JPS6175872A - Reticulated structure of fluorocarbon resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a network structure used when conducting heat resistance tests and chemical resistance tests of small articles, such as those used in the semiconductor industry.

Separate structures made of stainless steel have traditionally been used for this purpose, but they have problems in terms of acid resistance.

However, fluororesin is a material that has both heat resistance and chemical resistance, but since the periphery of the fluororesin mesh easily frays, it is necessary to heat-seal it with a fluororesin tape-like film made of the same material. However, under the temperature conditions at that time, the mesh tends to melt at the welded part, making the work difficult and failing to obtain sufficient strength. The purpose of the present invention is to provide a fluororesin network structure that can be used in place of the fluororesin network structure.

That is, the present invention is a separate structure of a fluororesin whose constituent element is an edged net in which a tape-shaped film of a surface-modified low-temperature adhesive tetrafluoroethylene copolymer is thermocompression bonded to the peripheral portion of a fluororesin net. .

The fluororesin constituting the network is a homopolymer resin or copolymer resin of tetrafluoroethylene, and the comonomer used is a compound represented by the following chemical formula and ethylene.

In the formula, Rf is a fluoroalkyl group having 1 to 5 carbon atoms, and
1, X2 and x3 are F or H.

Examples of such base resins include polytetrafluoroethylene resin (trade name: Teflon TFE), tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer resin (trade name: Teflon PFA), and tetrafluoroethylene-perfluoro(alkyl vinyl ether) copolymer resin (trade name: Teflon PFA). Propylene copolymer resin (trade name: Teflon FEP), tetrafluoroethylene/hexafluoropropylene 11 /<-fluoro(
Alkyl vinyl ether) copolymer resin (trade name: Teflon EPE) and ethylene/tetrafluoroethylene +
1-polymer resin (trade name: Tefzel),
Among these, tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer resin (trade name: Teflon PFA) is particularly preferred.

The opening of the mesh, the type and thickness of the thread used in the mesh, the structure of the mesh, etc. are not particularly limited, and are appropriately selected depending on the thickness, amount of hair, shape, etc. of the items to be stored in the mesh. .

That is, examples of the yarn include monofilament, strand, yarn, etc., and structural examples include woven nets such as plain weave, twill weave, and spell weave, and nets in which the intersections of yarns are welded.

The surface-modified low-temperature adhesive tetrafluoroethylene copolymer film used for edging the periphery of the net is 3
The surface of the above-mentioned tetrafluoroethylene copolymer having a melt viscosity at 70° C. in the range of 1×10 3 to 1
9-53542 and JP-A-59-86634, etc., refers to a film that has been given adhesive properties by subjecting it to electrical discharge treatment, such as Teflon PFA "C" film (trade name) and FEP. ″Cn
There is a film (product name).

The network structure of the present invention is made by thermo-compression bonding the tape-shaped film described above to the peripheral portion of a fluororesin net at a temperature at which the film does not substantially melt, that is, at a temperature in the range from 150°C to around the melting point of the film resin. It has a mesh net as a component, and by adopting this temperature condition, it is possible to create a border without fusing the mesh or reducing its strength.

The effects of this edging include preventing the mesh from fraying, stabilizing its dimensions, and making it possible to melt adhesive and sew the edging, making it possible to manufacture bag-like or box-like articles as shown in FIGS. 2 and 4. The advantages include that it becomes easier to

Among the network structures, first, the basic structure of a fluororesin network structure constructed in a sheet shape will be explained with reference to the attached FIG. 1. This figure is a partial plan view showing the upper left part of the sheet.
A tape-like film 3 of surface-modified low-temperature adhesive tetrafluoroethylene copolymer is bonded by thermocompression to the left side and upper side of a net 2 made of monofilament 1 of fluororesin. This figure shows the state where the left side and top side are bordered, but even if you border the periphery of the net, it will still be -
You may add borders only to the edges.

What is shown in FIG. 2 is an example of a bag-shaped fluororesin network structure, in which the sheet-like edged net 2 shown in FIG. 1 is folded in half, and the left side 3a and right side 3b are overlapped. Tape-like films of the surface-modified low-temperature adhesive tetrafluoroethylene copolymer are heat-compressed or heat-sealed to form a bag with an open top. In this case, the left and right sides are made by first overlapping the material nets, then sandwiching a tape-like film of surface-modified low-temperature adhesive tetrafluoroethylene copolymer, or wrapping them with the tape-like film and bonding them by thermocompression or heat bonding. It may be fused, but it is convenient to open and close if you pass a string 4 made of resin as shown in the figure near the top of this bag, or heat-seal a seal chuck made of fluororesin. It is.

Fig. 4 is a partial perspective view of an example of a box-shaped resin network structure, and Fig. 3 is a perspective view of the entire structure, showing a smaller version of the resin box-shaped frame. On the bottom and sides of 5,
The sheet-like network structure shown in FIG. 1 is fused.

This fusion can be carried out by applying a tape-like film of a surface-modified low-temperature adhesive tetrafluoroethylene copolymer, which is thermocompression-bonded to the edge of the sheet-like network structure, to a frame.

A similarly configured lid may be attached to this box-shaped fluororesin network structure so as to be openable and closable, if necessary.

1. The fluororesin network structure of the present invention has good adhesive strength between the peripheral part of the network and the edging tape.

There is no fusing of the fluororesin filaments that make up the network, and no fraying occurs.

The fluororesin network structure of the present invention can be bonded by thermocompression bonding or heat fusion at a temperature below the melting point, or by sewing or other means of joining the edging film parts together or the edging film part and another article, thereby increasing the strength. It is possible to easily make cylindrical bag-like and box-like articles with high workability.

Furthermore, the network structure of the present invention has the characteristics of fluororesin, such as heat resistance, chemical resistance, and weather resistance.
In addition to being able to maintain its properties under most environments, Fu7 resin itself has extremely high purity in terms of wood quality, and is an anti-oxidant, UV inhibitor, and plasticizer that are often used in other general-purpose resins. Since it does not contain any metal ions, etc., it can be used as a test container for semiconductors, or for other purposes! ? Useful as containers used in harsh environments.

Furthermore, due to the non-adhesive properties of fluororesin, there is less foreign matter adhesion during use, and it is lighter and easier to handle than conventional stainless steel products.

[Brief explanation of drawings]

FIG. 1 is a partial plan view of a sheet-like fluororesin network structure, FIG. 2 is a perspective view of a bag-like fluororesin network structure,
Figure 3 is a perspective view of a box-shaped frame made of fluororesin used to construct the box-shaped fluorine MA resin network structure shown in Figure 4; FIG. 2 is a partial perspective view of a network structure of FIG.

Claims (1)

[Scope of Claims] 1. A fluororesin network structure comprising a rimmed network in which a tape-shaped film of a surface-modified low-temperature adhesive tetrafluoroethylene copolymer is thermocompression bonded to the peripheral portion of the fluororesin network. 2. The fluororesin network structure according to claim 1, which has a sheet-like shape. 3. The fluororesin network structure according to claim 1, which has a bag-like shape. 4. The fluororesin network structure according to claim 1, which has a box-like shape.