealant first layer (A1) is made of low density polyethylene or medium density polyethylene;
(3) the secondary component of the sealant second layer (A2) is composed of an ethylene-ethyl acrylate copolymer, an ethylene-vinyl acetate copolymer or an ethylene-acrylic acid copolymer;
is the preferred solution.

According to the present invention, an object to be packaged consisting of a fluid containing solid matter, a fluid solid matter, or a semi-solid matter that is continuously filled in a bag made of a cylindrical plastic film after being longitudinally sealed. , While squeezing (extracting) with a pair of horizontal seal rolls, by a foreign matter sealing process in which the squeezed position is horizontally sealed, the laminated plastic film at the horizontally sealed position is pressed to push out the packaged object, and the packaged object is pushed out. If there is a solid that can be pulverized (crushed) inside, the solid in the package remaining at the lateral seal position is pulverized, and at the same time, the cracks and cracks of the pulverized solid A pulverization impregnation (impregnation) process is performed in which the gaps between the solids are impregnated (impregnated) with the sealant layer resin of the laminated plastic film softened and melted by heating with the horizontal seal rolls. For this reason, the solid matter remaining in the lateral seal portion is impregnated (impregnated) or surrounded by the melted sealant layer resin in an island-like scattered state, and is melted together with the sealant layer resin of the laminated plastic film. Since the lateral seal portion is formed by bonding, the fusion bonding of the lateral seal portion is not hindered by the solid matter, and sealing failure (liquid leakage) is caused due to the occurrence of gaps and peeling. There is no such thing.

Further, according to the present invention, the sealant layer constituting the laminated plastic film is composed of at least two layers, the sealant first layer (A1) and the sealant second layer (A2) from the base layer side, and the sealant first layer By laminating such that the ratio of the thickness t _A1 of (A1) and the thickness t _A2 of the sealant second layer (A2) is 0.10≦t _A2 /t _A1 ≦0.75, the lateral seal Even if the sealing pressure by the rolls is as high as 500 kPa or more, the laminated plastic film does not break, and the solid matter contained in the package can be pulverized. Therefore, even if the solids are, for example, fibrous substances such as the endocarp of citrus fruits such as lemons and oranges, funnels and the like, meat, fish, etc., they can be pulverized into small pieces. In particular, the pulverization and impregnation treatment is to pulverize the size of the solid matter remaining at the lateral sealing position in the thickness direction to small pieces equal to or less than the total thickness of the sealant layer that faces and is fused and joined to the laminated laminated plastic film. According to this, there is no risk of causing a sealing failure due to the solid matter getting caught, and the sealing strength of the lateral sealing portion can be increased. Therefore, according to the present invention, contaminant seals can be applied to retort foods containing solids such as meat, fish, and vegetables, powders and grains such as pepper and salt, and fluid solids such as potato salad. A package filled and packaged in a packaging bag can be obtained by the method.

Further, according to the present invention, the laminated plastic film is strongly pressed at 500 kPa or more by the horizontal sealing rolls as described above, and the horizontal heat sealing speed by the horizontal sealing rolls is set to the horizontal heat by the horizontal sealing rolls in the conventional filling packaging machine. By reducing the sealing speed (12 to 18 m/min) to a lower speed (10 m/min or less, more preferably 2 to 6 m/min or less), heat is generated during horizontal sealing, and the heat generation raises the sealing temperature of the horizontal sealing rolls. You can now set it lower than before. Therefore, it is possible to widen the range of options for the plastic film to be used and widen the range of heat sealing conditions.

In addition, according to the present invention, as described above, gaps and peeling do not occur in the horizontal seal portion. Even if residual moisture remains, softening of the laminated plastic film and impregnation with molten resin do not leak out to the end face of the lateral seal portion, and the growth of microorganisms on the end face of the lateral seal portion is suppressed, resulting in packaging. It can reduce the risk of body contamination.

Furthermore, according to the present invention, when the item to be packaged is liquid or viscous, the packaging bag made of the laminated plastic film is provided with a film-like pouring nozzle having a self-sealing function. Even after the start, it is possible to prevent outside air from entering the bag from the pouring nozzle, and to effectively suppress the growth of aerobic bacteria in the bag. In addition, when the object to be packed consists of a food or drink, the pH of the object to be packaged should be adjusted to less than 4.0, or the object to be packaged should be heated to 70° C. or higher before being filled into the packaging bag. By packaging (hot packing), the growth of microorganisms in the sealed bag can be suppressed, and the risk of contamination of the packaged items in the bag can be further reduced.

