JP6400368B2 - Bamboo powder mixed resin film and its application - Google Patents

Description

The present invention, bamboo or dry distillation bamboo fine powdered processed bamboo powder mixed resin film formed of a resin material which is mixed ing bamboo powder, resin bag made of this bamboo powder mixed resin film, The present invention relates to a resin glove made of this bamboo powder mixed resin film.

  Since bamboo has an antibacterial action to prevent the growth of bacteria such as Escherichia coli and Staphylococcus aureus, resin molded products mixed with bamboo powder are used as a material having an antibacterial action. For example, if a container for storing an article such as food that is not corrosive is made of the resin sheet, the shelf life or expiry date of the food can be extended. For example, Patent Document 1 discloses a resin molding material in which bamboo powder is mixed. In addition, as shown in Patent Document 2, a bamboo powder production apparatus for producing bamboo powder from bamboo has been developed.

Japanese Patent Laid-Open No. 11-148017 JP 2012-250531 A

  Conventionally, the particle size of bamboo powder used is usually about 200 μm. However, in the case of a container formed by molding a resin sheet mixed with bamboo powder of such particle size, the feel is too rough. However, there was a problem in transparency and aesthetics (for example, the smoothness of the surface).

  On the other hand, a resin film made of a resin material mixed with bamboo powder having a particle size of about 200 μm is not only less flexible, but in the case of a plastic bag, for example, its thickness is about 10 to 50 μm. It became a diameter, was inferior in tensile strength, and the unevenness | corrugation of the film was large, and it was practically difficult to use it as a film. Also, in the case of this type of resin film, it is too rough to feel that the touch is good, and there is a problem in transparency and aesthetics (for example, the smoothness of the surface).

  The present invention has been made in view of the above-mentioned points, and can be sufficiently used as a bamboo powder-containing resin sheet or a film that has a moderately good touch feeling, can exhibit appropriate transparency, and improves aesthetics. An object of the present invention is to provide a resin film mixed with bamboo powder and applications thereof.

The present invention is a bamboo powder-mixed resin film molded from a resin material mixed with bamboo powder, wherein the particle size of the bamboo powder is equal to the thickness of the bamboo powder-mixed resin film and is not more than twice the thickness. Furthermore, the bamboo powder-containing resin film has a thickness of 30 μm or less, and the bamboo powder has a particle size of 30 μm or less .
If the particle size of the bamboo powder mixed in the resin material is made equal to (less than twice) the thickness of the resin film mixed with bamboo powder, there will be no rough texture that is strong against the touch of the resin film mixed with bamboo powder, and the touch will be good. In addition, it has moderate frictional resistance due to the small unevenness, and it can improve the aesthetics because it can have high transparency, and it can increase the tensile strength compared to the case of using bamboo powder with a large particle size, Also has antibacterial action to prevent breeding. Since it has an antibacterial action to prevent the growth of bacteria, it can be effectively used as a film for packaging foods that do not like corrosion.

Moreover, this invention exists in the resin bag characterized by being manufactured with the said bamboo powder mixed resin film.
By using the bamboo powder-containing resin film according to the present invention, it is possible to improve the tensile strength of the resin bag containing bamboo powder and to put it into practical use. This makes it possible to use a resin bag that has a good feel, is easy to hold with moderate frictional resistance (does not slip), has high transparency, can improve aesthetics, and can effectively prevent bacterial growth. I was able to plan.

Moreover, this invention exists in the resin glove characterized by being manufactured with the said bamboo powder mixed resin film.
By using the bamboo powder-mixed resin film according to the present invention, it is possible to improve the tensile strength of the resin gloves containing bamboo powder and to put it into practical use. This makes it possible to use a resin bag that has a good feel, is easy to hold with moderate frictional resistance (does not slip), has high transparency, can improve aesthetics, and can effectively prevent bacterial growth. I was able to plan.
In particular, when this resin glove is used as a care glove, it does not give a caregiver an uncomfortable feeling because there is no strong rough feeling. Moreover, since the surface of the resin glove made of the bamboo powder-mixed resin film is difficult to slip, it is possible to prevent the gripped care device from sliding off the gripping finger when gripping various care devices.

According to the present invention, the hand touch feeling reasonably good, even improved aesthetic appearance can issue an appropriate transparency, and in can be sufficiently used as a film (practically possible), particularly resin bags and resin gloves It can be used as a suitable bamboo powder-containing resin film.

