JP5306063B2 - Sanitary tissue paper storage products - Google Patents

Description

  The present invention relates to a sanitary thin paper storage product that stores sanitary thin paper such as tissue paper, kitchen paper, and wipes.

  Generally, sanitary thin paper products such as tissue paper, kitchen paper, and wipes are sold and used in a state of being stored in a rectangular parallelepiped paper storage box having an upper surface formed with an outlet. A resin outlet film having a slit is attached to the outlet of the sanitary thin paper storage box so that foreign matter such as dust does not enter the inside. The sanitary thin paper storage box and the take-out film that have been used up from the contents of the sanitary thin paper to become an empty box are usually discarded as garbage.

Conventionally, petroleum-derived resin films such as linear low density polyethylene (LLDPE) have been widely used as the outlet film. However, with the recent increase in awareness of environmental protection, the outlet film to be discarded is CO. ₍₂₎ It was desired to use a resin film containing a plant-derived resin as an alternative to a petroleum-based resin film so as not to place a burden on the environment in terms of emissions. As such a plant-derived resin, polylactic acid is particularly promising from the viewpoint of easy availability.

JP 2005-162259 A JP 2004-83066 A JP 2008-273532 A JP 2008-247446 A JP 2007-217037 A Japanese Patent Laid-Open No. 2007-217036

However, a compound resin film in which polylactic acid is blended with polyethylene is less flexible than a film made of polyethylene alone. When this film is used as an outlet film, it has a strong resistance to take out the sanitary thin paper inside through a slit. As a result, it was found that sanitary thin paper was easily torn.
Accordingly, a main problem of the present invention is to provide a hygienic thin paper storage product that is easy to tear when taking out the sanitary thin paper contained in the outlet film while blending polylactic acid into the outlet film.

  The present inventors have obtained the following knowledge in the course of earnestly researching the above problems. In other words, when it was initially mixed with polylactic acid in a polyethylene resin film, it seemed that the flexibility was simply lost, but it turned out that a certain amount of suitable properties could be obtained as an outlet film. did.

  This will be described in more detail. The take-out film is deformed by an external force when the sanitary thin paper in the box is taken out. At this time, if the outlet film is easily plastically deformed, the edge of the slit does not return to its original state, the slit remains slightly open, and there is a risk of foreign matter such as dust entering. In addition, there is a possibility that the pop-up function of holding the start end portion of the sanitary thin paper to be taken out next with the slit is also lowered. Therefore, the outlet film is required to have a property that is difficult to plastically deform (elongate), although flexibility is required. In addition, the resin film has a property to expand or contract (dimension change) due to deterioration over time. When such expansion and contraction occurs, the take-out film becomes wrinkled and unfavorable in appearance, but the take-out film When the sag is loosened or loosened, the open / close resistance of the slit changes, which may make it difficult to take out or lower the pop-up function. Therefore, the outlet film is also required to have characteristics that do not easily expand and contract with time. Furthermore, in the process of gluing the outlet film in the manufacture of paper boxes, static electricity may be generated due to friction between the film and processing equipment, especially during the winter season, and paper dust may adhere, which may require time for cleaning. Therefore, the outlet film is also required to have a characteristic that static electricity due to friction is unlikely to occur.

  Needless to say, it is difficult to combine these characteristics. However, a resin film in which a specific amount of polylactic acid is mixed with a polyethylene resin film has sufficient flexibility (elastic deformation), but is hardly plastically deformed, hardly stretches over time, and does not easily generate static electricity. It turned out to be something. The present invention described below is based on such knowledge.

[Invention of Claim 1]
In a paper box having an outlet and a resin outlet film covering the outlet and forming a slit in the outlet range, the basis weight is 10 to 16 g / m ² , and the thickness of one sheet is 120 to 120 A lot of sanitary thin paper of 185μm is stacked and stored,
A sanitary thin paper storage product configured to take out the sanitary thin paper stored in the paper box through the slit of the outlet film,
The outlet film contains 79 to 95% by weight of polyethylene and 5 to 18% by weight of polylactic acid, the ratio of polyethylene: polylactic acid is 79:18 to 95: 5, and the thickness is 30 to 50 μm. ,
Hygienic tissue paper storage product characterized by that.

