Shoes technology, shoe making process process technology, shoe production technology

Question 1: Why is it necessary to distinguish between inner and outer waists?

Because the inner and outer loins of the foot shape and the last shape are arranged differently, in order to meet the needs of wearing and visual effects, the inner and outer loins must be treated.

Question 2: What is the basis for the distinction between inner and outer waist?

Foot shape foundation, last body shape, upper-like structure, etc.

Question 3: What is the principle of distinguishing inner and outer waists?

1: High inside and low outside: the meat head of the inner loin is thicker, and the meat head of the outer loin is thinner, so the inner loin is higher than the outer loin. For example, the inner waist at the mouth of pumps is 2mm--3mm higher than the outer waist.
2: Inside front and outside back: Since the protruding point of the inner waist (the first metatarsal point) is in front of the protruding point of the outer waist (the fifth metatarsal point), the opening position, horizontal bars and other related parts should be in front of the inner waist Outer waist (rather front than back).
3: Inner straight and outer arc: The line of the inner waist is straighter than that of the outer waist. Like the shape of a shoe cover.
4: Narrow inside and wide outside: Generally, it means that the inner waist of the shoe cover is narrower than the corresponding part of the outer waist, and the specific amount of narrowing is related to the last body.

Question 4: What is the weight of the inner and outer waist?

1: Distinguish between the upper part of the foot:
(1) The front tip of the toe cap. The shape of the last is oblique head type, and the turning part of the inner waist head is 2mm--3mm ahead of the outer waist.
(2) The forefoot part is at the side of the foot. The inner waist is 2mm--3mm inward than the outer waist
(3) The waist fossa is at the side of the foot. The inner waist of the low-heel last is 3mm--5mm more than the outer waist; the inner waist of the middle-heel last is 5mm--7mm more than the outer waist; the inner waist of the high-heel last is 7mm--9mm more than the
outer
waist The waist is 2mm--4mm higher than the outer waist, the inner waist is 1mm--2mm ahead of the outer waist, and the difference between the inner waist of the tongue is less than 1mm--2mm. The data above is for reference only and should be determined according to the specific situation
.

Question 5: After stretching the upper, it is found that the width of the shoe cap is wider than the original width.

1: Judgment of the cause
(1) The toe cap lining is not pasted;
(2) The strength of the pasted toe cap lining is not enough;
(3) The two sides of the toe cap part (probably the sides of the circle model) are too tight
2. Solve the problem Solution:
(1) Add toe cap interlining to control the shape of the shoe cover (Note: When attaching toe toe interlining, only attach the toe part, do not exceed the most concave part of the last shape, otherwise the upper surface will not match the last); (2
) Choose a stronger toe cap interlining. If the interlining cannot be controlled, it is necessary to draw the shape of the toe cap narrower by 1mm--1.5mm in advance to offset the amount pulled out by the upper.
(3) Add support feet on both sides of the circle model.

Question 6: The center line of the shoe cover tongue is biased towards the outer waist and the inner waist tongue is behind.

1. Judgment of the cause:
(1) The shoe cover model has not been specially treated;
(2) The operation method of the upper is wrong.
2. Solutions:
(1) Refer to the method in "Special Treatment of Shoe Covers".
(2) Adjust the operation method of stretching.

Question 7: After the stretching is formed, there is a phenomenon of cracking at the opening of the heel arc

1. Judgment of the cause:
(1) The template is too tight;
(2) There is no insurance leather or a small piece of car at the joint of the heel arc.
2. Solutions:
(1) Appropriately loosen the model;
(2) Generally, a safety leather or a small piece of car is designed at the heel seam to play a reinforcing role and prevent the heel from breaking after being stretched.