JP3731040B2 - Manikin made of biodegradable polylactic acid foam and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a biodegradable foam mannequin, and more specifically, is biodegradable and has a uniform wall thickness, cells are dense, have excellent elasticity and resilience, and have excellent resistance. The present invention relates to a mannequin made of a biodegradable polylactic acid foam having impact properties and good dimensional stability.
[0002]
By the way, in this specification, “manikin” is a simulated body of the entire human body in which arms and legs can be detachably connected to enable detachment of clothing, etc. Body, more specifically, a so-called “body” which is a simulated body such as a half-body simulated body, a head simulated molded body, a chest simulated molded body, a waist simulated molded body, a leg simulated molded body, and an arm simulated molded body. In addition, all of the so-called “relief” used for displaying products such as underwear and accessories in a half-split type of a human body simulation molded body and sales promotion tools such as objects are included.
[0003]
[Prior art]
As a conventional mannequin made of such a foamable resin, a laminate obtained by laminating a thermoplastic resin sheet on a foamable polyethylene resin is vacuum-molded, and the hollow is formed thinly with a flexible synthetic resin material. There has been proposed an inner body integrated with a foamable synthetic resin inner body formed in accordance with the inner body (Japanese Patent Laid-Open No. 61-86063).
[0004]
In addition, by using foaming urethane resin as foaming synthetic resin, human body components such as the head, chest, and abdomen are produced, and these human body components are connected with bolts, etc. Has been made.
[0005]
[Problems to be solved by the invention]
However, when molding a human body constituent member using a conventional foamed synthetic resin including the above-mentioned urethane foam resin, a predetermined compounding raw material is injected into the mold, and this is foamed and cured to form a mold. Since the surface shape is obtained in accordance with the inner surface shape, an extremely expensive mold is indispensable when molding each member, and the mannequin is damaged or unnecessary and is discarded. In some cases, it had to be disposed of as industrial waste. Therefore, there is a problem that the cost is high and the production adjustment is difficult.
[0006]
If a polytetrafluoroethylene-based synthetic resin is molded into a foamed board material as a foamable synthetic resin, and then this board material is secondarily processed, a so-called foamable synthetic resin mannequin should be manufactured. However, this mannequin has a problem in that the polytetrafluoroethylene-based synthetic resin is not only expensive but cannot be recycled.
[0007]
The prior art described in JP-A-61-86063 is only used by molding a foamable synthetic resin as an inner body. Although this mannequin doll has the advantage of being light, hard to break, and inexpensive, the mannequin surface is made of a flexible synthetic resin material and is thinly formed. In addition, it is not possible to obtain characteristics such as surface finish that can be obtained only with the foamable synthetic resin.
[0008]
By the way, when conventional synthetic resin mannequins are damaged or are no longer needed and are discarded, all the materials are not decomposed in the natural environment. Therefore, it becomes a serious social and ecological problem such as landfill shortage, soil, river and ocean pollution. On the other hand, even if it is attempted to collect and recycle, it is bulky and the collection cost is high, and further, there are problems such as damage to the incinerator at the time of incineration and generation of toxic gas.
[0009]
As one of such environmental load suppression means, it is desired to develop a biodegradable polymer that is incorporated into a natural material circulation system that is decomposed by microorganisms in soil or water and does not pollute the environment. As these biodegradable polymers, various synthetic and natural polymers are known, such as polyhydroxybutyrate, polylactic acid, polycaprolactone, cellulose, chitosan, and starch. In addition, there are those using polyvinyl alcohol, polyethylene, ethylene / vinyl acetate copolymer and the like as an improving agent for cellulose, starch and the like that are difficult to process, and for example, JP-A-5-39377 discloses corn starch and the like. Techniques relating to foams such as natural products mainly composed of polysaccharides and derivatives thereof are disclosed.
