JP7048006B2 - Perforated film packaging for opening - Google Patents

Description

The present invention relates to a perforated film package for opening, particularly a film package having perforations with improved openability.

Conventionally, in a bag or box made of materials such as film or paper, a laminated body in which household tissue paper (tissue paper or toilet paper), paper towels, kitchen paper, various wipers, etc. are alternately folded is stored, and the contents are stored. When using the laminate, the required amount is appropriately pulled out from the opening and used. In packaging made from a film or the like that wraps and protects the laminate, which is the content, forms such as pillow packaging, gusseted gusset packaging, and combined packaging (caramel packaging) are generally used. The opening is often perforated so that it can be easily opened.

When taking out the contents from the package made from the above-mentioned film or the like, once the opening of the perforation is broken, then one set is taken out, but when the perforation is broken, the perforation strength is strong and it is difficult to open. Or, it may destroy a part of the contents by applying strong force to open it. In addition, when the perforations are broken with a strong force, the film parts other than the perforations are broken and unnecessarily cleaved, resulting in insufficient protection of the contents and deterioration of the appearance. Problems such as many contents coming out of the package at one time occur. Further, with perforations that are easy to open, there is a high risk that the perforations will break due to a slight impact during transportation or storage, resulting in a problem of reducing the commercial value.

Japanese Unexamined Patent Publication No. 2008-183034 Japanese Unexamined Patent Publication No. 2016-188092

The present invention has been made in consideration of problems in opening a film package having perforations for opening, and is not easily opened during transportation or storage, and it is necessary to take out the contents. Further, it is an object of the present invention to provide a film package having perforations for opening, which can be easily opened with perforations for opening and whose portion other than the perforations is difficult to tear.

In order to solve the above problems, the present invention can be achieved by the following contents.

(1) A row of perforations for opening connected in a row in a film package, which is a sheet laminate of sanitary paper in which the contents of a film package packaged with a flexible film base material can be taken out one set at a time. The strength (maximum point load) of the perforated portion in any of the opening perforation rows of the opening perforation row is 1.0 N / cm or more and 4.6 N / cm or less. The strength (maximum point load) of the portion of the film other than the perforations of the film having a certain easy-opening portion and perpendicular to the perforation row direction is 5.0 N / cm or more, 8.0 N / cm or less, and the maximum. It is characterized in that the point elongation is 14% or less.

(2) The flexible film base material of the above (1) is characterized in that it is mainly composed of any one of a polyethylene resin, a polypropylene resin, and a polyethylene terephthalate resin.

(3) The contents of the film package of (1) above are a sheet laminate of sanitary paper that can be taken out one set at a time in a pop-up manner, and the sanitary paper is tissue paper, toilet paper, paper towel, kitchen paper, various wipers, etc. Is selected from.

According to the present invention, the package cannot be easily opened during transportation or storage, and when the contents need to be taken out, the package can be easily opened with the opening perforation without easily tearing the film portion other than the perforation. It is possible to provide a perforated film package for opening in which the contents can be stably taken out.

Film package with perforations for opening 1 Explanatory drawing about sampling for measurement of perforation strength and film strength in film package 1. Overall view of the perforated film package 2 for opening and explanatory view for sampling for measuring perforation strength and film strength. Enlarged view of perforations for opening Appearance of the sheet taken out of the film package Sectional drawing in the direction perpendicular to the perforation of the film package of FIG. Enlarged view of Y-shaped perforation and opening start position display Image of setting the film on the measuring part of the tensile tester and measuring

Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be specifically described with reference to the drawings.