(Function and effect)
The outlet film of the present invention is a film in which polylactic acid is blended with polyethylene, but has sufficient flexibility (elastic deformation). In addition, since the outlet film of the present invention is not only that, it is difficult to be plastically deformed. Or the pop-up function is unlikely to occur. In addition, since the outlet film of the present invention has little expansion and contraction (size change) due to deterioration with time, the opening / closing resistance of the slit changes due to wrinkles on the outlet film and deterioration of the appearance, or when the outlet film is stretched or loosened. , It is difficult for the situation that it becomes difficult to take out or the pop-up function is lowered. Furthermore, since the take-out film of the present invention is less likely to generate static electricity due to friction, paper dust is less likely to adhere to the take-out film.

[Invention of Claim 2]
The sanitary thin paper storage product according to claim 1, wherein the polyolefin and polylactic acid in the outlet film are linear low-density polyethylene and plant-derived polylactic acid, respectively.

(Function and effect)
It is particularly preferable that the outlet film of the present invention has such a composition.

[Invention of Claim 3]
The sanitary thin paper storage product according to claim ² , wherein the paper box is made of coated cardboard having a weight of 300 to 450 g / m ² and a thickness of 400 to 500 μm.

(Function and effect)
The outlet film of the present invention is less flexible than the conventional LLDPE alone, but if the paper box is coated cardboard as described above, the flexibility of the outlet box is compensated by the flexibility of the paper box. Therefore, the sanitary thin paper can be drawn out smoothly as in the conventional case, and the effect of preventing tearing at the time of taking out is further enhanced.

[Invention of Claim 4]
The outlet film has an average value of 2.8 to 4.2% between the elongation at the time of 5 N / 25 mm load in the direction parallel to the slit and the elongation at the time of 5 N / 25 mm load in the direction orthogonal to the slit. The sanitary thin paper according to claim 3, wherein the sum of the dimensional change rate in the direction parallel to the slit and the dimensional change rate in the direction orthogonal to the slit is -1.6 to -0.2%. Storage product.

(Function and effect)
The outlet film of the present invention is preferably such that it is hardly plastically deformed to such an extent and that it is difficult to expand and contract with time. The elongation rate is measured when a specimen having a width of 25 mm and a length of 60 mm is collected, pulled at a rate of 100 mm / min, with a chucking interval of 50 mm, and loaded at 5 N / 25 mm, in accordance with JIS P8113. It means the elongation rate (%). In addition, the heat deterioration test is a test in which a change in dimensions before and after holding for 120 hours in a state of 60 ° C. and 90% RH from the state of JIS P 8111 is measured. Further, the dimensional change rate is (b−a) / a when the dimension in the state of JIS P 8111 is a, the dimension after being held in a test room at a temperature of 60 ° C. and a humidity of 90% RH for 120 hours. Means x100.

As described above, according to the present invention, while polylactic acid is blended in the outlet film,
(I) It becomes difficult to tear when taking out the sanitary thin paper inside.
(B) The film is stretched due to the force applied to the outlet film at the time of taking out, and the slit remains slightly open, so that it is difficult for foreign matter such as dust to enter or the pop-up function to deteriorate. ,
(Ha) Since the outlet film has little expansion and contraction (size change) due to deterioration over time, the opening / closing resistance of the slit changes due to wrinkles on the outlet film and deterioration of the appearance, or when the outlet film is stretched or loosened. It ’s hard to get a situation where the pop-up function is difficult
(Ii) Since static electricity due to friction is unlikely to occur on the outlet film, paper dust is less likely to adhere to the outlet film.
Etc. are brought about.

It is a perspective view of a sanitary thin paper storage box. It is a perspective view of a sanitary thin paper storage box, and has shown the state where an outlet was exposed.

  Next, an embodiment of the sanitary thin paper storage box according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of the sanitary thin paper storage box X1 according to the present embodiment, and FIG. 2 is a perspective view showing a state in which the outlet 12 is exposed. In addition, the dashed-two dotted line shown with the code | symbol 3 in FIG. 2 has shown the aspect of the sanitary thin paper in the use condition.

  The sanitary thin paper storage box X1 according to the present embodiment is a paper box having a rectangular parallelepiped shape, and a known sanitary thin paper storage box configuration is adopted for the size and the developed shape. The sanitary thin paper storage box X1 according to the present embodiment covers a paper box main body 1 (hereinafter also referred to as a paper box) having an annular perforation line 11 on the upper surface 1U and a range 11a surrounded by the perforation line 11 from the inside of the paper box. An outlet film 2.

