How Is A Shoe Last Made? What Are The Characteristics?

Shoe last made in this way:

Foot length is formulated.

The foundation is also the basis for designing the last length of the shoe last, but no matter which structure, the shoe last and the bottom length must be larger than the foot length.

This is because the length of the foot is often affected by the climate and the intensity of labor.

The change of foot length caused by climate change is generally 3-5mm. When people are doing heavy physical labor or walking for a long time, they will also increase their feet.

When they are walking, the feet must have a certain margin of activity in their shoes, which is called "allowance", and the allowance for men's shoe last is usually 20mm, female.

It's 16.5m.

At the same time, the change of allowance is changed with the change of the shape of the last shape.

Generally, the smaller the head shape is, the larger the allowance is; the larger the head shape is, the smaller the allowance will be.

Third, the heel of the shoe last should be properly convex (after tolerance), so that it can be adjusted to the radian of the heel.

It is more fitting. The difference of the rear shoe tolerance of the general leather shoe last is about 2% of the girth. The average tolerance of the male head last is 5mm, and the rear tolerance of the female head shoe is 4.5mm.

Therefore, the relationship between the length of the last bottom and the length of the foot is the last bottom length = foot length + allowance - post tolerance.

For example, making a male leather shoe last with a 250mm length of feet, then the length of its last bottom is as follows: the length of the 250+20-5=265mm foot and the length of the last shoe: the girth is the basis of the weight and the weight of the shoe last is determined by the girth of the foot.

To determine the weight and weight of shoe last is mainly based on the two parts of the foot's metatarsal and tarsal circumference.

1. Plantar circumference: the foot metatarsal circumference is the key part of bending when walking. If the last metatarsal size is improper, it will not only wear uncomfortable, but also bring early damage to the metatarsal part of the shoe, which will affect human health.

The determination of the last metatarsal circumference is related not only to the plantar circumference, but also to the shoe.

Such as: 1. vegetarian head, three quarter first shoe's last metatarsal circumference should be smaller than 3.5mm of the foot metatarsal circumference, so that the plantar circumference of the shoe will be stuck to the plantar joint, and the toe will not be hurt until the foot pain is reached.

2. the shoes with a lack of control, such as shallow mouth, tongue type, and so on, are less than 7mm in the last metatarsal circumference.

3. boots, high waist, and back can have control shoes, the last metatarsal circumference can be equal to the foot metatarsal or slightly larger than the foot plantar circumference, especially the high waist cotton shoes need to add 3.5mm.

4. children are in the developmental stage. For the feet to grow normally, the last metatarsal circumference should be larger than the plantar circumference.

Two, tarsal circumference: the tarsal girth is generally 1mm larger than the plantar circumference in the foot pattern.

However, it can not be used to make the last 2-6mm..

At the same time, attention should be paid to picking up the back of the waist. The same length of the tarsal girth can create different degrees of tarsal circumference, and directly affect the shape of the last shape. Therefore, we must correctly consider the stilling of the tarsal circumference besides grasping the size of the tarsal girth.

The width of the foot and the width of the last: width refers to the width of each part of the shoe last.

The width of the last bottom is based on the width of the foot.

The width of the foot is two, the width is wide and the footprint is wide.

In fact, these two widths can not make a real bottom width.

In general, the width of the last bottom sample needs to be zoomed apart from the front and rear ends (allowance and tolerance). The rest points must take the 1/2 between the outline width and the footprint width as the last bottom width.

The stilt of shoe last: the stilt of last is the front and rear stilts of the last body.

The front stilt height and the rear stilt height of the last one are in harmony.

When the height of the last step is fixed, the distance from the front point to the horizontal level of the shoe last is called the front stilt height of the last. When the rear stilts of the last step rise, the front stilts of the last one will decrease. When the back of the last step is lowered, the front stilts will rise, but this is not a simple leverage.

From the general law, the last step of the female last step increased by 10mm, and the front stilts decreased by about 1mm. The last step of men's shoe last increased by 5mm and the front stilts decreased by about 1mm.

The base line of shoe last insole: the base line of the shoe last is mainly: the heel is 18% of the feet, the waist point is 41%, the fifth toe is 63.5%, the first metatarsophalangeal point is 72.5% of the foot length, the small toe outlying point accounts for 78% of the foot length, and the toe of the toe is 90% of the foot length.

Confirm the center line and the back arc of the last face. First, use the visual measurement to find the middle point of the crown of the head, the middle point of the cylinder, and find the midpoint at the most concave part of the last back.

Press the middle point of the head and the middle point of the cylinder to the table. The pencil is lying on the table. The pen point draws a straight line to the middle point of the center of the thick convex, the middle point of the concave part of the last back and the middle point of the cylinder, and is called the center line of the last face.

The middle point is found at the intersection of the rear arc edge and the bottom edge, and the middle point is found at the position of the rear arc point, and the three points are connected into a line, which is the center line of the rear arc.

The determination of the center line of the last face and the center line of the rear arc is the key to the correctness of the shoe sample. It is also the basis for determining the parts of the parts. If there are no two central lines, there is no criterion for the quality of the shoes.

The height of the back of the shoe is determined: the height of the back seam of the shoe is usually 1/4 (25%), but when the design is positioned, 23% of the foot length is enough.

Because the shoes already contain the thickness of the inner bottom, half inner bottom, side surface, main heel, and other materials, so the shoes and positioning should be two.

The back of the tongue type shoe is 25.5%-26% with a foot length, and the design position takes up 23%-24% of the foot.

Because the front tongue is long and short, there should be a difference in the height of the back seam, but the tongue shoe has no shoelace adjustment control, so the post seam height must be slightly higher than that of the M shoe.

The rear seam height of the shallow shoe occupies 26% of the foot length, and the design positioning takes up 24% of the foot length.

The upper part of the back band is covered with sponge, such as casual shoes and tourist shoes. The height of the seam is not affected by the above proportion, and it can be appropriately raised.

From the above data, the shorter the front group is, the higher the height of the gang will be.

The height of the seam should not be measured according to the length of the last bottom.

Because the allowance of shoe last is large, such as the value of the last sample, it will make the same shoe 25 shoes with different seam height.

This is obviously reasonable.

Determine the total length and front door location of the front support: the length of the front support, such as the location of the Baotou, the front, the front and the exit points, must be determined according to the percentage of the last floor length.

Taking account of the active parts of each joint of the foot type, the length of the front support can not exceed 66% of the last bottom length. If the value exceeds this value, the foot bending will be subjected to collision when walking.

The mouth door length generally refers to the opening position of the shoe, for example, the tongue type shoe door is fixed under the stripe, the interface between the front and the shoe tongue, and the tie strap is positioned in the position where the shoe ears are connected with the front part, and the mouth door positioning takes up 38%-44% of the long last sample (for example, if the mouth of the female shallow shoe is fixed at 26%-30%).

The length of the door should be taken into account if the shoe is worn out and the last one is convenient. If the door is too long, it will press the instep, and at the same time, it will be too shallow.