A first embodiment of a perforated film package for opening according to the present invention will be specifically described with reference to FIGS. 1, 2, and 4 to 7. FIG. 1 shows an example of a combined wrapping (caramel wrapping), and the opening perforated film package 1 shown in FIG. 1 is packaged with a flexible film A (reference numeral 1) and has contents. Temporary binding perforations are added to the film for taking out objects, and an opening start position display (reference numeral 4) with the apex of the triangle facing each other is displayed near the center of the perforation sequence (reference numeral 2), and the film is displayed. Both ends of the sewing machine are folded and closed. Although it is not always necessary to display the opening start position display, the convenience of the user is improved by displaying the easy-opening portion having the perforation strength of claim 1. In FIG. 1, the number of perforations for opening (reference numeral 2) is one, but it can be provided on the opposite surface (bottom surface) or the side surface if necessary. The perforation portion (reference numeral 3) in the central portion section is the opening start position portion, and is generally approximately the central portion of the perforation row for opening (reference numeral 2). When it is misaligned, or when the direction of taking out the film package from the cardboard case is constant and it is practically preferable to deviate the opening from the center, that is, when the position held by hand is deviated from the center. It is also possible to shift the opening from the central part of the perforation. In such a case, it is preferable to move the display such as the opening start position display according to the easy-opening portion. In addition, the easy-opening portion may be provided at a plurality of places in one perforation row, and in that case, it is preferable to display the opening start position display at a plurality of places corresponding to the easy-opening place.

The perforation strength other than the opening start position portion may be the same as that of the opening portion, but the perforation strength may be changed from the opening start position portion to be stronger or weaker. If a part with stronger perforation strength than the opening start position part is made in the perforation row (reference numeral 2), that part becomes difficult to open (perforation is difficult to open), and it is not opened vigorously and abnormal film tearing occurs. Can be prevented. Further, by making a plurality of parts that are easy to open (open) in the perforation row, the entire perforation can be easily and cleanly opened without abnormal film tearing. On the contrary, if a portion having a weaker perforation strength than the opening start position portion is created in the perforation row, a wide range of perforations can be easily opened at the time of opening, which is effective when priority is given to easy opening.

FIG. 2 shows the sampling position and direction of the sample for measuring the film strength and the perforation strength of the film, and the part of reference numeral 5 shows the sampling position and the direction when measuring the strength of the film. The samples were collected in strips in the direction orthogonal to the perforation sequence. Reference numeral 6 indicates the sampling position and direction of the sample when measuring the perforation strength of the film, and the strip-shaped sample was collected so as to be orthogonal to the center of the perforation and the strength was measured.

FIG. 4 shows an enlarged view of the perforations, in which the black line portion of the broken line is the cut portion (reference numeral 7) and the blank portion is the tie portion (reference numeral 8). For the cut portion ratio of the perforation (hereinafter referred to as the cut portion ratio), the average value of the cut portion and the tie portion of a specific section of the perforation is measured, and the average value of the cut portion is used as the average value of the cut portion and the tie portion average value is used. It is indicated by the value divided by the added value. It is also possible to adjust the perforation strength of the film by changing the cut portion ratio using the same film, and it is also possible to adjust the perforation strength by changing the strength of the film itself. The strength of the film varies depending on the film material, film thickness, inorganic pigments such as calcium carbonate, talc, silica, etc., and the amount of additives such as various compounds, but in the present invention, the film properties within the range described in claim 1. The film is not particularly limited as long as it satisfies (strength, thickness, elongation, etc.).

As for the perforation shape, a general broken line shape (FIG. 4) is exemplified as a typical example, but a Y-shape (reference numeral 12 in FIG. 7) or a V-shape having the direction of opening when the perforation is opened is illustrated. Perforations such as the shape may be used. In this case, by making perforations symmetrically around the opening start position portion (Fig. 7), the risk of the film breaking from the perforations at the time of opening is reduced. .. The perforations with directionality are not limited to Y-shaped or V-shaped, but are not limited to Y-shaped or V-shaped, but are shaped using curves such as a Y-shaped deformed stab shape or one side of Y-shaped line symmetry. Can also be used.

FIG. 5 is a view in which the perforations for opening are opened and the sanitary paper is taken out, and FIG. 6 is a cross-sectional view in a direction perpendicular to the perforation direction in FIG. 5, and one set of sanitary paper is inside the package. It shows the state of being enclosed in a superposed form so that they can be taken out one by one in a pop-up manner. If it is not necessary to make a pop-up type such as a pocket tissue, sanitary paper may be simply stacked and enclosed.