  The shape of the sanitary thin paper storage box X1 is a rectangular parallelepiped shape having a rectangular upper surface composed of a pair of parallel long edges 1L, 1L and a pair of parallel short edges 1S, 1S shorter than these. The structure includes a top surface, a bottom surface and side surfaces connecting these, and a bottom surface side end surface piece, a side surface end surface piece, and a top surface side end surface piece connected to both side edges in the longitudinal direction of each surface, After the side surface end piece is folded back to the inner surface side of the box, the upper surface side end surface piece and the bottom surface side end surface piece are folded and overlapped, and the contact portion of each piece is bonded by a hot melt adhesive or the like. It can be illustrated.

As a material of the paper box 1 (hereinafter, also referred to as a paper material), a known cardboard in which paper layers mainly made of various pulps such as virgin pulp and waste paper pulp are laminated can be used. Coated cardboard having a thickness of ˜450 g / m ² and a thickness of 400 to 500 μm is suitable.

  The annular perforation line 11 formed on the upper surface 1U of the paper box 1 can be formed by a known method, and the specific shape of the range 11a surrounded by this is not limited.

  However, in the sanitary thin paper storage box, as in the illustrated example, a substantially elliptical shape or rectangle having a long side in the direction along the longitudinal direction of the upper surface 1U of the paper box has excellent takeout properties and is representative. This shape, which can be produced on many existing production lines, is preferred.

  On the other hand, the outlet film 2 is larger than the size of the range 11a surrounded by the annular perforation line 11, and is, for example, a rectangle or an ellipse. On the inner surface side of the upper surface of the paper box 1, the annular perforation line 11 is cut off. In order not to affect, it is adhered on the outer side of the annular perforation line 11.

  A slit 21 is formed in the outlet film 2, and the slit 21 is located in a range 11 a surrounded by a perforation line. Therefore, by cutting off the range 11a surrounded by the perforation line 11 along the annular perforation line 11, an outlet 12 is formed on the upper surface 1U of the paper box, and the outlet film 2 and the slit 21 formed thereon are formed. The sanitary thin paper exposed through the take-out port 12 and stored in the storage box can be taken out through the slit 21.

  The adhesion portion of the take-out film 2 to the paper box 1 is preferable in terms of moisture resistance when, for example, a solid line is adhered along the perforation line 11 according to a conventional product.

  The bonding method between the paper box 1 and the outlet film 2 is not particularly limited. For example, adhesion with an adhesive is suitable, but a fusion treatment such as ultrasonic fusion can also be employed. Both of these may be used. If an adhesive is used, a known adhesive used for this type of sanitary thin paper storage box can be used. For example, a hot melt adhesive can be used. From the viewpoint of recycling, a water-soluble adhesive such as a polyvinyl emulsion resin is suitable.

  The adhesive force (peeling strength) between the paper box 1 and the outlet film 2 is not particularly limited. The adhesive strength between the paper box 1 and the take-out film 2 in the conventional product may be the same as the take-out film is not peeled off at the time of pop-up.

  Note that the length of the slit 21 is preferably shorter than the entire length in the longitudinal direction of the outlet 12 regardless of the presence of the folded edge 2e, but may be the same as the entire length in the longitudinal direction of the outlet 12. Furthermore, it can be longer than the entire length in the longitudinal direction of the outlet 12 under conditions shorter than the length in the longitudinal direction of the outlet film 2.

  Characteristically, as the outlet film 2, a resin film containing 81 to 92% by weight of polyethylene and 5 to 16% by weight of polylactic acid and having a ratio of polyethylene: polylactic acid of 81:16 to 92: 5 is used. It is done. The resin film having such a composition has sufficient flexibility while being hardly plastically deformed. If the polylactic acid is too much, the elongation and flexibility are too low, and the sanitary thin paper is easily torn due to strong take-out resistance. On the other hand, if the amount of polylactic acid is too small, it becomes flexible but easily deforms plastically, and the take-out film is deformed by external force when taking out the sanitary thin paper in the box (particularly, strong force is applied to both ends of the slit). Since this part is easy, this part is easily extended).

  Examples of polyethylene include LLDPE, LDPE, and HDPE. Among them, LLDPE is preferably selected as a main raw material because of its excellent durability and holding power for tissue paper.

  Examples of polylactic acid include poly L-lactic acid in which the structural unit of lactic acid is L-lactic acid, poly D-lactic acid in which the structural unit is D-lactic acid, and poly DL- that is a copolymer of L-lactic acid and D-lactic acid. Copolymers of lactic acid, lactic acid or lactide and other hydroxycarboxylic acids, dicarboxylic acids, diols, cyclic lactones, or mixtures thereof are exemplified, and those derived from plants are preferably used. The number average molecular weight of polylactic acid is preferably in the range of 50,000 to 300,000, more preferably 80,000 to 150,000. When the number average molecular weight is less than 50,000, the resulting film has insufficient mechanical strength, and also frequently undergoes cutting during the stretching and winding processes, leading to a decrease in operability. On the other hand, when the number average molecular weight exceeds 300,000, the fluidity at the time of heating and melting becomes poor, and the film forming property is lowered.