It is a flowchart which shows the formation process of the bamboo powder mixing resin sheet which concerns on a reference example . It is a flowchart which shows the formation process of the bamboo powder mixing resin film which concerns on this invention. It is sectional drawing which shows the state which accommodated the foodstuff in the resin container created with the bamboo powder mixed resin sheet which concerns on a reference example , and covered the opening part with the bamboo powder mixed resin film. It is a flowchart which shows the film back (plastic bag) manufacturing process by the bamboo powder mixed resin film which concerns on this invention. It is a figure which shows the structural example of the film back (plastic bag) made with the bamboo powder mixed resin film which concerns on this invention.

Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a flowchart showing a molding process of a bamboo powder-mixed resin sheet according to a reference example . As illustrated, for example, polypropylene (PP) powder is prepared as the resin powder 101, bamboo powder having a particle size of 30 μm or less is used as the bamboo powder 102, and various powders that will be described in detail later are prepared as other powders. In step ST1, the resin powder 101, the bamboo powder 102, and the other powder 103 are charged into a mixer (not shown) at a predetermined ratio and mixed. In step ST2, the mixed resin powder 101, bamboo powder 102 and other powder 103 are heated and melted.

  In step ST3, the mixed molten resin body heated and melted is extruded in a strip shape from an extrusion nozzle having a slit-like discharge port, and further stretched in the longitudinal and lateral directions while transporting the extruded strip-shaped mixed molten resin body. And formed into a bamboo powder-containing resin sheet having a predetermined thickness (for example, 0.5 mm or less). In step ST4, the molded bamboo powder-containing resin sheet is cut (cut) into a predetermined size and shape.

  The bamboo powder 102 is produced by crushing a dried bamboo material (for example, Soso bamboo material) using a bamboo powder production apparatus to produce a bamboo powder having a large particle size of about 100 to 200 μm (conventionally this particle size). Used bamboo powder). Next, the bamboo powder having a large particle size is further pulverized using another pulverizer to obtain a bamboo powder having a particle size of 30 μm or less. Since the bamboo powder used in the present invention is pulverized in a plurality of stages using a plurality of pulverizers, a bamboo powder having a particle size of 30 μm or less could be obtained. In other words, the bamboo powder used in the present invention cannot be easily obtained unless the bamboo is pulverized in a plurality of stages. In addition, although the dried bamboo material is used here, what was made into the bamboo powder with a particle size of 30 micrometers or less using the dry-distilled bamboo (what boiled the bamboo at the temperature of about 200 degreeC with the kiln for 2 to 4 hours) is used. . In addition, it is more preferable if the particle size of the bamboo powder is 20 μm or less.

  Other powders 103 include tougher powder, methabrene powder, dolomite powder, maleic acid powder, titanium powder, and talc powder. The mixture ratio of the resin powder 101, the bamboo powder 102, and the other powder 103 is determined in consideration of the tensile strength, rigidity, touch feeling, antibacterial properties, etc. when the bamboo powder-mixed resin sheet is formed into a container in a later process. . Here, resin powder 101, bamboo powder 102 and other powder 103 are mixed, but in some cases, all of other powder 103 is not used (resin powder 101 and bamboo powder (particle size 30 μm or less) 102 only). In some cases, only a part of the other powder 103 is used. That is, in consideration of the flexibility, tensile strength, rigidity, hand feeling, antibacterial property, transparency, etc. of the resin sheet mixed with bamboo powder, the mixing ratio of the resin powder 101 and bamboo powder 102, and the types and mixing of other powders 103 Determine the percentage amount.

  Next, the resin container according to the present invention is manufactured by forming the bamboo powder-mixed resin sheet cut into the predetermined shape into a container having a predetermined shape. The resin container is manufactured using, for example, a vacuum molding machine. This vacuum forming machine is provided with a mold in which a concave portion having a predetermined shape is formed on one surface, and a plurality of vacuum suction holes are formed at the bottom of the concave portion. The bamboo powder-mixed resin sheet cut into the predetermined size is brought into close contact with the surface of the mold where the recess is formed, and the air in the recess is exhausted through a vacuum suction hole. Thereby, the bamboo powder-mixed resin sheet is brought into close contact with the inner surface of the recess and deformed to manufacture a resin container having a recess corresponding to the recess of the mold. In the molding process of the resin container, the bamboo powder-mixed resin sheet is easily deformed by heating the bamboo powder-mixed resin sheet to an appropriate temperature. Easy to manufacture. Needless to say, other various methods (for example, pressure forming, press forming, etc.) may be used as the method for forming the container.

  Since the resin container (bamboo powder-mixed resin sheet) molded as described above has a bamboo powder particle size of 30 μm or less, the touch feels like when the bamboo powder particle size is about 200 μm. In addition, the surface can be highly transparent, the surface smoothness can be improved, the appearance can be improved, and the antibacterial action can be prevented to prevent the growth of bacteria.