To briefly explain the method for manufacturing a pop-up laminate, the tissue paper contained in a carton box or the like is generally cut into a rectangular shape and folded in half, and the sheets are folded in an alternately facing manner. On the opening side, about half of the rear part of the front sheet and about half of the front part of the rear sheet are contained and held. In multi-folder production, the required number of sheet rolls cut to a predetermined width are lined up, and they are fed in the flow direction of the sheet to form a continuous laminated body that is folded into an alternately stacked state. To. By cutting this into a predetermined length, a pop-up type laminate can be made. Further, a pop-up type laminated body can be made even by using an interfolder type processing machine for making a pop-up type laminated body by folding the sheets supplied from the two rolls while alternately cutting them. In addition, a compact laminate such as a pocket tissue, which is not a pop-up type, can be made by using a processing machine that cuts and stacks sheets while folding them.

As the film base material constituting the package, polyethylene (PE) resin, polypropylene (PP) resin, polyethylene terephthalate (PET) resin and the like are suitable, but they are flexible and suitable for storage and protection of the packaged object. Any resin film can be used. If necessary, these films may be laminated, or modified by resin coating on the surface, metal vapor deposition, or the like. Further, a pigment such as calcium carbonate may be added to the resin in order to enhance the concealing property of the contents, and the concealing property may be enhanced by printing or the visibility may be enhanced.

The thickness of the flexible film used for the package (JIS P 8118: 2014 measurement) is preferably in the range of 20 μm to 80 μm, more preferably in the range of 25 μm to 60 μm. If it is less than 20 μm, the film strength is generally low, and troubles such as breakage and perforation are likely to occur during perforation processing and heat fusion processing. Further, if it exceeds 80 μm, the film cost becomes high and it is not practical. In addition, the merit of flexibility when the film is used disappears due to the decrease in flexibility, and the processing defect due to the decrease in thermal conductivity at the time of heat fusion etc. Is prone to problems and is not practical. Further, when the inner laminated body (sanitary paper sheet) is sequentially taken out from the package, the bulk of the laminated body becomes low, and the height of the opened portion is lowered accordingly, so that the easy taking out can be maintained and the taking out is in progress. There are merits such as no drop of the sheet into the package, but a decrease in the flexibility of the film is not preferable because it becomes a factor that impairs those characteristics.

The sanitary paper of the present invention refers to household thin paper (tissue paper or toilet paper), paper towels, kitchen paper, various wipers, etc., and wood pulp is generally used as a raw material for these, but various vegetable fibers and used paper are used. Sheets such as pulp, sheets in which various types of pulp and synthetic fibers are mixed, and non-woven sheets can be used, and if necessary, these sheets are used by stacking a large number of sheets (many plies) or embossing them. As these sheets, sheets in which about 2 to 4 sheets are stacked are often used, but the number is not particularly limited to 4 sheets or less. Further, as these sheets, a functional sheet containing a moisturizer, a sterilizing / sterilizing agent, a surfactant, a fragrance, a lubricant, etc. may be used, and this package should be packaged with various sheets as contents. Can be done.

The general dimensions of the sanitary paper that composes the laminate are that it is used for taking it out by hand, wiping it, wrapping it, etc., so its size is about 60 mm to 250 mm on a side without folding. In many cases. Therefore, it is preferable that the length of the perforation for opening is also in the range of 60 mm to 250 mm. If the length of the opening perforation is longer than the width when the sheet is taken out from the opening, problems such as multiple sets of sheets coming out at once and the front part of the next sheet not coming out of the package are likely to occur. Become. On the contrary, if it is excessively narrow, the problem that the sheet cannot be easily taken out or the sheet is broken in the middle is likely to occur.

The opening start position portion (easy-opening portion) in the opening perforation row is preferably in the range of about 20 mm to 100 mm, but is not limited to this, and the length between both ends of the opening perforation, the film material, and the thickness. It is preferable to select the length according to the above. Further, the function of easy opening is achieved by providing one easy-opening portion near the center of the perforation row, but if necessary, a plurality of easy-opening portions may be provided.