  In addition to this, an anti-blocking agent for preventing unintentional adhesion between films and a slip agent for appropriately adjusting the slipping of the film can be added to the outlet film. The total amount is desirably 3% by weight or less.

  The method for producing the film is not particularly limited, and a known method can be adopted. For example, an arbitrary method such as an extrusion (melt extrusion) method such as a T-die method or an inflation method, a casting (solution casting) method, or a calendar method can be employed. In particular, the T-die method and the inflation method are preferable as the film manufacturing method.

  The thickness of the outlet film 2 is suitably 30 to 50 μm. If it is less than 30 μm, the strength is insufficient, and the probability of tearing or breaking when taking out the sanitary thin paper increases. On the other hand, if it exceeds 50 μm, there is no problem of strength, but the resistance to taking out becomes large and the cost is increased.

  The elongation rate of the outlet film 2 in the direction parallel to the slit at the time of 5 N / 25 mm load (MD direction when manufacturing the outlet film) is 2.7 to 3.8%, and the direction perpendicular to the slit (when manufacturing the outlet film) The elongation in the CD direction) is 3.0 to 4.7%, more preferably, the elongation in the direction parallel to the slit is 2.8 to 3.3%, and the elongation in the direction perpendicular to the slit is 3. It is 1 to 4.0%. If the elongation in the direction parallel to the slit is less than 2.7%, or the elongation in the direction orthogonal to the slit is less than 3.0, there arises a problem that the resistance to take out increases, If the elongation rate exceeds 3.8%, or the elongation rate in the direction perpendicular to the slit exceeds 4.7%, the film is stretched by the force applied to the outlet film during removal, and the slit remains slightly open. Therefore, it is not preferable because a foreign matter such as dust is likely to enter or a pop-up function is deteriorated. In addition to the blending amount of polylactic acid, the elongation can be adjusted as appropriate depending on the type of raw material (including resin blending), molecular weight, film thickness, stretching during production, and the like.

  Furthermore, the dimensional change rate of the outlet film 2 after the heat deterioration test is -0.5 to -1.4% in the direction parallel to the slit, -0.2 to 0.6% in the direction orthogonal to the slit, More preferably, it is -0.7 to -1.2% in the direction parallel to the slit and -0.1 to 0.2% in the direction orthogonal to the slit. If the dimensional change rate in the direction parallel to the slit is less than -1.4%, or the dimensional change rate in the direction orthogonal to the slit is less than -0.2%, there arises a problem that the take-out resistance becomes strong, and the slit is parallel to the slit. If the dimensional change rate in any direction exceeds -0.5%, or the dimensional change rate in the direction perpendicular to the slits exceeds 0.6%, the film expands or contracts (changes in natural length) due to deterioration over time, and the removal film becomes Not only does the wrinkle shift and the appearance becomes unfavorable, but also the opening / closing resistance of the slit changes when the take-out film is stretched or loosened, so that it may be difficult to take out or the pop-up function may be lowered. In addition to the blending amount of polylactic acid, the dimensional change rate can be appropriately adjusted depending on the type of raw material (including resin blending), molecular weight, film thickness, stretching during production, and the like.

On the other hand, the sanitary thin paper to be stored in the sanitary thin paper storage box X1 is not particularly limited as long as the basis weight is 10 to 16 g / m ² and the thickness of one set of two sheets is 120 to 185 μm. Examples include tissue paper, kitchen paper, and wipes for wiping. The sanitary thin paper is folded and stacked in a so-called pop-up form and stored inside as a sanitary thin paper bundle. As a result, as shown in FIG. 3, the sanitary thin paper 3 can be taken out one by one from the slit 21 and used.

  The size, thickness, number of plies, and composition of the sanitary thin paper itself are not particularly limited. In the present invention, the value obtained by subtracting the slit length 21L from the length 3L (box longitudinal dimension) 3L in the thin paper storage state is 38. It is particularly suitable when it is ˜54 mm.

  The pop-up type sanitary thin paper bundle can be manufactured by folding a sanitary thin paper base paper with a known inter-holder and then cutting it into a predetermined size.