  FIG. 2 is a flow chart showing the molding process of the bamboo powder-containing resin film according to the present invention. As illustrated, for example, polyethylene (LLDPF) powder as the resin powder 111, dry-distilled bamboo powder having a particle size of 30 μm or less as the bamboo powder 112, and dolomite that increases the antibacterial property of, for example, 5 μm as the other powder 113. Prepare powder. In step ST11, the resin powder 111, the bamboo powder 112, and the other powder 113 are put into a mixer (not shown) at a predetermined ratio and mixed. In step ST12, the mixed resin powder 111, bamboo powder 112, and other powder 113 are heated and melted.

  In step ST13, the heated and melted bamboo powder mixed molten resin body is extruded in a band shape from an extrusion nozzle having a slit-shaped discharge port, and further, while the band-shaped bamboo powder mixed molten resin body is transported in the vertical and horizontal directions. It is stretched and formed into a bamboo powder-containing resin film having a predetermined thickness (for example, 0.03 to 0.05 mm). The bamboo powder mixed resin film is wound around a cylindrical core material to form a film roll. In addition, the ratio of the resin powder 111, the bamboo powder 112, and the other powder 113 is determined in consideration of the flexibility, the tensile strength, the touch feeling, the antibacterial property, the transparency, etc. of the bamboo powder mixed resin film. Moreover, the other powder 113 is not necessarily required, and the powder 113 may not be used in some cases. In addition, here, dry-distilled bamboo powder is used as the bamboo powder 112, but bamboo powder having a grain size of 30 μm or less may be used.

  As shown in FIG. 3, foods A and B are accommodated in the recesses of the resin container 10 made of the bamboo powder-mixed resin sheet, and the opening of the resin container 10 is covered with a resin film 11 mixed with bamboo powder. The weld portion 12 is formed at the contact portion between the resin container 10 and the resin film 11 near the outer periphery of the resin container 10, and the inside of the resin container 10 is sealed with the resin film 11. Since the resin container 10 and the resin film 11 have antibacterial properties that prevent the growth of bacteria such as Escherichia coli and Staphylococcus aureus as described above, the foods A and B are hardly corroded. Thus, the expiration date of food A and B can be lengthened by storing food in the container 10 made of bamboo powder-mixed resin sheet and covering the opening with the resin film 11 mixed with bamboo powder. it can.

  FIG. 4 is a flowchart showing a schematic manufacturing process of a resin bag (plastic bag) using a bamboo powder-containing resin film according to the present invention. As shown in the figure, resin powder (for example, polyethylene powder) 111, bamboo powder (for example, dry-distilled bamboo powder having a particle size of 30 μm or less) 112 and other powders (for example, dolomite for increasing antibacterial properties having a particle size of 5 μm). (Powder) 113 is put into the mixing / melting machine 21 at a predetermined ratio, mixed and melted, and then the molten bamboo powder mixed melt is put into the extrusion device 23. The extrusion device 23 is provided with a nozzle 25 having an annular opening, and a molten bamboo powder mixed resin body is blown out from the annular opening of the nozzle 25. Air is ejected from the center of the nozzle 25 simultaneously with the blowing of the bamboo powder mixed molten resin body. Thus, the bamboo powder mixed molten resin body blown out becomes a resin film shape and swells to a predetermined size, and is formed into a long bamboo powder mixed resin film cylinder 27.

  The bamboo powder-containing resin film cylinder 27 is passed through a folding mold 29 whose both side surfaces are cut inward and the upper and lower surfaces are narrower toward the outlet side. It is pressed from both upper and lower sides by the pressing rollers 31, 31 and is formed into a cylindrical sheet body 33 having a fold inside. The sheet body 33 is pulled out by the guide rollers 35 and 35 and guided to the cutting means 37 and 37. On the downstream side of the cutting means 37, a guide / roller 39, 39 and a cutting / sealing means 41 are arranged via the guide rollers 39, 39. This cutting / sealing means 41 can perform cutting and sealing simultaneously. That is, the cut / sealing means 41 heat-seals the sheet body 33 of the bamboo powder-mixed resin film (melts and bonds the front and back pieces of the cylindrical body) at predetermined intervals according to the size of the bag.

  The cutting / sealing means 41 is configured as a pair of upper and lower sealing members having a width that traverses the sheet body 33. The sheet 33 is conveyed between the seal members. And the sheet | seat body 33 is cut | disconnected by the cutting machine in the just downstream position of a sealing position simultaneously with the seal | sticker for this predetermined space | interval. Thus, the downstream end side of the cut sheet body 33 is not sealed, and a sealed bag is formed on the upstream end side. Further, a bag stock stage 43 is provided via the downstream guide rollers 39, and a predetermined number of bamboo powder-containing resin film bags are stacked on the stock stage 43.

