JPH0262210A - Manufacture of shock absorbing sheet - Google Patents

Abstract

PURPOSE:To continuously produce sheet-like material, which has projecting and recessed forms and is excellent in shock-absorbing action, by a method wherein liquid-like material, which forms crosslinked viscoelastic body at 5 - 80 deg.C, is applied onto matrix, which is embossed in projecting forms or recessed forms and arranged on a conveyer belt, and, after that, crosslinked and finally released from the matrix. CONSTITUTION:Matrix 2, which is embossed in projecting forms or recessed forms, is arranged on a conveyer belt 1. Or a conveyer line consisting of continuous metallic or plastic matrix is used. The favorable ratio of the embossed area in projecting or recessed forms to the non-embossed area is 1:9 - 9:1. The favorable depth of the recessed form or height of the projecting form is 10mm or less. The crosslinked viscoelastic body is liquid at normal temperature and crosslinks at 5 - 80 deg.C and keeps its shape at 80 deg. and has a hardness of 50 or less at 20 deg.C measured with the C-type hardness gauge on Standard of Society of Rubber Industry, Japan. As the reactive substance, which satisfies the above-mentioned conditions, telechelic polymer having hydroxyl group at its terminal is the most suitable one. As crosslinker, isocyanate-based polymer is favorable. Further, when necessary, the sheet concerned can be laminated to various sheet-like materials so as to be made into an integral body.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing an impact cushioning sheet. The present invention relates to a method for continuously producing a receipt sheet having an uneven cross-sectional shape.

(Conventional technology) In recent years, with the advancement of science and technology and changes and improvements in the human living environment, not only precision machines and computers, but also
Humans have also become extremely sensitive to surrounding sounds and vibrations, and their tendency to exclude and aggravate vibrational impact sounds such as mechanical vibrations, noise, and solid-borne sound has become particularly strong.

(Problem to be solved by the invention) As an example, as a result of a questionnaire survey of complaints regarding human living spaces, noise from the upper floors of high-rise buildings such as condominiums and apartment complexes was the most cited as a major problem. In particular, the sounds of daily life such as the footsteps of people walking on the upper floors and the sounds of children running around are transmitted to the people living on the lower floors as noise. It has been found that these areas are breeding grounds for mold and dust mites, and are a source of diseases such as Kawasaki disease, asthma, and eczema. Therefore, a review of wooden floors as a clean floor began, and in recent years, the demand for wooden floors has increased rapidly due to people's preference for natural and authentic living spaces. This means that even under normal living conditions, the noise from people walking on floors and other living things can be unbearable to the people living downstairs. It was a flooring material that could not be used in a house even if we wanted to.

(Problem to be solved by the invention) In recent years, wooden floors with various shock-absorbing functions have been commercially available to compensate for these drawbacks of wooden materials, but they have complicated multilayer structures and are expensive. However, the shock-absorbing effect was not yet sufficient.

In addition, placing too much emphasis on lightweight impact noise can significantly impair the properties of the floor slab against heavy impact noise, causing the sound of children running and jumping to be more audible to people downstairs. On the other hand, placing too much emphasis on sound countermeasures has resulted in some products having defects in their functionality as flooring materials.

Generally known methods for absorbing shock include laminating a highly rigid material and a soft material, and a so-called sandwich damping material in which a soft material is sandwiched between highly rigid materials. These absorb vibrations caused by impact by changing the vibration energy into thermal energy through shear deformation due to displacement internally or at the laminated interface. In other words, when shock absorbers receive impact, they lose their intended function. There is a demand for something that can be largely displaced within a range that does not occur, and that has high restorability. Here, vulcanized rubber is suitable as a material that can undergo a larger displacement without impairing the intended function and has high resilience, but the vulcanized rubber that has been commonly used in the past has mainly been molded by press molding or injection molding. , this requires a long processing time per unit area, and it is difficult to obtain a complicated shape, leading to high costs. In addition, it has a low hardness (SRIS-01) that can fully demonstrate the impact buffering effect.
It is very difficult to obtain a vulcanized rubber with a vulcanized rubber of 01 (50 or less), and there are problems in dimensional stability and durability.