As a method of making perforations for opening the film, there are a method of making a perforation by applying a metal perforation blade and a method of locally heating the film using a high-power light source such as a laser beam to make a cut portion. .. When laser light is used, it is possible to easily make a complete cut portion or a thinned portion of the film by changing the amount of heat applied to the film by adjusting the output. In this method, the film may not have a cut portion. In the case of such a perforation making method using laser light or the like, a pseudo perforation is formed by using a portion where the film is heated and thinned as a pseudo cut portion and a portion which is not heated as a tie portion. Is good.

The perforation strength and the film strength of the portion other than the perforation according to claim 1 were measured using a tester capable of measuring the tensile strength and elongation of a sheet such as paper or film. As shown on the left side of FIG. 8, the measurement sample is a test piece cut into strips with a width of 20 mm in the perforation row direction and along the direction perpendicular to the perforation, and the gripping interval at the start of the test (clamp in FIG. 8). The distance between A and the clamp B) was set to 50 mm, and a tensile test was performed after fixing the strip with a clamp so that the perforations were located at the center of the grip interval and did not slip on both ends of the strip. The tensile speed of the tester was set to 100 mm / min, and the measurement was performed from the perforation to the break of the film. In the measurement of the perforation strength, the measured value broken from the part other than the perforation was excluded because the film may be scratched or abnormal when grasped by the clamp, and the measurement results of 10 times were averaged and used as the measured value. On the other hand, in the measurement of film strength, as in the case of perforation strength measurement, a sample cut into strips with a width of 20 mm so as not to include perforations in the direction orthogonal to the perforation sequence was used, and the gripping interval was set to 50 mm. The measurement was carried out with a tensile speed of 100 mm / min. Except for the case where the film was broken from the portion in contact with the clamp, the measurement results of 10 times were averaged and used as the measured value. As the film is stretched, it generally cannot withstand stress, undergoes plastic deformation, and finally breaks. In the process, the maximum point load indicates the maximum tensile strength, and the value was taken as the film strength or the perforation strength of the film. These measured values were standardized to a width of 10 mm (1 cm) and evaluated. If the width of the sample to be measured is narrower than 20 mm, the measurement may be performed with the sample having the maximum measurable width and standardized to a width of 10 mm.

The maximum point elongation is expressed as a percentage by dividing the amount of film elongation under the maximum point load by the grip interval of 50 mm. It is shown that the larger the maximum point elongation is, the larger the elongation deformation when the film is pulled, and even if the maximum point load value is small, if the maximum point elongation is large, the sharpness of the perforations of the film tends to deteriorate. show. Generally, the larger the degree of stretching of the film, the lower the maximum point elongation tends to be. In the case of films showing the same perforation strength but different maximum point elongation, the film with the larger maximum point elongation tends to be. However, the stretchability of the film tends to impair the openability of the perforations. On the other hand, in the case of a film having a low maximum point load value, the film tends to be abnormally cleaved at the perforated end, and as a method of preventing abnormal film cleaving, the shape of the perforated end is J-shaped or U-shaped. There is also a method of distributing stress by making it into a round shape, a method of attaching a seal to the end, and a method of applying an adhesive to reinforce it.

Even in the same film, it is possible to adjust the maximum point load by changing the length (ratio) of the tie part and the cut part of the opening perforation, and the ratio of the length of this tie part and the cut part is It is desirable to adjust appropriately depending on the material and thickness of the film, additives, etc., and the perforation specifications are not particularly limited, but the length of the tie portion of the perforation for opening is practically 0.3 mm or more and 5 mm or less. Is preferable. If it is less than 0.3 mm, the perforations are easily cleaved, and if it exceeds 5 mm, it becomes difficult to open and the perforations do not function. The length of the cut portion of the perforation for opening is preferably 1 mm or more and 10 mm or less. If it is less than 1 mm, stable machining cannot be performed in perforation machining using a sewing machine blade, laser light, or the like, and problems are likely to occur. Further, if it exceeds 10 mm, the film is easily broken, which is not suitable for transportation and storage, and also causes a problem that foreign matter such as dust easily enters during storage due to the large perforated opening. The range of the portion having the perforation strength shown in claim 1 is not particularly limited, but if it is 10 mm or more, there is no problem, and it is preferably 15 mm or more. If the perforation strength portion is 10 mm or more, the package can be easily opened even if the portion slightly deviated from the opening start position display indicating the portion is pressed with a finger to open the package.