  The bamboo powder mixed resin film bag of the stock stage 43 is carried to a cutting stage (not shown). In the cutting stage, the bamboo powder-containing resin film bag is cut into a shape having a pair of hand-held portions 51 and 51 and a knot portion 53 as shown in FIG. As a result, a shopping bag (resin bag) made of a bamboo powder-mixed resin film having a hand-held portion is completed. The thickness of the bamboo powder-containing resin film constituting the shopping bag was 20 μm.

  In addition, this inventor made a trial manufacture of the plastic bag of the structure shown in FIG. 5 with the resin film when the bamboo powder having a particle size of 100 μm and 50 μm is mixed and when the bamboo powder having a particle size of 30 μm or less is mixed. , Compared the differences. As a result, when bamboo powder having a particle size of 100 μm (particle size is large or small) was mixed, the tensile strength was weak, the transparency was low, and the plastic bag could not be used. In the case of a particle size of 50 μm, the tensile strength and the transparency were improved as compared with those having a particle size of 100 μm, but again, the plastic bag could not be used. In the case of a particle size of 30 μm, the tensile strength and transparency were further improved, and a plastic bag that could sufficiently withstand use could be obtained.

  Since the plastic bag made of the above-mentioned bamboo powder-containing resin film has a bamboo powder particle size of 30 μm or less, that is, the particle size of the bamboo powder is made equal to the thickness (20 μm) of the bamboo powder-containing resin film. For example, the grain size of the bamboo powder is less than twice the thickness of the bamboo powder-containing resin film), so there is no rough feeling against the feeling of touching the bamboo powder-containing resin film, and the touch is good. It is easy to hold (does not slip) with moderate frictional resistance, and can be highly transparent, so it can be improved in appearance, and can have higher tensile strength compared to the case of using bamboo powder with a large particle size. Became possible. It also has antibacterial action to prevent bacterial growth. Further, since bamboo thinned from bamboo can be used as a raw material for bamboo powder, a large amount of bamboo powder can be obtained at low cost.

  Further, the bamboo powder-containing resin film according to the present invention is also suitable for use in resin gloves, in particular, resin gloves for nursing care. That is, the bamboo powder-containing resin film according to the present invention has a bamboo powder particle size of 30 μm or less, that is, the bamboo powder particle size is made equal to the thickness (20 μm) of the bamboo powder-containing resin film (further, Speaking of which, the grain size of bamboo powder is less than twice the thickness of the resin film mixed with bamboo powder), so it feels better than a resin film mixed with bamboo powder with a particle size of 100μ and 50μ (strong rough texture) Because there is no feeling, the cared person will not be uncomfortable, and has an appropriate frictional resistance (the surface is difficult to slip, so when holding various care devices, etc. It can also prevent slipping down), and can also enhance transparency, so it can improve aesthetics, increase tensile strength, and effectively prevent bacterial growth, so it can be used for nursing care such as resin gloves for nursing care. Also it becomes possible to practical use as can be suitably used.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

  Since the present invention is a resin sheet and a resin film mixed with bamboo powder having a particle size of 30 μm or less, it has excellent flexibility, high tensile strength, and antibacterial properties. It can be used as a resin container for packaging a resin container or food. Moreover, since the bamboo powder to be mixed may be thinned bamboo, the manufacturing cost can be reduced.

DESCRIPTION OF SYMBOLS 10 Resin container 11 Resin film 12 Welding part 21 Mixing / melting machine 23 Extruding device 25 Nozzle 27 Film cylindrical body 29 Folding form frame 31 Pressing roller 33 Sheet body 35 Guide roller 37 Cutting means 39 Guide roller 41 Cut / seal means 43 Stock stage 51 Hand-carrying part 53 Knot part 101 Resin powder 102 Bamboo powder 103 Other powder 111 Resin powder 112 Bamboo powder 113 Other powder A Food B Food

Claims (3)

Bamboo powder mixed resin film molded with resin material mixed with bamboo powder,
The bamboo powder has a particle size equal to or less than twice the thickness of the bamboo powder-mixed resin film, and the bamboo powder-mixed resin film has a thickness of 30 μm or less. Bamboo powder-mixed resin film characterized by being 30 μm or less . A resin bag made of the bamboo powder-containing resin film according to claim 1 . A resin glove manufactured with the bamboo powder-containing resin film according to claim 1 .

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