KR20000073195A - FRP Light Pole for Tent and its Manufacturing Method - Google Patents

Abstract

PURPOSE: A light pole of glass fiber-reinforced plastic used in the tent for sports and leisure is provided, which improves structurally the flex strength and the split and reduces relatively thickness and weight to accomplish the lightening. A preparation is also provided, which is suitable for massive production. CONSTITUTION: A preparation of a light pole comprises the steps of : forming a first layer) by attaching a glass fiber thread (2a) impregnated with a resin to the periphery of mandrill (10) in the drawing direction of 0 degree ; forming a second layer by wrapping and attaching glass fiber tape (9) against/to the glass fiber thread (2a) in the perpendicular direction through a first guide ring (7a) in the entry of mold (5) ; forming a third layer by attaching a glass fiber thread (2b) impregnated with a resin to the periphery of the second layer in the drawing direction of 0 degree through a second guide ring (7b) in the entry of mold (5) ; and shaping by heat with drawing at the same time.

Description

Lightweight pole made of glass fiber reinforced plastic for tent and manufacturing method {FRP Light Pole for Tent and its Manufacturing Method}

The present invention relates to a lightweight pole made of glass fiber reinforced plastic (hereinafter referred to as FRP) for use in tents in the sports and leisure fields, and a manufacturing method suitable for mass production thereof.

Tents used in sports and leisure fields (climbing tents) are easily folded and transported when traveling by car or mountain. These tents have a number of tent poles that can be folded and retracted in multiple stages by fitting. Tent poles are generally made of light alloys and FRP made according to the pultrusion process.

Conventional FRP tent poles are thermally cured with continuous polyester molding after depositing unsaturated polyester resin compounds on glass fibers, and the glass fibers are oriented only in the drawing direction. That is, as shown in FIG. 4, the concentrated glass fiber yarn 51 is installed in a rack by a predetermined number of times, and is passed through the guide 52 to the resin impregnation tank 53 so that there is no tangling, and then the mandrel 54 and the hot plate. It enters into the metal mold 56 through the bushing 57 hole of the metal mold 56 with which 55 is provided, and is thermosetted. The thermosetting tent pole Pa is continuously drawn out by the drive unit 58 and cut to a predetermined length, and then the seam (joint) is assembled at both ends to obtain the finished product after cutting the cutting surface again. .

If the glass fibers are oriented only in the drawing direction, they are vulnerable to flexural strength. Tent poles mainly have flexural strength (bending strength), so if they are oriented only in the drawing direction, they tend to break when excessive bending occurs. Figure 5 shows the FRP tent pole (Pa) made by the above method it can be seen that all the glass fiber yarn is oriented only in the drawing direction (0 °). In order to increase the flexural strength of these tent poles, it is necessary to use many fiberglass yarns. However, the more glass fiber yarn is used, the more tent poles become thicker and heavier than necessary. This problem can be seen by looking at the number of strands of yarn used in the manufacture of conventional tent poles. In the case of 7.9, when forming 2,200Tex glass fiber 20 strands in which 20 to 23㎛ thick glass chambers are concentrated, it is necessary to obtain a thick tent pole because the thickness should be thick to 3.7mm to maintain proper bending strength. It is not there.

In order to compensate for this disadvantage, it may be possible to install a so-called winding facility having a function of winding the fiberglass yarn in a spiral direction. However, since the winding equipment is a production equipment for general FRP pipes, which is not suitable for mass production of tent poles, it is not economical when used as a production equipment for tent poles. Conventional tent poles are used for When producing 7.9 to 12.7 products, 15 to 20 lines are drawn for each unit. At this time, when the molding speed is 1m / min, it is possible to produce 1m × 60min × 24hr × 20line = 28,800m. However, when the winding equipment is installed, the width of the installation area usually takes up 600 ~ 800mm. There was a problem that can only be produced. Therefore, production volume can only be reduced to 1 / 15-1 / 20, and from the economical point of view, it can be concluded that it is impossible to produce tent poles by installing a winding facility.

An object of the present invention is to reduce the thickness and weight while structurally improving the flexural strength and splitting, which is a problem of the conventional FRP tent poles, to achieve the lightweighting of sports or leisure tents or simple tents, and furthermore, recycling in limited resources It is to minimize the consumption of difficult FRP.

1 is a manufacturing process diagram of an embodiment of the present invention.

Figure 2 is a cross-sectional perspective view of the lightweight pole of the present invention.

Figure 3 is a weight comparison graph between the lightweight pole of the present invention and a conventional tent pole.

Figure 4 is a conventional tent pole manufacturing process.

5 is a cross-sectional perspective view of a conventional tent pole.