[0010]
On the other hand, lactic acid-based polymers are attracting attention as environmentally-friendly polymers because of their high stability and low combustion calories during incineration, and lactic acid-based polyesters such as copolymers of polylactic acid and ε-caprolactone. The foam is disclosed in, for example, JP-A-4-304244, JP-A-5-140361, JP-A-6-287347, and JP-B-5-508669.
[0011]
However, although the conventional polylactic acid foam is excellent in biodegradability, it has the disadvantages that it is poor in elasticity and resilience and is brittle to mechanical impact, and the copolymer of lactic acid and ε-caprolactone is a comparison. However, since the heat resistance is inferior, it is difficult to obtain a stable molded product at the time of secondary molding, and there is a problem that it can be used only for limited applications.
[0012]
The present invention has been made in view of the above-described actual condition, and the object of the present invention is to maintain biodegradability, the cell has a dense and uniform wall thickness, elasticity, resilience, and excellent. It is intended to provide a mannequin made of a biodegradable polylactic acid foam having excellent impact resistance and good dimensional stability.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the gist of the means adopted by the present invention is as described in the appended claims.
[0014]
According to the manikin made of biodegradable polylactic acid foam according to the invention described in each claim, the weight of the mannequin itself can be reduced, the amount of expensive polylactic acid used can be reduced, and the manufacturing and transportation costs can be reduced. Can be reduced.
[0015]
In addition, since the mannequin itself is biodegradable, it is naturally decomposed by burying it in the soil as it is. Therefore, environmental problems and ecological problems of the above-mentioned conventional mannequins, and the incinerator during incineration All problems such as damage and generation of toxic gas can be solved.
[0016]
Each mannequin, cell dense, has a texture finished with excellent clean, yet resilient, superior in resilience and impact resistance, further, the water content of the polylactic acid pellets are 75~250ppm And a biodegradable polylactic acid mannequin formed into a flat surface with a clean surface. When the water content of the polylactic acid pellets is about 10 to 75 ppm, a biodegradable polylactic acid mannequin having an embossed surface shape can be provided.
[0017]
According to the mannequin made of the biodegradable polylactic acid foam according to claim 2, in particular, even if the high-temperature foamed board immediately after extrusion is rapidly cooled to below the glass transition temperature, uneven cooling or cooling failure hardly occurs. The surface can be finished neatly because wrinkles and tears are unlikely to occur due to variations in foaming ratio and crystallinity.
[0019]
Next, according to the method for producing a biodegradable polylactic acid mannequin according to the invention described in claim 5, in particular, the biodegradable polylactic acid mannequin having a dense cell and excellent elasticity and resilience is provided. Can be provided.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
The contents of the present invention will be described in detail below.
[0021]
The biodegradable polylactic acid foam board used for secondary molding the manikin made of the biodegradable polylactic acid of the present invention,
(1) a step of dry blending a foaming agent, a lubricant and a nucleating agent into biodegradable polylactic acid pellets dehumidified and dried at 45 to 60 ° C .;
(2) The obtained mixture is subjected to extrusion foaming into a long shape under a cylinder temperature condition of 130 to 190 ° C. and a die temperature condition of 110 to 170 ° C.
(3) a step of pressing with a forming roll held at 50 ° C. or lower;
(4) Next, a step of continuously drawing with a take-up device and cutting to an appropriate length;
It was manufactured by the method which has this.
[0022]
The biodegradable polylactic acid pellets are dried in a hot air dryer at 40 ° C. for about 5 to 6 hours and at 60 ° C. for about 1.3 to 5 hours. When the drying temperature is 40 ° C. or less, the polylactic acid pellets are not sufficiently dried even after continuous drying for a long time (because the moisture content is too high). There is a tendency that streaks are formed, and furthermore, the obtained foam itself tends to be brittle. On the other hand, when the drying temperature is 60 ° C. or higher, the polylactic acid pellets stick to each other in the hopper so that they cannot be extruded and foamed, or the foam itself becomes hard and brittle. is there.
