JP2002209690A - Transparent biodegradable mannequin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mannequin having biodegradability, having excellent heat resistance and transparency, and having a beautiful finish surface. SOLUTION: A biodegradable polylactic acid pellet having a moisture content of not more than 100 ppm is extruded under a cylinder temperature condition of 150 to 210 deg.C and a die temperature condition of 150 to 180 deg.C, and then, secondary fabrication is performed by using a transparent board having a thickness of 1 to 5 mm pressed by a molding roller held at 100 deg.C or less as a raw material, and the whole surface is transparent for seeing-through.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biodegradable and transparent mannequin whose entire surface is transparent.

[0002] In the present specification, a "mannequin" is a simulated molded body of the whole human body to which arms and legs can be detachably connected so that clothes and the like can be attached and detached.
Partially simulated molded body of the human body, more specifically, simulated half body,
The so-called "body", which is a simulated molded body such as a head simulated molded body, a chest simulated molded body, a waist simulated molded body, a leg simulated molded body, an arm simulated molded body, and a half-split type of a human body simulated molded body. It includes all so-called “reliefs” used to display products such as underwear and accessories, and all sales promotion tools such as objects.

[0003]

2. Description of the Related Art As a conventional mannequin, there is a molded body made of plastic. In addition, foams made of plastics, especially foams made by an extruder, include foamed polystyrene, foamed polyethylene, foamed polypropylene, and the like. These are excellent in secondary molding processability in addition to light weight, heat insulation, soundproofing, cushioning, and the like. Is widely used in various fields. However, conventional mannequins
Since it is hardly decomposed in the natural environment, it accumulates in the natural world, causing landfill shortages, soil, river, and marine pollution.
It is a major social problem on the environment and ecosystem. On the other hand, even if an attempt is made to recover and reuse the material, it is bulky and the recovery cost is high. Further, there are problems such as damage to the incinerator at the time of incineration, generation of toxic gas, etc., so that recovery and regeneration are extremely difficult.

[0004] As one of such environmental load suppressing means, it is desired to develop a biodegradable polymer which is decomposed by microorganisms in the soil or water, incorporated into a natural material circulation system, and does not pollute the environment. As these biodegradable polymers, various synthetic and natural polymers are known, including polyhydroxybutyrate, polylactic acid, polycaprolactone, cellulose, chitosan, starch and the like. In addition, a technology relating to a foam such as a natural product mainly comprising a polysaccharide such as corn starch or a derivative thereof has been disclosed (for example, Japanese Unexamined Patent Publication No.
39377, etc.).

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 such as copolymers of polylactic acid and ε-caprolactone. Regarding the foam of the polyester, for example, JP-A-4-304244, JP-A-5-140361, JP-A-6-287347
And Japanese Patent Publication No. 5-508669.

[0006]

However, conventional lactic acid-based polyester foamed mannequins, although excellent in biodegradability, are opaque and have poor elasticity and restoring power.
It has the drawback of being brittle against mechanical shock, and the copolymer of lactic acid and ε-caprolactone is relatively flexible, but has poor heat resistance, so a stable molded product can be obtained during secondary molding. There is a problem that it is difficult to use it for a limited purpose.

The present invention has been made in view of the needs of customers who provide a mannequin that is biodegradable, transparent on the entire surface, and can see through the inside. Therefore, an object of the present invention is to provide a mannequin having not only biodegradability but also excellent heat resistance and transparency, and a clean finished surface.

[0008]

In order to achieve the above-mentioned object, a means adopted by the present invention is to prepare a biodegradable polylactic acid pellet having a water content of 100 ppm or less by a cylinder temperature condition of 150 ppm.
Extruded at ~ 210 ° C and die temperature conditions of 150-180 ° C, and then subjected to secondary molding using a transparent board with a thickness of 1-5mm formed by pressing with a forming roll maintained at 100 ° C or less as a raw material. The gist is a transparent mannequin whose entire surface is transparent.