<Explanation of symbols for the main parts of the drawings>

2a, 2b: glass fiber yarn, 4a, 4b: resin impregnation, 5: mold, 6: hot plate, 7: secondary guide, 7a: primary guide ring, 7b: secondary guide ring, 8: bushing, 9: Fiberglass tape, 10: Mandrel, 11: Drawing device, P: Lightweight pole, Pa: (traditional) tent pole, P1: First layer (glass fiber yarn 2a), P2: Second layer (glass fiber tape 9) , P3: third layer (glass fiber yarn 2b)

In order to achieve the above object, the present invention provides a tent pole (hereinafter referred to as a lightweight pole in the case of the present invention), the first layer attached to the circumferential surface of the glass fiber yarn impregnated in the resin at 0 ° in the drawing direction, The glass fiber tape made of the second layer wrapped and attached to the circumferential surface of the first layer at 90 ° orthogonal to the glass fiber yarn of the first layer, and the glass fiber yarn impregnated in the resin at 0 ° in the drawing direction. A third layer adhered to the circumferential surface of the second layer was formed in a pipe-molded structure.

The manufacturing method for obtaining a light pole having the structure described above, the glass fiber yarn impregnated in the resin is supplied to the outer surface of the mandrel through the bushing of the mold tip in the drawing direction, and the glass fiber tape made of woven fabric is not impregnated with the resin. It is supplied to be wrapped in the orthogonal direction on the outer surface of the glass fiber yarn of the resin impregnation through the primary guide ring of the mold inlet in the state, and at the same time the glass fiber yarn impregnated in the resin through the secondary guide ring of the mold inlet What is made of a series of processes for supplying to the outer surface of the glass fiber tape wrapped in the orthogonal direction in the drawing direction, drawing while curing the glass fiber yarn and the glass fiber tape supplied into the mold in accordance with the heating of the hot plate installed in the mold It features.

Embodiments of the present invention will now be described with reference to the accompanying drawings.

1 is a manufacturing process diagram, Figure 2 is a light pole cross-sectional perspective view. The glass fiber yarn 2a installed in the rack with a predetermined number of water passes through a plurality of holes drilled in the primary guide 3a, and is supplied to the resin impregnation tank 4a to deposit the glass fiber yarn 2a in the resin. Let's do it. As the resin, a thermoplastic vinyl ester compound, a thermosetting polyester resin compound and an epoxy resin compound are used. Specifically, the composition was as follows.

100 parts of molding resin (ISO type unsaturated polyester resin)

Internal release agent (S-125) 1-3

Filler (Aluminum Hydroxide) 15-30 parts

Low shrinkage agent (vinyl acetate type) to 10 parts

Low temperature hardener (B.P.O, etc.) 0.5 to 1.5 parts

0.5 ~ 1.5 parts of high temperature hardener (FTPB)

The combination ratio of glass fiber yarn 2a and resin is 65 to 70% of glass fiber yarn, and 30 to 35% of resin.

The glass fiber yarns 2a deposited on the resin in the resin impregnation tank 4a are supplied to the mold 5 at 0 ° in the drawing direction. This glass fiber yarn 2a forms the 1st layer P1 of the lightweight pole P after shaping | molding. The mold 5 is provided with a hot plate 6 and is supplied through the secondary guide 7 provided at the inlet of the mold 5. The secondary guide 7 is provided with a perforated bushing 8 at the tip of which the glass fiber yarn 2a can be inserted, and in the middle thereof, the glass fiber tape 9 and the glass fiber yarn deposited on the resin 2b. ) Is provided with a primary guide ring 7a and a secondary guide ring 7b capable of feeding in a predetermined direction. The glass fiber yarn 2a impregnated with the resin is supplied in the drawing direction (lateral direction) to the circumferential surface of the mandrel 10 through the hole of the bushing 8. The primary guide ring 7a serves to feed the mold 5 into the mold 5 while the fiberglass tape 9 woven in a woven fabric is wrapped, and the secondary guide ring 7b is drawn out. It guides to be supplied to the mold 5 in the direction of 0 °.

The glass fiber tape 9 passing through the primary guide ring 7a is naturally rounded and wrapped so that both ends of the width direction overlap slightly (about 2 mm). The word wrapped here has the concept of being wrapped, but it is expressed as being wrapped because it is not a mere spiral winding without a force of force applied. The glass fiber tape 9 is pressed by the glass fiber yarn 2b subsequently supplied through the secondary guide ring 7b and attached to the surface of the glass fiber yarn 2a initially supplied. This glass fiber tape 9 forms a second layer P2 of the lightweight pole P after molding.

On the outer surface (circumferential surface) of the wound glass fiber tape 9, the glass fiber yarn 2b impregnated with resin is again attached at 0 ° in the drawing direction. This glass fiber yarn 2b forms the third layer P3 of the lightweight pole P after molding. The glass fiber yarn 2b installed in the rack with a predetermined number of water passes through a plurality of holes drilled in the primary guide 3b and is supplied to the resin impregnation tank 4b to deposit the glass fiber yarn 2b in the resin. Let's do it. The glass fiber yarn 2b deposited on the resin in the resin impregnation tank 4b is supplied into the mold 5 through the above-described secondary guide ring 7b. The properties of the resin and the glass fiber yarn 2b are the same as those of the glass fiber yarn 2a supplied initially and the resin deposited on the glass fiber yarn 2a.

