JPH0248201A - Tyre of handtruck and its manufacture - Google Patents
Tyre of handtruck and its manufactureInfo
- Publication number
- JPH0248201A JPH0248201A JP63197563A JP19756388A JPH0248201A JP H0248201 A JPH0248201 A JP H0248201A JP 63197563 A JP63197563 A JP 63197563A JP 19756388 A JP19756388 A JP 19756388A JP H0248201 A JPH0248201 A JP H0248201A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- foaming
- rubber
- tyre
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 229920001971 elastomer Polymers 0.000 claims abstract description 28
- 239000005060 rubber Substances 0.000 claims abstract description 28
- 238000005187 foaming Methods 0.000 claims abstract description 20
- 230000002093 peripheral effect Effects 0.000 claims abstract description 5
- 239000006260 foam Substances 0.000 claims description 13
- 238000000137 annealing Methods 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- 239000004604 Blowing Agent Substances 0.000 claims description 5
- 238000004898 kneading Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 239000004088 foaming agent Substances 0.000 abstract description 6
- 238000005299 abrasion Methods 0.000 abstract description 5
- 229920003051 synthetic elastomer Polymers 0.000 abstract description 3
- 239000005061 synthetic rubber Substances 0.000 abstract description 3
- 244000043261 Hevea brasiliensis Species 0.000 abstract description 2
- 229920003052 natural elastomer Polymers 0.000 abstract description 2
- 229920001194 natural rubber Polymers 0.000 abstract description 2
- 150000002829 nitrogen Chemical class 0.000 abstract 1
- 239000007787 solid Substances 0.000 description 14
- 238000004073 vulcanization Methods 0.000 description 12
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004156 Azodicarbonamide Substances 0.000 description 2
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 2
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 2
- 235000019399 azodicarbonamide Nutrition 0.000 description 2
- 229920001821 foam rubber Polymers 0.000 description 2
- 235000021384 green leafy vegetables Nutrition 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Landscapes
- Tires In General (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Tyre Moulding (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はハンドトラック用タイヤ、即ち、手押し車等で
知られるハンドトラックのタイヤであり、内部に空気を
入れないソリッドタイプのタイヤ及びその製造方法に関
するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a tire for a hand truck, that is, a tire for a hand truck known as a hand truck, etc., and is a solid type tire that does not contain air inside, and its manufacture. It is about the method.
主として人力により、構内、屋内等で荷物を運搬するた
めに用いるハンドトラックは、その形によって平床形、
片そで形、両そで形、箱形、柵形、パケット形あるいは
てこ形等があり、車輪の数も１輪、２輪、３輪、４輪と
種々であるが、そのタイヤの構造はチューブ付き、チュ
ーブレスの様に内部に空気を封入するもの、又は、ソリ
ッド形のラバークツションタイプである。Hand trucks, which are mainly used to transport cargo within premises or indoors by human power, can be classified into flatbed type, flatbed type,
There are single-sleeved, double-sleeved, box-shaped, fence-shaped, packet-shaped, and lever-shaped tires, and the number of wheels varies from 1, 2, 3, and 4, but the structure of the tire These are tube-equipped, tubeless type with air sealed inside, or solid rubber cushion type.
第５〜７図は従来のハンドトラック用のソリッド形タイ
ヤの断面図である。5 to 7 are cross-sectional views of conventional solid type tires for hand trucks.
第５図はゴムを均質に成型したラバークツションタイヤ
であり、タイヤＡは均質なソリッドゴムで構成されてい
る、
第６図は２層構造のタイヤであり、中心部に発泡ゴム１
を有し、その外周にソリッドゴム２を被覆したものであ
り、ソリッドゴム２のビード部には通常ビードワイヤ３
が通される場合が多い。Figure 5 shows a rubber cushion tire made of homogeneously molded rubber. Tire A is made of homogeneous solid rubber. Figure 6 shows a tire with a two-layer structure, with one layer of foam rubber in the center.
The outer periphery of the solid rubber 2 is coated with a bead wire 3 at the bead of the solid rubber 2.
is often passed.
第７図は発泡プラスチックのタイヤであり、タイヤＡは
均質な発泡ＥＶＡ樹脂４で形成されている。FIG. 7 shows a tire made of foamed plastic, and tire A is made of homogeneous foamed EVA resin 4.
