Preparation method of boot sleeve applicable to boot-shaped squeezing roller
A production method and press roll technology, which is applied in the field of paper machine presses, can solve the problems of insufficient dehydration of press shoe covers, deterioration of surface smoothness, low drainage strength, etc., and achieve wet paper with good water performance, long service life and hardness. Effect
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Embodiment 1
[0022] The method for manufacturing a shoe cover for a shoe-shaped press roll comprises the following steps:
[0023] (1) Clean the surface of the boot cover forming mold, and spray a release agent on the boot cover forming mold;
[0024] (2) Evenly pour the underlying polyurethane (polyurethane) on the boot cover forming mold. The polyurethane is made of QT polyester polyurethane with a pouring thickness of 2mm. While pouring, the flame defoaming method is used to ensure that no bubbles are generated, and the polyurethane is pre-added with Polyurethane defoamer XD-770, the addition ratio is 0.3%wt, QT polyester polyurethane has a Shore hardness of 92-93 and a bending stiffness of 4.6 N / mm 2 , the swelling rate after soaking in tap water at 80 ℃ for 72 hours is 2.4%;
[0025] (3) Before the bottom polyurethane layer is fully cured, straighten the tensile reinforced Kevlar fiber yarn aramid 1414 along the transverse direction of the mold core, and add the yarn along the longit...
Embodiment 2
[0032] The manufacturing method of the shoe cover for this shoe-type press roll, its steps are basically consistent with embodiment 1, and its difference is:
[0033] In step (2), the pouring thickness is 1mm, and the addition ratio of polyurethane special defoamer is 0.1%wt;
[0034] In step (4), the pouring thickness is 1mm, and the addition ratio of polyurethane special defoamer is 0.1%wt;
[0035] In step (7), QVT type polyether polyurethane is used for pouring, and the number of pouring layers for the surface layer of polyurethane layer is 5 layers, and the thickness of each layer is 0.8mm. 0.1%wt of polyurethane special defoamer is added in advance, and the defoamer is XD- 770: Compound formula of DF-8205 / 879 volume ratio of 2:1;
[0036] The depth of the groove in step (8) is 1 mm, and the width is 0.7 mm.
Embodiment 3
[0038] The manufacturing method of the shoe cover for this shoe-type press roll, its steps are basically consistent with embodiment 1, and its difference is:
[0039] In step (2), the pouring thickness is 2.2mm, and the addition ratio of polyurethane special defoamer is 0.5%wt;
[0040] In step (4), the pouring thickness is 1.5mm, and the addition ratio of polyurethane special defoamer is 0.7%wt;
[0041] In step (7), QVT type polyether polyurethane is used for pouring, and the number of pouring layers of the surface polyurethane layer is 2 layers, each layer is 1.2mm thick, and 0.6%wt of polyurethane special defoamer is added in advance, and the defoamer adopts XD- 770: Compound formula of DF-8205 / 879 volume ratio of 1:1;
[0042] The depth of the groove in step (8) is 1.5 mm, and the width is 1.3 mm.
[0043] The boot covers for shoe press rolls obtained in the above three examples are used on the shoe press rolls of high-speed paper machines, and the produced paper is smo...
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