JP7195511B2 - Perforated film package for opening - Google Patents

Description

TECHNICAL FIELD The present invention relates to a perforated film package for opening, and more particularly to a film package having perforations with improved opening properties.

Conventionally, a laminated body of household thin paper (tissue paper, toilet paper), paper towels, kitchen paper, various wipers, etc. folded alternately is stored in a bag or box made of materials such as film or paper. When using the laminate, the necessary amount is pulled out from the opening in a pop-up manner and used. Packages made from films that wrap and protect laminates, which are contents, are generally used in forms such as pillow packaging, gusset packaging with gussets, and combined packaging (caramel packaging). In many cases, the opening is perforated so that it can be easily opened.

When taking out the contents from the package made of the above film or the like, once the opening of the perforations is broken, the package is taken out one set at a time. Or, a part of the contents may be destroyed by applying a 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 split open unnecessarily, resulting in insufficient protection of the contents and deterioration of the appearance. Problems such as a large amount of contents coming out of the package at once occur. In addition, perforations that are easy to open are likely to break due to a slight impact during transportation or storage, resulting in a problem of lowering the product value.

JP 2008-183034 A JP 2016-188092 A

The present invention has been devised in consideration of the problems associated with opening a film package having perforations for opening. To provide an unsealing perforated film package which can be easily unsealed by the unsealing perforations and which is difficult to tear apart from the perforations.

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

(1) In a film package, which is a sheet laminate of sanitary paper from which the contents of a film package wrapped with a flexible film substrate having a thickness of 20 μm to 80 μm can be taken out one set at a time, in one row having at least one continuous row of perforations for opening, wherein the strength (maximum point load) of the perforated line in any of the rows of perforations for opening is 1.0 N/cm or more; It is characterized by having an easy-open portion with a maximum point elongation of 3.8 N/cm or less and a maximum point elongation of 0.8% or more and 3.0% or less.

(2) The flexible film substrate of (1) is mainly composed of polyethylene resin, polypropylene resin, or polyethylene terephthalate resin.

(3) A sheet laminate of sanitary paper from which the contents of the film package of (1) above can be taken out one set at a time in a pop-up manner, the sanitary paper being tissue paper, toilet paper, paper towels, kitchen paper, various wipers, etc. is selected from

According to the present invention, the film is not easily opened during transportation or storage, and when it is necessary to take out the contents, it can be easily opened at the perforations for opening, and the film portion other than the perforations is not easily torn. It is possible to provide an unsealing perforated film package from which contents can be stably taken out.

Opening perforated film package 1 Opening perforated film package 2 Opening perforated film package 3 Enlarged view of opening perforations Appearance after removing the sheet from the film package Cross-sectional view in a direction perpendicular to the perforations of the film package in FIG. Enlarged view of Y-shaped perforation and indication of opening start position An image of a film set in the measuring section of a tensile tester

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

A first embodiment of the 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. FIG. 1 shows an example of combined packaging (caramel packaging). The opening perforated film package 1 shown in FIG. Temporary binding perforations are added to the film as an opening for taking out objects, and an opening start position display (reference numeral 4) is displayed near the center of the perforation row (reference numeral 2) with the apex of a triangle facing each other, and the film are folded closed at both ends. Although it is not always necessary to display the unsealing start position, displaying the easy-to-open portion having the perforation strength of claim 1 improves convenience for the user. In FIG. 1, there is only one perforation line for opening (reference numeral 2), but it can be provided on the opposite surface (bottom surface) or the side surface if necessary. The perforation part (reference numeral 3) in the central section is the opening start position portion, and is generally located approximately in the center of the opening perforation row (reference numeral 2). When the direction of taking out the film package from the cardboard case is constant and it is preferable for practical use to shift the opening from the center, that is, the position to hold by hand is deviated from the center In such a case, it is also possible to shift the opening from the central portion of the perforations. In such a case, it is preferable to display an unsealing start position display or the like in accordance with the easy-to-open portion.