It is a schematic diagram showing an example of a vertical filling and packaging machine. FIG. 4 is an enlarged side view of a pair of first horizontal seal rolls used in the contaminant sealing process; FIG. 4 is a cross-sectional view of a lateral seal portion formed by a conventional method; 1 is a cross-sectional view of a laminated plastic film that constitutes the filling package of the present invention; FIG. It is a mimetic diagram explaining pulverization impregnation processing of the present invention. Fig. 3 is a cross-sectional view of a laterally sealed portion of the filling package of the present invention; 1 is a partial perspective view showing an embodiment of a seal blade for a first horizontal seal roll used in the contaminant sealing process of the present invention; FIG. It is a figure which shows one Embodiment of the filling package of this invention. FIG. 4 is a photograph showing a comparison of sealing surfaces of (a) a lateral seal portion of an example and (b) a lateral seal portion of a comparative example; FIG. 4 is a photograph showing a comparison of tomographic photographs of (a) a laterally sealed portion of an example and (b) a laterally sealed portion of a comparative example; FIG.

An embodiment of the present invention will be described below with reference to the drawings.
The filling packaging body of the present invention is a filling packaging machine such as various vertical pillow type filling packaging machines and vertical pillow type multi-row filling packaging machines that use foreign matter sealing that heat seals while continuously filling the object to be packaged. can be formed by In this case, a vertical filling and packaging machine 1 shown in FIG. 1 is used to continuously fill and package a liquid material containing a solid material such as pepper or sesame as a material to be packaged to produce a three-side or four-side sealed package W. will be described as a representative example. Items to be packaged include grain particles such as pepper and sesame, liquids and viscous items including solids such as meat, fish, fruits, and vegetables, as well as powders and grains such as pepper and salt, and liquids. Various products such as food and drink such as solids and semi-solids (paste etc.), chemicals, pharmaceuticals and the like can be used.

For example, the filling and packaging machine 1 for a three-sided seal bag continuously feeds out from a film roll R a laminated plastic film F comprising a long base layer 20 and a sealant layer 21, which travels from above and below. While traveling continuously, the laminated plastic film F is folded back in the width direction while being guided by the guide rod 2 so that the sealant layers 21 face each other, and the left end of the laminated plastic film F in the figure , and the overlapped side ends are continuously pressed and heated in the longitudinal direction (longitudinal direction) of the laminated plastic film F by a pair of vertical sealing rolls 3. , the sealant layers 21 are fusion-bonded to each other to form the longitudinal seal portion 4, thereby forming the laminated plastic film F into a tubular shape.

Next, the material to be packaged M supplied via a pump or other supply route is formed into a cylindrical laminated plastic material by a filling nozzle 5 penetrating between a pair of vertical seal rolls 3 from above to below. The inside of the film F is continuously filled. Thereafter, the laminated plastic film F formed in a cylindrical shape after filling is sandwiched by a pair of first horizontal seal rolls 6a and 6b arranged at regular intervals in the longitudinal direction, and is heated and pressurized over the entire width. Then, the sealant layers facing each other are welded to each other to form lateral seal portions 7 at predetermined intervals. Thereafter, the lateral seal portion 7 is sandwiched between a pair of second lateral seal rolls 8a and 8b and pressurized again to ensure the sealing, thereby connecting many packages W in the longitudinal direction of the laminated plastic film F. The bag is continuously made in the state of As shown in the figure, the package W is cut at the center position of the laterally sealed portion 7 by a cutting mechanism 12 provided downstream of the second laterally sealed roll 8, so that the package W is divided into individual bags or a plurality of bags. good too.

Here, as shown in the enlarged side view of FIG. 2, the pair of first horizontal seal rolls 6a and 6b are arranged parallel to each other and are configured to rotate in opposite directions. Each of the first horizontal seal rolls 6a and 6b has a built-in heater (not shown) and seal blades 9 extending in the axial direction at equal intervals in the circumferential direction. Although four sealing blades 9 are provided on each of the first horizontal sealing rolls 6a and 6b in the figure, the number of the sealing blades 9 can be appropriately changed according to packaging conditions such as the sealing pitch and filling speed. be able to.

