JPH06505285A - Method and apparatus for forming load-bearing joints with compressed cellular plastic materials made to expand upon heating - 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] High strength due to compressed cellular plastic material made to expand when heated Method and apparatus for forming a bond The present invention has a form that is stable at room temperature and expands upon heating after insertion into the joint area. compressed cellular which fills the entire joint area. Forming load-bearing joints by using plastic materials Concerning how to accomplish this. Alternatively, the bonding is carried out during the expansion phase of the plastic filler material. A phosphor that melts at high temperatures, thereby forming a bond between the filler material and the substrate material. This can be ensured by hot melt adhesives or hot melt adhesives with hardeners. I can do that.

With this method, when the filler material is heated, the joint area is filled and the pressure is applied to the bond. act on the agent and ensure bonding to the substrate material once and simultaneously. Furthermore, the present invention According to the method, the ingredients for making the bond are dry when handled.

This method can be applied to load-bearing joints of core materials in sandwich structures, but This is used for concrete panels, wall panels, window panels, etc. in building structures. It can also be applied to bonding.

Current state of technology There are many ways to fill the joint area. Examples of methods that have already been patented include: There are: US3806566: US4898630, US46477 16, DE-A1963267 and DE-A1784467゜However, the above Common to most of the notation methods is that they primarily fill or seal holes, gaps or closed spaces. In particular, most methods are not chemical, The method of the present invention, which is based on e.g. foaming or vulcanization, can instead be compressed at room temperature. It is based on strong energy in the form of a heated gas, and then the energy is (heat deflection temperature of plastic filler material).

In DE-A 1784467 a non-chemical Murakami method is described. child The method is based on the compression of elastic plastic materials with open cells. This person This method cannot be applied to form rigid, load-bearing joints; The plastic material has no dimensional stability at room temperature when compressed, tJs4 No. 647,716 describes a method similar to the method of the present invention. However, this Even in these cases the purpose is to seal.

To obtain a sealed electrical connection, compressed cellular plastic material is used to connect is placed between the shrink tube and the wire to completely encapsulate it. Then connect the connector normally Heat it using the following method. It is considered appropriate to heat using a hot air gun. According to this, the tube contracts and the piece of cellular plastic material expands, thus This patent describes a cellular plastic material (in this patent A hot melt adhesive is applied to the It also mentions the possibility of ensuring that a ban is obtained. Therefore, the said patent applies to electrical connectors. It describes a method for sealing a bond, not a method for forming a load-bearing joint.

Application example Thursday m5! 0 examples of using cellular plastic materials as core materials in sandwich structures Boats and boats, for example, are often constructed according to this principle. The core material of the boat The core material is a fiber-reinforced plastic that is fixed to a wooden structure formed in the shape Applicable both inside and outside. The components used for this kind of sandwich structure The a material is in the form of boards of various sizes. When the boards are attached together, A gap remains between them. To obtain continuous interaction of mosquitoes in sandwich structures, These gaps are filled with material that joins the edges of the boards together. Until now, this This is done using a putty formulation having a density of approximately 0.6-1.5 Kg/dm''. There is. Cellular plastic materials usually have a density of 0.045-0.25 Kg/dm” have Using putty formulations increases the weight of the structure, which is undesirable and creating discontinuities in the core material, which can occur, for example, when subjected to impact or when the structure is When noise is generated, it can have a negative impact on the strength of sand inch structures. other Negative effects include the generation of acoustic and heat transfer.

Joints typically shaped as shown in Figure 1 are filled by injecting a putty compound. . This method results in incomplete fill joints and weakens the sandwich structure. It shows.