According to the present invention, the polylactic acid pellet has a water content of 1
Because it is an essential constituent requirement to be prepared in advance to 00 ppm or less, even if the high-temperature board immediately after extrusion is rapidly cooled to a glass transition temperature or less, uneven cooling or insufficient cooling hardly occurs.
Wrinkles and tears caused by variation in crystallinity hardly occur. That is, it is possible to manufacture a transparent board having a clean flat surface and a thickness of 1 to 5 mm having excellent deep drawing secondary formability. In addition, this transparent board can be subjected to deep drawing secondary molding while maintaining biodegradability and excellent heat resistance and transparency.

Further, the mannequin according to the present invention is obtained by subjecting a transparent board to a deep drawing secondary forming process by, for example, a vacuum forming method and the like, and the entire surface is transparent enough to allow the inside to be seen through. A light bulb for decoration, artificial flowers, or various decorations can be accommodated inside the mannequin formed by joining the half-split types. In other words, the decoration can be neatly arranged when arranged in a store, and the commercial value thereof is surely improved.

Further, the mannequin according to the present invention can be landfilled or incinerated even when it is discarded, which helps to solve environmental problems.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a simulated body according to the present invention will be described in more detail with reference to examples, but these are representative examples and do not depart from the gist thereof. However, the present invention is not limited by the following examples.

The "mannequin" according to the present invention can be manufactured by the following manufacturing method. First, the biodegradable polylactic acid pellets are mixed with 45 to 6 so that the water content is 100 ppm or less.
After drying at 0 ° C., it is melted in a cylinder (cylinder temperature condition 150 to 210 ° C.), and die temperature condition 1
It is extruded at 50 to 180 ° C., preferably 130 to 150 ° C., and immediately pressed by a forming roll maintained at 100 ° C. or lower to produce a transparent board having a thickness of 1 to 8 mm. As the dice, for example, a T-die, a circular die, or the like can be used.

If necessary, while being cooled by a plurality of cooling rolls, it is continuously formed by a take-off device and cut into a desired shape by a suitable cutting means having, for example, a blade.
You may keep it.

The biodegradable polylactic acid pellets are heated in a hot air drier at 40 ° C. for about 5 to 6 hours and at 60 ° C. for 1.3 to 1.3 hours.
Drying is performed for about 5 hours. If the drying temperature is 40 ° C. or lower, the dried state of the polylactic acid pellets becomes insufficient even after continuous drying for a long time (because the moisture content is too high). , The transparency becomes poor, and the obtained board itself tends to be brittle. On the other hand, if the drying temperature is 60 ° C. or higher, there is a tendency that the polylactic acid pellets stick together in the hopper to form a lump and cannot be extruded, or the board itself becomes hard and brittle.

Further, the polylactic acid pellets must be dried so that the water content thereof is 100 ppm or less. If the water content is 100 ppm or more, as described above, water bubbles and vertical streaks are formed on the extruded board,
Transparency is poor, and the resulting board itself tends to be brittle.

The water content of the polylactic acid pellets tends to affect the surface shape of the board obtained. A polylactic acid pellet having a water content of 100 ppm or less, having a deep drawing secondary formability formed into a clean and flat surface, and a transparent biodegradable board can be formed.

Further, it is possible to form into various secondary processed products by a known method such as a vacuum forming method and a pressure forming method without causing drawdown and without losing biodegradable characteristics. The thickness of the transparent board,
It is preferably from 1 to 8 mm, more preferably from 1 to 5 mm. Boards thinner than 1 mm are extremely difficult to manufacture, 8 m
If it is thicker than m, it is difficult to extrude it so that its thickness becomes uniform.

Then, the obtained transparent board is subjected to a deep drawing secondary molding process as a raw material, taken out of the mold, and if necessary, cut off the burr-like portion protruding from the female mold, to obtain a half-split type. Mannequins (molded bodies) can be manufactured.

Next, for example, a hollow mannequin (molded body)
Using a female mold adapted to the shape of the front of the human body, the transparent board is subjected to a deep drawing secondary molding process according to the manufacturing method described above, and a half-split type adapted to the shape of the front of the human body A molded body is produced. Similarly, using a female mold adapted to the shape of the back of the human body, a half-split type molded body adapted to the shape of the back of the human body is produced. A hollow mannequin can be produced by joining the outer peripheral edges of the obtained half-split type molded bodies and bonding them with an adhesive.