A plurality of unsealing start positions may be provided as shown in FIG. 2, and although two are provided in the example of FIG. 2, more unsealing start positions may be provided as necessary. The strength of perforations other than the opening start position portion may be the same as that of the opening portion, but may be stronger or weaker by changing the strength of the perforations from the opening start position portion. If a portion having a stronger perforation strength than the opening start position portion is formed in the perforation row (reference numeral 2), it becomes difficult to open that portion (the perforation is difficult to open), and the film cannot be opened vigorously, resulting in abnormal tearing of the film. can be prevented. In addition, by forming a plurality of easy-to-open (cleavage) portions in the row of perforations, the entire perforations can be easily and cleanly cleaved without causing abnormal tearing of the film. Conversely, if the perforation strength is weaker than that of the unsealing start position, it is possible to easily open the perforations over a wide range when unsealing, which is effective when priority is given to easy unsealing.

FIG. 4 is an enlarged view of the perforations, in which the broken black line portion is the cut portion (reference numeral 7) and the blank portion is the tie portion (reference numeral 8). Perforation cut ratio (hereinafter referred to as cut ratio) measures the average value of the cut and tie parts in a specific section of the perforation, and divides the average value of the cut part into the average value of the cut part and the average value of the tie part. It is indicated by the value divided by the added value. It is also possible to adjust the perforation strength of the film by using the same film and changing the ratio of the cut portions, or 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, and additives such as various compounds. The film is not particularly limited as long as it satisfies (strength, thickness, elongation, etc.).

As for the shape of the perforation, a typical broken line shape (Fig. 4) was exemplified as a representative example, but a Y shape (reference numeral 11 in Fig. 7) or a V shape that gives directionality to opening when the perforation is opened. Perforations such as shape may be used, and in this case, perforations are made symmetrically around the opening start position (Fig. 7), thereby reducing the risk of the film breaking due to deviating from the perforations when opening. . Directional perforations are not limited to Y-shaped or V-shaped, but may be a shape using a curved line such as a modified Y-shaped stab, or one side of a Y-shaped line symmetry. is also available.

FIG. 5 is a diagram showing the sanitary paper taken out by opening the opening perforations, and FIG. 6 is a sectional view in the direction perpendicular to the direction of the perforations in FIG. 5, showing one set of sanitary paper inside the package. It shows a state in which they are enclosed in a superimposed form so that they can be taken out one by one in a pop-up style. When it is not necessary to use a pop-up type such as a pocket tissue, sanitary sheets may be simply stacked and enclosed.

To briefly explain the manufacturing method of the pop-up type laminate, the tissue paper contained in a carton box or the like is generally cut into rectangles and folded in half, and the sheets are folded in such a way that they face each other alternately. Approximately half of the rear portion of the front seat and approximately half of the front portion of the rear seat are held in the opening side of the seat. In multi-folder production, a required number of sheet rolls cut to a predetermined width are arranged, and a continuous stack is formed by folding them alternately while feeding them in the sheet flow direction. be. By cutting this to a predetermined length, a pop-up type laminate can be made. Also, a pop-up laminate can be produced by using an interfolder type processing machine that produces a pop-up laminate by alternately cutting and folding sheets supplied from two rolls. In addition, a non-pop-up type compact laminate such as a pocket tissue can be produced using a processing machine that cuts and stacks sheets while folding them.

Polyethylene (PE) resin, polypropylene (PP) resin, polyethylene terephthalate (PET) resin, etc. are suitable for the film base material constituting the package. Any resin film can be used. These films may be laminated, if necessary, or modified by resin coating or metal vapor deposition on the surface before use. In addition, a pigment such as calcium carbonate may be added to the resin in order to enhance the concealability of the contents, and it is also possible to enhance the concealability and visibility by printing.