ハンドトラック用のタイヤは適度の弾力性、強度及び軽
量性が要求される。特にてこ形ハンドトラックは主とし
てコーラ、ジュース等のビンを並べたケースを車から降
ろし、各小売店に運び込む時に使用されるもので、この
てこ形ハンドトラックは車の荷台に乗せて現地まで運び
、そこで作業者が積み降ろし作業をすることになる。従
って強度も勿論要求されるが、作業能率を決定するのは
軽量化なのである。そしてハンドトラックの車体本体は
軽合金のパイプを使用することにより、最大限軽くなっ
ているが、２本のタイヤの軽量化が困難を極めている。Tires for hand trucks are required to have appropriate elasticity, strength, and light weight. In particular, lever-shaped hand trucks are mainly used to unload cases of bottles of coke, juice, etc. from cars and transport them to retail stores. There, workers will carry out loading and unloading work. Therefore, although strength is of course required, weight reduction is what determines work efficiency. Although the body of the hand truck is made as light as possible by using light alloy pipes, it is extremely difficult to reduce the weight of the two tires.
例えば、第５図に示した均質ゴムのソリッドタイプタイ
ヤはハンドトラック用としては２．５０−４サイズにす
わば約１．６ｋｇ／本の重さである。For example, the homogeneous rubber solid type tire shown in FIG. 5 has a size of 2.50-4 and weighs about 1.6 kg/tire for hand trucks.
一方、第６図に示した２層タイプのタイヤであれば１重
量は１層ソリッドタイプの約２／３で済む。On the other hand, in the case of a two-layer type tire shown in FIG. 6, the weight of one tire is approximately two-thirds of that of a one-layer solid type tire.
しかし製作行程が著しく複雑になり、製造コストが倍増
するばかりか、層間剥離が生じ、破損しやすい欠点があ
る。However, the manufacturing process becomes extremely complicated, the manufacturing cost doubles, and there are also drawbacks such as delamination and easy damage.
更に第７図の発泡ＥＶＡ樹脂にすれば重量はソリッドゴ
ムの１１５〜１／１０になる。しかしながら、ＥＶＡ樹
脂は反発弾性率がゴムに比べてはるかに小さいため、い
わゆるクツション性がなく。Furthermore, if the foamed EVA resin shown in FIG. 7 is used, the weight will be 115 to 1/10 that of solid rubber. However, since EVA resin has a much lower impact resilience than rubber, it lacks so-called cushioning properties.
積荷を安定して運ぶことができない。Unable to transport cargo stably.
従って、適度の反発弾性と耐摩耗強度を有し、且つ、ノ
ーパンクであり乍ら軽量化されたハンドトラック用タイ
ヤを作ることが当業界の課題であった・
〔課題を解決するための手段〕
上記課題を解決するため、本発明は次の手段をとるもの
である。Therefore, it has been a challenge for the industry to create a tire for hand trucks that has appropriate rebound resilience and abrasion resistance, is puncture-free, and is lightweight. [Means for solving the problem] In order to solve the above problems, the present invention takes the following measures.
即ち、本発明のハンドトラック用タイヤはタイヤ横断面
における周縁部に発泡倍率（体積比）が１．５以下のス
キン層と、中心部に発泡倍率が１゜５〜３．０の発泡層
とを有し、これら２層が連続して一体的にゴムで形成さ
れたことを特徴とするものであり、このスキン層は厚み
が１０Ｗｍ以下、硬度が４５〜５５（ＪＩＳＡ）である
ことが好ましく、発泡層は発泡倍率が１．８〜２，０、
硬度が３５〜４５（ＪＩＳＡ）であることが好ましい。That is, the hand truck tire of the present invention has a skin layer with a foaming ratio (volume ratio) of 1.5 or less at the peripheral edge in the cross section of the tire, and a foam layer with a foaming ratio of 1.5 to 3.0 in the center. The skin layer preferably has a thickness of 10 Wm or less and a hardness of 45 to 55 (JISA). , the foam layer has a foaming ratio of 1.8 to 2.0,
It is preferable that the hardness is 35 to 45 (JISA).