[0023]
Moreover, it is necessary to dry the polylactic acid pellets so that the moisture content is in the range of 10 to 250 ppm. When the moisture content is 10 ppm or less, so-called “meani” tends to occur on the surface of the foam. When the moisture content is 250 ppm or more, as described above, moisture bubbles and vertical There is a tendency that streaks are formed, and furthermore, the obtained foam itself tends to be brittle.
[0024]
The water content of the polylactic acid pellets tends to affect the surface shape of the foamed board obtained by foaming. When the water content of the polylactic acid pellets is 75 to 250 ppm, a biodegradable foam board having deep drawing secondary molding processability formed into a flat surface with a clean surface can be formed and provided. In particular, when the water content of the polylactic acid pellets is about 10 to 75 ppm, a biodegradable foam board having an embossed surface shape can be molded with good reproducibility, and deep drawing secondary molding processing can be performed. However, it is possible to form a secondary molded product that retains the embossed surface shape as it is.
[0025]
More specifically, the inorganic foaming agent includes sodium bicarbonate, ammonium bicarbonate, ammonium carbonate, sodium borohydride, an azide compound, and the like. Organic foaming agents include azo compounds represented by azodicarbonamide and azobisisobutyronitrile, sulfonyl hydrazide compounds represented by oxysbenzenesulfonyl hydrazide, and nitroso compounds represented by dinitrosopentamethylenetetramine. Can be exemplified. These foaming agents may be used alone or in combination of two or more thereof, but when an azo compound-based foaming agent is used, the cells are dense and have excellent elasticity and resilience. A biodegradable foam board can be produced and provided.
[0026]
The mixing ratio of the foaming agent is 0.2 to 2.0 parts by weight, preferably 0.5 to 1.2 parts by weight, based on 100 parts by weight of the polylactic acid resin. Needless to say, the amount of the foaming agent used is an amount necessary to obtain a desired expansion ratio.
[0027]
Next, in the step (2), the dried polylactic acid pellets are melted in a cylinder and then extruded and foamed into a long shape from a die. Upon exiting the die, the plate-like extrudate expands to a certain magnification depending on the resin temperature, die shape, and the like. A suitable temperature condition of the cylinder is 130 to 190 ° C., and a temperature of the die is 110 to 170 ° C., preferably 140 to 170 ° C. As the die, for example, a T-die, a circular die, or the like can be used.
[0028]
Since corrugation (waving) tends to occur on the surface of the foam obtained by opening it to the atmosphere from the die, the foam itself immediately after extrusion is subjected to a waving process, and the resin itself has adhesiveness. Therefore, it is preferable to mold the foam while pressing it with a cooling roll. A biodegradable polylactic acid foam that is the final product when it is continuously formed by a take-up device while being cooled by a plurality of cooling rolls and cut into a desired size and shape by an appropriate cutting means having a blade, for example. Can be manufactured. In addition, you may employ | adopt the structure which passes the inside of a water tank and cools, after giving a corrugation process with respect to the foam immediately after extrusion, pressing with a cooling roll and finishing the surface beautifully.
[0029]
The density of the biodegradable polylactic acid foam board thus produced is preferably 0.5 to 1.05 g / cm ³ . When the density exceeds 1.05 g / cm ³ , the weight of foam board materials and mannequins can be reduced, but it is difficult to form the foam board, and it is difficult to finish the surface with tears and wrinkles during secondary molding. Furthermore, it tends to be difficult to give the mannequin or the like sufficient strength. If the density is lower than 0.5 g / cm ³ , the amount of resin used is large, so it is excellent in strength, but it is difficult to reduce the weight, or it is a foam board, so it cannot obtain the special surface characteristics obtained. Tend.