FIG. 3 which is the second embodiment is an example of a pillow packaging form packaged with the flexible film B (reference numeral 11), and the pillow packaging is often used for pocket tissues and the like, and in this embodiment, the pillow packaging is compact. Since it is necessary to make a perforation, the perforation to be put in the package is also shortened, and the perforation length is generally about 100 mm or less. When the length of the perforation is about 100 mm or less, it is preferable that the perforation portion is about 40 mm or less to facilitate opening, and the function is achieved at one place near the center of the perforation row, but it is necessary. In such a case, a plurality of easy-opening portions may be provided. In addition, when the thickness of the laminated body to be packaged increases, it is preferable to use a gusset with a gusset. Applicable as appropriate.

As shown in Tables 1 to 4 below, as a film package, the package form, film base material, and film thickness are changed, and the perforated specifications of the easy-open part (opening start position part) and other parts are prepared. It was prepared and evaluated. As for the perforations of the combined wrapping body, as an example, the perforation specifications of the easily opened part were set to 40 mm width at the center of the perforation row, and 20 mm width of the perforations was sampled and a tensile test was carried out. As for the perforations of the pillow package, the width of 30 mm at the center of the perforation row was set as the perforation specification of the opening start position, and the width of 20 mm was sampled and the tensile test was carried out in the same manner as the combined package.

In the evaluation of the perforation openness of the easily opened portion, five evaluators opened each of the two packages and evaluated the ease of opening each package and the presence or absence of abnormal perforation opening after opening. Perforation openability is selected as good or bad, and it is good when all 5 evaluators judge that it is easy to open (◎), it can be used when 4 people make it easy to open (○), and 2 or more are bad. When it was set to, it was marked as defective (x). In the evaluation of perforation openness, the package is held so that the perforations of the package are lined up vertically in front of the evaluator, and the package is left and right at a distance of 15 mm from the perforation at the opening start position of the package. The center of the thumb was placed, and it was evaluated whether or not the package was easily opened when the package was opened by applying force. Regarding the possibility of perforation of the film package when unpacking the exterior film, etc. and taking out the film package, or when manufacturing, packing, transporting, etc., the film package in which a bundle of sanitary paper is wrapped in the film. Using the above-mentioned method for evaluating perforation openness, evaluation was performed by placing the centers of the left and right thumbs at a distance of 30 mm from the perforation and opening the package. When two or more of the five evaluators evaluated that the package was easy to open, the possibility of perforation opening abnormality at the time of unpacking was high (×), and when one or less, the possibility of abnormality was small (○). In the evaluation of these two items, those without x were evaluated as usable.

As shown in Table 1, in Examples 2 to 7 and Reference Example 1, the film base material is a polyethylene (PE) film, and a film having a thickness changed in the range of 20 to 80 μm is used, and the perforated row length is 180 mm. Then, the perforated section of the easily opened part was set to 40 mm, and the perforated physical properties shown in the table were processed, and 150 sets of 2-ply tissue paper (size when folded in half 198 mm x 103 mm) were enclosed inside the package. A package with a combined wrapping specification (top size: about 200 mm × about 105 mm, height: about 50 mm) was produced. As a result of evaluating these packages by the above-mentioned evaluation method, good or usable results were obtained. These packages were within the perforation strength range described in claim 1, had good perforation opening properties, and had no abnormal cleavage.