  In the present invention, the height and size of the sanitary thin paper bundle are not particularly limited, and can be appropriately changed according to the size of the sanitary thin paper storage box to be accommodated.

In order to clarify the effects of the present invention, examples of the present invention are shown together with comparative examples.
As shown in Tables 1 and 2, various sanitary thin paper storage products in which tissue paper was stored in pairs were prepared, and various tests and evaluations shown in the same table were performed. In addition, plant-derived poly DL-lactic acid was used as polylactic acid, and LLDPE was used as polyethylene.
Further, the elongation rate, the heat deterioration (test), and the dimensional change rate are as described above.

  On the other hand, the evaluation of taking out and the evaluation of the appearance of the film are averaged by scoring the evaluations by 20 employees. The removal evaluation is based on a four-level evaluation, where there is no problem with pop-up property in the removal of all tissue papers, the one that feels resistance to the first removal is ○, and the tissue paper when the resistance at the first removal is strong and quickly pops up Is broken and the tissue paper is broken at the first removal is marked as x.

  In addition, the evaluation of appearance was made by visually judging the state of the outlet film after popping up 200 sheets, and the gap between the slit ends of the outlet film was not different from the first state in which nothing was used. Is 1 to 2 mm open, but there is no looseness in the outlet film itself, there is no problem with pop-up, but there is a looseness in the outlet film, the outlet film is loosened and the tissue paper is taken out The case where depression occurred in the middle was marked with “X”.

  In addition, for paper dust adhering to the film during carton production, it is processed for 1 hour at the same normal processing speed as when processing a conventional film in an air-conditioned manufacturing environment with an air temperature of 20 ° C. and a humidity of 50%. This is the evaluation when three people visually confirmed the amount of paper dust adhered to the film. The amount of paper powder adhered to a normal polyethylene film was evaluated as ◯, when it was clearly less than ◎, when it was too much, △, when it was very much, ×, and the averaged result was evaluated. In the actual operation, if the amount of paper dust attached is confirmed and there are many, measures such as wiping off the equipment in contact with the film are taken.

From the results shown in Table 1, in Examples 1 to 9, compared to Comparative Examples 1 to 11,
(I) It becomes difficult to tear when taking out the sanitary thin paper inside.
(B) The film is stretched due to the force applied to the outlet film at the time of taking out, and the slit remains slightly open, so that it is difficult for foreign matter such as dust to enter or the pop-up function to deteriorate. ,
(Ha) Since the outlet film has little expansion and contraction (size change) due to deterioration over time, the opening / closing resistance of the slit changes due to wrinkles on the outlet film and deterioration of the appearance, or when the outlet film is stretched or loosened. It ’s hard to get a situation where the pop-up function is difficult
(Ii) Since static electricity due to friction is unlikely to occur on the outlet film, paper dust is less likely to adhere to the outlet film.
It has been found.

  The present invention can be used as a sanitary thin paper storage box for storing sanitary thin paper such as tissue paper, kitchen paper, and wipes.

1 ... Box body (paper box)
2 ... film sheet 3 ... sanitary tissue paper 12 ... outlet 21 ... slit X1 ... sanitary tissue paper storage box

Claims (4)

In a paper box having an outlet and a resin outlet film covering the outlet and forming a slit in the outlet range, the basis weight is 10 to 16 g / m ² , and the thickness of one sheet is 120 to 120 A lot of sanitary thin paper of 185μm is stacked and stored,
A sanitary thin paper storage product configured to take out the sanitary thin paper stored in the paper box through the slit of the outlet film,
The outlet film contains 81 to 92% by weight of polyethylene and 5 to 16% by weight of polylactic acid, the ratio of polyethylene: polylactic acid is 81:16 to 92: 5, and the thickness is 30 to 50 μm. ,
Hygienic tissue paper storage product characterized by that.   The sanitary thin paper storage product according to claim 1, wherein the polyolefin and polylactic acid in the outlet film are linear low-density polyethylene and plant-derived polylactic acid, respectively. The sanitary thin paper storage product according to claim ² , wherein the paper box is made of coated cardboard having a weight of 300 to 450 g / m ² and a thickness of 400 to 500 μm.   The outlet film has an average value of 2.8 to 4.2% between the elongation at the time of 5 N / 25 mm load in the direction parallel to the slit and the elongation at the time of 5 N / 25 mm load in the direction orthogonal to the slit. The sanitary thin paper according to claim 3, wherein the sum of the dimensional change rate in the direction parallel to the slit and the dimensional change rate in the direction orthogonal to the slit is -1.6 to -0.2%. Storage product.

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