The pair of first horizontal seal rolls 6a, 6b are synchronously driven to rotate, and based on this, the facing seal blades 9 are brought into contact with each other to form a tubular lamination that travels between the first horizontal seal rolls 6a, 6b. While sandwiching the plastic film F, the sealant layers 21 located on the inner surface side of the laminated plastic film F (mutually facing each other) are fusion-bonded by heating and pressing the relevant position, thereby forming the lateral seal portion 7. be done.

Here, as the horizontal sealing rolls 6a and 6b rotate, the sealing blades 9 come into contact with each other, thereby squeezing out the item to be packaged M filled in the cylindrical laminated plastic film F. The sealant layers 21 of the laminated plastic film F facing each other are heated and pressurized by the seal blade 9 to be fusion-bonded to form the lateral seal portion 7 as described above. A portion of the solid matter S such as pepper or sesame seeds is not pushed out, and as shown in the cross-sectional view of the lateral seal portion 7 in FIG. It may remain in the part 7 while being bitten.

If the solid matter S remains in the laterally sealed portion 7 in this manner, an unfused portion 11 is generated in the laterally sealed portion 7 to form a gap, and the unfused portion 11 serves as a passageway for the package W. There is a risk that the material M filled inside will leak out, and the thickness of the horizontal seal portion 7 at the position where the solid material S remains will increase, causing wrinkles on the surface of the horizontal seal portion 7 and causing slow leaks. , there was a problem that the appearance also deteriorated.

Therefore, in the present invention, the above problem is overcome by adopting the pulverization impregnation treatment method described below. The pulverization impregnation treatment method will be described below.
In forming the lateral seal portion 7 by the contaminant sealing method, as a preferred embodiment of the present invention, the sealant layer 21 of the laminated plastic film F, as shown in FIG. A1) and a sealant second layer (A2), and the laminated plastic film F is sandwiched by contact between seal blades 9 provided on each of the pair of first horizontal seal rolls 6a and 6b. By pressing, the solid matter S remaining at the lateral sealing position is strongly pressed while being sandwiched between the resin of the sealant layer 21, particularly between the facing sealant second layers (A2).

By this pressurization, as shown in the schematic diagram of FIG. The gap between the objects S is impregnated (penetrated) with the resin of the sealant layer 21 of the laminated plastic film F softened and melted by the heat and pressure of the sealing blade 9 (especially the resin of the facing sealant second layer (A2)). A so-called pulverization impregnation treatment is performed.

By performing such pulverization and impregnation treatment, the solids S in the liquid are finely pulverized by heating and pressurization, and dispersed in the softened-melted sealant resin 21' as shown in FIG. The lateral seal portion 7 is formed in a state in which the sealant resin 21' is integrated with the sealant resin 21' by fusion bonding. As a result, the solid matter S remaining in the lateral seal portion 7 does not form an unfused portion 11 (gap) as in the conventional art, and the occurrence of seal failure (liquid leakage) is also prevented. can be done.

Both the sealant first layer (A1) and the sealant second layer (A2) constituting the sealant layer 21 are mainly made of polyolefin resin such as polyethylene and polypropylene, and the thickness of the sealant first layer (A1) The ratio of t _A1 to the thickness t _A2 of the sealant second layer (A2) is configured to be 0.10≦t _A2 /t _A1 ≦0.75. This is because the thickness of the sealant first layer (A1) is relatively increased with respect to the sealant second layer (A2) whose strength is sacrificed in order to sandwich the solid S when the pulverization impregnation treatment is performed. By increasing the size (thickness), the necessary strength required for the sealant layer 21 can be maintained. On the other hand, even if the sealing pressure by the pair of first horizontal sealing rolls 6a and 6b is set to a high pressure as described below for the pulverization and impregnation treatment of the solid matter S, the laminated plastic film F may be broken. is eliminated, and the pulverization impregnation treatment can be preferably performed.

In the pulverization and impregnation treatment, the pressure of each of the pair of first horizontal seal rolls 6a and 6b is 500 kPa or more, preferably 3 times or more and 10 times or less than the pressure of a general horizontal seal roll provided in a filling packaging machine. A high pressure of 500 to 2000 kPa, more preferably 600 kPa to 1500 kPa is used. Thus, in the present invention, by setting the pressure of the first horizontal seal rolls 6a and 6b to a high pressure, the solid matter S is a fibrous material such as a vegetable or fruit sac that is difficult to squeeze out by the sealing method. can be effectively squeezed out and finely pulverized, and can be pulverized and impregnated.

