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Blown Film Die for Improving Product Transverse Film Thickness Uniformity

A technology of uniform film thickness and die head, which is applied in the field of blown film die head, can solve the problems of uneven thickness of film products in the transverse direction, and achieve the effect of improving thickness uniformity and improving versatility

Active Publication Date: 2016-02-10
乐清市博尔塑胶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors of the present invention have found that by introducing a choke ring between the plane splitter section and the die lip section, and by adjusting the depth at which each part of the choke ring is embedded in the plastic melt, the flow at each position on the circumference of the die lip can be flexibly controlled; and basically It does not affect the flow of other parts on the circumference of the die lip, thus solving the problem of uneven thickness in the transverse direction of film products

Method used

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  • Blown Film Die for Improving Product Transverse Film Thickness Uniformity
  • Blown Film Die for Improving Product Transverse Film Thickness Uniformity
  • Blown Film Die for Improving Product Transverse Film Thickness Uniformity

Examples

Experimental program
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Effect test

Embodiment 1

[0027] as attached Figure 1-2As shown, the blown film die head described in this embodiment to improve the uniformity of film thickness in the transverse direction of the product includes a coaxially arranged annular die head body 10, an annular die mouth 20, a mold core 30 and a melt feeding part 40; the mold core 30 is set in the annular die opening 20, and a die lip gap 21 is formed between the annular die opening, and the die lip gap 21 includes axially extending to the The vertical section 22 of the bottom surface of the die core; and the die head main body 10 is arranged below the annular die opening 20 and the die core 30, and the die head main body 10 is positioned and fixed on the ring by a fixing device 15 On the shape die opening 20, and make between the lower surface of the mold core 30 and the upper surface of the die head body 10, a split gap 11 is formed; the upper surface of the die head body 10 is provided with four spiral grooves 12 , and along the directio...

Embodiment 2

[0029] In this embodiment, the plastic melt is fed from the side and discharged from the center. as attached image 3 As shown, the blown film die head comprises an annular die head body 50, an annular die mouth 60 and a mold core 70; , and a lip gap 61 is formed between the annular die opening 60; and the die head body 50 is arranged below the annular die opening 60, and the lower surface of the annular die opening 60 is in contact with the annular die opening 60 A splitter gap 51 is formed between the upper surfaces of the die main body 50, and as the radial distance from the upper surface of the die main body to the center of the circle gradually decreases, the upper surface of the die main body 50 and the lower surface of the annular die mouth The splitter gap 51 between the surfaces gradually becomes larger; the upper surface of the die head body 50 is provided with two or several helical grooves 52, and along the direction of rotation of the helical grooves, the helical...

Embodiment 3

[0031] In this embodiment, the polypropylene ethylene block copolymer film is prepared by the film blowing die described in Example 1, wherein the film blowing die described in conjunction with the film blowing machine and other equipment (such as melt pump, cooling air Ring) parameters are as follows:

[0032] Divider type: flat spiral, external processing customization

[0033] Number of spiral grooves: 4

[0034] Spiral groove starting radius: 33mm

[0035] Spiral groove end radius: 73mm

[0036] Depth of spiral groove starting point: 12.4mm

[0037] Gap at the top outside the starting point of the spiral groove: 0.6mm

[0038] Gap at the outer top of the end of the spiral groove: 1.6mm

[0039] Spiral groove width: 6.0mm

[0040] Angle difference between the start and end of the spiral groove: 270°

[0041] Choke ring features: evenly cut into 36 segments

[0042] The largest gap in the choke section: 1.6mm

[0043] Choke ring width: 12mm

[0044] Gap adjustment ...

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Abstract

The invention relates to a film blowing die head for improving the uniformity of film thickness in the transverse direction of a product, which belongs to the technical field of plastic processing. The splitter gap radially splits the flow and flows out axially through the die lip gap, and the choke ring is used to adjust the flow rate of the plastic melt entering the die lip gap from the splitter gap. The present invention can flexibly control the flow of each part on the circumference of the die lip by introducing a choke ring between the plane splitter section and the die lip section, and by adjusting the depth of each part of the choke ring embedded in the plastic melt; The flow of other parts on the lip circumference, thus solving the problem of uneven thickness in the transverse direction of the blown film film product.

Description

technical field [0001] The invention relates to the technical field of plastic processing equipment, more specifically, the invention relates to a blown film die head capable of improving the uniformity of film thickness in the transverse direction of a product. Background technique [0002] In the plastic blown film process, adding a melt metering pump between the extruder and the blown film die can effectively improve the longitudinal thickness uniformity of the film product, but how to improve the thickness uniformity of the film product has always been a technical problem. problem. Compared with the cast film process, although the investment in blown film process equipment is low, the production process produces less recycled material, and the product strength is high, but the poor thickness uniformity of the product often becomes the main obstacle to enter the high-end market. [0003] In the film-making process of casting method, after the plastic melt is divided hori...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/28B29C47/20B29C48/32
Inventor 林叶刚王永常郑元坝潘泽云
Owner 乐清市博尔塑胶有限公司
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