[0030]
The foam board for molding the mannequin or the like of the present invention preferably has a thickness of about 0.5 to 4.0 mm. A plate-like foam thinner than 0.5 mm is extremely difficult to manufacture, and even if it can be manufactured, there are few bubbles in the foam, and the excellent properties of the foam, such as heat insulation and weight reduction, may not appear sufficiently. This is because, for example, tearing may occur during vacuum forming, and the mannequin, which is the final product, cannot hold sufficient strength. If the thickness is more than 4.0 mm, it is difficult to form a plate-like foam sheet, and wrinkles are likely to occur during sheet forming. When the thickness of the foamed sheet material is 1.5 to 3.5 mm, it does not cause a drop-down (disappears excellent properties as a foam) by a known method such as a vacuum forming method or a pressure forming method. It is preferable because it can be molded into various secondary processed products without losing the biodegradable characteristics.
[0031]
Needless to say, an anti-scratch agent, a pigment, an antioxidant, a weather resistance improver, an antistatic agent and the like can be contained.
[0032]
According to the mannequin etc. of each claim, since it has biodegradation characteristics, it not only helps to solve the problem of dust, but also makes full use of the characteristics of foam board material, with screws It can be easily assembled and disassembled, and it can finish the surface cleanly with a texture that closely resembles human skin without any post-painting such as matting, and the surface has an appropriate anti-slip action The product is comfortable to touch, and the product does not slip, distort or slip off, and the fabric such as clothing can be easily fixed with focus, and the product has the desired appropriate strength.
[0033]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.
[0034]
A mixed pellet obtained by mixing 20 parts by weight of recycled “Lactron 700DA” with 100 parts by weight of polylactic acid virgin pellets (trade name “Lactron 700DA”) purchased from Kanebo Synthetic Co., Ltd. in a hot air dryer at 60 ° C., 3.0 After drying for a period of time, 100 parts by weight of the obtained dried pellets were drive-blended with 0.8 parts by weight of “DS # 25”) as a blowing agent and 0.5 parts by weight of talc as a nucleating agent, and the resulting mixture A T-die 2 having a clearance of 0.9 mm was attached to an extrusion diameter of 130φ, and extrusion foaming was performed into a long shape under a cylinder temperature condition of 130 to 190 ° C and a die temperature of 145 to 155 ° C. “DS # 25” used as a foaming agent is manufactured by Eiwa Chemical Co., Ltd., and is an azo compound-based composite foaming agent composed of azodicarbonamide and oxybisbenzenesulfonyl hydrazide.
[0035]
Since corrugation (waving) tends to occur on the surface of the obtained foam, immediately after the foam is subjected to a wave treatment, it is pressed with a cooling roll cooled to 35 ° C. Process into foamed board and if necessary pass through water bath and cool. And if it shape | molds continuously with a take-off apparatus, cooling with a some cooling roll, and cut | disconnects to the desired dimension shape with a cutter, the biodegradable polylactic acid foam which is a final product can be manufactured.
[0036]
The foam thus produced needs to have a density of 0.5 to 1.05 g / cm ³ . When the density exceeds 1.05 g / cm ³ , there is a tendency that thermal insulation and weight reduction, which are excellent characteristics of the foam, do not appear sufficiently because the number of bubbles in the foam is small, and the density is 0 If it is lower than 0.5 g / cm ³ , the secondary work moldability tends to be remarkably lowered because of the excessive bubble content in the foam.
[0037]
It is preferable that the thickness of the manufactured foam is 1 to 8 mm. Foam thinner than 1 mm is extremely difficult to produce, and even if it can be produced, there are few bubbles in the foam, heat insulation and weight reduction often do not appear sufficiently, and foam thicker than 8 mm This is because it is difficult to perform extrusion foam molding so that the thickness is uniform.
[0038]
In addition, even after adopting a configuration in which the foam immediately after foam extrusion is subjected to a wave removal treatment, pressed with a cooling roll to finish the surface neatly, and then cooled while being pressed with a cooling roll, the surface remains A beautiful long foam can be produced.
[0039]
1 is an exploded perspective view of a body according to a first embodiment of the present invention.