Further, in the pulverization and impregnation treatment, the solid matter S remaining at the lateral sealing position is pulverized by the pair of first horizontal seal rolls 6a and 6b, and the solid matter S after pulverization has a size in the thickness direction and is overlapped. Less than the total thickness of the sealant layers 21 (total thickness of the two sealant layers 21) of the combined laminated plastic film that are fusion-bonded to each other, preferably 100 μm or less, more preferably 50 μm or less, even more preferably A small piece with many cracks having a size of about 5 to 30 μm is formed. As a result, even in the portion where the solid matter S remains, the solid matter S is dispersed and impregnated in the softened-melted sealant resin 21', and the thickness of the lateral seal portion 7 does not increase. Also, since the solid matter S is so small that it cannot be visually confirmed, the appearance of the lateral seal portion 7 can be improved. It should be noted that when the thickness of the solid S becomes larger than the total thickness of the two sealant layers 21, the thickness of the portion of the lateral seal portion 7 where the solid S remains is larger than that of the other portion, and the lateral seal portion 7 Undesirably, unevenness is formed on the surface and residual solids S can be visually confirmed.

Furthermore, the pair of first horizontal sealing rolls 6a and 6b is used under strong pressure as described above, and the horizontal heat sealing speed is lower than before (10 m / min or less, more preferably 2 m / min to 6 m / min). As a result, the articles to be packaged M remaining at the laterally sealed position can be effectively squeezed out, and the amount of solid matter S remaining in the laterally sealed portion 7 can be minimized. Moreover, as described above, the pulverization and impregnation treatment does not cause gaps or peeling that may become passages in the lateral seal portion 7, and the solid matter S remaining in the lateral seal portion 7 is softened and melted. Since the solid matter S is impregnated or surrounded by the sealant resin 21', even if the solid matter S is positioned on the end surface of the package W, the occurrence of mold and the growth of microorganisms on the end surface can be suppressed. can reduce the risk of contamination of
Further, according to the pulverization and impregnation treatment of the present invention, as described above, the pair of first horizontal sealing rolls 6a and 6b heat-seal the laminated plastic film at the horizontal sealing position at a high pressure at a low speed, thereby Heat is generated mainly due to pulverization of solid matter at the 1 lateral seal portion. As a result, the heat-sealing temperature can be set to a lower temperature than before, and the pulverization impregnation process becomes more effective.

In the laminated plastic film F used for performing the pulverization impregnation treatment of the present invention, the sealant layer 21 is composed of at least two layers, the sealant first layer (A1) and the sealant second layer (A2), as described above. Therefore, the total thickness t _A of the sealant layer 21 is preferably 15 to 150 μm, more preferably 20 to 100 μm, still more preferably 25 to 75 μm. This is because if the total thickness t _A is less than 15 μm, the horizontal seal portion 7 may not be able to obtain sufficient bag-breaking strength when the solid matter contained in the package is crushed and impregnated as described above. On the other hand, if the thickness exceeds 150 μm, although the strength increases, there is a problem of an increase in cost. This is because a tensile stress is applied and there is a risk of breakage.

The sealant first layer (A1) and the sealant second layer (A2) are described in detail below.
First, the sealant first layer (A1) constituting the sealant layer 21 is mainly composed of polyolefin resin, and has a thickness t _A1 of preferably 12 to 140 μm, more preferably 15 to 70 μm. This is because if the thickness t _A1 of the sealant first layer (A1) is less than the lower limit, the lateral seal portion 7 may not be able to obtain sufficient bag breaking strength when the package W is heat-sealed. If the upper limit is exceeded, the cost increases, and when the laminated plastic film F is folded to form a package W, excessive tensile stress is applied to the outer base layer 20 at the folded ends, which may cause breakage. be.