The thickness of the flexible film used for packaging (as measured by JIS P 8118:2014) is preferably in the range of 20 µm to 80 µm. If the thickness is less than 20 μm, the film strength generally becomes low, and troubles such as breakage and perforation are likely to occur during perforation processing and heat-sealing processing. In addition, if the thickness exceeds 80 μm, the cost of the film increases and it is not practical. In addition, the advantage of flexibility when using a film is lost due to a decrease in flexibility, and processing defects due to a decrease in thermal conductivity during heat sealing. problem is likely to occur and is not practical. Furthermore, when the laminated body (sanitary paper sheet) inside the package is taken out sequentially, the volume of the laminated body is reduced, and the height of the unsealing portion is lowered accordingly, so that the ease of taking out can be maintained, and it is possible to maintain the ease of taking out. Although there is an advantage that the sheet does not fall into the inside of the package, etc., a decrease in the flexibility of the film is a factor that impairs these characteristics, which is not preferable.

The sanitary paper of the present invention refers to household thin paper (tissue paper and toilet paper), paper towels, kitchen paper, various wipers, etc. Wood pulp is generally used as a raw material for these, but various vegetable fibers and waste paper are used. Sheets such as pulp, sheets obtained by mixing various pulps with synthetic fibers, and sheets such as non-woven fabric can be used, and if necessary, these sheets are used after being multi-layered (multi-ply) or embossed. As for these sheets, a sheet in which about 2 to 4 sheets are stacked is often used, but the number is not particularly limited to 4 sheets or less.

The general size of the sanitary paper that constitutes the laminate is about 60 mm to 250 mm on one side in an unfolded state because it is used for wiping, wrapping, etc., by taking it out by hand. often. Therefore, it is preferable that the length of the opening perforation is also in the range of 60 mm to 250 mm. If the length of the opening perforation is longer than the width of the sheet when the sheet is taken out from the opening, problems such as a plurality of sets of sheets coming out at once or the front part of the next sheet not coming out of the package easily occur. Become. On the other hand, if it is too narrow, problems such as the sheet being difficult to take out easily or being broken in the middle tend to occur.

The opening start position portion (easy-opening portion) in the row of perforations for opening 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 perforation for opening, film material, and thickness It is preferable to select the length according to the above. The easy-to-open function is achieved by providing one easy-to-open portion in the vicinity of the central portion of the row of perforations, but multiple easy-to-open portions may be provided if necessary.

As a method of making perforations for opening the film, there are a method of making perforations 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 create a cut portion. . When a laser beam is used, the amount of heat applied to the film can be changed by adjusting the output to easily form a completely cut portion or a thin portion of the film. In this method, the film may not have a cut portion. In the case of the perforation forming method using such a laser beam or the like, the portion where the film is heated and thinned is used as a pseudo cut portion, and the unheated portion is used as a tie portion to form a pseudo perforation. is good.

The perforation strength of the film described in claim 1 was measured using a tester capable of measuring the tensile strength and elongation of sheets such as paper and film. As shown on the left side of FIG. The distance between the ends of B) was set to 50 mm, and both ends of the strip were clamped so that the perforations were positioned in the center of the clamping interval so as not to slip, and a tensile test was performed. The tensile speed of the tester was set at 100 mm/min, and the measurement was performed until the film broke from the perforations. Measured values obtained by rupturing from portions other than the perforations were excluded, and the results of 10 measurements were averaged to obtain the measured value. As the film is stretched, it generally becomes unable to withstand the stress, plastically deforms, and finally breaks. In the process, the maximum point load indicates the maximum tensile strength, and the measured value was normalized to a width of 10 mm (1 cm) for evaluation. Moreover, when 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 the width may be standardized to 10 mm. The maximum point elongation is expressed as a percentage by dividing the elongation of the film at the maximum point load by the gripping distance of 50 mm. The higher the maximum point elongation, the greater the deformation when the film is pulled, and even if the maximum point load value is small, the sharpness of the perforations of the film tends to be poor. In the case of a film with a low maximum point load, the film tends to be prone to abnormal tearing at the edge of the perforation. There is a method of shaping, but there are problems such as a decrease in productivity at the time of perforation processing and the occurrence of defective products.