On the other hand, by complicating the cross-sectional shape of the shock absorbing material in order to increase the shock absorbing effect, it is possible to achieve a certain amount of displacement with a relatively small stress, but in order to increase the amount of displacement beyond that, a very large stress is required. Although it would be desirable to have such a shock absorbing material, it has not been possible to obtain such a shock absorbing material in the past.

(Means for Solving the Problems) The purpose of the present invention is to provide a shock-absorbing sheet with high vibration damping and shock-absorbing effects at a low cost. This invention has been achieved.

In the present invention, a mother die embossed in a convex or concave shape is placed on a conveyor belt, and the surface of the mother die is heated at 5°C to 80°C.
By applying a liquid material that forms a crosslinked viscoelastic material in a temperature range of There is a method for manufacturing an impact cushioning sheet, characterized in that the material can be obtained continuously.

In the manufacturing method of the present invention, the mother mold embossed in a convex or concave shape is in the form of a sheet made of polyethylene, polypropylene, vulcanized rubber, etc., and is affixed to a conveyor belt. do.

In the manufacturing method of the present invention, the convex or concave embossed matrix forms the conveyor belt itself made of polyethylene, polypropylene, vulcanized rubber, etc.
The conveyor belt itself is characterized by being embossed in a convex or concave shape.

In the manufacturing method of the present invention, convex or concave embossed mother molds are connected in a caterpillar shape, and the caterpillars are made of metal such as aluminum, iron, stainless steel, polyethylene, polypropylene, vulcanized rubber, etc. It is characterized by being a polymer or a composite material of metal and polymer.

In the manufacturing method of the present invention, the convex height or concave depth of the mother mold embossed in a convex or concave shape is 10 mm or less, and the crosslinked viscoelastic body and the space formed in the concave or convex shape are It is characterized by having an area ratio of 1:9 to 9:1, and a volume of one concave or convex shape being 0.05 cc to 20 cc.

In the manufacturing method of the present invention, a mother mold embossed in a convex or concave shape is placed on a conveyor belt, and a liquid is applied to the surface of the mother mold to form a crosslinked viscoelastic body in a temperature range of 5°C to 80°C. When applying materials to cause a crosslinking reaction, non-woven fabrics, split cloth, glass cloth, cheesecloth, paper, vinyl chloride, polyethylene,
EVA,,CR.

Sheet-like materials such as EPT or foamed sheet-like materials are laminated, and after a crosslinking reaction, the mold is released from the matrix surface to form a body,
It is characterized in that a concave or convex impact cushioning sheet is obtained continuously.

In the manufacturing method of the present invention, a liquid material that becomes a crosslinked viscoelastic body in a temperature range of 0 to 80°C has hydroxyl groups at both ends of the molecule. The main polymer components are a main component mainly consisting of telekirik polymer and a crosslinking agent having two or more isocyanate groups per molecule as reactive groups that react with hydroxyl groups, and
A crosslinked viscoelastic material crosslinked in a temperature range of 0°C maintains its shape even when heated to 80°C, and its hardness at 20°C is 50 on the C-type hardness tester specified in Japan Rubber Association Standard 5RIS-0101.
It is characterized by satisfying the following conditions.

(Example) Next, an embodiment of the present invention will be described.

The embodiment of the present invention includes a conveyor line 1 in which an embossed matrix 2 is disposed on a conveyor belt 1, a mixing agitator 3, a coating machine 4, a heating chamber 5, a sheet stacking device 6,
A winder 10 is connected to the winder 10 via guide rolls 11A, 11B, and a pressure roll 12, and the temperature is set at 5°C in the mixer agitator 3.
Liquid material 3A that forms a crosslinked viscoelastic material in the temperature range of ~80°C
are mixed, coated with a coating machine 4, heated in the next heating chamber 5,
A crosslinked viscoelastic body 8 is made, a sheet-like material 9 is sent out from a sheet laminating machine 6, the sheets are laminated via guide rollers 11A, IIB, and a pressure roll 12, and the anti-stick sheet 7 is wound from an anti-stick sheet reel 7A. Then, the crosslinked viscoelastic body 8 is lined with the sheet-like material 9 and anti-adhesive sheet 7, and then wound up on a winding machine 10.

Next, each configuration will be described in detail.