The polyolefin resin, which is the main component of the sealant first layer (A1), is preferably made of polyethylene or polypropylene. A case where the sealant first layer (A1) is made of polyethylene will be described below as a representative example, but the present invention is not limited to this.
Polyethylene, which is the main component of the sealant first layer (A1), has a density of 0.925 g/cm ³ or more, more preferably 0.925 to 0.940 g/cm ³ . If the density is too high, the film becomes brittle, and there is concern about the occurrence of pinholes. Further, as the polyethylene, linear polyethylene using a single site catalyst (e.g., metallocene catalyst) is preferable. Examples include Evolue (registered trademark) SP3010 and Nipolon (registered trademark) HF250K manufactured by Tosoh. By using a linear polyethylene using a single-site catalyst, it is possible to obtain a laminated film for packaging that is excellent in tensile strength and has a firmness, and is excellent in heat resistance and cold resistance. Here, "mainly" means exceeding 50% by mass of the sealant first layer (A1).

The main components of the sealant first layer (A1) have a melting peak temperature (Tm1) determined by differential scanning calorimetry (DSC) of 120°C or higher, and a melting peak full width at half maximum (Fw1) of 1.5°C. The following polyethylene is preferred. Here, as an apparatus used for differential scanning calorimetry, a differential scanning calorimeter "DSC1" manufactured by METTLER TOLEDO is exemplified. The fact that the full width at half maximum (Fw1) of the melting peak measured by DSC is in a narrow range of 1.5 ° C. or less indicates that the copolymer has a narrow range of molecular weight distribution and, for example, linear polyethylene. It is thought that this indicates that there is little variation in the molecular structure, such as The sealant first layer (A1) is heated at a higher temperature than the sealant second layer (A2) by the pair of first horizontal seal rolls 6a and 6b (from the base layer 20 side by the first horizontal seal rolls 6a and 6b). Because it is heated, the sealant first layer (A1) closer to the base layer 20 is heated to a higher temperature than the sealant second layer (A2)), so even when the sealant second layer (A2) melts, the sealant Polyethylene having a relatively high melting point is used so that the first layer (A1) does not melt. In addition, it is necessary to control the full width at half maximum of the DSC peak to be narrow and to control the molecular weight distribution of polyethylene to be narrow. The primary component of the sealant first layer (A1) is more preferably polyethylene having Tm1 in the range of 120 to 140°C and Fw1 in the range of 1.0 to 1.5°C.

By configuring the sealant first layer (A1) as described above, when sealing contaminants, it is possible to select a wide operating speed without causing sealing failure due to foaming up to a higher temperature range than conventional products. can.

The secondary component of the sealant first layer (A1) is preferably low density polyethylene (LDPE) or medium density polyethylene (MDPE). Furthermore, linear polyethylene using a single-site catalyst (for example, a metallocene catalyst) is more preferred. In addition, in order not to impair the above functions of the main constituents, the density is set in the range of 0.915 to 0.940 g/cm ³ and the melting peak temperature (Tm1) obtained by DSC is in the range of 115 to 140 ° C., Its full width at half maximum (Fw1) is preferably 1.5° C. or less. The total composition in the sealant first layer (A1) of the subsidiary components is less than 50% by weight, preferably 35% by weight or less.

As a secondary component of the sealant first layer (A1), an ionomer (IO) or the like may be included. It may also contain a stress adjuster that relaxes the stress between the laminated film layers.

The polyolefin resin, which is the main component of the sealant second layer (A2), preferably consists of polyethylene or polypropylene. A representative example of the case where the sealant second layer (A2) is made of polyethylene will be described below, but the present invention is not limited to this.

The thickness t _A2 of the sealant second layer (A2) is in the range of 3 to 15 μm. If the thickness t _A2 is less than the lower limit, the pulverization and impregnation treatment cannot be performed by the pair of first horizontal seal rolls 6a and 6b. On the other hand, if the upper limit is exceeded, the resin pool in the melted sealant layer 21 becomes thick and tensile stress is applied, which may cause breakage.

The sealant second layer (A2) preferably uses low-density polyethylene (LDPE) or ultra-low-density polyethylene (VLDPE) having a density of 0.915 g/cm ³ or less as a main component, softens at the lateral seal portion 7, It is possible to remove melted contaminants and pulverize and impregnate solids remaining in the horizontal seal part 7, and as a layer that directly contacts the packaged item, it has cold resistance, water resistance, and chemical resistance to inorganic solvents. Excels in toughness, impact resistance, and moldability. For example, linear polyethylene using a single-site catalyst (e.g., metallocene catalyst) or polyethylene using a multi-site catalyst (Ziegler catalyst) can be used, such as Tosoh's Nipolon (registered trademark) HF210K and HF213K exemplified. Here, "mainly" means exceeding 50% by mass of the sealant second layer (A2). Preferably, the density ranges from 0.890 to 0.915 g/cm ³ .