[0040]
In the figure, a body 10 is for displaying ladies' clothing, and a front main body 1 and a rear main body having irregularities imitating the surface state of a human body by a vacuum molding method using a polylactic acid foam board. 2 and 1 and 2, both necks 1 and 2 are fixed with polylactic acid fasteners 3 at the necks, and the ribs on both sides via polylactic acid arm joints 4. It is mounted and fixed with screws by a transformer screw 5, and a seat plate 6 is attached to the lower surface thereof. When used for display or the like, it is detachably attached to the column 8 of the support base 7 with a tap screw 9. That is, the front main body 1 and the rear main body 2 can be freely assembled and disassembled.
[0041]
The front main body 1 and the rear main body 2 are obtained by secondary molding of a polylactic acid foam board material having a thickness of 2 mm, and the peripheral end portions of both are formed in dimensions that can be overlapped with each other. As a molding method, the foam board material is heated to a moldable temperature by a heater part of a molding machine. The heated foam board material is evacuated on the molding die, the die and the board material are brought into close contact with each other, then cooled, and the sheet is taken out of the die shape to complete. A mold for molding the front body 1 and a mold for molding the rear body 2 are required. However, when the board material is heated, the mold and the board material are brought into close contact with each other, and a vacuum state is applied, the so-called compressed air vacuum molding method in which air pressure is applied to the board at the same time as the vacuum is more accurate. The shape can be reproduced.
[0042]
The peripheral end of the front main body 1 and the peripheral end of the rear main body 2 may be bonded and fixed with a known adhesive to be integrated. When a plurality of front main bodies 1 ′, 1 ″,... Having dimensions and shapes that can be overlapped with the peripheral edge of the rear main body 2 and having different surface states are prepared, the rear main body 2 is used in common. Therefore, the design of the body 10 having different surface states of the front main bodies 1 ', 1 ",... Can be easily changed, which is extremely suitable.
[0043]
In addition, since the body 1 is formed in half in the longitudinal direction of the front main body 1 and the rear main body 2, as shown in FIG. 2, a plurality of front main bodies 1 and a plurality of rear main bodies 2 are overlapped to form a band. It can be bundled together with a string or string, etc., and this makes it compact without being bulky, so that the storage space during transportation and storage can be reduced.
[0044]
In addition, the mannequin was molded into a plate-like front body and a rear body half, and the front body and the rear body were connected.
(1) Since it is hollow and lightweight, handling such as transportation and movement is easy, and even if it falls down, it is safe without injury, etc. (If a three-dimensional mannequin is formed, it is bulky, transported, It was very inconvenient to move),
(2) When you want to change only the shape of the front body according to the user's needs, for example, you can select only the front body and use the same common rear body, so it can be provided at a lower cost.
(3) When transporting and storing, the front and rear bodies are reversed and overlapped so that the volume can be halved (if the mannequin is formed in three dimensions. Needed a large storage space). However, after assembly is completed at the factory and integrated so as not to be separated, it may be shipped.
[0045]
Next, the half-broken front body 1 (FIG. 3) having a hook 11 on the neck corresponds to what is called a “relief” or the like by those skilled in the art. And can be used for the purpose of exhibiting accessories.
[0046]
FIG. 4 schematically shows a method for manufacturing the mannequin 100 by assembling the above-described body.
[0047]
In the figure, the mannequin 100 includes a chest upper part 21 having a head, a right arm part 22, a left arm part 23, a torso part 24, a waist part 25 having a right leg part, and a left leg part 26. In this case, the front body and the rear body, which are produced by vacuum forming or pressure vacuum forming from the above-described foamed board material, are integrated with an adhesive.
[0048]
According to the mannequin 100 configured in this way, for example, several types of poses such as legs and arms are prepared, and if necessary ones are selected and incorporated, a mannequin with various poses can be formed. Can do.
[0049]
Finally, when the mannequin 100 was crushed with a hammer and composted, it was found that it did not retain its form in 1 to 2 months and had good biodegradability.
[0050]
【The invention's effect】
As described above, according to the mannequin made of biodegradable polylactic acid foam described in each claim,
(1) Since the mannequin itself is biodegradable and processed in the natural circulation in the soil, it is gentle on the global environment,
(2) The structure has a dense and uniform wall thickness, elasticity, resilience, and excellent impact resistance and good dimensional stability.