The matrix 2 embossed in a convex or concave shape is disposed on the conveyor belt 1, or is a conveyor line in which metal or plastic matrices are continuous, and the surface shape is convex or concave. A convex or concave shape may be a cylinder, a cone, a hemisphere, etc., and the shape is not limited. Also, the area that is processed into a convex or concave shape and the area that is not processed are 1
:9 to 9:1, and it is desirable that the depth of the concave mold or the height of the convex mold be 10 mm or less. In other words, if the embossed area is less than 10% of the total area of the mother mold surface, and the emboss shape is convex, the sheet released from the mother mold on the conveyor belt will have 10% of the sheet area. % or less, and this ratio of recesses is not appropriate because when an impact force is applied, the impact buffering effect due to the deformation effect obtained by embossing is not sufficiently exhibited. In addition, if the embossed area is 10% or less of the total area of the matrix surface and the surface shape is concave, the sheet released from the matrix on the conveyor belt will have a surface area of 10% or less of the sheet area. It will have a convex part, but with this proportion of convex parts, when an impact is applied, it deforms with a relatively small initial stress, but it has poor restoring force, so it cannot have a practical impact buffering effect. I can't.

Furthermore, if the depth of the concave portion or the height of the convex portion of the matrix 2 disposed on the conveyor belt 1 is 10 mm or more, the impact buffering effect will be lower than the case where the raw material cost is higher than if the depth is 10 mm or less. , the impact buffering effect hardly changes, so it does not meet the purpose of the present application.

Next, the mixer 3 used in the present invention is a mixer that mixes, stirs, and discharges a main component and a crosslinking agent that can undergo a crosslinking reaction at room temperature or a temperature range above room temperature, and is a mixer that can mix and stir two or more liquid components. That's fine.

Next, the coating machine 4 used in the present invention may be one that can obtain a uniform coating thickness using a doctor knife or the like.

Next, in the heating chamber 5 used in the present invention, a main component and a crosslinking agent that can undergo a crosslinking reaction at room temperature or a temperature range above room temperature are mixed and stirred by a mixer 3, and then discharged, and coated into a uniform thickness by a coating device 4. Any material may be used as long as it is installed at a position after application and can be set and maintained at a temperature that can promote or excite the crosslinking reaction.

In addition, the sheet laminating machine 6 used in the present invention promotes or excites the crosslinking reaction between the base material and the crosslinking agent, which can undergo a crosslinking reaction in a temperature range of 5°C to 80°C, by passing through the heating chamber 5. It is installed after the heating chamber 5 in order to stack arbitrary sheet-like materials 9. Further, the optional sheet material 9 may be a sheet material such as non-woven fabric, split cloth, glass cloth, cheesecloth, paper, vinyl chloride, polyethylene, polypropylene, EVA, CR, EPT, or vinyl chloride foam, polyethylene. It refers to foamed sheet materials such as foam, polystyrene foam, polypropylene foam, polyurethane foam, etc., and any device may be used as long as it has feed rolls IIA, IIB, and pressure rolls 12 for laminating these sheet materials.

Further, the winding device IO used in the present invention is installed at the end point of the conveyor line, and the liquid material applied on the mother mold surface 2 processed into a convex or concave shape is heated as a crosslinked viscoelastic material 8 at room temperature. After the crosslinking progresses to such a degree that the shape can be maintained within a certain range, the crosslinked viscoelastic body 8 must have enough tension to be released from the surface of the embossed matrix 2 placed on the conveyor belt 1, and this winding It is desirable to have a device that can adjust the winding tension, and also a device that can select an arbitrary winding length. In addition, in some cases, it is desirable that a device for winding up an anti-stick film to prevent blocking between the wound shock-absorbing sheets during winding is also provided.

Next, the crosslinked viscoelastic body 8 used in the present invention will be explained.

The crosslinked viscoelastic body referred to in the present invention is a crosslinked viscoelastic body that is liquid at room temperature and crosslinked in the temperature range of 5°C to 80°C.
It maintains its shape even when heated to 0°C, and satisfies the condition that the hardness at 20°C is 50 or less on a C-type hardness tester specified in Japan Rubber Association Standard 5RIS-0101. Considering reaction rate control, cost, and availability, the most suitable reactive substance that can satisfy the above conditions is a telechelic polymer with a hydroxyl group at the end, such as main chain polybutadiene, hydrogen Added polybutadiene, polybutadiene-nitrile, polybutadiene-
Styrene, isoprene, etc., polyether polyol,
It is desirable to use polyester polyols, urethane acrylic polyols, aniline-derived polyols, etc. alone or in combination. Further, as the crosslinking agent for the reactive substance, an isocyanate-based crosslinking agent is suitable, and it is necessary that each molecule has two or more isocyanate groups.