The sealant second layer (A2) has a melting peak temperature (Tm2) determined by DSC in the range of 95 to 105 ° C., and a full width at half maximum (Fw2) in the range of 8 to 15 ° C. Low density polyethylene (LDPE) or very low density polyethylene (VLDPE). As a result, the sealant second layer (A2) of the sealant layers 21 is first melted and moved by the heat and pressure applied by the seal bar 7 in the method for sealing foreign matter, and the desired effect is exhibited.

As a secondary component of the sealant second layer (A2), ethylene-ethyl acrylate copolymer (EEA), ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), etc. can be used. The composition of the subsidiary components of the sealant second layer (A2) is preferably 20% by mass or less, more preferably 10% by mass or less. It may also contain a stress adjuster that relaxes the stress between the laminated film layers.

The base layer 20 can be composed of uniaxially or biaxially oriented polyester (PET), nylon resin (NY), ethylene-vinyl alcohol copolymer (EVOH), or the like, but is not limited thereto. , can be selected as appropriate.

In addition, the laminated plastic film F used in the present invention is optionally provided between the base layer 20 and the sealant first layer (A1) by depositing an aluminum foil, an aluminum alloy foil, metal aluminum or a vapor deposition layer of an oxide thereof. , a metal or metal oxide layer such as a silica deposited layer, an intermediate layer made of a resin layer such as ethylene vinyl alcohol copolymer (EVOH) with high gas barrier properties and water vapor barrier properties, etc. can be laminated, Such a laminated plastic film F is a film constituting a pouch for retort food (having a heat-sealable resin layer made of olefin resin such as polypropylene and polyethylene on the food side and a gas barrier such as polyester and polyamide on the outside). It is suitable as a laminated film formed by providing a layer made of a highly flexible resin, aluminum foil, or the like.

Examples of the method for producing the laminated plastic film F include a dry lamination method, an extrusion lamination method, a co-extrusion method, etc. Preferably, the base layer 20 and the sealant first layer (A1) are adhered by a dry lamination method. The first sealant layer (A1) and the second sealant layer (A2) are laminated by an extrusion lamination method, particularly preferably an inflation method.

In addition, in the present invention, as shown in FIG. 7, on the surface of the seal blade 9 provided on at least one of the pair of first horizontal seal rolls 6a and 6b, a seal extending in the axial direction of the first horizontal seal rolls 6a and 6b Preferably, one or more grooves 10 are provided. According to this, since the surface of the seal blade 9 is narrowly divided in the rotational direction through the groove 10, the clamping force (pressing force) is greater than that of the seal blade without the groove 10. This makes it possible to effectively squeeze out the object to be packaged M, effectively carry out the pulverization and impregnation treatment of the solid matter S remaining at the laterally sealed position, and increase the sealing strength of the laterally sealed portion 7. can also be increased.

The maximum depth of the groove 10 is 300 μm or less, preferably 30 μm or more and 200 μm or less, more preferably 40 μm or more and 160 μm or less, which is the total thickness or less of the laminated plastic films F that are heat-sealed by the contact of the seal blades 9 . As described below, according to this, the overlapping laminated plastic films F can be firmly sandwiched from the front and back sides at the groove 10 portion and heated and pressurized, so that the above effects can be further enhanced.

In the above embodiment, a three-side seal type package W was described as an example, but the package W can be of various types such as a four-side seal type, a back-stick type, and the like.

In addition, when the item to be packaged M is liquid or viscous, as shown in FIG. A film-like dispensing nozzle 15 having a non-return function may be provided so as to protrude from the edge 14). In this case, it is possible to prevent outside air from entering the package W even after the start of use. Therefore, it is possible to suppress the intrusion of bacteria and dust into the bag and the growth of aerobic bacteria such as mold in the bag.

The film-like pouring nozzle 15 having a non-return function is made of a plastic laminated film having at least a base layer and sealant layers laminated on both sides of the base layer. A pouring passage is defined in the central portion by heat-sealing the peripheral edge portion except for the base end portion in a state of being superimposed on the front and back.