また、このハンドトラック用タイヤの製造方法としては
、ゴム１００重量部に対して窒素系発泡剤２〜１０重量
部を配合、混練り後、グリーンを成形し、これを金型に
入れて１４０〜１８０℃、２０〜６０分で加硫し、その
後５０〜９０℃、６〜４８時間アニーリングすることを
特徴とするものである。In addition, as a manufacturing method for this hand truck tire, 2 to 10 parts by weight of a nitrogen blowing agent are mixed with 100 parts by weight of rubber, and after kneading, a green is formed, and this is put into a mold for 140 to 100 parts by weight. It is characterized by vulcanization at 180°C for 20 to 60 minutes, followed by annealing at 50 to 90°C for 6 to 48 hours.
本発明におけるハンドトラック用タイヤはスキン層と発
泡層から成るが、この２層の境界は明確なものではなく
、連続して一体的に成形されている。スキン層は発泡倍
率が１．５以下であり、全く発泡していない場合もある
が１通常わずかに発泡している。スキン層の厚みは特に
限定されないが、１０ｍｍ以下が好ましい。スキン層は
発泡倍率が小さく、ソリッドゴムに近い性状を示し、硬
度はＪＩＳＡで４５〜５５が好ましい。The hand truck tire according to the present invention is composed of a skin layer and a foam layer, but the boundary between these two layers is not clear, and they are continuously molded integrally. The skin layer has an expansion ratio of 1.5 or less, and although it may not be foamed at all, it is usually slightly foamed. The thickness of the skin layer is not particularly limited, but is preferably 10 mm or less. The skin layer has a small expansion ratio, exhibits properties similar to solid rubber, and preferably has a hardness of 45 to 55 according to JISA.
一方、発泡層は中心からスキン層に至る部分であり、発
泡倍率が１．５〜３．０、好ましくは１゜８〜２．０で
ある。発泡層の硬度はＪＩＳＡで３５〜４５が好ましい
。On the other hand, the foam layer is a portion extending from the center to the skin layer, and has a foaming ratio of 1.5 to 3.0, preferably 1.8 to 2.0. The hardness of the foam layer is preferably 35 to 45 according to JISA.
スキン層はタイヤの摩耗を直接受ける所であり、発泡倍
率が１．５を越えると耐摩耗性が劣り、実用に耐えられ
なくなる。また硬度はＪＩＳＡで４５未満では柔軟すぎ
て安定性が悪く、また５５を越えると硬すぎてクツショ
ン性に欠け、凸部の乗越えが困難になる。The skin layer is directly exposed to tire abrasion, and if the expansion ratio exceeds 1.5, the abrasion resistance will be poor and it will not be practical. Also, if the hardness is less than 45 according to JISA, it will be too flexible and have poor stability, and if it exceeds 55, it will be too hard and lack cushioning properties, making it difficult to get over convex portions.
発泡層はタイヤにクツション性能を与える所であり、ま
た、この部分がタイヤの大部分の体積を占めるので直接
、重量に影響する所である。The foam layer provides cushioning performance to the tire, and since this layer occupies most of the volume of the tire, it directly affects the weight.
発泡層の発泡倍率が１．５未満では比重が太きく、軽量
化の効果が期待できず、３．０を越えると独立気泡自体
が大きくなり耐荷重性が劣ってくる。また硬度はＪＩＳ
Ａで３５未満では柔らかすぎてタイヤの形状安定性が悪
くなり、４５を越えると硬すぎてクツション性が悪くな
る。If the foaming ratio of the foam layer is less than 1.5, the specific gravity will be high and no weight reduction effect can be expected, and if it exceeds 3.0, the closed cells themselves will become large and the load bearing capacity will deteriorate. Also, the hardness is JIS
If A is less than 35, it will be too soft and the shape stability of the tire will deteriorate; if it exceeds 45, it will be too hard and the cushioning properties will deteriorate.
本発明のタイヤを製造するためには、ゴムと発泡剤の種
類、量、加硫条件、アニーリング条件を特定する必要が
あり、これらがバランスして初めて、本発明のタイヤが
得られる。In order to manufacture the tire of the present invention, it is necessary to specify the type and amount of rubber and foaming agent, vulcanization conditions, and annealing conditions, and the tire of the present invention can only be obtained when these are balanced.
本発明で用いられるゴムは天然ゴム、合成ゴムのいずれ
でもよく、合成ゴムとしてはＳＢＲ，ＢＲ，ＮＢＲ，Ｃ
ＲｌＩＩＲ等が用いられる。The rubber used in the present invention may be either natural rubber or synthetic rubber, and synthetic rubbers include SBR, BR, NBR, C
RlIIR etc. are used.