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. It is desirable to appropriately adjust the length depending on the material, thickness, additives, etc. of the film. If it is less than 0.3 mm, the perforation will easily split open, and if it exceeds 5 mm, it will be difficult to open and the perforation will not function. Moreover, the length of the cut portion of the opening perforations is preferably 1 mm or more and 10 mm or less. If it is less than 1 mm, problems tend to occur because stable processing cannot be performed in perforation processing using a perforating blade, laser light, or the like. If the thickness exceeds 10 mm, the film is easily broken, making it unsuitable for transportation and storage. In addition, the perforated opening becomes large, which causes the problem that foreign matter such as dust easily enters during storage. Further, the range of the portion having perforation strength shown in claim 1 is not particularly limited, but it is not a problem if it is 10 mm or more, preferably 15 mm or more. If the strength of the perforation is 10 mm or more, the package can be easily opened by pressing a finger on the portion slightly shifted from the opening start position indicating the portion.

FIG. 3, which is the second embodiment, is an example of a pillow packaging form wrapped with a flexible film C (reference numeral 6). Pillow packaging is often used for pocket tissues and the like, and this form is compact. Therefore, the length of the perforations in the package is generally shorter than 100 mm. If the length of the perforations is about 100 mm or less, it is preferable that the length of the perforations is about 40 mm or less to facilitate opening. In such a case, multiple easy-to-open parts may be provided. In addition, when the thickness of the laminate, which is the object to be packaged, increases, it is preferable to use a gusseted gusset. Appropriately applicable.

As shown in Tables 1 to 4 below, the packaging form, film substrate, and film thickness of the film package are changed, and the perforation specifications for the easy-open part (opening start position part) and other parts are prepared. A packaged body was produced and evaluated. As for the perforations of the combined package, as an example, the specifications of the perforations in the easy-open portion were set to 40 mm width at the center of the perforation row, and a 20 mm width sample was sampled from the perforation line and subjected to a tensile test. A 20 mm wide sample was also taken from the end of the perforation and subjected to a tensile test. As for the perforation of the pillow package, a 30 mm width at the center of the perforation row was used as the perforation specification at the opening start position, and a 20 mm width sample was sampled and subjected to a tensile test in the same manner as the combined package. Similarly, a 20 mm wide sample was taken from the end of the perforation, and the tensile test was performed.

For the evaluation of the perforation openability of the easy-open portion, five evaluators opened two packages each, and evaluated the ease of opening and the presence or absence of perforation opening failure after opening. The perforation openability was selected from good and poor, and when all five evaluators judged it easy to open, it was good (◎), when four evaluated it easy to open, it was usable (○), and two or more evaluated it poor. It was regarded as defective (x) when it was set as. Evaluation of perforation openability was carried out by holding the package so that the perforations of the package were vertically aligned in front of the evaluator, and placing the package at a distance of 15 mm to the left and right from the perforation at the opening start position of the package. It was evaluated whether or not the package was easily opened when the center of the thumb was placed on the package and force was applied to open the package. Regarding the possibility of tearing perforations in the film package when unpacking the outer film, etc. and taking out the film package, when manufacturing the film package that wraps the bundle of sanitary paper, etc. in film, packing, transporting, etc. , Using the method for evaluating perforation opening property, the perforation was evaluated by placing the centers of the left and right thumbs at a distance of 30 mm from the perforation and opening. When 2 or more of the 5 evaluators evaluated the product as easy to open, the possibility of perforation opening abnormality during unpacking was high (×), and when 1 or less evaluated it, the possibility of abnormality was low (○). In addition, the evaluation of the perforation end cleavage abnormality was performed by five evaluators who opened two packages each, and when there were three or more packages with a cleavage abnormality of 5 mm or more at the end of a total of 10 packages. It was evaluated as unusable (X), usable in the case of 1 to 2 packages (○), and no abnormality in the case of no abnormality (⊚). In the evaluation of these three items, those without x were evaluated as usable products.