Specific examples include toluylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and prepolymers containing terminal isocyanate groups.
They can be used alone or in combination. Also, isocyanate-based crosslinking agents can be used in combination with plasticizers due to problems such as blending ratio and/or viscosity, but the plasticizer must be dehydrated and must not react with the isocyanate compound. It is.

Although it is possible to obtain a crosslinked viscoelastic body that satisfies the present invention by combining only the essential components that undergo a crosslinking reaction in the above temperature range of 5°C to 80°C, it is possible to obtain a crosslinked viscoelastic body that satisfies the present invention. By further adding various additives, a wide variety of stable crosslinked viscoelastic materials can be obtained.

Additives include plasticizers, fillers, bituminous substances, tackifying resins, anti-aging agents, anti-mold agents, flame retardants, catalysts, surfactants,
Coupling agents, foaming agents, etc. may be mentioned.

The plasticizer is blended for the purpose of adjusting viscosity, improving workability, adjusting the physical properties of the crosslinked viscoelastic body, imparting flame retardance, and the like.

Specific examples of plasticizers include naphthenic oil, paraffinic oil, aromatic ink oil, castor oil, cottonseed oil, pine oil, tall oil, phthalic acid derivatives, isophthalic acid derivatives, adipic acid derivatives, maleic acid derivatives, and liquid rubber. There are some that do not contain functional groups, and they can be used alone or in combination. If flame retardancy is required,
Halogen compound-based and phosphorus compound-based plasticizers can be used alone or in combination. Examples of bituminous materials include straight asphalt, blown asphalt, and tar, which may be modified in advance with a tackifying resin, plasticizer, etc. in order to obtain a desired crosslinked viscoelastic material.

Tackifying resins include natural resins, rosins, modified rosins, derivatives of rosins and modified rosins, polyterpene resins, modified terpenes, aliphatic hydrocarbon resins, cyclopentadiene resins, aromatic petroleum resins, and phenolic resins. ,
Alkylphenol acetylene resin, vinyltoluene
α-methylstyrene copolymer and the like can be used alone or in combination.

Fillers are effective in improving vibration damping properties, sound insulation properties, and flame retardancy, and are used to adjust the blending ratio of the main ingredient/crosslinking agent, adjust viscosity, and reduce compounding costs. Anything commonly used in paints can be used.

Specific examples include mica, graphite, vermiculite,
Scale-like inorganic powders such as talc and clay, ferrite, metal powders, barium sulfate, high specific gravity fillers such as lithopone, calcium carbonate, finely divided silica, carbon, magnesium carbonate,
General-purpose fillers such as aluminum hydroxide and asbestos can be used alone or in combination. Moreover, antimony dioxide, borax, etc. can be used for the purpose of flame retardation.

Other additives include anti-aging agents, catalysts, pigments, surfactants, coupling agents, antifungal agents, foaming agents, etc., and these can be added as necessary.

EXAMPLES Next, the present invention will be explained with reference to examples, and a comparative example will be shown regarding the impact cushioning sheet manufactured according to the examples, and the present invention will be explained in detail.

FIG. 1 schematically shows the method for manufacturing an impact cushioning sheet of the present invention, in which an embossed matrix surface 2 is placed on a conveyor belt 1, and on this matrix surface 2, 5
The main ingredient and the crosslinking agent, which can undergo a crosslinking reaction in the temperature range from ℃ to 80℃, are mixed, stirred, and discharged from the mixing a3, and the mixture is coated with a uniform thickness using a coating machine 4 such as a doctor knife, and then placed on a conveyor belt. After that, a heating chamber 5 is arranged to promote or excite the crosslinking reaction to advance the crosslinking reaction, and if necessary, a sheet-like material or a foamed sheet-like material is laminated. At the end of the conveyor line, the cross-linked viscoelastic body is progressed to a degree of cross-linking that can maintain its shape at room temperature, and then the winding device 6 is provided with a layering device 6 for laminating the cross-linked viscoelastic material from the embossed matrix surface 2 placed on the line conveyor. By peeling it off and winding it up, it is possible to continuously produce a shock-absorbing sheet with excellent shock-absorbing properties.

