Perfect for roller coverings!
Fluoro resin heat-shrinkable tube that provides excellent durability.21GRCP

Features

GRC is a heat-shrinkable tube made from PFA and FEP fluoro resin, and has been developed for use as a roller covering.
By simply heat-shrinking GRC onto a roller surface, the roller inherits the highly-functional characteristics of fluoro resin.

  1. Electrical insulation
  2. Non-adhesive surface resists contamination
  3. Chemical resistance

Applications

  • Photocopiers and printers
  • Paper manufacturing and paper product manufacturing (paper and adhesive tape manufacturing machines)
  • Film and sheet processing machines (laminators, and magnetic tape manufacturing machines)
  • Textile and dyeing equipment (dyeing and resin processing equipment)
  • Printing machinery (high-speed offset rotary press and printing machines for business forms)
  • Insulation (electrical cables)
  • Industrial machinery (printed circuit board, semiconductor, and FPD related equipment)

Specifications

Item
Code		Inside dia.
(mm)
Before shrinkage		Inside dia.
(mm)
Aftrer shrinkage		Thickness
(mm)		Standard
length
(mm)		Special
length
(mm) Note1		Material
17P1916.50.512003600PFA
20P2118.50.512003600PFA
22P2419.50.512003600PFA
25P2621.50.512003600PFA
27P30240.512003600PFA
30P33270.512003600PFA
35P3628.50.512003600PFA
40P43350.512003600PFA
50P51400.51200/1800PFA
55P57490.51200PFA
60P63500.51200/18003600PFA
65P67540.51800PFA
70P71610.51800PFA
75P75610.51800PFA
80P81640.51800PFA
85P91740.51800PFA
95P98820.51800PFA
100P106850.51800/3600PFA
105P109860.51800PFA
115P117960.51800PFA
125P1271060.51800/3600PFA
130P1361070.51800/3600PFA
140P1441250.51800PFA
150P1541250.51800/3600PFA
160F1631310.53600FEP
170F1741330.53600FEP
180F1901630.54000FEP
200F2061640.54000FEP
215F2201660.54000FEP
230F2351850.54000FEP
240F2491870.54000FEP
250F2592060.54000FEP
265F2782450.54000FEP
280F2982460.54000FEP
300F3162470.54000FEP
Note1: Ordered long-size product might have die mark as a result of forming.
Please check at your side beforehand especially on the condition that surface accuracy is necessary.

NOTES

  • When making inquiries or placing an order, be sure to supply us with the accurate roller diameter and length so that we can select the optimum tube for your application.
  • Cut length is 400 mm or above, with a pitch of 100 mm. Any quantity of tube order is welcome.
  • Please store the tubing in a cool and dark location (30℃ or below). At higher temperatures, there is a possibility that the tube will shrink.
  • P indicates a PFA product, and F indicates a FEP product.
  • The inside diameter after shrinkage is the measurement made after heating to 200℃ for 10 minutes. It is not a guaranteed value.
  • If GRC is used in places where the temperature exceeds 100℃ or where the nip pressure is too high, there is a strong possibility that the GRC may slip or cause wrinkle. Consult Gunze regarding such cases.

How to Apply GF Tube

Construction Method

Illustration
  • Please use the heat gun on the market.
  • Please choose inside dia, which is nearly roller’s diameter. The length of GRC that is around 200mm longer than the length of roller is preferable.
  1. Spin the roll at constant speed
    【Step1】 Spin the roll at constant speed
  2. Heat gun’s direction is opposite direction to movement’s direction
    【Step2】 Heat gun's direction is opposite direction to movement's direction
  3. Shrinking the tube from one side, while spining roller
    【Step3】 Shrinking the tube from one side, while spining roller
  4. Turn up on both side
    【Step4】 Turn up on both side
POINT
  1. Spin the roll at constant speed.
  2. Shrink GRC from one side. The standard temperature of heat air is 150~200℃ at the surface of GRC.
  3. Heat rollgun’s direction is opposite direction to movement’s direction to prevent air bubble.
  • Please contact for construction technique of tube with large size dia. we prepare for the detail guidances about tube.
  • Please contact for installation.
VIDEO

FAQ

  1. Is it possible to borrow construction tools?
    Yes, you can rent from us. (※Only in Japan)
  2. We do not have confidence in the construction. Is it possible to ask Gunze to give us a construction?
    Yes, we could carry out construction guidance free of charge only once at the first time.
  3. Is it possible to give construction to an irregular (oval, square, triangle / stepped, arched) roll?
    Since the shrinkage ratio of the tube is low, conformability to the shape will be limited. Please ask us for details.
  4. Is there a limit to the material of rollers?
    Since there is a risk of thermal deformation, we do not recommend low heat resistance materials such as polyurethane foam.
  5. How to deal with the end of the roller?
    Please do not cut off the tube by the roller’s length. Leaving the tube slightly longer than the roller and then shrink to be smaller than the roller’s diameter.
  6. Is it possible to cut the tube easily by scissors?
    It can be cut off easily by scissors or cutter. However, please be careful to cut the tube along the longitudinal direction in order not to leave cut marks.
  7. Is it possible to wipe the tube with solvent?
    Yes, it is possible.
  8. Is it possible to use an adhesive or tape to connect the tube?
    No, it is impossible.
  9. Is it possible to repair the entrainment of air bubbles?
    It is not possible to repair completely. Please contact us for simple repair method.
  10. How about the endurance of tubes?
    It might be different depending on customer’s usage.
  11. Is it possible to bond tubes and rolls by adhesive processing?
    It is impossible in our company. We will introduce a professional.