(3) Furthermore, it can be easily assembled and disassembled with screws while fully utilizing the characteristics of polylactic acid foam board material.
(4) The surface has a suitable anti-slip action and feels good, and the product does not slip and distort or slip off.
(5) In addition, since the whole is lightweight, handling such as transportation and movement is easy,
(6) Even if it falls, it can be handled safely with little injuries.
(7) In addition, clothing and other fabrics can be easily pinned and fixed, making it possible to recycle end products that are damaged or no longer needed or products that are out of specification at the time of molding, from the viewpoint of effective use of resources and environmental conservation. Is also advantageous,
Thus, it is possible to obtain extremely effective effects.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view schematically showing a body according to an embodiment of the present invention.
2 (a) and 2 (b) are perspective views shown for explaining the advantages obtained when the body of FIG. 1 is transported and stored.
FIGS. 3A and 3B are perspective views schematically showing an example of the relief of the present invention.
FIG. 4 schematically shows a method for producing a mannequin doll by assembling a body according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Front part main body 1 ', 1 "... Front part main part 2 ... Rear part main part 3 ... Fastener 3' ... Fastener 4 ... Arm part connector 5 ... Transformer screw 6 ... Support stand 7 ... Post 8 ... Tap screw 9 ... Transformer Screw 10 ... Body 11 of the present invention ... Hook 21 ... Chest upper part 22 having a head ... Right arm part 23 ... Left arm part 24 ... Body part 25 ... Waist part 26 having right leg part ... Left leg part 100 ... In accordance with the present invention Mannequin doll

Claims (5)

In the mannequin made of biodegradable polylactic acid foam, the biodegradable polylactic acid foam board having a thickness of 0.5 to 5 mm is molded into a partial shape of at least the front surface of the human body.
The biodegradable polylactic acid foam board is obtained by subjecting a mixture obtained by dry blending a foaming agent, a lubricant and a nucleating agent to biodegradable polylactic acid pellets dried at 45 to 60 ° C., and a cylinder temperature condition of 130 to 190. After extrusion foaming into a long shape at a temperature of 110 ° C. and a die temperature condition of 110 to 170 ° C., and after being waved, it is pressed with a forming roll held at 50 ° C. or less,
A manikin made of a biodegradable polylactic acid foam, wherein the biodegradable polylactic acid pellets have a water content of 10 to 250 ppm. The manikin made of a biodegradable polylactic acid foam according to claim 1, wherein the biodegradable polylactic acid resin pellet contains 1% by weight or more of amorphous biodegradable polylactic acid. 3. The biodegradable polylactic acid foam mannequin according to claim 1, wherein the biodegradable polylactic acid foam board has a density in the range of 0.5 to 1.05 g / cm <3>. In the biodegradable polylactic acid mannequin,
The said foaming agent is mix | blended in the ratio of 0.2-2.0 weight part per 100 weight part of said biodegradable polylactic acid pellets, The biodegradation in any one of Claims 1-3 characterized by the above-mentioned. Mannequin made of water-soluble polylactic acid. A biodegradable polylactic acid foam board having a thickness of 0.5 to 5 mm is a method for producing a mannequin made of biodegradable polylactic acid foam molded into a partial shape of at least the front surface of a human body,
The biodegradable polylactic acid foam board is obtained by subjecting a mixture obtained by dry blending a foaming agent, a lubricant and a nucleating agent to biodegradable polylactic acid pellets dried at 45 to 60 ° C., and a cylinder temperature condition of 130 to 190. After extrusion foaming into a long shape at a temperature of 110 ° C. and a die temperature condition of 110 to 170 ° C., and after being waved, it is pressed with a forming roll held at 50 ° C. or less,
A method for producing a manikin made of a biodegradable polylactic acid foam, wherein the biodegradable polylactic acid pellets have a water content of 10 to 250 ppm.

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