FIG. 2 shows a concavely embossed master mold surface 2 placed on a conveyor belt, and FIG.
FIG. 2 is a perspective view of a shock-absorbing sheet produced according to the embodiment shown in FIG. 1 using a conveyor belt 1 with a matrix surface 2 embossed in the concave shape shown in the figure. FIG. 4 shows a convexly embossed mother mold surface 2 placed on a conveyor belt, and FIG. 5 shows a convexly embossed mother mold surface 2 shown in FIG. FIG. 2 is a perspective view of an impact cushioning sheet manufactured according to the embodiment shown in FIG. 1 using a conveyor belt.

As mentioned above, a liquid material that becomes a crosslinked viscoelastic substance is applied at a temperature range of 5°C to 80°C onto an embossed matrix placed on a conveyor line, and after a crosslinking reaction is caused, the mold is released. A cross-sectional shape having a concave or convex cross-section
Excellent sheet materials for 1llll use can be obtained continuously, and if necessary, non-woven fabrics, split cloth, glass cloth, cheesecloth, paper, vinyl chloride, polyethylene, EVA, CR, E
Can be laminated with sheet materials such as PT or foam sheet materials,
By making it an integrated system, the impact buffering effect and reinforcing effect can be further improved. Further, by simply changing the shape of the embossed matrix placed on the conhair heald of the present invention, it is possible to produce a sheet with a more complex shape, and it is expected that the shock-absorbing effect due to the above-mentioned deformation will be increased.
This has the effect that the shape of the impact cushioning sheet can be easily changed. Further, the production cost associated with continuous production can be reduced, and the crosslinking rate can be easily adjusted by providing a heating chamber, which is useful for cost reduction.

Next, “J” manufactured by the embodiment of the present invention shown in FIG.
The present invention will be explained by illustrating a comparative example regarding llllt.

Table 1 shows Examples 1 to 3 of the impact cushioning sheet shown in FIG. 3 manufactured according to the embodiment of the present invention shown in FIG. 1, and Comparative Examples 1 to 3.
is shown in Figure 8.

Samples used in Examples and Comparative Examples were prepared by the following method.

Examples 1 to 3 are impact cushioning sheets manufactured according to the embodiment shown in FIG. 1 of the present invention. In other words, a liquid material adjusted so that the hardness after crosslinking is 50 or less on a 5RIS-0101C type hardness tester is applied onto the convexly embossed mother mold surface on a conveyor belt, and after a crosslinking reaction is performed. Example 1 is a shock-absorbing sheet that is released from a concavely embossed matrix surface by a winding device and wound up.
Same (Example 2 is a case in which non-woven fabrics are laminated using the laminating apparatus shown in FIG.
It is released from the mold surface which has been embossed into a concave shape and then wound up. Further, the concave emboss shape on the conveyor heald used in Examples 1 to 3 had a height of 4 mm and a concave volume of 1 cc. Comparative Example 1 is a vulcanized rubber whose hardness is adjusted to 80 on a 5RIS-0101C hardness tester by press molding using a mold with an emboss shape similar to that used in Examples 1 to 3. It is a board,
Comparative Example 2 is a commercially available foamed polyethylene sheet, and Comparative Example 3 is one in which the vulcanized rubber used in Comparative Example 2 is press-molded into a flat plate shape.

Next, the test method will be described.

], Hardness 2 Hardness was measured using a C-type hardness meter specified in Japan Rubber Association Standard 5RIS-0101. In addition, when measuring the hardness of the crosslinked viscoelastic materials used in Examples 1 and 2 and Comparative Example 1, the specimens were cured at room temperature for 7 days and left standing in a 50°C atmosphere for 7 days. .

2. Light floor impact sound: 9. The sample pasted on the OL composite flooring was pasted on the entire surface of the RC 150mm thick slab using double-sided tape as shown in Figure 7 using the method shown in Figure 6. Vibration was performed at the three points shown using a tapping machine, and measurements were taken at five points in the sound receiving room to meet JIS-A-1.
The sound insulation grade was determined by the method shown in 419.

