JPS59142120A - Manufacture of baglike body used as fender or the like - Google Patents

Abstract

PURPOSE:To produce a lightweight baglike body excellent in durability, by making a bag body of woven fabric or knitted cloth that allows steam to pass through, filling the bag body with thermoplastic foamable resin particles, and expanding them by steam in the bag. CONSTITUTION:A woven fabric or knitted cloth has been fabricated in such a way that the coarseness allows steam to permeate through it and is made into a cylinder having openings at the opposite ends. A rope 31 having stop rings 30, 30' connected thereto at the opposite ends is inserted in the cylinder with the opposite ends outside the cylinder, and the lower opening of the cylinder is closed, for example by a mouth piece 11 to form a bag 10. A polyolefin resin such as a polyethylene, etc. is used as nuclei, a styrene type monomer and a catalyst for polymerizing said monomer are absorbed into said nuclei, and the styrene is polymerized to form graftbonds to produce foamable resin particles (a). Then a foaming agent is added to foam them to prepare prefoamed particles, and the bag body 10 is filled with the prefoamed particles. After the upper opening is closed, for example by a mouth piece 11 with the stop ring 30 outside, the bag body is placed in a steaming chamber 40. Steam is allowed to permeate into the bag body 10, and heat the particles (a) to expand them, so that a foamed body 20 is formed to produce the desired baglike body 10.

Description

[Detailed Description of the Invention] This invention relates to a method for manufacturing a bag-like body used for fenders, etc.
More specifically, the present invention provides a method for manufacturing a bag-like body that is lightweight and has excellent durability, and is particularly suitable for use in fenders, floats, and the like.

Conventionally, the method of manufacturing ship fenders using synthetic rubber has been popular, but the fenders manufactured by this method have heavy chains and are difficult to handle such as transportation. In addition to being inconvenient, it also had drawbacks such as being expensive.0 For this reason, instead of the above method, a foam core material was used as the core material, and the method was
Attempts have been made to use a method of coating a resin such as cFRP (fiber-reinforced plastic) or a method of attaching synthetic fibers to the surface with an adhesive to integrate them.

However, not only are the processes involved in both manufacturing methods complicated, but the fender materials manufactured using these methods also tend to have resins, synthetic fibers, etc. that easily peel off due to oil adhesion, impact, etc. It had the disadvantage of poor durability.

Furthermore, when manufacturing floats for use in fishing nets, oil fences, etc., attempts have been made to use a method using foam as the core material, similar to the method described above, but in this case as well, the manufacturing process is complicated and , the float produced by that method had the same drawbacks as the fender described above.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional method of manufacturing bag-like bodies used for fenders, and it provides a bag for use in fenders, etc. that is lightweight and has excellent durability. The object of the present invention is to provide a method for manufacturing a shaped body.

The manufacturing method according to the present invention includes filling thermoplastic foamed resin particles into a steam-permeable bag made of woven or knitted fabric, and thermally expanding the particles with steam to form a foam. It is characterized in that the bag is filled with foam.

Hereinafter, using this invention, FIG. 1 (perspective view) and FIG. 2 (
A bag-like body (1) as shown in the cross-sectional view), that is, a bag body (1 (1
Figures 8 to 'f show the main manufacturing process in the case of manufacturing a bag-like body (1) whose interior is filled with foam material.
This will be explained in detail based on FIG.

First, prepare a bag made of woven or knitted fabric such as synthetic fibers.The weave of the woven fabric or the fine details of the knitted fabric are such that they do not allow the foamed resin particles (, ) described later to pass through, but they do allow steam to pass through. The bag is woven or knitted to a certain degree of roughness.
Sill was originally a cylindrical shape with both ends open, into which a rope c with a stopper ω- connected to the upper and lower ends was inserted.
31) through the bag body (101), and then
With the rope G11l protruding, the lower end opening is closed by tightening it with a cap αυ, etc., so that only the upper end is left open (see Fig. 8). When the upper end opening of 101 is squeezed and closed with a cap (111, etc.), the stopper (2) is designed to protrude.

