Common Issues with Rubber Soles and Their Causes

Summary Description:

While rubber soles certainly offer numerous advantages, they can also give rise to a variety of issues during use. Next, Linghui Plastics, a manufacturer of rubber soles, will walk you through the potential problems and their underlying causes.

While rubber soles certainly offer many advantages, they can also give rise to a variety of issues during use. Next, Linghui Plastics, a manufacturer of rubber soles, will walk you through some common problems and their underlying causes.

I. Frostbite

1. Definition: The surface of cured rubber exhibits a powdery or hazy residue that cannot be removed by wiping.

2. Cause:

Some chemicals in the formulation are used in amounts exceeding their specified limits.

The chemicals used in the formulation are of poor quality themselves;

Due to incomplete vulcanization, the rubber sole continues to undergo vulcanization.

When weighing chemicals, the accuracy is insufficient;

Uneven mixing;

It may also frost when the temperature and humidity are too high.

 

 

 

II. Exhaling Mist

1. Definition: The surface color of the rubber sole changes, affecting the brightness of the sole itself.

2. Cause:

It is caused by the reaction of ozone with moist, warm air on light-colored fillers.

It can’t be wiped off; burning it will make it disappear, but it will reappear after a while.

 

III. Color Bleeding

1. Definition: Refers to a situation where one color spreads onto a material of another color.

2. Cause:

The part thickness is inaccurate, and excess material tends to flow.

The vulcanization time is too long, increasing its flowability within the mold.

The formulation is too soft, which likewise increases the rubber’s flowability within the mold.

The color-separating groove of the mold is too shallow;

The material feed position is inaccurate.

 

IV. Rubber Not Fully Cured

1. Definition: Relatively soft, with poor elasticity and easy to tear, exhibiting very poor physical properties.

2. Cause:
Weighing was not performed in accordance with the standard;
Not thoroughly mixed during blending;
Too little bridging agent was added during mixing, or none was added at all.
Insufficient vulcanization time;
The vulcanization temperature is insufficient.

 

V. Physical properties do not meet the requirements

1. Definition: Primarily manifested as chemical and physical properties that fall short of the formulation’s specified requirements.

2. Cause:

Weighing is inaccurate;
Uneven mixing;
The chemical quality of the formulation is poor.
Rubber is underripe or overripe;
The procedure was not followed as prescribed.

 

6. Color bleeding on rubber soles

1. Cause:
The pigment weighing is inaccurate;
The pigment itself is of poor quality;
Insufficient mixing (insufficient time or inadequate number of mixing cycles);
The carbonization time and temperature are not standardized.