3. Restorability: The samples used in Examples 1 to 3 and Comparative Examples 1 to 2 were cut into 50 mm x 50 mm, and each
．． Laminated on 5t plywood, compression speed 2 using compression tester
It was compressed by 50% at mIn/min, held for 30 minutes, unloaded, and restorability was checked after 10 minutes. Those that showed a restorability of 95% or more were rated as 0.5 and those that were 95% or less were rated as ×.

4. Compression characteristics: Chart obtained by compressing the relationship between compressive stress and displacement amount of the samples shown in Examples 1 to 3 and Comparative Examples 1 to 2 using a compression tester at a compression speed of 2 mmZ. The amount of displacement and compressive stress were read and graphed.

Next, Examples and Comparative Examples will be described based on test results.

Examples 1 to 3 are impact buffer sheets manufactured according to the example shown in FIG. 1 of the present invention, and Example 1 is a crosslinked viscoelastic body that meets the scope of the claims of the present invention. Example 2
In Example 3, a nonwoven fabric is laminated on a crosslinked viscoelastic body that also meets the claims of the present invention using the sheet lamination apparatus shown in the first embodiment, and in Example 3, a nonwoven fabric is laminated in the same way. A polyethylene foam is laminated onto a crosslinked viscoelastic body that meets the claims of the present invention using the sheet lamination apparatus shown in the first embodiment. Examples 1 to 3 are examples of the use of the impact cushioning sheet manufactured according to the present invention.It was found that the sheet had an excellent impact cushioning effect in floor impact sound measurements, and also had good restorability. I know that there is.

Furthermore, from the compression characteristics diagram shown in Table 2, it can be seen that even a small amount of compressive stress causes a large displacement, and when the amount of displacement exceeds a certain level, a large compressive stress is required. It can be seen that it is practical. Comparative Example 1 is a vulcanized rubber having the same cross-sectional shape as Example 1, but
When compared with Example 1 obtained by the present invention, it can be seen that although the restorability is excellent, the impact buffering effect is significantly inferior.

Comparative Example 2 is a commercially available foamed polyethylene sheet with an expansion ratio of 30 times, and the hardness is almost the same as Examples 1 to 3 obtained by the present invention, but it has poor restoring force and poor impact cushioning. It can be said that the effect is just a step forward, and Comparative Example 3 is a vulcanized rubber sheet and has good restorability, but the impact buffering effect is thick (inferior, compared to Comparative Examples 2 to 3). It can be seen that a smooth sheet-like cross-sectional shape, such as the cross-sectional shape of No. 3, cannot be expected to have a sufficient shock-absorbing effect.

As described above, the present invention involves applying a liquid material that becomes a crosslinking viscoelastic material in a temperature range of 5°C to 80°C onto an embossed matrix surface placed on a conveyor line, and then causing a crosslinking reaction. By releasing the mold and winding it up, it is possible to continuously produce shock-absorbing sheets with complex shapes that exhibit excellent shock-absorbing effects, and the hardness is 5RIS-0101C, which was previously impossible to produce continuously. It is now possible to continuously produce a crosslinked viscoelastic material with a soft mold hardness of 50 or less, and the shape can be easily changed by changing the mother mold to be embossed, and the cost is lower than that of conventional press molding. Since continuous production using a conveyor has become possible from the production method, production costs can be reduced, and there are advantages in that it is possible to mass-produce shock-absorbing sheets with extremely excellent shock-absorbing effects. Furthermore, the shock-absorbing sheet obtained by the present invention can be used simply by pasting it on an impact-targeted object, and due to the material of the crosslinked viscoelastic body, it has additional effects such as moisture-proofing effect and heat-retaining effect. has great industrial utility value.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram illustrating a method for manufacturing an impact cushioning sheet according to an embodiment of the present invention. FIG. 2 is a perspective view of a conveyor heddle with concave embossing, which is an embodiment of the present invention. , FIG. 3 shows a shock absorber that has a convex cross-sectional shape and is integrated with a foam sheet, which is obtained by using the embossed matrix shown in FIG. 2, which is an embodiment of the present invention. FIG. 4 is a perspective view of a buffer sheet, and FIG. 4 is a perspective view of a conveyor belt with convex embossing, and FIG. 5 is a perspective view of a conveyor belt, which is an embodiment of the present invention. FIG. 6 is a perspective view of an impact cushioning sheet that has a concave cross-sectional shape and is integrated with a foam sheet, obtained by using an embossed matrix. The impact cushioning sheet obtained according to the present invention is directly attached to a cross-sectional view of a wood-based composite flooring and a 15QmmRc slab,
An explanatory diagram showing the pasting state for floor impact sound measurement, FIG. 7 is a diagram showing the floor impact sound measurement method described in FIG. 6, and FIG. 8 is a diagram showing examples 1 to 3 and comparative examples 1 to 3. 3 is a characteristic diagram showing the displacement amount and compressive load in comparison with No. 3. FIG. 1... Conveyor belt IA IB, IC, ID... Guide roll 2...
Embossed matrix 3 arranged on a conveyor belt...mixing agitator 4...coating machine 5...warming chamber 6...sheet laminating machine 7...anti-fouling sheet 4 7A. ... Anti-stick sheet reel 8 ... Crosslinked viscoelastic body 9 ... Sheet-like material 10 ... Winding machines 11A, 11B ... Feed roll 12 ... Pressure roll 13 ... Vibration point 14 -150mm RC slab I5...Wood composite flooring 16...Vibration chamber 17...Sound receiving chamber 18...Tapping machine 19...Microphone 20...Precision sound level meter■...Frequency analyzer 22...Recorder patent applicant Hayakawa Rubber Co., Ltd. Nimusha