発泡剤は窒素系のもので、４，４′−オキシビスベンゼ
ンスルフォニルヒドラジド（ＯＢ Ｓ Ｈ）、ジニトロ
ソペンタメチレンテトラミン（ＤＰＴ）、アゾジカルボ
ンアミド（ＡＤＣＡ）、パラトルエンスルホニルヒドラ
ジド（ＴＳＨ）、あるいはアゾビスイソブチロニトリル
（Ａ Ｉ Ｂ Ｎ）等が好ましく用いられる。The blowing agent is nitrogen-based, such as 4,4'-oxybisbenzenesulfonylhydrazide (OBSH), dinitrosopentamethylenetetramine (DPT), azodicarbonamide (ADCA), paratoluenesulfonylhydrazide (TSH), or Azobisisobutyronitrile (AIBN) and the like are preferably used.
ゴムと発泡剤の配合割合はゴム１００重量部に対して発
泡剤２〜１０重量部であり、助剤を併用する場合には２
〜５重量部、単独の場合には５〜１０重量部が好ましい
。この他、ゴムには通常、カーボン、軟化剤、老化防止
剤等が添加され、コンパウンドにされる。The mixing ratio of rubber and foaming agent is 2 to 10 parts by weight of foaming agent per 100 parts by weight of rubber, and when an auxiliary agent is used together, 2 to 10 parts by weight of foaming agent is used.
~5 parts by weight, preferably 5 to 10 parts by weight when used alone. In addition, carbon, softeners, anti-aging agents, etc. are usually added to rubber to form a compound.
コンパウンドの混練りはインターミックス、バンバリー
ミキサ−、ニーダ−等の密閉型混合機あるいはオープン
ロールを用いて発泡剤の分解温度以下（通常８０℃以下
）で行なわれる。The compound is kneaded using a closed mixer such as an intermix, a Banbury mixer, or a kneader, or an open roll at a temperature below the decomposition temperature of the blowing agent (usually below 80°C).
混練りを終えたコンパウンドは熱入れ、シート出しをす
るか、あるいはコールドフィーダーを用いてグリーンを
成形する。After the compound has been kneaded, it is heated and formed into a sheet, or a cold feeder is used to form greens.
成形したグリーンは金型に入れて加硫を行なう。The molded green is placed in a mold and vulcanized.
加硫温度は１４０〜１８０℃、好ましくは１５０〜１７
０℃である。加硫時間は２０〜６０分、好ましくは３０
〜５０分である。この加硫条件は単なるゴムの加硫だけ
でなく、発泡の状況に影響を与える。つまり、加硫温度
が１４０℃未満、加硫時間が２０分未満の場合、発泡層
の発泡倍率が所定の値以上に上がってしまい、その結果
、硬度が軟らかくなりすぎる傾向にあり、また、加硫温
度が１８０℃を越え、加硫時間が６０分を越えると発泡
層の発泡倍率が所定の値以下になり、硬度が硬くなりす
ぎる傾向にある。Vulcanization temperature is 140-180°C, preferably 150-170°C
It is 0°C. Vulcanization time is 20-60 minutes, preferably 30 minutes
~50 minutes. These vulcanization conditions affect not only the mere vulcanization of the rubber but also the foaming state. In other words, if the vulcanization temperature is less than 140°C and the vulcanization time is less than 20 minutes, the foaming ratio of the foam layer will rise above a predetermined value, and as a result, the hardness will tend to become too soft. When the sulfur temperature exceeds 180° C. and the vulcanization time exceeds 60 minutes, the foaming ratio of the foamed layer becomes less than a predetermined value, and the hardness tends to become too hard.
加硫を終了した製品は寸法を安定させるためにアニーリ
ング処理を行なう。アニーリング温度は５０〜９０°Ｃ
１好ましくは６０〜８０℃、時間は６〜４８時間、好ま
しくは１２〜２４時間である。After vulcanization, the product is annealed to stabilize its dimensions. Annealing temperature is 50-90°C
1 Preferably, the temperature is 60 to 80°C, and the time is 6 to 48 hours, preferably 12 to 24 hours.
以下、実施例を示し、本発明を具体的に説明する。 EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples.