In addition, the non-return function of the film-shaped dispensing nozzle 15 is to dispense the article to be packaged M from the package W without inhaling external air by tilting the package W or pressing the package W. When the package W returns to its standing position or when the pouring is stopped due to the release of the pressure on the package W, the package W is exposed to the negative pressure caused by the reduced pressure atmosphere, and the pouring passage of the pouring nozzle is exposed to the negative pressure. A self-sealing mechanism in which the inner surfaces are immediately in close contact with each other under the interposition of a thin film of the object to be packaged M (flowed from the package W) adhering to the inner surface of the dispensing passage, thereby preventing outside air from entering the package W. It's about function.

When the object to be packaged M is food or drink, it is preferable to set the pH of the object to be packaged M to less than 4.0 in order to suppress the growth of microorganisms in the package W. This is because the pH value at which microorganisms related to the preservation of food and drink can grow differs depending on the type of microorganism, and the growth of general bacteria, Escherichia coli, and lactic acid bacteria can be suppressed by setting the pH to less than 4.0. .

Furthermore, it is preferable to fill and package the packaging material M in the packaging bag W in a state of being heated to 70° C. or higher (hot pack). According to this, various microorganisms related to the preservation of food and drink can be sterilized. : pH: 2.0, killing temperature 70 ° C.) and yeast (acidic growth limit: pH: 3.0, killing temperature 60 ° C.). Contamination risk can be further reduced.

Therefore, it is necessary to provide the film-shaped dispensing nozzle 15 in the package W, adjust the pH of the object M to be filled, and heat the object M to 70° C. or higher for filling and packaging. By making various selections according to the object to be packaged M, the growth of microorganisms in the package W can be effectively suppressed even if, for example, fruits and vegetables are filled in raw form by the filling and packaging method of the present invention. and can be stored for a longer period of time than before.

(Example 1)
In this example, when a foreign matter seal-filling is carried out for a packaged object made of a liquid containing solids, a horizontal seal portion (example) formed by pulverization and impregnation treatment using the high-pressure horizontal seal roll of the present invention. , a lateral seal portion (comparative example) formed by a conventional method was evaluated.
As the liquid material, liquid: squeezed lemon juice and solid material: finely chopped funnel membrane, endocarp, etc., which remain after squeeze of lemon, were used. Other conditions were as follows.
Packaging bag size: Bag width 100 mm x length 300 mm
Film configuration of packaging film: PET 12 µm/nylon 15 µm/PE 60 µm
Seal blade: Width 35mm Flat Heat seal temperature: 125°C
Horizontal seal roll pressure: (Example) left/right = 1200/1200 kPa
(Comparative example) Left/right = 300/300 kPa
Horizontal seal roll peripheral speed: 4m/min

FIG. 9 is a photograph showing a comparison of the seal surfaces of (a) the lateral seal portion of the example and (b) the lateral seal portion of the comparative example.
In the lateral seal portion of the example, it was not visually confirmed that solid matter was caught. On the other hand, in the lateral seal portion of the comparative example, large entrapment was visually confirmed at multiple locations, and some of these were entrapped by long fibrous solids.
As a result, in the package of the comparative example, the solids could not be sufficiently pulverized, and the long diameter was caught in the horizontal seal portion, creating a gap or the like, and there was a risk of liquid leakage due to poor sealing. In the packages of Examples, it was confirmed that the solid matter was finely pulverized and impregnated by applying a high pressure to the horizontal sealing rolls, and a good sealing state was obtained.

Further, while the lateral seal portion of the comparative example had a seal strength of about 45 N/width of 15 mm, the lateral seal portion of the example achieved a high seal strength of 50 to 60 N/width of 15 mm or more.

Furthermore, FIG. 10 shows a tomographic photograph of the lateral seal portion.
In the horizontal seal portion of the embodiment shown in FIG. 10(a), the solid matter is pulverized and impregnated, and the thickness of the portions where the solid matter remains increases by only about 5 μm, and no unevenness is observed on the surface of the horizontal seal portion. I couldn't.
On the other hand, in the horizontal seal portion of the comparative example shown in FIG. , it can be seen that there is a high possibility that the portion becomes a passage and the liquid substance leaks out.

(Example 2)
Food and drink packages are required to reduce the risk of microbial contamination. In general, the presence or absence of fungi can be considered as a measure of the spoilage of food and drink, and the presence or absence of water such as free water and bound water is important for the growth of food and drink, in addition to nutrients and pH. Therefore, in this embodiment, when the foreign matter seal filling of the object to be packaged consisting of a liquid material containing solids is carried out, the horizontal seal portion (embodiment ) and a laterally sealed portion (comparative example) formed by a conventional method, fungi were applied to the film end faces, cultured, and whether or not the fungi grew on the film end faces was evaluated over time.