It is needless to say that if artificial flowers for decoration and various decorations are provided before bonding with the adhesive, the mannequin will have artificial flowers for decoration and other decorations inside. However, it goes without saying that it is possible to contain an anti-measuring agent, a pigment, an antioxidant, a weather resistance improving agent, an antistatic agent and the like.

Example 1 The present invention will be described more specifically with reference to examples, but the present invention is not limited thereto.

Polylactic acid virgin pellets purchased from Kanebo Gosen Co., Ltd. (trade name "Lactron 700D")
A)) was dried with a hot air drier at 60 ° C. for 3.0 hours, and then the clearance was 0.9 m to an extrusion diameter of 130φ.
m T-die 2 is attached, and cylinder temperature condition 15
Extruded at 0 to 210 ° C. and at a die temperature of 150 to 180 ° C., preferably 130 to 150 ° C.
A transparent board having a thickness of 1.5 mm was manufactured by pressing with a forming roll maintained at a temperature of not more than ° C.

Next, a pair of dies corresponding to the respective simulated molded bodies, which are a female mold adapted to the shape of the front of the human body and a female mold adapted to the shape of the back, are prepared, and the transparent board is vacuum molded. A deep-drawing molding process was performed by the method to produce a half-split type molded body adapted to the shape of the front of the human body and a half-split type molded body adapted to the shape of the back of the human body.

Then, the outer peripheral edges of the obtained half-split type molded body are joined and bonded with an adhesive, whereby a hollow mannequin can be manufactured.

It should be noted that a head simulation molded body, a chest simulation molded body,
Other simulation moldings such as waist simulation moldings, leg simulation moldings, arm simulation moldings, and a female mold adapted to the front shape,
A pair of dies corresponding to each of the simulated molded bodies including a female mold adapted to the shape of the back surface are prepared, and can be manufactured in the same manner by operating as described above. The selection of the dividing position of each molded body, the design, the dimensions, and the like are all matters that can be appropriately changed in design.

Further, a whole body simulated molded body (a so-called mannequin doll) can be formed by assembling the molded bodies with known connecting means interposed therebetween.

[0028]

As described above, the mannequin according to the present invention is required to be prepared in advance so that the water content of the polylactic acid pellets is 100 ppm or less.
Even if the high-temperature board immediately after extrusion is rapidly cooled to the glass transition temperature or less, uneven cooling and insufficient cooling hardly occur, and there is no wrinkle or tear caused by variation in crystallinity, so the surface is clean and flat. A transparent board having a deep draw secondary forming processability can be manufactured, and the transparent board has a degree of transparency such that it can be seen through a deep drawn secondary forming process by a vacuum forming method or the like as a raw material. Therefore, even if a decoration light bulb, artificial flowers, or various decorations are accommodated inside the mannequin, they can be seen through.

That is, since the product can be neatly decorated when placed in a store, the commercial value can be surely improved, and even when it is damaged or no longer needed, it can be landfilled or incinerated to protect the environment. It is extremely advantageous in terms of effectiveness, for example, it is advantageous in terms of surface.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 31:00 B29L 31:00 F term (Reference) 4F207 AA24 AC01 AH81 AR06 KA01 KA17 KK64 KK76 KM14 KM15 KM16 KW26 4F208 AA24 AC01 AH81 AR06 MA05 MB01 MC10 MG22 MH06 MH10 MK08 MK13 MK15 MW02 MW26

Claims (1)

[Claims] 1. A biodegradable polylactic acid pellet having a water content of 100 ppm or less is prepared by subjecting the pellet to a cylinder temperature condition of 150 to 210.
Manikin extruded at 150 ° C. and die temperature conditions of 150 to 180 ° C., and then pressed by a forming roll maintained at 100 ° C. or less, and subjected to secondary molding using a transparent board having a thickness of 1 to 5 mm as a raw material. A biodegradable mannequin, wherein the entire surface of the mannequin is transparent so that the inside can be seen through.