Now, the bag 00, which is open only at the top end, is filled with foamed resin particles (a) (see FIG. 4).

The foamed resin particles (,) are made of polyolefin resin such as polyethylene or polypropylene.
By absorbing a styrene monomer and a catalyst for polymerizing the monomer into the core, and polymerizing the styrene monomer within the core, a polyolefin resin and a polystyrene resin are at least partially graft-bonded (
The graft bonding portion is 1% or more of the total amount of polyolefin resin and polystyrene resin.

Then, the foamed resin particles (,) are made into foamable resin particles (i'9i product name: Piocelan (grafting rate =
4%), manufactured by Sekisui Plastics Co., Ltd.), and after foaming the particles to form pre-expanded particles, they are filled into the bag [101] as described above. These foamed resin particles (a
) is used by heating and fusion bonding as described below, but the resin has elasticity, restorability, □i1+ resistance V'cN>
As described above, the bag opening 01 filled with foamed resin particles (,) is opened at the upper end opening with the stopper ω protruding. After closing it by squeezing it with a cap (Ill etc.), open the steam chamber (
4 (accommodated in υ (see Figure @6). Steam is supplied to the steam chamber (inside the shaft from a supply port (not shown), but the steam moves in the direction of the arrow in the figure and flows into the bag body. Infiltrate into Oα,
The foamed resin particles (,) filled therein are heated and expanded, and the foamed resin particles (2) are heated and expanded as shown in Figure 2.
))) The bag-like body (1) is manufactured by filling the inside of the bag body 001.

Note that this method can also be applied to the production of a plurality of bags arranged in series as shown in FIG. In this case, the connecting portions of each bag (1 (11) may be made to communicate with each other, and the communicating portions may also be filled with foam.

In addition, as the material for the foamed resin particles (,), in the above-mentioned examples, a material in which poly, olefin resin and polystyrene resin were partially grafted was used, but other thermoplastic foams such as polypropylene, polystyrene, etc. Resin particles may also be used.

It can be applied to various applications such as fishing nets and oil fence floats.

As detailed above, when producing a bag-like body for use in fenders, etc. by the method of the present invention, the bag formed of woven or knitted fabric is filled with foam.
A bag-like body that is lightweight and easy to transport and handle can be manufactured. In addition, to fill the bag with foam,
Since the thermoplastic foam resin particles filled in the bag are thermally expanded as they are to form a foam, the foam can be cut. Furthermore, the produced bag-like body can reliably prevent the foam from chipping, etc., and has an excellent shape-maintaining effect.
It is particularly suitable for use in fenders that are repeatedly subjected to strong pressure.

Therefore, it can be said that the present invention provides a method for easily manufacturing a bag-like body that is lightweight and has excellent durability, and is particularly suitable for use as a fender.

[Brief explanation of the drawing]

The figure illustrates an embodiment of this starting point 1, and the first
The figure is a perspective view showing a bag-like body according to the present invention, FIG. 2 is a cross-sectional view, FIGS. It is a perspective view which shows the example of a change of a shape body. (1)...bag-like body, (101...bag body,...foam S field αto...retaining ring, (a)...thermoplastic foamed resin particles. Patent applicant Sekisui Kaseihin Kogyo Co., Ltd. Patent Attorney Hirokatsu Kamei Diagram 1

Claims (1)

[Claims] 1. A steam-permeable bag made of woven fabric or silk fabric is filled with VC thermoplastic foamed resin particles, which are thermally expanded with steam to form a foam; A method for manufacturing a bag-like body used for fenders, etc., characterized in that the bag body is enriched in a step. 2. The method for producing a bag-like body used for fenders, etc., according to claim 1, wherein the foam is made of a resin in which a polyolefin resin and a polystyrene resin are at least partially graft-bonded.