実施例１〜４
第１表に示すゴム１００部に添加剤を加えたコンパウン
ドに発泡剤をオープンロール、又はバンバリーミキサ−
で混練りし、熱入れ、シート呂しを行なってグリーンを
作成した。Examples 1 to 4 A foaming agent was added to a compound prepared by adding additives to 100 parts of the rubber shown in Table 1 using an open roll or a Banbury mixer.
The greens were prepared by kneading, heating, and sheet bathing.
このグリーンを直径（タイヤ外径）１８０＋＋ｅ厚さ（
タイヤ幅）４４ｍ＋の金型に入れて１５７℃。This green has a diameter (tire outer diameter) of 180++e thickness (
Tire width) 44m+ mold and heat to 157℃.
４０分間加硫し、その後７０℃、２０時間アニリングを
行なった。得られたタイヤの発泡倍率、硬度を測定し、
第１表に示した。Vulcanization was performed for 40 minutes, and then annealing was performed at 70° C. for 20 hours. Measure the expansion ratio and hardness of the obtained tire,
It is shown in Table 1.
また、タイヤ断面を第１図に示し、タイヤの全体斜視図
を第２図とし、このタイヤを装着させたてこ形ハンドト
ラックの斜視図を第３図として示した。Further, a cross section of the tire is shown in FIG. 1, an overall perspective view of the tire is shown in FIG. 2, and a perspective view of a lever-shaped hand truck equipped with this tire is shown in FIG. 3.
第１表
（重量部）
第１図においてスキン層５はタイヤの周縁部を構成して
おり、その中心に発泡層６があるが、スキン層５と発泡
層６は連続しており、その境界が線で明確化されている
わけではない。Table 1 (parts by weight) In Figure 1, the skin layer 5 constitutes the peripheral part of the tire, and the foam layer 6 is located at the center, but the skin layer 5 and the foam layer 6 are continuous, and the boundary between them is is not clearly defined by a line.
第２図においてタイヤＡは中心に車輪軸穴７を有するド
ーナツ状の発泡ゴムである。In FIG. 2, a tire A is a doughnut-shaped foam rubber having a wheel shaft hole 7 in the center.
第３図はてこ形ハンドトラックであり、金属パイプで作
られたトラック本体８に２輪のタイヤＡが装着されてい
る。FIG. 3 shows a lever-shaped hand truck, in which two tires A are mounted on a truck body 8 made of metal pipes.
実施例５、比較例１〜２
第１図に示した本発明のタイヤ（実施例５）、第５図に
示した均質ソリッドゴムからなるタイヤ（比較例１）及
び第６図に示した′発泡ゴムをソリッドゴムで被覆した
２層タイヤ（比較例２）について圧縮歪を測定し、その
結果を第４図のグラフに示した。Example 5, Comparative Examples 1 to 2 The tire of the present invention shown in FIG. 1 (Example 5), the tire made of homogeneous solid rubber shown in FIG. 5 (Comparative Example 1), and the tire shown in FIG. Compressive strain was measured for a two-layer tire (Comparative Example 2) in which foamed rubber was covered with solid rubber, and the results are shown in the graph of FIG.
本発明のハンドトラック用タイヤは次の効果を奏する。 The hand truck tire of the present invention has the following effects.
（１）中心部の発泡倍率が高く、周縁部は発泡倍率が低
いスキン層となっているため、軽量化、耐摩耗性向上、
反発弾性率向上が同時に達成される。(1) The foaming ratio is high in the center and the skin layer has a low foaming ratio on the periphery, which reduces weight, improves wear resistance,
At the same time, an improvement in rebound resilience is achieved.
（２）ゴムの量、発泡剤の量、加硫温度、時間、アニー
リング温度１時間をバランスさせることにより、−工程
で２層構造のタイヤを得ることができる。(2) By balancing the amount of rubber, the amount of blowing agent, the vulcanization temperature, time, and annealing temperature of 1 hour, a tire with a two-layer structure can be obtained in the step -.