Specifications of the glass fiber yarns 2a and 2b, the glass fiber tape 9 and the mandrel 10 are shown in Table 1 below.

Outside diameter ( ) Yarn used Seen Tape width (mm) (glass fiber tape of the second layer) Mandrel ) Primary (glass fiber yarn of the first layer) Secondary (glass fiber yarn of third layer) 7.9 ERS 2200 5 6 31 5.5 8.5 〃 6 6 33 6.0 9.5 〃 6 7 36 7.0 11.0 〃 8 10 41 8.0 12.7 〃 10 13 46 10.0

The glass fiber tape 9 was woven with a yarn of warp yarn G75½ and weft yarn K37½ at a density of warp yarn 8 and weft yarn 18, and a weight of 234 g / m 3 and a thickness of 0.3 mm was used.

The glass fiber yarns 2a and 2b and the glass fiber tape 9 which are sequentially supplied into the mold 5 are attached to the outer surface of the mandrel 10 in three layers P1, P2 and P3. Is cured by heating of the hot plate 6 installed in the mold 5. Heating temperature is 145-170 degreeC. Stabilization settings are then made at 170 ° C starting at 145 ° C. The light weight pole P hardened in the metal mold | die 5 is pulled continuously by the drawing apparatus 11 of the back, and shaping | molding is completed. Then, as a process for final product, it is cut to a predetermined length, the cut surface is assembled and assembled into joints (joints).

Table 2 below compares the conventional pole pole (Pa) and the lightweight pole (P) of the present invention. The molding temperature was 170 deg. C and the molding speed was 80 cm / min as working conditions.

division Outside diameter ( ) Internal diameter ( ) Weight (g / m) Flexural Burst Strength (kgf) Conventional Tent Pole 7.98.59.511.012.7 4.04.05.05.06.0 6882108140195 90.0110.5145.5188.5246.0 Lightweight pole of the present invention 7.98.59.511.012.7 5.56.07.08.010.0 47536083104 90.0105.5149.0190.5215.0

As a result of the comparison, the thickness of the pipe was 3.9 to 6.7 mm in the prior art within the range of no significant change in flexural rupture strength. I was able to. In addition, the weight was reduced by 21 to 91 g / m as compared to the conventional one was obtained.

3 is a graph comparing the weight between the conventional tent pole Pa and the lightweight pole P of the present invention for each standard (outer diameter). It is the conventional tent pole Pa that a high weight shows, and the hatched rod shows the lightweight pole P of this invention. It can be seen that there is a significant difference in weight. This is because the present invention places the glass fiber tape 9 as the second layer P2 between the glass fiber yarns 2a and 2b forming the first layer P1 and the third layer P3. It is possible because it was taken in the orientation of ° / 90 ° / 0 °.

According to the present invention, the orientation of the glass fiber is set to 0 ° / 90 ° / 0 ° as described above for sports and leisure, which requires light weight, large inner diameter at thin outer diameter, and high flexural strength. It will be adapted to the characteristics of the pole required by the tent. In other words, because it is light, it is easy to transport and store, and the inner diameter is large, so that the coupling (jointing) between the poles is easy, and when it is installed, it is not easily broken or bent under the influence of load or bending moment. In particular, it is possible to achieve the supply and orientation of glass fiber as above by the simple mechanism at the entrance of the mold, so the installation width of the equipment does not increase, so that many lines can be operated at the same time in a narrow place to produce a large number of poles quickly and continuously. There is. It also contributes to minimizing the consumption of difficult FRP.

Claims (2)

The first layer attached to the circumferential surface at 0 ° in the drawing direction and the glass fiber tape impregnated with the resin, and the glass fiber tape made of the woven fabric at 90 ° perpendicular to the glass fiber yarn in the first layer. The second layer wrapped and attached to the main surface, and the glass fiber yarn impregnated in the resin to form a third layer attached to the circumferential surface of the second layer at 0 ° in the drawing direction for the tent of the heat-molded structure Lightweight pole made of glass fiber reinforced plastic. The glass fiber yarn impregnated with the resin is supplied to the outer surface of the mandrel through the bushing at the tip of the mold in the drawing direction, and the primary fiber through the primary guide ring of the mold inlet is not impregnated with the glass fiber tape made of woven fabric. A glass fiber yarn impregnated in an orthogonal direction is supplied to the outer surface of the glass fiber yarn of resin impregnation, and at the same time, the glass fiber yarn impregnated in the resin is drawn to the outer surface of the glass fiber tape wrapped in the orthogonal direction through the secondary guide ring of the mold inlet. A method of manufacturing a light weight pole made of glass fiber reinforced plastic for a tent comprising a series of processes for feeding in the direction and drawing while curing the glass fiber yarn and the glass fiber tape supplied into the mold under heating of the hot plate installed in the mold.