Claims (1)

[Claims] 1. A convex or concave embossed matrix is placed on a conveyor belt, and a crosslinked viscoelastic body is formed on the matrix surface in a temperature range of 5°C to 80°C. After applying a liquid and causing a crosslinking reaction, the mold is released from the surface of the matrix to continuously obtain a sheet-like material having an uneven cross-sectional shape and excellent shock-absorbing effect. A method for manufacturing an impact cushioning sheet. 2. A patent claim characterized in that the convex or concave embossed matrix is in the form of a sheet made of polyethylene, polypropylene, or vulcanized rubber, and is affixed to a conveyor belt. A method for producing an impact cushioning sheet according to scope 1. 3. The convex or concave embossed matrix forms the conveyor belt itself, which is made of something like polyethylene, polypropylene, or vulcanized rubber; A method for manufacturing an impact cushioning sheet according to claim 1, wherein the impact cushioning sheet is 4. A convex or concave embossed matrix is connected to a conveyor belt in the form of caterpillars, and the caterpillars are made of metals such as aluminum, iron, stainless steel, or polymers such as polyethylene, polypropylene, vulcanized rubber, etc.
The method for producing an impact cushioning sheet according to claim 1, wherein the sheet is a composite material of metal and polymer. 5. The convex height or concave depth of the matrix embossed in a convex or concave shape is 10 mm or less, and the area ratio of the crosslinked viscoelastic body formed in the concave or convex shape to the space is 1 :9～
9:1, and the volume of one concave or convex shape is 0.05c
Claim 1 characterized in that c to 20 cc
The method for manufacturing the impact cushioning sheet described in Section 1. 6. A mother mold embossed in a convex or concave shape is placed on a conveyor belt, and a liquid material that forms a crosslinked viscoelastic material is applied to the surface of the mother mold in a temperature range of 5°C to 80°C to perform crosslinking. When reacting, non-woven fabric, split cloth, glass cloth, cheesecloth, paper,
Sheet-like materials such as vinyl chloride, polyethylene, EVA, CR, EPT, etc. or foamed sheet-like materials are laminated, and after cross-linking reaction, the mold is released from the mold surface and integrally molded, resulting in concave or convex impact cushioning. 2. The method for producing an impact cushioning sheet according to claim 1, wherein the sheet is obtained continuously. 7. 5 on the mother mold surface embossed in convex or concave shape
The liquid material, which becomes a crosslinked viscoelastic body in the temperature range from ℃ to 80℃, contains two isocyanate groups per molecule as a reactive group that reacts with the main ingredient, which is a telechelic polymer that has hydroxyl groups at both ends of the molecule, and the hydroxyl groups. A crosslinked viscoelastic body made of a crosslinking agent having the above as the main polymer component and crosslinked in a temperature range of 5°C to 80°C maintains its shape even when heated to 80°C, and maintains its shape at 20°C.
Hardness under the conditions of Japan Rubber Association standard SRIS-0101
The method for producing an impact cushioning sheet according to claim 1, characterized in that the hardness is 50 or less on a C-type hardness tester as defined in Claim 1.