In Examples 9 to 13 and Reference Example 8, polypropylene (PP) films having a thickness of 20 μm to 75 μm were used as the film base material, and the perforation physical characteristics were prepared according to the specifications in the table, and the same as in Reference Example 1 . A package with a combined packaging specification was obtained. As described in claim 1, these packages also have a flexible film thickness in the range of 20 μm to 80 μm, and all usable results were obtained.

In Examples 15 to 17 and Reference Example 14, a polyethylene terephthalate (PET) film having a thickness of 25 μm to 75 μm was used as a film base material to prepare a film having perforated physical characteristics in the table, and the same as in Reference Example 1. A package with wrapping specifications was obtained. As a result of evaluating these packages by the above-mentioned evaluation method, all usable results were obtained.

In Examples 18 to 21, 24 to 28 and Reference Examples 22 and 23 in Table 2, each film having a thickness of 20 μm to 80 μm was used as a film base material, and the perforated section of the easily opened portion was 30 mm, and all the perforations were made. The section was set to 80 mm, the perforated physical characteristics were prepared according to the specifications in the table, and 10 sets of 100 mm × 75 mm size 2-ply tissue folded into the state of a general pocket tissue as an internal laminate were pillow-wrapped. These packages are also within the range of film physical characteristics according to claim 1, and as a result of evaluation by the above-mentioned evaluation method, all usable results were obtained.

In Comparative Examples 1 to 12 in Table 3, a film package was obtained by selecting from PE, PP, and PET in which the film substrate was used as an example in the form of a combined package and preparing perforation specifications. If the film thickness is less than 20 μm or more than 80 μm, or if the perforation physical characteristics (strength) do not meet the condition of claim 1, there is a problem that it is difficult to open the film and abnormal tearing at the time of unpacking is likely to occur. It was problematic.

In Comparative Examples 13 to 21 in Table 4, the film substrate was selected from PE, PP, and PET used in the examples, and the perforation specifications were prepared to obtain a film package in the form of pillow packaging. As a result of the above evaluation, these were also evaluated as unusable or defective in any of the items, and all of them were judged to be unusable. In all of the above examples, reference examples, and comparative examples, the perforations were perforated using a metallic perforation blade.

As described above, the present invention has been described in the embodiment of specific materials, perforation specifications, etc., but the technical scope of the present invention is not limited to the scope of the above-mentioned examples and embodiments. In addition, although it is mainly suitable for sanitary paper applications, it is a technology that can be applied to many items to be packaged.

By using the film package that wraps the sanitary paper laminate of the present invention, the perforations are opened with an appropriate force and the parts other than the perforations are difficult to tear, so a sanitary paper that is easy to handle and can be stored with peace of mind is provided. can do.

1 Flexible film A
2 Perforations for opening 3 Opening start position part 4 Opening start position display 5 Example of film strength measurement sampling position 6 Example of perforation strength measurement sampling position 7 Perforation cut part 8 Perforation tie part 9 Sanitary paper sheet 10 Perforated part after opening 11 Flexible film B
12 Y-shaped perforations

Claims (3)

At least one opening perforation row connected in a row in a film package, which is a sheet laminate of sanitary paper from which the contents of a film package packaged with a flexible film substrate can be taken out one set at a time. Easy-opening with one or more pieces and the strength (maximum point load) of the perforated portion in any of the opening perforation rows is 1.0 N / cm or more and 4.6 N / cm or less. The strength (maximum point load) of the portion of the film other than the perforations in the direction orthogonal to the perforation row direction is 5.0 N / cm or more, 8.0 N / cm or less, and the maximum point elongation. Perforated film package for opening, characterized in that the content is 14% or less. The perforated film package for opening according to claim 1, wherein the flexible film base material according to claim 1 is mainly composed of any one of polyethylene resin, polypropylene resin, and polyethylene terephthalate resin. The content of the film package according to claim 1 is a sheet laminate of sanitary paper that can be taken out one set at a time in a pop-up manner, and the sanitary paper is selected from tissue paper, toilet paper, paper towel, kitchen paper, and wiper . The perforated film package for opening according to claim 1, wherein the film package is characterized by.

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