JPH068771Y2 - Plastic chopsticks - Google Patents

Description

[Detailed Description of the Invention] "Field of Industrial Application" This invention relates to a plastic chopstick that can be repeatedly used.

"Prior art" As the chopsticks that can be used repeatedly, there are many coated chopsticks that use bamboo or wood as the core material and are coated with paint, but the drawback is that the paint may peel off after repeated use. there were. Therefore,
Plastic chopsticks that do not require painting have come to be used,
As a material, general-purpose resins such as styrene resin, which is relatively inexpensive and used in the household daily goods industry, are mainly used. These plastic chopsticks have the drawback of being easily broken, and they often break when used repeatedly for several months, but they can be provided at low cost,
Since it can be used for a while in ordinary households without noticeable trouble, no attempt has been made to use a new plastic material for chopsticks.

In addition, when using chopsticks repeatedly for lunch etc., boiling disinfection and disinfection using high temperature superheated steam are performed, but the plastic used for conventional chopsticks has a low heat resistant temperature, so boiling disinfection and superheated steam etc. It was melted or deformed by the high temperature disinfection used. Therefore, the prejudice that plastic chopsticks cannot withstand boiling sterilization and disinfection with high-temperature superheated steam has not led to the development of highly heat-resistant and breakable chopsticks.

"Problems to be solved by the device" This device solves all the drawbacks of conventional plastic chopsticks, that is, it does not bend or break and can be used repeatedly over a long period of time, and it is sterilized by boiling or overheated at high temperature. It provides durable chopsticks that will not melt or deform even when disinfected by steam.

"Means for Solving the Problems" The plastic chopsticks are formed of polyphenylene sulfide (hereinafter referred to as PPS) resin, and the direction of the fibers is set so that the reinforcing fibers such as glass fibers or carbon fibers are along the axial direction of the chopsticks. Align and mix in the resin that forms the chopsticks.

[Operation and Features] As described in Examples, since PPS resin has a high flexural modulus, chopsticks made of this resin are hard to bend and easy to use.
Moreover, the reinforcing fibers such as glass fibers or carbon fibers mixed in the resin in the same direction as the axial direction of the chopsticks act like reinforcing bars in concrete to improve the bending strength and make it difficult to break. Can be used repeatedly over a period of time. Furthermore, since this resin has a high heat resistance temperature, the chopsticks made from this resin will not melt or deform even when it is sterilized by boiling or sterilizing with high temperature superheated steam. Therefore, it is possible to perform high-temperature sterilization such as sterilization with high-temperature superheated steam, which was difficult with conventional plastic chopsticks, and can be used repeatedly over a long period of time not only in ordinary households but also in severe conditions such as lunch. Not with excellent features.

"Embodiment" An embodiment of the present invention will be described below with reference to the drawings.

The chopstick 1 is a PPS resin chopstick molded by injection molding, and a gate 2 which is an inflow portion of the molten resin at the time of molding.
Is provided on the top of the chopsticks 1. The gate 2 is not limited to this embodiment, and may be provided near the top or the tip of the chopstick 1. A large number of small irregularities are formed on the tip end side of the chopsticks 1 to form the non-slip portion 3. In the resin forming the chopstick 1, glass fiber is mixed as a reinforcing fiber 4 along the axial direction of the chopstick 1. This reinforcing fiber 4
Is mixed with the resin before forming the chopsticks, and during molding, when the molten resin in the molding die flows through the gate 2 to the tip of the chopsticks, the molten resin flows The reinforcing fibers 4 in the molten resin are aligned in the axial direction because they flow along the axial direction. Therefore, when the chopsticks are molded and the resin cools and solidifies, the reinforcing fibers 4 act like reinforcing bars in concrete in the resin forming the chopsticks to improve the bending strength. The reinforcing fiber 4 may be carbon fiber.

Table 1 shows the characteristics of PPS resin and general-purpose resins that have been conventionally used, extracted from the catalog data of resin manufacturers. Table 2 shows the company names and resin names of the referenced catalogues. Are added to show the correspondence between Table 1 and Table 2, and the rows with the same numbers correspond. The heat distortion temperature of is that without annealing.

The "bending strength" indicates the resistance to bending, the "bending elastic modulus" indicates the resistance to bending, and the "heat deformation temperature" indicates the heat resistance. In each case, the larger the numerical value of the test result of the test piece, the better.

As shown in Table 1, styrene resin and AS resin have low heat resistance temperature and cannot withstand even boiling sterilization performed even in general households. According to the catalog data, methacrylic resin also has a heat distortion temperature that is the limit to withstand boiling disinfection, and when steam sterilization using superheated steam, the temperature of the superheated steam blown into the sterilization tank is 130 ° C.
Some of them are above, and they cannot withstand steam sterilization. In addition, styrene resin, AS resin, and methacrylic resin all have insufficient bending strength, and chopsticks with a length of about 22.5 cm, which are often used for adult men, may break during use and may be repeated for a long time. It's difficult to use. Polycarbonate chopsticks can be used as heat-resistant chopsticks, but since polycarbonate has a low bending elastic modulus, it easily bends, and when used to tear grilled fish or when a large and hard object is sandwiched, the chopsticks bend and it is very difficult to use. Moreover, the high temperature sterilization using superheated steam or the like used for feeding may exceed the heat resistant temperature of polycarbonate.

The PPS resin containing the reinforcing fiber of the chopsticks of the present invention is tough, with a bending strength about 30% higher than that of AS resin and the like, and a bending elastic modulus having sufficient rigidity about twice that of polycarbonate. Moreover, since the reinforcing fibers are mixed in the chopsticks of the present application so as to be along the axial direction of the chopsticks, they are easy to use and durable because they are difficult to bend and bend. Further, the PPS resin containing the reinforcing fiber of the chopsticks of the present application can withstand the heat deformation temperature and the high temperature steam sterilization using superheated steam.
Since it is 260 ° C or higher, the chopsticks of the present invention can withstand steam sterilization and have outstanding features that can be used repeatedly over a long period of time not only in ordinary households but also in severe conditions such as lunch.

[Brief description of drawings]

 FIG. 1 is a partially cutaway perspective view of the chopstick of the present invention. 1 ... chopsticks 2 ... gate 3 ... non-slip part 4 ... reinforcing fiber

Claims (1)

[Scope of utility model registration request] 1. A resin for forming chopsticks in which the plastic chopsticks are made of polyphenylene sulfide (Polyphenylene Sulfide) resin, and reinforcing fibers such as glass fibers or carbon fibers are aligned in the axial direction of the chopsticks to form the chopsticks. Plastic chopsticks characterized by being mixed in.