第１図は本発明のタイヤの断面図、第２図は同斜視図、
第３図はてこ形ハンドトラックの斜視図、第４図は本発
明のタイヤの圧縮歪曲線、第５〜７図は従来のタイヤの
断面図であり、第５図はソリッドゴムタイプのタイヤ、
第６図は２層積層タイプのタイヤ、第７図は発泡樹脂の
タイヤを夫々示す。
Ａ・・・タイヤ、１・・・発泡ゴム、２・・・ソリッド
ゴム、３・・・ビードワイヤ、４・・発泡ＥＶＡ樹脂、
５・・・スキン層、６・・発泡層、７・・・車輪軸穴。
第４図
３０ （ｍｍ）
第３図
第２図
第１図FIG. 1 is a sectional view of the tire of the present invention, FIG. 2 is a perspective view thereof,
FIG. 3 is a perspective view of a lever-shaped hand truck, FIG. 4 is a compressive strain curve of the tire of the present invention, FIGS. 5 to 7 are cross-sectional views of conventional tires, and FIG. 5 is a solid rubber type tire.
FIG. 6 shows a two-layer laminated type tire, and FIG. 7 shows a foamed resin tire. A... Tire, 1... Foamed rubber, 2... Solid rubber, 3... Bead wire, 4... Foamed EVA resin,
5...Skin layer, 6...Foam layer, 7...Wheel shaft hole. Fig. 4 30 (mm) Fig. 3 Fig. 2 Fig. 1
Claims (3)
）が１．５以下のスキン層と、中心部に発泡倍率１．５
〜３．０の発泡層とを有し、該２層が連続して一体的に
形成されたゴム製のハンドトラック用タイヤ。(1) A skin layer with a foaming ratio (volume ratio) of 1.5 or less on the peripheral edge of the tire cross section, and a skin layer with a foaming ratio of 1.5 or less in the center
A rubber hand truck tire having a foam layer of ~3.0 and the two layers are continuously and integrally formed.
５（ＪＩＳＡ）、発泡層の発泡倍率が１．８〜２．０、
硬度が３５〜４５（ＪＩＳＡ）である請求項１記載のハ
ンドトラック用タイヤ。(2) Thickness of skin layer is 10mm or less, hardness is 45-5
5 (JISA), the foaming ratio of the foam layer is 1.8 to 2.0,
The hand truck tire according to claim 1, having a hardness of 35 to 45 (JISA).
重量部を配合、混練り後、グリーンを形成し、これを金
型に入れて１４０〜１８０℃、２０〜６０分で加硫し、
その後、５０〜９０℃、６〜４８時間アニーリングする
ことを特徴とする請求項１記載のハンドトラック用タイ
ヤの製造方法。(3) 2 to 10 parts of nitrogen blowing agent per 100 parts by weight of rubber
After blending and kneading parts by weight, a green is formed, which is placed in a mold and vulcanized at 140-180°C for 20-60 minutes.
2. The method of manufacturing a hand truck tire according to claim 1, further comprising annealing at 50 to 90[deg.] C. for 6 to 48 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63197563A JPH0248201A (en) | 1988-08-08 | 1988-08-08 | Tyre of handtruck and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63197563A JPH0248201A (en) | 1988-08-08 | 1988-08-08 | Tyre of handtruck and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0248201A true JPH0248201A (en) | 1990-02-19 |
Family
ID=16376583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63197563A Pending JPH0248201A (en) | 1988-08-08 | 1988-08-08 | Tyre of handtruck and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0248201A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011142521A1 (en) * | 2010-05-11 | 2011-11-17 | 화인케미칼 주식회사 | Method for manufacturing foam tires having non-uniform inner bubbles, and structure of the foam tire |
| EP3585143A4 (en) * | 2017-02-23 | 2021-01-13 | OMS Investments, Inc. | Dual rotor spreader system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51137205A (en) * | 1974-04-24 | 1976-11-27 | Goodyear Tire & Rubber | Flatness resisting tire |
-
1988
- 1988-08-08 JP JP63197563A patent/JPH0248201A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51137205A (en) * | 1974-04-24 | 1976-11-27 | Goodyear Tire & Rubber | Flatness resisting tire |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011142521A1 (en) * | 2010-05-11 | 2011-11-17 | 화인케미칼 주식회사 | Method for manufacturing foam tires having non-uniform inner bubbles, and structure of the foam tire |
| EP3585143A4 (en) * | 2017-02-23 | 2021-01-13 | OMS Investments, Inc. | Dual rotor spreader system |
| US11490561B2 (en) | 2017-02-23 | 2022-11-08 | Oms Investments, Inc. | Dual rotor spreader system |
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