Depends on the day The filler material is pressed together with a strip of cellular plastic material (2) under high temperature. (see Figure 2), thus reducing their thickness to that required by the method. , for example to 30% of the original thickness (see Figure 3). The compressed strip is , by allowing the strip to cool before removing the pressure, the strip will cool after the pressure is removed. even maintain its reduced thickness. Moisture curing hot melt adhesive film ( 4) is applied to the filler material during or after compaction. Filler with adhesive coating Insert the material into the joint area (1) (see Figure 4). strips of filler material By heating to approximately 70°C, the filler material softens until the joint area is filled. expands due to internal overpressure. When the filler material and adhesive are heated, the adhesive melts. As the filler material melts and expands, it presses the adhesive against the base material and A bond is then formed between the filler material and the substrate material (5) (see FIG. 5). cooling Afterwards, the filler material hardens and regains its original properties. With the curing of the filler material, it This prevents further expansion and ensures that the bond remains stable. glue hardens due to moisture in the air.

Obtaining joints with load-bearing properties such as good tensile and compressive strength as well as shear strength Therefore, this method must meet the following requirements: 1. The filler material must pass the set strength requirements. 2. The adhesive must pass the set strength requirements. Must pass the test.

3. The bond between the filler material and the substrate material is formed by the components that make the bond, i.e. the filler material, the Must pass the same requirements set for hot melt adhesives and substrate materials. No.

To pass the last requirement, the filler material must completely fill the joint area. i.e. the filler material must expand uniformly and completely along the entire joint. No.

Also, hot melt adhesives are Must be completely melted. This is suitable so that the heat meets the above requirements. means that it must be used. The present invention can be used, for example, in sandwich structures. Provides a solution to the problem of forming an inherently durable bond.

The present invention can be bonded at relatively low temperatures, e.g. 60°C, and when the filler material expands. To provide a method for reproducing the original shape of the tree. Therefore, the size of the filler strip should be - Expansion due to force ratio foaming is always uncontrollable.

In the present invention, a rigid cellular plastic material with closed cells is used. child This is done not only to ensure sufficient strength and stiffness of the finished joint, but also to prevent expansion. It is an essential requirement that gives rise to

Example of method ・Notice of Saw a strip of filler material at the desired dimensions from a substrate material, e.g. PVC foam material. or by other means. Apply pressure to achieve sufficient pressure on the adhesive. Strips of pre-compact filler material are placed in the joint area where they are to be inserted prior to compaction. It should be a little thicker. The thicker the strip of filler material (the more heated The pressure on the adhesive increases as the filler material expands during the step. But filler material The filler material must expand as fully as possible when it reproduces its maximum strength. Therefore, the air bubbles in the material must have a maximum spherical acid (to achieve the desired strength) Try to give.

The filler material is then placed in a heating device heated to approximately 80°C. After heating, then filling Place the agent material in a press and compress it to about 20-50% of its original thickness. This operation During production, the filler material can be covered with a film of hot melt adhesive, which is the filler material Because of the pressure and heat from the material, it adheres to the filler material in a planned manner. Moshiho A film of hot melt adhesive is prepared a few minutes before it is applied (just before the pressing stage). If so, hot melt adhesives do not become filler materials even after they stiffen. It will be glued.

Hot melt adhesives can also be applied to the filler material at a later stage. the easiest A method is to apply the adhesive film to the filler material before inserting the filler material into the joint area. It is attached by folding it around the strip. Adhesive film is filler material It can even consist of two separate layers, one applied to each side of the material.

Charm by micro A compressed strip of filler material is inserted into the joint area and exposed to electromagnetic radiation, e.g. Heating with black waves. For example, hot melt adhesives made of polyurethane It is influenced by the electromagnetic field and thus becomes heated. The filler material When the adhesive is heated, it is heated indirectly. The electromagnetic field is homogeneous in the junction area. Because it is formed in such a way that the hot melt adhesive is heated immediately and evenly. do. This also ensures uniform indirect heating of the filler material. Uniform expansion, adhesive A uniformly distributed pressure is obtained on the top.

In most cases of sandwich construction in boats and boats, the core material is PVC is used. PvC is almost completely unaffected by electromagnetic fields, so It will not heat up. The same advantageously made from the same material as the core material Can be applied to filler materials. The heating that occurs is very small for the entire assembly. It only comes from hot melt adhesives with high capacity. However, this heat Sufficient to expand the filler material to the desired degree. Charging in compressed state The filler material is very thin and contains very little mass relative to the width of the joint area, which It will heat up without any difficulty.