As shown in Table 1, in Examples 1 to 10, the film substrate was a polyethylene (PE) film, and the film was changed in thickness in the range of 20 to 80 μm. The perforation section of the part is 40 mm, and the perforation physical properties described in the table are processed, and 150 sets of 2-ply tissue paper (size 198 mm x 103 mm when folded in half) are enclosed in the package and wrapped together. A package (upper surface size approximately 200 mm×approximately 105 mm, height approximately 50 mm) was produced. As a result of evaluating these packages by the evaluation method described above, all of them were good or usable. These packages had perforation strength within the range specified in claim 1, had good opening properties at the perforations, and had no abnormal opening.

In Examples 11 to 18, a polypropylene (PP) film having a thickness of 20 μm to 75 μm was used as the film base material, and the physical properties of the perforations were produced according to the specifications in the table. Got the package. As described in claim 1, these packages also had a flexible film thickness ranging from 20 μm to 80 μm, and all of them were usable.

In Examples 19 to 22, a polyethylene terephthalate (PET) film having a thickness of 25 μm to 75 μm was used as the film base material, and a film having the perforated physical properties shown in the table was produced and wrapped in the same manner as in Example 1. was obtained. As a result of evaluating these packages by the evaluation method described above, all of them were found to be usable.

In Examples 23 to 35 in Table 2, each film having a thickness of 20 μm to 80 μm is used as the film base material, the perforation section of the easy-to-open portion is 30 mm, the total perforation section is 80 mm, and the physical properties of the perforation are shown. 10 sets of 2-ply tissues of 100 mm×75 mm size folded in the state of a general pocket tissue were pillow-packaged as an internal laminate. These packages also had the film physical properties within the range described in claim 1, and as a result of evaluation by the evaluation method described above, all of them were found to be usable.

In Comparative Examples 1 to 11 in Table 3, the film substrate was selected from PE, PP, and PET used in the Examples, and the specifications of perforations were changed to obtain film packages in the form of a combined package. If the film thickness is less than 20 μm or more than 80 μm, or if the physical properties (strength) of the perforation do not satisfy the conditions of claim 1, it may be difficult to open, the tear at the end of the perforation may become large, and when unpacking Abnormal cleavage of is likely to occur, and there is a problem in use.

In Comparative Examples 12 to 22 in Table 4, the film substrate was selected from PE, PP, and PET used in the Examples, and perforation specifications were changed to obtain film packages 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 were judged as unusable. In both the above examples and comparative examples, the perforations were perforated using a metal perforation blade.

As described above, the present invention has been described with specific materials, specifications of perforations, etc., but the technical scope of the present invention is not limited to the above examples and embodiments. Although it is mainly suitable for use as sanitary paper, it is a technology that can be applied to many items to be packaged.

By using the film packaging body in which the sanitary paper laminate of the present invention is packaged, the perforations can be opened with an appropriate force, and the portions other than the perforations are difficult to tear, so that the sanitary paper can be easily handled and stored safely. can do.

1 flexible film A
2 Opening perforation 3 Opening start position portion 4 Opening start position display 5 Flexible film B
6 flexible film C
7 Perforation cut part 8 Perforation tie part 9 Sanitary paper sheet 10 Perforation part after opening 11 Y-shaped perforation

Claims (3)

Unsealing in a single row in a film package that is a sheet laminate of sanitary paper from which the contents of the film package wrapped with a flexible film substrate having a thickness of 20 μm to 80 μm can be taken out one set at a time. at least one perforation row for opening, and the strength (maximum point load) of the perforation portion in any of the perforation row for opening of the perforation row for opening is 1.0 N / cm or more, 3.8 N / cm or less, the maximum point elongation is 0.8% or more and 3.0% or less , and the maximum point load at the end of the perforation is 1.93 N/cm to 4.0%. A perforated film package for opening, characterized by having a tensile strength of 81 N/cm . 2. The unsealable perforated film package according to claim 1, wherein the flexible film substrate according to claim 1 is mainly made of polyethylene resin, polypropylene resin or 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 towels, kitchen paper, and various wipers . The perforated film package for opening according to claim 1, characterized in that:

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