Each condition was as follows.
Liquid: water + sesame Size of packaging bag: bag width 100 mm x length 300 mm
Film configuration of packaging film: PET 12 µm/nylon 15 µm/PE 60 µm
Seal blade: Width 35mm flat Heat seal temperature: 125°C
Horizontal seal roll pressure: (Example) left/right = 1200/1200 kPa
(Comparative example) Left/right = 300/300 kPa
Horizontal seal roll peripheral speed: 4m/min

As a test method, an evaluation sample piece (10 mm × 10 mm, number of samples: N = 3) is cut out from the lateral seal part of the manufactured package, and a small amount of mold (black mold: Cladosporium cladosporioides) is applied to the end face of each sample piece, It was placed on a plate medium (potato dextrose agar medium) and cultured at 25°C for 2 weeks.

As a result, on the sample piece of the comparative example, the formation of mold was confirmed on the 7th day, and on the 2nd week, it was confirmed that the mold had spread greatly in a circular shape from the end surface of the sample piece. It is thought that this is the result of mold growth caused by solid matter and moisture remaining in the sample piece (lateral seal portion), liquid leaking out from the gaps formed by the residual solid matter, etc. to the end face. be done.

On the other hand, in the sample piece of Example, no mold was observed even after 2 weeks had passed. This is done so that the solid matter and water remaining in the horizontal seal portion after the pulverization and impregnation treatment are impregnated with a melted sealant resin (PE), and are firmly sealed in the horizontal seal portion in a dispersed state to form passages in the horizontal seal portion. It is presumed that there was no gap or the like, and no moisture leaked out to the end face of the sample piece (laterally sealed portion), so that mold did not proliferate. From this example, it was confirmed that the pulverization and impregnation treatment of the present invention can reduce the risk of mold contamination of the package.

The filling and packaging method of the present invention for filling and packaging a solid-containing package into a plastic packaging bag includes not only liquid, viscous, and fluid solids containing solids, but also adhesion that does not contain solids. It can also be suitably used for filling and packaging substances with high viscosity and low fluidity such as agents and silicone resins.

1 filling and packaging machine 2 guide rod 3 vertical seal roll 4 vertical seal portion 5 filling nozzles 6a, 6b first horizontal seal roll 7 horizontal seal portions 8a, 8b second horizontal seal roll 9 seal blade 10 groove 11 non-fused portion 12 Cutting mechanism 13 Packaging bag main body 14 Upper edge 15 Film-like dispensing nozzle 20 Base layer 21 Sealant layer 21' Sealant resin A1 Sealant first layer A2 Sealant second layer R Film roll F Laminated plastic film S Solid matter

Claims (4)

An object containing a solid substance is placed in a packaging bag formed by stacking laminated plastic films each having a base layer and a sealant layer so that the sealant layers face each other, and sealing them vertically and horizontally. , A package filled by a foreign matter sealing process with a pair of horizontal seal rolls,
In the horizontal seal portion formed by the contaminant sealing treatment by the horizontal seal roll, the sealant layer is composed of a sealant first layer (A1) and a sealant having a lower melting point than the sealant first layer (A1) from the base layer side. The sealant first layer (A1) and the sealant second layer (A2) are composed of at least two layers of two layers (A2), and the sealant first layer (A1) and the sealant second layer (A2) are mainly composed of polyolefin resin. The solids are pulverized, and the sealant second layer ( A filled package for a solid content-containing package, comprising a pulverized and impregnated layer impregnated with the resin of A2) . 2. Fill packaging of a solid-containing package according to claim 1, characterized in that the sealant first layer (A1) and the sealant second layer (A2) are mainly composed of polyethylene or polypropylene. body. 3. The filling package for solids-containing objects to be packaged according to claim 2, wherein the secondary component of the sealant first layer (A1) is made of low-density polyethylene or medium-density polyethylene. The secondary component of the sealant second layer (A2) is composed of an ethylene-ethyl acrylate copolymer, an ethylene-vinyl acetate copolymer or an ethylene-acrylic acid copolymer. 4. A filled package of the solid content-containing package according to Item 2 or 3.

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