The finishing stage of this method involves removing the excess hot melt adhesive extruded during the inflating stage. The goal is to eliminate the After the hardening process is completed, the crosspieces are well-filled load-bearing joints. It is. Use foam plastics other than PvC, such as PUR, PS, etc. Tick can be used as a filler material or as a core material. Most bubble plastic The stick is hardly affected by electromagnetic radiation, so the advantages of the heating means are maintained. held. Unnecessary heating of the base material is thus avoided. hot melt adhesive shapes Polyurethane heats up very quickly, but foam plastic of the same material It should be noted that the stick is heated almost completely (not heated) by electromagnetic radiation in the same amount of time. It is possible. However, after a sufficiently long time, e.g. This will result in even heating of most cellular plastic materials. but However, for example for PvC, this occurs in an unstable manner and locally in the material. causing an uncontrollable temperature rise. This is undesirable, so indirect heating It is even more advantageous.

During the chemical processing used in the production of cellular plastic materials, electromagnetic radiation It is also possible to use additives which are influenced by Examples of such additives include powders. There are powdered coal and powdered steel. However, this makes the material more expensive and causes problems during foaming. It also gives rise to problems. Thus obtaining a cellular plastic material with sufficiently good properties It is difficult to do so.

11 kodan kōken When building a boat or boat with a sandwich structure, the heat is supplied by hot air equipment, electric swings, etc. It can be applied by using ket etc. When heated with hot air, the material containing the structure Care must be taken to regulate the temperature to avoid damage. this is , especially in large structures where heat is applied for relatively long periods of time, e.g. several hours at a time. is important.

international search report l11-1111艷1^-mlejllaa Tla ρCT/SE 9210 0076 international search report ;=Nii:　==;=3;;=-1"-11 Kago calendar"-゛--themmhP s-011icaIIIsMwwmm-mman-mockingkhwe---1 groanvdw amkw--Chic--1emla1w+m1quest|Sue・ Continuation of front page (51) Int, C1, S Identification symbol Internal reference number E 04 B 1/6 84 // B 29 K 105:04 B29L 31:10 4F (81) Designated countries EP (AT, BE, CH, DE.

DK, ES, FR, GB, GR, IT, LU, MC, NL, SE), AT, AU , BB, BG, BR, CA, CH, C3, DE, DK, ES, FI, G B, HU, JP, KP, KR, LK, LU, MG, MN, MW, NL.

No, PL, RO, RU, SD, SE, USI (72) Inventor: Lyogno, Anders Sweden, 171 40 Solna, Villebergsvegen 9 (72) Inventor Grip, Sven Sweden, 184 32 Oke Rusberga, Offsenstinirnas Vueg (72) Inventor Torque, O -ke Sweden, 142 43) - Longsund, Revivegen 24

Claims (1)

[Claims] 1. Using cellular plastic material as filler material (2); cellular plastic (3) into a form that is stable at room temperature; (4) (Figure 4); insert the filler materials (3) and (4) into the joint surface (1). (Figure 4); and heating causes the filler material to expand, thus filling. The molten side of the filler material is pressed against the defined surface of the joint area (Figure 5), and then the filler material A method of forming a load-bearing joint comprising cooling the material. 2. Adhesives that are hot melt adhesives or hot melt adhesives with a curing agent ( 4) in which the adhesive is melted during the heating phase of the filler material. The method described in section. 3. Claim 1 using a one-component or two-component adhesive (4) in liquid form How to put it on. 4. Use of one-component or two-component adhesives (4) in liquid form or hot melt adhesives The use of hot-melt adhesives with adhesives or hardeners and exposing said adhesives to electromagnetic radiation 2. The method according to claim 1, wherein the method is heated by: 5. It expanded under heating and was compressed by covering both sides with a connecting agent film (4) (Fig. 4). form a load-bearing joint characterized by being a strip of cellular plastic (3) filler material used to form